Keysight 81940A User Manual

Compact tunable laser source modules

Advertisement

Quick Links

A l l t e s t I n s t r u me n t s , I n c .
5 0 0 C e n t r a l A v e .
F a r mi n g d a l e , N J 0 7 7 2 7
P : ( 7 3 2 ) 9 1 9 - 3 3 3 9
F : ( 7 3 2 ) 9 1 9 - 3 3 3 2
a l l t e s t . n e t
s s a l e s @ a l l t e s t . n e t
T h e t e s t & me a s u r e me n t
e q u i p me n t y o u n e e d a t
t h e p r i c e y o u w a n t .
A l l t e s t c a r r i e s t h e w o r l d ' s l a r g e s t s e l e c t i o n o f
u s e d / r e f u r b i s h e d b e n c h t o p t e s t & me a s u r e me n t
e q u i p me n t a t 5 0 % t h e p r i c e o f n e w .
O O u r e q u i p me n t i s g u a r a n t e e d w o r k i n g , w a r r a n t i e d , a n d
a v a i l a b l e w i t h c e r t i f i e d c a l i b r a t i o n f r o m o u r i n - h o u s e s t a f f
o f t e c h n i c i a n s a n d e n g i n e e r s .
• 1 0 + f u l l t i me t e c h n i c i a n s w i t h o v e r 1 5 0 y e a r s o f
s p e c i a l i z a t i o n
• 9 0 d a y w a r r a n t y & 5 d a y r i g h t o f r e t u r n o n a l l
e q u i p me n t
• • 1 - 3 y e a r w a r r a n t i e s f o r n e w a n d
p r e mi u m- r e f u r b i s h e d e q u i p me n t
• E v e r y u n i t t e s t e d t o O E M s p e c i f i c a t i o n s
• S a t i s f a c t i o n g u a r a n t e e d
Y o u h a v e p l a n s , w e w i l l h e l p y o u a c h i e v e t h e m.
A n y p r o j e c t . A n y b u d g e t .
t
G e t a q u o t e t o d a y !
C C a l l ( 7 3 2 ) 9 1 9 - 3 3 3 9 o r e ma i l s a l e s @a l l t e s t . n e t .

Advertisement

Table of Contents
loading

Summary of Contents for Keysight 81940A

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 Keysight 81940A, 44A, 49A, 80A & 89A Compact Tunable Laser Source Modules User’s Guide...
  • Page 3 The license set forth in the EULA represents MERCHANTABILITY AND FITNESS FOR A the exclusive authority by which the U.S. PARTICULAR PURPOSE. KEYSIGHT SHALL government may use, modify, distribute, or Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 4: Table Of Contents

    What is a Tunable Laser Source? Installation Front Panels Front Panel Controls and Indicators Typical Use Models Optical Output Polarization Maintaining Fiber Angled and Straight Contact Connectors Signal Input and Output Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 5 Mode-hop free tunability Mode-hop free sweeping range Modulation extinction ratio Operating temperature and humidity Output isolation Polarization extinction ratio Power flatness versus wavelength Power linearity Power repeatability Power stability Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 6 Signal to total source spontaneous emission ratio Tuning time Wavelength range Wavelength repeatability Wavelength resolution Wavelength stability General Definitions Compact Tunable Laser Module Specifications Conditions Supplementary Performance Characteristics General Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 7 Wavelength Repeatability Power Tests Maximum Output Power Power Linearity Power Flatness versus Wavelength Power Stability Signal-to-Source Spontaneous Emission Ratio Optional Performance Tests Signal-to-Total-Source Spontaneous Emission Ratio Test Records Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 8 Preserving Connectors How to clean connector interfaces How to clean bare fiber adapters How to clean instruments with a fixed connector interface Additional Cleaning Information Other Cleaning Hints Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 10: Getting Started

    Keysight 81940A, 44A, 49A, 80A & 89A Compact Tunable Laser Source Modules User’s Guide Getting Started This chapter provides a general description of Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family. Safety Considerations / 10 Initial Safety Information for Tunable Laser Modules...
  • Page 11: Safety Considerations

    If the contents are incomplete, mechanical damage or defect is apparent, or if an instrument does not pass the operator’s checks, notify the nearest Keysight Technologies Sales/Service Office. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 12: Line Power Requirements

    Input/Output Signals There is one BNC input connector on the front panel of a Keysight CAUTION 81980A, 81940A, 81944A, 81989A or 81949A Compact Tunable Laser Source module.
  • Page 13: Storage And Shipment

    Laser Source module can be stored or shipped at temperatures between - 40°C and + 70°C. Protect the module from temperature extremes that may cause condensation within it. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 14: Initial Safety Information For Tunable Laser Modules

    * Max. CW output power is defined as the highest possible optical power that the laser source can produce at its output connector. ** Max. permissible CW output power is the highest optical power that is permitted within the appropriate laser class Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 15: Laser Safety Labels

    • Refer servicing only to qualified and authorized personnel. The built in laser diode is active whenever the instrument is powered on, CAUTION therefore disabling the output is not sufficient to establish eye safe conditions. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 16 Getting Started The remote interlock function interrupts the laser current when the NOTE connector is open. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 17: Introduction

    DWDM components, and complete DWDM systems. Installation The Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Familys are front-loadable modules. For a description of how to install your module, refer to “How to Fit and Remove Modules”...
  • Page 18 Getting Started Figure 3 Keysight 81940A Compact Tunable Laser Modules Figure 4 Keysight 81989A Compact Tunable Laser Modules Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 19: Front Panel Controls And Indicators

    The built-in laser diode is active whenever the instrument is powered on, CAUTION therefore disabling the output is not sufficient to establish eye safe conditions. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 20: Typical Use Models

    In the S and C-bands with the high power in C-band (81980A and 81989A), or • In the C and L-bands with the high power in the L-band (81940A, 81944A and 81949A). Their compact single-slot format makes them a flexible and cost-effective stimulus for single channel and multichannel DWDM applications.
  • Page 21 All 819xxA modules can be operated in the stepped mode, usually used where measurements are done at particular wavelength. The 81980A, 81940A and 81944A can also be operated in the continuous sweep mode with dynamic wavelength logging to make measurements during the wavelength sweep.
  • Page 22: Optical Output

    Angled contact connectors help you to control return loss, since reflected light tends to reflect into the cladding, reducing the amount of light that reflects back to the source. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 23 Angled non-contact fiber end connectors with orange sleeves cannot be NOTE directly connected to the instrument. Connector Interfaces on page 28 for further details on connector interfaces and accessories. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 24: Signal Input And Output

    Getting Started Signal Input and Output There is one BNC input connector on the front panel of Keysight 81940A, CAUTION 44A, 49A, 80A & 89A Tunable Laser Source Families. An absolute maximum of ± 6 V can be applied as an external voltage to any BNC connector.
  • Page 26: Accessories

    Compact Tunable Laser Source Modules User’s Guide Accessories The Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family are available in various configurations for the best possible match to the most common applications. This chapter provides information on the available options and accessories.
  • Page 27: Modules And Options

    Modules and Options Figure 8 on page -26 shows all the options that are available for Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family, and the instruments that support these modules. Figure 8 Mainframes, Tunable Laser Modules and Options...
  • Page 28: Modules

    Accessories Modules Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family can be hosted by: • 8163A and 8163B Lightwave Multimeters, • 8164A and 8164B Lightwave Measurement Systems, • 8166A and 8166B Lightwave Multichannel Systems. Table 2 Compact Tunable Laser Modules...
  • Page 29: Connector Interfaces

    FC/APC or DIN 4108.6/4108.6) to connect to the instrument, you must do the following: Attach your connector interface to the interface adapter. Table 3 on page 28 for a list of the available connector interfaces. Connect your cable. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 30 Table 4 Angled Contact Connector Interfaces Description Model Number E-2000 APC Keysight 81000 HI SC/APC Keysight 81000 KI FC/APC Keysight 81000 NI DIN 47256 / 4108.6 Keysight 81000 SI Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 31: User's Guides

    8163A/B Lightwave Multimeter, 8164A/B Lightwave 08164-90B16 Measurement System, & 8166A/B Lightwave Multichannel System User’s Guide. 8163A/B Lightwave Multimeter, 8164A/B Lightwave 08164-90B65 Measurement System, & 8166A/B Lightwave Multichannel System Programming Guide. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 32: Specifications

    Compact Tunable Laser Source Modules User’s Guide Specifications Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family are produced to the ISO 9001 international quality system standard as part of Keysight’s commitment to continually increasing customer satisfaction through improved quality control.
  • Page 33: Definition Of Terms

    Cond itions: Modulation input signal and duty cycle as specified, modulation frequency as specified. Measurement: Using a photo receiver (of sufficient bandwidth) and an oscilloscope Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 34: External Analog Modulation-Modulation Depth

    Rise time specifies the time for the optical pulse to rise from 10% to 90% of its final power value. Cond itions: Modulation frequency as specified. Measurement: Using a photo receiver (of sufficient bandwidth) and an oscilloscope. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 35: Linewidth

    10 kHz, sweep time 20 ms, single scan). Maximum output power The maximum achievable output power of the tunable laser source and the maximum output power for which the tunable laser source specifications apply. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 36: Maximum Sweep Speed

    As specified. Measurement: Using a power meter at the end of a single-mode fiber patchcord. Maximum sweep speed The maximum selectable sweep speed in Continuous sweep mode on page Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 37: Mode-Hop Free Tunability

    The ambient temperature range and humidity range of the tunable laser source for which the specifications apply. If the optical mainframe hosting the tunable laser source module is NOTE rack-mounted the temperature and humidity within the rack apply. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 38: Output Isolation

    Using a polarization analyzer at the end of a polarization-maintaining patchcord, by sweeping the wavelength to create circular traces on the Poincaré sphere. Calculate the polarization extinction ratio from the diameters of these circles. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 39: Power Flatness Versus Wavelength

    Figure 11 Power flatness vs. wavelength Cond itions: Uninterrupted tunable laser source output power, constant power setting, constant temperature. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 40: Power Linearity

    Uninterrupted tunable laser source output power, constant wavelength setting, constant temperature. The long-term power repeatability can be obtained by taking the power NOTE repeatability and power stability into account. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 41: Power Stability

    B, and the square of the average optical power Pavg. RIN, if expressed as “dB/Hz”, is calculated by: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 42 ± half the span between the maximum and the minimum value of all differences. Figure 14 Relative wavelength accuracy Cond itions: Uninterrupted tunable laser source output power, constant power setting, constant temperature. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 43 NOTE Side-mode suppression ratio The ratio of optical power in the main mode to the optical power of the highest sidemode, expressed in dB: Cond itions: As specified. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 44 Measurement: Using an optical spectrum analyzer at 0.5 nm resolution bandwidth (to address the possibility of higher SSE within a narrower bandwidth), then extrapolated to 1 nm bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 45 Tuning distance as specified. The time is measured from sending the command to the TLS until the tuning operation has finished. Wavelength range The range of wavelengths for which the specifications apply (if not otherwise specified). Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 46 The dynamic specifications describe the behavior of the instrument in Continuous sweep mode on page 46. Static conditions The static specifications describe the behavior of the instrument in Stepped mode on page 46. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 47 (given by start wavelength, end wavelength and sweep speed). During a continuous sweep the dynamic specifications and the “Logged wavelength” (see above) applies. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 48 Supplementary performance characteristics: Describe the module’s non-warranted typical performance. Because of the modular nature of the instrument, these performance specifications apply to these modules rather than the mainframe unit. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 49 75 mm x 32 mm x 335 mm Weight 1. At day of calibration. 3. Value for 1 nm resolution bandwidth. 4. At constant temperature ± 0.5 K. 5. Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 50 75 mm x 64 mm x 335 mm Weight 1.8 kg At day of calibration. At maximum output power as specified. Value for 1 nm resolution bandwidth. At const. temperature ±0.5 K. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 51 75 mm x 32 mm x 335 mm Weight 1. At day of calibration. 3. Value for 1 nm resolution bandwidth. 4. At constant temperature ± 0.5 K. 5. Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 52 75 mm x 32 mm x 335 mm Weight 2. Value for 1 nm resolution bandwidth. 3. At constant temperature ± 0.5 K. 4. Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 53 75 mm x 32 mm x 335 mm Weight 2. Value for 1 nm resolution bandwidth. 3. At constant temperature ± 0.5 K. 4. Value for 0.1 nm resolution bandwidth. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 54 > 45% duty cycle, fall time <300 ns, 200 Hz to 1 MHz Modulation input (mainframe): TTL signal External analog modulation 15% modulation depth, ≥ 5 kHz to 1 MHz Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 55 Continuous Sweep Mode (Keysight 81980A, 81940A and 81944A) Mode-hop free sweeping: Full wavelength range at flat output power +10 dBm ≥ ° ° Ambient temperature within + 20 C and +30 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 56 , straight contact output connector. Option 072: , angled contact output connector. Connector Interface: One Keysight 81000xI-series connector interface is required. Does not apply to 81944A. 81944A: Standard SMF fiber used. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 58 Compact Tunable Laser Source Modules User’s Guide Performance Tests The procedures in this chapter test the optical performance of Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family. The complete specifications to which each module is tested are given in Chapter Specifications.
  • Page 59 You can use the HP 71452B or HP 71450A #100 instead of the 86142B. You can use the Keysight 86120B or 86122C Wavemeter instead of the Keysight 86120C. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 60 Always ensure that you use the correct cables and adapters, and that all connectors are undamaged and extremely clean. If a Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family fails any performance test, return it to the nearest Keysight Technologies Sales/Service Office for repair.
  • Page 61 • Zeroing takes approximately 2 minutes. Connect the Compact Tunable Laser Source module to the Wavelength Meter as shown in Figure 17 on page -60. Figure 17 Test Setup for Wavelength Tests Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 62 Set the Wavelength meter: • Set Display to Wavelength, • Set Med ium to Vacuum, • Set Resolution to Auto, • Set Averaging to On, • Set Input Attenuation to Auto. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 63 1 nm, the actual wavelength should change by 1 nm. To test for deviations from this ideal, the tunable laser source is set to various wavelengths, and the actual wavelength is measured using a wavelength meter. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 64 Attenuate the Power Output from the TLS Reduce the output power NOTE delivered by the TLS to a level compatible with the capabilities of the wavelength meter. Use the TLS module’s built-in attenuator, or an external attenuator. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 65 Set the TLS module to the next wavelength given in the Test record. Repeat step 6 step 7 to the maximum wavelength value for the TLS module: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 66 13 Determine, and note in the Test Record, the Absolute Wavelength Accuracy, which is the largest deviation (of either the Smallest Minimum Deviation or the Largest Maximum Deviation). Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 67 As a result, a mode-hop is generally not possible. The previous tests of absolute and relative wavelength accuracy have proved the functionality and performance of the built-in wavelength meter. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 68 Attenuate the Power Output from the TLS Reduce the output power NOTE delivered by the TLS to a level compatible with the capabilities of the wavelength meter. Use the TLS module’s built-in attenuator, or an external attenuator. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 69 Test Record, this is given in the “from wavelength” column. Set the wavelength of your compact TLS module back to the reference wavelength and wait until the wavelength meter has settled. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 70 11 From all wavelength measurements, pick the largest measured value and the smallest measured value. 12 Calculate the wavelength repeatability by subtracting the smallest measured value from the largest measured value. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 71 To an output power larger than the specified output power, • Such that any modulation is off. At the end of the test, the TLS is set to its maximum specified wavelength. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 72 <Power Unit> <dBm> <Power Mode> <Automatic> Modulation: <mod src> <Off> Connect the fiber to the optical output. Set the initial wavelength and power of the compact TLS to: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 73 The 81944A has an integrated building block which modulates the output power versus wavelength and temperature. Even very small changes would vary the output power randomly. This function is required for use in Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 74 <Power Unit> <dBm> <Power Mode> <Automatic> Modulation: <mod src> <Off> Connect the fiber to the optical output. Set the initial wavelength and power of the compact TLS to: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 75 , the output wavelength, of the compact TLS module to the λ next value given in the Test Record. 15 Repeat step 7 step 14 for the full wavelength range. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 76 Output power is decremented in 1 dB steps. At the end of the test, the compact TLS is set to its minimum output power. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 77 Keysight 81980A 1550.000 nm + 13.00 dBm Keysight 81989A 1550.000 nm + 13.00 dBm Keysight 81940A 1590.000 nm + 13.00 dBm Keysight 81949A 1590.000 nm + 13.00 dBm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 78 “Minimum Power Linearity at current setting”, respectively. 15 Subtract the minimum power linearity value from the maximum power linearity value and record the result as the Total Power Linearity. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 79 At a fixed power level, the wavelength is tuned over a given wavelength span. At each wavelength, the power is measured. Ideally, all power levels would be identical. Any deviation is expressed as power flatness. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 80 At the end of the test, the TLS is set to its maximum specified wavelength. Test Procedure Set up the equipment as shown in Figure 27 on page -79: Figure 27 Test Setup for Power Linearity Tests Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 81 At the 81626B, select <Menu> then <Disp Ref> Increase , the output wavelength, of the compact TLS module and of λ the power meter to the next value listed in the Test Record. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 82 At the start of the test, the compact TLS is set: • To any wavelength within its specified wavelength range, • To any power specified for the compact TLS at this wavelength. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 83 Values <Wavelength Mode> <λ> <Source State> <Off> <Power Unit> <dBm> <Power Mode> <Automatic> Modulation: <mod src> <Off> Set the initial wavelength and power of the compact TLS to: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 84 12 From the Statistics window, note the following results in the Test Record: • The “max” value as the Maximum Deviation, • The “min” value as the Minimum Deviation, Δ • The “ P” value as the Power Stability. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 85 OSA, then the measurement result is extrapolated for a bandwidth resolution of 1 nm (a factor of 2 relates to 3 dB). This value is recorded as the test result. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 86 <Source State> <Off> <Power Unit> <dBm> <Power Mode> <Automatic> Modulation: <mod src> <Off> Make sure the optical output is switched off. Set the wavelength of the compact TLS to: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 87 = 55.5 dB - 3 d B = 52.5 dB. 10 At the OSA, set the marker to the highest peak then select delta. → → [Marker] [Highest Peak] [Delta] Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 88 12 Increase the wavelength of the compact TLS by 10 nm, as listed in the Test Record. 13 Repeat step 10 step 12 for all wavelength settings listed in the Test Record. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 89 SSE based on the last sample on the left, at -3 nm, and the first sample on the right, at +3 nm. Figure 32 Total SSE Measurement Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 90 1550.000 nm + 13.00 dBm Keysight 81940A 1590.000 nm + 13.00 dBm 81944A 1590.000 nm + 10.00 dBm Keysight 81949A 1590.000 nm + 13.00 dBm Set the OSA: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 91 Wavelength, Relative to OSA_ _center Partial Noise Power Levels -15 nm -14 nm -13 nm -4 nm no value -3 nm no value -2 nm no value -1 nm no value Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 92 11 Determine the Total SSE power, power_total_SSE, λ Add the values of OSA_noise and SSE_power_ TLS_max: λ power_total_SSE = OSA_noise + SSE_power_ TLS_max = ___________ 10 W = ___________ pW. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 93 This ensures that the equation in delivers the Total SSE in step 12 decibels dB. 13 Note the result in the Test Record: Total SSE = _____________________ dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 94 Performance Tests Test Records This section contains Test Records for Keysight 81940A, 44A, 49A, 80A & 89A Tunable Laser Source Family. Results of the performance test may be tabulated on the Test Records. It is recommended that you fill out the Test Record and refer to it while executing the test.
  • Page 95 Report No.: Date: Customer: Tested By: Model: Keysight 81980A Compact Tunable Laser Source module Serial No. Ambient temperature °C Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 96 Model: Keysight 81980A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. d ue date Standard Optical Head Optical Spectrum Analyzer Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 97 1540.000 nm 1555.000 nm 1565.000 nm 1575.000 nm Within full tuning range 1465 nm - 1575 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 98 Absolute Wavelength Accuracy Resul t Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy Test Limit ±0.02 Measurement Uncertainty: ±0.6 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 99 ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.005nm Performance Characteristic 0.002nm typical Measurement Uncertainty: ±0.1pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 100 +10.00dBm 1525.000nm __________ dBm +13.00dBm 1535.000nm __________ dBm +13.00dBm 1545.000nm __________ dBm +13.00dBm 1555.000nm __________ dBm +13.00dBm 1565.000nm __________ dBm +13.00dBm 1475.000nm __________ dBm +13.00dBm Measurement Uncertainty: ±4.5% Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 101 Maximum Power Linearity at current setting ________ dB Total Power Linearity at current setting ________ dBpp (= Maximum Power Linearity - Minimum Power Linearity) Upper Test Limit 0.2 dBpp Measurement Uncertainty ±0.04 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 102 Upper Test Limit: 0.60 dBpp Performance Characteristic: dBpp Wavelength Range (1525nm - 1575nm) Maximum deviation: Minimum deviation: Flatness = Maximum - Minimum deviation: Upper Test Limit: 0.40 dBpp Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 103 Performance Tests Keysight Compact Tunable Laser Source mod ule Performance Test Page 8 of 10 Performance Characteristic: dBpp Measurement Uncertainty: ±2.6% Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 104 48dB 1550.000nm +13.00dBm _______dB 48dB 1555.000nm +13.00dBm _______dB 48dB 1560.000nm +13.00dBm _______dB 48dB 1565.000nm +13.00dBm _______dB 48dB 1570.000nm +13.00dBm _______dB 48dB 1575.000nm +13.00dBm _______dB 48dB Measurement Uncertainty: ±0.20dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 105 OSA noise ________pW SSE_power_lTLS_max ________pW Power_total_SSE = OSA_noise +SSE_power_lTLS_max ________pW Measurement Result = Total SSE (use formula below) ________pW Lower Test Limit 22dB Performance Characteristic 25dBtypical Measurement Uncertainty: ±2.0dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 106 Report No.: Date: Customer: Tested By: Model: Keysight 81940A Compact Tunable Laser Source module Serial No. Ambient temperature °C Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 107 Page 2 of 10 Model: Keysight 81940A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. due date Standard Optical Head Optical Spectrum Analyzer Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 108 1595.000 nm 1610.000 nm 1620.000 nm 1630.000 nm Within full tuning range 1520 nm - 1630 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 109 Absolute Wavelength Accuracy Resul t Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy Test Limit ±0.02 Measurement Uncertainty: ±0.6 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 110 ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.005nm Performance Characteristic 0.002nm typical Measurement Uncertainty: ±0.1pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 111 +13.00dBm 1580.000nm __________ dBm +13.00dBm 1590.000nm __________ dBm +13.00dBm 1600.000nm __________ dBm +13.00dBm 1610.000nm __________ dBm +13.00dBm 1620.000nm __________ dBm +13.00dBm 1630.000nm __________ dBm +10.00dBm Measurement Uncertainty: ±4.5% Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 112 Maximum Power Linearity at current setting ________ dB Total Power Linearity at current setting ________ dBpp (= Maximum Power Linearity - Minimum Power Linearity) Upper Test Limit 0.2 dBpp Measurement Uncertainty ±0.04 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 113 Upper Test Limit: 0.60 dBpp Performance Characteristic: dBpp Wavelength Range (1570nm - 1620nm) Maximum deviation: Minimum deviation: Flatness = Maximum - Minimum deviation: Upper Test Limit: 0.40 dBpp Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 114 Performance Tests Keysight Compact Tunable Laser Source module Performance Test Page 8 of 10 Performance Characteristic: dBpp Measurement Uncertainty: ±2.6% Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 115 48dB 1605.000nm +13.00dBm _______dB 48dB 1610.000nm +13.00dBm _______dB 48dB 1615.000nm +13.00dBm _______dB 48dB 1620.000nm +13.00dBm _______dB 48dB 1625.000nm +10.00dBm _______dB 45dB 1630.000nm +10.00dBm _______dB 45dB Measurement Uncertainty: ±0.20dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 116 OSA noise ________pW SSE_power_lTLS_max ________pW Power_total_SSE = OSA_noise +SSE_power_lTLS_max ________pW Measurement Result = Total SSE (use formula below) ________pW Lower Test Limit 22dB Performance Characteristic 25dBtypical Measurement Uncertainty: ±2.0dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 117 Report No.: Date: Customer: Tested By: Model: 81944A Compact Tunable Laser Source mod ule Serial No. Ambient temperature °C Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 118 Page 2 of 7 Model: 81944A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. due date Standard Optical Head Optical Spectrum Analyzer Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 119 1580.000 nm 1595.000 nm 1610.000 nm 1620.000 nm Within full tuning range 1525 nm - 1620 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 120 Absolute Wavelength Accuracy Resul t Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy Test Limit ±0.02 Measurement Uncertainty: ±0.6 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 121 ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.005nm Performance Characteristic 0.002nm typical Measurement Uncertainty: ±0.1pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 122 __________ dBm __________ dBm __________ dBm +10.00dBm __________ dBpp 1.5 dBpp Measurement Uncertainty: ±4.5% Mean Maximum Output Power = (Measured Maximum Power + Measured Minimum Power) / 2 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 123 OSA noise ________pW SSE_power_lTLS_max ________pW Power_total_SSE = OSA_noise +SSE_power_lTLS_max ________pW Measurement Result = Total SSE (use formula below) ________pW Lower Test Limit 20dB Performance Characteristic 25dBtypical Measurement Uncertainty: ±2.0dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 124 Report No.: Date: Customer: Tested By: Model: Keysight 81989A Compact Tunable Laser Source mod ule Serial No. Ambient temperature °C Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 125 Page 2 of 10 Model: Keysight 81989A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. due date Standard Optical Head Optical Spectrum Analyzer Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 126 1540.000 nm 1555.000 nm 1565.000 nm 1575.000 nm Within full tuning range 1465 nm - 1575 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 127 Absolute Wavelength Accuracy Result Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy Test Limit ±0.1 Measurement Uncertainty: ±0.6 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 128 ________ nm smallest measured wavelength ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.01nm Measurement Uncertainty: ±0.1pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 129 +10.00dBm 1525.000nm __________ dBm +13.00dBm 1535.000nm __________ dBm +13.00dBm 1545.000nm __________ dBm +13.00dBm 1555.000nm __________ dBm +13.00dBm 1565.000nm __________ dBm +13.00dBm 1475.000nm __________ dBm +13.00dBm Measurement Uncertainty: ±4.5% Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 130 Maximum Power Linearity at current setting ________ dB Total Power Linearity at current setting ________ dBpp (= Maximum Power Linearity - Minimum Power Linearity) Upper Test Limit 0.2 dBpp Measurement Uncertainty ±0.04 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 131 Upper Test Limit: 0.60 dBpp Performance Characteristic: dBpp Wavelength Range (1525nm - 1575nm) Maximum deviation: Minimum deviation: Flatness = Maximum - Minimum deviation: Upper Test Limit: 0.40 dBpp Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 132 Performance Tests Keysight Compact Tunable Laser Source mod ule Performance Test Page 8 of 10 Performance Characteristic: dBpp Measurement Uncertainty: ±2.6% Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 133 48dB 1550.000nm +13.00dBm _______dB 48dB 1555.000nm +13.00dBm _______dB 48dB 1560.000nm +13.00dBm _______dB 48dB 1565.000nm +13.00dBm _______dB 48dB 1570.000nm +13.00dBm _______dB 48dB 1575.000nm +13.00dBm _______dB 48dB Measurement Uncertainty: ±0.20dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 134 OSA noise ________pW SSE_power_lTLS_max ________pW Power_total_SSE = OSA_noise +SSE_power_lTLS_max ________pW Measurement Result = Total SSE (use formula below) ________pW Lower Test Limit 22dB Performance Characteristic 25dBtypical Measurement Uncertainty: ±2.0dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 135 Report No.: Date: Customer: Tested By: Model: Keysight 81949A Compact Tunable Laser Source mod ule Serial No. Ambient temperature °C Options. Relative humidity Firmware Rev. Line frequency Special Notes: Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 136 Model: Keysight 81949A Report No. ________ Date: ________ Test Equipment Used Description Model No. Trace No. Cal. d ue date Standard Optical Head Optical Spectrum Analyzer Wavelength Meter Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 137 1595.000 nm 1610.000 nm 1620.000 nm 1630.000 nm Within full tuning range 1520 nm - 1630 nm Maximum Deviation Minimum Deviation Wavelength Deviation = Wavelength Measured - Wavelength Setting Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 138 Absolute Wavelength Accuracy Resul t Largest Value of Deviation (= largest of either Largest Maximum Deviation or Smallest Minimum Deviation). Absolute Wavelength Accuracy Test Limit ±0.1 Measurement Uncertainty: ±0.6 Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 139 ________ nm smallest measured wavelength ________ nm Wavelength Repeatability ________ nm (= largest measured wavelength - smallest measured wavelength) Upper Test Limit 0.01nm Measurement Uncertainty: ±0.1pm Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 140 +13.00dBm 1580.000nm __________ dBm +13.00dBm 1590.000nm __________ dBm +13.00dBm 1600.000nm __________ dBm +13.00dBm 1610.000nm __________ dBm +13.00dBm 1620.000nm __________ dBm +13.00dBm 1630.000nm __________ dBm +10.00dBm Measurement Uncertainty: ±4.5% Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 141 Maximum Power Linearity at current setting ________ dB Total Power Linearity at current setting ________ dBpp (= Maximum Power Linearity - Minimum Power Linearity) Upper Test Limit 0.2 dBpp Measurement Uncertainty ±0.04 dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 142 Upper Test Limit: 0.60 dBpp Performance Characteristic: dBpp Wavelength Range (1570nm - 1620nm) Maximum deviation: Minimum deviation: Flatness = Maximum - Minimum deviation: Upper Test Limit: 0.40 dBpp Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 143 Performance Tests Keysight Compact Tunable Laser Source module Performance Test Page 8 of 10 Performance Characteristic: dBpp Measurement Uncertainty: ±2.6% Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 144 1600.000nm +13.00dBm _______dB 48dB 1605.000nm +13.00dBm _______dB 48dB 1610.000nm +13.00dBm _______dB 48dB 1615.000nm +13.00dBm _______dB 48dB 1620.000nm +13.00dBm _______dB 48dB 1625.000nm +10.00dBm _______dB 45dB 1630.000nm +10.00dBm _______dB 45dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 145 OSA noise ________pW SSE_power_lTLS_max ________pW Power_total_SSE = OSA_noise +SSE_power_lTLS_max ________pW Measurement Result = Total SSE (use formula below) ________pW Lower Test Limit 22dB Performance Characteristic 25dBtypical Measurement Uncertainty: ±2.0dB Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 146 The Cleaning Instructions provided in this chapter apply to a number of different types of Optical Equipment. Cleaning Instructions for this Module If you must clean the Keysight Tunable Laser Source Family, please refer the module to the skilled personnel of Keysight’s service team. Cleaning Instructions...
  • Page 147 16 million W/m2). If this happens, measurements become inaccurate and non-repeatable. Cleaning is, therefore, an essential yet difficult task. Unfortunately, when Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 148 If you use isopropyl alcohol to clean your optical device, do not immediately dry the surface with compressed air (except when you are cleaning very sensitive optical devices). This is because the dust and the Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 149 Pressing too hard may lead to scratches on the surface or misalignment of your device. Just rub gently over the surface using a small circular movement. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 150 Some Cleaning Procedures need the following equipment, which is not required to clean each instrument: • Microscope with a magnification range about 50X up to 300X • Ultrasonic bath Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 151 For this reason we recommend you do not touch them. If you are not sure how sensitive your device is to cleaning, please contact the manufacturer or your sales distributor. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 152 When you have finished cleaning, put the dust cap back on, or close the shutter cap if the equipment is not going to be used immediately. Keep the caps on the equipment always when it is not in use. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 153 9 mm. This generally means you cannot see streaks or scratches on the surface. To be certain of the condition of the surface of your connector and to check it after cleaning, you need a microscope. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 154 Take a new, dry soft-tissue and remove the alcohol, dissolved sediment and dust, by rubbing gently over the surface using a small circular movement. Blow away any remaining lint with compressed air. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 155 Using a new, dry pipe-cleaner, and a new, dry cotton-swab remove the alcohol, any dissolved sediment and dust. Blow away any remaining lint with compressed air. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 156 If you do discover filaments or particles, the only way to clean a fixed connector interface and the input of the optical block is to use compressed air. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 157 Appendix highlights the main cleaning methods, but cannot address every individual circumstance. This section contain some additional hints which we hope will help you further. For further information, please contact your local Keysight Technologies representative. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 158 Never open the instruments as they can be damaged. Opening the instruments puts you in danger of receiving an electrical shock from your device, and renders your warranty void. Keysight 81940A, 44A, 49A, 80A & 89A Compact TLS Modules User’s Guide...
  • Page 159 This information is subject to change without notice. © Keysight Technologies 2017 Edition 7.0, July 2017 www.keysight.com...

This manual is also suitable for:

81944a81949a81980a81989a

Table of Contents