Keysight Technologies 81625B User Manual

Keysight Technologies 81625B User Manual

Optical head interface modules and optical heads
Table of Contents

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
Need help?

Need help?

Do you have a question about the 81625B and is the answer not in the manual?

Questions and answers

Summary of Contents for Keysight Technologies 81625B

  • 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 81618A/9A Optical Head Interface Modules and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 3 MENT OR ANY INFORMATION CONTAINED agreement and written consent from related to commercial computer software HEREIN. SHOULD KEYSIGHT AND THE Keysight Technologies as governed by or commercial computer software docu- USER HAVE A SEPARATE WRITTEN AGREE- United States and international copyright...
  • Page 4: Safety Summary

    M9505A AXIe chassis, must be followed. See: http://www.keysight.com/find/M9505A Keysight Technologies Inc. assumes no liability for the customer's failure to comply with these requirements. Before operation, review the instrument and manual for safety markings and instructions. You must follow these to ensure safe operation and to maintain the instrument in safe condition.
  • Page 5 Do Not Operate in an Do not operate the instrument in the presence of flammable gases or fumes. Explosive Atmosphere Do Not Remove the Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made only by qualified personnel. Instrument Cover Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel.
  • Page 6: General Safety Considerations

    General Safety Considerations Intended Use This instrument is intended to use in an office or laboratory environment, under the environmental conditions listed in the specifications. Safety Symbols The caution sign denotes a hazard. It calls attention to a procedure CAUTION which, if not correctly performed or adhered to, could result in damage to or destruction of the product.
  • Page 7 Symbol Description Indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use. Forty years is the expected useful life of the product. The C-Tick mark is the certification mark of the Australian Communications Authority.
  • Page 8: Compliance And Environmental Information

    Compliance and Environmental Information Table 2 Compliance and Environmental Information Safety Symbol Description This product complies with WEEE Directive (2002/96/EC) marking requirements. The affixed label indicates that you must not discard this electrical/electronic product in domestic household waste. Product Category: With reference to the equipment types in WEEE Directive Annex I, this product is classed as a “Monitoring and Control instrumentation”...
  • Page 10: Table Of Contents

    Contents Safety Summary General Safety Considerations Compliance and Environmental Information 1 Getting Started with Optical Heads Safety Considerations Safety Symbols Input Power Limitations Initial Inspection Line Power Requirements Operating Environment Storage and Shipment What is an Optical Head? Analog Output Optical input Heat Sink for 81628B optical Head Attaching the heat sink to the 81628B Optical Head...
  • Page 11 Contents 2 Accessories Modules and Options Optical Heads (5mm Sensors) High Power Optical Head (with integrating sphere) Connector Adapters - Reference List 3 Specifications Definition of Terms Averaging Time Linearity Linewidth Noise Power range Offset Reference conditions Relative uncertainty due to polarization Relative uncertainty due to speckle noise Relative uncertainty (spectral ripple) due to interference Return loss...
  • Page 12 Contents 4 Performance Tests Equipment Required Test Record Test Failure Instrument Specification Functional Tests Performance Tests For 81628B only Accuracy Test Test Setup Linearity Test Noise Test Return Loss Test Relative Uncertainty due to Polarization (Optional Test) Relative Uncertainty due to Interference (Optional Test) Calculation Sheets 5 Cleaning Information Cleaning Instructions for this Device...
  • Page 13 Contents Which Cleaning Procedure should I use? How to clean connectors How to clean connector adapters How to clean connector interfaces How to clean bare fiber adapters How to clean lenses How to clean instruments with a fixed connector interface How to clean instruments with an optical glass plate How to clean instruments with a physical contact interface How to clean instruments with a recessed lens interface...
  • Page 14: Getting Started With Optical Heads

    Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide Getting Started with Optical Heads This chapter introduces the features of the Keysight 81623B/4B/6B/8B Optical Heads. / 14 Safety Considerations / 17 What is an Optical Head? / 20 Attaching the heat sink to the 81628B Optical Head / 23 Operation...
  • Page 15: Safety Considerations

    Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements. Before operation, review the instrument and manual, including the red safety page, for safety markings and instructions.
  • Page 16: Input Power Limitations

    (connector adapters, screws) to become hotter than the required limit (55°C) of the safety standard IEC 61010- 1. Keysight Technologies Deutschland GmbH will not be liable for any damage caused by operation above 34 dBm. Initial Inspection Inspect the shipping container for damage.
  • Page 17: Operating Environment

    Getting Started with Optical Heads Operating Environment The safety information in the Keysight 8163B Lightwave Multimeter, Keysight 8164B Lightwave Measurement System, and 8166B Lightwave Multichannel System User’s Guide summarizes the operating ranges for the Keysight 81618A and Keysight 81619A Optical Head Interface Modules.
  • Page 18: What Is An Optical Head

    Getting Started with Optical Heads What is an Optical Head? An optical head measures the power emitted from a connected single-mode or multi-mode fiber or the power applied in an open parallel beam (with max. 5 mm diameter). The wavelength and power range depends on the sensor element.
  • Page 19: Analog Output

    Getting Started with Optical Heads Figure 3 on page -18 shows two types of adapter that are available for connecting the input fiber to an optical head as well as the 81624DD adapter ring that is used with threaded adapters. D-type magnetic connector Threaded connector D-shape-to-threaded...
  • Page 20: Optical Input

    Getting Started with Optical Heads Disabling Autoranging Select the best range for the application using the mainframes user interface. Select <Menu>, <Range Mode>, <Manual> and then choose from the list of ranges. Applications Possible applications for the analog output are: •...
  • Page 21: Attaching The Heat Sink To The 81628B Optical Head

    Getting Started with Optical Heads Attaching the heat sink to the 81628B Optical Head Always attach the heat sink and rubber ring to the 81628B if operating at NOTE an optical power higher than 34dBm! Applicable adapters Keysight adapters types 81000xx, 81000BT are applicable to the 81628B with the heat sink attached (without the heat sink and up to 34 dBm the 81000BT bare fiber adapter may be attached).
  • Page 22 Getting Started with Optical Heads The heat sink consists of two conical metal parts, the bottom part (smallest diameter at the bottom), and the top part (largest diameter at top). Slide the bottom part of the heat sink over the throat of the integrating sphere with the smallest diameter facing to the sphere.
  • Page 23 Getting Started with Optical Heads Attach the upper part of the heat sink to the integrating sphere. Slide the upper part over the connector adapter with the largest diameter facing opposite to the sphere. Tighten the screws with the Allen key enclosed in the Heat Sink Kit (see Figure 6 on page -22).
  • Page 24: Operation

    Getting Started with Optical Heads Operation For operating instructions, please refer to the User's Guide and Programming Guide for the 816x mainframe. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 26: Accessories

    Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide Accessories The Keysight 81618A/9A Optical Head Interface Modules and Keysight 81623B/4B/6B/8B Optical Heads 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

    Accessories Modules and Options Optical Heads (5mm Sensors) )RU DGYDQFHG DFFXUDF\ VHH 6SHFLDO &DOLEUDWLRQ RSWLRQV & DQG & ,QWHUIDFH 0RGXOH 2SWLFDO +HDGV IRU &RQQHFWRUL]HG )LEHU %DUH )LEHU DQG )LOWHU +ROGHU q %/ /HQV IRU >@ &RQQHFWRU &RQQHFWRU &RQQHFWRU ,QWHJUDO $GDSWHUV '6KDSHG WKUHDGHG $GDSWHUV...
  • Page 28: High Power Optical Head (With Integrating Sphere)

    Accessories High Power Optical Head (with integrating sphere) ,QWHUIDFH 0RGXOH +LJK 3RZHU 2SWLFDO +HDG IRU &RQQHFWRUL]HG )LEHU %DUH )LEHU DQG % ,Q*D$V &RQQHFWRU $GDSWHUV WKUHDGHG Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 29: Connector Adapters - Reference List

    Accessories Connector Adapters - Reference List Table 3 Connector Adapters Preferred Adapters Connector Type Threaded Version Integral D-shape for 5 mm optical heads Barefiber 81000BT 81000BC FC/PC 81000FA 81001FA SC/PC 81000KA 81001KA 81001MA E-2000 81000PA 81001PA 81000VA blank 81001ZA 81003LA 81001LA MTP(ribbon) 81003TD...
  • Page 30: Specifications

    Specifications The Keysight 81618A/9A Optical Head Interface Modules and Keysight 81623B/4B/6B/8B Optical Heads are produced to the ISO 9001 international quality system standard as part of Keysight Technologies’ commitment to continually increasing customer satisfaction through improved quality control. Specifications describe the modules’ and heads’ warranted performance.
  • Page 31: Definition Of Terms

    Specifications Definition of Terms This section defines terms that are used both in this chapter and Performance Tests on page 41. Generally, all specifications apply for the given environmental conditions and after warm-up time. Measurement principles are indicated. Alternative measurement principles of equal value are also acceptable.
  • Page 32: Linewidth

    Specifications Note 2: The power-dependent nonlinearity, N(P ), can alternatively be expressed by the following formula: ) r P – -------------------------------- - where r(P) is the power-dependent responsivity (for a power meter, the responsivity is defined as the ratio of displayed power to actual input power).
  • Page 33: Reference Conditions

    Specifications The power meter is adjusted to zero offset by doing a zero operation with NOTE darkened power meter. Reference conditions The specified conditions during the spectral responsivity calibration, or conditions which are extrapolated from the conditions during calibration. Conditions: power level, beam diameter or fiber type, numerical aperture, wavelength, spectral width, ambient temperature as specified, at the day of calibration.
  • Page 34: Relative Uncertainty Due To Speckle Noise

    Specifications Relative uncertainty due to speckle noise Spectral ripple is measured by stepping the source wavelength over the NOTE wavelength range specified. Specifies the uncertainty of the power reading caused by optical interference (see the note) between different optical paths within the power meters optical assembly when using a coherent source.
  • Page 35: Return Loss

    Specifications Conditions: constant wavelength, constant power level, angled connector as specified, linewidth of source <100 MHz, temperature as specified. Return loss The ratio of the incident power to the reflected power expressed in dB. Symbol: RL.   ------------- - ...
  • Page 36: Optical Head Specifications

    Specifications Optical Head Specifications All optical heads have to be operated with the single (Keysight 81618A) or dual (Keysight 81619A) Interface Modules. Table 4 Keysight 81620B Optical Head Specifications Silicon optical head 81620B Sensor element Si, Ø 5 mm Wavelength range Power range –90 dBm to +10 dBm Applicable fiber type...
  • Page 37 Specifications Table 5 Keysight 81623B Optical Head Specifications Ge optical head 81623B 81623B 81623B Calibration option C01 Calibration option C85 Sensor element Ge, Ø 5 mm Wavelength range 750 nm to 1800 nm Power range – 80 dBm to +10 dBm Applicable fiber type Open beam Uncertainty (accuracy) at...
  • Page 38 Specifications Table 6 Keysight 81624B & 81626B High Power Optical Head Specification High performance and 81624B 81624B 81626B 81626B high power optical heads Calibration option C01 Calibration option C01 Sensor element InGaAs, Ø 5 mm Wavelength range 800 nm to 1700 nm 850 nm to 1650 nm Power range –90 dBm to +10 dBm...
  • Page 39 +38 dBm is at the Averaging time (minimal) operators own risk. Analog Output Included Keysight Technologies Dimensions (H x W x D) 55 mm x 80 mm x 250 mm Deutschland GmbH will not Weight 0.9 kg (without heat sink)
  • Page 40: Supplementary Performance Characteristics

    Specifications Supplementary Performance Characteristics Analog Output Bandwith ≥DC, ≤300 to 5000 Hz depending on range and optical head. Output voltage 0 to 2 V non-terminated Output impedance 600 Ohm typ. Max. input voltage ±10V Range Bandwidth Bandwidth Bandwidth Bandwidth Bandwidth Bandwidth 81620B 81622B/3B...
  • Page 41: Maximum Safe Input Power

    Specifications Maximum Safe Input Power Model Maximum Safe Input Power 81620B +16 dBm 81623B +16 dBm 81624B +16 dBm 81626B +23.5 dBm (850 nm to 1650 nm) +27.5 dBm (1250 nm to 1650 nm) 81628B +40.5 dBm Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 42: Performance Tests

    Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide Performance Tests The procedures in this section test the performance of the instrument. The complete specifications to which Keysight 81623B/4B/6B/8B Optical Heads are tested are given in “Specifications on page 29”. All tests can be performed without access to the interior of the instrument.
  • Page 43: Equipment Required

    Performance Tests Equipment Required Equipment required for the performance test is listed in the table below. Any equipment that satisfies the critical specifications of the equipment given in the table may be substituted for the recommended models. Table 8 Equipment Required for Performance Test Instrument/Accessory Recommended Model Interface...
  • Page 44 Performance Tests Instrument/Accessory Recommended Model Interface Optical Head Alternative Models Wavelength Independent Special Tool – – – Coupler (3 dB) Best IF Adapter Special Tool – – – Worst IF Adapter Special Tool – – – Singlemode Fiber 81101AC (2/1* ea) –...
  • Page 45: Test Record

    (if you are already familiar with the test procedures). The Test Record can also be used as a permanent record and may be reproduced without written permission from Keysight Technologies. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 46: Test Failure

    Test Failure If the Keysight 81618A/19A Interface module or Keysight 81623B/4B/6B/8B Optical Head fails any performance test, return the instrument to the nearest Keysight Technologies Sales / Service Office for repair. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 47: Instrument Specification

    Performance Tests Instrument Specification Specifications are the performance characteristics of the instrument that is certified. These specifications, listed in Specifications on page 29, are the performance standards or limits against which the Keysight 81623B/4B/6B/8B Optical Head can be tested. Specifications on page 29 also lists some supplemental characteristics of the Keysight 81623B/4B/6B/8B Optical Head.
  • Page 48: Functional Tests

    Performance Tests Functional Tests The functional test applies to the Keysight 81618A/19A Interface modules. Mainframe 8163A/B with 8161xA Interface Module as DUT Figure 7 Functional Test Setup Set up the equipment as shown in Figure 7 on page -47 If you are using a Keysight 81619A Interface module connect one optical head to channel 1 and the other to channel 2 Power up the mainframe.
  • Page 49: Performance Tests

    Performance Tests Performance Tests The performance tests given in this section includes the Accuracy Test, the Linearity Test, the Return Loss Test (for the 81623B/26B) and the Noise Test. The performance tests for the Keysight 81624B/6B also include – as optional tests –...
  • Page 50: Accuracy Test

    Performance Tests The thermal characteristics of the sphere do not change from device to device, or during the product lifetime. If a head without the sphere passes the linearity test within the specifications given on the Test Record Sheet, then the whole system - sphere and head - is within the product specification.
  • Page 51: Test Setup

    Performance Tests Test Setup Make sure that cable connector, detectors and adapters are clean. Connect the equipment as shown in Figure 8. Figure 8 Accuracy Test Setup Make sure that the cables to and from the attenuator are fixed on the NOTE table and that both the optical head and the DUT are close together so that minimum cable movement is required when connecting the cable to...
  • Page 52 Performance Tests If you are using a Keysight 81657A Laser Source make sure you initialize the Keysight 8156A Optical Attenuator with 30 dB attenuation. Turn the instruments on, enable the laser source and allow the instruments to warm up for at least 20 minutes. Perform the following sub-procedure for both Power Meters: a Move to the Power Meter channel.
  • Page 53: Linearity Test

    Performance Tests Linearity Test This performance test applies to Keysight 81623B/4B/6B/8B Optical Heads. 81628B only: NOTE You have to disconnect the integrating sphere of the 81628B head to verify the linearity. Use the 81102SC high return loss patchcord to connect the DUT to the attenuator. Figure 9 Measurement Setup for Power Linearity Test Setup...
  • Page 54 Performance Tests The linearity test checks the in- range linearity as well as the range NOTE discontinuity. Therefore, two values are measured at the same power but within different power ranges (range discontinuity) and two different power values, one on the lower and the other on the upper limit of the power range, are measured within the same power range (in- range linearity).
  • Page 55 Performance Tests Initialize the two attenuators as follows: a Set the attenuation of the 8156A #221 with Monitor Output (referred to as Atty1) to 0 dB. b Set the attenuation of the other 8156A (referred to as Atty2) to 35 dB. Wait at least 15 minutes until the laser source has stabilized.
  • Page 56 Performance Tests +10 dBm Range (equivalent to +40 dBm range for 81628B) Applies to the 81626B only: Switch to the 20 dBm range and note both power readings as n=0 in the test record, which is given at the end of the test descriptions (#0, that is n=0).
  • Page 57 Performance Tests Switch down to the previous range (-10 dBm, 20 dBm for the 81628B) and note the values again (#7). Increase the attenuation of Atty1 by 10 dB and note the results in the test record (#8). At the DUT, 8162xB, press [Menu], move to <Range>, press Enter, move to <-20 dBm>(10 dBm for the 81628B), press Enter and press [Close].
  • Page 58 Performance Tests Increase the attenuation of Atty1 by 10 dB and note the results in the test record (#14). On the DUT switch one range down to the -40 dBm (-10 for 81628B) range. Change Setup Disable Atty1 and switch the output with the monitor output. Set the attenuation of Atty1 to 35 dB and of Atty2 to 25 dB.
  • Page 59 Performance Tests Switch one range down (-50 dBm, -20 dBm for the 81628B)) and note the power readings (#19). Increase the attenuation of Atty1 by 10 dB and note the results in the test record (#20). Calculation Calculate the non-linearity using the formulas given in the test record. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 60 Performance Tests Example: Measurement Results Information only Your Entries Atty1 / #221 Atty2 / #100 DUT Range REF Power DUT Power Notes [dB] [dB] [dBm] [dBm] [dBm] -47,1915 9,4273 1. Value -53,769 2,8467 InRange 35,5 -47,262 2,8524 RangeDisc / lower limit 35,5 -47,2605 2,8543...
  • Page 61 Performance Tests Calculations Conversion [dBm] ® [mW] Calculation as given Calculation as given REF Power DUT Power Relation 1 Relation 2 Non-Linearity [mW] [mW] (An) (Bn) (Rn) (Dn) *(NL +1) - n±1 1,90919E-05 8,76455761 0,2199125 4,5505092 4,19856E-06 1,926060834 1,87845E-05 1,928590397 1,0003454 0,9995626 0,03...
  • Page 62 Performance Tests The Nonlinearity is calculated recursively using n=10 as reference point. NOTE The formula is: where NL or NL is the previously calculated nonlinearity value. For n- 1 n=1, 4, 7 the values are NL , while they are NL for n=13, 16, 19.
  • Page 63: Noise Test

    Performance Tests Noise Test This performance test applies to Keysight 81623B/4B/6B/8B Optical Heads. You must insert a module or a blank panel in the second channel position NOTE of the Keysight 8163A/B Lightwave Multimeter before you perform the noise measurement. Insert a Keysight 81618A or a Keysight 81619A Optical Head Interface module into one slot of the Keysight 8163A/B Lightwave Multimeter and connect the device under test, an 8162xA/B Optical Head, to the...
  • Page 64 Performance Tests Figure 11 Return Loss Reference Setup To ensure traceability, use the 81610CC Reference Cable for calibration NOTE measurements. Do not use the 81610CC Reference Cable for measurements on a Device Under Test. Instead, use a measurement patchcord. It is important to maintain the quality of the straight connector end of the CAUTION 81610CC Reference Cable.
  • Page 65 Performance Tests At the Power Meter: a Set the averaging time [AvTime] to 1s b Set the wavelength [λ] to the wavelength of the RTL source. c Set [Pwr unit] to <db>. At the Return Loss Module: a Set the averaging time [AvTime] to 1s. b Enter the Return Loss Reference value RLref of the 81610CC reference cable for this wavelength.
  • Page 66: Relative Uncertainty Due To Polarization (Optional Test)

    Performance Tests 11 Now connect the open end to the optical head. 12 Enter the Power reading [P] on the optical head as [FPDelta] on the Return Loss Meter. Make sure you enter the sign of this value correctly. 13 Note the Return Loss reading as the Return Loss result into the test record.
  • Page 67 Performance Tests Figure 13 Measurement Setup for PDL Test Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 68: Relative Uncertainty Due To Interference (Optional Test)

    Performance Tests Relative Uncertainty due to Interference (Optional Test) The performance test "Relative Uncertainty due to Interference" is NOTE optional, since the interference is given with the production of the unit by mechanical and optical cavities and is unchanged by normal use of the sensor module.
  • Page 69 Performance Tests Figure 14 Setup for Relative Uncertainty due to Interference Measurement Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 70 Performance Tests Theoretically, both Power Meters are monitoring the power ratio over the variable wavelength in a predefined range as shown in Figure 15. Ensure that the tunable laser source is mode-hop free in the tested wavelength range. Figure 15 Interference Ripple Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 71 Performance Tests Performance Test for the Keysight 81623B Page 1 of 3 Model Keysight 81623B Optical Head_ Date ___________ Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev. _________________________ Line Frequency ___________ Hz Test Facility _________________________ Customer _________________________ Performed by...
  • Page 72 Performance Tests Interface Module Keysight 81619A ____________ ___________ CW Laser Source Keysight 81656A ____________ ___________ CW Laser Source Keysight 81657A ____________ ___________ CW Laser Source Keysight 81654A ____________ ___________ Opt. Head Interface Module Keysight 81618A ____________ ___________ Optical Head, Reference Keysight 81623B ____________ ___________...
  • Page 73 Performance Tests Accuracy Test [μW] measured at _______ nm 9.72 μW _______ 10.28 μW (1310nm) Output Power measured at _______ nm 9.72 μW _______ 10.28 μW (1550nm) Output Power Linearity Test For Calculations you may want to use the appropriate sheet Range [dBm] [dBm]...
  • Page 74 Performance Tests Noise Test [pW] _______ < 100 pW Return Loss Test [dB] 50 dB < _______ Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 75 Performance Tests Performance Test for the Keysight 81624B Page 1 of 3 Model Keysight 81624B Optical Head_ Date ___________ Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev. _________________________ Line Frequency ___________ Hz Test Facility _________________________ Customer _________________________ Performed by...
  • Page 76 Performance Tests Interface Module Keysight 81619A ____________ ___________ CW Laser Source Keysight 81656A ____________ ___________ CW Laser Source Keysight 81657A ____________ ___________ CW Laser Source Keysight 81654A ____________ ___________ Opt. Head Interface Module Keysight 81618A ____________ ___________ Optical Head, Reference Keysight 81624A ____________ ___________...
  • Page 77 Performance Tests Accuracy Test [μW] measured at _______ nm 9.72 μW _______ 10.28 μW (1310nm) Output Power measured at _______ nm 9.72 μW _______ 10.28 μW (1550nm) Output Power Linearity Test For Calculations you may want to use the appropriate sheet Range [dBm] [dBm]...
  • Page 78 Performance Tests _______ < 5 pW Return Loss Test [dB] typ. 60 dB _______ Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 79 Performance Tests Performance Test for the Keysight 81626B Page 1 of 3 Model Keysight 81626B Optical Head_ Date ___________ Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev. _________________________ Line Frequency ___________ Hz Test Facility _________________________ Customer _________________________ Performed by...
  • Page 80 Performance Tests Interface Module Keysight 81619A ____________ ___________ CW Laser Source Keysight 81656A ____________ ___________ CW Laser Source Keysight 81657A ____________ ___________ CW Laser Source Keysight 81654A ____________ ___________ Opt. Head Interface Module Keysight 81618A ____________ ___________ Optical Head, Reference Keysight 81624A ____________ ___________...
  • Page 81 Performance Tests Linearity Test For Calculations you may want to use the appropriate sheet Range [dBm] [dBm] Loss [%] ________ _______ <± 1.29% ________ _______ <± 0.93 % ________ _______ <± 0.93 % ________ _______ <± 0.93 % ________ _______ <±...
  • Page 82 Performance Tests The nonlinearity of the 81626B is not usually tested to the specified NOTE power level of +27 dBm. Instead, limited testing up to +9 dBm is used to test the electronic circuitry of the 81626B. Above +9 dBm the largest contribution to nonlinearity is from the absorbing glass filter (which is tested on a sample basis) that does not change its linearity with time.
  • Page 83 Performance Tests Performance Test for the Keysight 81628B Page 1 of 3 Model Keysight 81628B Optical Head_ Date ___________ Serial No. _________________________ Ambient Temperature ___________°C Options _________________________ Relative Humidity ___________ % Firmware Rev. _________________________ Line Frequency ___________ Hz Test Facility _________________________ Customer _________________________ Performed by...
  • Page 84 Performance Tests CW Laser Source Keysight 81656A ____________ ___________ CW Laser Source Keysight 81657A ____________ ___________ CW Laser Source Keysight 81654A ____________ ___________ Opt. Head Interface Module Keysight 81618A ____________ ___________ Optical Head, Reference Keysight 81624A ____________ ___________ Sensor Module Keysight 81634A ____________ ___________...
  • Page 85 Performance Tests ________ _______ <± 0.46 % ________ _______ <± 0.46 % ________ _______ <± 0.46 % ________ _______ <± 0.46 % +10* -17* Reference <± 0.46 % ________ _______ <± 0.46 % ________ _______ <± 0.46 % ________ _______ <±...
  • Page 86: Calculation Sheets

    Performance Tests Calculation Sheets Table 9 Calculation Sheet for Linearity Measurement (81623B, 81624B, 81628B) Your Entries Conversion [dBm] ® [mW] Calculation as given Calculation as given REF Power DUT Power Ref / R DUT / D Relation1 / A Relation2 / B Non-Linearity [dBm] [dBm]...
  • Page 87 Performance Tests Table 10 Calculation Sheet for Linearity Measurement (81626B) Your Entries Conversion [dBm] ® [mW] Calculation as given Calculation as given REF Power DUT Power Ref / R DUT / D Relation1 / A Relation2 / B Non-Linearity [dBm] [dBm] [mW] [mW]...
  • Page 88: Cleaning Information

    If you are unsure of the correct cleaning procedure for your optical device, we recommend that you first try cleaning a dummy or test device. Keysight Technologies assume no liability for the customer’s failure to comply with these requirements. / 88...
  • Page 89: Cleaning Instructions For This Device

    Cleaning Information Cleaning Instructions for this Device This Cleaning Information applies to a number of different types of Optical Equipment. Sections of particularly relevance to the following devices are cross-referenced below. 81000xA Optical Head Adapters When using optical head adapters, periodically inspect the optical head's front window (see How to clean connector adapters on page 100 for...
  • Page 90 Cleaning Information • Do not install parts or perform any unauthorized modification to optical devices. • Refer servicing only to qualified and authorized personnel. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 91: Why Is It Important To Clean Optical Devices

    Cleaning Information Why is it important to clean optical devices? μ In transmission links optical fiber cores are about 9 m (0.00035") in diameter. Dust and other particles, however, can range from tenths to hundredths of microns in diameter. Their comparative size means that they can cover a part of the end of a fiber core, and as a result will reduce the performance of your system.
  • Page 92: What Do I Need For Proper Cleaning

    • Compressed air Dust and shutter caps All of Keysight Technologies’ lightwave instruments are delivered with either laser shutter caps or dust caps on the lightwave adapter. Any cables come with covers to protect the cable ends from damage or contamination.
  • Page 93 Cleaning Information If possible avoid using denatured alcohol containing additives. Instead, apply alcohol used for medical purposes. Never drink this alcohol, as it may seriously damage your health. Do not use any other solvents, as some may damage plastic materials and claddings.
  • Page 94 Cleaning Information Pipe cleaner Pipe cleaners can be purchased from tobacconists, and come in various shapes and sizes.The most suitable one to select for cleaning purposes has soft bristles, which will not produces scratches. There are many different kinds of pipe cleaner available from tobacco nists.
  • Page 95: Additional Cleaning Equipment

    Cleaning Information Additional Cleaning Equipment 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 • Warm water and liquid soap •...
  • Page 96 Cleaning Information Some lenses and mirrors also have a special coating, which may be sensitive to mechanical stress, or to fat and liquids. 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.
  • Page 97: Preserving Connectors

    Always keep the caps on the equipment when it is not in use. All of Keysight Technologies’ lightwave instruments and accessories are shipped with either laser shutter caps or dust caps. If you need additional or replacement dust caps, contact your nearest Keysight Technologies Sales/Service Office.
  • Page 98: Cleaning Instrument Housings

    Cleaning Information Cleaning Instrument Housings Use a dry and very soft cotton tissue to clean the instrument housing and the keypad. Do not open the instruments as there is a danger of electric shock, or electrostatic discharge. Opening the instrument can cause damage to sensitive components, and in addition your warranty will be voided.
  • Page 99: Which Cleaning Procedure Should I Use

    Cleaning Information Which Cleaning Procedure should I use? Light dirt If you just want to clean away light dirt, observe the following procedure for all devices: • Use compressed air to blow away large particles. • Clean the device with a dry cotton swab. •...
  • Page 100 Cleaning Information Preferred Procedure Use the following procedure on most occasions. Clean the connector by rubbing a new, dry cotton swab over the surface using a small circular movement. Blow away any remaining lint with compressed air. Procedure for Stubborn Dirt Use this procedure when there is greasy dirt on the connector: Moisten a new cotton swab with isopropyl alcohol.
  • Page 101: How To Clean Connector Adapters

    Cleaning Information How to clean connector adapters Some adapters have an anti- reflection coating on the back to reduce CAUTION back reflection. This coating is extremely sensitive to solvents and mechanical abrasion. Extra care is needed when cleaning these adapters. Preferred Procedure Use the following procedure on most occasions.
  • Page 102: How To Clean Connector Interfaces

    Cleaning Information How to clean connector interfaces Be careful when using pipe cleaners, as the core and the bristles of the CAUTION pipe cleaner are hard and can damage the interface. Do not use pipe cleaners on optical head adapters, as the hard core of normal pipe cleaners can damage the bottom of an adapter.
  • Page 103: How To Clean Bare Fiber Adapters

    Cleaning Information How to clean bare fiber adapters Bare fiber adapters are difficult to clean. Protect from dust unless they are in use. Never use any kind of solvent when cleaning a bare fiber adapter as CAUTION solvents can: • Damage the foam inside some adapters. •...
  • Page 104: How To Clean Lenses

    Cleaning Information How to clean lenses Some lenses have special coatings that are sensitive to solvents, grease, liquid and mechanical abrasion. Take extra care when cleaning lenses with these coatings. Lens assemblies consisting of several lenses are not normally sealed. Therefore, use as little alcohol as possible, as it can get between the lenses and in doing so can change the properties of projection.
  • Page 105: How To Clean Instruments With An Optical Glass Plate

    Cleaning Information Only use clean, dry compressed air. Make sure that the air is free of dust, CAUTION water, and oil. If the air that you use is not clean and dry, this can lead to filmy deposits or scratches on the surface of your connector interface. This will degrade the performance of your transmission system.
  • Page 106: How To Clean Instruments With A Recessed Lens Interface

    Cleaning Information Preferred Procedure Use the following procedure on most occasions. Clean the interface by rubbing a new, dry cotton swab over the surface using a small circular movement. Blow away any remaining lint with compressed air. Procedure for Stubborn Dirt Use this procedure when there is greasy dirt on the interface: Moisten a new cotton swab with isopropyl alcohol.
  • Page 107: How To Clean Optical Devices Which Are Sensitive To Mechanical Stress And Pressure

    Cleaning Information Procedure for Stubborn Dirt Use this procedure when there is greasy dirt on the interface, and using the preferred procedure is not sufficient. Using isopropyl alcohol should be your last choice for recessed lens interfaces because of the difficulty of cleaning out any dirt that is washed to the edge of the interface: Moisten a new cotton swab with isopropyl alcohol.
  • Page 108: How To Clean Metal Filters Or Attenuator Gratings

    Cleaning Information Alternative Procedure For these types of optical devices you can often use an ultrasonic bath with isopropyl alcohol. Only use the ultrasonic bath if you are sure that it won't cause any damage any part of the device. Put the device into the bath for at least three minutes.
  • Page 109: Additional Cleaning Information

    Cleaning Information Additional Cleaning Information The following cleaning procedures may be used with other optical equipment: • How to clean bare fiber ends on page 108 • How to clean large area lenses and mirrors on page 108 How to clean bare fiber ends Bare fiber ends are often used for splices or, together with other optical components, to create a parallel beam.
  • Page 110 Cleaning Information Only use water if you are sure that there is no other way of cleaning your CAUTION optical device without causing corrosion or damage. Only use water if you are sure that there is no other way of cleaning your optical device without causing corrosion or damage.
  • Page 111 Cleaning Information Alternative Procedure B If your lens is sensitive to water then: Moisten the lens or the mirror with isopropyl alcohol. 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.
  • Page 112: Other Cleaning Hints

    Cleaning Information Other Cleaning Hints Selecting the correct cleaning method is an important element in maintaining your equipment and saving you time and money. This 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.
  • Page 113 Cleaning Information Cleaning the housing and the mainframe When cleaning either the mainframe or the housing of your instrument, only use a dry and very soft cotton tissue on the surfaces and the numeric pad. 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.
  • Page 115 This information is subject to change without notice. © Keysight Technologies 2018 Edition 7.1, December 2018 www.keysight.com...

This manual is also suitable for:

81619a81620b81623b81624b81626b81628b ... Show all

Table of Contents