Keysight Technologies 81618A User Manual
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Keysight Technologies 81618A User Manual

Optical head interface modules and optical heads
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Keysight 81618A/9A
Optical Head Interface Modules
and Keysight 81620B/3B/4B/6B/8B
Optical Heads
User's Guide

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Summary of Contents for Keysight Technologies 81618A

  • Page 1 Keysight 81618A/9A Optical Head Interface Modules and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 2 (EULA), a copy of which can be found HEREIN, INCLUDING BUT NOT LIMITED TO at http://www.keysight.com/find/sweula. THE IMPLIED WARRANTIES OF MER- The license set forth in the EULA represents CHANTABILITY AND FITNESS FOR A PAR- Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 3: 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 4 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. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 5: General Safety Considerations

    The laser radiation symbol. This warning symbol is marked on products which have a laser output. The electrostatic discharge symbol. This warning symbol is marked on products which have components that can be damaged by an electrostatic discharge. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 6 ISM GRP-1A classification according to the international EMC standard. ICES/NMB-001 compliance marking to the Canadian EMC standard. This symbol on all primary and secondary packaging indicates compliance to China standard GB 18455-2001. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 7: Compliance And Environmental Information

    “Monitoring and Control instrumentation” product. Do not dispose in domestic household waste. To return unwanted products, contact your local Keysight office, or see http://about.keysight.com/en/companyinfo/environment/takeback.shtml for more information. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 9: Table Of Contents

    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 Applicable adapters Mounting Instructions Operation Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 10 Relative uncertainty (spectral ripple) due to interference Return loss Spectral width of optical source Total uncertainty Uncertainty at reference conditions Wavelength range Literature Optical Head Specifications Supplementary Performance Characteristics Analog Output Maximum Safe Input Power Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 11 8162xx Optical Power Heads Safety Precautions Why is it important to clean optical devices? What do I need for proper cleaning? Standard Cleaning Equipment Additional Cleaning Equipment Preserving Connectors Cleaning Instrument Housings Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 12 How to clean optical devices which are sensitive to mechanical stress and pressure How to clean metal filters or attenuator gratings Add itional Cleaning Information How to clean bare fiber ends How to clean large area lenses and mirrors Other Cleaning Hints Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 13: 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...

  • Page 14: 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 15: 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 16: Operating Environment

    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. In order for these modules to meet specifications, the operating environment must be within the limits specified for the Keysight 8163B Lightwave Multimeter, Keysight 8164B Lightwave Measurement System, and 8166B Lightwave Multichannel System.

  • Page 17: What Is An Optical Head

    Figure 2 Front View of Optical Head without Adapter Figure 1 on page -17 and Figure 2 on page -17 show views of a typical optical head. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 18: Analog Output

    0 and 2V, 2V corresponding to a full power input signal in the current range, 0V corresponding to no input signal. During autoranging, the level to which 2V corresponds changes. You should disable autoranging when using the analog output. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 19: Optical Input

    The 81628B optical head has a heat sink that allows an extended operating power range. This heat sink must be mounted on the integrating sphere for operation from 34 dBm to 38 dBm. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 20: Attaching The Heat Sink To The 81628B Optical Head

    Check that the blue rubber ring is correctly attached to the integrating sphere and covers the metallic screws as shown in Figure 4 page -20. Figure 4 Attaching the Rubber Ring Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 21 Then screw on the desired adapter (81000xx series) to the sphere as shown in Figure 5 on page -21. Figure 5 Attaching the Bottom Part of the Heat Sink Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 22 Tighten the screws with the Allen key enclosed in the Heat Sink Kit (see Figure 6 on page -22). Figure 6 Attaching the Upper Part of the Heat Sink Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 23: 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 25: Accessories

    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 26: Modules And Options

    ,QWHUIDFH 0RGXOH 2SWLFDO +HDGV IRU &RQQHFWRUL]HG )LEHU %DUH )LEHU DQG )LOWHU +ROGHU q %/ /HQV IRU >@ &RQQHFWRU &RQQHFWRU &RQQHFWRU ,QWHJUDO $GDSWHUV '6KDSHG WKUHDGHG $GDSWHUV ZLWK LQWHJUDO &RQQHFWLYLW\ 6HW &RQQHFWLYLW\ 6HW Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 27: 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 28: Connector Adapters - Reference List

    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 Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 29: Specifications

    Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide 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.

  • Page 30: Definition Of Terms

    ⁄   ---------------- - Linearity   ⁄ Conditions: reference level 10 μW. Power range and range setting as specified. Note 1: Ideally Linearity is 0%, or 0 dB respectively. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 31: Linewidth

    The power range is defined from the highest specified input power level to the smallest input power level that causes a noticeable change of displayed power level. Conditions: wavelength, averaging time as specified. Offset The average power reading without incident optical power (dark). Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 32: Reference Conditions

    95% confidence level. Conditions: laser source with variable polarization state, generation of all possible polarization states (covering the entire Poincaré sphere), constant wavelength, constant power level, angled connector as specified, temperature as specified. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 33: Relative Uncertainty Due To Speckle Noise

    Uncertainty of power reading when using a coherent source, due to a wavelength-dependent periodic change of the power meter's responsivity caused by optical interference [1] between reflective interfaces within the power meter's optical assembly. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 34: Return Loss

    Note: Selectable wavelength setting of the power meter for useful power measurements (operating wavelength range). Literature [1]Fiber optic test and measurement, Hewlett Packard Professional Books, edited by Prentice Hall, ISBN 0-13-534330-5 Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 35: 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...
  • Page 36 C01 also with angled connector ≤8 °) • Angled connector 8 ° • For NA >0.2 add 1% Does not include noise; for wavelength < 1000 nm applies for –50 dBm to +10 dBm Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 37 300 s. Wavelength range 3 minutes. 8 °) 1200 nm to 1630 nm Max 30 °C above + 20 dBm input power • For NA > 0.2 add 1%. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 38 • Temperature 23 °C ±5 °C • Parallel beam, Ø 3 mm, center of sphere • Measurement time ≤ 3 min input, or connectorized fiber with NA ≤0.2 Does not include noise; zeroing required (straight connector) Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 39: Supplementary Performance Characteristics

    0.5 kHz 1.8 kHz † -50 dBm 0.05 kHz 0.05 kHz 0.12 kHz † -60 dBm 0.05 kHz 0.05 kHz 0.12 kHz Not applicable for 81622B † Not applicable for 81626B Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 40: Maximum Safe Input Power

    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 41: 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 42: Equipment Required

    Return Loss Module Keysight 81613A – – Kit, Performance Test 81628-68705 – – – – – Tunable Laser Source 8164A and – – – 81680A #022 Polarization Controller 11896A #025 – – – Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 43 Connector Interfaces 81000AI (3 ea) – – 81000FI (3 ea) – – 81000SI (4 ea) – – Plastic Cap PN 5040-9351 – – Legend : – not applicable; x necessary; o optional. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 44: 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 45: 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 46: Instrument Specification

    81623B/4B/6B/8B Optical Head. Supplemental characteristics should be considered as additional information. Keysight 81618A/19A Interface Modules are tested for functionality only. Any changes in the specifications due to manufacturing changes, design, or traceability to the National Institute of Standards and Technology (NIST), will be covered in a manual change supplement, or revised manual.

  • Page 47: Functional Tests

    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. If the Keysight 81618A/19A passes all self-tests, the module is considered fully functional. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 48: Performance Tests

    > 30 dBm. These linearity characteristics are determined by sample testing of the 81628B in OCMD’s metrology lab. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 49: Accuracy Test

    The linearity test must only be performed at either 1310 nm or 1550 nm. NOTE The accuracy test must be performed in the - 20 dBm range at 10.0 μW at both 1310 nm and 1550 nm. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 50: Test Setup

    (for the DUT) and 81000FA connector adapter (for reference power meter) instead. Move to the Laser Source channel, move to the wavelength parameter, [λ], press Enter, select the lower wavelength source, and press Enter. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 51 Ensure that the Keysight 8156A output is disabled. Move to the reference Power Meter channel that uses the Keysight 8162xB Optical Head and Keysight 81618A Optical Head Interface module, press [Menu], move to <Zero>, press Enter. Enable the Keysight 8156A output and change the attenuation until the reference Power Meter displays 10.00 mW.

  • Page 52: Linearity Test

    Figure 9 Measurement Setup for Power Linearity Test Setup • Do not turn the laser off during the measurement! NOTE • Clean all connectors carefully before you start with the measurement! Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 53 Press the [Menu] softkey and move to <Number of digits>, press Enter, move to <3>, press Enter and press [Close]. Always include at least three digits after the decimal point when you NOTE note a power reading. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 54 31 dB. This simulates the disconnected integrating sphere. If the power at the DUT overflows when switching to the lower range decrease the calibration factor (e.g. to 30 dB) and start the linearity test again. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 55 [Menu], move to <Zero all>, and press Enter. Enable Atty1. Switch one range up to the 0 dBm range (30 dBm for the 81628B) and note the power readings (#6). Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 56 Switch one range up to the -20 dBm range (10 dBm for the 81628B) and note the power readings (#12). Switch down to the previous range (-30 dBm, 0 dBm for the 81628B) and note the values again (#13). Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 57 [Menu], move to <Zero all>, and press Enter. Enable Atty1. Switch one range up to the -40 dBm (-10 dBm for the 81628B) range and note the power readings (#18). Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 58 (#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 59 -47,2195 -37,22538 RangeDisc / upper limit 45,5 17,6 -57,1333 -47,166 InRange 45,5 -47,1411 -47,164 RangeDisc / lower limit 41,2 11,3 -47,1355 -47,1664 RangeDisc / upper limit 51,2 11,3 -57,134 -57,163 InRange Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 60 0,9997928 0,01 1,89078E-06 0,000195479 10,004146 0,0999609 0,01 1,89714E-05 0,000188235 1,89692E-05 0,0001882 1,0001151 0,99981581 0,00 1,93495E-06 1,92044E-05 9,803474 0,1013767 0,03 1,93593E-05 1,92132E-05 1,93997E-05 1,92026E-05 1,001013651 0,9994475 0,08 1,93464E-06 1,92176E-06 9,996546719 0,1000783 0,13 Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 61 For n- 1 n=1, 4, 7 the values are NL , while they are NL for n=13, 16, 19. n- 2 Figure 10 Example of Linearity Test Result Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 62: Noise Test

    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 Optical Head Interface module.
  • Page 63 Zero the Return Loss Module and the Optical Head Enable the internal laser source of the Return Loss Module and allow 20 minutes for it to stabilize. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 64 10 At the Return Loss Module, press [TermCal] in order to calibrate the Return Loss Module at termination condition. Do not wrap the cable. The termination condition is realized with the NOTE open end of the patchcord. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 65: Relative Uncertainty Due To Polarization (Optional Test)

    The highest PDL value is taken as the "relative uncertainty due to polarization". The low output power path of the coupler is used to monitor the power stability of the setup. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 66 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 67: Relative Uncertainty Due To Interference (Optional Test)

    A and B for a specific wavelength point has to be no greater than 2 ms. Due to this short measurement interval, the performance test of the Relative Uncertainty Due to Interference can only be performed under computer control. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 68 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 69 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 70 Description Model No. Trace No Cal. Due Date Lightwave Multimeter (Std.) 8163A/B ____________ ___________ Lightwave Multimeter (DUT) 8163A/B ____________ ___________ TLS Mainframe 8164A/B ____________ ___________ Interface Module Keysight 81618A ____________ ___________ Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 71 81000SA 81000FA Performance Test for the Keysight 81623B Page 3 of 3 Model Keysight 81623B Optical Head Report No.________ Date ________________ Test Test Description Min. Result Max. Measurement Spec. Spec. Uncertainty Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 72 <± 0.58 % ________ _______ <± 0.58 % ________ _______ <± 0.63 % ________ _______ <± 0.63 % ________ _______ <± 1.08 % ________ _______ <± 1.08% ________ _______ <± 5.59 % Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 73 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 74 Description Model No. Trace No Cal. Due Date Lightwave Multimeter (Std.) 8163A/B ____________ ___________ Lightwave Multimeter (DUT) 8163A/B ____________ ___________ TLS Mainframe 8164A/B ____________ ___________ Interface Module Keysight 81618A ____________ ___________ Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 75 81000SA 81000FA Performance Test for the Keysight 81624B Page 3 of 3 Model Keysight 81624B Optical Head Report No.________ Date ________________ Test Test Description Min. Result Max. Measurement Spec. Spec. Uncertainty Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 76 <± 0.46 % ________ _______ <± 0.49 % ________ _______ <± 0.49 % ________ _______ <± 0.71 % ________ _______ <± 0.71 % ________ _______ <± 2.97 % Noise Test [pW] Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 77 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 78 Description Model No. Trace No Cal. Due Date Lightwave Multimeter (Std.) 8163A/B ____________ ___________ Lightwave Multimeter (DUT) 8163A/B ____________ ___________ TLS Mainframe 8164A/B ____________ ___________ Interface Module Keysight 81618A ____________ ___________ Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 79 Measurement Spec. Spec. Uncertainty Accuracy Test [μW] measured at _______ nm 9.64 μW _______ 10.36 μW (1310nm) Output Power measured at _______ nm 9.64 μW _______ 10.36 μW (1550nm) Output Power Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 80 [1] The 20 dB range measurement is only performed to check the functionality of the current booster. The published specification does not apply to operation in non-automode as used here to check the functionality. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 81 Thus it is guaranteed by design that testing the 81626B up to +9 dBm ensures specification compliance to +27 dBm Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 82 Cal. Due Date Lightwave Multimeter (Std.) 8163A/B ____________ ___________ Lightwave Multimeter (DUT) 8163A/B ____________ ___________ TLS Mainframe 8164A/B ____________ ___________ Interface Module Keysight 81618A ____________ ___________ Interface Module Keysight 81619A ____________ ___________ Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 83 Spec. Uncertainty Linearity Test (without sphere) For Calculations you may want to use the appropriate sheet Range [dBm] [dBm] Loss [%] ________ _______ <± 0.46 % ________ _______ <± 0.46 % Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 84 _______ nm 9.64 μW _______ 10.36 μW (1310nm) Output Power measured at _______ nm 9.64 μW _______ 10.36 μW (1550nm) Output Power Noise Test [pW] _______ < 5 nW Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 85: Calculation Sheets

    Calculation as given REF Power DUT Power Ref / R DUT / D Relation1 / A Relation2 / B Non-Linearity [dBm] [dBm] [mW] [mW] +1) - 1 n±1 Reference Level 0.00 Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 86 Calculation as given REF Power DUT Power Ref / R DUT / D Relation1 / A Relation2 / B Non-Linearity [dBm] [dBm] [mW] [mW] +1) - 1 n±1 Reference Level 0.00 Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 87: 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 88: Cleaning Instructions For This Device

    To prevent electrical shock, disconnect the instrument from the mains before cleaning. Use a dry cloth, or one slightly dampened with water, to clean the external case parts. Do not attempt to clean internally. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 89 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 90: Why Is It Important To Clean Optical Devices

    In this section, we want to suggest ways to help you clean your various optical devices, and thus significantly improve the accuracy and repeatability of your lightwave measurements. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 91: What Do I Need For Proper Cleaning

    You should therefore first remove the alcohol and the dust with a soft tissue, and then use compressed air to blow away any remaining filaments. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 92 Use only clean, fresh soft tissues and never apply them twice. Any dust and dirt from the air which collects on your tissue, or which has gathered after initial cleaning, may scratch and pollute your optical device. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 93 Such condensation leaves behind a filmy deposit. Please be friendly to your environment and use a CFC-free aerosol. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 94: Additional Cleaning Equipment

    Ensure that your liquid soap has no abrasive properties or perfume in it. You should also avoid normal washing up liquid, as it can cover your device in an iridescent film after it has been air dried. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 95 Take care never to look into the end of a fiber or any other optical component, when they are in use. This is because the laser can seriously damage your eyes. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 96: Preserving Connectors

    They are liable to impair and dirty the surface of the device. In addition, the characteristics of your device can be changed and your measurement results affected. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 97: Cleaning Instrument Housings

    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. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 98: Which Cleaning Procedure Should I Use

    Hold the card approximately 5 cm from the output of the connector. The invisible emitted light is projected onto the card and becomes visible as a small circular spot. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 99 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 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 100: How To Clean Connector Adapters

    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 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 101: How To Clean Connector Interfaces

    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 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 102: How To Clean Bare Fiber Adapters

    Clean the adapter by rubbing a new, dry cotton swab over the surface using a small circular movement. Blow away any remaining lint with compressed air. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 103: How To Clean Lenses

    If there are fluids or fat in the connector, please refer the instrument to the skilled personnel of Keysight’s service team. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 104: How To Clean Instruments With An Optical Glass Plate

    To assess the projection of the emitted light beam you can use an infrared sensor card. Hold the card approximately 5 cm from the interface. The invisible emitted light is projected onto the card and becomes visible as a small circular spot. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 105: How To Clean Instruments With A Recessed Lens Interface

    If this is not sufficient, then 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. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 106: How To Clean Optical Devices Which Are Sensitive To Mechanical Stress And Pressure

    Put the film on the surface and wait at least 30 minutes to make sure that the film has had enough time to dry. Remove the film and any dirt with special adhesive tapes. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 107: How To Clean Metal Filters Or Attenuator Gratings

    10 minutes. Remove the fluid using compressed air at some distance and with low pressure. If there are any streaks or drying stains on the surface, repeat the whole cleaning procedure. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 108: Additional Cleaning Information

    Use the following procedure on most occasions. Blow away any dust or dirt with compressed air. Procedure for Stubborn Dirt Use this procedure when there is greasy dirt on the lens: Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 109 Put the film on the surface and wait at least 30 minutes to make sure that the film has had enough time to dry. Remove the film and any dirt with special adhesive tapes. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 110 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 remaining lint with compressed air. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...

  • Page 111: Other Cleaning Hints

    They are liable to dirty the detector and impair its performance. They may also alter the property of depiction of your optical device, thus rendering your measurements inaccurate. Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 112 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 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User’s Guide...
  • Page 114 This information is subject to change without notice. © Keysight Technologies 2017 Edition 7.0, June 2017 www.keysight.com...

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