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Definition of Terms

Specifications

Agilent 81662A and 81663A DFB Laser Source Modules User’s Guide, Fifth Edition

29

Polarization extinction ratio (PER)

The ratio of optical power in the slow axis of the polarization-

maintaining fiber to optical power in the fast axis.

Measurement

: with a polarization analyzer by mechanically stressing 

the Panda fiber.

Coherence control

Linewidth broadening of optical signal by internal laser modulation.

Modulation, digital

Output signal is modulated with 50% duty cycle by internal on / off 

switching of the laser current.  Switching frequencies as specified.

ON- switching with fast output power 
stabilization

When the laser is switched on after the specified warm-up time the 

output power will settle within the specified time to comply with the 

power stability specifications.

Tuning Speed

Maximum time required to change the wavelength of the optical signal 

between the extreme ends of the specified wavelength tuning range.

Summary of Contents for 81662A

Page 1: ... underutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In stock Ready to ship TAR certified secure asset solutions Expert team I Trust guarantee I 100 satisfaction All trademarks brand names and brands appearing herein are the property of their respective ...

Page 2: ...S1 Agilent 81662A and Agilent 81663A DFB Laser Source Modules User s Guide ...

Page 3: ...gnated by Agilent for use with an instrument will execute its programming instructions when properly installed on that instrument Agilent does not warrant that the operation of the instrument software or firmware will be uninterrupted or error free Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied soft...

Page 4: ...ese requirements Before operation review the instrument and manual including the red safety page for safety markings and instructions You must follow these to ensure safe operation and to maintain the instrument in safe condition WARNING The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adhered to could result in injury or ...

Page 5: ...panels etc WARNING You MUST return instruments with malfunctioning laser modules to an Agilent Technologies Service Center for repair and calibration Line Power Requirements The Agilent 81662A and Agilent 81663A DFB Laser Source Modules operate when installed in the Agilent 8163A Lightwave Multimeter Agilent 8164A Lightwave Measurement System or Agilent 8166A Lightwave Multichannel System Operatin...

Page 6: ...r Notice No 50 dated 2001 July 26 Table 1 DFB Laser Source Modules Safety Information Agilent 81662A Agilent 81663A Laser type CW DFB Laser with built in isolator CW DFB Laser with built in isolator Wavelength range 1500 1650 NM see dis play 1500 1650 NM see dis play Max CW output power 15 mW 28 mW Beam waist diameter 9 µm 9 µm Numerical aperture 0 1 0 1 Laser Class according to IEC 60825 1 2001 I...

Page 7: ...ings Under no circumstances look into the end of an optical cable attached to the optical output when the device is operational The laser radiation can seriously damage your eyesight Do not enable the laser when there is no fiber attached to the optical output connector The laser is enabled by pressing the gray button close to the optical output connector on the front panel of the module The laser...

Page 8: ...Initial Safety Information for DFB Laser Source Modules Safety Considerations Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition 7 ...

Page 9: ...Safety Considerations Initial Safety Information for DFB Laser Source Modules 8 Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition ...

Page 10: ...ting Started with DFB Laser Source Modules 15 What is a DFB Laser Source Module 15 A Description of the Front Panel 15 How to Enable Disable Laser Output 15 Optical Output 16 Polarization Maintaining Fiber 16 Angled Contact Connectors 16 Operation Note 17 Maintaining Wavelength Accuracy Below Maximum Power17 Accessories 19 Recommended Connector Interfaces 21 ITU Channel Options 22 Specifications 2...

Page 11: ... Performance Test Instructions 36 All Wavelength Tests 37 General Settings for Burleigh WA 1500 Wavelength Meter 37 Wavelength Repeatability Test 37 Wavelength Stability Test 39 Cleaning Information 45 Safety Precautions 47 Why is it important to clean optical devices 47 What do I need for proper cleaning 48 Standard Cleaning Equipment 48 Dust and shutter caps 48 Isopropyl alcohol 49 Cotton swabs ...

Page 12: ...ow to clean lenses 58 How to clean instruments with a fixed connector interface 58 How to clean instruments with an optical glass plate 59 How to clean instruments with a physical contact interface 59 How to clean instruments with a recessed lens interface 60 How to clean optical devices which are sensitive to mechanical stress and pressure 61 How to clean metal filters or attenuator gratings 62 A...

Page 13: ...Table of Contents 12 Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition ...

Page 14: ...Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition 13 Getting Started with DFB Laser Sources ...

Page 15: ...arted with DFB Laser Sources 14 Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition This chapter introduces the features of the Agilent 81662A and Agilent 81663A DFB Laser Source Modules ...

Page 16: ...n the user interface of your mainframe The wavelength of the ITU channel your module supports is displayed on the front panel see Figure 3 A Description of the Front Panel Figure 3 Front Panel of DFB Laser Source Modules To insert these modules into your mainframe see your mainframe s User s Guide How to Enable Disable Laser Output This indicates whether the module is emitting radiation If the Sta...

Page 17: ...ant measurement conditions Figure 4 PMF Output Connector Angled Contact Connectors The Agilent 81662A and Agilent 81663A DFB Laser Source modules are equipped with an angled contact optical output connector as standard Angled contact connectors help you to control return loss With angled fiber endfaces reflected light tends to reflect into the cladding reducing the amount of light that reflects ba...

Page 18: ...the laser diode changes this can mean that the actual output wavelength may differ from the wavelength displayed on the user interface of your mainframe To ensure wavelength accuracy at less than maximum power you should perform the steps listed below You will need to use a wavelength meter we recommend the HP 86120C Multi Wavelength Meter 1 Set up your equipment as displayed in Figure 6 Figure 6 ...

Page 19: ...o P and press Enter b Reduce the power value below the maximum power for the module The maximum power for the 81662A is 10 dBm the maximum power for the 81663A is 13 dBm 4 Allow your wavelength meter to settle to a stable wavelength value If the displayed value is not accurate enough for your application on the user interface of your 8163A Lightwave Multimeter perform the following steps a Move to...

Page 20: ...Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition 19 Accessories ...

Page 21: ...les User s Guide Fifth Edition Agilent 81662A and Agilent 81663A DFB Laser Source Modules 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 22: ... User s Guide Fifth Edition 21 Recommended Connector Interfaces Figure 7 Recommended Connector Interfaces HP 8163A Lightwave Multimeter 1 2 Connector Interface DFB Source Module DFB Laser Source Module 81662A 81663A Connector Interfaces 81000HI E 2000 81000KI SP APC 81000NI FC APC 81000SI DIN4108 ...

Page 23: ... 195 30 1 535 04 325 195 20 1 535 82 327 195 10 1 536 61 329 195 00 1 537 40 331 194 90 1 538 19 333 194 80 1 538 98 335 194 70 1 539 77 337 194 60 1 540 56 339 194 50 1 541 35 341 194 40 1 542 14 343 194 30 1 542 94 345 194 20 1 543 73 347 194 10 1 544 53 349 194 00 1 545 32 351 193 90 1 546 12 353 193 80 1 546 92 355 193 70 1 547 72 357 193 60 1 548 51 359 193 50 1 549 32 361 193 40 1 550 12 363...

Page 24: ... 567 95 407 191 10 1 568 77 409 191 00 1 569 59 411 190 90 1 570 42 413 190 80 1 571 24 415 190 70 1 572 06 417 160 60 1 572 89 419 160 50 1 573 71 421 190 40 1 574 54 423 190 30 1 575 37 425 190 20 1 576 20 427 190 10 1 577 03 429 190 00 1 577 86 431 189 90 1 578 69 433 189 80 1 579 52 435 189 70 1 580 35 437 189 60 1 581 18 439 189 50 1 582 02 441 189 40 1 582 85 443 189 30 1 583 69 445 189 20 1...

Page 25: ... 594 64 471 187 90 1 595 49 473 187 80 1 596 34 475 187 70 1 597 19 477 187 60 1 598 04 479 187 50 1 598 89 481 187 40 1 599 75 483 187 30 1 600 60 485 187 20 1 601 46 487 187 10 1 602 31 489 187 00 1 603 17 491 186 90 1 604 03 493 186 80 1 604 88 495 186 70 1 605 74 497 186 60 1 606 60 499 186 50 1 607 47 501 186 40 1 608 33 503 186 30 1 609 19 505 186 20 1 610 06 Agilent 81662A and 81663A Option...

Page 26: ...Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition 25 Specifications ...

Page 27: ... standard as part of Agilent s commitment to continually increasing customer satisfaction through improved quality control Specifications describe the module s warranted performance 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 ...

Page 28: ...tuning range Conditions at specified conditions and coherence control off Measurement with wavelength meter Wavelength display resolution The smallest possible displayed wavelength increment decrement Wavelength repeatability The random uncertainty in reproducing the wavelength after detuning and re setting the wavelength The wavelength repeatability is half the span between the maximum and the mi...

Page 29: ...tions at ITU T center wavelength Measurement with power meter at the end of a single mode fiber patchcord Power CW stability The change of the power level during given time span expressed as half the span in dB between the highest and lowest measured power Conditions uninterrupted DFB SOURCE MODULE output power constant wavelength and power level settings controlled environment and time span as sp...

Page 30: ...th broadening of optical signal by internal laser modulation Modulation digital Output signal is modulated with 50 duty cycle by internal on off switching of the laser current Switching frequencies as specified ON switching with fast output power stabilization When the laser is switched on after the specified warm up time the output power will settle within the specified time to comply with the po...

Page 31: ...Specifications Definition of Terms 30 Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition ...

Page 32: ...m 3pm typ 1pm typ 5pm ITU Grid 100 GHz typ 850pm 10pm 5pm typ 2pm 5pm typ 2pm typ 5pm Fiber type Panda PMF 9 125 µm Output Connector 7 Compatible to angled contact APC ASC DIN47256 4108 Power Max Output 3 6 CW Stability 15min 5 CW Stability 24 h 4 5 typ 10 dBm 10 mW typ 0 005 dB typ 0 03 dB typ 13 dBm 20 mW typ 0 003 dB typ 0 01 dB Side Mode Suppression Ratio SMSR 6 typ 45 dB typ 50 dB Polarizatio...

Page 33: ... in steps of 0 1 dB Tuning speed over full range 30 s Polarization maintaining fiber orientation TE mode in slow axis in line with connector key 1 ITU grid wavelength is shown on display by default ITU Channel Options on page 24 details the peak wavelength that corresponds to each module s option number 2 Via GPIB tuning resolution 10pm 3 Class 3A according to IEC 60825 1 1998 and Class IIIb accor...

Page 34: ...Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition 33 Performance Tests ...

Page 35: ...tical performance of the instrument The complete specifications to which the Agilent 81662A and Agilent 81663A DFB Laser Source Modules are tested are given in Specifications on page 25 All tests can be performed without access to the interior of the instrument The performance tests refer specifically to tests carried out with APC connectors ...

Page 36: ...ay be reproduced without written permission from Agilent Technologies Test Failure If the Agilent 81662A or the Agilent 81663A DFB Laser Source Module fails any performance test return the instrument to the nearest Agilent Technologies Sales Service Office for repair Instrument Accessory Recommended Model 81662A 81663A Required Characterisics Alternative Models Multimeter Mainframe Agilent 8163A x...

Page 37: ...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 Such specifications supersede any that were previously published Performance Test Instructions The performance tests given in this section include the Wavelength Repeatability Test and the Wavelength Sta...

Page 38: ...length Meter as follows Set Display to Wavelength Set Medium to Vacuum Set Resolution to Auto Set Averaging to On Set Input Attenuator to Auto Wavelength Repeatability Test 1 Move to the DFB Source channel of the Agilent 8163A 4A 6A mainframe and press Menu 2 Set the Wavelength mode to Offset and adjust the Power reading to 1mW or 0dBm 3 Close the Menu 4 Press the key beside the laser output to sw...

Page 39: ...ter has settled 9 Repeat steps 5 to 8 for all frequency offsets given in the test record 10 From all the wavelength measurements pick the largest measured value and the smallest measured value 11 Calculate the wavelength repeatability by subtracting the largest measured value from the smallest measured value Example for 81662A 315 Repeatability of Df 50 GHz reference Measurement Results nm Specifi...

Page 40: ...er output to switch on the laser ouput 6 Every minute for 15 minutes note the Wavelength Meter reading in the test record 7 From all the wavelength measurements pick the largest measured value and the smallest measured value 8 Calculate the wavelength stability by subtracting the largest measured value from the smallest measured value Example for 81662A 315 Stability of 1531 90 nm Measurement Resu...

Page 41: ...Performance Tests Performance Test Instructions 40 Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition ...

Page 42: ..._____________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________ _______________________...

Page 43: ...____ ____________ ____________ ___________ 4 ____________________________ ____________ ____________ ___________ 5 ____________________________ ____________ ____________ ___________ 6 ____________________________ ____________ ____________ ___________ 7 ____________________________ ____________ ____________ ___________ 8 ____________________________ ____________ ____________ ___________ 9 __________...

Page 44: ... 15min nm nm measured at ________nm 0 GHz offset frequency ________ 1 1 0 006 nm for 81662A or 0 01 nm for 81663A Repeatability of f 50 GHz reference Measurement Result Repeatability of f 0 GHz reference Measurement Result Initial Setting REF nm Initial Setting REF nm from 30 GHz to 50 Ghz nm from 30 GHz to 50 Ghz nm from 10 GHz to 50 GHz nm from 10 GHz to 50 GHz nm from 0 GHz to 50 GHz nm from 0 ...

Page 45: ...t Result Initial Setting REF nm from 30 GHz to 50 Ghz nm from 10 GHz to 50 GHz nm from 0 GHz to 50 GHz nm from 10 GHz to 50 GHz nm from 30 GHz to 50 GHz nm from 50 GHz to 50 GHz nm largest measured value nm smallest measured value nm Wavelength Repeatability nm Stability of ______ __nm Measurement Result nm Start Value 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 largest measured value smallest measured va...

Page 46: ...Cleaning Information Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition 45 Cleaning Information ...

Page 47: ...ting connectors and dry connections Clean the connectors interfaces and bushings carefully after use 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 Agilent Technologies assume no liability for the customer s failure to comply with these requirements Cleaning Instructions for this Instrument This Cleaning I...

Page 48: ...e device is operational The laser radiation is not visible to the human eye but it can seriously damage your eyesight 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 Do not install parts or perform any unauthorized modification to optical devi...

Page 49: ...nt to suggest ways to help you clean your various optical devices and thus significantly improve the accuracy and repeatability of your lightwave measurements What do I need for proper cleaning Some Standard Cleaning Equipment is necessary for cleaning your instrument For certain cleaning procedures you may also require certain Additional Cleaning Equipment Standard Cleaning Equipment Before you c...

Page 50: ...le avoid using denatured alcohol containing additives Instead apply alcohol used for medical purposes Never drink this alcohol as it may seriously damage to your health Do not use any other solvents as some may damage plastic materials and claddings Acetone for example will dissolve the epoxy used with fiber optic connectors To avoid damage only use isopropyl alcohol Cotton swabs We recommend that...

Page 51: ...s 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 The best way to use a pipe cleaner is to push it in and out of the device opening for example when cleaning an interface While you are cleaning you should slowly rotate the pipe c...

Page 52: ...cope with a magnification range about 50X up to 300X A microscope can be found in most photography stores or can be obtained through or specialist mail order companies Special fiber scopes are available from suppliers of splicing equipment Ideally the light source on your microscope should be very flexible This will allow you to examine your device closely and from different angles A microscope he...

Page 53: ...ot touch them If you are not sure how sensitive your device is to cleaning please contact the manufacturer or your sales distributor Premoistened cleaning wipes Use pre moistened cleaning wipes as described in each individual cleaning procedure Cleaning wipes may be used in every instance where a moistened soft tissue or cotton swab is applied Polymer film Polymer film is available from laboratory...

Page 54: ...y your fiber surface 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 Always keep the caps on the equipment when it is not in use All of Agilent 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 n...

Page 55: ...t If you are unsure of how sensitive your device is to cleaning please contact the manufacturer or your sales distributor How to clean connectors Cleaning connectors is difficult as the core diameter of a single mode fiber is only about 9 µm 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 ...

Page 56: ...l 2 Clean the connector by rubbing the cotton swab over the surface using a small circular movement 3 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 4 Blow away any remaining lint with compressed air An Alternative Procedure A better more gentle but more expensive cleaning procedure is to use an ultra...

Page 57: ...y remaining lint with compressed air How to clean connector interfaces CAUTION Be careful when using pipe cleaners as the core and the bristles of the 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 Preferred Procedure Use the following procedure on most occasions 1 Cle...

Page 58: ...ent when cleaning a bare fiber adapter as solvents can Damage the foam inside some adapters Deposit dissolved dirt in the groove which can then dirty the surface of an inserted fiber Preferred Procedure Use the following procedure on most occasions 1 Blow away any dust or dirt with compressed air Procedure for Stubborn Dirt Use this procedure when there is greasy dirt on the adapter 1 Clean the ad...

Page 59: ...ompressed air Procedure for Stubborn Dirt Use this procedure when there is greasy dirt on the lens 1 Moisten a new cotton swab with isopropyl alcohol 2 Clean the lens by rubbing the cotton swab over the surface using a small circular movement 3 Using a new dry cotton swab remove the alcohol any dissolved sediment and dust 4 Blow away any remaining lint with compressed air How to clean instruments ...

Page 60: ...ecause it is easy to scratch optical components and cause them to become misaligned How to clean instruments with an optical glass plate Some instruments for example the optical heads from Agilent Technologies have an optical glass plate to protect the sensor Clean this glass plate in the same way as optical lenses see How to clean lenses on page 58 How to clean instruments with a physical contact...

Page 61: ...or Stubborn Dirt Use this procedure when there is greasy dirt on the interface 1 Moisten a new cotton swab with isopropyl alcohol 2 Clean the interface by rubbing the cotton swab over the surface using a small circular movement 3 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 4 Blow away any remaining...

Page 62: ...f the interface 1 Moisten a new cotton swab with isopropyl alcohol 2 Clean the interface by rubbing the cotton swab over the surface using a small circular movement 3 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 4 Blow away any remaining lint with compressed air How to clean optical devices which ar...

Page 63: ... procedure How to clean metal filters or attenuator gratings This kind of device is extremely fragile A misalignment of the grating leads to inaccurate measurements Never touch the surface of the metal filter or attenuator grating Be very careful when using or cleaning these devices Do not use cotton swabs or soft tissues as there is the danger that you cannot remove the lint and that the device w...

Page 64: ... in order to protect the surface from dirt How to clean large area lenses and mirrors Some mirrors as those from a monochromator are very soft and sensitive Therefore never touch them and do not use cleaning tools such as compressed air or polymer film Some lenses have special coatings that are sensitive to solvents grease liquid and mechanical abrasion Take extra care when cleaning lenses with th...

Page 65: ... a little liquid soap on the surface and gently spread the liquid over the whole area 3 Wash off the emulsion with water being careful to remove it all as any remaining streaks can impair measurement accuracy 4 Take a new dry soft tissue and remove the water by rubbing gently over the surface using a small circular movement 5 Blow away remaining lint with compressed air Alternative Procedure A To ...

Page 66: ...pter Otherwise the fiber end will rub up against something which could scratch it and leave deposits Lens cleaning papers Some special lens cleaning papers are not suitable for cleaning optical devices like connectors interfaces lenses mirrors and so on To be absolutely certain that a cleaning paper is applicable please ask the salesperson or the manufacturer Immersion oil and other index matching...

Page 67: ...Cleaning Information Other Cleaning Hints 66 Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition ...

Page 68: ...Information 5 ITU Channel Options 22 O Optical Output 16 P Performance Tests 33 Agilent 8166_A 41 All Wavelength Tests 37 Equipment Required 35 Instructions 36 Test Failure 35 Test Record 35 Wavelength Repeatability 37 Wavelength Stability 39 Polarization Maintaining Fiber 16 R Recommended Connector Interfaces 21 S Safety information for laser source 5 Specifications 25 DFB Source Module 31 Supple...

Page 69: ...68 Agilent 81662A and 81663A DFB Laser Source Modules User s Guide Fifth Edition ...

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Page 71: ... Agilent Technologies GmbH 2000 2002 Printed in Germany February 20 2002 81661 90A15 81661 90A15 www agilent com ...

Page 72: ...quipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentation Artisan Scientific Corporation dba Artisan Technology Group is not an affiliate representative or authorized distributor for any manufacturer listed herein We re here to make your life easier How...

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