New Focus 141 series User Manual Download Page 3

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TABLE OF CONTENTS

141522 Rev.D

HANDLING PRECAUTIONS ..............................................................3

QUICK START ........................................................................................4

INTRODUCTION ..................................................................................5

OPERATION ..........................................................................................6

APPENDIX 1: USING AN OPTICAL FIBER ..................................10

APPENDIX 2: USING THE CORRECT

MICROWAVE CONNECTOR..................................11

APPENDIX 3: INSIDE THE PHOTODETECTOR MODULE ......12

TROUBLESHOOTING........................................................................13

DETECTOR CHARACTERISTICS ....................................................16

WARRANTY, SERVICE & SUPPORT ..............................................18

Is a registered trademark of

New Focus, Inc.

Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Summary of Contents for 141 series

Page 1: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

Page 2: ... 143X 144X 145X USER S MANUAL F I B E R C O U P L E D U L T R A H I G H S P E E D P H O T O D E T E C T O R M O D U L E S Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 3: ...AL FIBER 10 APPENDIX 2 USING THE CORRECT MICROWAVE CONNECTOR 11 APPENDIX 3 INSIDE THE PHOTODETECTOR MODULE 12 TROUBLESHOOTING 13 DETECTOR CHARACTERISTICS 16 WARRANTY SERVICE SUPPORT 18 2 Is a registered trademark of New Focus Inc Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 4: ...e Models 141X and 144X are high speed InGaAs photodetector modules for detection of light of wavelengths 950 to 1650 nm The 143X and 145X are high speed InGaAs photodetector modules for detection of light of wavelengths 400 to 1650 nm All the models are 50 Ω terminated An internal battery and bias circuitry make the modules self contained so that no additional power supplies or bias circuitry are ...

Page 5: ...ector The instrument must have a 50 Ω input impedance 8 Check that the optical power emerging from your fiber is below the Max Pulse Power or cw Saturation Power as appropriate see the Detector Characteristics section of this manual to ensure detector linearity and to avoid detector damage 9 Connect your optical fiber to the connector on the detector module 10 When finished using the module turn o...

Page 6: ... voltage New Focus offers a total of eight models allowing you to match your wavelength of interest and the connector style of your instru mentation The Models 141X and 144X are high speed InGaAs photodetector modules for detection of light of wavelengths 950 to 1650 nm and the Models 143X and 145X are also high speed InGaAs photodetectors designed for 400 1650 nm operation Models 141X and 143X ar...

Page 7: ...ess than 10 mV 5 If needed keep the voltmeter connected to the module to optimize coupling to the fiber Making the Microwave Connection Connect the microwave output connector of the photodetector module to a 50 Ω input test instrument such as an oscilloscope or spectrum analyzer or other 50 Ω load using the proper torque To avoid connector damage and signal distortion be sure that the instrument y...

Page 8: ...Model 9016 tiny fiber positioner 2 Measure the power in the fiber prior to connection to the module to be sure it is within the safe operating range see the Detector Characteristics section of this manual The Models 20X1 FC and 20X1 ST are useful for this purpose and have the sensitivity to aid in fiber alignment 3 Connect the fiber optic cable to the fiber optic input on the detector module The B...

Page 9: ... 1223 pigtail FC assembly 2 meters for 1434 1454 1 1 to 1 6 µm wavelength Model 1232 pigtail FC assembly 2 meters for 1414 1444 1 1 to 1 6 µm wavelength Model 1222 ST FC 2 meters These assemblies are available from New Focus Collimators require an Opti Claw tilt mount such as the Model 9854 Pigtail assemblies require a fiber aligner such as the Model 9091 Other wavelengths and beam types Patch Cab...

Page 10: ... Switch Battery Check Button When depressed bias voltage is applied to bias monitor port 2 00 50 8 Remove two screws to replace 9V battery 2 00 50 8 3 27 82 9 2 25 57 1 Bias monitor port Output is equal to photodiode current times 1000 ohms for one millivolt per microamp Output K connector Shown with ST connector for optic input 1411 ST connector 1414 FC connector 1431 ST connector 1434 FC connect...

Page 11: ...small enough that only a single mode will propagate In this case the bandwidth of the fiber will be limited by material dispersion which is a property of the glass used in the fiber core In this limit the bandwidth is approximately ƒ3 dB 1 2LM λ where L is the fiber length in kilometers M is the material dispersion in ps nm km and λ is the line width of the optical source in nm This bandwidth limi...

Page 12: ...improper adapter is chosen for mating to the instrument Common SMA connectors for example are intended for use to only 18 GHz Table 2 is a list of a few con nectors and the frequency range in which they may be used Table 2 Common RF connectors and the corresponding frequency ranges in which they are useful 11 Connector Type Frequency Range Compatibility BNC DC 2 GHz SMA DC 18 GHz Wiltron K 3 5 mm ...

Page 13: ...though the material and modal dispersion per unit length of this fiber can be high at certain wavelengths there is no degradation in frequency response since the fiber is only 0 2 meters long The fiber is protected by a sheet metal flange to prevent damage while changing the battery A simplified schematic is provided in Fig 2 for your reference Fig 2 Simplified schematic diagram of the 141X 143X 1...

Page 14: ...use an apparent degradation of responsivity See Basic Optical Test below Tests Procedures and Solutions DC Offset Voltage With no light on the photodetector turn the detector on and use a voltmeter to measure the Bias Monitor output voltage This voltage is the DC offset plus dark current If the output is 10 mV then the detector is probably damaged and will need to be returned to New Focus Checking...

Page 15: ...r or oscilloscope you should observe a DC output voltage If you know the optical power and wavelength you can calculate the expected output voltage Vout using the expression Vout Pin R G where Pin is the input optical power watts R is the photodetector s responsivity A W and G is the amplifier s transimpedance gain V A The gain of the bias monitor port is 1000 V A If the output voltage appears to ...

Page 16: ... 5 Remove the two screws on the bottom of the detector using an Allen key 1 16 or 1 5 mm and carefully slide the detector housing off Steps 6 8 Be extremely careful not to pull on the fiber Stress applied to the fiber where it attaches to the microwave hous ing can cause the fiber to misalign from the photodiode resulting in degraded detector performance 6 Carefully disconnect the fiber connector ...

Page 17: ...ion Power 2 mW 10 mW 2 mW 10 mW Max Pulse Power 100 mW 200 mW 100 mW 200 mW Detector Material InGaAs InGaAs InGaAs InGaAs Detector Type Schottky Schottky Schottky Schottky Detector Diameter 25 µm 25 µm 25 µm 25 µm Power Requirements 9 V battery 9 V battery 9 V battery 9 V battery Optical Input ST FC ST FC ST FC ST FC Bias Monitor DC Gain 1 mV µA 1 mV µA 1 mV µA 1 mV µA DC Offset 10 mV 10 mV 10 mV ...

Page 18: ...and145X and b Models 141X and 144X Responsivity increases from 0 0 52 A W over the range of 950 970 nm Wavelength nm Responsivity A W 300 500 700 900 1100 1300 1500 1700 0 0 0 2 0 4 0 6 a b Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 19: ... 00 5 00 PST Monday through Friday excluding holidays For quickest response ask for Technical Support and know the model number for your product Phone 408 980 8088 Fax 408 980 8883 Support is also available by email Email techsupport newfocus com We typically respond to email within one business day SERVICE In the event that your translation stage malfunctions or becomes damaged please contact New...

Page 20: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

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