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New Focus 1544-B, User Manual

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New Focus 1544-B User Manual Download Page 21

 

20 • Appendix III: Inside the Photoreceiver

NEW FOCUS, Inc.

 

Figure 3:

 

Simplified

schematic of

the Models

1544-B,

1554-B, and

1580-B

photoreceiver

 

modules

Switch

AC

DC

Photodiode

Microwave

Output

Connector

V+

Bias
Monitor

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

Summary of Contents for 1544-B

Page 1: ...nderutilized 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 ow...

Page 2: ...ected even to small discharges Ground your self adequately prior to handling these receivers or making connections A ground strap provides the most effective grounding and minimizes the likelihood of electrostatic damage 2584 Junction Ave San Jose CA 95134 1902 USA phone 408 919 1500 e mail contact newfocus com www newfocus com Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOU...

Page 3: ...d and does not cover incidental or consequential loss Information in this document is subject to change without notice Copyright 2003 2002 1998 New Focus Inc All rights reserved The logo and NEW FOCUS Inc are registered trademarks of NEW FOCUS Inc Document Number 155403 Rev A Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 4: ...t 8 Troubleshooting 9 Testing the Photodiode 9 Checking the DC Offset Voltage 9 Basic Optical Test 10 Characteristics 11 Characteristics 11 Responsivity 12 Customer Service 13 Technical Support 13 Service 13 Appendix I Optical Fiber Performance 15 Appendix II Microwave Connectors 17 Appendix III Inside the Photoreceiver 19 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE w...

Page 5: ...4 Contents NEW FOCUS Inc Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 6: ...54 consist of InGaAs photodiodes Model 1580 features a GaAs photodiode The small size of the module allows you to connect it directly to your test instrument or amplifier This eliminates the need to follow the photoreceiver with coaxial cable which can seriously distort picosecond pulses and attenuate microwave signals Figure 1 Models 1544 B 1554 B and 1580 B photoreceiver modules FC connector Bia...

Page 7: ...ply and Bias 1 Prior to handling the detector ground yourself with a grounding strap to prevent electrostatic damage to the receiver 2 Connect the power cable to the power supply Two power cables were included with the receiver use the appropriate cable for your power supply Connecting to a New Focus power supply Use the cable with the two round microconnectors Connect one end of the cable to one ...

Page 8: ...ope or spectrum ana lyzer or to another 50 Ω load If necessary use a high frequency cable best performance is achieved without a cable 2 To avoid connector damage and signal distortion be sure that the cable and the instrument you intend to connect to the module have compatible connectors See Appendix II Microwave Connectors on page 17 for a list of compatible connectors 3 These photoreceivers hav...

Page 9: ... single mode or 50 125 µm multimode fiber 1 Before connecting the photoreceiver measure the power in the fiber to ensure it is within the safe operating range For a pulsed input determine the maximum peak power You may want to use the New Focus Model 2011 FC 200 kHz Photoreceiver for this purpose it has a higher maximum pulse power and has the sensitivity to aid in fiber alignment 2 Connect the fi...

Page 10: ...t to diagnose If the response from your receiver is lower than you expect contact New Focus to arrange for a repair see Customer Service on page 13 Checking the DC Offset Voltage 1 With no light on the photodetector turn the detector on 2 Use a voltmeter to measure the Bias Monitor output voltage This voltage is the DC offset plus dark current 3 If the output is 5 mV then the detector is probably ...

Page 11: ...ltmeter 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 as shown in Figure 2 and G is the amplifier s transimpedance gain V A The gain of the bias monitor port is 1000 V A If the...

Page 12: ... W 0 6 A W 0 4 A W Transimpedance Gain 1000 V A 1000 V A 1000 V A Output Impedance 50 Ω 50 Ω 50 Ω Minimum NEP 100 pW 33 pW 50 pW DC Bias Monitor Bandwidth 50 KHz 50 KHz 50 KHz DC Bias Monitor Transimpedance Gain 1 V mA 1 V mA 1 V mA Cw Saturation Power 3 mW 1 mW 1 5 mW Power Requirements 15V 200 mA Model 0901 recommended 15V 200 mA Model 0901 recommended 15V 200 mA Model 0901 recommended Optical I...

Page 13: ... shown below Figure 2 Responsivity vs wavelength for Models 1544 B 1554 B and 1580 B Responsivity A W 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 Wavelength nm Model 1580 Model 1544 Model 1554 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 14: ... Technical Support and know the model number of your photoreceiver Phone 408 919 1500 Fax 408 980 8883 Support is also available by email techsupport newfocus com We typically respond to email within one business day Service In the event that your photoreceiver malfunctions or becomes damaged please contact New Focus for a return authorization number and instructions on shipping the unit back for ...

Page 15: ...14 Customer Service NEW FOCUS Inc Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 16: ...a fiber with a core 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 f3 dB where L is the fiber length in kilometers M is the material dispersion in ps nm x km and λ is the linewidth of the optical source in nm This b...

Page 17: ...16 Appendix I Optical Fiber Performance NEW FOCUS Inc Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 18: ...ble lists a few connectors and the frequency ranges in which they may be used For more information request Application Note 1 If you use an intervening coaxial cable select a cable with sufficiently low loss in the frequency range of interest Connector Frequency Range Compatibility BNC DC 2 GHz SMA DC 18 GHz Wiltron K 3 5 mm 3 5 mm DC 34 GHz SMA Wiltron K Wiltron K DC 40 GHz SMA 3 5 mm 2 4 mm DC 5...

Page 19: ...18 Appendix II Microwave Connectors NEW FOCUS Inc Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 20: ...t from the front panel connector to the microwave housing with a single mode SM 9 µmcorefiber Models1544 Band1554 B a multimode MM 62 5 µm core fiber Model 1580 B or a multimode 50 µm core fiber 50 models Although 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 1 meters long T...

Page 21: ...Inc Figure 3 Simplified schematic of the Models 1544 B 1554 B and 1580 B photoreceiver modules Switch AC DC Photodiode Microwave Output Connector V Bias Monitor Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 22: ...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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