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U S E R ' S G U I D E
15-GHz & 25-GHz
Photodetectors
Models 1480 & 1481
Includes Model 1481-50
These photodetectors are sensitive to electrostatic
discharges and could be permanently damaged if
subjected even to small discharges. Ground your-
self adequately prior to handling these detectors or
making connections. A ground strap provides the
most effective grounding and minimizes the
likelihood of electrostatic damage.
NEW FOCUS, Inc.
®
2630 Walsh Ave.• Santa Clara, CA 95051-0905• USA
phone: (408) 980-8088 • Fax: (408) 980-8883
e-mail: contact@newfocus.com • www.newfocus.com
®
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Table of Contents
Related Manuals for New Focus 1480
Summary of Contents for New Focus 1480
- Page 1 U S E R ’ S G U I D E 15-GHz & 25-GHz Photodetectors Models 1480 & 1481 Includes Model 1481-50 These photodetectors are sensitive to electrostatic discharges and could be permanently damaged if subjected even to small discharges. Ground your- self adequately prior to handling these detectors or making connections.
- Page 2 Warranty New Focus, Inc. guarantees its products to be free of defects for one year from the date of shipment. This is in lieu of all other guarantees, expressed or implied, and does not cover incidental or consequential loss. Copyright 2000, New Focus, Inc. All rights reserved.
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Page 3: Table Of Contents
Contents Operation Introduction ......... . . 5 Handling Precautions . - Page 4 4 • Contents NEW FOCUS, Inc.
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Page 5: Operation
The Models 1480 and 1481 use a GaAs PIN photodiode designed for high responsivity in the 780–870-nm wavelength range. The high-speed circuitry produces a clean impulse response, making these models ideal for digital communication measurements. -
Page 6: Handling Precautions
Battery-check button— Bias-monitor port—output press to apply the photo- Models is equal to photodiode current diode bias voltage to times 1000 Ω, for 1 mV/µA. 1480 & 1481 the bias-monitor port. Output K-connector photodetector 2.25 (57.1) Power switch 2.00 (50.8) -
Page 7: Quick Start
Quick Start Use the Models 1480 and 1481 high-speed GaAs photodetector modules for detecting light in the wavelength range from 400 to 870 nm. Each module is 50-Ω terminated and has an internal battery and bias circuitry to make it self-contained—no additional power supply or bias circuitry is needed. -
Page 8: Checking The Battery And Offset Voltage
1. Turn off the module and remove the two screws on the back panel with a Phillips screwdriver. (See Figure 1 on page 6.) 2. Remove the back panel and replace the battery. 3. Replace the back panel. 8 • Operation NEW FOCUS, Inc. -
Page 9: Making The Microwave Connection
4. Check the battery level as described above. Making the Microwave Connection 1. Connect the photoreceiver module’s microwave connector to a test instrument that has a 50-Ω input, such as an oscilloscope or spectrum ana- lyzer, or to another 50-Ω load. If necessary, use a high-frequency cable (best performance is achieved without a cable). - Page 10 10 • Operation NEW FOCUS, Inc.
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Page 11: Characteristics
Characteristics Photodetector Characteristics The values below are given at 850 nm. Model # 1480 1481 Wavelength Range 400–870 400–870 3-dB Bandwidth 15 GHz 25 GHz Rise Time 25 ps 15 ps Conversion Gain 10 V/W 10 V/W Responsivity 0.4 A/W 0.4 A/W... -
Page 12: Bias-Monitor Characteristics
10 kΩ 10 kΩ Bandwidth 50 kHz 50 kHz Responsivity A graph of the typical and predicted responsivity of the Models 1480 and 1481 is shown below. Figure 2: Responsivity vs. wavelength for Models 1480 & 1481 Wavelength, nm 12 • Characteristics... -
Page 13: Troubleshooting
3. If the output is >10 mV, then the detector is probably damaged and will need to be returned to New Focus. If the output is <10 mV, then perform the Basic Optical Test described below. Basic Optical Test To quickly test the photodiode in your receiver, run this simple DC optical test. -
Page 14: Cleaning The Fiber Connector
If the output voltage is low, then the fiber connector may be dirty (see “Cleaning the Fiber Connector,” below). If you suspect the unit is damaged, contact New Focus to arrange for a repair (see “Customer Service” on page 17). Cleaning the Fiber Connector The high-speed photodetectors have an internal fiber... - Page 15 help to remove any dust or dirt particles that might be blocking the input light. If more cleaning is needed, proceed with steps 3-8. 3. Wear a grounding strap. 4. Remove the two screws on the back panel with a Phillips screwdriver.
- Page 16 16 • Troubleshooting NEW FOCUS, Inc.
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Page 17: Customer Service
Customer Service Technical Support Information and advice about the operation of any New Focus product is available from our technical support engineers. Engineers are on duty from 8:00–5:00 PST, Monday through Friday (excluding holidays). For quickest response, ask for “Technical Support” and know the model number for your receiver. - Page 18 18 • Customer Service NEW FOCUS, Inc.
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Page 19: Appendix I: Microwave Connectors
DC–55 GHz Wiltron V Wiltron V DC–65 GHz 2.4 mm New Focus also offers the following adapters: Model 1225 Male-SMA to Female-BNC Model 1226 Female-SMA to Male-BNC Model 1227 40-GHz Flex Cable, Female-K to Male-K 15-GHz & 25-GHz Photodetectors Appendix I: Microwave Connectors • 19... -
Page 20: Appendix Ii: Inside The Photodetector
A simplified schematic is provided below. Figure 3: Microwave Microwave Housing Simplified Output Connector schematic of the Models 1480 & 1481 photodetector Photodiode – Bias modules Monitor Batt – On/Off 20 • Appendix II: Inside the Photodetector...