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New Focus 1580-A User Manual

12-ghz amplified photoreceivers
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U S E R ' S G U I D E
12-GHz Amplified
Photoreceivers
Model 1580-A
These photoreceivers are sensitive to electrostatic
discharges and could be permanently damaged if
subjected 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.
5215 Hellyer Ave. • San Jose, CA 95138-1001 • USA
phone: (408) 284–6808 • fax: (408) 284–4824
e-mail: contact@newfocus.com • www.newfocus.com

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Summary of Contents for New Focus 1580-A

  • Page 1 U S E R ’ S G U I D E 12-GHz Amplified Photoreceivers Model 1580-A These photoreceivers are sensitive to electrostatic discharges and could be permanently damaged if subjected even to small discharges. Ground your- self adequately prior to handling these receivers 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. Information in this document is subject to change without notice.

  • Page 3: Table Of Contents

    Contents Operation Introduction ......... . . 5 Handling Precautions .
  • Page 4 4 • Contents NEW FOCUS, Inc.

  • Page 5: Operation

    Model 1580-A ideal for digital communication measurements. The Model 1580-A has a negative conversion gain due to the inverting amplifier used. If you are using an 12-GHz Photoreceivers Operation • 5...

  • Page 6: Handling Precautions

    Figure 1: Bias-monitor port—output is equal to photodiode current Model 1580-A times 1000 Ω, for 1 mV/µA. photoreceiver Output K-connector module 2.25 (57.1) Power switch 2.00 (50.8) Batt 2.00...

  • Page 7: Microwave Connection And Set-Up

    Connecting to a New Focus power supply: Use the cable with the two round microconnectors. Connect one end of the cable to one of the power supply’s 300-mA outputs.

  • Page 8: Connecting The Receiver To The Optical Input

    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.

  • Page 9: Characteristics

    Characteristics Photoreceiver Characteristics Model # 1580-A Wavelength Range 400–870 nm 3-dB Bandwidth 12 GHz (typical) (electrical) 10 GHz (minimum) Low-Frequency Cutoff 10 kHz Rise Time 34 ps Conversion Gain –400 V/W Responsivity 0.4 A/W Transimpedance Gain 1000 V/A 50 Ω...

  • Page 10: Bias-Monitor Characteristics

    5 mV Output Impedance 10 kΩ Bandwidth 50 kHz Responsivity A graph of the typical and predicted responsivity of the Model 1580-A is shown below. Figure 2: Responsivity vs. wavelength for Model 1580-A Wavelength, nm 10 • Characteristics NEW FOCUS, Inc.

  • Page 11: Troubleshooting

    Offset Voltage,” below. Other problems, such as a damaged amplifier, are more difficult 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).

  • Page 12: Basic Optical Test

    (A/W, see page 10), 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 is low, then contact New Focus to arrange for a repair (see “Customer Service” on page 13).

  • Page 13: Customer Service

    Customer Service Technical Support Information and advice about the operation of any New Focus product is available from our applications engineers. For quickest response, ask for “Technical Support” and know the model and serial numbers for your product. Hours: 8:00–5:00 PST, Monday through Friday (excluding holidays).
  • Page 14 14 • Customer Service NEW FOCUS, Inc.

  • Page 15: Appendix I: Microwave Connectors

    Appendix I: Microwave Connectors The performance you obtain from the Model 1580-A photoreceiver depends largely on the instruments you use to measure their outputs and how the connections are made to the instruments. Connect the male connector of the photoreceiver directly to the female connector of the instrument.

  • Page 16: Appendix Ii: Inside The Photoreceiver

    The optical signal is brought from the front-panel connector to the microwave housing with 62.5-µm- core multimode fiber. Figure 3: Microwave Microwave Simplified Housing Output Connector schematic of the Model 1580-A photoreceiver module Photodiode Bias Monitor Instrumentation 16 • Appendix II: Inside the Photoreceiver NEW FOCUS, Inc.

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