New Focus 1580-A, Руководство пользователя

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16 • Appendix II: Inside the Photoreceiver NEW FOCUS, Inc.
Appendix II:
Inside the Photoreceiver
A gold-plated microwave housing inside the
photoreceiver module contains the high-frequency
circuitry. This housing is bolted to a printed-circuit
board which regulates the bias for the photodiode and
amplifies the DC photocurrent for the monitor port.
The optical signal is brought from the front-panel
connector to the microwave housing with 62.5-µm-
core multimode fiber.
Figure 3:
Simplified
schematic of
the Model
1580-A
photoreceiver
module
Microwave
Housing
Photodiode
Microwave
Output
Connector
V
+
V
+
Bias Monitor
Instrumentation
Amp
1580-A Rcvr revA.fm Page 16 Friday, May 10, 2002 3:07 PM