| 摘要 |
An optical receiver is designed to suppress an unwanted intensity modulation component present in the optical signal at a polarization scrambling frequency or a monitoring control signal frequency, usually at about 10 kHz. It comprises an optical-to-electrical converter 2 for converting an optical main signal to an electrical signal; an optical amplifier 1 for amplifying the optical main signal to the optical to electrical converter; an electrical amplifier 3 for amplifying the converted electrical signal from the optical-to-electrical converter to produce a main signal and capacitors 8 and 9 connected to or in the electrical amplifier and forming part of a filter with a low cut-off frequency, higher than the polarization scrambling frequency or the monitoring control signal frequency.
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