Photodetector and optical receiver
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United States of America Patent
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Feb 5, 2008
Grant Date -
Jun 23, 2005
app pub date -
Dec 7, 2004
filing date -
Dec 17, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
An optical receiver is provided with an optical-signal-receiving section and a controlling section. The optical-signal-receiving section incorporates a photodetector. The photodetector has an APD. Through a passivation film, a photoconductor is placed on a portion of a surface of the APD which remains unoccupied by an optical-signal-receiving area of the APD. When this structure is employed, the signal for controlling the avalanche multiplication factor of the APD can be obtained from the photoconductor. Consequently, the signal can be obtained with a simple structure. Furthermore, the photoconductor has a good linearity of the output current even to a weak lightwave. As a result, the output current I for controlling the avalanche multiplication factor of the APD can be obtained with high accuracy.
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