Optical receiving device

Details Optical receiving device Optical receiving device

2007-01-02

2007-01-02

Singh, Dalzid (Department: 2613)

Optical communications

Receiver

C398S208000, C398S209000

Reexamination Certificate

active

10329834

ABSTRACT:
Provided is an optical receiving device which can achieve a wide dynamic range while keeping a constant extinction ratio against the changes in the input amplitude. A signal current of a light receiving element is converted to a signal voltage by an amplifier and the gain of the amplifier is regulated by a transistor. A DC voltage corresponding to the peak value of the signal current detected by a current detection circuit is outputted to a dummy current generating circuit. The resistance value of the transistor is controlled by a control voltage, which is outputted from an amplitude control circuit according to the difference between the DC voltage and a reference voltage, thereby to set the amplitude of the signal voltage converted by the amplifier to be invariable.

REFERENCES:
patent: 5777507 (1998-07-01), Kaminishi et al.
patent: 5875049 (1999-02-01), Asano et al.
patent: 6384689 (2002-05-01), Kimura
patent: 6476660 (2002-11-01), Visocchi et al.
patent: 07-235841 (1995-09-01), None
patent: 2000-252775 (2000-09-01), None
patent: 2000-312182 (2000-11-01), None

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