Optical receiver for an optical communication

Amplifiers – With semiconductor amplifying device – Including atomic particle or radiant energy impinging on a...

Reexamination Certificate

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C330S278000, C330S086000

Reexamination Certificate

active

07358818

ABSTRACT:
The present invention provides an optical receiver operable for optical signals each having different transmission speed. The optical receiver includes a light-receiving device, a pre-amplifier, a main amplifier, and a control circuit. The pre-amplifier, may be a trans-impedance amplifier, includes a parallel connection of a switching device and a resistor in a trans-impedance or a load element. By switching ON/OFF the switching device, the gain and the bandwidth of the pre-amplifier may be changed. By providing a filter circuit, whose cut-off frequency may be switched, in the main amplifier, the bandwidth of the optical receiver may be varied.

REFERENCES:
patent: 5302911 (1994-04-01), Miyashita
patent: 5363064 (1994-11-01), Mikamura
patent: 5382920 (1995-01-01), Jung
patent: 5589682 (1996-12-01), Brown et al.
patent: 6246284 (2001-06-01), Nemoto
patent: 6303922 (2001-10-01), Kasper
patent: 6972880 (2005-12-01), Kanesaka
patent: 6989717 (2006-01-01), Nogami et al.
patent: 2004/0145799 (2004-07-01), Sedic
patent: 09-232877 (1997-09-01), None
patent: 10-150417 (1998-06-01), None

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