Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-03-24
2000-06-06
Chan, Jason
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359190, 359161, 359158, H04B 1008, H04B 1006, H04B 1000
Patent
active
060726091
ABSTRACT:
A light-receiving circuit converts an optical signal to be processed which is introduced from an optical signal introducing portion, into first and second electrical signals corresponding to the optical signal, and outputs them. The light-receiving circuit includes first and second negative-feedback differential DC amplifying circuits, a photodiode, and a bias power supply circuit. Each of the DC amplifying circuits outputs a voltage proportional to a current flowing through the inverting input terminal from the output terminal. The photodiode has an anode, a cathode, and a light input portion. The anode is directly connected in a DC manner to the inverting input terminal of one of the DC amplifying circuits, and the cathode is directly connected in a DC manner to the inverting input terminal of the other DC amplifying circuit. The photodiode flows from the cathode to the anode a light reception current corresponding to the optical signal to be processed which is input to the light input portion. The bias power supply circuit applies a bias voltage to the non-inverting input terminal of at least one of the first and second DC amplifying circuits so as to set the potential of the cathode of the photodiode higher than that of the anode.
REFERENCES:
patent: 4586186 (1986-04-01), Anderson
patent: 5210712 (1993-05-01), Saito
patent: 5535038 (1996-07-01), Hinch
Anritsu Corporation
Bello Agustin
Chan Jason
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