Differential optical signal receiver

Details Differential optical signal receiver Differential optical signal receiver

1998-03-18

2001-01-16

Negash, Kinfe-Michael (Department: 2733)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C250S2140AG, C330S308000

Reexamination Certificate

active

06175438

ABSTRACT:

TECHNICAL FIELD OF THE INVENTION
This invention relates to optical signal receivers and, more particularly, to a differential optical signal receiver having an interference-rejecting circuit.
BACKGROUND OF THE INVENTION
Optical signals are increasingly being used to communicate between electronic processing elements. In certain applications, large amounts of information need to be processed together, thereby creating a need to process many optical signals. If such processing is to be done electronically, it is necessary to convert large numbers of optical signals to electrical signals, and then to process the resulting electrical information. Particularly if this processing is done with integrated optical receiver arrays, the receiver is subject to interference from a wide range of potential sources. What is desired is an optical receiver having improved interference-rejection capabilities so as to reject the interference arising from various electronic sources.
SUMMARY OF THE INVENTION
The present invention is directed to solving the prior art interference problems using an a differential optical signal receiver having an interference-rejecting circuit.
More particularly, a differential optical signal receiver is disclosed comprising (1) a differential optical signal detector for detecting a received differential optical signal and converting it to a differential electrical signal and (2) a differential electrical circuit, including a common source load, for processing the differential electrical signal so as to reject any electrical interference signal other than the differential electrical signal. According to another aspect of the invention, the differential electrical circuit includes a differential transimpedance preamplifier connected to receive and amplify the differential electrical signal. In another aspect the differential electrical circuit further includes a differential amplifier circuit connected to receive output signals from the differential transimpedance preamplifier.
In one embodiment of the differential optical signal receiver, the differential electrical circuit and the differential amplifier circuit are integrated together on a common chip. The devices utilized in the chip may be Field Effect Transistors (FETs) which may be fabricated using Complementary Metal Oxide Semiconductor (CMOS) technology or other comparable Very Large Scale Integration (VLSI) technology.


REFERENCES:
patent: 5105293 (1992-04-01), Bortolini
patent: 5473461 (1995-12-01), Miremadi
patent: 5612810 (1997-03-01), Inami et al.
patent: 5822104 (1998-10-01), Saito
patent: 6064507 (2000-05-01), Heflinger et al.

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