Browse Prior Art Database

Low Noise Optical Receiver

IP.com Disclosure Number: IPCOM000051442D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Haas, LC: AUTHOR [+2]

Abstract

The drawing discloses a wide bandwidth optical receiver with a high signal-to-noise ratio. The receiver has an electro-optic feedback loop to its input photodiode.

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Low Noise Optical Receiver

The drawing discloses a wide bandwidth optical receiver with a high signal- to-noise ratio. The receiver has an electro-optic feedback loop to its input photodiode.

Input signals are applied to a back biased PIN diode 10 through an optical fiber 12. The PIN diode 10 is connected to a high gain amplifier 14 to provide an output signal dependent on the current through diode 10. A feedback loop includes a high gain amplifier 14, a light-emitting diode (LED) driver 16, an LED 18 and (optionally) a light guide 20 for coupling the LED 18 to the PIN diode 10. The PIN diode 10 serves as a signal summing element.

The system can be implemented using silicon diodes and amplifier components with a GaAs light source in the feedback loop. Alternatively, the system could be implemented using a GaAs photodiode, FET amplifier and LED, all integrated on a single chip including the optical feedback light path. The gain of the receiver would be a function of optical path geometry, doping, etc., established during the manufacture of the chip.

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