Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-11-07
1993-10-12
Chilcot, Jr., Richard E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359154, 359181, 307268, 375 60, 358186, H04B 1000, H04B 1004
Patent
active
052530965
ABSTRACT:
An optical transmitter and receiver for use in a fiber optic LAN and characterized by reduced pulse-width distortion, low noise, simplicity of design, and advantageous use of widely-available low-cost components. Pulse-width distortion of an optical transmitter is reduced using a pulse input and conditioning circuit that maintains the optical source in an ON state when the injected pulse energy subsides for a time closely approximating the source's turn-on delay. A pre-amplifier portion of an optical receiver is of the transimpedance type, having a low-noise first stage and a moderate-gain second stage connected to the first stage by a feedback resistance on the order of a few kilo-ohms. The low impedance of the feedback resistor minimizes thermal noise, whereas the moderate gain of the second stage still allows a high transimpedance to be achieved. A simple, single-transistor LO-LITE circuit is also disclosed.
REFERENCES:
patent: 3614447 (1971-10-01), Paoli et al.
patent: 4759080 (1988-07-01), Emura et al.
patent: 4850046 (1989-07-01), Philippe
Freeman William R.
Patel Bhavesh
Chilcot Jr. Richard E.
Negash Kinfe-Michael
Raylan Corporation
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