Digital pulse optical transmitter and receiver for local area network applications
US5253096A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 1991 |
| Grant date | Oct 12, 1993 |
| Priority date | — |
| Expiry date | Nov 7, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/673
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.