Optical receiver circuit
US5329115A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1993 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Apr 29, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/6931
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical receiver circuit for receiving optical signals is described incorporating a photodetector, two coupling capacitors for coupling each side of the photodetector to respective inputs of a transimpedance amplifier, two current mirror circuits for detecting current on each side of the coupling capacitor and injecting equivalent current to the other side of the other capacitor which is at the input of the transimpedance amplifier, two low pass filters, two current sources and a transimpedance amplifier having two inputs. An optical receiver for receiving optical signals is described incorporating a photodetector having one side coupled to a reference voltage, a current source, a coupling capacitor, a transimpedance amplifier, and a circuit for injecting AC current to the input of the amplifier from the voltage developed across the photodetector. The invention overcomes the problem of requiring large coupling capacitors in an optical receiver circuit to accommodate a low bandwidth due to a long string of 1's or 0's.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.