Apparatus and method for fiber optics communication with dark current correction
US5119224A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 1989 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Dec 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/43
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The disclosure is directed to an apparatus and method for receiving and processing an optical signal representative of electronic information. In an embodiment of the invention there is provided a light-emitting diode which is reverse biased to receive the optical signal and convert the optical signal to an electronic signal. Means are provided for determining time periods during which the electronic signal produced by the light-emitting diode is below a predetermined threshold. Means are provided for generating a dark current error signal indicative of a sampled output of the light-emitting diode during said time periods. Means are also provided for holding the error signal during other time periods when the electronic signal produced by the light-emitting diode is not below the predetermined threshold. Finally, means are provided for modifying the electronic signal produced by the light-emitting diode as a function of the held error signal to obtain an output electronic signal. In the disclosed embodiment, the light-emitting diode is reverse biased and coupled across an input of an operational amplifier which is arranged to produce an output voltage that depends upon the current …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.