Light receiving device
US5912756A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 1996 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | Oct 31, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/675
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
To enable the filtering of a light signal without using an optical bandpass filter, the present invention provides the following construction: a light signal transmitted through an optical fiber enters an injection-locked laser device which is locked to the wavelength of the light signal to oscillate synchronously with the light signal; the locked light signal enters a light frequency discriminator to transform the frequency-modulated signal into an intensity modulated signal, and it enters a light receiver to be demodulated. Since the injection-locked laser device emits only a locked oscillation light signal, the received light signal can be extracted without using an optical bandpass filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.