Optical receiver using Mach-Zehnder interferometer
US7995930B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 19, 2006 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | Feb 26, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0327
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention relates to an optical receiver, in which the transmittance of a Mach-Zehnder interferometer can be locked at a normal operation point in a simple structure and control. A transmittance detecting circuit and a minute modulation signal detecting circuit are provided in parallel after a balanced optical receiver, and a switch is selectively connectable either a minute modulation signal detecting circuit and a transmittance detecting circuit. In the initial stage of frequency pull-in, the switch is set to connect the transmittance detecting circuit to the synchronous detection circuit. If the transmittance detecting circuit detects that the transmittance of the Mach-Zehnder interferometer at the carrier frequency becomes a desired transmittance, the connection of the switch is switched from the transmittance detecting circuit to the minute modulation signal detecting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.