Gain control for an optical modulator
US9104084B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2012 |
| Grant date | Aug 11, 2015 |
| Priority date | — |
| Expiry date | Dec 7, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
There is described an optical modulation system for transmitting modulated optical light. The system comprises an electro-optic modulator having at least two arms through which light is transmitted and an imbalance electrode located on at least one arm. A current source is configured to inject current into the imbalance electrode for modifying the phase of light passing through the arm. A dither generator is configured to modulate the injected current, or bias voltage applied to at least one of the arms, with a dither signal. A phase sensitive detector is configured to detect an error in the phase of light emitted by the modulator. An operating point controller is configured to monitor the detected phase error and adjust the current injected into the imbalance arm so as to compensate for the detected error and thereby control an operating point of the modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.