Method and device for controlling bias of optical modulator
US7899338B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2004 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Nov 3, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/58
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and device for adequately controlling the DC bias of each of the optical modulating sections of an optical modulator even while the optical modulator is operating in normal mode and even with a simple structure. An optical modulator bias controller (B) for controlling the DC bias of each optical modulating section of an optical modulator (1) is characterized by comprising DC bias application means (3) for applying a DC bias to each of the optical modulating sections, a low-frequency signal superimposing circuit (2) for superimposing a low-frequency signal fB with a specific frequency on a modulating signal b applied to each optical modulating section, optical sensing means (9) for sensing a change of the intensity of the light wave passing through the combining section, and bias control means (4) for extracting the change of the intensity of light corresponding to the low-frequency signal from the optical sensing means and controlling the DC bias application means according to the extracted change of the intensity of light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.