Bias controller for an optical modulator
US8160456B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2007 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Nov 27, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/2255
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A bias controller for an optical modulator. The modulator includes a bias electrode that is operable when appropriately biased by an applied bias voltage to configure the modulator to operate at quadrature, and the bias controller includes: a generating arrangement for generating power signals indicative of the optical output power of the modulator; and a processor operably connected to the generating arrangement and said bias electrode and arranged to receive said power signals from said generating arrangement and to control the bias voltage applied to said bias electrode. The processor is configured to vary the bias voltage applied to said bias electrode and to determine from power signals received from said generating arrangement a peak optical output power for said modulator, and to determine in dependence upon said peak optical power a target optical power for quadrature with reference to a store of predetermined values for peak output power and respective corresponding values of target optical power for quadrature. Other embodiments relate to a multi-channel bias controller, and to a method for controlling voltage bias in a modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.