Optical modulator and optical modulation control method
US8761548B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 23, 2011 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Sep 13, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0123
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode for applying an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a modulation signal generator to generate the modulation signal of a first frequency; a superimposer to superimpose a signal of a second frequency different from the first frequency on the bias voltage; and a bias controller to control the bias voltage in a modulation direction of the modulator and the bias voltage in an orthogonal direction which is orthogonal to the modulation direction based on a phase of the second frequency component extracted from a modulated optical signal generated by the modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.