Optical modulator and optical modulation control method
US9244328B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2014 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Nov 14, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/212
- 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 to apply an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a driver circuit to generate a modulation signal in accordance with an input signal; a superimposer to superimpose a reference signal on the bias voltage, the reference signal having lower frequency than the modulation signal; and a controller to control a bias voltage in a direction orthogonal to a modulation direction of the modulator based on the frequency component of the reference signal extracted from a modulated optical signal generated by the modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.