Bias control in an optical modulator and transmitter
US8543010B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2011 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Mar 25, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/572
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for controlling bias in an optical modulator is disclosed. The method is particularly applicable to controlling multi-wavelength modulators and wavelength-tunable transmitters. At a calibration stage, a desired optical performance of the modulator is achieved, and an amplitude of a peak-to-peak variation of the output optical signal at a pre-determined amount of dither is stored in a memory as a reference. At operating stage, a controller of the optical modulator adjusts a bias voltage of the modulator until the measured peak-to-peak optical signal variation matches the reference value stored at the calibration stage. For multi-wavelength modulators and tunable transmitters, the calibration is repeated at each wavelength, and corresponding peak-to-peak optical signal variations are stored in the memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.