Bias controller
US8203777B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2008 |
| Grant date | Jun 19, 2012 |
| Priority date | — |
| Expiry date | May 28, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/60
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A bias controller and a method for controlling the bias of an electro-optic modulator are provided. In the method, for a received indication of modulator temperature, steps are provided for accessing a look-up table to determine a corresponding value of bias voltage, for a required bias point, to apply to the modulator. If no such value is stored, additional steps are provided to generate a pilot tone for input to the modulator and to recognize, from the signal content of a modulated optical signal output by the modulator, operation of the modulator at the required bias point, adjusting the value of bias voltage being applied to the modulator as required. When operation at the required bias point is recognized, the respective value of bias voltage for that modulator temperature is stored in the look-up table. The same method is provided to configure a bias controller in respect of a given modulator, if necessary ab initio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.