Software-based electro-optic modulator bias control systems and methods
US7903981B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2007 |
| Grant date | Mar 8, 2011 |
| Priority date | — |
| Expiry date | Jan 7, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/21
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention provides a software-based electro-optic modulator bias control system resident in an optical transceiver including an electro-optic modulator that includes an optical-to-electrical converter including a transimpedance amplifier, an analog-to-digital converter, and a software algorithm, wherein the software algorithm is operable for determining an optimum bias voltage applied to the electro-optic modulator by discovering a maximum average optical power transmitted by the electro-optic modulator, or quadrature point, wherein the quadrature point is discovered by determining at what bias voltage the slope of an average optical power transmitted by the electro-optic modulator, defined as an optical power change given an incremental bias voltage change, is equal to zero. The software-based electro-optic modulator bias control system also includes a control loop operable for determining if a radio frequency port of the electro-optic modulator is driven to a peak-to-peak voltage that is greater than (over-driven) or less than (under-driven) the peak-to-trough voltage of a response curve of the electro-optic modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.