Automatic DC bias control for the duobinary modulation format utilizing a low-pass electrical filter
US7034977B2 · kind B2 · utility
3Cited by
4References
12Claims
0Family size
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Key dates
| Filing date | Feb 9, 2004 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Feb 9, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/126
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and apparatus is provided for controlling the bias point of a Mach-Zehnder modulator. The method begins by applying a dither signal to a DC bias that is applied to a Mach-Zehnder modulator. A component of an optical output signal provided by the Mach-Zehnder modulator that is synchronous with the dither signal is detected. The dither signal is adjusted to maintain the detected component of the optical output signal at a substantially constant value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.