Method and apparatus for compensating differential group delay
US6546159B1 · kind B1 · utility
9Cited by
4References
22Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 22, 2002 |
| Grant date | Apr 8, 2003 |
| Priority date | — |
| Expiry date | Aug 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/2861
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved digital differential group delay (DGD) controller is capable of producing variable DGD used to compensate for DGD in a fiber optic link in real time. The DGD controller comprises one or more sets of a polarization modulator optically coupled with a fixed delay component, such as a birefringent plate. Each set provides an amount of DGD compensation. By controlling the number of stages in the controller, the amount of DGD compensation provided by each stage, and which stages are placed in the ON state, the total amount of DGD compensation provided by the digital DGD controller can be varied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.