Methods and apparatus for generating polarization mode dispersion
US6847484B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Feb 1, 2002 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Feb 1, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/05
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Methods and apparatus for coherent polarization mode dispersion generation are provided. A generator can include at least four birefringent stages. The birefringent stages are in optical series, and each includes a differential group delay (“DGD”) element. The intermediate stages' DGD elements are harmonic. Also, these intermediate stages each include a phase-shifting element. The generator can also include a polarization mode-mixing apparatus and a variable phase-shifting apparatus. The mode-mixing apparatus is capable of inducing polarization mode-mixing between at least one pair of adjacent stages to generate DGD and second order PMD independently at at least one optical frequency. The variable phase-shifting apparatus can include a phase-shifting controller coupled to each of said phase-shifting elements. A graphical user interface for PMD emulation, a PMD compensator for reducing PMD impairment, and calibration methods are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.