Method and apparatus for digital polarization scrambling in coherent optical communication systems employing both transmit and receive digital signal processing
US9209900B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 2014 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Jun 16, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved method and apparatus for reducing performance degradation in optical fiber transmission system due to polarization mode dispersion and nonlinear polarization coupling. Digital polarization scrambling with transmit and receive digital signal processing is used to reduce these effects. By performing digital polarization scrambling on all possible states of polarization with respect to the two principle axes of an optical fiber, the SOP dependent penalty is averaged out. The invention also provides a method and apparatus for performing digital polarization scrambling on the transmit side and blinded polarization tracking or synchronized polarization descrambling at the receive side. Using a configurable scrambling speed, the invention works as a polarization scanner low speed SOP rotation or as a scrambler at fast SOP rotation speeds. Synchronization of the transmit scramble and the receive descrambler is achieved with scrambling and descrambling control modules based on a common pseudo random bit sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.