Transport of multiple asynchronous data streams using higher order modulation
US8712251B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2011 |
| Grant date | Apr 29, 2014 |
| Priority date | — |
| Expiry date | Dec 7, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13361
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Aspects of the invention provide transmitters and receivers for managing multiple optical signals. High order modulation, such as phase and/or amplitude modulation, is used to achieve multiple bits per symbol by transporting multiple asynchronous data streams in an optical transport system. One or more supplemental multiplexing techniques such as time division multiplexing, polarization multiplexing and sub-carrier multiplexing may be used in conjunction with the high order modulation processing. This may be done in various combinations to realize a highly spectrally efficient multi-data stream transport mechanism. The system receives a number of asynchronous signals which are unframed and synchronized, and then reframed and tagged prior to the high order modulation. Differential encoding may also be performed. Upon reception of the multiplexed optical signal, the receiver circuitry may employ either direct detection without a local oscillator or coherent detection with a local oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.