Method and apparatus for deskewing WDM data transmitted through a dispersive medium
US4677618A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 1985 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Apr 4, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0307
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
When a byte of digital data is transmitted through a dispersive medium using frequency or wavelength division multiplexing (WDM) techniques, individual bits in the byte are normally delayed different amounts of time. This is referred to as bit skew. WDM apparatus is described along with a system for deskewing WDM data received after transit through a dispersive medium. Two bits in a given byte of data are detected. The relative times of arrival of the remaining bits in a byte are predicted using the relative delay between the two detected bits and the known frequency-related dispersion characteristics of the transmission medium. Certain bits in each received byte may be delayed using clock delay lines or registers to reduce the amount of time skew between the various bits in a byte.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.