Optical frequency shifter and transmission system
US6259836A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1998 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | May 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/0305
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical transmission system has an input light guide and N multipath modulators operated as frequency shifters connected in cascade to receive light from the input light guide and output light along N output light guides where N is 1 or more, wherein the light carried by each ith output light guide, where i=1, . . . , N, is shifted in frequency from light carried by the input light guide by i.omega..sub.m, and where each set of multipath modulators contributes a frequency translation of .omega..sub.m and where the light from each output light guide is modulated and combined with all other modulated output light to form a multiwavelength transmission system. A receiver equipped with similar frequency shifters is configured to generate a number of optical reference signals of frequencies .omega..sub.0 +i.omega..sub.m, each reference sign to be added as a separate portion of the received signal so as to perform self-homodyne detection of the information signal associated with each respective modulated frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.