Encoder/decoder for optical CDMA
US7251397B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2006 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Jun 1, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An encoder according to the present invention is an encoder for encoding an optical wavelength-multiplexed signal compliant with optical CDMA into a code having a code pattern, including: L optical fibers 36 and 42 (where L is an integer equal to or greater than two) each having a plurality of gratings 37 to 47; and a circulator 52 for coupling the plurality of optical fibers 36 and 42. The code pattern contains time bins t1 to t3. A plurality of wavelengths λ1, λ4 and λ5 are assigned to the time bin t1. If a sum of an optical path difference in each optical fiber from the grating which reflects the optical signal of the wavelength λ1 to the grating which reflects the optical signal of the wavelength λ4 is calculated for all of the optical fibers 36 and 42, the sum equals zero.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.