High channel density wavelength division multiplexer with defined diffracting means positioning
US4926412A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1988 |
| Grant date | May 15, 1990 |
| Priority date | — |
| Expiry date | Feb 22, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/29311
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wavelength division multiplexer/demultiplexer having optical path lengths between a fiber array and a Fourier transform lens, and between a dispersion grating and the lens equal to the focal length of the lens. The optical path lengths reduce losses due to angular acceptance mismatch in the multiplexer. Close orientation of the fiber array about the optical axis and the use of a holographic dispersion grating reduces other losses in the system. Multi-exposure holographic dispersion gratings enable the multiplexer/demultiplexer for extremely broad-band simultaneous transmission and reflection operation. Individual Bragg plane sets recorded in the grating are dedicated to and operate efficiently on discrete wavelength ranges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.