Dense wavelength division multiplexer and demultiplexer devices

Details Dense wavelength division multiplexer and demultiplexer devices Dense wavelength division multiplexer and demultiplexer devices

1996-06-19

1998-05-05

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359127, 385 37, H04J 1402

Patent

active

057483507

ABSTRACT:
Multiplexer and demultiplexer devices for Dense WDM networks are described. The devices use an optical circulator, a plurality of bandpass wavelength division units and fiber Bragg gratings arranged in the optical fibers interconnecting the optical circulator and the bandpass wavelength division units. The optical circulator is connected to a network optical fiber and the bandpass wavelength division units are connected to a plurality of input/output optical fibers. Each fiber Bragg grating has a narrow wavelength reflection band about a predetermined wavelength and is arranged so that optical signals at wavelengths differing from predetermined wavelengths of the first optical fibers connected to a bandpass wavelength division unit are blocked and reflected. Depending upon the direction of the optical circulator, the device may be a multiplexer or a demultiplexer. Alternatively, a 3dB optical coupler may be used in place of the optical circulator with a corresponding rearrangement of the fiber Bragg gratings.

REFERENCES:
patent: 4880289 (1989-11-01), Imoto et al.
patent: 5457760 (1995-10-01), Mizrahi
patent: 5608825 (1997-03-01), Ip
patent: 5623565 (1997-04-01), Blair et al.

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