Optical add-drop multiplexer

Details Optical add-drop multiplexer Optical add-drop multiplexer

1997-02-10

1999-07-20

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359130, 385 37, H04J 1402

Patent

active

059263008

ABSTRACT:
The present invention is directed towards an optical ADM apparatus provided with a narrow band-pass filter which is capable of minimizing declination of the transmission characteristics. An optical transmission prohibiting element composed of an optical isolator and a fiber grating is connected in series to the downstream of a fiber grating interposed between two optical circulators. The drop light is reflected by the fiber grating and released from an output optical fiber of the optical circulator. A leak component of the drop light having passed through the fiber grating appears on the side of the isolator and runs across the isolator to the other fiber grating. Most of the leak component is however reflected by the fiber grating while its small portion enters the optical circulator via the fiber grating. The small portion of the leak component is as small as negligible and will hardly interfere with the add light. The optical transmission prohibiting element may be an optical circulator.

REFERENCES:
patent: 5283686 (1994-02-01), Huber
patent: 5467212 (1995-11-01), Huber
patent: 5600473 (1997-02-01), Huber
patent: 5633741 (1997-05-01), Giles
patent: 5726785 (1998-03-01), Chawki et al.
patent: 5748349 (1998-05-01), Mizrahi
"Evaluation of an Optical Boosted Add/Drop Multiplexer OBADM including circulators and fiber grating filters", by M.J. Chawki, L. Berthou, E. Delevaqye, E. Gay and I. LeGac for Proc. 21st Eur. Conf. on Opt. Comm., Sep. 17, 1995.

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