Variable-attenuation tunable optical router

Optical waveguides – With optical coupler – Plural

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Details

385 37, 25022718, G02B 628

Patent

active

057063753

ABSTRACT:
A device for distributing an optical signal has an optical waveguide with a plurality of gratings disposed in series therein, the gratings having a predetermined reflectivity response within a specific wavelength range; an optical circulator having at least three ports, one of the ports serving as an input port for receiving the optical signal, and another port for removing at least a part of the optical signal reflected from one of the gratings; and control means for individually controlling at least some of the gratings to effect a change of the wavelength range of the reflectivity response of the gratings. The change may be a shift, an expansion or a compression of the range. The device can function as a signal distributor (router), an equalizer or a demultiplexer. The reflectivity response is preferably a sloped response.

REFERENCES:
patent: 5401956 (1995-03-01), Dunphy et al.
patent: 5446809 (1995-08-01), Fritz et al.
patent: 5557442 (1996-09-01), Huber
Programmable fiber grating based wavelength demultiplexer; L. Quetel; L. Rivoallan, E. Delevaque; H. Poignant; M. Monerie; T. Georges; France Telecom; CNET Lab/Rio/Tso, Technopole Anticipa. Lannion 22307 France. OFC '96 Technical Digest.

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