Switchable wavelength add/drop component

Details Switchable wavelength add/drop component Switchable wavelength add/drop component

1997-08-04

1999-08-31

Palmer, Phan

Optical waveguides

With optical coupler

Plural

385 10, 385 16, 385 37, 385 47, 359127, 359130, G02B 628

Patent

active

059464305

ABSTRACT:
A device for adding and/or dropping a signal to a transmission line. First and second optical circulators are connected by at least one switchable grating reflector, whereby a grating reflector can be switched into or out of the connecting path between the two circulators. A plurality of optical signals, each centered about a different wavelength, is coupled to a first port of the first circulator; these signals appear at the second port thereof. If a grating reflector capable of reflecting .lambda..sub.i is switched into the circuit, the signal centered about .lambda..sub.i propagates from the second port of the first circulator and reflects from the grating reflector back into the second port and out of the third port. The remainder of the input signals that are not reflected by grating reflectors propagate into the first port and from the second port of the second circulator as an output thereof. Also, a signal at wavelength .lambda..sub.i input to the third port of the second circulator propagates from the first port to the grating reflector where it reflects back to the second circulator and appears at the second port as an output thereof.

REFERENCES:
patent: 4860294 (1989-08-01), Winzer et al.
patent: 5026137 (1991-06-01), Tokumitsu
patent: 5283686 (1994-02-01), Huber
patent: 5410624 (1995-04-01), Morkel
patent: 5426297 (1995-06-01), Dunphy et al.
patent: 5446809 (1995-08-01), Fritz et al.
patent: 5579143 (1996-11-01), Huber
patent: 5600473 (1997-02-01), Huber

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