Channel add/drop filter-coupler

Details Channel add/drop filter-coupler Channel add/drop filter-coupler

1985-06-28

1987-06-16

Lee, John

Multiplex communications

Wide area network

Packet switching

350 9629, 370 3, G02B 626

Patent

active

046732705

ABSTRACT:
A channel add/drop filter-coupler includes two single-mode optical fibers that have different refractive index profiles. Each optical fiber has a propagation constant that is a function of frequency. A portion of the cladding of each fiber is removed to form a planar surface on each fiber. A plurality of channels is formed in one or both of the planar surfaces. The channels are spaced with a predetermined channel period that is inversely proportional to the difference between the propagation constants of the two fibers of the filter-coupler at the desired center frequency of the filter-coupler. The filter-coupler is completed by joining the two fibers at the planar surfaces. The coupling of the filter-coupler may be tuned by moving one fiber longitudinally, angularly, or, preferably, laterally with respect to the other fiber. Furthermore, the filter response of the filter-coupler is advantageously shaped by varying the location of the channels within the predetermined channel periods or by varying the depth or the width of the channels.

REFERENCES:
patent: 4315666 (1982-02-01), Hicks, Jr.
patent: 4342499 (1982-08-01), Hicks, Jr.
patent: 4493528 (1985-01-01), Shaw et al.
patent: 4556279 (1985-12-01), Shaw et al.
patent: 4564262 (1986-01-01), Shaw
"Energy Interchange Between Waves in Quadrupolar Pump Fields," by E. I. Gordon and A. Askin, Journal of Applied Physics, vol. 32, pp. 1137-1144, Jun., 1961.

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