Patent
1987-11-18
1989-03-21
Sikes, William L.
350 9612, 350 9613, G02B 610
Patent
active
048137570
ABSTRACT:
Herein disclosed is a branch type optical switch having three or more optical waveguides capable of being coupled to one another in a coupling region, in which is formed a refractive index changing portion for effecting the function of the branch type optical switch by changing the refractive index thereof. This optical switch has a small coupling loss and an excellent extinction ratio. Also disclosed is an intersection type optical switch having two or more optical waveguides intersecting each other. The input optical waveguide and the output waveguide are connected at their intersection by means of a bypass optical waveguide to construct the above-specified branch type optical switch in the coupling regions of the bypass optical waveguides and the input and output optical waveguides, and the bypass optical waveguide has a curved or polygonal shape. Thus, it is possible to provide a small-sized optical switch which has an excellent extinction ratio and little variability in characteristics.
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Chinone Naoki
Inoue Hiroaki
Katsuyama Toshio
Matsumura Hiroyoshi
Nakamura Hitoshi
Healy Brian M.
Hitachi , Ltd.
Sikes William L.
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