1977-06-29
1978-11-28
Corbin, John K.
350 9615, G02B 514
Patent
active
041273206
ABSTRACT:
A multimode optical waveguide having refractive index n, width a, and length L is provided with branches on either side of each end and has an electrode pattern capable of differentially delaying the even modes and the odd modes of light of wavelength .lambda. in the waveguide when voltage is applied. When the length L is a half-critical length, calculated to be (2na.sup.2 /.lambda.), or multiple thereof, the device acts as an amplitude modulator or switch. At least one of the electrodes typically is very slender and has a width less than about one-fourth the waveguide width a, so as to achieve different effects on the different modes by causing a laterally nonuniform but bilaterally symmetric refractive index change in the waveguide.
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Bell Telephone Laboratories Incorporated
Corbin John K.
Hille Rolf
Hollander James F.
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