Optical waveguides – With optical coupler – Particular coupling structure
Reexamination Certificate
2007-01-16
2007-01-16
Fureman, Jared J. (Department: 2876)
Optical waveguides
With optical coupler
Particular coupling structure
C385S041000
Reexamination Certificate
active
10323935
ABSTRACT:
A variable optical gain control device is capable of amplifying an optical signal while controlling its luminous intensity. The device is made up of optical waveguide paths which are formed on a flat face of a substrate and includes an input directional coupler for combining an input optical signal and a pump laser light; a luminous intensity control portion in the form of a Mach-Zehnder interferometer for controlling the luminous intensity of the optical signal combined with the pump laser light; and an output directional coupler for separating the pump laser light from the resulting optical signal. The luminous intensity control portion is doped with a rare earth element so that the optical signal is amplified by means of the pump laser light, while a heater is applied to one of the optical waveguide paths forming the Mach-Zehnder interferometer to control the luminous intensity of the optical signal.
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Hikaritsuushin Technical Handbook 2002 p. 323-326.
Fureman Jared J.
Koyama Kumiko C.
Oki Electric Industry Co. Ltd.
Rabin & Berdo P.C.
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