Optical device control apparatus and optical device control...

Optical waveguides – With optical coupler – Switch

Reexamination Certificate

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Reexamination Certificate

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07110636

ABSTRACT:
The inclination of a reflecting surface of a mirror is adjusted such that light outputted from an input optical fiber is reflected by the mirror so as to be fed into an output optical fiber. The normal direction of the reflecting surface of the mirror vibrates about a predetermined direction at a predetermined frequency. A part of the light propagating through the output optical fiber is taken out by a light-branching part, so as to be received by a photodiode, whereby an electric signal having a value corresponding to thus received quantity of light is outputted from a detection circuit. Whether or not the electric signal includes a component of the predetermined frequency or whether the component is strong or weak is detected, whereby whether or not there is optical coupling from the input optical fiber to the output optical fiber or the extent thereof is determined.

REFERENCES:
patent: 6014478 (2000-01-01), Spaeth
patent: 6300665 (2001-10-01), Peeters et al.
patent: 6697547 (2004-02-01), Walter et al.
patent: 6775043 (2004-08-01), Leung et al.
patent: 2002/0076136 (2002-06-01), Ducellier et al.
patent: 2002/0191901 (2002-12-01), Jensen
patent: 2003/0012489 (2003-01-01), Oikawa
patent: 2004/0146298 (2004-07-01), Ikegame

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