APPARATUS FOR HIGH-SPEED DETECTION OF WAVELENGTH

摘要

PROBLEM TO BE SOLVED: To provide a high-speed wavelength detecting apparatus capable of highly accurately measuring the wavelengths of a plurality of propagation lights at a high speed, and to provide a high-speed wavelength detecting apparatus capable of measuring reflected light of especially a plurality of FBG (fiber Bragg grating) sensors formed in an optical fiber.

SOLUTION: In the high-speed wavelength detecting apparatus for detecting both the wavelengths of the plurality of propagation lights propagating through a specific medium and the amount of change in the wavelengths, the plurality of propagation lights ate branched by a wavelength demultiplexer for demultiplexing the plurality of propagation lights wavelength band by wavelength band having the wavelength of each propagation light as a center. Each propagation light branched by each wavelength band is branched by dividing filters which change their output power according to changes in wavelengths. The dividing filters are plane optical waveguides, it is preferable that a plurality of the dividing filters are formed on the same substrate, and it is preferable that a polarizer is inserted in the preceding stage of the dividing filters.

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