OPTICAL WAVELENGTH DETECTION TYPE PHYSICAL QUANTITY MEASURING SENSOR USING RING RESONATOR AND BRAGG GRATING

PROBLEM TO BE SOLVED: To increase the number of sensors which can be connected in a wavelength bandwidth which is no more than the wavelength bandwidth used by a conventional distribution measuring system and improve responsivity as a sensor in a fiber-optic distribution measuring system. SOLUTION:...

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Bibliographic Details
Main Author SANO YASUKAZU
Format Patent
LanguageEnglish
Published 08.05.2008
Subjects
MEASURING
MEASURING ANGLES
MEASURING AREAS
MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS
MEASURING QUANTITY OF HEAT
MEASURING TEMPERATURE
PHYSICS
TESTING
THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Summary:PROBLEM TO BE SOLVED: To increase the number of sensors which can be connected in a wavelength bandwidth which is no more than the wavelength bandwidth used by a conventional distribution measuring system and improve responsivity as a sensor in a fiber-optic distribution measuring system. SOLUTION: The sensor is constructed by combining a ring resonator and a fiber-optic Bragg grating or a waveguide with a waveguide Bragg grating, on which a Bragg grating is drawn. This allows a single spectrum of the order of picometers to be obtained, which is far narrower than the reflection bandwidth of a fiber-optic Bragg grating which has been used so far as a sensor, and allows a wavelength to be detected with a good SN ratio even for a slight wavelength shift by a bandpass type wavelength detector such as one using a Fabry-Perot interferometer. COPYRIGHT: (C)2008,JPO&INPIT
Bibliography:Application Number: JP20060288631