Optical component, Optical encoder, Optical decoder, and Optical communication system
First Claim
1. An optical component comprising an optical waveguide type diffraction grating device successively provided with first to N-th refractive index modulation forming areas, each Bragg-reflecting a predetermined wavelength of guided wave, along a longitudinal direction of an optical waveguide;
- and optical path length adjusting means for adjusting an optical path length of a predetermined region including a part of a region between the n-th and (n+1)-th refractive index modulation forming areas adjacent each other in said first to N-th refractive index modulation forming areas in said optical waveguide type diffraction grating device, where N is an integer of at least 2, and n is an integer of at least 1 but not greater than (N−
1).
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Accused Products
Abstract
An optical communication system comprises an optical circulator and an optical component. The optical circulator has first, second, and third ends, outputs from the second end light fed into the first end, and outputs from the third end light fed into the second end. The optical component includes an optical waveguide type diffraction grating device connected to the second end of the optical circulator and provided with a plurality of refractive index modulation forming areas, disposed along the longitudinal direction of an optical fiber, for Bragg-reflecting a predetermined wavelength of guided wave. A predetermined region including the boundary position between two refractive index modulation forming areas adjacent each other in the optical waveguide type diffraction grating device is heated by a thin film heater, so as to adjust the optical path length thereof.
43 Citations
9 Claims
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1. An optical component comprising an optical waveguide type diffraction grating device successively provided with first to N-th refractive index modulation forming areas, each Bragg-reflecting a predetermined wavelength of guided wave, along a longitudinal direction of an optical waveguide;
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optical path length adjusting means for adjusting an optical path length of a predetermined region including a part of a region between the n-th and (n+1)-th refractive index modulation forming areas adjacent each other in said first to N-th refractive index modulation forming areas in said optical waveguide type diffraction grating device, where N is an integer of at least 2, and n is an integer of at least 1 but not greater than (N−
1). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification