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US 6,788,468 B2Granted
Wavelength locker module and wavelength controller for optical communication
AssigneeFurukawa Electric Co., Ltd.
InventorsMizuki Oike, Hiroshi Matsuura, Satoru Abe
Life of this patent
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Abstract
A wavelength controller includes a wavelength locker module, having a prism for dividing incident light into first and second branched light beams, a first light quantity detector for receiving the first branched light beam through a wavelength selective filter and a second light quantity detector for directly receiving the second branched light beam, and detects and suppresses a wavelength variation in incident light entering the module based on outputs of the light quantity detectors.
Claims11
A wavelength locker module comprising:
- a prism for configured to divide incident light into at least first and second branched light beams;
- a wavelength selective filter configured to permit part of the first branched light beam emitted from said prism to pass therethrough;
- a first light quantity detector configured to receive the part of the first branched light beam having passed through said wavelength selective filter;
- and
- a second light quantity detector configured to receive the second branched light beam emitted from said prism, wherein
- said wavelength selective filter has a light transmission characteristic providing more than predetermined ratio of a change in optical transmittance to a change in wavelength of the incident light in a wavelength region including an incident light wavelength.
3 more elements
A wavelength controller comprising:
- a wavelength locker module having a prism configured to divide incident light into at least first and second branched light beams;
- a wavelength selective filter configured to permit part of the first branched light beam emitted from said prism to pass therethrough;
- a first light quantity detector configured to receive the part of the first branched light beam having passed through said wavelength selective filter;
- and a second light quantity detector configured to receive the second branched light beam emitted from said prism;
- a wavelength variation detector which is configured to detect, based on outputs of first and second light quantity detectors of the wavelength locker module, a wavelength variation in incident light entering the wavelength locker module;
- and
- a wavelength variation suppressing mechanism which is configured to suppress the wavelength variation in accordance with a detection result obtained by said wavelength variation detector.
4 more elements
Dependencies are inferred from the claim text.