Title:
【発明の名称】回折格子を有する光検出装置
Document Type and Number:
Japanese Patent JP3067880
Kind Code:
B2
Abstract:
A light detector provides wavelength tracking, monitoring or similar function by forming a diffraction grating in a light waveguide (4). Diffracted light from the waveguide is received by a light detecting device (11) having multiple detecting portions (PD1,...). Changes in the emission angle of the diffracted light caused by the wavelength or other fluctuation of the incident light are detected. The detected information can be used for wavelength tracking by injecting current into or applying a voltage to the waveguide to regulate the Bragg wavelength of the light waveguide, for monitoring and/or controlling the oscillation wavelength of a semiconductor laser or for other purposes.
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Inventors:
Yoshinobu Sekiguchi
Natsuhiko Mizutani
Natsuhiko Mizutani
Application Number:
JP1818592A
Publication Date:
July 24, 2000
Filing Date:
January 04, 1992
Export Citation:
Assignee:
Canon Inc
International Classes:
G01J1/02; G01J1/04; G01J3/18; G02B6/122; G02B6/34; H01L31/10; H01S5/026; H01S5/0687; H01S5/187; H04B10/07; H04B10/272; H04B10/275; H04B10/40; H04B10/50; H04B10/60; H01S5/0625; H01S5/50; (IPC1-7): G01J3/18; G01J1/02; G01J1/04
Domestic Patent References:
| JP60202316A | ||||
| JP63194234A | ||||
| JP63202723A | ||||
| JP63250535A | ||||
| JP263012A | ||||
| JP24209A | ||||
| JP2237176A |
Attorney, Agent or Firm:
Kazuo Kato