Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-01-10
1994-03-29
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359132, 359188, 385 10, H04B 1012, H04J 1402
Patent
active
052990451
ABSTRACT:
A light detector provides wavelength tracking, monitoring or similar function by forming a diffraction grating in a light waveguide. Diffracted light from the waveguide is received by a light detecting device having multiple detecting portions. 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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Canon Kabushiki Kaisha
Pascal Leslie
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