Optical coupler type filter and wavelength stabilizing...

Optical waveguides – With optical coupler – Input/output coupler

Reexamination Certificate

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Details

C385S042000, C398S082000, C398S087000, C398S094000, C398S095000

Reexamination Certificate

active

07146077

ABSTRACT:
Disclosed are an optical coupler type filter, and a wavelength stabilizing apparatus of a light source using the same. The wavelength stabilizing apparatus includes an optical coupler type filter including a first waveguide provided with first and second terminals, a second waveguide provided with a third terminal, a coupling region where the first and second waveguides are adjacent to each other so as to couple lights, and a grating disposed in the coupling region, a light source for outputting light to the first terminal, a first optical detector for detecting extracted light outputted from the third terminal as a first electric signal, a signal processor for determining the wavelength of the light outputted from the light source based on the power of the first electric signal, and outputting a control signal in the case that the wavelength of the light deviates from a stabilizing wavelength, and a driver for controlling the output wavelength of the light source based on the control signal, wherein the length of a sub-region of the coupling region, formed between the grating and the first terminal is set to minimize the power of a recurrent light reflected by the grating and outputted to the first terminal.

REFERENCES:
patent: 4737007 (1988-04-01), Alferness et al.
patent: 5778119 (1998-07-01), Farries
patent: 5978530 (1999-11-01), Russell et al.
patent: 6236782 (2001-05-01), Kewitsch et al.
patent: 6578388 (2003-06-01), Kewitsch et al.
patent: 2004/0101249 (2004-05-01), Tseng et al.
patent: 2005/0226558 (2005-10-01), Kim et al.

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