Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2006-12-05
2006-12-05
Healy, Brian M. (Department: 2883)
Optical waveguides
With optical coupler
Input/output coupler
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.
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Jung Sun-Tae
Kim Se-Yoon
Lee Kyung-Shik
Lim Jong-Hoon
Song Jeong-Hwan
Cha & Reiter LLC
Healy Brian M.
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