Samsung Electronics Co., Ltd.

Kyung-Shik Lee

Sun-Tae Jung

Jeong-Hwan Song

Se-Yoon Kim

Jong-hoon Lim

Yun-Hae Yeh

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.

Optical coupler type filter and wavelength stabilizing apparatus of light source using the same

An interferometric temperature sensing system provides a simplified design for accurately processing an interference fringe pattern using self coupling effects of a laser detection element, where a laser diode and an optical detection element are combined in one package. Accordingly, the present invention is easily made and the measurement of temperatures within a wide range can be easily performed. The interferometric temperature sensing system contemplates an interferometric sensor having one or more reflecting surfaces and different optical paths corresponding to a temperature of a measured object or environment; a laser detection element for emitting a first laser beam in response to a predetermined modulated driving signal and adjusting the amount of the emitted first laser beam corresponding to a second laser beam, the laser detection element also detects the magnitude of an adjusted third laser beam to generate a sense signal that includes temperature information; an optical coupler for propagating the emitted first laser beam to a proximal end of the interferometric sensor, coupling the laser beams fed back through the proximal end of the interferometric sensor into the second laser beam, and then propagating the coupled beam to the laser detection element; a modulated signal generator for generating the modulated driving signal in response to a predetermined pilot signal; and a temperature processor for generating the pilot signal, and detecting a temperature change direction and a fringe number of the sense signal to calculate a temperature change.

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Seoul, South Korea

Kyung-Shik Lee