Abstract:
PURPOSE: A mode locking optical fiber laser and optical amplifier using single pump optical source is provided to drive a mode locking optical fiber laser and an optical amplifier amplifying an optical soliton pulse with single pump optical source for effectively utilizing the pump optical source. CONSTITUTION: The device comprises a mode locking optical fiber laser(10), an optical amplifier(20), a variable type directional coupler(30) and a pump optical source(40). The variable type directional coupler(30) is connected to the pump optical source(40). The mode locking optical fiber laser(10) is connected to one output port of the coupler to receive the pump output of the source(40) and output an optical soliton pulse. The optical amplifier(20) is connected to another output port of the coupler to receive and amplify the optical soliton pulse.
Abstract:
PURPOSE: A terahertz receiver and a receiving method of terahertz signals using the same are provided to have high sensitivity signal-receiving performance by combining terahertz signals arrayed by a photoelectric conversion. CONSTITUTION: A plurality of terahertz wave detectors (111-113) detects terahertz band signals from received signals. A plurality of light signal processers (120,130,140) converts the detected terahertz signals into optical signals. An optical coupler (150) couples the converted optical signals to one optical signal. A photoelectric conversion diode (160) converts the integrated optical signal into an electric signal. An amplifier (170) amplifies the electric signal. [Reference numerals] (111,112,113) Terahertz wave detector; (121,131,141) Light source; (122,132,142) Light modulator; (123,133,143) Light amplifier; (150) Optical coupler; (160) Photoelectric conversion diode; (170) Amplifier; (AA) Received signal
Abstract:
PURPOSE: A waveguide type photomixer is provided to reduce a moving distance of an electron-hole pair and a RC time constant. CONSTITUTION: A waveguide type photomixer(100) includes a substrate(101), a buffer layer(102), a first cladding layer(107), an absorber(110), a second clad layer(108), a contact layer(109), a first electrode unit(103), and a second electrode unit(104). The absorber is formed between the first clad layer and the second clad layer. If the absorber forms a junction area smaller than the first clad layer and the second clad layer, a RC time constant, which determines an operation speed of the photo mixer, becomes smaller and the operation speed of the photo mixer increases.
Abstract:
본 발명은 광전도 안테나에 실리콘 볼렌즈가 일체화된 테라헤르츠파 송수신 모듈 및 그 제조 방법에 관한 것으로, 실리콘 볼렌즈를 광전도 안테나에 일체화시키고, 실리콘 볼렌즈와 일체화된 광전도 안테나에 집속 렌즈를 정렬시켜 하나의 완전하고 독립된 테라헤르츠파 송수신 모듈을 구현함으로써, 간단한 구조에 의해 테라헤르츠파를 안정적으로 발생시키거나 측정할 수 있는 것을 특징으로 한다. 따라서, 본 발명에 따르면 테라헤르츠파 발생 및 측정 시스템의 단순화 및 소형화를 도모할 수 있다. 테라헤르츠파, 광전도 안테나, 실리콘 볼렌즈, 정렬
Abstract:
PURPOSE: An integrated antenna device module for generating terahertz continuous waves and a fabrication method thereof are provided to reduce the resolution limit of an optical lens by using an existing optical lens as a metamaterial lens. CONSTITUTION: A photoconductive antenna(10) of an integrated antenna device module for generating terahertz continuous waves comprises a photoconductive thin film pattern(11), a metal electrode(12), and a focusing meta material lens(13) for controlling three-dimensional images of an object using high resolution. A substrate is high resistant silicon or InP(Indium Phosphide). The metal electrode applies a DC bias voltage to the photoconductive thin film pattern. The photoconductive thin film pattern is deposited on a front surface of the substrate. The photoconductive thin film pattern irradiates tera-herts continuous waves according to the incidence of the femto second laser pulse having the pulse time of an ultrashort pulse.
Abstract:
PURPOSE: A device and a method for generating a continuous terahertz wave are provided to suppress an optical carrier by a polarization feature of a light source. CONSTITUTION: An optical carrier providing unit(110) provides two optical carriers of a single wavelength. A light intensity modulating unit(120) receives one from the two optical carriers. The light intensity modulating unit generates a DSBSC(Double Sideband-Suppressed Carrier) signal including a DSB(Double Sideband) signal and a suppressed optical carrier. An extraction unit(130) receives the other one among the two optical carriers. The extraction unit extracts an optical carrier of a single polarization component. An optical coupler couples an optical carrier of a single polarization component with the DSB-SC signal.
Abstract:
PURPOSE: A THz wave Tx/Rx module package and a manufacturing method thereof are provided to simply array a silicon ball lens, a photoconductive antenna and a condensing lens to high precision. CONSTITUTION: A silicon ball lens(230) is arranged in the lower of a substrate. A condensing lens(240) condenses a femtosecond laser pulse. A condensing lens arranging device(250) arranges the condensing lens in the active area central part of the photoconductive antenna. Upper and lower fixing parts(260a,260b) open perpendicular upper and lower part of the active area of the photoconductive antenna. Upper and lower covers(270a,270b) shut the opened area of the upper and lower fixing parts.