Abstract:
A wavelength-division-multiplexed light source for transmitting broadband light through a fiber and receiving an optical signal through the fiber is disclosed. The wavelength-division-multiplexed light source includes: a light source for outputting broadband light; and a coupler for outputting the broadband light, which has been input from the light source, to the fiber through cross coupling, and outputting an optical signal, which has been input from the fiber, through bar coupling, based on a predetermined cross coupling ratio, wherein the cross coupling ratio of the coupler is adjusted depending on a power of the optical signal.
Abstract:
A wavelength division multiplexed light source and a PON(Passive Optical Network) is provided to accommodate more subscribers at a relatively low cost. A plurality of BLSs(Broadband Light Sources)(110-1-110-M) are periodically disposed on a wavelength axis and output light of pre-set wavelength bands having a configuration wavelength, respectively. An M-CWDM(Main-Coarse Wavelength Division Multiplexer)(120) multiplexes a plurality of beams inputted from the BLSs(110-1-110-M) and outputs them. A DWDM(Dense Wavelength Division Multiplexer)(140) performs spectrum division on multiplexed beams inputted from the M-CWDM(120) with channels corresponding to the configuration wavelengths to generate a plurality of channels separated with a wavelength period.
Abstract:
본 발명은 파장분할 다중방식 광통신에 사용되는 경제적인 광원으로서, 온도 조절기를 사용하지 않고도 외부 온도변화에 무관하게 페브리-페롯 레이저의 파장잠김을 유지하는 방법 및 이를 이용한 파장분할다중방식 광원을 제공한다. 본 발명의 파장분할다중방식 광원은 광원과; 주입광의 파장과 일치하지 않는 발진 모드들은 억제하고, 상기 주입광의 파장과 일치하는 발진 모드만을 증폭하여 출력하는 페브리-페롯 레이저와; 상기 광원에서 발생된 광을 스펙트럼 분할하여 상기 페브리-페롯 레이저의 주입광으로 제공하고, 상기 페브리-페롯 레이저에 의해 파장잠김된 신호를 다중화하는 파장분할다중화장치를 포함하여 구성되며, 상기 페브리-페롯 레이저는, 상기 주입광의 3dB 선폭 내에 적어도 하나의 발진 모드가 존재함으로써 외부온도 변화와 무관하게 파장잠김을 유지할 수 있도록 상기 페브리-페롯 레이저의 발진 모드간격은 상기 주입광의 3dB 선폭보다 작도록 된 것임을 특징으로 한다. 페브리-페롯 레이저, 파장잠김, 발진 모드, 3dB 선폭
Abstract:
본 발명에 따른 반사형 반도체 광증폭기 광원은, 증폭된 자발 방출광을 생성 및 증폭하기 위한 투과형 반도체 광증폭기와; 상기 반도체 광증폭기로부터 출력된 증폭된 자발 방출광을 반사시켜서 상기 반도체 광증폭기로 입력시키기 위한 반사기와; 상기 반도체 광증폭기와 상기 반사기 사이에 개재되며, 그 사이로 진행하는 증폭된 자발 방출광의 파장 대역을 제한하기 위해 기설정된 투과파장 대역을 갖는 대역통과 필터를 포함한다.
Abstract:
PURPOSE: A mode-locked Fabry-Perot laser device provided with a multi-resonator and wavelength division multiplexing light source using the same are provided to make the oscillation modes dense by providing with a first and a second resonators. CONSTITUTION: A mode-locked Fabry-Perot laser device(200) provided with a multi-resonator includes a Fabry-Perot layer(210) provided with a first reflector(212) and a second reflector(214) and a reflective material(234) as a third reflector. The third reflector at the outside of the Fabry-Perot laser(210) and forms a second resonator together with the first resonator.
Abstract:
PURPOSE: A method for maintaining a mode locking of Fabry-Perot independent of the change of a temperature and a wavelength division multiplexing light source by employing the same are provided to effectively implement the passive type optical subscriber network. CONSTITUTION: A wavelength division multiplexing light source(100) by using a method for maintaining a mode locking of Fabry-Perot independent of the change of a temperature includes an amplified spontaneous emission(ASE) light source(101), a circulator(102), a waveguide grating router(103) and a Fabry-Perot laser(104). The Fabry-Perot laser(104) suppresses the oscillation mode which does not match to the wavelength of the pumping light and amplifies the oscillation mode which matches to the wavelength of the pumping light. The waveguide grating router(103) divides the spectrum of the light generated at the ASE light source(101) to supply it as the injection light of the Fabry-Perot laser(104) and multiplexes the signal mode locked by the Fabry-Perot laser(104). And, the circulator(102) inputs the light generated at the ASE light source(101) to the waveguide grating router(103) and outputs the signal multiplexed by the waveguide grating router(103) to the transmission link.
Abstract:
PURPOSE: An electronic control valve is provided to prevent fluid leakage while closed. CONSTITUTION: An electronic control solenoid valve(100) consists of a body(110), a plunger(120), an electromagnet(130) and a spring(140). The body contains an inlet line(112) and an outlet line(114). The plunger is vertically moved in a space(116) between the inlet and the outlet lines, with a fluid channel(122). The electromagnet is installed in the body to be placed in one end of the plunger. The spring is formed between the electromagnet and the plunger as a compressed coil spring. Thus, the solenoid valve is opened or closed by the magnetic force of the electromagnet and the vertical movement of the plunger.