Abstract:
PURPOSE: An open type optical subscriber network system is provided to enable a user to change services by connecting a plurality of service and user through an optical infra without wavelength selectivity. CONSTITUTION: An optical line terminal part transmits and receives the optical signal of the specific transmission channel among the entire transfer channel which the light infra accepts. The optical network end part transmits a modulated optical signal of the predetermined transmission channel in the optical line terminal part to the optical line terminal part. An optical line terminal part and the optical distribution/joint part are included in the optical line terminal part.
Abstract:
PURPOSE: A seed optical module for passive optical networks is provided to apply an optical line terminal more efficiently by minimizing the loss of optical power during the process of splitting the spectrum. CONSTITUTION: A light amplifier(110) amplifies seed light. An optical wavelength filter(120) transmits broadband light, which is outputted in the opposite direction of the seed light, in periodic frequency intervals. A reflecting mirror(130) reflects spectrum-split light towards an optical wavelength filter with the optical wavelength filter. A gain flattening filter is arranged between the optical wavelength filter and the reflecting mirror. The gain flattening filter flattens the intensity of the signals which are outputted as seed light.
Abstract:
PURPOSE: An optical transmitting device at WDM-PON with improvement of reflection sensitivity and a method thereof are provided to improve stability and reliability of an optical link by making the optical link less sensitive to reflection. CONSTITUTION: A laser diode(10) produces an optical signal and uses the produced optical signal as seed light. A controller unit(20) extends line widen of an output spectrum of the laser diode by approving DC bias and RF signal to the laser diode on electricity of the laser diode. The controller unit comprises the input control part and the output control uniting the optical signal outputted by each wavelength, and uses the combined optical signal as the seed light.
Abstract:
PURPOSE: An optical backhaul network for a wireless broadband service is provided to transmit a downlink optical signal of single mode and transmit a wave-multiplexed uplink optical signal, thereby efficiently connecting one center with access points. CONSTITUTION: A plurality of subscriber side ONU(Optical Network Unit)s(400-1~400-M) outputs upward optical signals which are wave-multiplexed. An OLT(Optical Line Terminal)(200) outputs a downward optical signal of single mode. A plurality of remote nodes(300-1~300-K) outputs part of the downward optical signal to a subscriber side ONU.
Abstract:
본 발명은 장파장 대역 광증폭기로 입력되는 신호의 광세기가 변화하거나 혹은 파장이 변화하더라도 이득을 일정하게 유지할 수 있도록 하여 안정된 광출력를 제공하기 위한 광증폭기에 관한 것으로, 입력 광신호를 증폭하는 증폭부; 및 상기 증폭부에서 발생된 역방향 ASE를 반사시켜 상기 광섬유로 재입사시키기 위한 ASE 반사부를 구비하여, 역방향 ASE를 EDF로 재입력 시켜 입력 광의 세기나 파장의 변화에도 무관하게 일정한 이득을 갖도록 할 수 있다. 광증폭기 (Optical Amplifier), 장파장 대역 (L-band), 광섬유 회절격자 (Fiber Bragg Grating), 과도 응답 (Transient Response)
Abstract:
복수의파장채널을효율적으로사용하기위한 OLT 및 ONU가수행하는등록방법이제공될수 있다. OLT 및 ONU는서로의파장출력특성이표시된메시지를교환할수 있다. ONU는한 개의파장만을사용하는고정파장광 트랜시버, 복수개의파장중에서한 개의파장을선택하여사용하는가변파장광 트랜시버, 복수개의파장중에서적어도한 개이상의파장을동시에사용하는멀티파장광 트랜시버중에서어느하나를포함할수 있다. OLT는 ONU에포함된광 트랜시버를식별하여, 식별된광 트랜시버의특징에따라 ONU가사용할파장을결정할수 있다.
Abstract:
시간및 파장분할다중-수동형광 네트워크(TWDM-PON)에서파장가변광망유닛(ONU)의파장을변경하는방법이개시된다. 일실시예에따른파장변경방법은제1 파장으로 ONU에게서비스를제공하는소스광회선단말(OLT)이타깃 OLT가서비스를제공하는제2 파장으로의파장변경을요청하는파장변경요청메시지를전송하는단계및 ONU가파장변경요청메시지에응답하여파장변경이가능한지여부를지시하는파장변경응답메시지를소스 OLT로전송하는단계를포함한다. 이때, 파장변경요청메시지는파장변경을수행할 ONU를특정하기위한식별정보로서시스템 ONU 아이디, 채널별 ONU 아이디, 및개별 ONU 아이디중에서하나를포함할수 있다.