Abstract:
시간 및 주파수 분할 다중 - 수동형 광 네트워크(TWDM-PON)에서 파장가변 광망 유닛의 물리계층 파장 결정 방법이 개시된다. 먼저, TWDM-PON 시스템에서 사용될 수 있는 채널들 중에서 임의의 채널의 하향 파장에 파장가변 수신기의 수신 파장을 맞춘다. 그리고 소정의 시간 동안 파장가변 수신기가 신호 손실(LOS) 상태를 유지하는지 또는 LOS 상태가 해제되는지를 확인한다. 확인 결과 파장가변 수신기의 LOS 상태가 해제되면, 해당 채널에서 후속되는 링크 설정 절차를 수행하지만, LOS 상태가 유지되는 것으로 확인되면 다른 채널의 하향 파장으로 파장가변 수신기의 수신 파장을 변경한다.
Abstract:
The present invention relates to a method for selecting a wavelength of an optical network terminal in a passive optical network, comprising: a usage wavelength candidate selecting step where a prestored basic wavelength is selected as a usage wavelength candidate or a wavelength is changed and the changed wavelength is selected as a usage wavelength candidate in a case that a predetermined wavelength changing condition is satisfied; a downward synchronizing step where frame synchronization is obtained for a downward signal having the same wavelength as the selected usage wavelength candidate; and a terminal registering step where a registration request message is transmitted to an optical line terminal (OLT) which has transmitted the downward signal in the case that the frame synchronization is obtained, and allocating the usage wavelength candidate as a usage wavelength used in communications with the optical line terminal and registering the usage wavelength in the optical line terminal in a case that a registration admission message is received from the optical line terminal.
Abstract:
Disclosed are an optical network terminating device with a power saving function and a power saving method thereof. According to an embodiment of the present invention, the optical network terminating device includes a first signal transceiving part transceiving a signal with an optical line terminal, a second signal transceiving part transceiving a signal with a subscriber terminal through multiple communication terminals, a signal processing part controlling the signals transceived through the first and second signal transceiving parts, and a processor controlling power of the signal processing part and the first transceiving part according to the reception of data traffic through the communication terminals.
Abstract:
Disclosed is a time and wavelength division multiplexed passive optical network (TWDM-PON) system and a communication connection method thereof. According to an embodiment of the present invention, the communication connection method is a method of communicating with other optical line devices and an optical network unit which is communicatively connected to any one of the optical line devices. The optical network unit receives a wavelength change command on the operating wavelengths which are assigned to an optical line device to be connected and synchronizes to a downlink signal on the operating wavelengths by changing the wavelength in response to a wavelength change order. Furthermore, the optical network unit communicates with the optical line device by receiving an upstream discovery grant signal transmitted from the optical line device to be connected and by transmitting a reception confirmation signal therefor.
Abstract:
본 발명은 씨앗 광원으로부터 수신한 씨앗광을 파장 역다중화 하는 제1 파장 다중화 장치, 및 적어도 하나의 가입자측 단말 장치로부터 상기 파장 역다중화된 씨앗광을 이용하여 생성된 상향 광신호를 수신하여 파장 역다중화 하는 제2 파장 다중화 장치를 포함하는 국사용 광장치(OLT)를 제안한다. 파장분할 다중화, 수동형 광가입자망, 씨앗 광원
Abstract:
PURPOSE: An optical transmission device in a WDM-PON(Wavelength Division Multiplexing-Passive Optical Network) and an optical transmission method thereof are provided to reduce the reflection sensitivity in an optical link by extending the line width of an output spectrum in a laser diode. CONSTITUTION: A laser diode(10) generates an optical signal. The laser diode uses the generated optical signal as a seed light. A control unit(20) controls to output the optical signal by applying direct bias and an RF(Radio Frequency) signal to the laser diode in the threshold current of the laser diode. The control unit extends the line width of an output spectrum in the laser diode. [Reference numerals] (10) Laser diode; (200) Input control unit; (210) Output control unit;
Abstract:
PURPOSE: A current control device and method of an optical transmitter are provided to maximize energy efficiency by assuring uncooled operation of a light source. CONSTITUTION: A temperature reference control signal generator(330) generates a current control signal according to temperature variation in a light source. A current controller generates a variable current according to the current control signal. The current control signal includes a bias current control signal and a modulation current control signal. The current controller includes a bias current controller(310) and a modulation current controller(320). [Reference numerals] (310) Bias current controller; (311) Variable bias current generator; (312) Bias current corrector; (320) Modulation current controller; (321) Variable modulation current generator; (322) Modulation current corrector; (330) Temperature reference control signal generator; (331) Temperature change detector; (332) Bias current control signal generator; (333) Modulation current control signal generator
Abstract:
PURPOSE: A wavelength division multiplexing optical communication system and a method for measuring optical output signal performance therefor are provided to improve transmission and reception performance of an optical signal by providing a determination threshold adjusting device. CONSTITUTION: A service provider apparatus comprises a plurality of first light transmitting and receiving devices, a first light multiplexer and demultiplexer for multiplexing and demultiplexing light which is transmitted and received in the plurality of first light transmitting and receiving device, and a seed light source which provides seed light. A plurality of subscriber devices comprise a second light transmitting and receiving device, respectively. A local node connects a service provider device with the plurality of subscriber devices through a DWDM(dense wavelength division multiplexing) link including a second light multiplexer and demultiplexer and a single mode optical fiber for transmission. Light intensity of an output signal from the second light transmitting and receiving device is determined by compensating a loss value. [Reference numerals] (AA) Spectrum before locking; (BB) Spectrum after locking
Abstract:
PURPOSE: A wavelength non-dependence optical source operating apparatus is provided to optimally operate wavelength non-dependence optical sources based on the identified wavelength values by using a wavelength identification signal. CONSTITUTION: A seed optical signal generation unit(130) creates one or more seed optical signals based on wavelength identification signals(121~123). A wavelength optical detecting unit(170) detects the wavelength identification signals from the created seed optical signals. An extraction unit(180) extracts wavelength values matched with the detected wavelength identification signal. The extraction unit extracts the operation condition of a wavelength-independent optical source matched with the extracted wavelength values. An operating unit(190) operates the wavelength non-dependence optical sources.
Abstract:
PURPOSE: A plug type optical transmitting and receiving module is provided to improve the spatial utility of the module by changing the structure of small form-factor pluggable main body and the structure of a printed circuit board. CONSTITUTION: A main body(10) is composed of an upper body(12) and a lower body(14). A light transmitting element(20) and a light receiving element are installed in the main body. A printed circuit board controls each element by being in connection with the light transmitting element and the light receiving element. The printed circuit board is composed of a first printed circuit board(32), a second printed circuit board(34), and a third printed circuit board(36). A standard light connector(24) is combined with the front side of the main body.