Abstract:
본 발명의 링형 광 네트워크의 광 애드/드롭 모듈 노드는 입력되는 워킹 광섬유의 광신호와 프로텍션 광섬유의 광신호를 결합하여 출력하는 제1커플러와, 제1커플러의 출력 광신호를 파장분할 다중/역다중화하는 다중/역다중화부와, 다중/역다중화부의 광신호 다중/역다중화 경로에서 애드 또는 드롭할 채널 신호를 애드/드롭하거나 애드할 신호를 제2커플러로 출력하는 애드/드롭부와, 애드/드롭부에서 출력되는 애드할 신호를 프로텍션 광섬유의 광신호와 결합하여 출력하는 제2커플러와, 스위칭 제어신호에 의해 경로를 스위칭 변경하여 제2커플러의 출력을 통과시켜 출력하거나 제1커플러로 출력하는 스위치와, 애드/드롭부에서 애드/드롭되는 신호를 분석하여 인접 노드간의 링크 장애를 판단하며 그에 따라 스위치에 스위칭 제어신호를 출력하는 제어부를 가진다. 링형, 광 네트워크, 노드, OADM
Abstract:
A Gigabit Ethernet-based passive optical network that can reliably transmit data is disclosed. The network includes an OLT for receiving a public key through a transmission medium, encrypting a secret key by means of the received public key, transmitting the encrypted secret key, encrypting data by means of the secret key, and transmitting the encrypted data, the OLT being located in a service provider-side. The network also includes an ONT for transmitting the public key to the OLT, receiving the secret key transmitted from the OLT, decrypting the secret key by means of a private key, receiving the data, and decrypting the received data by means of the decrypted the secret key. The public key is used for encrypting the secret key. The secret key is encrypted by means of the public key. The data is encrypted by the OLT by means of the secret key.
Abstract:
암호화 키 교환을 통해 데이터를 안정적으로 전송할 수 있는 기가비트 이더넷 기반의 수동 광가입자망이 개시된다. 기가비트 이더넷 기반의 수동 광가입자망은, 전송매체를 통해 수신한 공개키를 이용하여 비밀키를 암호화하여 전송하고 암호화된 비밀키로 데이터를 암호화하여 전송하는 OLT(Optical Line Terminal), 및 비밀키를 암호화하는데 이용되는 공개키를 OLT로 전송하고 OLT로부터 전송된 암호화된 비밀키를 수신하여 공개키로 복호화하며 OLT로부터 전송된 암호화된 비밀키로 암호화된 데이터를 수신하여 복호화된 비밀키로 복호화하는 적어도 하나의 ONT(Optical Network Terminal)를 포함한다.
Abstract:
PURPOSE: A wavelength path monitoring/modifying device in an electro-optical OXC(Optical Cross-Connect) unit is provided to realize a path monitoring signal generator by using one optical transmitter and one optical delay module, in order to find out input ports and wavelength numbers, thereby reducing a manufacturing cost. CONSTITUTION: Path monitoring information generators(100,110,120) delay predetermined generated optical signals in sub frame and time slot unit according to a sequence of input optical signals, and output mobile path monitoring information optical signals. Wavelength demultiplexers(30) demultiplex the input optical signals, respectively, and output the demultiplexed signals as many as the second predetermined numbers. Optical couplers(40) couple the demultiplexed signals with the mobile path monitoring information optical signals one to one. Optical switches(50) switch the coupled optical signals, and output the switched signals. Wavelength multiplexers(60) multiplex the outputted optical signals, and output the signals to output ports having the first predetermined number. Path monitoring information detectors(70,80,90,150) detect the mobile path monitoring information optical signals to convert into electrical signals, and detect sub frame/time slot position information to generate mobile path monitoring information. Path monitoring controllers(130,140,150) compare the sub frame/time slot position information with switching information, and modify an abnormal path.
Abstract:
PURPOSE: A reconfigurable optical add/drop multiplexer is provided to perform an optical add/drop multiplexing function by integrating an optical waveguide method and a MEMS method. CONSTITUTION: A reconfigurable optical add/drop multiplexer includes a first waveguide, a second waveguide, an optical resonator, and a switching unit. The first and the second waveguides(110,120) includes input ports and output ports and are parallel to each other. The optical resonator(100') is installed between the first and the second waveguides in order to filter a particular resonant wavelength by performing a lateral coupling process. The switching unit controls a horizontal tilt angle in order to turn on or off the lateral coupling process among the first and the second waveguides and the optical resonator.