Abstract:
Wavelength division multiplexing (WDM) has enabled telecommunication service providers to fully exploit the transmission capacity of optical fibers. State of the art systems in long-haul networks now have aggregated capacities of terabits per second. Moreover, by providing multiple independent multi-gigabit channels, WDM technologies offer service providers with a straight forward way to build networks and expand networks to support multiple clients with different requirements. In order to reduce costs, enhance network flexibility, reduce spares, and provide re-configurability many service providers have migrated away from fixed wavelength transmitters, receivers, and transceivers, to wavelength tunable transmitters, receivers, and transceivers as well as wavelength dependent add-drop multiplexer, space switches etc. However, to meet the competing demands for improved performance, increased integration, reduced footprint, reduced power consumption, increased flexibility, re-configurability, and lower cost it is desirable to exploit / adopt monolithic optical circuit technologies, hybrid optoelectronic integration, and microelectromechanical systems (MEMS).
Abstract:
Techniques for communications using optical fiber are disclosed. An optical add/drop multiplexer (OADM) node includes an interface to a first fiber pair connecting a first trunk station and a second trunk station. The OADM node further includes an interface to a second fiber pair connecting the first trunk station and the second trunk station with a branch station. The OADM node includes a plurality of filters configured to provide connectivity between the first trunk station, the second trunk station and the branch station. Other embodiments are described and claimed.
Abstract:
A communications network transport node 10 comprising an optical add-drop multiplexer (OADM) 12,comprising optical signal processing apparatus 16 and electrical signal routing apparatus 18, and a packet switch 14. Each optical signal processing apparatus 16 comprises an optical input 20, an optical output 22, optical-to-electrical (O-E) signal conversion apparatus 24, arranged to receive input optical channel signals and to convert each into an input radio frequency (RF) modulated electrical channel signal,and electrical to optical(E-O) signal conversion apparatus 26, arranged to receive output RF modulated electrical channel signals and to convert each into an output optical channel signal. The electrical signal routing apparatus 18 determines which input RF modulated electrical channel signals are to be dropped, and routes these to the electrical drop outputs, and which are to be transmitted, and routes these to a selected E-O apparatus 26. The routing apparatus 18 receives further electrical channel signals and routes these to a selected E-O apparatus 26. The packet switch 14 receives the input RF modulated electrical channel signals to be dropped and delivers further RF modulated electrical channel signals to the OADM 12.
Abstract:
파장분할 다중방식 수동형 광가입자망의 광신호 모니터링 장치 및 시스템에 관한 것으로서, 하향 링크 신호 및 상향 링크 신호를 각각 입력받는 입력부와, 하향 링크 신호 및 상향 링크 신호를 각각의 파장별로 분리하는 파장분할 다중화 필터와, 파장별로 분리된 각각의 신호의 광파워를 측정하는 광파워 측정 모듈 및 광파워 측정 모듈에서 측정된 광파워 정보를 기초로 광선로의 고장 유무를 판단하는 제어부를 포함하는, 광신호 모니터링 장치 및 시스템이 제공된다.