Abstract:
Multiplexor óptico pasivo de tipo, "add-drop" para sistemas de telecomunicación basados en la transmisión de múltiples señales ópticas por medio de su- multiplexacion por división en longitud de onda (WDM). El dispositivo distingue entre señales transmitidas en conjuntos de uno o más canales ópticos situados en bandas separadas del espectro óptico. Incorpora al menos dos filtros ópticos (20,30,120,130), un primer multiplexor WDM (50,150) y un combinador (40,140). El primer filtro (20,120) y el segundo filtro (30,130) están conectados ópticamente entre si y también con el primer multiplexor WDM (50,150). El combinador (40,140) combina en una señal óptica de salida, un canal de a insertar con la señal óptica reflejada sin los al menos dos canales ópticos diferentes desviados por los filtros.
Abstract:
An optical switch (100) suitable for use in an add/drop of an optical network node having F>1 optical fibre per direction, the F fibres together carrying optical signals comprising up to N independent wavelength channels. The switch (100) includes an Optical Cross-Connect (QXC) (101) having F input ports (102) and N output ports (106). F optical splitters (103) are connected to the OXC (101), the input and output ports (104, 104) of the optical splitters defining ports of the OXC (101). The OXC (101) is controllable to switch optical signals arriving at any of the F switch input ports (102) to the input port (104) of any of the F optical splitters (103) such that each switch input port (101) is switched to an optical splitter (103) having at least as many splitter output ports (104) as the number of independent wavelength channels received at the switch input port (101). A method for splitting optical signals is also disclosed.
Abstract:
본 발명은 CWDM(Coarse Wavelength Division Multiplexing) 파장 그리드(wavelength grid)당 적어도 2개 이상의 파장 채널을 할당하여 채널 용량을 증가시킬 수 있는 신호 처리 방법 및 그를 위한 양방향 CWDM 환형 네트워크 시스템에 관한 것이다. 본 발명의 양방향 CWDM 환형 네트워크 시스템(Ring Network System)은, 특정 파장을 갖는 광신호를 형성하고, CWDM 파장 그리드당 적어도 2개의 파장 채널을 할당하며, 적어도 2개의 광송수신기에서 형성한 광신호 중 특정 파장의 광신호를 삽입 또는 추출한다.
Abstract:
In today's reconf?gurable optical add/drop multiplexer (ROADM) based optical node, ROADMs multiplex (and demultiplex) colored optical signals to form wavelength-division multiplexed (WDM) signals. Transponders connected to the ROADMs' add/drop ports convert noncolored optical signals to colored optical signals (and vice versa). Dedicating transponders to given ports degrades the node's ability to route around network failures. Example embodiments of the invention include an optical node and corresponding method for routing optical signals within an optical node that compensate for this inflexibility. The optical node may include two ROADMs to transmit respective WDM signals onto at least two internode network paths and a routing module that can direct channels of the same wavelength along different internode network paths. Advantageously, a transponder may transmit (receive) different signals at the same wavelength to (from) different network node interfaces within the optical node, thereby improving the optical node's ability to route around network failures.
Abstract:
Methods and apparatus are described for DWDM transport of CATV and digital signals over optical fiber in low-dispersion spectral regions. A method includes transporting a plurality of optical carriers of different wavelengths over an optical link using wavelength division multiplexing, the optical link including a plurality of optical segments. The plurality of optical channel center wavelengths defined by the plurality of optical carriers are clustered proximate an average value of a zero-dispersion wavelength of the optical link, or near either a) a low wavelength edge or b) a high wavelength edge of a range of zero-dispersion wavelengths of the optical link and a plurality of optical channel center frequencies defined by the plurality of optical channel center wavelengths are non-uniformly spaced apart.
Abstract:
An improved optical add/drop multiplexer (Fig. 1) design is disclosed which utilizes flexible band tunable filters (111, 112) and colorless demultiplexers (130) to process any contiguous group of channels. A modular optical add/drop architecture is also disclosed which allows additional processing capabilities to be added module by module in a cost-effective fashion.
Abstract:
The present invention provides a system, apparatus and method for modularly adapting a network node architecture to function in one of a plurality of potential node types. The architecture includes a configurable switching element, integrated optics, and a plurality of modules that allow a "type" of node to be adapted and configured within the base architecture. The module interfaces may be optical or electrical and be used to construct various different types of nodes including regenerators, add/drop nodes, terminal nodes, and multi-way nodes using the same base architecture.
Abstract:
An add-filter device includes a plurality of ring resonators that are arranged to receive an optical signal of a specific wavelength and channel to be added onto a bus line that is arranged to receive a plurality of signals. At least one Mach-Zehnder Interferometer (MZI) structures embedded in the plurality of ring resonators. The at least one MZI structure and ring resonators provide the necessary modulation and filtering so that the optical signal can be added to the bus line without affecting the channels contained in the bus line.
Abstract:
An optical connection arrangement is provided in an optical path to facilitate changing optical add/drop multiplexer (OADM) and other optical component modules while optical traffic is present on the optical path, with minimal interruption to such traffic. The connection arrangement has a plurality of optical ports to each of which an optical component can be coupled, and one or more optical switches which can be controlled to selectively include in the optical path or bypass each optical port. Such connection arrangements can be coupled in series and/or in parallel for convenient modular add/drop configurations and for opposite directions of transmission of optical traffic on respective optical paths.