47 results about "Add-drop multiplexer" patented technology

The invention relates to the technical field of wavelength division multiplexing, and particularly provides a sparse representation-based lower wave enhancement method of a reconfigurable optical add-drop multiplexer, which comprises the following steps of: performing conversion processing on a lower wave mixed optical signal to obtain a digital electric signal vector; wherein the lower wave mixed optical signal at least comprises a target signal and an interference signal; performing sparse decomposition processing on the electric signal vector based on the over-complete dictionary to obtain a sparse coefficient vector; wherein the over-complete dictionary at least comprises target signal atoms and interference atoms; identifying and extracting a target coefficient corresponding to the target signal atom from the sparse coefficient vector; and combining the target coefficient with the target signal atoms to obtain an enhanced target signal. According to the sparse representation-based lower wave enhancement method for the reconfigurable optical add drop multiplexer, provided by the invention, the accuracy of extracting a target signal in ROADM lower waves can be improved, and adjacent channel interference and noise are effectively inhibited, so that the performance is improved.

A reconfigurable optical add / drop multiplexer using a wavelength selective switch (WSS) component to multiplex wavelength channels into a wavelength division multiplexed (WDM) signal. When a given channel is dropped, an amplified spontaneous emission (ASE) injection signal is multiplexed as a ghost channel into the WDM signal. The ASE injection channel can mitigate polarization hole burning and can provide a fuller power spectrum density. However, the ASE injection channel also defines a monitoring window. As an optical channel monitor (OCM) monitors the WDM signal, the OCM can detect, within the monitoring window, any underlying characteristic of the given wavelength channel. In this instance in response to the detected characteristic, the WSS component switches from multiplexing the ghost channel into the WDM signal to multiplexing the given wavelength channel into the WDM signal.

Optical add-drop multiplexers (OADMs) connect two or more network terminals in an optical network to perform wavelength division multiplexing. If a channel in an optical connection between an OADM and a terminal is interrupted for any reason such that the signal in the channel drops, transient effects such as spectral hole burning may occur which impacts neighboring channels. One approach to avoiding such transient effects in channel drop scenarios includes filling in the spectral hole so that neighboring channels are transmitted without any degradation. An OADM includes a broad spectral source, such as an amplified spontaneous emission (ASE) source, and an optical switch that replaces dropped channels with ASE. By providing an automatic mechanism for spectrum filling within the OADM itself in this way, high-capacity optical transmission networks are stable against transient effects even in the presence of channel drops or fiber cuts.

Aspects of the subject disclosure may include, for example: receiving traffic pattern data / parameters associated with a reconfigurable optical add-drop multiplexer (ROADM) dense wavelength-division multiplexing (DWDM) network; defining a configuration of the network based upon the traffic pattern data / parameters; outputting the configuration to facilitate physical provisioning and operation of ROADM nodes (and one or more ILA(s), if any) according to the configuration; receiving performance monitoring (PM) data indicative of operation of the network as configured according to the configuration; defining an updated configuration of the network that is based upon the PM data, wherein the updated configuration adds to the network at least one pair of transponders, at least one regenerator, or a combination thereof; and outputting the updated configuration to facilitate physical updating of the network in a manner such that the transponders, the regenerator(s), or the combination thereof is placed into operation. Other embodiments are disclosed.

In an example aspect, an optical switch provided. The optical switch comprises a plurality of reconfigurable add / drop multiplexers (ROADMs), each comprising a plurality of optical line ports and a plurality of add / drop ports. The optical switch also comprises a connection apparatus connecting, for each ROADM, each add / drop port of the ROADM to a port of each of a respective one or more other ROADMs. In another example aspect, a method of configuring an optical switch is provided.

Dynamic segmented DFOS systems and methods operating on bidirectional wavelength division multiplexed (WDM), multi-span optical fiber links using network reconfigurable optical add-drop multiplexers (ROADMs). A distributed sensing interface module (DSIM) is inserted at existing network switching nodes which utilize ROADMs. Operationally, DFOS probe signals occupy one of WDM channel which is switched by the ROADMs in a bidirectional fiber network. The DSIM collects backscattered / reflected sensing signals in one direction, and routes them to an add port of the ROADM in the other direction for conveyance to a DFOS interrogator—after optical filtering and amplification.

A network or system in which a hub or primary node may communicate with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed to receive data carrying optical signals from, and supply data carrying optical signals to, the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, optical splitters / combiners, and optical add / drop multiplexer, for example. Optical subcarriers may be transmitted over such connections, each carrying a data stream. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced. As the bandwidth or capacity requirements of the leaf nodes change, the number of subcarriers, and thus the amount of data provided to each node, may be changed accordingly. Each subcarrier within a dedicated group of subcarriers may carry OAM or control channel information to a corresponding leaf node, and such information may be used by the leaf node to configure the leaf node to have a desired bandwidth or capacity.

According to an aspect, a flexible node design for a high-degree ROADM is provided. In an embodiment, this design is implemented as a network node. The network node includes a plurality of optical input and a plurality of optical outputs. The network node further includes a MEMS (or other Optical Cross Connect, OXC) component and a WSS component, where each of the OXC and the WSS component has a set of inputs of the plurality of optical inputs and a set of outputs of the plurality of optical outputs. In some embodiments, the network node has a set of add inputs supported by one or both of the OXC and WSS components. In some embodiments, the network node has a set of drop outputs supported by one or both of the OXC and WSS components.

The invention provides an innovative architecture design method of a low-loss, color-less, directionless and contention-less reconfigurable optical add drop multiplexer (CDC-ROADM) oriented to a multi-dimensional multiplexing quantum optical network, and the scheme is specially used for optimizing the quantum optical network with large capacity, low blocking and high reliability in the future. Based on special requirements of quantum signal transmission, a quantum signal switching module with high flexibility is designed by innovatively using a low-loss wavelength selective switch (WSS). The classical signal switching module adopts a hierarchical cascade architecture: a space cross connection (SXC) layer realizes fiber core level switching, a wavelength cross connection (WXC) layer supports wavelength / wave group level flexible scheduling, and the use of expensive devices and the construction cost and loss of the system are reduced while the switching flexibility is ensured through a double-level coordination mechanism. The design method provided by the invention has the advantages of low loss, large capacity, efficient transmission, low blocking rate and the like, and can provide key technical support for large-scale deployment of the quantum optical network.

The invention discloses a reconfigurable optical add-drop multiplexer, an optical signal uplink method and an optical signal downlink method. The reconfigurable optical add-drop multiplexer comprises a first band-pass wave combining and separating plate and a configurable M wave combining and separating plate, and the first band-pass wave combining and separating plate is connected with the configurable M wave combining and separating plate; the first band-pass wave combining and dividing plate is used for dividing the received optical signal of the preset wave band into optical signals of a plurality of pass bands; and the configurable M-wave combining and dividing plate is used for receiving the configuration information and performing uplink and downlink operation on the optical signals of the plurality of preset wavelengths in the target passband in the plurality of passbands indicated by the configuration information. According to the reconfigurable optical add-drop multiplexer, the problem that the adaptability of the reconfigurable optical add-drop multiplexer is relatively low due to the fact that the traditional reconfigurable optical add-drop multiplexer performs uplink and downlink operation on the optical signal with the fixed wavelength is solved.

The utility model relates to a kind of space cascade wave division optical add-drop multiplexing technology, specifically a small size compact sparse wave division multiplexing optical add-drop multiplexer module, including multiple single-fiber collimating composite structures and two single-fiber collimating prism assemblies, one single-fiber collimating prism assembly is used as the input end of module, and the other single-fiber collimating prism assembly is used as the output end of module;Multiple single-fiber collimating composite structures are arranged between two single-fiber collimating prism assemblies, and are cascaded in turn. Space cascade is used, compared with three-port device cascade OADM optical add-drop multiplexing module, smaller volume, smaller loss;It can be packaged using CCWDM aluminum box, greatly reducing the volume of use, that is, simple OADM design requirements can be completed, with exquisite structure, great economic value and use value, simple process structure, small volume, convenient production.

The invention is an optical add / drop multiplexor for SDM and wavelength division multiplexed (WDM) signals. SDM signals is an MCF 12a’ are fed through fan out 50a to splitters 24a which sends all wavelengths to a drop unit 30 (e.g. multicast switch (MCS)) and thence transducers 34. Splitter 24a also sends all wavelengths to switch 22 which connects all wavelengths from an input core to output cores. The output cores include coupler 24b where wavelengths from add transducers 42 and unit 40 can be inserted amongst wavelengths passed though the switch. The passed through and added wavelengths then go through fan in 50b to multicore fibre 12e. The invention is intended to avoid the use of filters.

The present application relates to the technical field of wavelength division multiplexing, and particularly provides a down-wave enhancement method of a reconfigurable optical add-drop multiplexer based on sparse representation, which converts and processes a down-wave mixed optical signal to obtain a digitized electrical signal vector; wherein the down-wave mixed optical signal at least includes a target signal and an adjacent channel interference signal; the electrical signal vector is processed by sparse decomposition based on an overcomplete dictionary to obtain a sparse coefficient vector; wherein the overcomplete dictionary at least includes a target signal atom and an adjacent channel interference atom; a target coefficient corresponding to the target signal atom is identified and extracted from the sparse coefficient vector; and the target coefficient is combined with the target signal atom to obtain an enhanced target signal. The down-wave enhancement method of the reconfigurable optical add-drop multiplexer based on sparse representation can improve the accuracy of extracting the target signal in the ROADM down-wave, effectively suppress adjacent channel interference and amplified spontaneous emission noise, and thus improve performance.

A reconfigurable optical add and drop multiplexer (ROADM) system is provided. The ROADM system may include a switching system which includes at least one first WSS optically coupled to a tapping coupler and configured to receive an input optical signal from a first circulator, transmit a drop optical signal to a demultiplexer to drop one or more first wavelength channels, and output a through optical signal. The switching system may also include at least one second WSS optically coupled to the at least one first WSS and a multiplexer and configured to receive an add optical signal to add one or more second wavelength channels, receive the through optical signal, and output an output optical signal to a second circulator, and at least one OCM configured to monitor the input optical signal and the output optical signal.

A system and method are provided for performing a loopback test in a pre-provisioned multi-channel optical network. A controller determines actual spectral availability within an optical spectrum, irrespective of reserved or pre-planned channel allocations, and overrides spectrum reservation limits to define an effective loopback-test bandwidth. The controller configures a selected network-management channel (NMC) and associated modem for the loopback test based on the determined availability, enabling loopback operation even within an occupied or partially utilized spectrum. The system dynamically adjusts modem transmission parameters and establishes spectral guard bands or deadbands as needed to preserve integrity of in-service traffic and mitigate filter roll-off effects. The approach allows flexible, non-disruptive photonic loopback testing in deployed Reconfigurable Optical Add / Drop Multiplexers (ROADMs) or other multi-channel optical environments without re-provisioning the existing channel plan.

Embodiments of the present application provide a reconfigurable optical add-drop multiplexer (ROADM) and an optical communication system. The ROADM includes a light source, a filter, a coherent detection device, a processing module, and a wavelength selective switch (WSS). Based on the optical signal from the calibration of the previous hop ROADM and the alignment of the light source by the coherent detection device, the WSS is calibrated with the optical signal generated by the aligned light source, so that the frequency offset of the WSS can be calibrated more accurately.

An optical add drop multiplexer, OADM, includes a first west port (W1) coupled to a first east port (E1) by a first filter arrangement, the first filter arrangement including a plurality of filter elements and a second west port (W2) coupled to a second east port (E2) by a second filter arrangement to provide a second optical signal path, the second filter arrangement including a plurality of filter elements. The OADM also comprises an interconnection arrangement switchable between: a first mode in which the add ports (A1-A6) are coupled to respective filter elements of the first filter arrangement and the drop ports (D1-D6) are coupled to respective filter elements of the second filter arrangement; and a second mode in which some of the add ports (A1-A6) and some of the drop ports (D1-D6) are coupled to respective filter elements of the first filter arrangement or the second filter arrangement.

A Reconfigurable Optical Add / Drop Multiplexer (ROADM) includes degree components where there are one or more Media Channels (MCs) configured thereon; multiplexer and demultiplexer components; and a controller configured to, responsive to a request for a loopback test on Network Media Channel (NMC) that is part of a configured Media Channel (MC), determine whether there are neighboring channels to the NMC, configure deadbands on optical spectrum based on the determining, cause configuration of a modem for the loopback test, and cause performance of the loopback test with the modem.

The invention provides a radio frequency signal optical fiber synchronous conversion system, and particularly relates to the technical field of signal conversion and transmission. According to the invention, the central station unit platform and the antenna unit platform are interconnected only by adopting one single-core phase-stabilized optical cable, passive optical fiber devices such as an optical wavelength division multiplexer, an optical add drop multiplexer and an optical circulator are fully utilized, an optical path structure is redesigned based on an optical multiplexing technology, and single-core optical fiber two-way transmission of multiple paths of radio frequency signals is realized. And a reliable phase discrimination control module is matched to monitor the link phase drift in real time and feed back and control the delay amount of an optical path to carry out phase tracking compensation of the signal, so that stable-phase optical transmission of the radio-frequency signal is realized. Furthermore, the optical link composition structure under the condition of complex signal transmission is greatly simplified, the problem of inconsistent phase drift of the multi-core optical cable caused by external and self factors is physically avoided through the single-core optical cable interconnection mode, the signal phase is clamped in real time by combining phase monitoring and control, and the signal transmission efficiency is improved. And the signal phase of the radio frequency optical transmission link is ensured to be stable.

The present invention relates to an optical add / drop multiplexer (ROADM), and more particularly, to an optical add / drop multiplexer (ROADM) capable of being reconstructed, and more particularly, to an optical add / drop multiplexer (ROADM) capable of being reconstructed. The ROADM comprises: D optical inputs for receiving optical signals; d first optical switching devices, each first optical switching device being associated with one of the D optical inputs; the second optical switch devices are associated with one of the outputs of the corresponding first optical switch devices, and each second optical switch device fans out the optical signals into N multi-path signals; a third optical switching device combining second output signals received from the corresponding M = D / N of the second optical switching device; the combining device is used for combining N third output signals corresponding to a third optical switch device and providing a group of D optical outputs of the ROADM in use; and the controller is used for being in communication connection with the first, second, third and fourth optical switch devices so as to adjust the on-off states of the first, second, third and fourth optical switch devices.

The invention discloses a wave combiner / splitter board card, an optical signal transmission method, a storage medium and a program product. The wave combining and dividing board card comprises a wave combining and dividing layer which is used for carrying out shunting processing or converging processing on optical signals transmitted in the wave combining and dividing board card according to different wave bands; the filtering layer is used for screening out optical signals of which the wavelengths are candidate service wavelengths from the optical signals of different wavebands; the wavelength selection layer is used for selecting an optical signal of which the wavelength is a target service wavelength from the optical signals of different candidate service wavelengths output by the filtering layer, and routing the optical signal of the target service wavelength to the port convergence layer; and the port convergence layer is used for converging the optical signals of the at least one target service wavelength and outputting the converged optical signals through a target port. According to the reconfigurable optical add-drop multiplexer, the technical problems of high cost and long research and development period due to the fact that most of reconfigurable optical add-drop multiplexers in optical communication systems in related technologies adopt wavelength selection switches to realize multi-band optical signal wave combination and separation are solved.

Embodiments described herein relate to a method and apparatus for configuring an optical network. An optical add / drop multiplexer (OADM) (115a, 215b, 500, 600) is provided, comprising: a first west port (W1) coupled to a first east port (E1) by a first filter arrangement (505a), the first filter arrangement comprising a plurality of filter elements (510a) associated with respective wavelengths (F1-Fn); and a second west port (W2) coupled to the second east port (E2) by a second filter arrangement (505b) to provide a second optical signal path, the second filter arrangement comprising a plurality of filter elements (510b) associated with respective wavelengths (F1-Fn). The OADM further comprises an interconnection arrangement (515) for coupling the filter elements of the first and second filter arrangements (505a, 505b) to the respective insertion ports (A1-A6) or to the respective drop ports (D1-D6), where the interconnection arrangement is switchable between a first mode in which the insertion ports (A1-A6) are coupled to the respective filter elements (510a) of the first filter arrangement (505a) and a second mode in which the drop ports (D1-D6) are coupled to the respective drop ports (D1-D6) of the second filter arrangement (505a). And the branch ports (D1-D6) are coupled to respective filter elements (510b) of the second filter arrangement (505b); and a second mode in which some of the insert ports (A1-A6) and some of the drop ports (D1-D6) are coupled to respective filter elements (510a, 510b) of the first filter arrangement (505a) or the second filter arrangement (505b).

Embodiments described herein relate to methods and apparatuses for providing a reconfigurable optical add-drop multiplexer, ROADM, (300) for use in an optical network. A ROADM comprises a first port (301a); a second port (302a); a third port (305a); and a first switch (307a) configured to: couple the first port to the second port in a first mode; and to couple the first port to the third port in a second mode, wherein: the third port is configured to be coupled to a first transceiver (306a) of a first network node, and the first switch is configured to utilise power supplied by the first transceiver being on to enter the second mode.

A dummy light signal generation apparatus, which can be used in the communication field. The apparatus includes: a light source module configured to generate a first wavelength signal and a second wavelength signal, where the first wavelength signal has N first channels, and the second wavelength signal has M second channels; and a polarization beam combiner configured to polarize and combine the first wavelength signal and the second wavelength signal to output a dummy light signal, where the dummy light signal has N+M channels. A polarization state of a wavelength signal of a dummy light signal on any first channel is orthogonal to a polarization state of a wavelength signal of the dummy light signal on the second channel.

Embodiments of the present application provide a silicon-based liquid crystal device, a wavelength selective switch and an optical add-drop multiplexer, and relate to the technical field of optical devices, and the insertion loss fluctuation of the optical signal emitted by the silicon-based liquid crystal device is small. The silicon-based liquid crystal device comprises a silicon substrate, a liquid crystal layer arranged on the silicon substrate, and at least one super surface layer arranged between the silicon substrate and the liquid crystal layer; the super surface layer comprises a plurality of unit cells arranged in an array; in a first direction, the center position of a group of unit cells in a plurality of groups of unit cells distributed continuously is non-periodically distributed in the first direction, and the first direction is the phase gradient direction of the super surface layer; and / or, the center position of the group of unit cells is non-periodically distributed in a second direction, and the second direction is perpendicular to the phase gradient direction on the super surface layer.

This application provides a tunable optical add / drop multiplexer T-OADM. A beam adjustment apparatus changes an incident angle at which an incident beam is emitted onto an optical filter. After the optical filter splits the incident beam into a transmitted beam and a reflected beam, the beam adjustment apparatus further adjusts a transmission direction of the transmitted beam emergent from the optical filter and a transmission direction of the reflected beam emergent from the optical filter, so that the transmitted beam and the reflected beam are output to corresponding ports, so as to implement a flexible and controllable T-OADM apparatus. This application may be applied to the optical communication field, for example, may be used to implement add / drop multiplexing of tributary signals in an optical domain in fields such as a long-haul backbone and a metropolitan area network.

Aspects of the subject disclosure may include, for example, channel bandwidth allocation to increase effective reconfigurable optical add-drop multiplexer (ROADM) dense wavelength-division multiplexing (DWDM) network capacity. One or more aspects of the subject disclosure may include a method to allocate channel bandwidth efficiently by eliminating one or more guard bands (thereby increasing the usable ROADM DWDM network bandwidth). Other embodiments are disclosed.

This disclosure describes techniques for Optical Add Drop Multiplexers (OADMs) that apply asymmetrical filtering to allow for individual channels within a channel group to be independently added / dropped or passed through. In one example, an optical add-drop multiplexer includes a first input port configured to receive an input signal having a first wavelength channel, a second wavelength channel, and a third wavelength channel; a demultiplexer having a first filter configured to: pass the first wavelength channel and the second wavelength channel, and filter the third wavelength channel; a multiplexer having a second filter configured to: pass the second wavelength channel and the third wavelength channel, and filter the first wavelength channel; and a first output port configured to output an output signal comprising the second wavelength channel of the input signal.

A fiber core power coupler (100) and a fixed optical add-drop multiplexer (700). The fiber core power coupler (100) comprises: a connector (1), wherein a first end of the connector (1) is provided with N first fiber core interfaces (11) and M second fiber core interfaces (12), the first end of the connector (1) is used for connecting a first optical fiber (10), the first optical fiber (10) is provided with N+M fiber cores, each fiber core is correspondingly connected to one first fiber core interface (11) or one second fiber core interface (12), N≥1, and M≥0; and a coupling portion (2), which is internally provided with N single-mode optical fibers (21), wherein each single-mode optical fiber (21) is separately coupled with one first fiber core interface (11), and the coupling portion (2) is used for coupling a signal of a fiber core connected to the first fiber core interface (11) into the corresponding single-mode optical fiber (21), or coupling a signal of the single-mode optical fiber (21) into the fiber core connected to the first fiber core interface (11). The fiber core power coupler (100) and the fixed optical add-drop multiplexer (700) can realize fiber core-specific add-drop with extremely low link loss in a multi-core optical fiber system.