26 results about "Add-drop multiplexer" patented technology

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.

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.

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 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 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.

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 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.

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.

The invention provides a multi-intelligent computing center interconnection scheme based on a wavelength sharing ring, and aims to improve the communication efficiency and the resource utilization rate among intelligent computing centers so as to support efficient model parallelization training. The method comprises three parts: an internet based on a shared wavelength ring is constructed, and each center is equipped with a reconfigurable optical add-drop multiplexer to realize flexible uplink and downlink operation of wavelength resources; on the basis of an interaction mechanism of a triple (time label, duration and topological connection), a model controller and a network controller can efficiently cooperate, and network resources are dynamically configured according to training task requirements; through a cooperation mechanism, close cooperation between a model training process and a network dynamic control process is ensured, and effective distribution and utilization of resources are realized. According to the invention, through sharing the wavelength ring and dynamic resource configuration, the data transmission efficiency between the intelligent computing centers is improved, the waste of network resources is greatly reduced, and an efficient and flexible interconnection solution is provided for model parallelization training.

A method includes collecting values for a plurality of optical parameters from a first reconfigurable optical add / drop multiplexer and a second reconfigurable optical add / drop multiplexer connected by an optical link of an optical network, wherein the first reconfigurable optical add / drop multiplexer and the second reconfigurable optical add / drop multiplexer are provided by different vendors, comparing the values to previously collected values for the plurality of optical parameters, determining, based on the comparing, that a change has been detected in a power value of at least one channel of at least one of: the first reconfigurable optical add / drop multiplexer or the second reconfigurable optical add / drop multiplexer, and sending an instruction to at least one of: the first reconfigurable optical add / drop multiplexer or the second reconfigurable optical add / drop multiplexer to adjust a transmit power of the at least one of: the first reconfigurable optical add / drop multiplexer or the second reconfigurable optical add / drop multiplexer.

Systems and methods of capacity changes in an optical network having a plurality of optical sections include, responsive to a request for a capacity change for a plurality of channels, bundling the plurality of channels into different steps such that all of the plurality of channels are assigned to a step of the different steps; and causing implementation of the different steps across the plurality of optical sections, wherein each section performs the implementation and the bundling between corresponding Optical Add / Drop Multiplexer (OADM) nodes independently and asynchronously from one another.

The application provides a high-reliability optical path multi-hop transmission quality prediction method and system based on cascade learning, which comprises the following steps: acquiring physical link information corresponding to a target service channel; based on a single-hop optical transmission sequence corresponding to the physical link information, performing cascade prediction on the power spectrum between reconfigurable optical add-drop multiplexers to obtain a destination node power spectrum; based on noise parameters corresponding to each single-hop transmission process, acquiring a noise cumulative value; and obtaining a signal-to-noise ratio prediction result of the target service channel according to the destination node power spectrum and the noise cumulative value. The application realizes fine description of power spectrum evolution and signal-to-noise ratio change in the multi-hop optical transmission process, effectively overcomes the problem that a traditional end-to-end model is difficult to adapt to a complex network topology, and improves the accuracy of the signal-to-noise ratio prediction result.

The utility model relates to a wavelength division multiplexing technology, in particular to a miniature fixed optical add-drop multiplexer, which comprises a first device and a second device which are cascaded through a common optical fiber and are four-port devices, and one port of the first device and one port of the second device are used as transmission ports; one of the other three ports of the first device is used as a common port; the other two ports are used as reflecting ends; and one of the other three ports of the second device is used as a common end for outputting optical signals, and the other two ports are used as reflection ends for inputting the optical signals. Compared with a device used for box type packaging in the market, the volume size is obviously reduced, a steel pipe of a branching device can be directly used for packaging, the use volume is greatly reduced, the structure is exquisite, the economic value and the use value are great, the technological structure is simple, the volume is small, and production is convenient.

A ROADM node includes D splitters, D sets of first wavelength selective switches (WSSs), D sets of second WSSs, and D combiners. A set of first WSSs includes N first WSSs, and a set of second WSSs includes N second WSSs. A common port of the splitters is coupled to a first optical fiber, and N branch ports of the splitters are respectively coupled to common ports of the N first WSSs in the set of first WSSs. At least some of K branch ports of the first WSSs are respectively coupled to a plurality of second WSSs, and at least some of K branch ports of the second WSSs are respectively coupled to a plurality of first WSSs. A common port of the combiners is coupled to a second optical fiber, and N branch ports of the combiners are respectively coupled to common ports of the N second WSSs in the set of second WSSs.

Reconfigurable optical add-drop multiplexers (ROADMs) includes D optical inputs that receive optical signals, D first optical switching devices, each first optical switching device being associated with one of the D optical inputs, second optical switching devices associated with one of the outputs of a corresponding first optical switching device, each second optical switching device fans-out the optical signal into N multiple signals, third optical switching devices, that combine second output signals received from a corresponding M=D|N of the second optical switching devices, and combining devices that, in use, combine third output signals of N corresponding third optical switching devices and provide a set of D optical outputs of the ROADM and a controller communicably connected to the first, second, third and fth optical switching devices to adjust a switching state thereof.

The application discloses a kind of all-fiber laser frequency stability transfer system, including main laser, slave laser, acoustooptic modulator, coupler, fiber delay line, temperature controller, PZT, Faraday mirror, optical add-drop multiplexer, optical filter, photoelectric detector, radio frequency frequency synthesizer, frequency discrimination signal generator, servo feedback circuit;Frequency stability of main laser is transferred to fiber interferometer by feedback control to fiber delay line, which is composed of coupler, fiber delay line and Faraday mirror, then the frequency of slave laser is locked on fiber interferometer, and then laser frequency stability transfer is realized.The application only needs a stable main laser, can use the method, obtain multiple slave lasers with the same stability, and the system has the advantages of low cost, simple structure, high stability and the like, and has wide application prospect in the field of quantum precision measurement.