CN111596409B - Optical transmission system, scheduling node, multiplexing node, and demultiplexing node - Google Patents
Optical transmission system, scheduling node, multiplexing node, and demultiplexing node Download PDFInfo
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- CN111596409B CN111596409B CN201910127586.0A CN201910127586A CN111596409B CN 111596409 B CN111596409 B CN 111596409B CN 201910127586 A CN201910127586 A CN 201910127586A CN 111596409 B CN111596409 B CN 111596409B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
- G02B6/29386—Interleaving or deinterleaving, i.e. separating or mixing subsets of optical signals, e.g. combining even and odd channels into a single optical signal
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Abstract
The embodiment of the application provides an optical transmission system, a scheduling node, a combining node and a splitting node, wherein the optical transmission system can comprise the combining node and the splitting node, the combining node comprises at least two first optical path selecting devices and an optical path synthesizing device, optical path signals received by the at least two first optical path selecting devices are synthesized through the optical path synthesizing device, and the two synthesized optical path signals are sent; the wave combining node can realize a combined light path selection device, flexibly adjust the transmission rate of an optical signal, namely flexibly adjust a grid for optical signal transmission, so as to adjust the channel interval of the optical signal, provide the optimal channel interval according to the rates of different electrical layers, simultaneously provide more signal input ports, improve the access capability of the wave combining and splitting function, be suitable for the application scene of the multi-rate hybrid networking and simultaneously realize the function of light splitting protection.
Description
Technical Field
The present application relates to the field of optical transmission technologies, and in particular, to an optical transmission system, a scheduling node, a combining node, and a demultiplexing node.
Background
With the development of information technology, the demand of bandwidth of the internet is also rapidly increasing, an optical transmission technology is generally adopted for data interconnection between data center parks, and the optical transmission technology is a technology for transmitting data in an optical signal form between a sender and a receiver, however, due to the slow iteration of the existing optical layer technology in the optical transmission technology, the optical layer technology cannot be flexibly applied to various optical transmission application scenarios.
Disclosure of Invention
Aspects of the present disclosure provide an optical transmission system, a scheduling node, a multiplexing node, and a demultiplexing node, which are used to flexibly adjust a channel interval of an optical signal and provide a plurality of optical signal transmission ports.
An embodiment of the present application provides an optical transmission system, including: a wave combining node and a wave splitting node; the wave combining node comprises at least two first optical path selection devices and an optical path synthesis device connected with the at least two first optical path selection devices; the wavelength division node comprises at least two second optical path selection devices and optical path separation devices connected with the at least two second optical path selection devices; the at least two first light path selection devices respectively receive light path signals, the received light path signals are synthesized through the light path synthesis device, and the light path synthesis device sends two paths of synthesized light path signals; the optical path separating device receives the two paths of synthesized optical path signals, and sends one path of synthesized optical path signals to the at least two second optical path selecting devices respectively so as to obtain corresponding optical path signals.
The embodiment of the application also provides a scheduling node, a wave combination node and a wave division node connected with the wave combination node; after receiving the two paths of synthesized light path signals, the light path separating device in the wavelength division node respectively sends the one path of synthesized light path signals to the at least two corresponding second light path selecting devices, and the at least two second light path selecting devices send the obtained corresponding light path signals to the corresponding first light path selecting devices; the at least two first light path selection devices send the acquired corresponding light path signals to the light path synthesis device for synthesis so that the light path synthesis device sends two paths of synthesized light path signals; the first optical path selection device and the second optical path selection device may adjust a transmission frequency.
The embodiment of the application also provides a wave-combining node, which comprises at least two first light path selecting devices and a light path synthesizing device connected with the at least two first light path selecting devices; the at least two first light path selection devices respectively receive light path signals, the received light path signals are synthesized through the light path synthesis device, and the light path synthesis device sends two paths of synthesized light path signals; the first optical path selection device may adjust a transmission frequency.
The embodiment of the present application further provides a wave splitting node, which includes at least two second optical path selecting devices and an optical path separating device connected to the at least two second optical path selecting devices; the optical path separating device receives the two paths of synthesized optical path signals, and respectively sends one path of synthesized optical path signals to the at least two corresponding second optical path selecting devices to obtain corresponding optical path signals; the second optical path selection device may adjust a transmission frequency.
In this embodiment, the optical transmission system may include a combining node and a splitting node, where the combining node includes at least two first optical path selecting devices and an optical path synthesizing device, and synthesizes optical path signals received by the at least two first optical path selecting devices through the optical path synthesizing device, and sends two synthesized optical path signals; the wave combining node can realize a combined light path selection device, flexibly adjust the transmission rate of an optical signal, namely flexibly adjust a grid for optical signal transmission, so as to adjust the channel interval of the optical signal, provide the optimal channel interval according to the rates of different electrical layers, simultaneously provide more signal input ports, improve the access capability of the wave combining and splitting function, be suitable for the application scene of the multi-rate hybrid networking and simultaneously realize the function of light splitting protection.
The wavelength division node comprises at least two second optical path selection devices and optical path separation devices; the optical path separation device sends one path of synthesized optical path signals to at least two corresponding second optical path selection devices respectively to obtain corresponding optical path signals; the at least two first light path selection devices correspond to the at least two second light path selection devices, so that the wavelength division node can flexibly receive optical signals according to the transmission rate of the optical signals, provide the optimal channel interval for the rates of different electrical layers, and simultaneously provide more ports for meeting the transmission of the optical signals of the wavelength combination node, so that the wavelength division node is suitable for the application scene of the multi-rate hybrid networking, and the wavelength combination/demultiplexing function is completed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of an optical transmission system according to an exemplary embodiment of the present application;
fig. 2 is a schematic structural diagram of an optical transmission system according to still another exemplary embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical transmission system according to another exemplary embodiment of the present application;
fig. 4 is a schematic structural diagram of a scheduling node according to an exemplary embodiment of the present application;
fig. 5 is a schematic structural diagram of a wave combining node according to an exemplary embodiment of the present application;
fig. 6 is a schematic structural diagram of a wavelength division node according to an exemplary embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
With the development of cloud computing, the demand for bandwidth of the internet is also rapidly increasing. Data interconnection between the data center parks of a network is generally realized by adopting an optical transmission technology, and the optical transmission technology can be decomposed into an optical layer and an electrical layer. The optical layer comprises components such as wavelength combination and splitting, optical amplification, optical protection and the like, and the electrical layer refers to a client side gray light unit and a line side color light unit, wherein the C-waveband dense wavelength division multiplexing of the transmission line side of optical signals can contain 96 wavelengths based on 50GHz intervals, and if a single-wave 200G technology is adopted, the single-fiber capacity can reach 19.2T. In general, the optical layer technology has a slow iteration cycle, and the traditional method is based on a 50 GHz-based dense Wavelength Division multiplexing (dwdm) fixed grid, and once used, the fixed grid is not easy to replace. The technology iteration cycle of the electrical layer is fast, the single wave speed is continuously increased from 100G to 200G, 400G and 600G in recent years, and the technology is further developed to a high speed in the future. Therefore, the conventional 50GHz fixed grid can not meet the requirement of the electrical layer speed gradually, and the situation that the optical layer limit can not continuously support the electrical layer technology development is gradually highlighted.
By combining with the scene of Optical Multiplex Section Protection (OMSP), the embodiment of the application can double the number of ports of the wavelength combining and splitting node and flexibly adjust the grids to support multi-rate hybrid networking.
In this embodiment, the optical transmission system may include a wavelength multiplexing node and a wavelength demultiplexing node, where the wavelength multiplexing node includes at least two first optical path selecting devices and an optical path synthesizing device, synthesizes optical path signals received by the at least two first optical path selecting devices through the optical path synthesizing device, and sends two synthesized optical path signals; the wave combining node can realize a combined light path selection device, flexibly adjust the transmission rate of an optical signal, namely flexibly adjust a grid for optical signal transmission, so as to adjust the channel interval of the optical signal, provide the optimal channel interval according to the rates of different electrical layers, simultaneously provide more signal input ports, improve the access capability of the wave combining and splitting function, be suitable for the application scene of the multi-rate hybrid networking and simultaneously realize the function of light splitting protection.
The wavelength division node comprises at least two second optical path selection devices and optical path separation devices; the optical path separation device sends one path of synthesized optical path signals to at least two corresponding second optical path selection devices respectively to obtain corresponding optical path signals; the at least two first light path selection devices correspond to the at least two second light path selection devices, so that the wavelength division node can receive optical signals flexibly according to the transmission rate of the optical signals, optimal channel intervals are provided for different electrical layer rates, and meanwhile, the wavelength division node can also provide more ports to meet the transmission of the optical signals of the wavelength combination node, so that the wavelength division node is suitable for the application scene of the multi-rate hybrid networking, and the wavelength combination/demodulation function is completed.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an optical transmission system according to an exemplary embodiment of the present application. As shown in fig. 1, the optical transmission system 100 includes: a demultiplexing node 101 and a multiplexing node 102.
The wave combining node 101 comprises at least two first optical path selecting devices and an optical path synthesizing device connected with the at least two first optical path selecting devices; the at least two first light path selection devices respectively receive light path signals, the received light path signals are synthesized through the light path synthesis device, and the light path synthesis device sends two paths of synthesized light path signals.
The first Optical path selection device is a device that can be used to implement a new generation technology of a dynamically Reconfigurable Optical Add/Drop Multiplexer (ROADM), has a mesh architecture, and can support functions of any port wavelength, such as a wavelength Selective switch WSS (wavelength Selective switch), which can also be called a wavelength Selective switch, and the WSS has a wide frequency band and low dispersion, and simultaneously supports an inherent port-based wavelength definition (chromatic) characteristic, and adopts a free space Optical switching technology, and has fewer upstream and downstream wavenumbers and fewer upstream and downstream ports, but can support higher dimensions, more integrated components, and complicated control, and can adjust the transmission frequency of an Optical signal (i.e., an Optical path signal).
The optical path combining device refers to a device for realizing optical signal combining, such as a coupler and a filter. The coupler is a device for realizing optical signal combining, for example, a 2x2 coupler, and a 2x2 coupler is a device for realizing optical signal combining, in which 2 input optical signals are input from 2 input ports thereof and output from 2 output ports thereof, so that functions of combining light and splitting light are realized, each output port contains 2 input optical signals, and the optical signals of each input port are averagely split into 2 output ports.
A filter is a device that filters waves, and may also combine optical signals by allowing signals of different frequencies to pass through. The coupler combines and divides signals from the angle of optical power, and the filter combines and divides signals from the angle of optical frequency, so as to complete the functions of frequency division multiplexing and demultiplexing.
For example, as shown in fig. 5, the wave combining node 500 may include a wave combiner composed of two WSSs and 12 × 2 couplers connected to the two WSSs, where the number of input ports of the wave combiner is the sum of the number of 2 WSS ports, the output ports of the wave combiner are output ports of the couplers, there may be 2, and the two WSSs are connected to the input ports of the couplers through respective output ports, and are used as 2-way diplexers for OMSP protection.
In a machine room in a network data park, data transmission in a network can be carried out between all terminals in the machine room through an electric layer, and when a plurality of terminals in the machine room need to carry out data transmission in a remote network with a plurality of terminals in other external machine rooms, data transmission can be carried out through an optical transmission system, so that the functions of large capacity and remote transmission are completed. The multiple terminals output data to be transmitted through an electrical layer, and convert multiple electrical signals carrying the data into multiple optical signals through a photoelectric conversion device, such as a photoelectric converter, the multiple optical signals are transmitted to two WSSs in the wave combining node 101, the two WSSs transmit the multiple optical signals according to the transmission frequencies of their respective ports, and send the multiple optical signals to a 2x2 coupler, the 2x2 coupler combines the multiple optical signals into one optical signal, and outputs the one optical signal through two output ports of the coupler, that is, outputs two identical optical signals from the wave combining node 101, where the one optical signal is used as an alternative optical signal of the other optical signal, and when the one optical signal is unexpectedly interrupted or cannot reach a destination, the other optical signal may also continue to be transmitted, and is used as 2-way dual emission for OMSP protection. The multiplexing node 101 not only completes multiplexing, but also completes the optical splitting and dual-emitting functions of the OMSP protection.
It should be noted that the terminal may be any device with certain computing capability, for example, a smart phone, a notebook, a pc (personal computer) computer, etc. The basic structure of the terminal comprises: at least one processor. The number of processors depends on the configuration and type of the terminal. The terminal may also include Memory, which may be volatile, such as RAM, non-volatile, such as Read-Only Memory (ROM), flash Memory, etc., or both. The memory typically stores an Operating System (OS), one or more application programs, and may also store program data and the like. Besides the processing unit and the memory, the terminal also comprises some basic configurations, such as a network card chip, an IO bus, a camera, an audio and video component, and the like. Optionally, the terminal may also include some peripheral devices, such as a keyboard, mouse, stylus, printer, etc. Other peripheral devices are well known in the art and will not be described in detail herein.
In addition, when the filter is used as an optical path synthesizing device, the number of input ports of the filter is the sum of the number of 2 WSS ports, the number of output ports of the filter is the output port of the synthesizer, and the number of the output ports of the filter can be 1, at this time, the filter directly sends out an optical signal with an allowable output frequency as one optical signal, and the filter cannot be used for 2-way double sending of OMSP protection.
The wavelength division node 102 includes at least two second optical path selecting devices and optical path separating devices connected to the at least two second optical path selecting devices; the optical path separating device receives the two paths of synthesized optical path signals, and sends one path of the synthesized optical path signal to the at least two corresponding second optical path selecting devices respectively so as to obtain corresponding optical path signals.
The second optical path selecting device and the first optical path selecting device are both devices with the same structure and technology, and may be wavelength selective switches WSSs, the transmission frequency may be adjusted, and at least two first optical path selecting devices correspond to at least two second optical path selecting devices, for example, as shown in fig. 2, a WSS1 in the multiplexing node 101 corresponds to a WSS1 in the demultiplexing node 102, a WSS2 in the multiplexing node 101 corresponds to a WSS2 in the demultiplexing node 102, and the corresponding WSSs have the same transmission frequency.
The optical path splitting device refers to a device for splitting an optical signal, for example, an optical splitter and a filter, where the optical splitter is also called an optical splitter, such as a 1x2 coupler, and the 1x2 coupler refers to that an optical signal input by 1 input port is input from the 1 input port, and an optical signal output by 2 output ports is output from the 1 input port, so that both the optical splitting function is achieved, and each output port includes an optical signal that is equally distributed from optical power to the 2 output ports of the 1 input optical signal.
It should be noted that, in addition to the function of splitting the optical signal, the filter is implemented by allowing signals of different frequencies to pass through, such as an interleaver comb filter, a band filter, and the like.
For example, as described above, as shown in fig. 6, the wavelength division node 600 may include a combiner composed of two WSSs and 1 optical splitter connected to the two WSSs, and when a filter is used as the optical path synthesizing device in the combiner 101, there may be 1 input port of the optical splitter, that is, the input port of the optical splitter, and two output ports of the optical splitter are respectively connected to the input ports of one WSS, and the number of the output ports of the optical splitter is the sum of the number of 2 WSS ports. The optical splitter will receive an optical signal sent by a filter in the multiplexing node 101, divide the received optical signal into 2 paths, each path of optical signal will be reduced to half of the original optical power, but the optical signal is not reduced, these two paths of optical signals respectively enter 2 WSSs for selective filtering, each WSS selects an optical signal corresponding to the transmission frequency to transmit according to its own transmission frequency, and the electrical signal is sent to a corresponding terminal in a machine room to which the multiplexing node 102 belongs through photoelectric conversion.
Further, when a 2x2 coupler is used as the optical path combining device in the multiplexing node 101, there may be 2 input ports of the demultiplexer, and at this time, as shown in fig. 6, the optical path splitting device is connected with an optical path switch, for example, the input port of the demultiplexer is connected with the output port of the optical switch, the input port of the demultiplexer is 2 input ports of the optical switch, the output port of the optical switch is connected with the input port of the demultiplexer, and the number of the output ports of the demultiplexer is the sum of the number of 2 WSS ports.
At this time, the optical switch receives two paths of optical signals sent by the coupler in the multiplexing node 101, the optical switch completes 2 paths of selective reception protected by the OMSP, the optical switch selects one path of optical signal to be used as an input optical signal of the optical splitter for transmission, the optical splitter divides the received path of optical signal into 2 paths, each path of optical signal can be reduced to half of the original optical power without reduction of the optical signal, the two paths of optical signals respectively enter 2 WSSs for selective filtering, each WSS selects an optical signal corresponding to the transmission frequency according to the transmission frequency of the WSS to transmit, and the optical signal is sent to a corresponding terminal in a machine room to which the multiplexing node 102 belongs through photoelectric conversion.
An optical switch is an optical device with one or more selectable transmission ports, and functions to physically switch or logically operate optical signals in an optical transmission line or an integrated optical circuit.
As shown in fig. 2, when the multiplexing node 101 is connected to the demultiplexing node 102, in order to better complete OMSP protection, two optical signals are output by the 2 × 2 coupler in the multiplexing node 101 and received by the optical switch of the demultiplexing node 102, wherein, in order to compensate for the loss of the optical signal caused by the optical splitter, that is, to compensate for the problem of the increase of the overall insertion loss, an amplifier 201 may be connected to the demultiplexing node 102 at the receiving end to compensate, without causing significant performance degradation.
In some examples, the transmission frequencies of the optical path signals of at least two first optical path selection devices are set by the controller, and the transmission frequency of each optical path selection device is different; setting the transmission frequency of optical path signals of at least two second optical path selection devices through a controller, wherein the transmission frequency of each optical path selection device is different; wherein, at least two first optical path selection devices and corresponding second optical path selection devices have the same transmission frequency.
For example, as described above, as shown in fig. 2, the transmission frequencies of the respective multiple input ports of two or more WSSs in the multiplexing node 101 can be set by the controller disposed on the control terminal, and the transmission frequencies of each input port of the two or more WSSs are guaranteed to be different, so that there is no wavelength conflict between the WSS1 and the WSS 2. The wavelength division node 102 may also set the transmission frequencies of the respective multiple output ports of its two or more WSSs through a controller disposed on the control terminal, and ensure that the transmission frequencies of each output port of the two or more WSSs are different, so that there is no wavelength collision between the WSS1 and the WSS 2.
During the combining and demultiplexing processes of the combining node 101 and the demultiplexing node 102, the WSS1 in the combiner and the WSS1 in the demultiplexer are kept consistent in filter characteristics (i.e., transmission frequency), and the WSS2 in the combiner and the WSS2 in the demultiplexer are kept consistent in filter characteristics, so as to complete the combining and demultiplexing functions.
It should be understood that when the multiplexing node 101 includes a plurality of WSSs, then when a coupler is selected, a corresponding coupler, such as an nxn coupler, needs to be selected, where n represents the number of WSSs.
In this embodiment, since the optical layer mainly includes a multiplexer/demultiplexer unit, if the awg (arrayed Waveguide grating) is used as the optical path selection device, it supports several fixed grids of 37.5GHz, 50GHz, 75GHz, and 100GHz, and supports a larger number of ports (for example, greater than 80 ports), and the disadvantage is that once a certain grid is used, the grid size cannot be changed, and the optimal channel spacing cannot be matched according to the electrical layer rate. If a smaller grid (e.g., 50GHz) is used, the spectrum can be used more finely, increasing single-fiber capacity, but signals with higher baud rates (e.g., greater than 50GBaud) cannot be supported; if a larger grid (e.g., 100GHz) is adopted, the mixed transmission at multiple rates (e.g., 100G-600G) can be compatible, but the utilization rate of the frequency spectrum resources is reduced, so that the single-fiber capacity is reduced. And the WSS-based optical path selection device can realize flexible grids, the granularity of bandwidth adjustment can reach 6.25GHz, the number of ports is ensured, and the problems are reduced.
As shown in fig. 3, when the wavelength division node 102 uses a filter as an optical path splitting device, and the multiplexing node 101 uses a coupler as an optical path combining device, the input port of the filter needs to be connected to the output port of the optical switch, and the two output ports of the filter are connected to the input ports of the WSS1 and the WSS2 in the wavelength division node 102, respectively.
When the filter is an Interleaver comb filter, the comb filter decomposes the signal into odd-even channels, and the WSS1 and the WSS2 respectively select corresponding odd-even channels to perform filtering processing.
When the filter is a band filter, the band filter decomposes the signal into 2 bands, and the WSS1 and the WSS2 respectively select corresponding bands to perform filtering processing. Similarly, the loss of the filter can be compensated by the amplifier of the combining node at the receiving end without causing significant performance degradation.
It should be noted that, for the filter, the WSSs in the demultiplexing node 102 need to be adapted to the frequency, or the band, or the channel of the signal that the filter operates through.
In some examples, the optical path synthesizing device sends the two synthesized optical path signals through two different sending ports; the light path separating device is connected with a light path switch; and the optical path separating device selects one path of the synthesized optical path signals from the two paths of the synthesized optical path signals through the optical path switch and transmits the selected path of the synthesized optical path signals to the optical path separating device. It should be noted that, since the present embodiment has been described in detail above, the description is omitted here.
In some examples, the number of input ports of the multiplexing node is the same as the sum of the number of ports of the at least two first optical path selection devices; the number of output ports of the wavelength division node is equal to the sum of the number of ports of the at least two second optical path selection devices.
In some examples, the optical transmission system 100 further includes: scheduling nodes; wherein, the scheduling node includes: the system comprises a wave combination node and a wave division node connected with the wave combination node.
The light path separating device in the wavelength division node receives the two paths of synthesized light path signals and respectively sends one path of synthesized light path signals to the at least two corresponding second light path selecting devices, and the at least two second light path selecting devices send the obtained corresponding light path signals to the corresponding first light path selecting devices; and the at least two first light path selection devices send the acquired corresponding light path signals to the light path synthesis device for synthesis, so that the light path synthesis device sends two paths of synthesized light path signals.
As shown in fig. 4, the scheduling node 400 may also be referred to as a Reconfigurable Optical Add-Drop Multiplexer (ROADM) node, and is composed of a multiplexing node 401 and a demultiplexing node 402, where the demultiplexing node 402 in the scheduling node 400 is used as an input end of the scheduling node 400, the multiplexing node 401 is used as an output end of the scheduling node 400, when the demultiplexing node 402 of the scheduling node 400 receives two paths of synthesized Optical signals to be scheduled, the demultiplexing node 402 selects one path of synthesized Optical signals to be scheduled through an Optical switch from the Optical signal, and inputs the Optical signals into WSS1 and WSS2 through an Optical splitter, and the Optical signals are transmitted into WSS1 'and WSS 2' in the multiplexing node 401 in the scheduling node 400 through WSS1 and WSS2, and then transmitted into a 2x2 coupler after passing through WSS1 'and WSS 2', so as to form two paths of synthesized Optical signals for transmission.
The input end of the scheduling node 400 may be connected to the multiplexing node 101 and the output end thereof may be connected to the demultiplexing node 102, and each direction of the scheduling node 400 has the OMSP protection capability. Fig. 4 illustrates 2 dimensions, and assuming that the port numbers of the WSS1, the WSS2, the WSS1 'and the WSS 2' are all N, the entire scheduling node can implement scheduling capability of 2N dimensions. In addition, the configuration operations of the transmission frequencies of the WSS1, the WSS2, the WSS1 'and the WSS 2' are performed by the same controller disposed on the control terminal to ensure that there is no wavelength conflict and to perform the pass-through scheduling function.
Fig. 4 is a schematic structural diagram of a scheduling node according to an exemplary embodiment of the present application. As shown in fig. 4, the scheduling node 400 includes: a multiplexing node 401 and a demultiplexing node 402.
The wave combining node 401 is connected with the wave splitting node 402; a light path separating device in the wavelength division node 402 receives two paths of synthesized light path signals and respectively sends the one path of synthesized light path signals to at least two corresponding second light path selecting devices, and the at least two second light path selecting devices send the obtained corresponding light path signals to corresponding first light path selecting devices; and the at least two first light path selection devices send the acquired corresponding light path signals to the light path synthesis device for synthesis so that the light path synthesis device sends two paths of synthesized light path signals.
Wherein the first optical path selection device and the second optical path selection device can adjust a transmission frequency.
In some examples, the optical path splitting device is connected with an optical path switch; the optical path separating device selects one path of the synthesized optical path signals from the two paths of synthesized optical path signals through the optical path switch and transmits the selected path of synthesized optical path signals to the optical path separating device; the optical path synthesizing device sends two paths of synthesized optical path signals through two different sending ports.
Since the foregoing has described specific embodiments of the present embodiment in detail, further description is omitted here.
Fig. 5 is a schematic structural diagram of a wave combining node according to an exemplary embodiment of the present application. As shown in fig. 5, the multiplexing node 500 includes: the optical path synthesizing device comprises at least two first optical path selecting devices connected with the at least two first optical path selecting devices.
The optical path synthesizing device is used for sending two paths of synthesized optical path signals; the first optical path selecting device may adjust a transmission frequency.
In some examples, the optical path synthesizing device is connected to the scheduling node.
Since the foregoing has described specific embodiments of the present embodiment in detail, further description is omitted here.
Fig. 6 is a schematic structural diagram of a wave-splitting node according to an exemplary embodiment of the present application. As shown in fig. 6, the wavelength division node 600 includes: and the optical path separation device comprises at least two second optical path selection devices connected with the at least two second optical path selection devices.
The optical path separation device receives the two paths of synthesized optical path signals, and respectively sends one path of synthesized optical path signals to the at least two corresponding second optical path selection devices to obtain corresponding optical path signals; the second optical path selection device may adjust the transmission frequency.
In some examples, a light path splitting device is connected to the scheduling node.
In addition, in some of the flows described in the above embodiments and the drawings, a plurality of operations are included in a specific order, but it should be clearly understood that the operations may be executed out of the order presented herein or in parallel, and the sequence numbers of the operations, such as 201, 202, 203, etc., are merely used for distinguishing different operations, and the sequence numbers themselves do not represent any execution order. Additionally, the flows may include more or fewer operations, and the operations may be performed sequentially or in parallel. It should be noted that, the descriptions of "first", "second", etc. in this document are used for distinguishing different messages, devices, modules, etc., and do not represent a sequential order, nor limit the types of "first" and "second" to be different.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by adding a necessary general hardware platform, and of course, can also be implemented by a combination of hardware and software. With this understanding in mind, the above-described aspects and portions of the present technology which contribute substantially or in part to the prior art may be embodied in the form of a computer program product, which may be embodied on one or more computer-usable storage media having computer-usable program code embodied therein, including without limitation disk storage, CD-ROM, optical storage, and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable multimedia data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable multimedia data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable multimedia data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable multimedia data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (14)
1. An optical transmission system, comprising: a wave combining node and a wave splitting node;
the wave combining node comprises at least two first optical path selection devices and an optical path synthesis device connected with the at least two first optical path selection devices;
the at least two first optical path selection devices respectively receive optical path signals, synthesize the received optical path signals through the optical path synthesis device, and send two paths of synthesized optical path signals through the optical path synthesis device;
the wavelength division node comprises at least two second optical path selection devices and an optical path separation device connected with the at least two second optical path selection devices;
the optical path separating device receives the two paths of synthesized optical path signals, and sends one path of synthesized optical path signals to the at least two second optical path selecting devices respectively so as to obtain corresponding optical path signals.
2. The system of claim 1, wherein the transmission frequencies of the optical path signals of the at least two first optical path selection devices are set by the controller, and the transmission frequency of each optical path selection device is different;
setting the transmission frequency of the optical path signals of the at least two second optical path selection devices through a controller, wherein the transmission frequency of each optical path selection device is different;
wherein the at least two first optical path selection devices and the corresponding second optical path selection devices have the same transmission frequency.
3. The system according to claim 1, wherein the optical path synthesizing device sends the two synthesized optical path signals through two different sending ports;
the light path separation device is connected with a light path switch; and the optical path separating device selects one path of synthesized optical path signals from the two paths of synthesized optical path signals through the optical path switch and transmits the selected path of synthesized optical path signals to the optical path separating device.
4. The system of claim 1, wherein the optical transmission system further comprises: scheduling nodes;
wherein the scheduling node comprises: the system comprises a wave combination node and a wave division node connected with the wave combination node;
the optical path separating device in the wavelength division node receives two paths of synthesized optical path signals and respectively sends the one path of synthesized optical path signals to the at least two corresponding second optical path selecting devices, and the at least two second optical path selecting devices send the obtained corresponding optical path signals to the corresponding first optical path selecting devices; and the at least two first light path selection devices send the acquired corresponding light path signals to the light path synthesis device for synthesis, so that the light path synthesis device sends two paths of synthesized light path signals.
5. The system according to any one of claims 1 to 4, wherein the optical path synthesizing device comprises any one of: coupler, filter.
6. The system according to any one of claims 1 to 4, wherein the optical path splitting device comprises any one of: a beam splitter and a filter.
7. The system according to any one of claims 1 to 4, wherein the number of input ports of the multiplexing node is the same as the sum of the number of ports of the at least two first optical path selection devices;
the number of output ports of the wavelength division node is the same as the sum of the number of ports of the at least two second optical path selection devices.
8. The system according to any of claims 1-4, wherein the first optical path selection device is a wavelength selective switch, WSS; the second optical path selection device is a wavelength selection switch WSS.
9. A scheduling node is characterized by a wave combining node and a wave splitting node connected with the wave combining node;
after receiving the two paths of synthesized light path signals, the light path separating device in the wavelength division node respectively sends the two paths of synthesized light path signals to the at least two corresponding second light path selecting devices, and the at least two second light path selecting devices respectively and correspondingly send the obtained corresponding light path signals to the at least two first light path selecting devices; the at least two first light path selection devices send the acquired corresponding light path signals to the light path synthesis device for synthesis, so that the light path synthesis device sends two paths of synthesized light path signals;
the first optical path selection device and the second optical path selection device may adjust a transmission frequency.
10. The node of claim 9, wherein an optical switch is connected to the optical splitting device; the optical path separating device selects one path of synthesized optical path signals from the two paths of synthesized optical path signals through an optical path switch and transmits the selected path of synthesized optical path signals to the optical path separating device;
the optical path synthesizing device sends two paths of synthesized optical path signals through two different sending ports.
11. A wave combining node, characterized by: the optical path synthesizing device comprises at least two first optical path selecting devices and an optical path synthesizing device connected with the at least two first optical path selecting devices;
the at least two first optical path selection devices respectively receive optical path signals, synthesize the received optical path signals through the optical path synthesis device, and send two paths of synthesized optical path signals through the optical path synthesis device;
the first optical path selection device may adjust a transmission frequency.
12. The node of claim 11, wherein the optical path synthesizing device is connected to a scheduling node.
13. A wave-splitting node, characterized by: the optical path separation device comprises at least two second optical path selection devices and an optical path separation device connected with the at least two second optical path selection devices;
the optical path separating device receives the two paths of synthesized optical path signals, and respectively sends one path of synthesized optical path signals to the at least two corresponding second optical path selecting devices to obtain corresponding optical path signals;
the second optical path selection device may adjust a transmission frequency.
14. The node of claim 13, wherein the optical splitting device is coupled to a dispatch node.
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| CN113595644B (en) * | 2021-06-18 | 2023-09-26 | 阿里巴巴新加坡控股有限公司 | Optical transmission device and optical transmission system |
| CN114337822B (en) * | 2021-12-16 | 2024-04-09 | 阿里巴巴（中国）有限公司 | Optical transmission system and data communication system |
| CN114545562B (en) * | 2022-03-25 | 2023-12-26 | 阿里巴巴（中国）有限公司 | Optical fiber connection box, data processing method and computer storage medium |
| CN114944882B (en) * | 2022-05-16 | 2024-06-21 | 烽火通信科技股份有限公司 | Method and system for cutting waves under non-fixed channel interval mixed transmission |
| CN117768056B (en) * | 2023-12-18 | 2024-07-05 | 耀芯电子(浙江)有限公司 | Optical fiber communication method and device based on wavelength division multiplexing |
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