All-optical line switching system based on optical switch network

Abstract

The invention provides an all-optical line switching system based on an optical switch network, and the system comprises an optical switch which is provided with a plurality of optical switch communication modules. An optical line switching matrix is arranged in the optical switch, and the optical line switching matrix comprises a plurality of optical ports; each optical switch communication module is connected with an optical switch communication module of another optical switch or an external switching node communication module, and optical signals transmitted by the optical switch communication module and the optical switch communication module or the switching node communication module of another optical switch are communication light containing data optical signals and management optical signals. The communication light is formed by low-frequency modulation and superposition of a management light signal to a data light signal and / or formed by the management light signal and the data light signal in a wavelength division multiplexing mode; and after receiving the communication light, the optical switch communication module separates the data optical signal from the management optical signal, and transmits the data optical signal to the corresponding optical port. According to the invention, data optical signals and management optical signals can be transmitted simultaneously.

Description

Technical Field

[0001] The present invention relates to the technical field of optical communication devices, and specifically, to an all-optical line switching system based on an optical switch network. Background Art

[0002] With the development of optical fiber communication technology, the integration degree of optical switch devices has increased year by year, and their applications in communication networks have become more and more extensive. Typical application scenarios include optical fiber line switching in passive optical networks and optical fiber line switching in storage area networks, and these application scenarios widely use optical switches. Traditional all-optical line switches only have the function of line switching and do not have the management function of line switching, that is, they can only realize the transmission of data optical signals and cannot control the transmission address of data optical signals.

[0003] The Chinese patent application with the publication number CN109451377A discloses an optical switch based on an integrated hybrid switching technology, which has an optical wavelength switching sub-module and an optical packet switching sub-module. Among them, the optical wavelength switching sub-module is used for switching and transmitting wavelength switching services, and the optical packet switching sub-module is used for switching and transmitting packet switching services. This solution multiplexes the packet switching service into the transmission idle part of the wavelength switching service in a time-division multiplexing mode.

[0004] Since this optical switch needs to demodulate the information related to the switching type (wavelength circuit switching or packet switching) in the high-speed signal to determine the actions of subsequent low-speed switches and high-speed switches, the structure of the optical switch is complex. In addition, since this method multiplexes the packet switching service into the transmission idle part of the wavelength switching service in a time-division multiplexing mode, it is actually a time-division multiplexing transmission method and does not change the communication optical transmission route / fiber. At the same time, in the subsequent parsing process, a special service identification module needs to be used to identify whether the data service transmitted by the optical switch is a wavelength switching service or a packet switching service. This leads to the need to set up a professional service identification module in this type of optical switch to accurately identify the data service, and then perform subsequent processing according to the identified service type. Such a system is not transparent to the rate of optical signals. Once the rates of the transceiver signals change, a new service identification module needs to be configured. In addition, this switch only has a switching function and does not have a line (routing) management function, and it is impossible to build a switching network only based on the switch. Summary of the Invention

[0005] The object of the present invention is to provide an all-optical line switching system with low production cost, capable of simultaneously transmitting data optical signals and management optical signals, and easy to network, maintain and manage.

[0006] To achieve the above object, the all-optical line switching system based on an optical switch network provided by the present invention includes at least one optical switch, and the optical switch has more than two optical switch communication modules; a single-fiber bidirectional transmission mechanism is adopted inside the optical switch, and an M×N port or an optical line switching matrix from any port to any port is arranged inside. The optical line switching matrix includes a plurality of optical ports, and one optical port is connected to one optical switch communication module; each optical switch communication module is connected to an optical switch communication module of another optical switch or an external switching node communication module. The optical signal transmitted between the optical switch communication module and the optical switch communication module of another optical switch or the switching node communication module is a communication optical signal containing a data optical signal and a management optical signal; the communication optical signal is formed by low-frequency modulating and superimposing the management optical signal onto the data optical signal and / or formed by wavelength division multiplexing the management optical signal and the data optical signal; after receiving the communication optical signal, the optical switch communication module separates the data optical signal from the management optical signal and transmits the data optical signal to the corresponding optical port.

[0007] In the present invention, the management optical signal contains various types of control / management information, such as the connection state of the optical switching matrix, connection request information, request response information, etc. After demodulation, the management optical signal can be mainly used to change the transmission line of the data optical signal in the optical line switching matrix, and at the same time, it also provides an independent and effective management information channel for the interconnection and communication between the optical switch and external communication modules / switching nodes.

[0008] As can be seen from the above solution, the optical switch communication module can receive the communication optical signal containing the management optical signal and the data optical signal, and can separate the management optical signal and the data optical signal, so as to transmit the data optical signal to the optical line switching matrix, while the management optical signal is used to select / change the transmission line of the data optical signal in the optical line switching matrix, thereby realizing the control and management of the transmission line of the data optical signal. In this way, the all-optical line switching system based on the optical switch network can transmit the data optical signal and the management optical signal at the same time, simplify the implementation of the all-optical line switching system, and adapt to different types of optical switching networks, such as a typical M×N port switching network or an arbitrary port to arbitrary port switching network.

[0009] In addition, since the data optical signal and the management optical signal are transmitted in a wavelength division multiplexing manner, or the management optical signal is modulated into the data optical signal, when separating the data optical signal and the management optical signal, only a wavelength division multiplexer or a demodulator is needed to achieve separation. The structure for separating the data optical signal and the management optical signal is simple, and it is not necessary to pre-identify the service signal. The all-optical line switching system is transparent to the service / data optical signal, and the system can be compatible with service / data optical signals of different rates and data structures.

[0010] Preferably, the wavelength of the data optical signal is different from that of the management optical signal; the optical switch communication module is provided with a first wavelength division multiplexer and a first circulator. The first wavelength division multiplexer is used to separate the data optical signal and the management optical signal by wavelength and output the separated management optical signal to the first circulator.

[0011] It can be seen that when the wavelength of the data optical signal is different from that of the management optical signal, the optical switch communication module can separate the management optical signal and the data optical signal through the first wavelength division multiplexer. Therefore, bidirectional transmission of communication light can be achieved through a single optical fiber.

[0012] Preferably, the first circulator receives the management optical signal output by the management optical signal transmitting module and outputs the management optical signal to the management optical signal receiving module.

[0013] It can be seen that the first circulator can output the obtained management optical signal to the management optical signal receiving module for further processing of the management optical signal. Moreover, the first circulator can also obtain the management optical signal from the management optical signal transmitting module and transmit it to the first wavelength division multiplexer through the first circulator.

[0014] A further solution is that the switching node communication module has a second wavelength division multiplexer. The second wavelength division multiplexer transmits the data optical signal bidirectionally with the second circulator, and the second wavelength division multiplexer transmits the management optical signal bidirectionally with the third circulator; bidirectional transmission of communication light is achieved between the first wavelength division multiplexer and the second wavelength division multiplexer through a single optical fiber.

[0015] It can be seen that the switching node communication module can separate or combine the data optical signal and the management optical signal through the second wavelength division multiplexer, enabling bidirectional transmission of communication light between the first wavelength division multiplexer and the second wavelength division multiplexer through a single optical fiber, thereby meeting the requirement that the optical switching system can simultaneously transmit the management optical signal and the data optical signal.

[0016] Optionally, the optical switch communication module is provided with a third wavelength division multiplexer and a fourth wavelength division multiplexer. The third wavelength division multiplexer is used to separate the data optical signal and the management optical signal by wavelength and output the separated management optical signal to the fourth wavelength division multiplexer; the fourth wavelength division multiplexer receives the management optical signal output by the third management optical signal transmitting module and outputs the management optical signal transmitted from the third wavelength division multiplexer to the fourth wavelength division multiplexer to the third management optical signal receiving module.

[0017] It can be seen that the optical switch communication module uses two - stage wavelength division multiplexers to split multiple optical signals with different wavelengths, which can meet the transmission of three different - wavelength optical signals.

[0018] A further solution is that the switching node communication module has a fifth wavelength division multiplexer. The fifth wavelength division multiplexer transmits data optical signals bidirectionally with the fourth circulator, and transmits management optical signals bidirectionally with the sixth wavelength division multiplexer. The sixth wavelength division multiplexer receives the management optical signal output by the fourth management optical signal transmitting module, and outputs the management optical signal transmitted from the fifth wavelength division multiplexer to the sixth wavelength division multiplexer to the fourth management optical signal receiving module.

[0019] It can be seen that the switching node communication module is also provided with two - stage wavelength division filters, which can handle the transmission of three different - wavelength optical signals.

[0020] A further solution is that the wavelength of the management optical signal transmitted by the third management optical signal transmitting module is different from the wavelength of the management optical signal received by the third management optical signal receiving module; the wavelength of the management optical signal transmitted by the fourth management optical signal transmitting module is different from the wavelength of the management optical signal received by the fourth management optical signal receiving module; the wavelength of the management optical signal transmitted by the third management optical signal transmitting module is the same as the wavelength of the management optical signal received by the fourth management optical signal receiving module; the wavelength of the management optical signal transmitted by the fourth management optical signal transmitting module is the same as the wavelength of the management optical signal received by the third management optical signal receiving module.

[0021] It can be seen that the system can use two different - wavelength management optical signals, making the wavelength of the upstream management optical signal different from the wavelength of the downstream management optical signal, making the transmission of the management optical signal more flexible.

[0022] An optional solution is that the wavelength of the data optical signal is the same as the wavelength of the management optical signal. The optical switch communication module is provided with a first optical splitter, a fifth circulator, and a sixth circulator. The first optical splitter splits the communication optical signal according to a preset ratio, outputs a part of the communication optical signal to the first management optical signal demodulation module, and outputs the other part of the communication optical signal to the fifth circulator. The fifth circulator receives the management optical signal output by the first management optical signal modulation module, and the fifth circulator outputs the communication optical signal to the sixth circulator.

[0023] It can be seen that although the wavelength of the data optical signal is the same as the wavelength of the management optical signal, the modulation frequency of the data optical signal is much higher than the modulation frequency of the management optical signal. Using the first management optical signal demodulation module can demodulate the management optical signal from the communication optical signal, without the need to set up a data / service identification module to identify the data optical signal, which can reduce the complexity of the optical switching system.

[0024] A further solution is that the sixth circulator is also connected to a low - frequency signal suppression module. It can be seen that the management optical signal is suppressed / filtered by the low - frequency signal suppression module to avoid interference of the management optical signal on the data optical signal.

[0025] A further solution is that the switching node communication module includes a seventh circulator and a second optical splitter. The seventh circulator outputs communication light to the second optical splitter, and the second optical splitter outputs communication optical signals to the third data optical signal receiving module and the second management optical signal demodulation module; the seventh circulator also receives the communication optical signal output by the second management optical signal modulation module.

[0026] It can be seen that the switching node communication module can respectively realize the modulation and demodulation of the management optical signal through the second management optical signal modulation module and the second management optical signal demodulation module, that is, realize the loading and separation of the management optical signal on the data optical signal, so as to meet the requirement of simultaneous transmission of the management optical signal and the data optical signal.

[0027] An optional solution is that the optical switch communication module is provided with a seventh wavelength division multiplexer, an eighth circulator, a ninth circulator and a third optical splitter. The seventh wavelength division multiplexer and the eighth circulator transmit communication light, and the seventh wavelength division multiplexer receives the management optical signal output by the fifth management optical signal transmitting module; the eighth circulator outputs communication light to the third optical splitter, and the third optical splitter outputs communication light to the third management optical signal demodulation module and the ninth circulator; the ninth circulator is also connected to the low-frequency signal suppression module.

[0028] A further solution is that the switching node communication module includes an eighth wavelength division multiplexer and a tenth circulator. Communication light is transmitted bidirectionally between the eighth wavelength division multiplexer and the tenth circulator. The management optical signal received by the eighth wavelength division multiplexer is output to the fifth management optical signal receiving module; the tenth circulator outputs the data optical signal to the fourth data optical signal receiving module, and the tenth circulator also receives the communication optical signal output by the third management optical signal modulation module.

[0029] It can be seen that in this solution, the management optical signal can use two different wavelengths, and the wavelength of the data optical signal is the same as that of one of the management optical signals. Through wavelength division multiplexing technology, the separation of two communication lights with different wavelengths can be realized, and through modulation technology, the requirements of transmitting the data optical signal and the management optical signal with the same wavelength can be realized. Description of the Drawings

[0030] Figure 1 is the structural block diagram of the first embodiment of the all-optical line switching system based on the optical switch network of the present invention.

[0031] Figure 2 is the structural block diagram of the second embodiment of the all-optical line switching system based on the optical switch network of the present invention.

[0032] Figure 3 is the structural block diagram of the optical switch communication module and the switching node communication module in the third embodiment of the all-optical line switching system based on the optical switch network of the present invention.

[0033] Figure 4 It is a structural block diagram of the optical switch communication module and the switching node communication module in the fourth embodiment of the all-optical line switching system based on the optical switch network of the present invention.

[0034] Figure 5 It is a structural block diagram of the optical switch communication module and the switching node communication module in the fifth embodiment of the all-optical line switching system based on the optical switch network of the present invention.

[0035] Figure 6 It is a structural block diagram of the optical switch communication module and the switching node communication module in the sixth embodiment of the all-optical line switching system based on the optical switch network of the present invention.

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Specific embodiments

[0037] The all-optical line switching system based on the optical switch network of the present invention can be applied to application scenarios such as optical fiber line switching in passive optical networks and optical fiber line switching in storage area networks, and can realize bidirectional transmission of data optical signals and management optical signals through a single optical fiber, enabling the all-optical line switching system based on the optical switch network to simultaneously transmit data optical signals and management optical signals, and the structure of the all-optical line switching system is simple.

[0038] The all-optical line switching system based on the optical switch network of the present invention has one or more optical switches. The switch is the core functional component for realizing optical line switching. On the one hand, the optical switch needs to realize the transmission of data optical signals. On the other hand, the optical switch also needs to interact with each host (such as a server or a peer switch port, a lower-layer aggregation switch) for management and control information, such as realizing connection application, connection removal, status feedback, routing status feedback, and other information that needs to be interacted. These management and control information, compared with the information or data in the high-speed data channel, have much lower requirements for data traffic and bandwidth than the information or data in the data channel, but for the entire communication link, the management and control information is the key information for realizing high-speed and effective communication.

[0039] The all-optical line switching system of the present invention is applied to a single-fiber bidirectional transmission system. The system integrates an optical transceiver module, realizes the transmission of control and routing signals based on the optical fiber link, and completes the connection of the specified input optical port and output optical port; in addition, the system interacts control / management information between the optical switch and the communication terminal based on the optical fiber link, facilitating the use of existing network devices, optical fibers or optical cable channels, and simplifying the network physical structure.

[0040] The first embodiment: See Figure 1, the all-optical line switching system of this embodiment has two optical switches, namely the first optical switch 10 and the second optical switch 30. Among them, the first optical switch 10 includes a first optical line switching array 20 and multiple optical switch communication modules, such as the first optical switch communication module 11, the second optical switch communication module 12, the third optical switch communication module 13, the fourth optical switch communication module 14, etc. Among them, the first optical line switching array 20 is provided with multiple optical ports, such as the first optical port 21, the second optical port 22, the third optical port 23, the fourth optical port 24. The number of optical ports is equal to the number of optical switch communication modules and they correspond one by one. Each optical port is correspondingly connected to an optical switch communication module. For example, the first optical port 21 is connected to the first optical switch communication module 11, the second optical port 22 is connected to the second optical switch communication module 12, and so on.

[0041] The structure of the second optical switch 30 is the same as that of the first optical switch 10. Specifically, the second optical switch 30 includes a second optical line switching array 40 and multiple optical switch communication modules, such as the fifth optical switch communication module 31, the sixth optical switch communication module 32, the seventh optical switch communication module 33, the eighth optical switch communication module 34. The optical line switching array 40 is provided with multiple optical ports, including the fifth optical port 41, the sixth optical port 42, the seventh optical port 43, the eighth optical port 44, etc. The number of optical ports is equal to the number of optical switch communication modules and they correspond one by one. Each optical port is correspondingly connected to an optical switch communication module. For example, the fifth optical port 41 is connected to the fifth optical switch communication module 31, the sixth optical port 42 is connected to the sixth optical switch communication module 32, and so on.

[0042] Taking the first optical switch 10 as an example for illustration, the first optical line switching matrix 20 is a switching matrix that can input a data optical signal from any optical port and output a data optical signal from any optical port. Its implementation structure can refer to the optical switch array disclosed in CN119247552A. Therefore, the first optical line switching matrix 20 can receive the signals output by each optical switch communication module. Specifically, the optical switch communication module can transmit the data optical signal to the corresponding optical port and change the input-output relationship of the optical line according to the management optical signal output by each optical switch communication module, so as to realize the optical line management and control of the data optical signal. Figure 1 In it, the dotted line is the transmission optical path of the data optical signal.

[0043] The internal structures of each optical switch communication module are the same. Taking the second optical switch communication module 12 as an example, it realizes communication with the seventh optical switch communication module 33 of the second optical switch 30 through a single optical fiber. Moreover, the optical signal transmitted between the second optical switch communication module 12 and the seventh optical switch communication module 33 is a communication optical signal that includes a data optical signal and a management optical signal. And the communication optical signal is formed by the management optical signal being low-frequency modulated and superimposed on the data optical signal and / or formed by the management optical signal and the data optical signal in a wavelength-division multiplexing manner. Figure 1 The solid line in it is the transmission optical path of the communication optical signal.

[0044] Second Embodiment: Refer to Figure 2 , in the second embodiment of the all-optical line switching system based on an optical switch network, the all-optical line switching system can be provided with only the third optical switch 50. The third optical switch 50 includes a third optical line switching array 60 and multiple optical switch communication modules, including the ninth optical switch communication module 51, the tenth optical switch communication module 52, the eleventh optical switch communication module 53, and the twelfth optical switch communication module 54. The third optical line switching array 60 is provided with multiple optical ports, including the ninth optical port 61, the tenth optical port 62, the eleventh optical port 63, the twelfth optical port 64, etc. The number of optical ports is equal to the number of optical switch communication modules and they correspond one by one. Each optical port is correspondingly connected to an optical switch communication module. For example, the ninth optical port 61 is connected to the ninth optical switch communication module 51, the tenth optical port 62 is connected to the tenth optical switch communication module 52, and so on.

[0045] Each optical switch communication module can be connected to an external switching node through a single optical fiber. Each switching node has a switching node communication module. For example, the ninth optical switch communication module 51 is connected to the first switching node communication module 81 of the first switching node 71 through a single optical fiber, and bidirectional transmission of the communication optical signal can be realized between the ninth optical switch communication module 51 and the first switching node communication module 81. Similarly, the tenth optical switch communication module 52 is connected to the second switching node communication module 82 of the second switching node 72 through a single optical fiber, the eleventh optical switch communication module 53 is connected to the third switching node communication module 83 of the third switching node 73 through a single optical fiber, and the twelfth optical switch communication module 54 is connected to the fourth switching node communication module 84 of the fourth switching node 74 through a single optical fiber, and so on.

[0046] There are various implementation methods for the optical switch communication module and the switching node communication module. Specifically, the communication light transmitted between the optical switch communication module and the switching node communication module includes a data optical signal and a management optical signal. Among them, the data optical signal is an optical signal for transmitting information / data in a single-fiber bidirectional transmission system, and the management optical signal is an optical signal for transmitting management and control information in a single-fiber bidirectional transmission system. The wavelength of the data optical signal and the wavelength of the management optical signal can be the same or different; therefore, the fusion of the data optical signal and the management optical signal can be achieved through multiplexing technologies, such as multiplexing wavelength-division multiplexing technology and non-wavelength-division bidirectional signal separation technology, or multiplexing wavelength-division multiplexing technology and subcarrier modulation technology, or multiplexing subcarrier modulation technology and non-wavelength-division bidirectional signal separation technology; among them, the subcarrier modulation technology can be a transceiver subcarrier modulation technology or a technology of embedding a low-frequency transmission signal in the communication node and receiving the subcarrier signal. The following combines Figures 3 to 6 to introduce the specific structures of the optical switch communication module and the switching node communication module under various implementation methods.

[0047] Third Embodiment: Refer to Figure 3 , in this embodiment, wavelength-division multiplexing technology and non-wavelength-division bidirectional signal separation technology are multiplexed. The communication light transmitted between the optical switch communication module 100 and the switching node communication module 110 includes a data optical signal and a management optical signal. In this embodiment, the wavelengths of the data optical signal and the management optical signal are different. For example, the wavelength of the management optical signal is λ11, and the wavelength of the data optical signal is λ12. Therefore, in this way, wavelength-division multiplexing is used to transmit the data optical signal and the management optical signal in a single optical fiber.

[0048] Specifically, the switching node communication module 110 loads management information, such as address, service demand information, etc., into the management optical signal, and then combines the signal into the optical fiber through the second wavelength-division multiplexer 111. The optical switch communication module 100 extracts the management optical signal from the optical fiber through the first wavelength-division multiplexer 101, and obtains the management information after demodulation, so as to realize the interaction of management and control information between the switching node and the optical switch. Preferably, all management optical signals use the same optical wavelength, which is beneficial to simplifying the design of the system.

[0049] The optical switch communication module 100 is provided with a first wavelength-division multiplexer 101, a first circulator 102, a first management optical signal transmitting module 103, and a first management optical signal receiving module 104. Among them, the first wavelength-division multiplexer 101 can receive the communication light transmitted by the switching node communication module 110 and send the received communication light to the first circulator 102.

[0050] Since the first wavelength division multiplexer 101 can separate optical signals of different wavelengths, it can separate the data optical signal and the management optical signal according to the wavelength. The data optical signal will be transmitted to the optical port corresponding to the optical line switching array, while the management optical signal will be transmitted to the first circulator 102. The first circulator 102 can send the received management optical signal to the first management optical signal receiving module 104. The first management optical signal receiving module 104 performs photoelectric conversion on the received management optical signal and demodulates it to obtain an electrical signal, and then analyzes the management and control requirements for the optical line or the response result of the relevant requirements from the electrical signal. Figure 3 The dashed line in Figure 3 indicates the transmission route of the management optical signal.

[0051] If the optical switch communication module 100 needs to send a management optical signal, the first management optical signal transmitting module 103 generates a management optical signal through electro-optical conversion. The generated management optical signal is an optical signal carrying the management and control requirement information of the optical line or the response result of the relevant requirements, and is transmitted to the first wavelength division multiplexer 101 through the first circulator 102. The first wavelength division multiplexer 101 transmits the data optical signal and the management optical signal to the switching node communication module 110 in a wavelength division multiplexing manner.

[0052] The switching node communication module 110 includes a second wavelength division multiplexer 111, a second circulator 112, and a third circulator 113. The second wavelength division multiplexer 111 separates the management optical signal and the data optical signal according to the wavelength, transmits the data optical signal to the second circulator 112, and transmits the management optical signal to the third circulator 113. The second circulator 112 can transmit the data optical signal to the first data optical signal receiving module 115 and can receive the data optical signal from the first data optical signal transmitting module 114. The third circulator 113 can transmit the management optical signal to the second management optical signal receiving module 117 and can receive the management optical signal from the second management optical signal transmitting module 116.

[0053] If the switching node communication module 110 needs to send a management optical signal, the second management optical signal transmitting module 116 generates a management optical signal through electro-optical conversion and transmits it to the second wavelength division multiplexer 111 through the third circulator 113. The second wavelength division multiplexer 111 transmits the data optical signal and the management optical signal to the optical switch communication module 100 in a wavelength division multiplexing manner.

[0054] Fourth Embodiment: See Figure 4, this embodiment multiplexes wavelength division multiplexing technology and wavelength division multiplexing technology, that is, it is implemented by adopting a two-stage wavelength division multiplexing technology. Therefore, the communication light transmitted between the optical switch communication module 200 and the switching node communication module 210 can include three different wavelengths. For example, the wavelengths of the management optical signals are λ21 and λ22 respectively, and the wavelength of the data optical signal is λ23. Therefore, in this way, wavelength division multiplexing is used to transmit data optical signals and management optical signals in a single optical fiber.

[0055] Specifically, the optical switch communication module 200 is provided with a third wavelength division multiplexer 201, a fourth wavelength division multiplexer 202, a third management optical signal transmitting module 203 and a third management optical signal receiving module 204. Among them, the third wavelength division multiplexer 201 can receive the communication light transmitted by the switching node communication module 210 and send the received communication light to the fourth wavelength division multiplexer 202.

[0056] Since the third wavelength division multiplexer 201 can separate optical signals of different wavelengths, it can separate data optical signals and management optical signals according to wavelengths. The data optical signal with a wavelength of λ23 will be transmitted to the optical port corresponding to the optical line switching array, while the management optical signals with wavelengths of λ21 and λ22 will be transmitted to the fourth wavelength division multiplexer 202. The fourth wavelength division multiplexer 202 can send the received management optical signal to the third management optical signal receiving module 204. The third management optical signal receiving module 204 performs photoelectric conversion on the received management optical signal and demodulates it to obtain an electrical signal, and then analyzes the management, control requirements for the optical line or the response results of relevant requirements from the electrical signal.

[0057] If the optical switch communication module 200 needs to send a management optical signal, the third management optical signal transmitting module 203 generates a management optical signal through electro-optical conversion. The generated management optical signal is an optical signal carrying optical line management, control requirement information or the response results of relevant requirements, and is transmitted to the third wavelength division multiplexer 201 through the fourth wavelength division multiplexer 202. The third wavelength division multiplexer 201 transmits the data optical signal and the management optical signal to the switching node communication module 210 in a wavelength division multiplexing manner.

[0058] The switching node communication module 210 includes a fifth wavelength division multiplexer 211, a fourth circulator 212, and a sixth wavelength division multiplexer 213. The fifth wavelength division multiplexer 211 separates the management optical signal and the data optical signal according to wavelengths, transmits the data optical signal with a wavelength of λ23 to the fourth circulator 212, and transmits the management optical signal to the sixth wavelength division multiplexer 213. The fourth circulator 212 can transmit the data optical signal to the second data optical signal receiving module 215 and receive the data optical signal from the second data optical signal transmitting module 214. The sixth wavelength division multiplexer 213 can transmit the management optical signal to the fourth management optical signal receiving module 217 and receive the management optical signal from the fourth management optical signal transmitting module 216.

[0059] If the switching node communication module 210 needs to send a management optical signal, it generates a management optical signal through electro-optical conversion by the fourth management optical signal transmitting module 216 and transmits it to the fifth wavelength division multiplexer 211 through the sixth wavelength division multiplexer 213. The fifth wavelength division multiplexer 211 transmits the data optical signal and the management optical signal to the optical switch communication module 200 in a wavelength division multiplexing manner.

[0060] It should be noted that in this embodiment, the wavelength of the management optical signal transmitted by the third management optical signal transmitting module 203 is different from the wavelength of the management optical signal received by the third management optical signal receiving module 204, and the wavelength of the management optical signal transmitted by the fourth management optical signal transmitting module 216 is different from the wavelength of the management optical signal received by the fourth management optical signal receiving module 217. However, the wavelength of the management optical signal transmitted by the third management optical signal transmitting module 203 is the same as the wavelength of the management optical signal received by the fourth management optical signal receiving module 217, for example, both are λ21, and the wavelength of the management optical signal transmitted by the fourth management optical signal transmitting module 216 is the same as the wavelength of the management optical signal received by the third management optical signal receiving module 204, for example, both are λ22. Compared with the first embodiment, this embodiment uses two different wavelengths to transmit the management optical signal, that is, the wavelengths of the upstream management optical signal and the downstream management optical signal are different.

[0061] Fifth Embodiment: See Figure 5, in this embodiment, the subcarrier modulation technology and the non-wavelength division bidirectional signal separation technology are reused. The communication light transmitted between the optical switch communication module 300 and the switching node communication module 310 includes a data optical signal and a management optical signal. Moreover, the management optical signal and the data optical signal have the same wavelength. Therefore, the management optical signal is generated by modulating the low-speed management optical signal onto the high-speed data optical signal in a subcarrier modulation manner; while the parsing of the management optical signal is to extract the optical signal of a certain power of the communication light from the optical fiber, and the management / control information is demodulated through low-pass filtering. Another processing method is to directly load the signal of the low-speed management optical signal into the code stream of the high-speed data optical signal. Although the wavelength ranges of the data optical signal and the management optical signal are the same, the modulation frequency of the management optical signal is much lower than that of the data optical signal. The signal modulation frequency in the data optical signal is generally several G to several hundred G, while the signal modulation frequency in the management optical signal is below several M. The modulation frequency of the management optical signal is more than a thousand times lower than that of the data optical signal. At the same time, the low-frequency modulation depth of the signal of the management optical signal is generally about 10% - 20%. Therefore, the management optical signal can be embedded into the data optical signal by means of optical signal modulation, and the management optical signal can be separated from the data optical signal by means of demodulation. The advantage of adopting the scheme that the management optical signal and the data optical signal have the same wavelength is to save optical wavelength channels.

[0062] Figure 5 , the optical switch communication module 300 has a first optical splitter 301, a fifth circulator 302, and a sixth circulator 303. The first optical splitter 301 is used to separate the optical signal in the optical fiber according to power. To ensure suitable bit error rates for both the signal and the control, about 10% of the management optical signal is preferably split, and about 90% of the data optical signal is preferably split. The specific splitting ratio can be determined according to the bit error rate acceptable to the system. The first optical splitter 301 can be implemented by using the fused biconical taper technology, the planar optical waveguide (PLC) technology, or the optical coating film technology.

[0063] The first optical splitter 301 splits the received communication light according to a preset splitting ratio. Among them, the management optical signal part is transmitted to the first management optical signal demodulation module 305 to demodulate the communication light, so as to demodulate the management optical signal. The data optical signal part is transmitted to the fifth circulator 302. The fifth circulator 302 can transmit the communication light to the sixth circulator 303 and then transmit it to the low-frequency signal suppression module 304. In this embodiment, the low-frequency signal suppression module 304 is an active optical filter, and an optical amplifier operating in the APC mode, such as EDFA, SOA, etc., can be used to flatten the optical signal power upward; the power detection and attenuation function of a dynamic power equalizer can also be used to flatten the optical signal power downward, so as to filter out the low-frequency signal (management optical signal) in the optical pulse signal with low-frequency modulation, generate a "clean" data optical signal, and facilitate the modulation generation of the management optical signal at the next-level port of the optical switch. Therefore, the low-frequency signal suppression module 304 can filter out the low-frequency management optical signal, retain the data optical signal, and transmit it to the optical port corresponding to the optical line switching array.

[0064] If it is necessary to output communication light through the optical switch communication module 300, the data optical signal needs to be output to the sixth circulator 303 through the low-frequency signal suppression module 304. The data optical signal incident from the low-frequency signal suppression module 304 can only pass through the sixth circulator 303 unidirectionally and output to the first management optical signal modulation module 306. The first management optical signal modulation module 306 modulates the management optical signal onto the data optical signal, so as to obtain communication light containing the data optical signal and the management optical signal, and output the communication light to the fifth circulator 302. Finally, the fifth circulator 302 outputs it to the switching node communication module 310 through the first optical splitter 301.

[0065] The switching node communication module 210 is provided with a seventh circulator 311 and a second optical splitter 312. The seventh circulator 311 transmits the communication light to the second optical splitter 312. The second optical splitter 312 can output the communication light to the third data optical signal receiving module 313 and the second management optical signal demodulation module 314. The second management optical signal demodulation module 314 obtains the management optical signal by demodulating the communication light.

[0066] When the switching node communication module 310 needs to output communication light, the third data optical signal transmitting module 316 generates a data optical signal and outputs it to the second management optical signal modulation module 315. The second management optical signal modulation module 315 modulates the management optical signal onto the data optical signal to form communication light, and transmits the communication light to the seventh circulator 311, and is transmitted to the first optical splitter 301 through the seventh circulator 311.

[0067] Sixth Embodiment: See Figure 6, in this embodiment, the subcarrier modulation technology and the wavelength division multiplexing technology are reused. Moreover, the management optical signal has two wavelengths, namely λ41 and λ42, and the wavelength of the data optical signal is the same as that of one of the management optical signals, which is λ41.

[0068] The optical switch communication module 400 includes a seventh wavelength division multiplexer 401, an eighth circulator 402, and a ninth circulator 403. The seventh wavelength division multiplexer 401 can receive the communication optical signal transmitted by the switching node communication module 410, and output the communication optical signal with the wavelength of λ41 to the eighth circulator 402. The eighth circulator 402 performs optical splitting according to a preset splitting ratio. The management optical signal part is output to the third optical splitter 405, and then output to the third management optical signal demodulation module 406 by the third optical splitter 405 for demodulation to obtain the management optical signal. The data optical signal part is output to the ninth circulator 403, and then output to the low-frequency signal suppression module 404 by the ninth circulator 403. The low-frequency signal suppression module 404 filters out the low-frequency management optical signal, so as to obtain a pure data optical signal and output it to the optical port corresponding to the optical line switching array. Moreover, the fifth management optical signal transmitting module 407 can output the management optical signal with the wavelength of λ42, which is transmitted to the switching node communication module 410 by the seventh wavelength division multiplexer 401.

[0069] When the optical switch communication module 400 needs to output the communication optical signal, the data optical signal with the wavelength of λ41 from the optical line switching array passes through the low-frequency signal suppression module 404 and the ninth circulator 403 in sequence, and then is output to the eighth circulator 402, and is output to the switching node communication module 410 through the seventh wavelength division multiplexer 401.

[0070] The switching node communication module 410 is provided with an eighth wavelength division multiplexer 411 and a tenth circulator 413. The eighth wavelength division multiplexer 411 outputs the management optical signal with the wavelength of λ42 to the fifth management optical signal receiving module 412, and the fifth management optical signal receiving module 412 analyzes the management optical signal with the wavelength of λ42.

[0071] The eighth wavelength division multiplexer 411 transmits the communication optical signal with the wavelength of λ41 to the tenth circulator 413, and the tenth circulator 413 outputs the communication optical signal to the fourth data optical signal receiving module 416, and the fourth data optical signal receiving module 416 processes the data optical signal.

[0072] When the switching node communication module 410 needs to output the communication optical signal, the fourth data optical signal transmitting module 415 generates a data optical signal and outputs it to the third management optical signal modulation module 414. The third management optical signal modulation module 414 modulates the management optical signal onto the data optical signal to form a communication optical signal, and transmits the communication optical signal to the tenth circulator 413, and finally transmits it to the optical switch communication module 400 through the eighth wavelength division multiplexer 411.

[0073] In this embodiment, the management of the transmission and reception of optical signals between the switching node communication module 410 and the optical switch communication module 400 is divided into two cases. In the first case, the fifth management optical signal receiving module 412 in the switching node communication module 410 receives the management optical signal transmitted by the fifth management optical signal transmitting module 407 in the optical switch communication module 400, and the wavelength of this management optical signal is different from the wavelength of the data optical signal. In the second case, the third management optical signal demodulation module 406 in the optical switch communication module 400 receives the management optical signal modulated by the third management optical signal modulation module 414 in the switching node communication module 410 on the basis of the data optical signal. In this case, the wavelength of the management optical signal is the same as the wavelength of the data optical signal. Therefore, a low-frequency signal suppression module 404 needs to be added to the optical switch communication module 400 to suppress / filter the management optical signal.

[0074] It can be seen that the all-optical line switching system based on the optical switch network can realize the bidirectional communication of data optical signals and management optical signals through a single optical fiber, which can improve the performance of the all-optical line switching system, and there is no need to set up a service identification module. The management optical signal and the data optical signal are fused and separated by means of wavelength division multiplexing or modulation. The all-optical line switching system has a simple structure and low production cost.

[0075] Finally, it should be emphasized that the above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An all-optical line switching system based on an optical switch network, having at least one optical switch, and the optical switch having more than two optical switch communication modules; It is characterized in that ； The optical switch adopts a single-fiber bidirectional transmission mechanism, and an M×N port or an arbitrary port to arbitrary port optical line switching matrix is provided inside. The optical line switching matrix includes a plurality of optical ports, and one of the optical ports is connected to one of the optical switch communication modules; Each of the optical switch communication modules is connected to an optical switch communication module of another optical switch or an external switching node communication module. The optical signal transmitted by the optical switch communication module to the optical switch communication module of another optical switch or the switching node communication module is a communication optical signal containing a data optical signal and a management optical signal. The communication optical signal is formed by the management optical signal being low-frequency modulated and superimposed on the data optical signal and / or formed by the management optical signal and the data optical signal in a wavelength division multiplexing manner; After receiving the communication optical signal, the optical switch communication module separates the data optical signal from the management optical signal and transmits the data optical signal to the corresponding optical port. The management optical signal is used to change the transmission line of the data optical signal of the optical line switching matrix.

2. The all-optical line switching system based on an optical switch network according to claim 1, wherein: The wavelength of the data optical signal is different from the wavelength of the management optical signal; The optical switch communication module is provided with a first wavelength division multiplexer and a first circulator. The first wavelength division multiplexer is used to separate the data optical signal and the management optical signal according to wavelength and output the separated management optical signal to the first circulator; The first circulator receives the management optical signal output by the first management optical signal transmitting module and outputs the management optical signal to the first management optical signal receiving module.

3. The all-optical line switching system based on an optical switch network according to claim 2, wherein: The switching node communication module has a second wavelength division multiplexer. The second wavelength division multiplexer and the second circulator transmit the data optical signal bidirectionally, and the second wavelength division multiplexer and the third circulator transmit the management optical signal bidirectionally; Bidirectional transmission of the communication optical signal is achieved between the first wavelength division multiplexer and the second wavelength division multiplexer through a single fiber.

4. The all-optical line switching system based on an optical switch network according to claim 1, wherein: The optical switch communication module is provided with a third wavelength division multiplexer and a fourth wavelength division multiplexer. The third wavelength division multiplexer is used to separate the data optical signal and the management optical signal according to wavelength and output the separated management optical signal to the fourth wavelength division multiplexer; The fourth wavelength division multiplexer receives the management optical signal output by the third management optical signal transmitting module and outputs the management optical signal transmitted from the third wavelength division multiplexer to the fourth wavelength division multiplexer to the third management optical signal receiving module.

5. The all-optical line switching system based on an optical switch network according to claim 4, wherein: The switching node communication module has a fifth wavelength division multiplexer, which bi-directionally transmits data optical signals with the fourth circulator, and bi-directionally transmits management optical signals with the sixth wavelength division multiplexer; The sixth wavelength division multiplexer receives the management optical signal output by the fourth management optical signal transmitting module, and outputs the management optical signal transmitted from the fifth wavelength division multiplexer to the sixth wavelength division multiplexer to the fourth management optical signal receiving module.

6. The all-optical line switching system based on an optical switch network according to claim 5, wherein: The wavelength of the management optical signal transmitted by the third management optical signal transmitting module is different from the wavelength of the management optical signal received by the third management optical signal receiving module; The wavelength of the management optical signal transmitted by the fourth management optical signal transmitting module is different from the wavelength of the management optical signal received by the fourth management optical signal receiving module; The wavelength of the management optical signal transmitted by the third management optical signal transmitting module is the same as the wavelength of the management optical signal received by the fourth management optical signal receiving module; The wavelength of the management optical signal transmitted by the fourth management optical signal transmitting module is the same as the wavelength of the management optical signal received by the third management optical signal receiving module.

7. The all-optical line switching system based on an optical switch network according to claim 1, wherein: The wavelength of the data optical signal is the same as the wavelength of the management optical signal; The optical switch communication module is provided with a first optical splitter, a fifth circulator and a sixth circulator. The first optical splitter splits the communication optical signal according to a preset ratio, outputs a part of the communication optical signal to the first management optical signal demodulation module, and outputs the other part of the communication optical signal to the fifth circulator. The fifth circulator receives the management optical signal output by the first management optical signal modulation module, and the fifth circulator outputs the communication optical signal to the sixth circulator.

8. The all-optical line switching system based on an optical switch network according to claim 7, wherein: The switching node communication module has a seventh circulator and a second optical splitter. The seventh circulator outputs the communication optical signal to the second optical splitter, and the second optical splitter outputs the communication optical signal to the third data optical signal receiving module and the second management optical signal demodulation module; The seventh circulator also receives the communication optical signal output by the second management optical signal modulation module.

9. The all-optical line switching system based on an optical switch network according to claim 1, wherein: The optical switch communication module is provided with a seventh wavelength division multiplexer, an eighth circulator, a ninth circulator and a third optical splitter. The seventh wavelength division multiplexer bi-directionally transmits the communication optical signal with the eighth circulator, and the seventh wavelength division multiplexer receives the management optical signal output by the fifth management optical signal transmitting module; The eighth circulator outputs the communication optical signal to the third optical splitter, and the third optical splitter outputs the communication optical signal to the third management optical signal demodulation module and the ninth circulator; The ninth circulator is also connected to the low-frequency signal suppression module.

10. The all-optical line switching system based on an optical switch network according to claim 9, wherein: The switching node communication module has an eighth wavelength division multiplexer and a tenth circulator. Communication light is transmitted bidirectionally between the eighth wavelength division multiplexer and the tenth circulator. The management optical signal received by the eighth wavelength division multiplexer is output to the fifth management optical signal receiving module; The tenth circulator outputs the data optical signal to the fourth data optical signal receiving module, and the tenth circulator also receives the communication optical signal output by the third management optical signal modulation module.

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