ROADM and optical switching system

Abstract

The invention provides an ROADM and an optical switching system, which are applied to the field of optical communication. The ROADM includes a first WSS. The first WSS comprises N1 first ports, N2 second ports, N1 third ports and N2 fourth ports. The N1 first ports are used for receiving N1 first optical signals. The N2 second ports are used for receiving N2 single-wavelength second optical signals. The N1 third ports are used for outputting N1 third optical signals. The N2 fourth ports are used for outputting N2 single-wavelength fourth optical signals. The N2 fourth optical signals are obtained based on the N1 first optical signals. The N1 third optical signals are obtained based on the N2 single-wavelength second optical signals. And the N1 first ports and the N1 third ports are ports of a line dimension. And the N2 second ports and the N2 fourth ports are ports of the branch dimension. In the technical scheme provided by the invention, the upper and lower waves of the branch optical signals and the scheduling of the line optical signals are realized through one WSS, and the manufacturing cost of the ROADM can be reduced.

Description

Technical Field

[0001] The present application relates to the field of optical communication, and in particular to a reconfigurable optical add / drop multiplexer (ROADM) and an optical switching system. Background Art

[0002] There are many network nodes in the optical communication system, such as ROADM. ROADM is a device or equipment used in dense wavelength division multiplexing (DWDM) systems. ROADM is located in the middle of the line and can arbitrarily assign wavelengths for uplink and downlink services as needed to achieve flexible scheduling of services. ROADM generally includes a wavelength selective switch (WSS) in the line dimension and a WSS in the branch dimension. The WSS in the line dimension and the WSS in the branch dimension work together to achieve uplink and downlink of branch optical signals. The branch optical signal is a single-wavelength optical signal. The WSS in the line dimension is also used to achieve scheduling of line optical signals. The line optical signal is an optical signal with multiple wavelengths. In practical applications, the manufacturing cost of WSS is high, which leads to a high manufacturing cost of ROADM. Summary of the invention

[0003] The present application provides a ROADM and an optical switching system, which can implement the addition and drop of branch optical signals and the scheduling of line optical signals through a WSS, and can reduce the manufacturing cost of the ROADM.

[0004] In a first aspect, the present application provides a ROADM. The ROADM includes a first WSS. The first WSS includes N first input ports and N first output ports. The N first input ports include N1 first ports and N2 second ports. N1 is an integer greater than 1. N2 is an integer greater than 0. The N1 first ports are used to receive N1 first optical signals, each of which includes at least one first wavelength signal. The N1 first optical signals correspond one-to-one to the N1 first ports. The N2 second ports are used to receive N2 single-wavelength second optical signals. The N2 single-wavelength second optical signals correspond one-to-one to the N2 second ports. The N first output ports include N1 third ports and N2 fourth ports. The N1 third ports are used to output N1 third optical signals, each of which includes at least one third wavelength signal. The N1 third optical signals correspond one-to-one to the N1 third ports. The N2 fourth ports are used to output N2 single-wavelength fourth optical signals. The N2 single-wavelength fourth optical signals correspond one-to-one to the N2 fourth ports. N2 fourth optical signals are obtained based on N1 first optical signals. N1 third optical signals are obtained based on N2 single-wavelength second optical signals. N1 first ports and N1 third ports are ports of line dimension. N2 second ports and N2 fourth ports are ports of branch dimension.

[0005] In an optional manner of the first aspect, the ROADM also includes a combiner. The N first input ports also include a first target input port. The N first output ports also include a first target output port. The combiner is used to receive K upstream optical signals, combine the K upstream optical signals, and obtain a combined optical signal. K is an integer greater than 0. The first target input port is used to receive the combined optical signal. N1 third optical signals include part or all of the wavelength signals in the K upstream optical signals. The first target output port is used to output the optical signal to be split. The combiner is also used to split the optical signal to be split, obtain K downstream optical signals, and output K downstream optical signals. The N1 first optical signals include part or all of the wavelength signals in the K downstream optical signals. By using a combiner, the number of uplink and downlink optical signals can be increased, thereby expanding the performance of the ROADM.

[0006] In an optional manner of the first aspect, the combiner is an arrayed waveguide grating (AWG) or a coupler. The K uplink optical signals and the K downlink optical signals are single-wavelength optical signals.

[0007] In an optional manner of the first aspect, the combiner is a WSS. The K uplink optical signals include optical signals with multiple wavelengths.

[0008] In an optional manner of the first aspect, the ROADM also includes a second WSS. The second WSS includes N1 fifth ports and N1 seventh ports. The N1 fifth ports correspond one-to-one to the N1 first ports. Each group of corresponding fifth ports and first ports are connected to the same coupler or optical switch. The N1 seventh ports and N1 third ports correspond one-to-one, and each group of corresponding seventh ports and third ports are connected to the same coupler or optical switch. When the first WSS fails, the optical signal with line dimension can be scheduled through the second WSS. Therefore, the present application can improve the reliability of the ROADM.

[0009] In an optional manner of the first aspect, the second WSS also includes N2 sixth ports. The N2 sixth ports correspond to the N2 second ports one by one, and each group of corresponding sixth ports and second ports are connected to the same coupler or optical switch. The second WSS also includes N2 eighth ports. The N2 eighth ports correspond to the N2 fourth ports one by one, and each group of corresponding eighth ports and fourth ports are connected to the same coupler or optical switch. When the first WSS fails, the branch optical signal can be added or dropped through the second WSS. Therefore, the present application can improve the reliability of the ROADM.

[0010] In an optional manner of the first aspect, the ROADM also includes a second WSS. The second WSS includes M1 fifth ports, a third target input port, M1 seventh ports and a third target output port. The N first input ports also include a second target input port. The N first output ports also include a second target output port. The third target output port is connected to the second target input port. The second target output port is connected to the third target input port. The M1 fifth ports are used to receive M1 fifth optical signals. The M1 seventh ports are used to output M1 seventh optical signals. The N2 single-wavelength fourth optical signals are N2 wavelength signals in the eastbound optical signal. The eastbound optical signal includes N1 first optical signals and M1 fifth optical signals. The M1 seventh optical signals are obtained based on the N2 single-wavelength second optical signals. By connecting two WSSs, the number of optical signals that the ROADM can schedule can be increased, thereby improving the performance of the ROADM.

[0011] In an optional manner of the first aspect, the second WSS also includes M2 sixth ports and M2 eighth ports. The M2 sixth ports are used to receive M2 single-wavelength sixth optical signals. The M2 eighth ports are used to output M2 single-wavelength eighth optical signals. The M2 single-wavelength eighth optical signals are M2 wavelength signals in the eastbound optical signal. The westbound optical signal includes M1 seventh optical signals and N1 third optical signals. The M2+M1 single-wavelength optical signals include N2 single-wavelength second optical signals and M2 single-wavelength sixth optical signals. The westbound optical signal includes all wavelength signals in the M2+M1 single-wavelength optical signals. By connecting two WSSs, the number of wavelength optical signals that the ROADM can add and drop can be increased, thereby improving the performance of the ROADM.

[0012] In an optional manner of the first aspect, the ROADM also includes a second WSS. The second WSS includes N1 fifth ports and N1 seventh ports. The N1 fifth ports are used to receive N1 first optical signals. The N1 fifth ports correspond one-to-one to the N1 first ports. The corresponding fifth port and the first port are connected to the same coupler. The N1 seventh ports are used to output N1 seventh optical signals. The N1 seventh ports correspond one-to-one to the N1 third ports. The corresponding seventh port and the third port are connected to the same coupler. The second WSS also includes M2 sixth ports and M2 eighth ports. The M2 sixth ports are used to receive M2 single-wavelength sixth optical signals. The M2 eighth ports are used to output M2 single-wavelength eighth optical signals. The N1 seventh optical signals include all wavelength signals in the M2 single-wavelength sixth optical signals. The M2 single-wavelength eighth optical signals are M2 wavelength signals in the N1 first optical signals.

[0013] The second aspect of the present application provides an optical switching system. The optical switching system comprises the ROADM described in the first aspect or any one of the first aspects and another ROADM. The ROADM is used to transmit one third optical signal among N1 third optical signals to another ROADM.

[0014] The third aspect of the present application provides a method for scheduling optical signals, which is applied to a first WSS or a ROADM including the first WSS. The method for scheduling optical signals comprises the following steps: receiving N1 first optical signals through N1 first ports of the first WSS, each first optical signal including at least one first wavelength signal, the N1 first optical signals corresponding to the N1 first ports one-to-one, and N1 being an integer greater than 1; receiving N2 single-wavelength second optical signals through N2 second ports of the first WSS, the N2 second optical signals corresponding to the N2 second ports one-to-one, and N2 being an integer greater than 0; outputting N1 third optical signals through N1 third ports of the first WSS, each third optical signal corresponding to the N2 second ports one-to-one, and N2 being an integer greater than 0; The signal includes at least one third wavelength signal, and N1 third optical signals correspond to N1 third ports in one-to-one correspondence; N2 single-wavelength fourth optical signals are output through N2 fourth ports of the first WSS, and N2 fourth optical signals correspond to N2 fourth ports in one-to-one correspondence, the N2 fourth optical signals are obtained based on N1 first optical signals, and the N1 third optical signals are obtained based on N2 single-wavelength second optical signals, the N1 first ports and the N1 third ports are ports in the line dimension, and the N2 second ports and the N2 fourth ports are ports in the branch dimension.

[0015] In an optional manner of the third aspect, the scheduling method of optical signals also includes the following steps: combining K uplink optical signals through a combiner to obtain a combined optical signal, where K is an integer greater than 0; receiving the combined optical signal through a first target input port of a first WSS, where N1 third optical signals include part or all of the wavelength signals in the K uplink optical signals; outputting the optical signal to be demultiplexed through a first target output port of the first WSS; demultiplexing the optical signal to be demultiplexed through a combiner to obtain K downlink optical signals, where N1 first optical signals include part or all of the wavelength signals in the K downlink optical signals.

[0016] In an optional manner of the third aspect, the N1 first ports of the first WSS correspond to the N1 fifth ports of the second WSS in one-to-one correspondence. Each group of corresponding fifth ports and the first port are connected to the same coupler or optical switch. The N1 third ports of the first WSS correspond to the N1 seventh ports of the second WSS in one-to-one correspondence, and each group of corresponding seventh ports and the third port are connected to the same coupler or optical switch.

[0017] In an optional manner of the third aspect, the N2 sixth ports of the second WSS correspond one-to-one to the N2 second ports of the first WSS, and each group of corresponding sixth ports and second ports are connected to the same coupler or optical switch. The N2 eighth ports of the second WSS correspond one-to-one to the N2 fourth ports of the first WSS, and each group of corresponding eighth ports and fourth ports are connected to the same coupler or optical switch.

[0018] In an optional manner of the third aspect, the first WSS further includes a second target input port and a second target output port. The second target output port is connected to the third target input port of the second WSS, and the second target input port is connected to the third target output port of the second WSS. The scheduling method of optical signals also includes the following steps: receiving M1 fifth optical signals through M1 fifth ports of the second WSS, N2 single-wavelength fourth optical signals are N2 wavelength signals among N1+M1 optical signals, and N1+M1 optical signals include N1 first optical signals and M1 fifth optical signals; outputting M1 seventh optical signals through M1 seventh ports of the second WSS, and the M1 seventh optical signals are obtained based on the N2 single-wavelength second optical signals.

[0019] In an optional manner of the third aspect, the scheduling method of optical signals further includes the following steps: receiving M2 single-wavelength sixth optical signals through M2 sixth ports of the second WSS, and the M2 single-wavelength eighth optical signals are M2 wavelength signals among the N1+M1 optical signals; outputting M2 single-wavelength eighth optical signals through the M2 eighth ports of the second WSS, and the M1+N1 optical signals include M1 seventh optical signals and N1 third optical signals. The M2+M1 single-wavelength optical signals include N2 single-wavelength second optical signals and M2 single-wavelength sixth optical signals. The M1+N1 optical signals include all wavelength signals among the M2+M1 single-wavelength optical signals.

[0020] In an optional manner of the third aspect, the scheduling method of the optical signal also includes the following steps: receiving N1 first optical signals through N1 fifth ports of the second WSS, the N1 fifth ports and the N1 first ports correspond one-to-one, and the corresponding fifth port and the first port are connected to the same coupler; outputting N1 seventh optical signals through N1 seventh ports of the second WSS, the N1 seventh ports and the N1 third ports correspond one-to-one, and the corresponding seventh port and the third port are connected to the same coupler; receiving M2 single-wavelength sixth optical signals through M2 sixth ports of the second WSS; and outputting M2 single-wavelength eighth optical signals through M2 eighth ports of the second WSS, the N1 seventh optical signals including all wavelength signals in the M2 single-wavelength sixth optical signals, and the M2 single-wavelength eighth optical signals are M2 wavelength signals in the N1 first optical signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a first structural diagram of a ROADM provided by an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the optical path of the WSS provided in an embodiment of the present application;

[0023] Figure 3A second structural diagram of the ROADM provided in an embodiment of the present application;

[0024] Figure 4 A third structural diagram of the ROADM provided in an embodiment of the present application;

[0025] Figure 5 A fourth structural diagram of a ROADM provided in an embodiment of the present application;

[0026] Figure 6 A fifth structural diagram of a ROADM provided in an embodiment of the present application;

[0027] Figure 7 A sixth structural diagram of the ROADM provided in an embodiment of the present application;

[0028] Figure 8 A seventh structural diagram of a ROADM provided in an embodiment of the present application;

[0029] Fig. 9 This is a schematic diagram of the structure of the optical switching system provided in this application. DETAILED DESCRIPTION

[0030] The present application provides a ROADM and optical switching system, which can realize the scheduling of the add / drop waves of branch optical signals and line optical signals through a WSS, and can reduce the manufacturing cost of the ROADM. It should be understood that the "first", "second", "target", etc. used in the present application are used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, for the sake of simplicity and clarity, reference numbers and / or letters are repeated in multiple figures of the present application. Repetition does not indicate that there is a strict limiting relationship between various embodiments and / or configurations.

[0031] The ROADM provided in this application is applied to the field of optical communications. In the field of optical communications, ROADM generally includes a wavelength selective switch (WSS) in the line dimension and a WSS in the branch dimension. The WSS in the line dimension and the WSS in the branch dimension work together to realize the addition and removal of branch optical signals and the scheduling of line optical signals. The manufacturing cost of WSS is relatively high, which leads to the high manufacturing cost of ROADM.

[0032] To this end, the present application provides a ROADM. Figure 1 This is the first structural diagram of the ROADM provided by the embodiment of the present application. Figure 1As shown, ROADM 100 includes a first WSS 101. The first WSS 101 includes N first input ports and N first output ports. The N first input ports include X first ports (represented by In1, In2, ..., and InX, respectively) and N2 second ports (represented by A1, A2, ..., and AN2, respectively). The N first output ports include X third ports (represented by OUT1, OUT2, ..., and OUTX, respectively) and N2 fourth ports (represented by D1, D2, ..., and DN2, respectively). X is an integer greater than or equal to N1. The functions of the four ports are described below.

[0033] The X first ports include N1 first ports. N1 is an integer greater than 1. The N1 first ports are used to receive N1 first optical signals. Each first optical signal includes at least one first wavelength signal. For example, each first optical signal includes 92 or 128 wavelengths. The wavelength band of each of the N1 first optical signals can be the same or different. Each of the X first ports is configured with the ability to receive multi-wavelength optical signals. However, in actual applications, due to insufficient business or other factors, the first port can also receive a single-wavelength optical signal or no optical signal.

[0034] The N2 second ports are used to receive N2 single-wavelength second optical signals. N2 is an integer greater than 0. The N2 single-wavelength second optical signals correspond one-to-one to the N2 second ports. Each second optical signal includes a second wavelength signal. In practical applications, the value of N2 can be the same as or different from the value of N1. The N2 single-wavelength second optical signals are referred to as N2 second optical signals or N2 uplink wavelength signals. The wavelength of each of the N2 second wavelength signals can be the same or different. For example, the value of N2 is 4. The wavelengths of the four second wavelength signals are all λ1. For another example, the wavelengths of the four second wavelength signals are λ1, λ1, λ3 and λ5. For another example, the wavelengths of the four second wavelength signals are λ1, λ2, λ3 and λ4.

[0035] The N2 fourth ports are used to output N2 single-wavelength fourth optical signals, each of which includes a fourth wavelength signal. The N2 single-wavelength fourth optical signals are referred to as N2 fourth optical signals or N2 downlink wavelength signals. The wavelengths of the N2 fourth wavelength signals can be the same or different. The N2 fourth optical signals correspond to the N2 fourth ports one by one. The N2 fourth optical signals are obtained based on the N1 first optical signals. Figure 1In the example, the N2 fourth optical signals are the N2 wavelength signals in the N1 first optical signals. For example, the N1 first optical signals include N1×64 wavelength signals, and each first optical signal includes 64 wavelength signals. The N2 fourth optical signals are N2 arbitrary wavelength signals in the N1×64 wavelength signals. The N2 fourth optical signals can be different wavelength signals in the same first optical signal. For example, the value of N2 is 4. A first optical signal in the N1 first optical signals includes 92 wavelength signals (respectively λ1 to λ92). The N2 fourth optical signals are 4 different wavelength signals (for example, λ1 to λ4) in the 92 wavelength signals. The N2 fourth optical signals can also be the same or different wavelength signals in different first optical signals. For example, the 4 first optical signals in the N1 first optical signals include 92 wavelength signals (respectively λ1 to λ92). The N2 fourth optical signals are 4 λ1 wavelength signals in the 4 first optical signals. The 4 λ1 wavelength signals correspond one-to-one to the N2 fourth optical signals. For another example, the N2 fourth optical signals include four wavelength signals (namely λ1, λ1, λ3 and λ4), wherein the first λ1 wavelength signal comes from the first optical signal among the N1 first optical signals, the second λ1 wavelength signal comes from the second optical signal among the N1 first optical signals, the λ3 wavelength signal comes from the fifth optical signal among the N1 first optical signals, and the λ4 wavelength signal comes from the fifth optical signal among the N1 first optical signals.

[0036] The X third ports include N1 third ports. The N1 third ports are used to output N1 third optical signals. Each third optical signal includes at least one third wavelength signal. The N1 third optical signals correspond to the N1 third ports one by one. Each of the X third ports is configured with the ability to output a multi-wavelength optical signal. However, in actual applications, due to insufficient business or other factors, the third port can also output a single-wavelength optical signal or no optical signal.

[0037] N1 third optical signals are obtained based on N2 second optical signals. Figure 1In the example, N1 third optical signals include all wavelength signals in N2 second optical signals. For example, N1 third optical signals include N1×64 wavelength signals, and each third optical signal includes 64 wavelength signals. N2 second optical signals serve as N2 arbitrary wavelength signals among N1×64 wavelength signals. N2 second optical signals can serve as different wavelength signals in the same third optical signal. For example, the value of N2 is 4. A third optical signal among N1 third optical signals includes 92 wavelength signals (respectively λ1 to λ92). N2 second optical signals are 4 different wavelength signals among the 92 wavelength signals (for example, λ1 to λ4). N2 second optical signals can also serve as the same or different wavelength signals in different third optical signals. For example, 4 third optical signals among N1 third optical signals respectively include 92 wavelength signals (respectively λ1 to λ92). N2 second optical signals serve as 4 λ1 wavelength signals among 4 third optical signals. The 4 λ1 wavelength signals correspond one-to-one to the N2 second optical signals. For another example, the N2 second optical signals include four wavelength signals (λ1, λ1, λ3 and λ4 respectively). Among them, the first optical signal among the N1 third optical signals includes the first λ1 wavelength signal, the second optical signal among the N1 third optical signals includes the second λ1 wavelength signal, the fifth optical signal among the N1 third optical signals includes the λ3 wavelength signal, and the fifth optical signal among the N1 third optical signals includes the λ4 wavelength signal.

[0038] The N1 first ports and the N1 third ports are ports in the line dimension. The N2 second ports and the N2 fourth ports are ports in the branch dimension. The ports in the branch dimension connect local communication devices in the up / down wave dimension, such as optical line transceiver units separated from the line side and the client side or ponder transceiver units integrated from the line side and the client side. The optical line transceiver unit and the ponder transceiver unit can be optical channel transport units (OTU). The ports in the line dimension connect devices on the network transmission side, such as optical line units or optical switching units. The optical switching unit can be a ROADM. In subsequent examples, the line-dimensional ports connecting to the ROADM will be described as an example. The first optical signal and the third optical signal are optical signals in the line dimension, referred to as line optical signals. The second optical signal and the fourth optical signal are optical signals in the branch dimension, referred to as branch optical signals. The N1 first ports and the N1 third ports correspond one-to-one. For example, in Figure 1 In the example, In1 corresponds to OUT1, and In2 corresponds to OUT2. The corresponding first port and third port are connected to the same ROADM. The N2 second ports and N2 fourth ports correspond one to one. The corresponding second port and fourth port are connected to the same communication device. Figure 1 In the example, A1 corresponds to D1 and A2 corresponds to D2.

[0039] exist Figure 1 In the example, there can be a corresponding relationship between N2 second optical signals and N2 fourth optical signals. In the corresponding second optical signal and fourth optical signal, the first WSS101 receives the second optical signal from the communication device, and the first WSS101 transmits the fourth optical signal to the same communication device. In the corresponding second optical signal and fourth optical signal, the first WSS101 receives the fourth optical signal from the ROADM, and the first WSS101 transmits the second optical signal to the same ROADM. Therefore, the position distribution of the N2 second optical signals in the N1 third optical signal and the position distribution of the N2 fourth optical signals in the N1 first optical signal can be the same.

[0040] exist Figure 1 In the example of , the N1 third optical signals can also include all wavelength signals except the N2 downstream wavelength signals in the N1 first optical signals. In this case, the N1 third optical signals include all wavelength signals except the N2 downstream wavelength signals in the N1 first optical signals and the N2 upstream wavelength signals. The N2 downstream wavelength signals and the N2 upstream wavelength signals have the same number of wavelengths. Therefore, the number of wavelength signals included in the N1 third optical signals is equal to the number of wavelength signals included in the N1 first optical signals.

[0041] Figure 2 This is a schematic diagram of the optical path of the WSS provided in the embodiment of the present application. Figure 2 As shown, the first WSS 101 includes a first optical path 250 , a second optical path 251 , a third optical path 252 and a fourth optical path 253 .

[0042] The first optical path 250 includes a first imaging optical path 201, a first-level switching engine 202, and a first part of the switching optical path 203. The dot-dashed line in the figure represents the optical axis of the first WSS101. The first imaging optical path 201 includes a lens 211, a grating 212, and a lens 213. The first imaging optical path 201 is used to receive N1 first optical signals from N1 first ports. The figure describes a first optical signal as an example. On the dispersion plane, the grating 212 is used to disperse and expand the incident light beam, and irradiate the incident light beam after the dispersion expansion to the first-level switching engine 202. The direction of light dispersion expansion is called the dispersion direction. The plane where the light of multiple wavelengths is located after the light dispersion expansion is called the dispersion plane. The height plane is perpendicular to the dispersion plane. On the height plane, the first imaging optical path 201 is used to image the incident light beam to the first-level switching engine 202. The embodiment of the present application is mainly described with the optical path of the first WSS101 in the height plane.

[0043] The first-level switching engine 202 can be a silicon-based liquid crystal LCoS (liquid crystal on silicon), a liquid crystal (LC) array or a micro electro mechanical system (MEMS). The first-level switching engine 202 is used to apply a corresponding deflection angle to the light beam according to the wavelength of the light beam to obtain a target light beam. For example, the first optical signal includes two wavelength signals. The first-level switching engine 202 is used to apply different deflection angles to the two wavelength light beams to obtain two light beams with different output angles (one is represented by a solid line with an arrow, and the other is represented by a dotted line with an arrow). The first part of the switching optical path 203 includes a lens 214, a grating 215, a lens 216, a lens 217, a switching engine 218 and a lens 219. The grating 215 is used to combine the target light beam in the dispersion plane. The switching engine 218 is used to change the output port of the target light beam. Two different scenarios are described below.

[0044] In the first scenario, when the output port of the target light beam is the third port, the switching engine 218 irradiates the target light beam to the lens 219. At this time, the target light beam is the third optical signal or one or more wavelength signals in the third optical signal. After passing through the lens 219, the target light beam is irradiated to the second optical path 251 of the first WSS 101. The second optical path 251 of the first WSS 101 includes the second part of the switching optical path 203, the second-level switching engine 204, and the second imaging optical path 205. The second part of the switching optical path 203 includes the switching engine 221, the lens 222, the lens 223, the grating 224, and the lens 225. The grating 224 is used to split the target light beam in the dispersion plane. The first part and the second part of the switching optical path 203 are used to convert the emission angle characteristics of the output light beam of the first-level switching engine 202 into the incident position characteristics of the second-level switching engine 204. The second-level switching engine 204 adjusts the output angle of the target light beam to obtain the third optical signal. The second imaging optical path 205 is used to image the third optical signal output by the second-stage switching engine 204 to the third port.

[0045] In the second scenario, when the output port of the target light beam is the fourth port, the switching engine 218 irradiates the target light beam to the third light path 252. The third light path 252 includes a switching engine 231 and a lens 232. The switching engine 231 is used to irradiate the target light beam to the fourth port through the lens 232. Figure 2 In the example shown, a fourth port is shown.

[0046] The fourth optical path 253 includes a lens 241. The lens 241 is used to receive N2 second optical signals from N2 second ports, and irradiate the N2 second optical signals to the switching engine 221 in the second optical path 251. The embodiment of the present application is described by taking a second optical signal as an example. The switching engine 221 is used to adjust the transmission angle of the second optical signal to adjust the output port of the second optical signal. The second part of the switching optical path 203 is used to irradiate the second optical signal to the second-level switching engine 204. The second-level switching engine 204 adjusts the output angle of the second optical signal to obtain a third optical signal. The second imaging optical path 205 is used to image the third optical signal output by the second-level switching engine 204 to the third port. Figure 2 Two third ports are shown.

[0047] It should be understood that Figure 2 This is just a schematic diagram of the optical path of the WSS provided in the embodiment of the present application. In practical applications, in order to reduce the number of optical components in the WSS, Figure 2 The optical elements with different reference numerals can be the same optical element. For example, the second-stage switching engine 204 and the first-stage switching engine 202 are the same switching engine. For another example, the lens 213 and the lens 214 are the same lens. It should be understood that Figure 2 This is just a schematic diagram of the optical path of the WSS provided in the embodiment of the present application. In practical applications, those skilled in the art can make adaptive modifications to the optical path or structure of the WSS according to requirements, and the present application does not limit the specific structure of the WSS.

[0048] The structure of the ROADM 100 provided in the embodiment of the present application is described above by way of example. Figure 1 It can be seen that the ROADM 100 includes N1 first ports and N2 second ports. In practical applications, the first ports and the second ports can be connected to different devices. Figure 3 This is a second structural diagram of the ROADM provided in the embodiment of the present application. Figure 3 As shown, in Figure 1 On the basis of, a first port and a third port of ROADM 100 are connected to another ROADM 302. It should be understood that in practical applications, ROADM 100 can also include a coupler, and the coupler is used to connect the first port and the third port, so that bidirectional optical signals can be transmitted between ROADM 100 and another ROADM 302 through one optical fiber. It should be understood that Figure 3 In practical applications, the N1-1 first ports and the N1-1 third ports in the ROADM 100 can also be connected to N1-1 other ROADMs. The N1-1 first ports and the N1-1 third ports correspond one to one. The N1-1 first ports and the N1-1 other ROADMs correspond one to one. Figure 1 Based on the ROADM 100, a second port and a fourth port are connected to the communication device 301. It should be understood that Figure 3 A communication device is shown. In practical applications, the N2-1 second ports and the N2-1 fourth ports in the ROADM 100 can also connect to N2-1 communication devices. The N2-1 second ports and the N2-1 fourth ports correspond one to one. The N2-1 second ports and the N2-1 communication devices correspond one to one.

[0049] according to Figure 1 As can be seen from the description, ROADM 100 includes X first ports. X is an integer greater than or equal to N1. When X is greater than N1, the X first ports include N1 first ports and one or more first target input ports. Similarly, ROADM 100 includes X second ports. X is an integer greater than or equal to N1. When X is greater than N1, the X second ports include N1 second ports and one or more first target output ports. The first target input port and the first target output port can be used to connect communication equipment to achieve the addition and subtraction of branch optical signals. This is described below with examples.

[0050] Figure 4 The third structural diagram of the ROADM provided in the embodiment of the present application is shown in FIG. Figure 4 As shown, the ROADM 100 also includes a combiner 401. The combiner 401 is used to connect K communication devices (a communication device 402 is shown in the figure). K is an integer greater than or equal to 1. In the upstream direction, the K communication devices are used to output K upstream optical signals. The K upstream optical signals correspond to the K communication devices one by one. The combiner 401 is used to combine the K upstream optical signals to obtain a combined optical signal. The combiner 401 is connected to the first target input port of the ROADM 100 (In2 is used as the first target input port in the figure). The combiner 401 is used to transmit the combined optical signal to the first WSS 101. The first target output port of the first WSS 101 (OUT2 is used as the first target output port in the figure) is connected to the combiner 401. The first target output port is used to output the optical signal to be split. The combiner 401 is also used to split the optical signal to be split to obtain K downstream optical signals, and transmit the K downstream optical signals to the K communication devices. There is a one-to-one correspondence between the K downlink optical signals and the K communication devices.

[0051] exist Figure 1 In the example of , the N1 first optical signals include all wavelength signals in the N2 downstream wavelength signals, and the N1 third optical signals include all wavelength signals in the N1 first optical signals except the N2 downstream wavelength signals and the N2 upstream wavelength signals. Figure 4In the example, the N1 first optical signals include the N2 downstream wavelength signals and all wavelength signals in the K downstream optical signals. The N1 third optical signals include all wavelength signals in the N1 first optical signals except the downstream wavelength signals, the N2 upstream wavelength signals and all wavelength signals in the K upstream optical signals. The downstream wavelength signals include the N2 downstream wavelength signals and the K downstream optical signals. Figure 1 In the description of , the N2 downstream wavelength signals correspond to the N2 upstream wavelength signals one by one and have the same number of wavelengths. Figure 1 Similar to the description in Figure 4 In the example, the K downstream optical signals and the K upstream optical signals can also correspond one to one and have the same number of wavelengths.

[0052] In practical applications, the combiner 401 can be a WSS, an AWG, or a coupler. In order to reduce the cost of the combiner 401, when the K upstream optical signals and the K downstream optical signals are single-wavelength optical signals, the combiner 401 is an AWG or a coupler. When the K upstream optical signals or the K downstream optical signals include optical signals with multiple wavelengths, the combiner 401 is a WSS.

[0053] In actual applications, the first WSS 101 may fail, causing the ROADM 100 to fail to work properly. To this end, the embodiment of the present application can set a spare WSS for the first WSS 101. When the first WSS 101 fails, the first WSS 101 is replaced by the spare WSS. Figure 5 This is a fourth structural diagram of the ROADM provided in the embodiment of the present application. Figure 5 As shown, in Figure 1 , Figure 3 or Figure 4 On the basis of, the ROADM 100 further includes a second WSS 501 and a control component 502. The control component 502 includes an N1 group of couplers. Figure 5 Two sets of couplers are shown, one of which includes coupler 503 and coupler 504 , and the other includes coupler 505 and coupler 506 .

[0054] The second WSS 501 includes N second input ports and N second output ports. The N second input ports include X fifth ports (represented by In1, In2, ..., and InX, respectively). The X first ports include N1 fifth ports. The N1 fifth ports correspond to the N1 first ports one by one. Each group of corresponding fifth ports and first ports are connected to the same coupler or optical switch. For example, Figure 5In the example, In1 of the first WSS 101 and In1 of the second WSS 501 are connected to the coupler 503. In another example, InX of the first WSS 101 and InX of the second WSS 501 are connected to the coupler 505. The N second output ports include X seventh ports (represented by OUT1, OUT2, ..., and OUTX, respectively). The X seventh ports include N1 seventh ports. The N1 seventh ports correspond to the N1 third ports one by one, and each group of corresponding seventh ports and third ports is connected to the same coupler or optical switch. For example, in Figure 5 In the example of , OUT1 of the first WSS 101 and OUT1 of the second WSS 501 are connected to the coupler 504. In another example, OUTX of the first WSS 101 and OUTX of the second WSS 501 are connected to the coupler 505. Figure 5 In the example of , the N second input ports of the second WSS 501 also include N2 sixth ports (represented by A1, A2, ..., and AN2, respectively). The N2 sixth ports correspond to the N2 second ports one by one, and each group of corresponding sixth ports and second ports is connected to the same coupler or optical switch. Figure 5 In FIG. 5 , A1 of the first WSS 101 and A1 of the second WSS 501 are connected to the optical switch 507. The N second output ports of the second WSS 501 also include N2 eighth ports (represented by D1, D2, ..., and DN2, respectively). The N2 eighth ports correspond to the N2 fourth ports one by one, and each group of corresponding eighth ports and fourth ports is connected to the same coupler or optical switch. For example, in Figure 5 In FIG. 5 , D1 of the first WSS 101 and D1 of the second WSS 501 are connected to an optical switch 508 . The optical switch 508 and the optical switch 507 are connected to a communication device 509 .

[0055] In the embodiment of the present application, the function of the second WSS 501 is similar to that of the first WSS 101. Therefore, the description of the second WSS 501 can refer to the description of the first WSS 101. For example, the description of the X fifth ports can refer to the description of the X first ports of the first WSS 101. Each of the X fifth ports is configured with the ability to receive multi-wavelength optical signals. For another example, the description of the N1 fifth optical signal can refer to the description of the N1 first optical signals. Each of the N1 fifth optical signals includes at least one wavelength signal.

[0056] When the first WSS101 is in a normal state, the uplink optical signal of the communication device 509 reaches the first WSS101 after passing through the optical switch 507. The first WSS101 outputs the uplink optical signal of the communication device 509 through one of the third ports of N1. For example, the first WSS101 outputs the uplink optical signal of the communication device 509 through OUT1. The uplink optical signal reaches another ROADM after passing through the coupler 504. The downlink optical signal of the communication device 509 reaches the first WSS101 and the second WSS501 after passing through the coupler 503. The first WSS101 and the second WSS501 output the downlink optical signal of the communication device 509 through the fourth port. For example, the first WSS101 and the second WSS501 output the downlink optical signal of the communication device 509 through D1 respectively. The optical switch 508 blocks the downlink optical signal from the second WSS 501 and transmits the downlink optical signal from the first WSS101 to the communication device 509.

[0057] When the first WSS101 is in a faulty state, the uplink optical signal of the communication device 509 reaches the second WSS 501 after passing through the optical switch 507. The second WSS 501 outputs the uplink optical signal of the communication device 509 through one of the third ports of N1. For example, the second WSS 501 outputs the uplink optical signal of the communication device 509 through OUT1. The uplink optical signal reaches another ROADM after passing through the coupler 504. The downlink optical signal of the communication device 509 reaches the first WSS101 and the second WSS 501 after passing through the coupler 503. The first WSS101 and the second WSS 501 output the downlink optical signal of the communication device 509 through the fourth port. For example, the first WSS101 and the second WSS 501 output the downlink optical signal of the communication device 509 through D1 respectively. The optical switch 608 blocks the downlink optical signal from the first WSS101 and transmits the downlink optical signal from the second WSS 501 to the communication device 509.

[0058] It should be understood that Figure 5 In the embodiment, the coupler 503 can be replaced by an optical switch, and the optical switch 508 can be replaced by a coupler. When the first WSS 101 is in a normal state, the optical switch can selectively transmit the downlink optical signal of the communication device 509 to the first WSS 101. When the first WSS 101 is in a fault state, the optical switch can selectively transmit the downlink optical signal of the communication device 509 to the second WSS 501. Similarly, the optical switch 507 can be replaced by a coupler, and the coupler 504 can be replaced by an optical switch.

[0059] exist Figure 5In the example, the first WSS 101 and the second WSS 501 are connected to the same communication device through the second port and the fourth port. In actual applications, the first WSS 101 and the second WSS 501 can also be connected through Figure 4 The communication device is connected through the first target input port and the first target output port in the manner described in the embodiment of the present invention. Figure 6 This is a fifth structural diagram of the ROADM provided in the embodiment of the present application. Figure 6 As shown, in Figure 5 On the basis of, ROADM 100 further includes optical switch 601 and optical switch 602. The first WSS 101 and the second WSS 501 both include a first target input port and a first target output port. Figure 6 In the example of , the first target input port of the first WSS 101 and the second WSS 501 is In2. The first target output port of the first WSS 101 and the second WSS 501 is OUT2. The first target input ports of the first WSS 101 and the second WSS 501 are connected to the optical switch 601. The first target output ports of the first WSS 101 and the second WSS 501 are connected to the optical switch 602. The optical switch 601 and the optical switch 602 are connected to the combiner 401. The combiner 401 is connected to K communication devices. Figure 6 The communication device 402 is taken as an example.

[0060] When the first WSS101 is in a normal state, the uplink optical signal of the communication device 402 reaches the first WSS101 after passing through the optical switch 601. The first WSS101 outputs the uplink optical signal of the communication device 402 through one of the third ports of N1. For example, the first WSS101 outputs the uplink optical signal of the communication device 402 through OUT1. The uplink optical signal reaches another ROADM after passing through the coupler 504. The downlink optical signal of the communication device 402 reaches the first WSS101 and the second WSS501 after passing through the coupler 503. The first WSS101 and the second WSS 501 output the downlink optical signal of the communication device 402 through the first target output port. Figure 6 In the example of FIG. 4 , the first WSS 101 and the second WSS 501 respectively output the downstream optical signal of the communication device 402 through OUT2 . The optical switch 602 blocks the downstream optical signal from the second WSS 501 and transmits the downstream optical signal from the first WSS 101 to the communication device 402 .

[0061] When the first WSS 101 is in a faulty state, the uplink optical signal of the communication device 402 reaches the second WSS 501 after passing through the optical switch 601. The second WSS 501 outputs the uplink optical signal of the communication device 402 through one of the third ports of N1. For example, the second WSS 501 outputs the uplink optical signal of the communication device 402 through OUT1. The uplink optical signal reaches another ROADM after passing through the coupler 504. The downlink optical signal of the communication device 402 reaches the first WSS 101 and the second WSS 501 after passing through the coupler 503. The first WSS 101 and the second WSS 501 output the downlink optical signal of the communication device 402 through the first target output port. Figure 6 In the example of FIG. 5 , the first WSS 101 and the second WSS 501 respectively output the downlink optical signal of the communication device 402 through OUT2. The optical switch 602 blocks the downlink optical signal from the first WSS 101 and transmits the downlink optical signal from the second WSS 501 to the communication device 402. Figure 5 Similar to the description, Figure 6 The optical switch in can be replaced by a coupler, and the coupler can be replaced by an optical switch.

[0062] According to the aforementioned Figure 1 As can be seen from the description, the first WSS 101 includes N1 line-dimensional ports. In practical applications, a single WSS may include fewer line-dimensional ports. By cascading multiple WSSs, the number of line-dimensional ports included in the ROADM 100 can be increased.

[0063] Figure 7 This is a sixth structural diagram of the ROADM provided in the embodiment of the present application. Figure 7 As shown, in Figure 1 , Figure 3 or Figure 4 On the basis of, ROADM 100 includes a second WSS 701. The second WSS 701 includes X second input ports and M2 second output ports. The X second input ports include X fifth ports (represented by In1, In2, ..., and InX, respectively) and M2 sixth ports (represented by A1, A2, ..., and AM2, respectively). The M2 second output ports include X seventh ports (represented by OUT1, OUT2, ..., and OUTX, respectively) and M2 eighth ports (represented by D1, D2, ..., and DM2, respectively). In actual applications, the value of M2 can be the same as or different from the value of N2.

[0064] The first WSS 101 also includes a second target input port (indicated by In) and a second target output port (indicated by OUT). The second WSS 701 also includes a third target input port (indicated by In) and a third target output port (indicated by OUT). The third target output port is connected to the second target input port. The second target output port is connected to the third target input port. The X fifth ports include M1 fifth ports. X is an integer greater than or equal to M1. The value of M1 can be the same as or different from the value of N1. The M1 fifth ports are used to receive M1 fifth optical signals. The M1 fifth ports correspond one-to-one to the M1 fifth optical signals. The M1 seventh ports are used to output M1 seventh optical signals. The M1 seventh ports correspond one-to-one to the M1 seventh optical signals. The M2 sixth ports can be used to receive M2 single-wavelength sixth optical signals. M2 single-wavelength sixth optical signals M2 sixth optical signals or M2 uplink wavelength signals. The M2 single-wavelength sixth optical signals correspond one-to-one to the M2 sixth ports. The M2 eighth ports can be used to output M2 single-wavelength eighth optical signals. The M2 single-wavelength eighth optical signals correspond to the M2 eighth ports in one-to-one correspondence. The M2 single-wavelength eighth optical signals are M2 eighth optical signals or M2 downstream wavelength signals.

[0065] In the embodiment of the present application, the function of the second WSS 701 is similar to that of the first WSS 101. Therefore, the description of the second WSS 701 can refer to the description of the first WSS 101. For example, the description of the X fifth ports can refer to the description of the X first ports of the first WSS 101. Each of the X fifth ports is configured with the ability to receive multi-wavelength optical signals. For another example, the description of the M1 fifth optical signal can refer to the description of the N1 first optical signals. Each first optical signal in the M1 fifth optical signal includes at least one wavelength signal.

[0066] exist Figure 7 In the example of , when the M2 sixth ports of the second WSS 701 do not receive the sixth optical signal and the M2 eighth ports do not output the eighth optical signal, the eastbound optical signal includes all wavelength signals in the N2 downstream wavelength signals. The eastbound optical signal includes N1 first optical signals and M1 fifth optical signal. For example, the N1 first optical signals include all wavelength signals in the N2 downstream wavelength signals, and the M1 fifth optical signal does not include wavelength signals in the N2 downstream wavelength signals. For another example, the M1 fifth optical signal includes all wavelength signals in the N2 downstream wavelength signals, and the N1 first optical signals do not include wavelength signals in the N2 downstream wavelength signals. For another example, the M1 fifth optical signal includes a portion of wavelength signals in the N2 downstream wavelength signals, and the N1 first optical signals include another portion of wavelength signals in the N2 downstream wavelength signals.

[0067] Similarly, in Figure 7In the example, when the M2 sixth ports of the second WSS 701 do not receive the sixth optical signal and the M2 eighth ports do not output the eighth optical signal, the westbound optical signal includes all wavelength signals in the eastbound optical signal except the N2 downstream wavelength signals and the N2 upstream wavelength signals. The westbound optical signal includes the N1 third optical signals and the M1 seventh optical signal. Therefore, the N1 third optical signals and the M1 seventh optical signal include the N2 upstream wavelength signals. For example, the N1 third optical signals include all wavelength signals in the N2 upstream wavelength signals, and the M1 seventh optical signal does not include wavelength signals in the N2 downstream wavelength signals. For another example, the M1 seventh optical signal includes all wavelength signals in the N2 upstream wavelength signals, and the N1 third optical signals do not include wavelength signals in the N2 downstream wavelength signals. For another example, the M1 seventh optical signal includes a portion of wavelength signals in the N2 upstream wavelength signals, and the N1 third optical signals include another portion of wavelength signals in the N2 downstream wavelength signals.

[0068] exist Figure 7 In the example, when the M2 sixth ports of the second WSS 701 receive the sixth optical signal and the M2 eighth ports output the eighth optical signal, the eastbound optical signal includes the N2 downstream wavelength signals and all wavelength signals in the M2 downstream wavelength signals. Regarding the distribution of the N2 downstream wavelength signals in the eastbound optical signal, please refer to the description when the M2 sixth ports of the second WSS 701 do not receive the sixth optical signal and the M2 eighth ports do not output the eighth optical signal. The distribution of the M2 downstream wavelength signals in the eastbound optical signal can also refer to the distribution of the N2 downstream wavelength signals in the eastbound optical signal. For example, the N1 first optical signals include all wavelength signals in the M2 downstream wavelength signals, and the M1 fifth optical signal does not include a wavelength signal in the M2 downstream wavelength signals.

[0069] Similarly, in Figure 7 In the example, when the M2 sixth ports of the second WSS 701 receive the sixth optical signal and the M2 eighth ports output the eighth optical signal, the westbound optical signal includes all wavelength signals and M2+M1 single-wavelength optical signals in the eastbound optical signal except the N2 downstream wavelength signals and the M2 downstream wavelength signals. The M2+M1 single-wavelength optical signals include N2 upstream wavelength signals and M2 upstream wavelength signals. Regarding the distribution of the N2 upstream wavelength signals in the westbound optical signal, please refer to the description when the M2 sixth ports of the second WSS 701 do not receive the sixth optical signal and the M2 eighth ports do not output the eighth optical signal. The distribution of the M2 upstream wavelength signals in the westbound optical signal can also refer to the distribution of the N2 upstream wavelength signals in the westbound optical signal. For example, the N1 third optical signals include all wavelength signals in the M2 upstream wavelength signals, and the M1 seventh optical signal does not include a wavelength signal in the M2 upstream wavelength signals.

[0070] exist Figure 7 In the example of , by cascading two WSSs, the number of optical signals that the ROADM can schedule can be increased, thereby improving the performance of the ROADM. Figure 7 In the example of , the first WSS 101 includes N1 first ports and N1 third ports. Therefore, the first WSS 101 can connect to ROADMs of N1 dimensions at most. After the second WSS 701 and the first WSS 101 are cascaded, the ROADM 100 can connect to ROADMs of M1+M2 dimensions.

[0071] In practical applications, the ability of ROADM to receive optical signals can be improved by cascading two WSSs. Figure 7 In the embodiment, the first WSS 101 includes N2 second ports and N2 fourth ports. Therefore, the ROADM 100 can connect to N2 communication devices at most through the N2 second ports and N2 fourth ports. After the second WSS 701 and the first WSS 101 are cascaded, the ROADM 100 can connect to N2 communication devices at most through the N2 second ports and N2 fourth ports, and the ROADM 100 can also connect to M2 communication devices at most through the M2 sixth ports and M2 eighth ports. Therefore, the ability of the ROADM to receive the upper wave optical signal can be improved by cascading two WSSs.

[0072] According to the aforementioned Figure 4 As can be seen from the description, the first WSS101 can be connected to the combiner through the first target input port and the first target output port, thereby increasing the number of optical signals added and dropped by the first WSS101. Figure 7 Any one or more WSSs in can also include a first target input port and a first target output port. Figure 7 In the embodiment, the first WSS101 includes a first target input port and a first target output port, and the first WSS101 is connected to the first combiner through the first target input port and the first target output port; the second WSS 701 also includes a first target input port and a first target output port, and the second WSS 701 is connected to the second combiner through the first target input port and the first target output port.

[0073] exist Figure 7 In the embodiment, the performance of the ROADM can be improved by cascading the first WSS 101 and the second WSS 701. In practical applications, the performance of the ROADM can also be improved by connecting two WSSs in parallel. Figure 8 This is the seventh structural diagram of the ROADM provided in the embodiment of the present application. Figure 8 As shown, in Figure 1 , Figure 3 or Figure 4On the basis of, the ROADM 100 further includes a second WSS 811 and a control component 801. The control component 801 includes an N1 group of couplers. Figure 8 Two sets of couplers are shown, one of which includes coupler 802 and coupler 803 , and the other includes coupler 804 and coupler 805 .

[0074] The second WSS 801 includes N second input ports and N second output ports. The N second input ports include X fifth ports (represented by In1, In2, ..., and InX, respectively) and M2 sixth ports (represented by A1, A2, ..., and AM2, respectively). The N second output ports include X seventh ports (represented by OUT1, OUT2, ..., and OUTX, respectively) and M2 eighth ports (represented by D1, D2, ..., and DM2, respectively). The M2 sixth ports are used to receive M2 single-wavelength sixth optical signals. The M2 sixth ports correspond one-to-one to the M2 single-wavelength sixth optical signals. The M2 single-wavelength sixth optical signals are also called M2 upstream wavelength signals or M2 sixth optical signals. The M2 eighth ports are used to output M2 single-wavelength eighth optical signals. The M2 eighth ports correspond one-to-one to the M2 single-wavelength eighth optical signals. The M2 single-wavelength eighth optical signals are also called M2 downstream wavelength signals or M2 eighth optical signals. In practical applications, the value of M2 can be the same as or different from the value of N2.

[0075] The X fifth ports include N1 fifth ports. The N1 fifth ports correspond to the N1 first ports one by one. The corresponding fifth ports and first ports are connected to the same coupler. For example, Figure 8 , In1 of the first WSS 101 corresponds to In1 of the second WSS 701. In1 of the first WSS 101 and In1 of the second WSS 811 are connected to the coupler 802. For another example, InX of the first WSS 101 corresponds to InX of the second WSS 811. InX of the first WSS 101 and InX of the second WSS 811 are connected to the coupler 804. N1 fifth ports are used to receive N1 first optical signals through the coupler. N1 fifth ports correspond to N1 first optical signals one by one.

[0076] The X seventh ports include N1 seventh ports. The N1 seventh ports correspond to the N1 third ports one by one. The corresponding seventh ports and third ports are connected to the same coupler. For example, Figure 8, OUT1 of the first WSS 101 corresponds to OUT of the second WSS 811. OUT of the first WSS 101 and OUT of the second WSS 811 are connected to the coupler 803. For another example, OUTX of the first WSS 101 corresponds to OUTX of the second WSS 811. OUTX of the first WSS 101 and OUTX of the second WSS 811 are connected to the coupler 805. The N1 seventh ports are used to output N1 seventh optical signals through the coupler. The N1 seventh optical signals correspond one to one with the N1 seventh ports.

[0077] In the embodiment of the present application, the function of the second WSS 811 is similar to that of the first WSS 101. Therefore, the description of the second WSS 811 can refer to the description of the first WSS 101. For example, the description of the X fifth ports can refer to the description of the X first ports of the first WSS 101. Each of the X fifth ports is configured with the ability to receive multi-wavelength optical signals. For another example, the description of the N1 fifth optical signal can refer to the description of the N1 first optical signals. Each of the N1 fifth optical signals includes at least one wavelength signal.

[0078] exist Figure 8 In the example, N1 fifth optical signals include all wavelength signals in M2 downstream wavelength signals. N1 seventh optical signals include all wavelength signals in N1 fifth optical signals except M2 downstream wavelength signals and M2 upstream wavelength signals. Control component 801 includes N1 groups of couplers. N1 groups of couplers correspond one to one to N1 first ports. A group of couplers includes a west coupler (e.g., coupler 803) and an east coupler (e.g., coupler 802). The west coupler is used to receive a third optical signal from the first WSS 101 and a fifth optical signal from the second WSS 811. The west coupler is used to combine the first optical signal and the fifth optical signal, and transmit the combined optical signal to another ROADM. The east coupler is used to receive an optical signal to be split from another ROADM, split the optical signal to be split, and obtain a first optical signal and a fifth optical signal. The east coupler is used to transmit the fifth optical signal to the second WSS 811 and the first optical signal to the first WSS 101.

[0079] exist Figure 8, A1 and D1 of the first WSS 101 are connected to the communication device 821. A1 and D1 of the second WSS 811 are connected to the communication device 822. Before the first WSS 101 and the second WSS 811 are connected in parallel, the ROADM 100 is connected to a maximum of N2 communication devices through the N2 second ports and the N2 fourth ports of the first WSS 101. After the first WSS 101 and the second WSS 811 are connected in parallel, the ROADM 100 can also be connected to a maximum of M2 communication devices through the M2 sixth ports and the M2 eighth ports. Therefore, the embodiment of the present application can improve the performance of the ROADM.

[0080] Fig. 9 This is a schematic diagram of the structure of the optical switching system provided in this application. Fig. 9 As shown, the optical switching system 1600 includes a plurality of ROADMs. Fig. 9 As shown, the optical switching system 1600 shown in this embodiment includes ROADM 1601, ROADM 1602, ROADM 1603, ROADM 1604 and ROADM 1605. It should be clear that the description of the number of ROADMs included in the optical switching system 1600 in this embodiment is an optional example and is not limited. The optical switching system 1600 also includes an optical fiber connected between two ROADMs. Taking ROADM 1601 and ROADM 1605 as an example, the optical switching system 1600 also includes an optical fiber 1606 connected between ROADM 1601 and ROADM 1605. This embodiment does not limit the connection relationship between the multiple ROADMs included in the optical switching system 1600.

[0081] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A reconfigurable optical add / drop multiplexer (ROADM), characterized in that: The invention comprises a first wavelength selective switch WSS, wherein the first WSS comprises N first input ports and N first output ports, wherein: The N first input ports include N1 first ports and N2 second ports, N1 is an integer greater than 1, N2 is an integer greater than 0, the N1 first ports are used to receive N1 first optical signals, each first optical signal includes at least one first wavelength signal, the N1 first optical signals correspond to the N1 first ports in a one-to-one manner, the N2 second ports are used to receive N2 single-wavelength second optical signals, and the N2 single-wavelength second optical signals correspond to the N2 second ports in a one-to-one manner; The N first output ports include N1 third ports and N2 fourth ports, the N1 third ports are used to output N1 third optical signals, each third optical signal includes at least one third wavelength signal, the N1 third optical signals correspond to the N1 third ports one-to-one, the N2 fourth ports are used to output N2 single-wavelength fourth optical signals, the N2 single-wavelength fourth optical signals correspond to the N2 fourth ports one-to-one, the N2 fourth optical signals are obtained based on the N1 first optical signals, the N1 third optical signals are obtained based on the N2 single-wavelength second optical signals, the N1 first ports and the N1 third ports are ports of line dimension, and the N2 second ports and the N2 fourth ports are ports of branch dimension.

2. The ROADM according to claim 1, characterized in that: The ROADM further includes a combiner, the N first input ports further include a first target input port, and the N first output ports further include a first target output port; The combiner is used to receive K uplink optical signals, and combine the K uplink optical signals to obtain a combined optical signal, where K is an integer greater than 0, and the first target input port is used to receive the combined optical signal, and the N1 third optical signals include part or all of the wavelength signals in the K uplink optical signals; The first target output port is used to output the optical signal to be split, and the combiner is also used to split the optical signal to be split to obtain K downstream optical signals, and output the K downstream optical signals, and the N1 first optical signals include part or all of the wavelength signals in the K downstream optical signals.

3. The ROADM according to claim 2, characterized in that: The combiner is an arrayed waveguide grating AWG or a coupler, and the K uplink optical signals and the K downlink optical signals are optical signals of a single wavelength.

4. The ROADM according to claim 2, characterized in that: The combiner is a WSS, and the K uplink optical signals include optical signals with multiple wavelengths.

5. The ROADM according to any one of claims 1 to 4, characterized in that: The ROADM further includes a second WSS, wherein the second WSS includes N1 fifth ports and N1 seventh ports, wherein: The N1 fifth ports correspond to the N1 first ports one by one, and each group of corresponding fifth ports and first ports are connected to the same coupler or optical switch; The N1 seventh ports correspond to the N1 third ports one by one, and each group of corresponding seventh ports and third ports is connected to the same coupler or optical switch.

6. The ROADM according to claim 5, characterized in that: The second WSS further includes N2 sixth ports, the N2 sixth ports correspond to the N2 second ports one by one, and each group of corresponding sixth ports and second ports is connected to the same coupler or optical switch; The second WSS further includes N2 eighth ports, the N2 eighth ports correspond to the N2 fourth ports one by one, and each group of corresponding eighth ports and fourth ports is connected to the same coupler or optical switch.

7. The ROADM according to any one of claims 1 to 4, characterized in that: The ROADM further includes a second WSS, the second WSS includes M1 fifth ports, a third target input port, M1 seventh ports and a third target output port, the N first input ports further include a second target input port, the N first output ports further include a second target output port, the third target output port is connected to the second target input port, and the second target output port is connected to the third target input port, wherein: The M1 fifth ports are used to receive M1 fifth optical signals, the M1 seventh ports are used to output M1 seventh optical signals, the N2 single-wavelength fourth optical signals are N2 wavelength signals in the east-bound optical signal, the east-bound optical signal includes the N1 first optical signals and the M1 fifth optical signals, and the M1 seventh optical signals are obtained based on the N2 single-wavelength second optical signals.

8. The ROADM according to claim 7, characterized in that: The second WSS further includes M2 sixth ports and M2 eighth ports, wherein: The M2 sixth ports are used to receive M2 single-wavelength sixth optical signals, the M2 eighth ports are used to output M2 single-wavelength eighth optical signals, the M2 single-wavelength eighth optical signals are M2 wavelength signals in the eastbound optical signal, the westbound optical signal includes the M1 seventh optical signals and the N1 third optical signals, the M2+M1 single-wavelength optical signals include the N2 single-wavelength second optical signals and the M2 single-wavelength sixth optical signal, and the westbound optical signal includes all wavelength signals in the M2+M1 single-wavelength optical signals.

9. The ROADM according to any one of claims 1 to 4, characterized in that: The ROADM further includes a second WSS, wherein the second WSS includes N1 fifth ports and N1 seventh ports, wherein: The N1 fifth ports are used to receive the N1 first optical signals, the N1 fifth ports correspond to the N1 first ports one by one, and the corresponding fifth ports and first ports are connected to the same coupler; The N1 seventh ports are used to output N1 seventh optical signals, the N1 seventh ports correspond to the N1 third ports one by one, and the corresponding seventh ports and third ports are connected to the same coupler; The second WSS also includes M2 sixth ports and M2 eighth ports, the M2 sixth ports are used to receive M2 single-wavelength sixth optical signals, the M2 eighth ports are used to output M2 single-wavelength eighth optical signals, the N1 seventh optical signals include all wavelength signals in the M2 single-wavelength sixth optical signals, and the M2 single-wavelength eighth optical signals are M2 wavelength signals in the N1 first optical signals.

10. An optical switching system, characterized in that: The method comprises the ROADM according to any one of claims 1 to 9 and another ROADM, wherein the ROADM is configured to transmit one third optical signal among N1 third optical signals to the another ROADM.

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