Optical packet switch and optical packet switching method

Abstract

The present invention relates to an optical packet switch and an optical packet switching method. The optical packet switch comprises a service aggregator, a wavelength converter, and a switching module. The output of the service aggregator is connected to the input of the wavelength converter, which in turn is connected to the input of the switching module. The service aggregator is configured to aggregate service information belonging to the same wavelength link from different input optical fibers into a single transmission link. The wavelength converter is configured to perform wavelength conversion on the service information aggregated into the single transmission link to obtain service information of different wavelengths. The switching module is configured to perform service information exchange processing on the service information of different wavelengths. This invention can reduce the structural complexity of the optical packet switch and reduce the physical size of the optical packet switch.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to an optical packet switch and an optical packet switching method. Background Art

[0002] Optical Packet Switching (OPS) refers to the use of packet switching in optical communications. During OPS, the wavelength of each input fiber is converted by a wavelength converter and then directly connected to the input port of a switching module. The number of wavelength converters matches the number of ports on the switching module. The number of input ports on a switching module is equal to the product of the number of fibers and the number of wavelengths accommodated by a single fiber. The number of output ports on the switching module is also equal to this product. Assuming the number of fibers is F and the number of wavelengths per fiber is W, the switching module requires a FW*FW switching matrix. That is, the number of input and output ports on the switching module is FW, and the number of wavelength converters is also FW. As the number of fibers increases, the number of ports and wavelength converters on the switching module increases accordingly, leading to increased structural complexity and larger physical size. Summary of the Invention

[0003] The present invention provides an optical packet switch and an optical packet switching method, which can reduce the structural complexity of the optical packet switch and reduce the physical size of the optical packet switch.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention provides an optical packet switch, comprising:

[0006] Service aggregators, wavelength converters and switching modules;

[0007] The output end of the service aggregator is connected to the input end of the wavelength converter, and the output end of the wavelength converter is connected to the input end of the switching module;

[0008] The service aggregator is used to aggregate service information of different input optical fibers belonging to the same wavelength link into the same transmission link;

[0009] The wavelength converter is used to convert the wavelength of the service information converged on the same transmission link to obtain service information of different wavelengths;

[0010] The switching module is used to perform service information switching processing on the service information of different wavelengths.

[0011] Optionally, the service aggregator includes:

[0012] Optical switches and optical buffers;

[0013] The output end of the optical switch is connected to the input end of the optical buffer, and the output end of the optical buffer is connected to the input end of the wavelength converter;

[0014] The optical switch is used to input the service information of the different input optical fibers belonging to the same wavelength link into different input ports of the optical buffer;

[0015] The optical buffer is used to perform buffering processing on the input service information, and aggregate the service information of the different input optical fibers belonging to the same wavelength link into the same transmission link.

[0016] Optionally, the optical buffer includes:

[0017] a plurality of first optical couplers;

[0018] Multiple first optical couplers are connected in sequence, the input port of the first optical coupler is connected to the output port of the optical switch, the output port of the first optical coupler at the tail end is connected to the input port of the previous first optical coupler, and the output port of the first optical coupler at the head end is connected to the wavelength converter.

[0019] Optional,

[0020] According to the arrangement order from the first optical coupler at the tail end to the first optical coupler at the head end, the coupling coefficient of the i-th first optical coupler is 1 / (i+1);

[0021] Wherein, 1≤i≤N-1, and N is the number of input ports of the optical buffer.

[0022] Optionally, the optical buffer further includes:

[0023] Fiber optic delay lines;

[0024] Two adjacent first optical couplers are connected via the optical fiber delay line.

[0025] Optionally, the switching module includes:

[0026] a first optical demultiplexer, a switching unit, and an optical multiplexer;

[0027] The input end of the first optical demultiplexer is connected to the output end of the wavelength converter, the output end of the first optical demultiplexer is connected to the input end of the switching unit, and the output end of the switching unit is connected to the input end of the optical multiplexer.

[0028] Optionally, the switching unit includes:

[0029] an optical beam splitter and a second optical coupler;

[0030] The input end of the optical beam splitter is connected to the output end of the first optical demultiplexer, the output end of the optical beam splitter is connected to the input end of the second optical coupler, and the output end of the second optical coupler is connected to the input end of the optical multiplexer.

[0031] Optionally, also include:

[0032] a second optical demultiplexer;

[0033] The input end of the second optical demultiplexer is connected to the input optical fiber, and the output end of the second optical demultiplexer is connected to the input end of the service aggregator.

[0034] The present invention also provides an optical packet switching method, which is applied to an optical packet switch. The optical packet switch includes a service aggregator, a wavelength converter, and a switching module. The method includes:

[0035] The service aggregator aggregates service information belonging to the same wavelength link from different input optical fibers into the same transmission link;

[0036] The wavelength converter performs wavelength conversion on the service information converged on the same transmission link to obtain service information of different wavelengths;

[0037] The switching module performs service information switching processing on the service information of different wavelengths.

[0038] Optionally, the service aggregator aggregates service information of different input optical fibers belonging to the same wavelength link into the same transmission link, including:

[0039] When the cache state of the optical buffer of the service aggregator is that there is a cache area, the optical switch of the service aggregator inputs the service information of different input optical fibers belonging to the same wavelength link to the input port with the shortest delay in the optical buffer;

[0040] The optical buffer performs buffering processing on the input service information, and aggregates the service information of the different input optical fibers belonging to the same wavelength link into the same transmission link.

[0041] As can be seen from the above technical solutions, the present invention discloses an optical packet switch and optical packet switching method. A service aggregator can aggregate service information belonging to the same wavelength link from different input optical fibers onto a single transmission link. The number of wavelength converters is independent of the number of input optical fibers, but only dependent on the number of wavelengths, thus reducing the number of wavelength converters. Furthermore, the wavelength converters can wavelength-convert the service information aggregated onto the same transmission link to obtain service information of different wavelengths, thereby maintaining the consistency between the number of ports and the number of wavelengths in the switching module and further reducing the number of switch module ports. This invention is unaffected by the number of optical fibers and can reduce the structural complexity and physical size of the optical packet switch.

[0042] Of course, it is not necessary to achieve all of the advantages described above simultaneously in order to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 A schematic diagram of the structure of an optical packet switch provided in an embodiment of the present invention;

[0045] Figure 2 A schematic diagram of the structure of a service aggregator provided in an embodiment of the present invention;

[0046] Figure 3 A schematic diagram of the service aggregator processing process provided by an embodiment of the present invention;

[0047] Figure 4 A structural diagram of an optical packet switch provided in an embodiment of the present invention;

[0048] Figure 5 This is a flow chart of the optical packet switching method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] The present invention provides an optical packet switch, such as Figure 1As shown, the packet switch includes: a service aggregator 1, a wavelength converter 2 and a switching module 3. The output end of the service aggregator 1 is connected to the input end of the wavelength converter 2, and the output end of the wavelength converter 2 is connected to the input end of the switching module 3.

[0051] The service aggregator 1 is used to aggregate service information of different input optical fibers belonging to the same wavelength link into the same transmission link.

[0052] The wavelength converter 2 is used to perform wavelength conversion on the service information converged on the same transmission link to obtain service information of different wavelengths.

[0053] The switching module 3 is used to perform service information switching processing on service information of different wavelengths.

[0054] In the optical packet switch of the present invention, service information from different input optical fibers belonging to the same wavelength link is aggregated onto the same transmission link through an input service aggregator. The service aggregator is connected to a wavelength converter, and the number of the wavelength converters is equal to the number of wavelengths accommodated by a single optical fiber, that is, the number of the wavelength converters is independent of the number of input optical fibers. Compared with an optical packet switch without a service aggregator, the number of its wavelength converters is the product of the number of optical fibers and the number of wavelengths of a single optical fiber. The number of wavelength converters required for the optical packet switch of the present invention is significantly reduced. As the number of optical fibers increases, the number of wavelength converters required in the optical packet switch of the present invention decreases exponentially. Optionally, the wavelength converter can be a full wavelength converter, that is, a tunable wavelength converter (TWC), which can be implemented using a cross-gain modulated semiconductor optical amplifier and a cross-phase modulated semiconductor optical amplifier. The output port of the service aggregator is connected to the full wavelength converter TWC, which converts the input wavelength carrying the service into any desired wavelength, that is, the number of wavelengths carried by a single optical fiber is W, and any input wavelength λ i (W≥i≥1) is transformed into λ1, λ2, ..., λ after TWC W There are W wavelengths in total.

[0055] The number of wavelength converters is consistent with the number of ports of the switching module. The number of wavelength converters is equal to the number of wavelengths accommodated by a single optical fiber. The number of ports of the switching module is also the same as the number of wavelengths, that is, the number of ports of the switching module is independent of the number of input optical fibers. Therefore, compared with an optical packet switch without a service aggregator, the number of ports of the switching module is the product of the number of optical fibers and the number of wavelengths of a single optical fiber. The number of ports of the switching module required by the optical packet switch of the present invention is greatly reduced.

[0056] Since the number of wavelength converters and the number of ports of the switching module in the optical packet switch of the present invention are greatly reduced compared to an optical packet switch without a service aggregator, the structural complexity of the optical packet switch can be reduced, the structure of the optical packet switch can be simplified, the physical size of the optical packet switch can be reduced, and economic costs can be saved.

[0057] In addition, the present invention is directed to a hybrid optical switching network, which combines optical circuit switching (OCS), optical packet switching (OPS), optical burst switching (OBS) and electrical packet switching (EPS) technologies. The optical packet switch mainly exchanges and transmits sparse services in network scenarios. By configuring a service aggregator in the optical packet switch, the sparse services are aggregated, and the service information on multiple different links is aggregated to fewer network links for transmission, thereby maximizing the utilization of network resources while meeting the diversified service needs.

[0058] As an optional implementation, Figure 2 As shown, the service aggregator includes an optical switch 21 and an optical buffer 22. The output end of the optical switch 21 is connected to the input end of the optical buffer 22, and the output end of the optical buffer 22 is connected to the input end of the wavelength converter.

[0059] The optical switch is used to input the service information of different input optical fibers belonging to the same wavelength link into different input ports of the optical buffer.

[0060] The optical switch can be a multi-input multi-output optical switch, i.e., it has multiple input ports and multiple output ports. The number of input ports can be the same as the number of output ports, and the number of input ports and output ports can be the same as the number of input optical fibers. The optical switch can be a spatial optical switch, which can be a low-speed spatial optical switch. The low-speed spatial optical switch can be implemented using a MEMS optical switch.

[0061] The optical buffer is used to cache the input service information and aggregate the service information of different input optical fibers belonging to the same wavelength link into the same transmission link.

[0062] Optional, such as Figure 2As shown, the optical buffer 22 includes: a plurality of first optical couplers 221. The plurality of first optical couplers are connected in sequence, with the input port of the first optical coupler connected to the output port of the optical switch, the output port of the first optical coupler at the tail end connected to the input port of the previous first optical coupler, and the output port of the first optical coupler at the head end connected to the wavelength converter.

[0063] The first optical coupler has two input ports and one output port, and the two input ports are respectively connected to the output port of the off switch and the output port of the next first optical coupler.

[0064] Optional, such as Figure 2 As shown, the optical buffer 22 further includes an optical fiber delay line 222. Two adjacent first optical couplers 221 are connected via the optical fiber delay line 222. The number of the first optical couplers can be the same as the number of the optical fiber delay lines.

[0065] The fiber delay line (FDL) can be a fixed-length fiber delay line, used to provide a corresponding delay for transmission services input into the optical buffer. The length of the FDL is fixed to the average packet length of the services processed by the network. Accordingly, the delay provided by each FDL is equal to the transmission time of the average-length packet.

[0066] The optical buffer can be a multi-input, single-output optical buffer, meaning it has multiple input ports and one output port. The number of input ports can be the same as the number of output ports of the optical switch, meaning the number of input ports can be the same as the number of input optical fibers. This multi-input, single-output optical buffer acts as an optical queue memory with multiple input ports and a single output port. The optical switch checks the current buffer queue status for incoming data packets and locates the appropriate queue insertion position for the incoming service information, specifically determining the input port of the optical buffer that corresponds to the output port of the optical switch.

[0067] The optical switch can input service information of different input optical fibers belonging to the same wavelength link to different input ports of the optical buffer according to the buffer status of the optical buffer.

[0068] The buffering state of the optical buffer may include the presence of an available buffer area and the absence of an available buffer area. The presence of an available buffer area means that the optical buffer has an available input port. In this buffering state, the current buffering state of the optical buffer may be empty. The absence of an available buffer area means that the optical buffer has no available input port.

[0069] If the optical buffer has no available input port, the current service information will be discarded.

[0070] If the current buffer state of the optical buffer is empty, that is, there is no service queued at present, the arriving new service information is directly output to the output port of the optical buffer.

[0071] If the optical buffer has an available input port, the current service information will be allocated to the optical buffer input port with the shortest delay for buffering and transmission.

[0072] When allocating current service information to the input port of the optical buffer with the shortest latency, care must be taken to avoid conflicts with service information currently being transmitted in the optical buffer. Specifically, if the service aggregator's optical buffer has a buffer area, the service aggregator's optical switch will input service information from different input fibers belonging to the same wavelength link to the input port with the shortest latency in the optical buffer, and no service information will be transmitted from any subsequent input ports.

[0073] like Figure 3 As shown, assume that the service information currently arriving at the optical packet switch is 31, the optical buffer has a total of K optical fiber delay lines 222, and the optical buffer has K+1 input ports, that is, the optical buffer has K+1 insertion positions, which are represented by dashed arrows (along the time direction, the input ports of the optical buffer are K, K-1, ..., 0). When the optical switch selects an insertion position for the currently arriving service information, to avoid conflicts with the service information currently being transmitted in the optical buffer, the current queue length is set to the maximum position index of the occupied insertion positions. For example, if the maximum position index for the transmitted service information is 4, even if insertion position 2 is empty, the current queue length is still 4. Therefore, the newly arriving data packet can only be inserted into position 5 and cannot be inserted into any position with a smaller index.

[0074] Because different services may be inserted into different input ports of the optical buffer, and the optical buffer's loss is non-zero, varying degrees of loss may occur to the services. To minimize the loss of the optical buffer on the input services and effectively smooth the output of the input services, the coupling coefficient of the first optical coupler needs to be fixed.

[0075] Optionally, according to the arrangement order from the first optical coupler at the tail end to the first optical coupler at the head end, the coupling coefficient of the i-th first optical coupler is 1 / (i+1).

[0076] Wherein, 1≤i≤N-1, and the number of input ports of the optical buffer is N.

[0077] For an optical buffer with N input ports, (N-1) first optical couplers are required. The first optical coupler farthest from the output port of the optical buffer is labeled as coupler 1. Similarly, the coupler closest to the output port of the optical buffer is labeled as coupler (N-1). Assuming that the loss of the optical fiber delay line is negligible, the coupling coefficient of each first optical coupler can be set as:

[0078] a1=1 / 2, a2=1 / 3, a3=1 / 4……a N-1 =1 / N

[0079] Among them, a1 is the coupling coefficient of coupler 1, a2 is the coupling coefficient of coupler 2, a3 is the coupling coefficient of coupler 3, and a N-1 is the coupling coefficient of coupler N-1.

[0080] Therefore, the power loss of the input service from any input port to the output port of the optical buffer is 10log 10 NdB ensures that all input services experience the same loss after passing through the optical buffer, consistent with the loss of a conventional optical buffer structure based on an optical delay line (ODL). When the optical delay line loss is non-zero, the coupling coefficient of the first optical coupler can be adjusted to ensure that the service input-to-output power ratio remains unchanged.

[0081] As an optional implementation, a switching module of an optical packet switch includes: a first optical demultiplexer, a switching unit, and an optical multiplexer.

[0082] The input end of the first optical demultiplexer is connected to the output end of the wavelength converter, the output end of the first optical demultiplexer is connected to the input end of the switching unit, and the output end of the switching unit is connected to the input end of the optical multiplexer.

[0083] The first optical demultiplexer physically divides traffic on different wavelengths and switches it onto different output fibers. The switching unit switches traffic based on different service requirements. The optical multiplexer multiplexes traffic from different input fibers and aggregates it onto the same fiber for transmission.

[0084] Optionally, the switching unit includes: an optical beam splitter and a second optical coupler.

[0085] The input end of the optical beam splitter is connected to the output end of the first optical demultiplexer, the output end of the optical beam splitter is connected to the input end of the second optical coupler, and the output end of the second optical coupler is connected to the input end of the optical multiplexer.

[0086] The optical beam splitter has an input port and F output ports, where F is the number of optical fibers. The second optical coupler has F input ports and one output port.

[0087] The output of the wavelength converter is connected to the input of the switching module, namely the first optical demultiplexer. Different input wavelengths are physically separated by the first optical demultiplexer. Each separated wavelength link is connected to an optical beam splitter for beam separation. Each separated beam is connected to a fixed second optical coupler. By coupling light beams of the same wavelength from different input ports, a non-blocking optical cross-connect structure is achieved. The output of the second optical coupler is connected to the optical multiplexer. By multiplexing the different wavelengths and the service information they carry onto the output optical fiber, the switching and transmission of services from any wavelength on any input fiber to any output wavelength on any output fiber is achieved.

[0088] As an optional embodiment, the optical packet switch of the present invention further includes: a second optical demultiplexer, wherein the input end of the second optical demultiplexer is connected to the input optical fiber, and the output end of the second optical demultiplexer is connected to the input end of the service aggregator.

[0089] The first optical demultiplexer, second optical demultiplexer, and optical multiplexer can be implemented using thin-film filtering and circulator technology or arrayed waveguide gratings. The optical beam splitter can be implemented using a binary phase grating. The second optical coupler can be implemented using a DIP (Dual In-line Package) or SMD (Surface Mounted Device) package.

[0090] The present invention provides a schematic diagram of the structure of an optical packet switch, such as Figure 4 As shown, the optical packet switch includes: a second wavelength demultiplexer 8, a service aggregator 1 (including Figure 2 The optical switch and optical buffer shown in the figure), the full wavelength converter 2, the first optical demultiplexer 4, the optical beam splitter 5, the second optical coupler 6, and the optical multiplexer 7.

[0091] Assume that the number of input optical fibers F is 4, and each optical fiber supports wavelengths λ1, ..., λ W, the number of wavelengths W is 8, so the scale of the optical switch used for insertion position selection in the input service aggregator is 4X4 (consistent with the number of optical fibers). The multi-wavelength service information from the input optical fiber is decomposed into separate input wavelength channels by the second wavelength demultiplexer 8. This wavelength channel is the wavelength link mentioned above. The same wavelength channels from four different input optical fibers are respectively aggregated into a single channel through the service aggregator 1, realizing the aggregation of service volume and smooth output of service mode. That is, the number of same wavelength channels from different optical fibers is 4, and the four different channels are connected to the 4X4 optical switch. The output ports of the optical switch are respectively connected to the optical buffer with 4 inputs and 1 output. Since the number of wavelengths in a single optical fiber is 8, the number of service aggregators is 8, that is, the number of optical switches and the number of optical buffers are both 8. The output port of the optical buffer is connected to the full wavelength converter 2 to realize the conversion from a specific input wavelength to an arbitrary output wavelength. The output of full-wavelength converter 2 is connected to a first optical demultiplexer 4, which physically separates the eight converted wavelengths. Each of its output ports is connected to a 1x4 optical beam splitter 5, which divides each wavelength into four channels. These channels are then connected to four different 4x1 second optical couplers 6, corresponding to four different output optical fibers. The output of each 4x1 second optical coupler 6 is connected to an optical multiplexer 7, enabling multiplexing and transmission of different wavelength links to the output optical fibers.

[0092] The present invention uses a service aggregator to aggregate services from the same wavelength links of different optical fibers into a single link, significantly reducing the number of switch module ports. This results in a simpler optical packet switch structure, smaller physical size, fewer wavelength converters, higher link resource utilization, and lower economic costs. The optical packet switch of the present invention can be widely used in hybrid optical switching structures to switch and process service categories with lower bandwidth requirements. Furthermore, the optical packet switch of the present invention can also be widely used in access networks to aggregate end-user traffic, providing improved processing capabilities for small service granularity and achieving greater access flexibility.

[0093] The present invention also provides an optical packet switching method, which is applied to Figure 1 or Figure 4 The optical packet switch shown includes a service aggregator, a wavelength converter and a switching module.

[0094] like Figure 5 As shown, the optical packet switching method includes:

[0095] Step 501: The service aggregator aggregates service information of different input optical fibers belonging to the same wavelength link into the same transmission link.

[0096] Step 502: The wavelength converter performs wavelength conversion on the service information converged on the same transmission link to obtain service information of different wavelengths.

[0097] Step 503: The switching module performs service information switching processing on service information of different wavelengths.

[0098] Optionally, the service aggregator aggregates service information of different input optical fibers belonging to the same wavelength link into the same transmission link, including:

[0099] When the cache state of the optical buffer of the service aggregator is that there is a cache area, the optical switch of the service aggregator inputs the service information of different input optical fibers belonging to the same wavelength link to the input port with the shortest delay in the optical buffer;

[0100] The optical buffer caches the input service information and aggregates the service information of different input optical fibers belonging to the same wavelength link into the same transmission link.

[0101] The optical buffer includes an optical fiber delay line and multiple first optical couplers. Two adjacent first optical couplers are connected via the optical fiber delay line. The multiple first optical couplers are connected sequentially, with the input port of each first optical coupler connected to the output port of an optical switch, the output port of the first optical coupler at the tail end connected to the input port of the previous first optical coupler, and the output port of the first optical coupler at the head end connected to a wavelength converter.

[0102] According to the arrangement order from the first optical coupler at the tail end to the first optical coupler at the head end, the coupling coefficient of the i-th first optical coupler is 1 / (i+1); wherein 1≤i≤N-1, and the number of input ports of the optical buffer is N.

[0103] Optionally, the switching module performs service information exchange processing on service information of different wavelengths, including:

[0104] The first optical demultiplexer physically divides the service information on different wavelengths and exchanges it to different wavelength links; the optical beam splitter separates the light beams for each wavelength link; the second optical coupler couples the light beams belonging to the same wavelength; and the optical multiplexer multiplexes the service information carried by different wavelengths to the output optical fiber.

[0105] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. It should also be noted that the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, commodity, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, commodity, or device comprising the element.

[0106] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0107] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An optical packet switch, characterized in that: include: Service aggregators, wavelength converters and switching modules; The service aggregator includes: an optical switch and an optical buffer; The output end of the optical switch is connected to the input end of the optical buffer, and the output end of the optical buffer is connected to the input end of the wavelength converter; The optical switch is used to input service information of different input optical fibers belonging to the same wavelength link into different input ports of the optical buffer; The optical buffer is used to cache the input service information and aggregate the service information of the different input optical fibers belonging to the same wavelength link into the same transmission link; The wavelength converter is used to convert the wavelength of the service information converged on the same transmission link to obtain service information of different wavelengths; The switching module is used to perform service information switching processing on the service information of different wavelengths.

2. The optical packet switch according to claim 1, wherein: The optical buffer comprises: a plurality of first optical couplers; Multiple first optical couplers are connected in sequence, the input port of the first optical coupler is connected to the output port of the optical switch, the output port of the first optical coupler at the tail end is connected to the input port of the previous first optical coupler, and the output port of the first optical coupler at the head end is connected to the wavelength converter.

3. The optical packet switch according to claim 2, wherein: According to the arrangement order from the first optical coupler at the tail end to the first optical coupler at the head end, the coupling coefficient of the i-th first optical coupler is 1 / (i+1); Wherein, 1≤i≤N-1, and N is the number of input ports of the optical buffer.

4. The optical packet switch according to claim 2, wherein: The optical buffer further includes: Fiber optic delay lines; Two adjacent first optical couplers are connected via the optical fiber delay line.

5. The optical packet switch according to any one of claims 1 to 4, characterized in that: The switching module includes: a first optical demultiplexer, a switching unit, and an optical multiplexer; The input end of the first optical demultiplexer is connected to the output end of the wavelength converter, the output end of the first optical demultiplexer is connected to the input end of the switching unit, and the output end of the switching unit is connected to the input end of the optical multiplexer.

6. The optical packet switch according to claim 5, wherein: The switching unit includes: an optical beam splitter and a second optical coupler; The input end of the optical beam splitter is connected to the output end of the first optical demultiplexer, the output end of the optical beam splitter is connected to the input end of the second optical coupler, and the output end of the second optical coupler is connected to the input end of the optical multiplexer.

7. The optical packet switch according to any one of claims 1 to 4, characterized in that: Also includes: a second optical demultiplexer; The input end of the second optical demultiplexer is connected to the input optical fiber, and the output end of the second optical demultiplexer is connected to the input end of the service aggregator.

8. An optical packet switching method, characterized in that: Applied to an optical packet switch, the optical packet switch includes a service aggregator, a wavelength converter, and a switching module, and the method includes: When the cache state of the optical buffer of the service aggregator is that there is a cache area, the optical switch of the service aggregator inputs the service information of different input optical fibers belonging to the same wavelength link to the input port with the shortest delay in the optical buffer; The optical buffer performs buffering processing on the input service information, and aggregates the service information of the different input optical fibers belonging to the same wavelength link into the same transmission link; The wavelength converter performs wavelength conversion on the service information converged on the same transmission link to obtain service information of different wavelengths; The switching module performs service information switching processing on the service information of different wavelengths.

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