WO2012109858A1

WO2012109858A1 - Optical switching device and signal switching system

Info

Publication number: WO2012109858A1
Application number: PCT/CN2011/077798
Authority: WO
Inventors: 邓宁; 操时宜
Original assignee: 华为技术有限公司
Priority date: 2011-07-29
Filing date: 2011-07-29
Publication date: 2012-08-23
Also published as: CN102318364B; CN102318364A

Abstract

An optical switching device, comprising an optical switching apparatus, the optical switching apparatus comprises N-number of optical components for combining, the optical component for combining comprising at least k-number of inputs and at least one output; N-number of optical components for splitting, the optical component for splitting comprising at least one input and at least k-number of outputs; N is larger than or equal to 1 and k is larger than 1; a Cyclic AWG supporting at least k-number of cycles, the Cyclic AWG comprising at least N-number of inputs and at least N-number of outputs; the outputs of the N-number of optical components for combining are connected to the N-number of inputs of the Cyclic AWG; the N-number of outputs of the Cyclic AWG are connected to the inputs of the N-number of optical components used for splitting; the optical components for splitting are used to split the optical signals of different cycles outputted by the Cyclic AWG to different outputs of the optical components for splitting to be outputted.

Description

Optical switching equipment and signal exchange system

Technical field

The present invention relates to the field of optical switching technologies, and in particular, to an optical switching device and a signal switching system. Background technique

With the rapid development of optical communication technologies, Wavelength Division Multiplexing (WDM) technology is widely used, and the number of bits carried on each carrier is also increasing. The demand for large-capacity optical switching fabrics in optical networks is increasing. The bigger it is. In general, the core network node requires a large-capacity space switch fabric, that is, a large-scale air-divided optical switch, such as a network node with four fiber connections and 80 wavelengths per fiber. Optical switching matrix of 320x320 (number of fibers x number of wavelengths per fiber).

The prior art to achieve optical switching matrix including MEMS (Micro-Electro-Mechanical Systems, MEMS) ¹ J and bad array waveguide grating (Arrayed Waveguide Grating, AWG). Although the optical switching matrix using MEMS is relatively mature, its switching time is on the order of milliseconds, which cannot be applied to the microsecond or even nanosecond switching of future all-optical switching (such as optical burst switching, optical switching, etc.). Time requirements, so arrayed waveguide gratings (AWG) are widely used.

Since the capacity of the AWG of NxN is not large, in order to increase the capacity, the prior art provides an AWG cascading method using a plurality of NxNs to expand the capacity, for example, to a capacity of 4Nx4N.

The prior art has the following disadvantages:

The prior art requires the use of multiple NxN AWGs, as well as a large number of tunable lasers or wavelength converters, with complex architectures, and the cascade of multiple NxN AWGs results in energy loss of the optical signal. Summary of the invention

Embodiments of the present invention provide an optical switching apparatus and a signal exchange system, wherein a switching matrix of a kNxkN can be constructed by using an NxN cyclic array waveguide grating Cyclic AWG, and the structure is single and reduces the energy loss of the optical signal.

In view of this, the embodiments of the present invention provide: An optical switching device, comprising: an optical switching device,

The optical switching device includes:

N optical devices for combining, the optical device for combining includes: at least k input ports and at least one output port; wherein N is greater than or equal to 1 and k is greater than 1;

N optical devices for splitting, the optical device for splitting comprising: at least one input port and at least k output ports;

Supporting at least k cycles of a cyclic arrayed waveguide grating Cyclic AWG, the Cyclic AWG comprising: at least N input ports and at least N output ports;

Wherein, the output ports of the N optical devices for combining are connected to the N input ports of the Cyclic AWG; the N output ports of the Cyclic AWG and the N optical devices for shunting Input port connection;

The optical device for splitting is configured to divide the optical signals of different periods output by the Cyclic AWG into different output ports of the optical device for shunting.

A signal exchange system comprising: kN first-stage optical switching devices including at least L optical signal generators, L second-level optical switching devices including at least kN input ports and kN output ports, and kN at least a third-stage optical switching device including L optical signal receivers, wherein the second-stage optical switching device is the optical switching device;

Wherein, the output of the L optical signal generators of the i-th first-stage optical switching device is sequentially connected to the i-th input port of the L second-stage optical switching devices, i from 1 to kN; the jth third-order light The input of the L optical signal receivers of the switching device is sequentially connected to the jth output port of the L second-stage optical switching devices, j from 1 to kN.

Embodiments of the present invention may use a cyclic AWG supporting at least k cycles and including at least N input ports and at least N output ports, N including at least k input ports and at least one output port for combining An optical device, and N optical devices for shunting comprising at least one input port and at least k output ports, wherein the optical device for splitting splits the optical signals of different cycles output by the Cyclic AWG Different output ports are output, thus constructing a (kN) x(kN) switching matrix, avoiding the use of multiple NxN AWGs as in the prior art to expand into a larger capacity switching matrix by multi-stage cascading, structure The unit is single and reduces the energy loss of the optical signal. DRAWINGS In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

Figure 1 is a structural diagram of a 3x3 Cyclic AWG;

Figure 2 shows the spectral response curve from the first input to the second output of the 3 x3 Cyclic AWG;

FIG. 3 is a structural diagram of an optical switching device according to an embodiment of the present invention;

Figure 4a shows a block diagram of a band filter;

Figure 4b shows the spectral response curve of the output of port 281 of the band filter;

5a shows a routing relationship of 12 optical signals of 4 cycles input by the first input port of the optical switching device 200 according to the embodiment of the present invention;

Figure 5b shows the routing relationship of the 12 χ 12 AWG to the optical signal provided by the prior art;

FIG. 6a is a schematic diagram of an FSR according to an embodiment of the present invention;

FIG. 6b is a schematic diagram of a filter of an N-hop m (N skip m ) according to an embodiment of the present invention; FIG. 7 is a structural diagram of a signal exchange system according to an embodiment of the present invention. detailed description

Embodiments of the present invention provide an optical switching device and a signal exchange system, which can construct a kNxkN switching matrix using a circular Cylindrical Waveguide Grid Cyclic AWG, and the structure is single and non-blocking. For a more detailed description of the technical solution provided by the embodiment of the present invention, a Cyclic AWG of 3x3 is taken as an example to introduce a Cyclic AWG:

As shown in Figure 1, it is assumed that the first input of the Cyclic AWG has a wavelength of λ ¹ ) , λ ₂ ⁽¹⁾ , λ ₃ ^{(1) in} one cycle; assuming a second input of the Cyclic AWG The wavelengths input during the period are λ ² ) , λ ₂ ( ² ) , λ ₃ ( ² ) ; It is assumed that the third input of the Cyclic AWG is input with a wavelength of λ ³⁾ , λ ₂ ⁽³⁾ , λ ₃ ⁽³⁾ . Wherein, the subscript of λ indicates the number of the wavelength, and the superscript of λ indicates that the wavelength is input from the first input port, for example, λ ₂ ⁽³⁾ indicates the second input from the third input port of the Cyclic AWG. Wavelengths. The Cyclic AWG can route optical signals of different wavelengths at each input port to different output ports, and the routing relationship is cyclic and guarantees different input ports. The input optical signals of the same wavelength (such as λ, λ ²⁾ , λ ³⁾ ) are not routed to the same output for output. For example, the first input port is routed to the first output port output, and the first input port input λ ₂ ^{(1) is} routed to the second output port output; the first input port is input λ ₃ ⁽¹⁾ route to the output of the third output port; route λ ^{2) of the} input of the second input port to the output of the second output port, and route λ ₂ ^{(2) of the} input of the second input port to the third Output port output, route λ ₃ ^{(2) of the} second input port to the output of the first output port; route λ ^{3) of the} input of the third input port to the output of the third output port, the third will be The input port input λ ₂ ^{(3) is} routed to the first output port output, and the third input port input λ ₃ ^{(3) is} routed to the second output port.

An optical signal generator is connected to each input of the Cyclic AWG for outputting wavelengths to the corresponding input ports of the Cyclic AWG, so that a non-blocking 3x3 optical switching matrix can be realized.

Figure 2 shows the spectral response curve of the first input port to the first output port of the Cyclic AWG. As can be seen from Figure 2, the routing relationship is cyclically routed with three wavelengths as a cycle (Cycle), for example , λ ₄ ⁽¹⁾ has the same routing relationship as λ. Similarly, λ ₅ ⁽¹⁾ has the same routing relationship as λ ₂ ⁽¹⁾ ; λ ₆ ⁽¹⁾ has the same routing relationship as λ ₃ ⁽¹⁾ . Limited by Cyclic AWG waveguide materials and fabrication accuracy, the Cyclic AWG can only route a limited range of wavelengths. Generally, the number of cycles in the operating wavelength range of the Cyclic AWG is referred to as the number of Cycles supported by the Cyclic AWG.

Referring to FIG. 3, an embodiment of the present invention provides an optical switching device, including: an optical switching device 200, where the optical switching device 200 includes:

N optical devices 22 for combining, the optical device for combining includes: at least k input ports and at least one output port; wherein N is greater than or equal to 1 and k is greater than 1;

N optical devices 24 for splitting, the optical device for splitting includes: at least one input port and at least k output ports;

Supporting a Cyclic AWG 20 of at least k cycles of the Cyclic AWG 20, the Cyclic AWG comprising: at least N input ports and at least N output ports.

The optical device for splitting is configured to divide the optical signals of different periods output by the Cyclic AWG into different output ports of the optical device for shunting. Specifically, the functions of each component are as follows:

The optical device 22 for combining means is specifically configured to combine the optical signals received by the respective input ports of the optical combiner 22 and output from the output port of the optical combiner 22 to the Cyclic AWG 20; the light for combining Device 22 can be an optical combiner or a multiplexed band filter.

The Cyclic AWG 20 is specifically configured to route the ith optical signal in each cycle received from the nth input port of the Cyclic AWG 20 to the i+n-1-th output ports of the Cyclic AWG 20. Wherein, when i+n-1 is greater than N, m is equal to N; when i+n-1 is less than or equal to N, m = 0; i<=N, n<=N.

The optical device 24 for shunting is used to divide the optical signals of different periods output by the Cyclic AWG 20 into different output ports of the optical device 24 for shunting. For example, the optical signal of the jth cycle is output to the jth output port of the optical device 24 for shunting, j is from 1 to k. For another example, assuming that k=4, the optical device 24 for shunting can also distribute the optical signal in the first cycle of the output of the Cyclic AWG 20 to the fourth output of the optical device 24 for shunting. The optical signal in the second cycle of the output of the Cyclic AWG 20 is distributed to the third output of the optical device 24 for shunting, and the optical signal in the third cycle of the output of the Cyclic AWG 20 is used. The second output port of the branched optical device 24 is output, and the optical signal in the fourth cycle of the output of the Cyclic AWG 20 is distributed to the first output port of the optical device 24 for shunting. Wherein, the optical device 24 for shunting may be a demultiplexing band filter.

Assume that the optical device 24 for shunting is a demultiplexing filter. As shown in FIG. 4a, the demultiplexing filter has an input port 26 and k output ports 28, numbered 281, 282, 283, respectively. .. 28k. The spectral response curve outputted by the output port 281 is shown as 301 in Fig. 4b, and the spectral response curve of the output port 282 is shown as 302 in Fig. 4b, and the spectral response curve of the output port 28k is shown as 30k in Fig. 4b. Assuming N=3, k=4, the demultiplexing filter can filter out the optical signals of the four bands, each band being an FSR of the AWG, where one band corresponds to one cycle, where 1 : 4 indicates that the demultiplexer filter has one input port and four output ports.

As described in a preferred embodiment, the first input port of the optical switching device (ie, the connection)

The routing relationship of the optical signals input by the first input port of the first optical combiner of the Cyclic AWG 20, in this embodiment, the optical device 22 for combining is a combiner for splitting Optical device 24 is described as a split-band filter sub-example:

The routing relationship for each optical signal in the first cycle is: Λι— > First combiner> The first input of Cyclic AWG 20> The first output of Cyclic AWG 20> The first output of the first demultiplexer filter (ie The first output port of the optical switching device;);

λ ₂ — > the first combiner of the first combiner>Cyclic AWG 20—> the second output of the Cyclic AWG 20>the first output of the second demultiplexer filter (ie The k+ _1th output port of the optical switching device;); λ _Ν -> the first combiner> the first input port of the Cyclic AWG 20> the Nth output port of the Cyclic AWG 20> The first output port of the N demultiplexer filters (ie, the (N-1) x k+1 output ports of the optical switching device;);

The routing relationship for each optical signal in the second cycle is:

λ _Ν+1 — > First combiner 1>Cyclic AWG 20's first input port>Cyclic AWG 20's first output port>The second output port of the first demultiplexer filter (ie the second output of the optical switching device;);

λ _Ν+2 — > First Combiner 1>Cyclic AWG 20's first input port> Cyclic AWG

The second output port of 20 is the second output port of the second demultiplexer filter (i.e., the 2k+2 output ports of the optical switching device).

λ _2Ν — > First combiner> The first input of the Cyclic AWG 20> The Nth output of the Cyclic AWG 20> The second output of the Nth splitter filter (ie The (N-l) x k+2 output ports of the optical switching device).

The routing relationship for each optical signal of the kth period is:

λ^ι) _Ν+ ι—> First combiner> The first input of Cyclic AWG 20> The first output of Cyclic AWG 20> The kth of the Nth splitter filter Output ports (ie, the kth output port of the optical switching device);

λ _{(] ί -} ΐ) Ν ₊ 2 - > First Combiner 1 > Cyclic AWG 20's first input port > Cyclic AWG 20's second output port 1 > Nth demultiplexing band filter The kth output port (ie, the 2k+k output ports of the optical switching device;);

M—> First combiner> The first input of Cyclic AWG 20> Cyclic AWG The Nth output of 20 is the >kth output of the Nth demultiplexer filter.

The routing relationship of the optical signal input by the k+1th input port of the optical switching device (ie, the first input port of the second optical combiner connected to the Cyclic AWG 20) is described in the following preferred embodiment. In this embodiment, the optical device 22 for combining is a combiner, and the optical device 24 for shunting is described as a sub-band filter:

The routing relationship for each optical signal in the first cycle is:

Λι— > The second combiner> The second input of the Cyclic AWG 20> The second output of the Cyclic AWG 20> The first output of the second band filter (ie the light The k+1th output port of the switching device;);

λ ₂ — > second combiner 1> the second input of the Cyclic AWG 20, the third output of the Cyclic AWG 20, the first output of the third band filter (ie the optical exchange) The 2k+l output port of the device;); λ _Ν — > the second combiner 1> the second input port of the Cyclic AWG 20> The first output port of the Cyclic AWG 20 > the first wave a first output port with a filter (ie, the first output port of the optical switching device);

The routing relationship for each optical signal in the second cycle is:

λ _Ν second combiner > the second input of the Cyclic AWG 20 > the second output of the Cyclic AWG 20 > the second output of the second band filter;

λ _Ν second combiner> second input of Cyclic AWG 20> Cyclic

The third output port of the AWG 20 is a second output port of the third band filter (ie, the 2k+l output port of the optical switching device); λ _2Ν -> the second combiner >Cyclic AWG 20's second input port Cyclic AWG 20's first output port>the second output port of the first band filter (ie, the first output port of the optical switching device);

The routing relationship of each optical signal for the kth period is: λ _(]ί -ΐ)Ν ₊ ι— > The second combiner> The second input of the Cyclic AWG 20> The second output of the Cyclic AWG 20> The second band filter The kth output port;

λ _(]ί- ΐ)Ν ₊ 2 — > Second combiner> The second input of Cyclic AWG 20> The third output of Cyclic AWG 20> The third band filter The kth output port;

Λι,Ν— > Second Combiner 1 >Cyclic AWG 20's second input port>Cyclic AWG

The first output of 20 is the first k-th output of the first band filter.

As can be seen from the above description, the optical signals of the first period of the k cycles (the wavelengths are denoted as λ, λ ₂ .... λ _Ν respectively) from the first output of each of the demultiplexed bands filters The output, for example, is that the first input port of the optical switching device inputs a wavelength of a human light signal from the first output port of the first demultiplexing band filter, and the wavelength of the first input port of the optical switching device is input. The optical signal of λ ₂ is from the first output of the second demultiplexing filter, and so on; for example, the k+1th input of the optical switching device (ie the second connected to the Cyclic AWG 20) The first input port of the optical combiner) inputs the optical signal from the first output port of the second band filter; the k+1th input port of the optical switching device (ie, the Cyclic AWG 20 is connected) The first input port of the _second optical combiner) inputs the optical signal of wavelength λ ₂ from the first output of the third band filter. The optical signals of the second period of the k cycles (the wavelengths are respectively denoted as λ Ν +1, Α Ν + 2 · · · · λ 2 Ν ) are respectively output from the second output port of each of the _{demultiplexed} band filters, For example, the optical signal of the wavelength λ _{Ν +1} input from the first input port of the optical switching device is output from the second output port of the first demultiplexing band filter, and the optical signal of the wavelength λ _Ν+2 is from the first The second output of the two split-band filters is output, and so on. For another example, the k+1th input port of the optical switching device (ie, the first input port of the second optical combiner connected to the Cyclic AWG 20) inputs the optical signal of the wavelength λ _N+1 from the second wave. a second output port with a filter; the k+1th input port of the optical switching device (ie, the first input port of the second optical combiner connected to the Cyclic AWG 20) is input at a wavelength of λ _{Ν + 2} The optical signal is from the second output of the third band filter. k cycles of respective optical signals in the third cycle (as represented wavelengths _{_{λ Ν + 1, λ Ν +}} 2 .... λ 2Ν) are outputted from the third output port of the sub-band filter, And so on, the optical signals (λ^ _{1) Ν+1} , _{(kA) N+2} .... X _m ) of the kth cycle of k cycles are respectively obtained from the kth of each demultiplexed band filter Output port output.

In the preferred embodiment, the ith optical signal in each cycle received from the nth input port of the Cyclic AWG 20 is routed to the i+n-1th output port of the Cyclic AWG 20, and then The sub-band filter connected to the i+n-1-m outputs of the Cyclic AWG 20 will have different periods The i optical signals are respectively routed to different output ports for output; wherein, when i+n-1 is greater than N, m is equal to N; when i+n-1 is less than or equal to N, m = 0; i<=N, n<=N. For example, for an optical signal input from the first input port of the optical switching device, regardless of which cycle the optical signal belongs to, as long as it is the ith optical signal of one cycle, it is routed to the i-th of the Cyclic AWG 20. On the output port, the i-th optical signal connected to the ith output port of the Cyclic AWG 20 is respectively routed to the different output ports for output of the different output signals; the k+1th of the optical switching device The optical signal input to the input port (ie, the first input port of the second optical combiner connected to the Cyclic AWG 20), regardless of which cycle the optical signal belongs to, is routed to the first optical signal in the cycle. The second output of the Cyclic AWG 20 is routed to the third output of the Cyclic AWG 20 as long as it is the second optical signal in the cycle, and so on.

Figure 5a shows the routing relationship of 12 optical signals of 4 cycles input by the first input port of the optical switching device provided by the embodiment of the present invention, where N=3, k=4, where each optical signal is underneath The number indicates that the optical signal is output from the first output of the optical switching device. Figure 5b shows the routing relationship of the 12x12 AWG provided by the prior art to the incoming optical signal. Comparing FIG. 5a and FIG. 5b, it can be seen that the optical switching device provided by the embodiment of the present invention functions similarly to the 12x 12 AWG, and the difference is that the optical signal input to the first input port and the output port are The correspondence is different.

Optionally, the optical switching device further includes: an optical signal generator 100 connected to the input port of the optical combiner; wherein the optical signal generator may be a laser or a wavelength converter, which does not affect the implementation of the present invention. If the optical signal input from the Xth input port of the optical switching device needs to be output from the yth output port of the optical switching device, the optical signal generator 100 outputs an optical signal to the Xth input port of the optical switching device. The wavelength is:

When y ≥ x, λ = λ ₀ + { L(yx) / kJ + N- [(yx) mod k] } · Δλ;

When y<x, λ = λ ₀ + { L(y-x+kN)/kJ + Ν· [(y-x+kN)mod k] } ·Δλ

Among them, "" means rounding down, λ. It is the center wavelength of the Xth input port, that is, the wavelength of the optical signal output from the optical signal generator 100 to the Xth input port when the Xth input port is input and outputted by the Xth output port. Δλ is the wavelength spacing of the Cyclic AWG 20, which is usually the wavelength spacing corresponding to the optical frequency of 50 GHz or 100 GHz. Where x = (al) x k+b; y = (c- l) x k+d; the Xth input of the optical switching device is the bth input of the ath combiner, where 1 <a<N , 1 <b<k; the yth output port of the optical switching device is the dth output port of the cth demultiplexing band filter, wherein l <c <N, l < d <k; Relationship optical signal _{_{(λ, λ 2, λ 3}} ....) this expression [lambda] is as described above: λ ₀ corresponding to the foregoing λ ₀ + Δλ corresponds to λ _{2 in the} foregoing; λ ₀ + ₂ Δλ corresponds to λ ₃ in the foregoing, assuming N=3, k=4, then λο+1 ΙΔλ corresponds to _kN in the foregoing.

Embodiments of the present invention may use a cyclic AWG supporting at least k cycles and including at least N input ports and at least N output ports, N including at least k input ports and at least one output port for combining An optical device, and N optical devices for splitting comprising at least one input port and at least k output ports, wherein the optical device for splitting splits the optical signals of different cycles output by the Cyclic AWG Different output port outputs, thus constructed as a (kN) x (kN) switching matrix, avoiding the use of multiple NxN AWGs as in the prior art to expand into a larger capacity switching matrix by multi-stage cascading, having a structure The advantages of the single order, the reduction of the energy loss of the optical signal, the control of the tube, and the low cost, and the use of the above-mentioned optical switching device, combined with the high-speed optical signal generator, can achieve strict non-blocking switching, and can achieve high speed (such as nanoseconds) Level) optical switching. Among them, strict non-blocking switching refers to strict non-blocking in the sense of the entire switching matrix including the optical signal generator. From the perspective of the entire switching matrix, the optical signal generator can be provided for any input port of the optical switching device. The non-repetitive wavelength allows it to be output from any of the output ports of the optical switching device, ensuring that no blockage occurs inside the entire switching matrix.

Wherein, for the N optical devices for combining in the above optical switching device provided by the embodiment of the present invention, each optical device for combining includes at least k input ports, which can be used for each of the combined paths. An optical signal generator is connected to each input port of the optical device, so that kN optical signal generators are needed, and the optical signal generator can be connected to the input port of the combiner that only needs to receive the optical signal, without affecting the present invention. Implementation. The optical device for combining may be an ordinary combiner or a multiplexer filter. When the optical device for combining is a common combiner, the common The tunable wavelength range of the optical signal generator to which the input port of the combiner is connected (ie, the wavelength range of the optical signal output by the optical signal generator) is

That is kxFSR. When the optical device for combining is a k:1 multiplex band filter, that is, a multiplex band filter including at least k input ports and at least one output port, due to the k: l combination Each input port of the band filter can only receive the optical signal of one band, so the optical signal generator connected to each input port of the k:1 multiplex band filter only needs to provide N adjustable At the wavelength, the tunable wavelength range of the optical signal generator connected to each input port of the k:1 multiplex band filter is ΝχΔλ, that is, the tunable wavelength range is FSR. Wherein, an output port of the optical device for shunting needs to filter out all the optical signals of a certain period separately, and exclude all optical signals of other periods, for example, the first one of each optical device for shunting an output port and filtered out of the first cycle are all of the optical signals _{_{_{λ 2, λ 3 ..... λ Ν}}} , the exclusion of all other cycles of the optical signal, such as the _λ Ν adjacent _λ Ν _{+ 1.} Generally, the optical device for shunting can adopt a split-band filter of skipping 0 (N skip O ) as shown by a thick broken line in Fig. 4b. However, the split-band filter of N hop 0 (N skip 0 ) requires that the filter curve is very steep, that is, the rising and falling edges of the filter curve are very steep, which is very difficult to design and costly. In a preferred embodiment, the optical device for shunting may employ a split-band filter of N hop m (N skip m ). Due to the effective refractive index of the slab waveguide and the array waveguide of the Cyclic AWG, the size of the FSR can be changed, so that those skilled in the art can adjust the effective refractive index of the slab waveguide and the array waveguide by reasonable design and reasonable control in the manufacturing process, so as to change The size of the FSR. Specifically, the FSR of the Cyclic AWG can be designed as: FSR=NxA +G, where Δλ is the wavelength spacing of the Cyclic AWG, G is a wavelength protection band, G≥ηΐχΔλ, G>0, wherein the FSR can be as As shown in Fig. 6a, the demultiplexing band filter of N hop m (N skip m ) is shown by the thick broken line in Fig. 6b. Referring to FIG. 7, an embodiment of the present invention provides a signal exchange system, including:

kN first-stage optical switching devices 70 including at least L optical signal generators, L second-level optical switching devices 80 including at least kN input ports and kN output ports, and kN at least L optical signals The third-stage optical switching device 90 of the receiver, wherein the specific performance of the second-stage optical switching device 80 is the same as that of the optical switching device described in the foregoing embodiment, and details are not described herein again.

The output of the L optical signal generators of the i-th first-stage optical switching device 70 is sequentially connected to the i-th input port of the L second-stage optical switching devices 80. The specific description is as follows: The first first-level light The output of the first optical signal generator of the switching device 70 is connected to the first input port of the first second-stage optical switching device 80, and the second optical signal generator of the first first-stage optical switching device 70 The output is connected to the first input port of the second second-stage optical switching device 80, and so on, and the output of the Lth optical signal generator of the first first-stage optical switching device 70 is connected to the Lth second stage. The first input port of the optical switching device 80; similarly, the first The output of the first optical signal generator of the kN first-stage optical switching devices 70 is connected to the kNth input port of the first second-stage optical switching device 80, and the second of the kN first-stage optical switching devices 70 The output of the optical signal generator is connected to the kNth input port of the second second-stage optical switching device 80, and so on, and the output of the Lth optical signal generator of the kNth first-stage optical switching device 70 is connected. The kNth input port of the Lth second stage optical switching device 80.

The input order of the L optical signal receivers of the jth third-stage optical switching device 90 is sequentially connected to the jth output port of the L second-stage optical switching devices, and the specific example is as follows: The first third-level optical switching The input of the first optical signal receiver of the device 90 is connected to the first output port of the first second-stage optical switching device, and the input of the second optical signal receiver of the first tertiary optical switching device 90 is connected. The first output port of the second second-stage optical switching device, and the input of the L-th optical signal receiver of the first third-stage optical switching device 90 is connected to the first of the L-th second-stage optical switching devices Similarly, the input of the first optical signal receiver of the kNth third-stage optical switching device 90 is connected to the kNth output port of the first second-stage optical switching device, and the kNth third-order optical The input of the second optical signal receiver of the switching device 90 is connected to the kNth output port of the second second-stage optical switching device, and the input of the Lth optical signal receiver of the kNth third-stage optical switching device 90 Connecting the kNth output ports of the Lth second stage optical switching device.

It should be noted that the first-stage optical switching device 70 may specifically be an exchange device that needs to perform optical-electrical-to-optical conversion, such as a switch, a router, a switching board or a cross-board of a transmitting device, or an all-optical switching device based on an AWG. .

When the first-stage optical switching device 70 is a switching device with optical-electrical-to-optical conversion, the first-stage optical switching device 70 specifically includes: an input port 71, a first switching unit, a photoelectric conversion unit, and L optical signals. The first switching unit and the photoelectric conversion unit are not shown in FIG. 7. Specifically, the photoelectric conversion unit is configured to photoelectrically convert an optical signal input by the input port, and output the converted electrical signal; and the first switching unit is configured to output an electrical signal of the photoelectric conversion unit. The output is performed after the exchange; the optical signal generator is configured to generate an optical signal and carry the electrical signal number output by the first switching unit on the generated optical signal for output. In this configuration, the optical signal generator may specifically be a laser capable of generating a wavelength, such as an internal modulation laser or an external modulation laser.

When the first-stage optical switching device 70 is an AWG-based all-optical switching device, the first-stage optical switching device 70 specifically includes: an input port 71, a first switching unit, and L optical signal generators 72; The switching unit is not shown in FIG. Specifically, the first switching unit is configured to use the input port The input optical signal is exchanged and output; the optical signal generator is configured to perform wavelength conversion on the optical signal output by the first switching unit and output the optical signal. In this configuration, the optical signal generator may specifically be a wavelength converter.

The switching capacity of the first-stage optical switching device 70 is C, that is, the switching capacity is C = the number of input ports. The maximum transmission rate supported by the X input port = the number of optical signal generators X The maximum switching rate supported by the optical signal generator . The signal input by the input port 71 may be: SDH (Synchronous Digital Hierarchy) / SONET (Synchronous Optical Network) signal, OTN (Optical Transport Network) signal, E1/T1 Series signals, Ethernet signals, or various types of signals carrying IP packets or MPLS (Multi-Protocol Label Switching) or other >3⁄4 text.

Wherein, if the optical device for combining in the second-stage optical switching device is a multiplex band filter, the optical signal output by the optical signal generator in the first-stage optical switching device has a wavelength range of FSR, wherein , FSR is the free spectral region of the Cyclic AWG. If the optical device for combining in the second-stage optical switching device is a general combiner, the optical signal output by the optical signal generator in the first-stage optical switching device has a wavelength range of kxFSR, where FSR is The free spectral region of the Cyclic AWG.

When the optical signal of the wavelength λ outputted by the optical signal generator to the Xth input port of the second stage optical switching device needs to be output from the yth output port of the second stage optical switching device, the λ (ie the wavelength λ that the optical signal generator should produce):

^y≥ , λ=λ ₀ + { L(y_x)/k" + Νχ [(yx)mod k] } χΔλ;

When y<x, λ=λ ₀ + { L (y-x+kN) /kj + Νχ [ (y-x+kN) mod k] } χΔλ;

Where x=(al)xk+b; y=(cl)xk+d; the xth input port of the optical switching device is the bth input port of the a-th optical device for combining, wherein l ≤ a ≤ N, l < b < k; the yth output port of the optical switching device is the dth output port of the cth optical device for shunting, wherein l ≤ c ≤ N, l<d<k; where λ. It is a center wavelength input to the Xth input port of the second stage optical switching device, and the center wavelength is a wavelength of an optical signal generated by the optical signal generator that should be output from the Xth output port.

It should be noted that the third-stage optical switching device 90 may specifically be an exchange device that needs to perform optical-electrical-to-optical conversion, such as a switch, a router, a switching board or a cross-board of a transmitting device, or an all-optical switching device based on an AWG. . When the third-stage optical switching device 90 is a switching device that needs to perform optical-electrical-to-optical conversion, the third-stage optical switching device 90 includes L optical signal receivers 91, a second switching unit, an electro-optical conversion unit, and an output. Port 92; wherein the second switching unit and the electro-optical conversion unit are not shown in FIG. Specifically, the optical signal receiver is configured to perform photoelectric conversion on the optical signal outputted by the second-stage optical switching device to obtain an electrical signal, and output the second signal, and the second switching unit is configured to output the optical signal receiver. The electrical signals are exchanged; the electrical and optical conversion unit is configured to perform electrical and optical conversion on the electrical signals exchanged by the second switching unit, and output the signals to the output port.

When the third-stage optical switching device 90 is an AWG-based all-optical switching device, the third-stage optical switching device 90 includes L optical signal receivers 91, a second switching unit, and an output port 92; wherein, the second switching The unit is not shown in FIG. Specifically, the optical signal receiver is configured to perform wavelength conversion on the optical signal output by the second-stage optical switching device, and output the optical signal to the second switching unit, where the second switching unit is configured to receive the optical signal receiver The output optical signal is exchanged and output to the output port. The signal exchange system provided by the embodiment of the present invention includes three stages, namely, a first-stage optical switching device 70 as an input stage, and a second-stage optical switching device as an intermediate stage. 80, and a third-stage optical switching device 90 as an output stage, the three stages are connected in a full mesh connection. Since the switching capacity of the first-stage optical switching device 70 and the third-stage optical switching device 90 is C, the switching capacity kNxC of the entire handshake system.

A person skilled in the art can understand that all or part of the steps of implementing the foregoing embodiments may be performed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, such as a read only memory. Disk or disc, etc.

The foregoing detailed description of the optical switching device and the signal switching system provided by the embodiments of the present invention is only for facilitating understanding of the method and core idea of the present invention. Meanwhile, for those skilled in the art, according to the present invention, The present invention is not limited by the scope of the present invention.

Claims

Rights request

An optical switching device, comprising: an optical switching device,

The optical switching device includes:

2. The optical switching device according to claim 1, wherein

The free spectral region of the Cyclic AWG is FSR = NxA + G, wherein Δλ is the channel spacing of the Cyclic AWG; and G is the wavelength guard band.

3. The optical switching device according to claim 2, wherein

The optical device for shunting is a demultiplexing band filter of N hop m, where mxA ≤ G.

4. The optical switching device according to claim 1, wherein

The optical switching device according to claim 4, further comprising:

An optical signal generator connected to an input port of the optical combiner in the optical switching device; when the optical device for combining is a combined band filter, a wavelength of an optical signal output by the optical signal generator The range is FSR, where FSR is the free spectral region of the Cyclic AWG.

6. The optical switching device of claim 4, further comprising:

An optical signal generator connected to an input port of the optical combiner in the optical switching device; when the optical device for combining is an optical combiner, a wavelength range of the optical signal output by the optical signal generator is kxFSR, where FSR is the free spectral region of the Cyclic AWG.

7. The optical switching device according to claim 5 or 6, wherein

When the optical signal generator outputs an optical signal of wavelength λ outputted to the Xth input port of the optical switching device from the yth output port of the optical switching device, the λ is:

^y≥ , λ=λ ₀ + { L(y_x)/k" + Νχ [(yx)mod k] } χΔλ;

When y<x, λ=λ ₀ + { L(y_x+kN)/k" + Νχ [ (y-x+kN) mod k] } χΔλ;

Where x=(al)xk+b; y=(cl)xk+d; the xth input port of the optical switching device is the bth input port of the a-th optical device for combining, wherein l ≤ a ≤ N, l < b < k; the yth output port of the optical switching device is the dth output port of the cth optical device for shunting, wherein l ≤ c ≤ N, l<d<k;

Where λ. It is a center wavelength input to the Xth input port of the optical switching device, and the center wavelength is a wavelength of an optical signal generated by the optical signal generator that should be output from the Xth output port.

8. A signal exchange system, comprising: kN first-stage optical switching devices including at least L optical signal generators, and L second-level optical lights including at least kN input ports and kN output ports a switching device and kN third-stage optical switching devices including at least L optical signal receivers, wherein the second-stage optical switching device is the optical switching device according to claims 1-4;

9. The signal exchange system of claim 8 wherein:

When the optical device for combining is a multiplexed band filter, the optical signal generated by the optical signal generator has a wavelength range of FSR, wherein FSR is a free spectral region of the Cyclic AWG.

10. The signal exchange system of claim 8 wherein:

When the optical device for combining is a combiner, the optical signal generated by the optical signal generator has a wavelength range of kxFSR, wherein FSR is a free spectral region of the Cyclic AWG.

11. A signal exchange system according to claim 9 or 10, characterized in that

When the optical signal of the wavelength λ outputted by the optical signal generator to the Xth input port of the second stage optical switching device needs to be output from the yth output port of the second stage optical switching device, the λ Is: ^y≥ , λ=λ ₀ + { L(y_x)/k" + Νχ [(yx)mod k] } χΔλ; When y<x, λ=λ ₀ + { L(y_x+kN)/k" + Νχ [ (y-x+kN) mod k] } χΔλ; where x=(al)xk+b; y=( Cl)xk+d; the xth input port of the optical switching device is the bth input port of the a-th optical device for combining, wherein l≤a≤N, l<b<k; The yth output port of the optical switching device is the dth output port of the cth optical device for shunting, wherein l≤c≤N, l<d<k;

Wherein ^ is the center wavelength input by the Xth input port of the second stage optical switching device, and the center wavelength is the wavelength of the optical signal generated by the optical signal generator that should be output from the Xth output port.