JP2005117507A - Optical communication network system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase communication capacity by increasing an optical path between communication nodes. <P>SOLUTION: In the optical communication network system comprising a plurality of communication nodes 200-1 to 200-3, a wavelength band routing device 210, and optical transmission lines 220-1 to 220-3 and 230-1 to 230-3 for connecting the communication nodes and the wavelength band routing device, the wavelength band routing device comprises N (N is an integer of ≥2) pieces of input ports in one-to-one connection with the communication nodes via the optical transmission lines and N pieces of output ports, outputs an optical signal inputted to one input port to any one of different output ports corresponding to a wavelength band to which a wavelength of the optical signal belongs, and outputs optical signals which are inputted from different input ports and belong to the same wavelength band, from different output ports. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plurality of communication nodes, an optical communication network system using wavelength routing for establishing communication between these communication nodes by path control based on the wavelength of an optical signal, and a wavelength routing apparatus thereof.

  Wavelength division multiplexing (WDM) communication technology, which multiplexes and transmits multiple optical signals with different wavelengths within a single optical fiber, has greatly increased the transmission capacity between two points. However, at present, routing of data packets in each communication node is performed by converting optical signals into electrical signals and performing electrical processing. This is a bottleneck, and supports higher transmission speeds and larger capacities. become unable.

As a solution to this problem, wavelength path routing has been proposed in which optical information is routed as it is by assigning destination information to each optical signal multiplexed by WDM without converting it into an electrical signal. ing.
FIG. 9 shows an optical communication network system based on wavelength path routing realized by using an arrayed waveguide diffraction grating having a wavelength routing function (see, for example, Non-Patent Document 1).

The optical communication network shown in FIG. 9 shows the case where there are four communication nodes, where 100-1 to 100-4 are communication nodes, 110 is an array diffraction grating having four input ports and four output ports. Waveguides, 120-1 to 120-4 are upstream optical transmission lines through which optical signals transmitted from each communication node to the array diffraction grating waveguide 110 pass, and 130-1 to 130-4 are array waveguide diffraction gratings This is a downstream transmission path through which an optical signal passes from 110 to each communication node.
The arrayed waveguide grating 110 is an optical component having input ports 140-1 to 140-4 and output ports 150-1 to 150-4, and the optical signal input to the input ports 140-1 to 140-4 The output ports 150-1 to 150-4 to be output are uniquely determined by the wavelength of the optical signal.

The upstream optical transmission lines 120-1 to 120-4 are connected to the input ports 140-1 to 140-4 of the arrayed waveguide diffraction grating 110, respectively, and the downstream optical transmission lines 130-1 to 130-4 are arrayed, respectively. The waveguides 110 are connected to output ports 150-1 to 150-4 of the waveguide diffraction grating 110.
FIG. 2 shows input ports 140-1 to 140-4 of a 4 × 4 arrayed waveguide grating 110 having four input ports 140-1 to 140-4 and four output ports 150-1 to 150-4. It shows how the four output ports 150-1 to 150-4 are connected by wavelength.

For example, in FIG. 9, when an optical signal having a wavelength of λ3 is input to the input port 140-1, the optical signal of λ3 is output from the output port 150-3. Therefore, when an optical signal having a wavelength λ3 is transmitted from the communication node 100-1, the optical signal having a wavelength λ3 is input to the input port 140-1 of the arrayed waveguide grating 110 through the optical transmission line 120-1, and is transmitted by wavelength routing. The optical signal of λ3 reaches the communication node 100-3 through the optical transmission line 130-3. Thus, by using the wavelength routing function of the arrayed waveguide grating 110, the communication nodes 100-1 to 100 perform routing in the optical layer based on the wavelength of the optical signal without converting the optical signal into an electrical signal. Full-mesh network communication between 100-4 is possible.
K. Kato et. Al., “32 × 32 full-mesh (1024 path) wavelength -routing WDM network based on uniform-loss cyclic-frequency arrayed waveguide grating” Electronics Letters, vol. 33, 1865-1866, 1977.

In the optical communication network system based on the wavelength routing of the conventional arrayed waveguide grating 110 described above, the communication node 100-1 can send information to the communication node 100-3 by an optical signal of wavelength λ3. It is difficult to increase the communication capacity from the node 100-1 to the communication node 100-3 beyond the transmission capacity of one-wave optical signal.
In other words, the conventional technology can establish only one optical path between two communication nodes. As described above, the conventional optical communication network system based on the wavelength routing of the arrayed waveguide grating 110 has a problem that it is very difficult to increase the communication capacity by increasing the optical paths between the communication nodes.

  The present invention has been made in view of the above circumstances, and is capable of increasing the optical path between communication nodes, thereby enabling to increase the communication capacity, and is excellent in flexibility and expandability. An object is to provide a communication network system.

  In order to achieve the above-mentioned object, the invention according to claim 1 comprises a plurality of communication nodes, a wavelength band routing device for routing a communication path between the communication nodes based on a wavelength band to which an optical signal belongs, and the communication In an optical communication network system comprising an optical transmission line that connects a node and the wavelength band routing device to form a communication path, the wavelength band routing device is paired with the communication node via the optical transmission line. N (N is an integer greater than or equal to 2) input ports connected to 1 and N output ports connected to the communication node on a one-to-one basis via the optical transmission line, and one input An optical signal that is input to a port and that is output to a different output port according to the wavelength band to which the wavelength of the optical signal belongs, and that belongs to the same wavelength band that is input from a different input port And outputs from different output ports.

According to a second aspect of the present invention, there are provided a plurality of communication nodes, a wavelength band routing device for routing a communication path between the communication nodes based on a wavelength band to which an optical signal belongs, the communication node and the wavelength band routing. In an optical communication network system comprising an optical transmission line that connects devices and forms a communication path, the wavelength band routing device is connected to the communication node in a one-to-one relationship via the optical transmission line. (N is an integer of 2 or more) input ports and N output ports connected one-to-one to the communication node via the optical transmission line, and light input to one input port The signal is a wavelength band B _m to which the wavelength of the optical signal belongs (wavelength band B _m = center wavelength λB _m ± wavelength bandwidth Δλ _m , where λB _m + Δλ _m ≦ λB _{m + 1} -Δλ _{m + 1} 1 ≦ m ≤ N, m is an integer) Optical signals belonging to the same wavelength band that are output to different output ports and input from different input ports are output from different output ports, and the communication node has K (K is an integer of 2 or more) input ports. Each of the K input ports IP [1], IP [2], IP [3],... IP [K] are wavelength band B ₁ , wavelength band B ₂ , wavelength A band B ₃ ,..., A K × 1 wavelength band optical multiplexer that outputs an optical signal of a wavelength belonging to each wavelength band of the wavelength band B _{K to} the output port, and one output port, Connects to the kth (k is an integer, 1 ≦ k ≦ K) th port of each input port IP [1], IP [2], IP [3], ... IP [K] of the K × 1 wavelength band multiplexer It is, for the input ports IP connected [k], belongs to the wavelength-multiplexed optical signal or a wavelength band B _k of different optical signals with multiple wavelengths belonging to the wavelength band B _k Sends the optical signal of one wavelength, and at least one light transmitting section, K (K is an integer of 2 or more) output ports and one input port, is the one input port, the wavelength band B ₁ , wavelength band B ₂ , wavelength band B ₃ ,..., An optical signal having a wavelength belonging to each of the wavelength bands B _K is sent to the K output ports OP [1], OP [2], OP [3] , ... 1 × K wavelength band optical separator that outputs to OP [K] and one input port, each output port OP [1], OP [2] of the 1 × K wavelength band optical separator OP [3],... OP [K] is connected one-to-one to the kth port (k is an integer, 1 ≦ k ≦ K) and sent from the connected input port OP [k]. At least one optical receiver capable of receiving a wavelength-multiplexed optical signal composed of a plurality of optical signals having different wavelengths belonging to the wavelength band B _k , and the output port of the K × 1 wavelength band optical multiplexer includes the output port The input of the wavelength band routing device The ports are connected one-to-one via an optical waveguide, and the input port of the 1 × K wavelength band optical separator is connected one-to-one via the optical waveguide to the output port of the wavelength routing device It is characterized by being.

The invention according to claim 3 is the optical communication network system according to claim 2, wherein the wavelength band routing device has J (J is an integer equal to or greater than N) output ports and one input port. The one input port is connected to one of the input ports of the wavelength band routing device on a one-to-one basis, and the wavelength band B ₁ , the wavelength band B ₂ , and the wavelength band B ₃ input from the one input port. ,... N 1 × J wavelengths for outputting an optical signal having a wavelength within each wavelength band B _J to any one of the J output ports according to the wavelength band to which the optical signal belongs. A band optical separator, one output port and J input ports, and the output port is connected to one of the output ports of the wavelength band routing device on a one-to-one basis; N input ports Wavelength band B ₁ are input, the wavelength band B _2, the wavelength band B _3, ... N-number of J × 1 optical signals having a wavelength falling within the wavelength band of the wavelength band B _J, to be output to the one output port Each of the output ports of the 1 × J wavelength band optical separator is connected to one of the input ports of the different J × 1 wavelength band optical multiplexer. The wavelength band optical multiplexers are connected in a one-to-one relationship so that there is no overlap in the wavelength bands to which optical signals input from different ports belong.

  According to a fourth aspect of the present invention, in the optical communication network system according to the second or third aspect, the optical transmission unit includes one optical transmitter, and the optical transmitter transmits the optical transmission. It is connected to the output port of the unit.

  According to a fifth aspect of the present invention, in the optical communication network system according to the second or third aspect, the optical transmitter includes a plurality of optical transmitters having different wavelengths of optical signals to be transmitted, and a plurality of optical transmitters. And an optical multiplexer that outputs an optical signal input from the input port from the output port, and the output port of the optical multiplexer is an output port of the optical transmitter And an input port of the optical multiplexer is connected to the optical transmitter on a one-to-one basis.

  According to a sixth aspect of the present invention, in the optical communication network system according to the second or third aspect, the optical receiver includes one optical receiver, and the optical receiver receives the optical receiver. It is connected to the input port of the unit.

  The invention according to claim 7 is the optical communication network system according to claim 2, wherein the optical receiver includes a plurality of optical receivers, a plurality of output ports, and one input port. And an optical separator that outputs an optical signal input from the input port to any one of the plurality of output ports according to its wavelength, and the input port of the optical separator Is connected to the input port of the optical receiver, and the output port of the optical separator is connected to the optical receiver on a one-to-one basis.

  According to an eighth aspect of the present invention, in the optical communication network system according to any of the second to seventh aspects, the wavelength band optical multiplexer or the wavelength band optical separator is formed of a dielectric multilayer film. It is an optical filter.

  According to a ninth aspect of the present invention, there is provided the optical communication network system according to any of the second to seventh aspects, wherein the wavelength band optical multiplexer or the wavelength band optical separator is an optical fiber. It is characterized by being.

  According to a tenth aspect of the present invention, there is provided the optical communication network system according to any one of the second to seventh aspects, wherein the wavelength band optical multiplexer or the wavelength band optical separator is a planar waveguide. It is a coupler.

As described above, according to the invention described in claim 1, in the optical communication network system using wavelength routing that establishes communication between a plurality of communication nodes and communication between these communication nodes by path control based on the wavelength of the optical signal, Using a wavelength band routing device that connects the input port and output port according to the wavelength band to which the optical signal belongs, and using multiple optical signals with different wavelengths within one wavelength band, the optical path between communication nodes Expansion becomes possible.
In addition, since it is very difficult to add an optical path in the conventional method using an arrayed waveguide diffraction grating as a wavelength routing device, it is possible to expand communication capacity in an optical communication network using wavelength routing by using the present invention. It is possible to dramatically improve the performance and flexibility.

According to the second aspect of the present invention, when an optical signal having a wavelength belonging to the wavelength band λB _m is transmitted from a predetermined communication node, for example, the optical signal is transmitted through the optical transmission line, and the wavelength band routing device To the input port of the wavelength path controller and output from the predetermined output port according to the wavelength band to which the optical signal belongs.
The optical signal output from the output port of the wavelength band routing device is transmitted through the optical transmission path and reaches the communication node.
In this way, data can be transferred from one communication node to another by changing the wavelength of the optical signal transmitted from the communication node.

  Since the conventional wavelength routing apparatus is composed of one arrayed waveguide grating, it is difficult to increase the communication band by providing a plurality of optical paths between communication nodes. According to the invention described in the above, since the wavelength band routing device that connects the input port and the output port according to the wavelength band to which the optical signal belongs is used, a plurality of different wavelengths belonging to the same wavelength band are used between the communication nodes. Since a plurality of optical paths can be provided using optical signals, the communication capacity can be easily increased.

  According to the third aspect of the invention, the optical signal input to one input port is output to different output ports according to the wavelength band, and the wavelength of the light output from one output port Wavelength band routing with different bandwidths for each input port can be performed.

  Further, according to the inventions of claims 4 and 5, it becomes possible to simultaneously transmit a plurality of optical signals having different wavelengths within a certain wavelength band from one optical transmission unit, whereby light between communication nodes can be transmitted. You can increase the number of passes.

  Further, according to the inventions of claims 6 and 7, it becomes possible to simultaneously receive a plurality of optical signals having different wavelengths within a certain wavelength band by one optical receiving unit, whereby light between communication nodes can be received. You can increase the number of passes.

  Moreover, according to the invention of Claim 8, 9, and 10, the effect similar to the invention of any one of Claims 2 thru | or 7 is acquired.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, the number N of device input ports and device output ports of the wavelength routing device in the optical communication network system of the present invention has been described as an example, but the present invention is not limited to this. , N may be an integer of 2 or more.

FIG. 1 is a configuration diagram showing an optical communication network system according to the first embodiment of the present invention. In FIG. 1, reference numerals 200-1 to 200-3 are communication nodes, 210 is a wavelength band routing device, 220-1 to 220-3 and 230-1 to 230-3 are communication nodes 200-1 to 200-3 and wavelength bands. An optical transmission line (optical fiber) connecting the routing device 210.
In addition, the wavelength band routing device 210 includes three device input ports 210-11 to 210-13 and three device output ports 210-21 to 210-23.

Next, components constituting the wavelength band routing device 210 will be described in detail.
As shown in FIG. 2, the wavelength band routing device 210 includes three wavelength band optical separators 310 (310-1 to 310-3) and three wavelength band optical multiplexers 320 (320-1 to 320-3). It is comprised by.
As shown in FIG. 3, the wavelength band optical separator 310 has one input port 311 and three output ports 312-1 to 312-3, and an nth (n = 1, 2, 3) output port 312. light wavelength output belonging to the wavelength band B _{n (=} central wavelength .lambda.B _n ± wavelength bandwidth [Delta] [lambda] _n is from -n.
In this embodiment, a wavelength band optical separator 310 using a dielectric multilayer filter is used, and the wavelength bands are λB ₁ = 1510 nm, λB ₂ = 1530 nm, λB ₃ = 1550 nm, and Δλ ₁ = Δλ based on the CWDM standard. ₂ = Δλ ₃ = 9 nm.

As shown in FIG. 4, the wavelength band optical multiplexer 320 has three input ports 321-1 to 321-3 and one output port 322, and an nth (n = 1, 2, 3) input port 312. -n receives light of a wavelength belonging to the wavelength band λB _n ± wavelength bandwidth Δλ _n and combines the optical signals input to these three input ports 321-1 to 321-3 from the output port 322. Output.
In this embodiment, a wavelength band optical multiplexer 320 utilizing a dielectric multilayer filter is used, and the wavelength bands are λB ₁ = 1510 nm, λB ₂ = 1530 nm, λB ₃ = 1550 nm, and Δλ ₁ = Δλ based on the CWDM standard. ₂ = Δλ ₃ = 9 nm.
As the wavelength band optical multiplexer, an optical coupler configured using an optical waveguide or an optical fiber that outputs optical signals input from a plurality of input ports from one output port regardless of the wavelength of light is used. May be.

  In the wavelength band routing device 210, as shown in FIG. 2, the output port 312-1 of the first wavelength band optical separator 310-1 is connected to the input port 321-1 of the first wavelength band optical multiplexer 320-1. The output port 312-2 of the one wavelength band optical separator 310-1 is connected to the input port 321-1 of the second wavelength band optical multiplexer 320-2, and the output port 312-3 of the first wavelength band optical separator 310-1. Is connected to the input port 321-1 of the third wavelength band optical multiplexer 320-3, and the output port 312-1 of the second wavelength band optical separator 310-2 is the input of the third wavelength band optical multiplexer 320-3 The output port 312-2 of the second wavelength band optical separator 310-2 is connected to the port 321-2, the input port 321-2 of the first wavelength band optical multiplexer 320-1 is connected to the second wavelength band optical separator 310-. 2 is connected to the input port 321-2 of the second wavelength band optical multiplexer 320-2, and the output port 312-1 of the third wavelength band optical separator 310-3 is connected to the second wavelength band optical multiplexer 320-2. The output of the third wavelength band optical separator 310-3 is connected to the input port 321-3 of the waver 320-2. The power port 312-2 is connected to the input port 321-3 of the third wavelength band optical multiplexer 320-3, and the output port 312-3 of the third wavelength band optical separator 310-3 is connected to the third wavelength band optical multiplexer 320-. It is connected to 3 input ports 321-3.

The input port of the nth wavelength band optical separator is connected to the nth input port of the wavelength band routing apparatus, and the output port of the nth wavelength band optical multiplexer is connected to the nth output port of the wavelength band routing apparatus. Has been.
When the configuration as described above is used, the input / output relationship of the wavelength bands of the three input ports and the three output ports of the wavelength band routing device is as shown in FIG. 5, and the wavelength band routing function is realized.
Note that the configuration of the wavelength band routing device is not limited to the above, and for example, an arrayed waveguide diffraction grating having a similar wavelength routing function may be used.

Next, the configuration of each of the communication nodes 200-1 to 200-3 will be described. FIG. 6 is a diagram showing the configuration of the communication node 200-1. 220 is an optical transmission path for guiding the optical signal output from the communication node 200-1 to the wavelength band routing apparatus 210, and 230 is an optical transmission path for guiding the optical signal output from the wavelength band routing apparatus to the communication node 200-1. .
The communication node 200-1 includes a wavelength band optical multiplexer 240 having three input ports and one output port, a wavelength band optical separator 270 having one input port and three output ports, and three optical transmission units. 261 to 263 and three optical receiving units 291 to 293 are provided.

The wavelength band optical multiplexer 240 and the wavelength band optical separator 270 have functions similar to those of the wavelength band optical multiplexer 320 shown in FIG. 4 and the wavelength band optical separator 310 shown in FIG. For example, it is configured using a dielectric multilayer filter, an optical coupler configured with an optical fiber, or an optical coupler configured with a planar optical waveguide.
The optical transmission line 220 is connected to the output port 240-21 of the wavelength band optical multiplexer 240, and the nth (n = 1, 2, 3) input port 240-1n is output from the nth optical transmitter 26n. An optical signal is input.

The nth optical transmitter 26n is an optical transmitter of the wavelength band Bn, and includes one optical transmitter 260-n that transmits an optical signal of the wavelength λn belonging to the wavelength band Bn.
The optical transmission line 230 is connected to the input port 270-11 of the wavelength band optical separator 270, and the optical signal output from the nth output port 270-1n is input to the nth optical receiver 29n.
The n-th optical receiver includes one optical receiver 290-n that can receive an optical signal having a wavelength belonging to the wavelength band Bn.

FIG. 7 is a diagram illustrating a configuration of the communication node 200-2. Since only the structure of the first optical transmission unit 261 is different from the communication node 200-1, only the structure of the first optical transmission unit 261 will be described below, and the other description will be omitted.
The first optical transmission unit 261 of the communication node 200-2 is an optical transmission unit of the wavelength band B1, and includes an optical multiplexer 250 having three input ports 250-11 to 250-13 and one output port 250-21, Three optical transmitters 260-11 to 260-13 connected one-to-one to the input ports 250-11 to 250-13 are provided. Each of the optical transmitters 260-11 to 260-13 transmits optical signals having wavelengths λ11, λ12, and λ13 in the order of description. The values of the wavelengths λ11, λ12, and λ13 are all different and all belong to the wavelength band B1.

FIG. 8 is a diagram illustrating a configuration of the communication node 200-3. Since only the structure of the first optical receiving unit 291 is different from the communication node 200-1, only the structure of the first optical receiving unit will be described below, and the other description will be omitted.
The first optical receiver 291 of the communication node 200-3 includes an optical demultiplexer 280 having one input port 280-11 and three output ports 280-21 to 280-23, and one to one for each output port. Three connected optical receivers 290-11 to 290-13 are provided.

The optical demultiplexer 280 is designed for wavelengths whose wavelength demultiplexing characteristics belong to the wavelength band B1, and when optical signals of wavelengths λ11, λ12, and λ13 are input to the input port 280-11, the nth An optical signal having a wavelength λ1n is output to the output port 280-2n. Each of the three optical receivers converts the input optical signal into an electrical signal and outputs it as a data signal.
As the optical transmitters 270-01 to 270-12, for example, a distributed feedback semiconductor laser can be used.

Next, the operation of the optical communication network system according to the first embodiment of the present invention will be described. Here, as an example, a case where the communication node 200-2 performs data communication with the communication node 200-3 will be described.
In the communication node 200-2, the optical signal having the wavelength λ1p transmitted from the optical transmitter 260-1p (p = 1, 2, 3) of the optical transmitter 261 having the optical transmitter that transmits the optical signal in the wavelength band B1. S23-p is output to the optical transmission line 220 via the optical multiplexer 250 and the wavelength band optical multiplexer 240.
Further, the optical signal S23-p is transmitted through the optical transmission line 220-2 and input to the input port 210-12 of the wavelength band routing device 210.

From the relationship between the input / output port of the wavelength band routing device shown in FIG. 5 and the wavelength band to which the optical signal belongs, the optical signal S23-p input from the input port 210-12 to the wavelength band routing device 210 is output from the output port 210-23. Output from.
The optical signal S23-p output from the output port 210-23 of the wavelength band routing device 210 is transmitted through the optical transmission line 230-3 and is input to the input port 270-11 of the wavelength band optical separator 270 of the communication node 200-3. Reach.

Since the optical signal S23-p belongs to the wavelength band B1, it is output from the output port 270-21 of the wavelength band optical separator 270 of the communication node 200-3, and is input to the optical demultiplexer 280. It is output from the output port 280-1p and received by the optical receiver 290-1p.
In this way, when data is transmitted from the communication node 200-2 to the communication node 200-3, the data is transmitted from the optical transmitter 260-1p in the optical transmission unit 261 in the wavelength band B1 of the communication node 200-2. This can be done by using an optical signal S23-p having a wavelength λ1p. That is, in this embodiment, when transmitting data from the communication node 200-2 to the communication node 200-3, three optical paths S23-1, S23-2, and S23-3 can be used.

In the present embodiment, the wavelength of the optical signal transmitted from the optical transmission unit 261 of the communication node 200-2 is
Based on the DWDM standard with an interval of 100 GHz, λ1 = 1509.53 nm, λ2 = 1510.29 nm, and λ3 = 11511.05 nm.
In this embodiment, three optical paths for transmitting data from the communication node 200-2 to the communication node 200-3 are added. However, the present invention is not limited to this, and the optical transmission unit and the optical reception are not limited thereto. It goes without saying that it is possible to increase the number of optical paths between arbitrary communication nodes to an arbitrary number of two or more by using the same configuration for each unit.

In the present embodiment, a DWDM standard having a wavelength interval of 100 GHz is used, but a standard of 25 GHz or 50 GHz interval can be used similarly.
In this embodiment, the wavelength band routing is performed in the wavelength band based on the CWDM standard, and the wavelength multiplexed optical signal having the wavelength interval based on the DWDM standard is transmitted in one wavelength band. The wavelength band and wavelength interval defined in the CWDM or DWDM standard may not be applied.

As described above, according to the embodiment of the present invention, in an optical communication network system using wavelength routing that establishes communication between a plurality of communication nodes and communication between these communication nodes by path control based on the wavelength of the optical signal, Using a wavelength band routing device that connects input and output ports according to the wavelength band to which it belongs, and using multiple optical signals with different wavelengths within one wavelength band, it is possible to add optical paths between communication nodes. become.
In addition, since it is very difficult to add an optical path in the conventional method using an arrayed waveguide diffraction grating as a wavelength routing device, it is possible to expand communication capacity in an optical communication network using wavelength routing by using the present invention. It is possible to dramatically improve the performance and flexibility.

The figure which shows the whole structure of the optical communication system which concerns on embodiment of this invention. The figure which shows the structure of the wavelength band routing apparatus which concerns on embodiment of this invention. The figure explaining the wavelength band optical separator of the optical communication system which concerns on embodiment of this invention. The figure explaining the wavelength band optical multiplexer of the optical communication system which concerns on embodiment of this invention. The figure which shows the relationship between the input / output port of the wavelength band routing apparatus of the optical communication system which concerns on embodiment of this invention, and a wavelength band. The figure which shows the structural example of the communication node in the optical communication system which concerns on embodiment of this invention. The figure which shows the other structural example of the communication node in the optical communication system which concerns on embodiment of this invention. The figure which shows the further another structural example of the communication node in the optical communication system which concerns on embodiment of this invention. The figure which shows the optical communication network system based on the wavelength path routing implement | achieved using the arrayed-waveguide diffraction grating of a prior art example. The figure which shows the relationship between the input-output port of an arrayed-waveguide diffraction grating in a prior art example, and a wavelength.

Explanation of symbols

100-1 to 100-4 ... communication node, 110 ... 4 × 4 array waveguide diffraction grating, 120-1 to 120-4 ... upstream optical transmission path, 130-1 to 130-4 ... downstream optical transmission path, 140-1 to 140-4 ... 4 × 4 array waveguide diffraction grating 110 input port, 150-1 to 150-4 ... 4 × 4 array waveguide diffraction grating 110 output port, 200-1 to 200-3 ... Communication node, 210 ... wavelength band routing device, 210-11 to 210-13 ... input port of wavelength band routing device, 210-21 to 210-23 ... output port of wavelength band routing device, 220,220-1 to 220-3 ... Optical transmission line, 230, 230-1 to 230-3 ... Optical transmission line, 240 ... Wavelength band optical multiplexer, 240-11 to 240-13 ... Input port of wavelength band optical multiplexer 240, 240-21 ... Wavelength band optical multiplexing 240 output port, 250 ... optical multiplexer, 250-11 to 250-13 ... input port of optical multiplexer 250, 250-21 ... output port of optical multiplexer 250,260-1 to 260-3, 260- 11 to 260-13 ... optical transmitter, 261 to 263 ... optical transmitter, 270 ... wavelength band optical separator, 270-11 ... wave Long-band optical separator 270 input port, 270-21 to 270-23 ... wavelength band optical separator 270 output port, 280 ... optical separator, 280-11 ... optical multiplexer 280 input port, 280-21- 280-23: Output port of optical multiplexer 280, 290-1 to 290-3, 290-11 to 290-13 ... Optical receiver,
310,310-1 to 310-3 ... wavelength band light separator, 311 ... input port of wavelength band light separator 310, 312-1 to 312-3 ... output port of wavelength band light separator 310,320,320-1 to 320- 3 ... Wavelength band optical multiplexer, 321-1 to 321-3 ... Input port of wavelength band optical multiplexer 320, 322 ... Output port of wavelength band optical multiplexer

Claims (10)

A communication path is formed by connecting a plurality of communication nodes, a wavelength band routing apparatus that routes a communication path between the communication nodes based on a wavelength band to which an optical signal belongs, and the communication node and the wavelength band routing apparatus. In an optical communication network system comprising an optical transmission line,
The wavelength band routing device is:
N (N is an integer of 2 or more) input ports connected one-to-one to the communication node via the optical transmission path;
N output ports connected to the communication node one-to-one via the optical transmission path,
Optical signals input to one input port are output to different output ports according to the wavelength band to which the wavelength of the optical signal belongs, and optical signals belonging to the same wavelength band input from different input ports are different. An optical communication network system characterized by outputting from an output port. A communication path is formed by connecting a plurality of communication nodes, a wavelength band routing apparatus that routes a communication path between the communication nodes based on a wavelength band to which an optical signal belongs, and the communication node and the wavelength band routing apparatus. In an optical communication network system comprising an optical transmission line,
The wavelength band routing device is:
N (N is an integer of 2 or more) input ports connected one-to-one to the communication node via the optical transmission path;
N output ports connected to the communication node one-to-one via the optical transmission path,
An optical signal input to one input port is converted into a wavelength band B _m to which the wavelength of the optical signal belongs (wavelength band B _m = center wavelength λB _m ± wavelength bandwidth Δλ _m , where λB _m + Δλ _m ≦ λB _{m + 1} -Δλ _{m + 1} , 1 ≦ m ≦ N, where m is an integer), and output to different output ports, and optical signals belonging to the same wavelength band input from different input ports are output from different output ports. ,
The communication node is
K (K is an integer of 2 or more) input ports and one output port. Each of the K input ports IP [1], IP [2], IP [3], ... IP [K] is A wavelength band B ₁ , a wavelength band B ₂ , a wavelength band B ₃ ,..., A wavelength band B _K , a K × 1 wavelength band optical multiplexer that outputs optical signals having wavelengths belonging to each wavelength band to the output port;
Each of the input ports IP [1], IP [2], IP [3],... IP [K] of the K × 1 wavelength band optical multiplexer. An integer, 1 ≦ k ≦ K) port, and for the connected input port IP [k], a wavelength multiplexed optical signal consisting of a plurality of optical signals having different wavelengths belonging to the wavelength band B _k or At least one optical transmitter that transmits an optical signal of a single wavelength belonging to the wavelength band B _k ;
K (K is an integer greater than or equal to 2) output ports and one input port, and the one input port has wavelength band B ₁ , wavelength band B ₂ , wavelength band B _{3 ,.} A 1 × K wavelength band optical separator that outputs optical signals of wavelengths belonging to each wavelength band to the K output ports OP [1], OP [2], OP [3],. ,
Each of the output ports OP [1], OP [2], OP [3],... OP [K] of the 1 × K wavelength band optical separator (where k is an integer, 1 ≦ k ≦ K) wavelength-division-multiplexed optical signal consisting of a plurality of optical signals having different wavelengths belonging to the wavelength band B _k and transmitted from the connected input port OP [k] on a one-to-one basis. And at least one optical receiver capable of receiving
The output port of the K × 1 wavelength band optical multiplexer is connected to the input port of the wavelength band routing device in a one-to-one relationship via an optical waveguide;
The optical communication network system, wherein the input port of the 1 × K wavelength band optical separator is connected to the output port of the wavelength routing device in a one-to-one relationship via an optical waveguide. The wavelength band routing device is:
J (where J is an integer greater than or equal to N) output ports and one input port, and the one input port is connected to one of the input ports of the wavelength band routing device on a one-to-one basis. Wavelength bands B ₁ , wavelength bands B ₂ , wavelength bands B ₃ ,..., Wavelength bands B _J that are input from the input port are transmitted as optical signals of wavelengths belonging to the wavelength bands B _J according to the wavelength bands to which the signals belong. N 1 × J wavelength band optical separators that output to one of the output ports;
Each of the N input ports of the wavelength band routing device has one output port and J input ports, and the output port is connected to one of the output ports of the wavelength band routing device in a one-to-one relationship. Wavelength band B ₁ , wavelength band B ₂ , wavelength band B ₃ ,..., Wavelength band B _J of optical signals having wavelengths belonging to each wavelength band are output to the one output port N J × One wavelength band optical multiplexer,
Each output port of the 1 × J wavelength band optical separator is connected to one of the input ports of the different J × 1 wavelength band optical multiplexer from one port to the J × 1 wavelength band optical multiplexer. 3. The optical communication network system according to claim 2, wherein the optical communication network system is connected in a one-to-one relationship such that there is no duplication in the wavelength bands to which the input optical signals belong. The optical transmitter is
4. The optical communication network system according to claim 2, further comprising one optical transmitter, wherein the optical transmitter is connected to an output port of the optical transmitter. 5. The optical transmitter is
A plurality of optical transmitters having different wavelengths of optical signals to be transmitted;
It has a plurality of input ports and one output port, and includes an optical multiplexer that outputs the optical signal input from the input port from the output port,
The output port of the said optical multiplexer is connected to the output port of the said optical transmission part, and the input port of the said optical multiplexer is connected to the said optical transmitter 1: 1, The Claim 2 or 3 characterized by the above-mentioned. An optical communication network system according to any one of the above. The optical receiver is
4. The optical communication network system according to claim 2, further comprising one optical receiver, wherein the optical receiver is connected to an input port of the optical receiver. The optical receiver is
Multiple optical receivers;
It has a plurality of output ports and one input port, and includes an optical separator that outputs an optical signal input from the input port to any one of the plurality of output ports according to the wavelength. ,
The input port of the optical separator is connected to the input port of the optical receiver, and the output port of the optical separator is connected to the optical receiver on a one-to-one basis. 4. The optical communication network system according to any one of 3.   8. The optical communication network system according to claim 2, wherein the wavelength band optical multiplexer or the wavelength band optical separator is an optical filter configured with a dielectric multilayer film.   8. The optical communication network system according to claim 2, wherein the wavelength band optical multiplexer or the wavelength band optical separator is an optical coupler configured with an optical fiber. 8. The optical communication network system according to claim 2, wherein the wavelength band optical multiplexer or the wavelength band optical separator is an optical coupler configured with a planar waveguide.

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