JP4355282B2 - Wavelength routing device - Google Patents

Description

  The present invention relates to a wavelength routing device for configuring an optical network system capable of arbitrarily connecting a plurality of communication nodes.

  In recent years, with the widespread use of broadband services and the increased use of information exchange using the corporate Internet, communication traffic is constantly increasing, and the demand for increasing the capacity and speeding up of communication networks is constant.

  Wavelength division multiplexing (WDM) communication technology has greatly increased the transmission capacity per optical fiber and realized a large capacity of information transmitted between two points. In order to apply transmission using the WDM technology between many communication nodes, a function for exchanging and processing a large number of optical signals multiplexed at the junction (branch point) of the transmission path is required. However, with the increase in transmission speed and capacity, the amount of path control processing by electrical signal processing in the communication node becomes enormous, and it is considered that the limit will be reached in the near future.

  As a means for solving the above-described problems, a technique for performing routing without changing an optical signal into an electrical signal and performing electrical routing has been actively researched. Wavelength routing that performs routing according to the wavelength of an optical signal is a typical technique. An arrayed waveguide diffraction grating is a key optical component for realizing wavelength routing. The arrayed waveguide grating is an optical component having a plurality of input ports and a plurality of output ports, and has a characteristic that the output port changes according to the wavelength of an optical signal input to the input port.

  FIG. 1 is a diagram illustrating an example of an optical network system that performs wavelength routing using an arrayed waveguide grating. (For example, it is described in Non-Patent Document 1).

  The optical network system shown in FIG. 1 has four communication nodes 10-1 to 10-4, four input ports 14-1 to 14-4, and four output ports 15-1 to 15-4. It is composed of a 4 × 4 arrayed waveguide diffraction grating 11. Optical signals transmitted from the communication nodes 10-1 to 10-4 pass through the upstream optical waveguides 12-1 to 12-4, respectively, and input ports 14-1 to 14- of the 4 × 4 arrayed waveguide diffraction grating 11. 4 is input. The optical signals output from the output ports 15-1 to 15-4 of the 4 × 4 arrayed waveguide grating 11 pass through the downstream optical waveguides 13-1 to 13-4, and the communication nodes 10-1 to 10-10. -4.

  FIG. 2 is a diagram showing how each input port and each output port of the 4 × 4 arrayed waveguide diffraction grating are connected depending on the wavelength. FIG. 2A shows a case of a 4 × 4 arrayed waveguide diffraction grating having wavelength recurring properties, and FIG. 2B shows a case of not having wavelength revolving properties.

  For example, in FIG. 2A, when an optical signal having a wavelength of λ3 is input to the first input port of the 4 × 4 array waveguide diffraction grating, the optical signal of λ3 is the first of the 4 × 4 array waveguide diffraction grating. Output from 3 output ports. Therefore, considering the optical network in FIG. 1, when the communication node 10-1 transmits an optical signal having the wavelength λ3, the optical signal having the wavelength λ3 passes through the optical waveguide 12-1 and is input to the 4 × 4 array waveguide diffraction grating 11. The optical signal of λ3 is input to the port 14-1 and output from the output port 15-3 of the 4 × 4 arrayed waveguide diffraction grating 11 by wavelength routing. Thereafter, the optical signal of λ3 reaches the communication node 10-3 through the optical waveguide 13-3.

  In this way, by using the wavelength routing function of the arrayed waveguide grating, routing is performed based on the wavelength of the optical signal and communication between communication nodes is possible without converting the optical signal into an electrical signal.

  As a light source for transmitting an optical signal installed in a communication node, there are a wavelength fixed light source in which the wavelength of an output optical signal is fixed, and a wavelength variable light source that can change the wavelength of an output optical signal.

  In the optical network system that performs wavelength routing shown in FIG. 1, in the case of a system in which each communication node does not communicate with a plurality of communication nodes at the same time and the communication partner changes irregularly, all wavelengths used for the communication node It is not cost effective to implement a fixed wavelength light source. That is, the use of a fixed wavelength light source is cost effective when the communication partner is always determined. On the other hand, when the communication partner changes depending on the situation, the use of a wavelength tunable light source is effective in terms of cost.

  In a communication node that uses a wavelength tunable light source as a light source for transmitting an optical signal, wavelength tunable light source control means for controlling the output light wavelength of the wavelength tunable light source and on / off of the light output is provided. The wavelength tunable light source control means exchanges information regarding wavelength tunable light source control between the wavelength tunable light source control means provided in each communication node, whereby the optical signal is transmitted to the target communication node by the wavelength routing device 11. The wavelength tunable light source is controlled so as to reach. Hereinafter, wavelength routing of the optical network system will be described in more detail.

  FIG. 3 is a diagram illustrating an example of an optical network system that performs wavelength routing using a wavelength tunable light source as an optical signal transmission light source of each communication node. For example, Patent Document 1 describes details. In FIG. 3, the communication nodes 200-1 to 200-4 each include a wavelength variable light source built-in optical signal transmitter 210, a wavelength variable light source control means 220, and an optical signal receiver 230. However, in FIG. 3, only the communication node 200-1 is shown, and the communication nodes 200-2 to 200-4 are omitted.

  The wavelength variable light source control means 220 of each of the communication nodes 200-1 to 200-4 are connected to each other by a control signal line 270 that exchanges information regarding wavelength variable light source control. In FIG. 3, the control signal line 270 is schematically indicated by a dotted line. Each of the wavelength variable light source built-in optical signal transmitters 210 is connected to the input ports 251-1 to 251-4 of the 4 × 4 wavelength circular array waveguide diffraction grating 250 by optical waveguides 280-1 to 280-4, respectively. Has been. Further, the output ports 252-1 to 252-4 of the 4 × 4 wavelength looping array waveguide diffraction grating 250 receive optical signals of the communication nodes 200-1 to 200-4 through the optical waveguides 290-1 to 290-4. Are connected to the respective units 230.

  That is, in FIG. 3, the communication node 200-1 is connected to the first input port 251-1 and the first output port 252-1 of the 4 × 4 wavelength recurring arrayed waveguide grating 250, and the communication node 200-2 is 4 × 4. The communication node 200-3 is connected to the second input port 251-2 and the second output port 252-2 of the wavelength-circulating arrayed waveguide grating 250, and the communication node 200-3 is the third input port of the 4 × 4 wavelength-circulating arrayed waveguide grating 250. 251-3 and the third output port 252-3, the communication node 200-4 is connected to the fourth input port 251-4 and the fourth output port 252-4 of the 4 × 4 wavelength repetitive arrayed waveguide grating 250, respectively. Has been. The 4 × 4 wavelength circular array waveguide diffraction grating 250 has a relationship between the input / output port and the wavelength as shown in FIG.

  FIG. 4 shows an example of an optical routing operation when the optical network system having the configuration shown in FIG. 3 is operating normally. From communication node 200-1 to communication node 200-2, from communication node 200-2 to communication node 200-3, from communication node 200-3 to communication node 200-4, and from communication node 200-4 to communication node An optical path is established to 200-1, and communication is performed. At this time, the wavelength variable light source output wavelength of the communication node 200-1 is λ2, the wavelength variable light source output wavelength of the communication node 200-2 is λ4, the wavelength variable light source output wavelength of the communication node 200-3 is λ2, and the communication node 200-4. The wavelength tunable light source output wavelength is λ4.

JP 2004-088705 A K. Kato, A. Okada, Y. Sakai, K. Noguchi, T. Sakamoto, S. Suzuki, A. Takahara, S. Kamei, A. Kaneko, M. Matsuoka, “32 × 32 full-mesh (1024path) wavelength-routing WDM network based on uniform-loss cyclic-frequency arrayed-waveguide grating, ”Electronics Letters, 2000/7/20, Volume 36, Issue 15, 1294-1296

  However, when a situation occurs in which the wavelength of the wavelength tunable light source is not normally controlled due to an abnormality in the wavelength tunable light source control means 220 of the communication node or a communication path failure of the control signal 270, the network operation is caused by interference between optical signals. There was a problem of causing trouble.

  For example, from the normal operation state shown in FIG. 4, from the communication node 200-1 to the communication node 200-4, from the communication node 200-2 to the communication node 200-3, and from the communication node 200-3 to the communication node 200. -2 and from the communication node 200-4 to the communication node 200-1, consider the case where the routing path is changed so as to establish an optical path and perform communication.

  When the routing path is changed, the output optical signal wavelength from the wavelength variable light source built-in optical signal transmitter 210 of the communication node 200-1 is originally λ4, and the wavelength variable light source built-in optical signal transmission of the communication node 200-2 is transmitted. The output optical signal wavelength from the transmitter 210 is λ4, the output optical signal wavelength from the tunable light source built-in optical signal transmitter 210 of the communication node 200-3 is λ4, and the tunable light source built-in optical signal transmission of the communication node 200-4 is transmitted. The output optical signal wavelength from the device 210 must be controlled to λ4.

  FIG. 5 shows an example of an optical routing operation when an abnormality occurs in the optical network system shown in FIG. As described above, the wavelength of the output optical signal from the wavelength-tunable light source built-in optical signal transmitter 210 is not normally controlled due to an abnormality of the wavelength-tunable light source control unit 220 or a communication path failure of the control signal line 270. . For example, consider a case where the output optical signal wavelength from the optical signal transmitter 210 with a built-in variable wavelength light source of the communication node 200-3 is not switched to λ4, but an optical signal having a wavelength of λ2 is output. In this case, the optical signal from the communication node 200-3 that should be routed to the second output port 252-2 is routed to the fourth output port 252-4 as shown in FIG. Interfering with the optical signal from 1. As a result, although the output optical wavelength of the wavelength tunable light source of the communication node 200-1 has been switched normally, there is interference with the optical signal from the communication node 200-3. The optical signal is not normally received by the communication node 200-4.

  As described above, in an optical network system in which a communication node performs wavelength routing using a wavelength tunable light source as a light source for transmitting an optical signal, it operates normally due to a malfunction of output light wavelength control of the wavelength tunable light source installed in the communication node. Interfering with communication between other communication nodes. Therefore, for the normal network operation of the optical network system, it is necessary to prevent the above-described communication interference.

  In addition, in the optical network system shown in FIG. 3, when a certain communication node transmits the same data to a plurality of communication nodes, so-called multicasting, the communication node performing the multicast transmits the same data at different times. Had to be sent multiple times to multiple communication nodes. This is because each communication node has only one optical signal transmitter 210 with a built-in tunable light source, and the optical signal transmitter with a built-in tunable light source 210 can simultaneously transmit a plurality of optical signals with different wavelengths. This is because it cannot be done.

  The above problem will be described using the optical network system shown in FIG. Consider a case where communication node 100-1 performs multicast to communication node 100-2 and communication node 100-4. First, the communication node 100-1 transmits an optical signal having a wavelength λ2 toward the communication node 100-2. After completing the transmission, the communication node 100-1 transmits an optical signal having the wavelength λ4 toward the communication node 100-4. For example, when the optical path length from the communication node 100-1 to the communication node 100-2 is equal to the optical path length from the communication node 100-1 to the communication node 100-4, at least the transmission time of the optical signal (the length of the optical signal) Therefore, there is a difference between the time when the optical signal reaches the communication node 200-2 and the time when it reaches the communication node 200-4. Further, the communication node 100-1 spends time for multicast transmission at least twice as long as the transmission time of the optical signal (length of the optical signal).

  For example, when performing computer clustering that connects a large number of computers using an optical network system, the occurrence of a time difference in the arrival time of the optical signal described above in multicast transmission and a longer transmission time are the performance of computer clustering. It becomes a serious problem that leads to deterioration. More specifically, when a large number of computers are connected by an optical network to perform high-speed calculation, multicast transmission is necessary for one computer to issue a calculation instruction command to many other computers. As described above, the arrival time variation of the optical signal and the longer transmission time limit the performance of high-speed calculation using the optical network system, which places a heavy burden on a specific computer, that is, a specific transmission node. .

  As described above, in the optical network system shown in FIG. 3, when multicasting is performed, there is a problem that the time for an optical signal to reach a communication node that receives the optical signal varies, and a load is applied to the transmission node. There was a problem.

  The present invention has been made in consideration of the above-described circumstances, and is generated due to malfunction of wavelength setting control of a wavelength tunable light source in an optical network system based on wavelength routing and capable of arbitrarily connecting a plurality of communication nodes. An object of the present invention is to provide a wavelength routing device that can prevent the above-described network failure and can realize an optical network system having excellent reliability.

  It is another object of the present invention to provide a wavelength routing device capable of suppressing variations in time when an optical signal reaches a reception node and reducing a load on a transmission node by providing the wavelength routing device with a multicast function. And

  In order to achieve such an object, the present invention provides a wavelength routing apparatus that constitutes an optical network system capable of arbitrarily connecting N communication nodes. An optical output port connected to the input port of the optical modulator via the first optical waveguide; an apparatus input port connected to the output port of the optical modulator of the communication node via the second optical waveguide; A connection control signal for controlling a communication connection between the communication nodes between a device output port connected to the optical signal receiver of the communication node via a third optical waveguide and a control unit of the communication node. A control circuit for transmitting and receiving; N wavelength variable light sources whose wavelengths of output light are determined by a light source control signal from the control circuit; the wavelength variable light sources are connected to an input port; and the optical output port is an output port A first N × N arrayed waveguide grating connected to a second N × N arrayed waveguide grating with the device input port connected to an input port and the device output port connected to an output port A wavelength of the output light of the wavelength tunable light source is determined by the connection control signal including transmission destination information emitted by a transmission source communication node, and the output light is modulated by an optical modulator of the transmission source communication node It is characterized by being.

  According to a second aspect of the present invention, there is provided a connection control signal separating means connected between the device input port and an input port of the second N × N arrayed waveguide grating, the device output port, and the first A connection control signal synthesizing unit connected between the output ports of the two N × N arrayed waveguide diffraction gratings, and the connection control signal is transmitted by the second optical waveguide and the third optical waveguide. It is characterized by that.

  According to a third aspect of the present invention, there is provided a wavelength routing device that constitutes an optical network system that can arbitrarily connect N communication nodes, and the communication node includes a one-terminal optical modulator and a first optical waveguide. Communication between the communication nodes between an input / output port to be connected, a device output port connected to the optical signal receiver of the communication node via a second optical waveguide, and a control unit of the communication node A control circuit that transmits and receives a connection control signal for controlling connection; an N number of wavelength tunable light sources whose wavelengths of output light are determined by a light source control signal from the control circuit; and a first that has the wavelength tunable light source connected to an input port N × N array waveguide diffraction grating, and N circulators in which the first N × N array waveguide diffraction grating is connected to a first port and the input / output port is connected to a second port; A third port of the circulator is connected to the input port, and the device output port includes a second N × N array waveguide diffraction grating connected to the output port, and includes transmission destination information emitted by the communication node of the transmission source The wavelength of the output light of the wavelength tunable light source is determined by the connection control signal, and the output light is modulated by a one-terminal optical modulator of the transmission source communication node.

  According to a fourth aspect of the present invention, there is provided a connection control signal separating means connected between the N circulators and an input port of the second N × N array waveguide diffraction grating, the device output port, and the device And a connection control signal synthesizing unit connected between the output port of the second N × N array waveguide diffraction grating and transmitting the connection control signal by the first optical waveguide and the second optical waveguide. It is characterized by doing.

According to a fifth aspect of the present invention, in the wavelength routing apparatus constituting the optical network system capable of arbitrarily connecting N communication nodes, the communication node is connected to the one-terminal optical modulator and the first optical waveguide. Communication between the communication nodes between an input / output port to be connected, a device output port connected to the optical signal receiver of the communication node via a second optical waveguide, and a control unit of the communication node A control circuit for transmitting and receiving a connection control signal for controlling connection; N wavelength tunable light sources whose wavelengths of output light are determined by a light source control signal from the control circuit; and the tunable light source connected to a first port, N circulators whose device output ports are connected to a third port, N circulators whose second port is connected to an input port, and whose input / output ports are connected to an output port And a N arrayed waveguide grating, the connection control signal by Sadamari wavelength of the output light of said variable wavelength light source, a communication wherein the output light of said source node including destination information communication node source emits Modulated by a one-terminal optical modulator.

  According to a sixth aspect of the present invention, there is provided a connection control signal separating means connected between the input / output port and the output port of the N × N arrayed waveguide grating, and between the device output port and the circulator. And a connection control signal synthesizing unit connected to the terminal, wherein the connection control signal is transmitted by the first optical waveguide and the second optical waveguide.

  According to a seventh aspect of the present invention, the first N × N array waveguide diffraction grating, the second N × N array waveguide diffraction grating, and the N × N array waveguide diffraction grating have wavelength revolving properties. It is characterized by that.

  According to the present invention, in an optical network system in which a plurality of communication nodes can be arbitrarily connected, it is possible to prevent collision of optical signals in an optical signal receiver and to realize an optical network system excellent in reliability. Become.

  Furthermore, by providing the wavelength routing device with a multicast function, it is possible to suppress variations in the time at which the optical signal reaches the reception node and to reduce the load on the transmission node.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In the following embodiments, the number N of device input ports and device output ports of the wavelength routing device according to the present invention is described as an example, but the case is not limited thereto. N may be an integer of 2 or more.

(Embodiment 1)
FIG. 6 is a diagram showing an overall configuration of an optical network system including the wavelength routing device according to the first embodiment of the present invention.

  6, the optical network system includes communication nodes 1000-1 to 1000-4, a wavelength routing device 1010, and optical waveguides 1020-1 to 1020 that connect the wavelength routing device 1010 and the communication nodes 1000-1 to 1000-4. -4, optical waveguides 1030-1 to 1030-4 connecting the communication nodes 1000-1 to 1000-4 and the wavelength routing device 1010, and connecting the wavelength routing device 1010 and the communication nodes 1000-1 to 1000-4 It comprises optical waveguides 1090-1 to 1090-4.

  The wavelength routing device 1010 has optical output ports 4-1 to 4-4, device input ports 5-1 to 5-4, and device output ports 6-1 to 6-4. The optical waveguides 1020-1 to 1020-4 are respectively connected to the optical output ports 4-1 to 4-4, and the optical waveguides 1030-1 to 1030-4 are respectively connected to the device input ports 5-1 to 5-4. 1 to 1090-4 are connected to the wavelength routing device 1010 at the device output ports 6-1 to 6-4, respectively.

  The wavelength routing apparatus 1010 includes wavelength tunable light sources 1340-1 to 1340-4, a first 4 × 4 array waveguide diffraction grating 1350, a second 4 × 4 array waveguide diffraction grating 1050, and a control circuit 1120. Yes. Further, the first 4 × 4 arrayed waveguide diffraction grating 1350 receives input ports 1360-1 to 1360-4 and the output ports 1370-1 to 1370-4, and the second 4 × 4 arrayed waveguide diffraction grating 1050 inputs. Ports 1060-1 to 1060-4 and output ports 1070-1 to 1070-4 are provided.

  The control circuit 1120 always keeps track of which communication node is currently communicating, and possesses information on the communication state as a database.

  The wavelength variable light sources 1340-1 to 1340-4 can change the wavelength of the light output by the light source control signal from the control circuit 1120. The light output from the wavelength tunable light sources 1340-1 to 1340-4 is diffracted from the input port 1360-1 to 1360-4 of the first 4 × 4 array waveguide diffraction grating 1350 by the first 4 × 4 array waveguide diffraction. Input to grid 1350.

  The first 4 × 4 arrayed waveguide diffraction grating 1350 of the present embodiment has a wavelength circulation property, and the relationship between the input / output port and the wavelength is as shown in FIG.

  In accordance with the relationship of FIG. 2A, the light input to the input ports 1360-1 to 1360-4 of the first 4 × 4 array waveguide diffraction grating 1350 is the first 4 × 4 array waveguide diffraction grating 1350. Are output from any one of the output ports 1370-1 to 1370-4.

  The light output from the output ports 1370-1 to 1370-4 of the first 4 × 4 arrayed waveguide diffraction grating 1350 is the optical output ports 4-1 to 4-4 and the optical waveguides 1020-1 to 1020-4, respectively. To reach the communication nodes 1000-1 to 1000-4.

  FIG. 12A is a diagram illustrating a configuration of the communication nodes 1000-1 to 1000-4 in the first embodiment of the present invention.

  In FIG. 12A, the communication nodes 1000-1 to 1000-4 include an optical modulator 2010, a control unit 2020, and an optical signal receiver 2030. The input ports of the optical modulators 2010 of the communication nodes 1000-1 to 1000-4 are the first 4 × 4 via the optical waveguides 1020-1 to 1020-4 and the optical output ports 4-1 to 4-4, respectively. It is connected to output ports 1370-1 to 1370-4 of the arrayed waveguide diffraction grating 1350. The output port of the optical modulator 2010 is the input port 1060-1 of the second 4 × 4 arrayed waveguide grating 1050 via the optical waveguides 1030-1 to 1030-4 and the device input ports 5-1 to 5-4. -1060-4. The optical signal receivers 2030 of the communication nodes 1000-1 to 1000-4 are respectively connected to the second 4 × 4 via the optical waveguides 1090-1 to 1090-4 and the device output ports 6-1 to 6-4. The array waveguide diffraction grating 1050 is connected to output ports 1070-1 to 1070-4.

  The second 4 × 4 arrayed waveguide diffraction grating 1050 of this embodiment has a wavelength circulation property, and the relationship between the input / output port and the wavelength is the relationship shown in FIG. In accordance with the relationship of FIG. 2A, the light input to the second 4 × 4 arrayed waveguide diffraction grating 1050 is output from the output ports 1070-1 to 1070-4 of the second 4 × 4 arrayed waveguide diffraction grating 1050. Is output from either

  The output ports 1070-1 to 1070-4 of the second 4 × 4 arrayed waveguide diffraction grating 1050 are connected to the communication nodes 1000-1 to 1000-4 through the optical waveguides 1090-1 to 1090-4, respectively. Yes.

  The light of the wavelengths λ1, λ2, λ3, and λ4 output from the wavelength tunable light source 1340-1 always passes through any one of the communication nodes 1000- to 1000-4, and then the second 4 × 4 array waveguide diffraction grating 1050 is surely obtained. Output from the first output port 1070-1. Below, it demonstrates in detail using drawing.

  FIG. 13A is a diagram for explaining how light having different wavelengths output from a wavelength tunable light source is routed by the wavelength routing apparatus.

According to the relationship between the input / output port and the wavelength shown in FIG. 2A, the output port from which the light input from the input port 1360-1 of the first 4 × 4 arrayed waveguide grating 1350 is output is: When the wavelengths of light are λ1, λ2, λ3, and λ4, they become output ports 1370-1, 1370-2, 1370-3, and 1370-4 of the first 4 × 4 arrayed waveguide grating 1350, respectively. The output ports 1370-1, 1370-2, 1370-3, 1370-4 of the first 4 × 4 arrayed waveguide grating 1350 are connected to the communication nodes 1000-1, 1000-2, 1000-3, 1000-4, respectively. Via, it is connected to the input ports 1060-1, 1060-2, 1060-3, 1060-4 of the second 4 × 4 arrayed waveguide grating 1050. Accordingly, the light beams having the wavelengths λ1, λ2, λ3, and λ4 are input to the input ports 1060-1, 1060-2, 1060-3, and 1060-4 of the second 4 × 4 arrayed waveguide grating 1050, respectively. According to the relationship between the input / output port and the wavelength shown in FIG. 2A, all of the light beams having the wavelengths λ1, λ2, λ3, and λ4 are the first output port of the second 4 × 4 arrayed waveguide grating 1050. 1070-1 is output. Therefore, as shown in FIG. 13A, the light output from the wavelength tunable light source 1340-1 is always output from the output port 1070-1 of the second 4 × 4 arrayed waveguide diffraction grating 1050.
Similarly, the light output from the wavelength tunable light source 1340-2 is always output from the output port 1070-2 of the second 4 × 4 arrayed waveguide diffraction grating 1050.

  Similarly, the light output from the wavelength tunable light source 1340-3 is always output from the output port 1070-3 of the second 4 × 4 arrayed waveguide grating 1050.

  Similarly, the light output from the wavelength tunable light source 1340-4 is always output from the output port 1070-4 of the second 4 × 4 arrayed waveguide grating 1050.

  That is, the variable wavelength light sources 1340-1 to 1340-4 correspond one-to-one with the optical signal receivers 2030 of the communication nodes 1000-1 to 1000-4 regardless of the wavelength of the output light. Therefore, even if the control of the output light wavelength of the wavelength tunable light sources 1340-1 to 1340-4 occurs, there is no possibility of causing communication interference with communication between other communication nodes.

  Next, the wavelength routing operation of the present invention will be described in more detail.

  For example, consider a case where the communication node 1000-1 transmits to the communication node 1000-2. The control unit 2020 in the communication node 1000-1 transmits a connection request to the communication node 1000-2 to the control circuit 1120 by a connection control signal. The control circuit 1120 determines whether or not the optical signal receiver 2030 of the communication node 1000-2 is free with reference to the owned database. If the optical signal receiver 2030 of the communication node 1000-2 is not available, the control circuit 1120 notifies the communication node 1000-1 that it is not available by a connection control signal. If the optical signal receiver 2030 of the communication node 1000-2 is free, the control circuit 1120 sets the wavelength of the output light of the wavelength tunable light source 1340-2 to λ2.

  The light of wavelength λ2 input from the input port 1360-2 of the first 4 × 4 arrayed waveguide diffraction grating 1350 is output from the output port 1370-1 of the first 4 × 4 arrayed waveguide diffraction grating 1350. . Then, after propagating through the optical waveguide 1020-1, the light of wavelength λ2 is input to the optical modulator 2010 of the communication node 1000-1. After the head of the light of wavelength λ2 passes through the optical modulator 2010, the control unit 2020 of the communication node 1000-1 starts modulation by transmitting the data string to be transmitted to the optical modulator 2010. The modulated light (hereinafter referred to as signal light) propagates through the optical waveguide 1030-1 and is input to the input port 1060-1 of the second 4 × 4 arrayed waveguide grating 1050, and the second 4 It is output from the output port 1070-2 of the × 4 array waveguide diffraction grating 1050. And it is received by the optical signal receiver 2030 of the communication node 1000-2 via the optical waveguide 1090-2.

  As another example of the wavelength routing operation, consider a case where the communication node 1000-1 performs transmission (multicast transmission) to the communication nodes 1000-2 and 1000-3. The control unit 2020 in the communication node 1000-1 transmits a connection control signal including destination information of the communication node that should perform multicast transmission to the control circuit 1120. The control circuit 1120 determines whether or not the optical signal receivers 2030 of the communication node 1000-2 and the communication node 1000-3 are free with reference to the owned database. If it is not available, the control circuit 1120 notifies the communication node 1000-1 that it is not available by a connection control signal. If the optical signal receivers 2030 of the communication node 1000-2 and the communication node 1000-3 are free, the control circuit 1120 sets the output wavelengths of the wavelength variable light sources 1340-2 and 1340-3 to λ2 and λ3, respectively. .

  The light of wavelength λ2 input from the input port 1360-2 of the first 4 × 4 arrayed waveguide diffraction grating 1350 is output from the output port 1370-1 of the first 4 × 4 arrayed waveguide diffraction grating 1350. . Further, the light of wavelength λ3 input from the input port 1360-3 of the first 4 × 4 arrayed waveguide diffraction grating 1350 is output from the output port 1370-1 of the first 4 × 4 arrayed waveguide diffraction grating 1350. Is done. That is, both the light of wavelength λ2 and the light of wavelength λ3 propagate through the optical waveguide 1020-1 and are input to the optical modulator 2010 of the communication node 1000-1. After the heads of both the light of wavelength λ2 and the light of wavelength λ3 pass through the optical modulator 2010, the control unit 2020 starts modulation. At this time, light of wavelength λ2 and light of wavelength λ3 are simultaneously modulated with the same data string. The signal light of wavelength λ2 and the signal light of wavelength λ3 propagate through the optical waveguide 1030-1 and are input to the input port 1060-1 of the second 4 × 4 arrayed waveguide diffraction grating 1050. The signal light having the wavelength λ2 is output from the output port 1070-2 of the second 4 × 4 arrayed waveguide diffraction grating 1050. And it is received by the optical signal receiver 2030 of the communication node 1000-2 via the optical waveguide 1090-2. On the other hand, the signal light having the wavelength λ3 is output from the output port 1070-3 of the second 4 × 4 arrayed waveguide diffraction grating 1050. And it is received by the optical signal receiver 2030 of the communication node 1000-3 via the optical waveguide 1090-3. Therefore, multicast transmission is performed from the communication node 1000-1 to the communication node 1000-2 and the communication node 1000-3.

  That is, by providing the wavelength routing device with a multicast function, it is possible to suppress variations in the time at which the optical signal reaches the receiving node and to reduce the load on the transmitting node.

In the present embodiment, the first 4 × 4 arrayed waveguide diffraction grating 1350 and the second 4 × 4 arrayed waveguide diffraction grating 1050 have wavelength circulation properties, and the relationship between input / output ports and wavelengths is shown in FIG. The relationship shown in FIG. 2 is assumed, but it is not necessary to have wavelength recursion as shown in FIG. This is because the wavelength tunable light sources 1340-1 to 1340-4 correspond one-to-one with the optical signal receivers of the communication nodes 1000-1 to 1000-4, even if they do not have wavelength circulatory properties. Details will be described below.
FIG. 13B shows how light having different wavelengths output from the wavelength tunable light source is routed by the wavelength routing device when the first 4 × 4 arrayed waveguide diffraction grating does not have circularity. It is a figure explaining this.

  For example, consider the light output from the wavelength tunable light source 1340-3 as shown in FIG. According to the relationship between the input / output port and the wavelength shown in FIG. 2B, the output port from which the light input from the input port 1360-3 of the first 4 × 4 arrayed waveguide grating 1350 is output is When the output light wavelength of the wavelength tunable light source 1340-3 is λ3, λ4, λ5, λ6, the output ports 1370-1, 1370-2, 1370-3, 1370 of the first 4 × 4 arrayed waveguide diffraction grating 1350, respectively. -4. The output ports 1370-1, 1370-2, 1370-3, 1370-4 of the first 4 × 4 arrayed waveguide grating 1350 are connected to the communication nodes 1000-1, 1000-2, 1000-3, 1000-4, respectively. Via, it is connected to the input ports 1060-1, 1060-2, 1060-3, 1060-4 of the second 4 × 4 arrayed waveguide grating 1050. Accordingly, the light beams λ3, λ4, λ5, and λ6 are input to the input ports 1060-1, 1060-2, 1600-3, and 1060-4 of the second 4 × 4 arrayed waveguide grating 1050, respectively. According to the relationship between the input / output port and the wavelength shown in FIG. 2B, the light of λ3, λ4, λ5, and λ6 are all output from the output port 1070-3 of the second 4 × 4 arrayed waveguide grating 1050. Is output. That is, the wavelength tunable light source 1340-3 and the optical receiver 2030 of the communication node 1000-3 have a one-to-one correspondence.

  Similarly, the wavelength variable light sources 1340-1, 1340-2, and 1340-4 also have a one-to-one correspondence with the optical receivers 2030 of the communication nodes 1000-1, 1000-2, and 1000-4.

  In said embodiment, the connection form of the control part 2020 of the communication nodes 1000-1 to 1000-4 and the control circuit 1120 of the wavelength routing apparatus 1010 is not ask | required.

(Embodiment 2)
FIG. 7 is a diagram illustrating an overall configuration of an optical network system including a wavelength routing device in which a connection control signal transmission / reception method is changed according to the second embodiment of this invention.

  FIG. 12B is a diagram illustrating a detailed configuration of the communication nodes 1000-1 to 1000-4 in the second embodiment. Example using optical waveguides 1030-1 to 1030-4 and optical waveguides 1090-1 to 1090-4 for connection between the control unit 2020 of the communication nodes 1000-1 to 1000-4 and the control circuit 1120 of the wavelength routing device 1010. Indicates. In FIG. 7, the wavelength routing apparatus 1010 includes control optical demultiplexers 7-1 to 7-4 and control optical multiplexers 8-1 to 8-4. In FIG. 12B, each of the communication nodes 1000-1 to 1000-4 includes a transmission optical multiplexer 2060 and a reception optical demultiplexer 2070.

  If the wavelength λcontrol of the connection control signal output from the control unit 2020 of each communication node is different from the wavelength of the light output from the wavelength variable light sources 1340-1 to 1340-4, the transmission optical multiplexer 2060 connects. It is possible to multiplex the control signal and the optical signal and demultiplex them with the control demultiplexers 7-1 to 7-4. Further, if the wavelength of the connection control signal output from the control circuit 1120 of the wavelength routing device 1010 is different from the wavelength of the light output from the wavelength variable light sources 1340-1 to 1340-4, the control optical multiplexer 8. The connection control signal and the optical signal can be multiplexed at -1 to 8-4, and can be demultiplexed by the receiving optical demultiplexer 2070.

  In addition, although an optical fiber may be used as the optical waveguide of this embodiment, it is not limited to this. According to the invention according to the second embodiment, the connection control signal is transmitted through the same optical waveguide as the optical signal, thereby omitting the connection of the control signal between each communication node and the control circuit of the wavelength routing device, There is an effect that the network configuration can be simplified.

(Embodiment 3)
FIG. 8 is a diagram showing an overall configuration of an optical network system including a wavelength routing device according to the third embodiment of the present invention.

  8, the optical network system includes communication nodes 1000-1 to 1000-4, a wavelength routing device 1010, and optical waveguides 4030-1 to 4030- connecting the wavelength routing device 1010 and the communication nodes 1000-1 to 1000-4. 4 and optical waveguides 1090-1 to 1090-4 connecting the wavelength routing device 1010 and the communication nodes 1000-1 to 1000-4.

  The wavelength routing device 1010 has input / output ports 3-1 to 3-4 and device output ports 6-1 to 6-4. The optical waveguides 4030-1 to 4030-4 are respectively connected to the input / output ports 3-1 to 3-4, and the optical waveguides 1090-1 to 1090-4 are respectively connected to the device output ports 6-1 to 6-4. Connected with.

  The wavelength routing apparatus 1010 has the same configuration as the wavelength routing apparatus in the first embodiment except that it has a circulator 4500.

  The light output from the wavelength tunable light sources 1340-1 to 1340-4 is diffracted from the input port 1360-1 to 1360-4 of the first 4 × 4 array waveguide diffraction grating 1350 by the first 4 × 4 array waveguide diffraction. Input to grid 1350.

  The first 4 × 4 arrayed waveguide diffraction grating 1350 of the present embodiment has a wavelength circulation property, and the relationship between the input / output port and the wavelength is as shown in FIG.

  In accordance with the relationship shown in FIG. 2A, light input to the first 4 × 4 arrayed waveguide grating 1350 is output from the output ports 1370-1 to 1370 of the first 4 × 4 arrayed waveguide grating 1350. -4.

  The lights output from the output ports 1370-1 to 1370-4 of the first 4 × 4 arrayed waveguide grating 1350 are the circulator 4500, the input / output ports 3-1 to 3-4, and the optical waveguide 4030-1 respectively. The communication nodes 1000-1 to 1000-4 are reached via 4030-4.

  FIG.12 (c) is a figure which shows the structure of the communication nodes 1000-1 to 1000-4 in the 3rd Embodiment of this invention.

  In FIG. 12C, the communication nodes 1000-1 to 1000-4 include a control unit 2020, a one-terminal optical modulator 4010, and an optical signal receiver 2030. The one-terminal optical modulator 4010 is connected to the optical waveguides 4030-1 to 4030-4.

  Light that propagates from the circulator 4500 through the optical waveguides 4030-1 to 4030-4 and is input to the one-terminal optical modulator 4010 is modulated by the one-terminal optical modulator 4030, and the optical waveguides 4030-1 to 4030-4 are used as signal light. Is propagated in the opposite direction. After passing through the circulator 4500 again, the signal light is input to the input ports 1060-1 to 1060-4 of the second 4 × 4 arrayed waveguide grating 1050.

  The second 4 × 4 arrayed waveguide diffraction grating 1050 of this embodiment has a wavelength circulation property, and the relationship between the input / output port and the wavelength is the relationship shown in FIG.

  In accordance with the relationship shown in FIG. 2A, the light input to the second 4 × 4 arrayed waveguide grating 1050 is output from the output ports 1070-1 to 1070 of the second 4 × 4 arrayed waveguide grating 1050. -4.

  The output ports 1070-1 to 1070-4 of the second 4 × 4 arrayed waveguide diffraction grating 1050 are connected to the communication nodes 1000-1 to 1000-4 through the optical waveguides 1090-1 to 1090-4, respectively. Yes.

  As described above, in the configuration of the present embodiment, the circulator 4500 connects the optical transmission paths 1020-1 to 1020-4 and the optical transmission paths 1030-1 to 1030-4 in the first embodiment with the transmission path 4040-. The configuration is replaced with 1 to 4030-4. Accordingly, the connection relationship between the communication nodes 1000-1 to 1000-4, the first 4 × 4 arrayed waveguide diffraction grating 1350, and the second 4 × 4 arrayed waveguide diffraction grating 1050 is the same as that of the first embodiment. Are the same. Therefore, the routing operation of this embodiment is exactly the same as that of the first embodiment.

  That is, as in the first embodiment, even if the output light wavelength of the wavelength variable light sources 1340-1 to 1340-4 is out of control, there is no possibility of communication interference with communication between other communication nodes.

  Furthermore, as in the first embodiment, by providing the wavelength routing device with a multicast function, it is possible to suppress variations in the time at which the optical signal reaches the reception node and to reduce the load on the transmission node.

In the present embodiment, the first 4 × 4 arrayed waveguide diffraction grating 1350 and the second 4 × 4 arrayed waveguide diffraction grating 1050 have wavelength circulation properties, and the relationship between input / output ports and wavelengths is shown in FIG. The relationship shown in FIG. 2 is assumed, but it is not necessary to have wavelength recursion as shown in FIG. As described in the first embodiment, the wavelength variable light sources 1340-1 to 1340-4 are in one-to-one correspondence with the optical signal receivers of the communication nodes 1000-1 to 1000-4 even without the wavelength recursion. It is because it corresponds.
In said embodiment, the connection form of the control part 2020 of the communication nodes 1000-1 to 1000-4 and the control circuit 1120 of the wavelength routing apparatus 1010 is not ask | required.

(Embodiment 4)
FIG. 9 is a diagram illustrating an overall configuration of an optical network system including a wavelength routing device in which a connection control signal transmission / reception method according to the third embodiment is changed according to a fourth embodiment of the present invention.

  FIG. 12D is a diagram illustrating a detailed configuration of the communication nodes 1000-1 to 1000-4 in the fourth embodiment. Example using optical waveguides 4030-1 to 4030-4 and optical waveguides 1090-1 to 1090-4 for connection between the control unit 2020 of the communication nodes 1000-1 to 1000-4 and the control circuit 1120 of the wavelength routing device 1010 Indicates. In FIG. 9, the wavelength routing device 1010 includes control optical demultiplexers 7-1 to 7-4 and control optical multiplexers 8-1 to 8-4. In FIG. 12D, the communication nodes 1000-1 to 1000-4 have a transmission optical multiplexer 4060 and a reception optical demultiplexer 2070, respectively.

  If the wavelength λcontrol of the connection control signal output from the control unit 2020 is different from the wavelength of the light output from the wavelength variable light sources 1340-1 to 1340-4, the transmission optical multiplexer 4060 transmits the connection control signal and the light. The signals can be multiplexed and demultiplexed by the control optical demultiplexers 7-1 to 7-4. Further, if the wavelength of the connection control signal output from the control circuit 1120 of the wavelength routing device 1010 is different from the wavelength of the light output from the wavelength variable light sources 1340-1 to 1340-4, the control optical multiplexer 8. The connection control signal and the optical signal can be multiplexed at -1 to 8-4, and can be demultiplexed by the receiving optical demultiplexer 2070.

  According to the invention according to the fourth embodiment, the connection control signal is transmitted through the same optical waveguide as the optical signal, thereby omitting the connection of the connection control signal between each communication node and the control circuit of the wavelength routing device, There is an effect that the network configuration can be simplified.

  In addition, although an optical fiber may be used as the optical waveguide of this embodiment, it is not limited to this.

  FIG. 14 shows a specific configuration example of the one-terminal optical modulator 4010 in the third embodiment and the fourth embodiment, and shows a case where the circulator 4700 and the optical modulator 4710 are configured. The optical modulator 4710 has an input port 4720 and an output port 4730. Light propagated from the wavelength routing device 1010 through the optical waveguides 4030-1 to 4030-4 passes through the circulator 4700 and enters the input port 4720 of the optical modulator 4710. The light passes through the optical modulator 4710, is output from the output port 4730, passes through the circulator 4700, propagates through the optical waveguides 4030-1 to 4030-4, and travels toward the wavelength routing device 1010.

  FIG. 15 shows another configuration example of the one-terminal optical modulator 4010, and shows a case where it is configured from a reflective optical modulator 4800. The reflective optical modulator 4800 has an input / output port 4810. Light propagated from the wavelength routing device 1010 via the optical waveguides 4030-1 to 4030-4 is input from the input / output port 4810 to the reflective optical modulator 4800. The light is modulated and reflected by the reflection type optical modulator 4800, output from the input / output port 4810, propagates through the optical waveguides 4030-1 to 4030-4, and travels toward the wavelength routing device 1010.

(Embodiment 5)
FIG. 10 is a diagram showing an overall configuration of an optical network system including a wavelength routing apparatus according to the fifth embodiment of the present invention.

  10, the optical network system includes communication nodes 1000-1 to 1000-4, a wavelength routing device 1010, and optical waveguides 4030-1 to 4030- connecting the wavelength routing device 1010 and the communication nodes 1000-1 to 1000-4. 4 and optical waveguides 1090-1 to 1090-4 connecting the wavelength routing device 1010 and the communication nodes 1000-1 to 1000-4.

  The wavelength routing device 1010 has input / output ports 3-1 to 3-4 and device output ports 6-1 to 6-4. The optical waveguides 4030-1 to 4030-4 are respectively connected to the input / output ports 3-1 to 3-4, and the optical waveguides 1090-1 to 1090-4 are respectively connected to the device output ports 6-1 to 6-4. Connected with.

  The wavelength routing apparatus 1010 includes wavelength tunable light sources 1340-1 to 1340-4, a 4 × 4 arrayed waveguide diffraction grating 4350, a circulator 4600, and a control circuit 1120. Further, the 4 × 4 arrayed waveguide diffraction grating 4350 has ports A4360-1 to 1360-4 and ports B4370-1 to 4370-4.

  Here, the ports of the 4 × 4 arrayed waveguide grating 4350 are not the input port and the output port, but the port A and the port B. As will be described later, since the light once passing through the 4 × 4 array waveguide diffraction grating 4350 propagates again from the opposite direction and passes through the 4 × 4 array waveguide diffraction grating 4350, the port is thus A and port B. Therefore, the configuration and operation of the 4 × 4 arrayed waveguide grating 4350 are not different from those in the above-described embodiments.

  The light output from the wavelength tunable light sources 1340-1 to 1340-4 passes through the circulator 4600 and passes from the ports B 4370-1 to 4370-4 of the 4 × 4 array waveguide diffraction grating 4350 to the 4 × 4 array waveguide diffraction grating. 4350.

  The 4 × 4 arrayed waveguide diffraction grating 4350 of the present embodiment has a wavelength circulation property, and the relationship between the input / output port and the wavelength is as shown in FIG.

  In accordance with the relationship shown in FIG. 2A, the light input to the 4 × 4 arrayed waveguide diffraction grating 4350 is output from one of the ports A 4360-1 to 4360-4 of the 4 × 4 arrayed waveguide diffraction grating 4350. Is done.

  The light output from the ports A4360-1 to 4360-4 of the 4 × 4 arrayed waveguide diffraction grating 4350 is communicated via the input / output ports 3-1 to 3-4 and the optical waveguides 4030-1 to 4030-4, respectively. The nodes 1000-1 to 1000-4 are reached.

  The details of the communication nodes 1000-1 to 1000-4 in the fifth embodiment are exactly the same as those in the third embodiment, and have the configuration shown in FIG.

  The light input to the one-terminal optical modulator 4010 in the communication nodes 1000-1 to 1000-4 is modulated and propagates again in the reverse direction through the optical waveguides 4030-1 to 4030-4 as signal light. The signal light is input to ports A 4360-1 to 4360-4 of the 4 × 4 arrayed waveguide diffraction grating 4350. In accordance with the relationship between the input / output port and wavelength shown in FIG. 2A, the signal light input to the 4 × 4 arrayed waveguide grating 4350 is port B4370-1 of the 4 × 4 arrayed waveguide grating 4350. 4370-4 is output from any one of 4370-4, passes through the circulator 4600 again, propagates through the optical waveguides 1090-1 to 1090-4, and reaches the communication nodes 1000-1 to 1000-4.

  The light of the wavelengths λ1, λ2, λ3, and λ4 output from the wavelength tunable light source 1340-1 always passes through one of the communication nodes 1000- to 1000-4, and is always an output port of the 4 × 4 array waveguide diffraction grating 4350. Output from B4370-1. Below, it demonstrates in detail using drawing.

  FIG. 13C is a diagram for explaining how light having different wavelengths output from the wavelength tunable light source is routed by the wavelength routing apparatus.

  According to the relationship between the input / output port and the wavelength shown in FIG. 2A, the output port from which the light input from the port B 4370-1 of the 4 × 4 arrayed waveguide grating 4350 is output has the wavelength of the light. When λ1, λ2, λ3, and λ4, the ports A4360-1, 4360-2, 4360-3, and 4360-4 of the 4 × 4 arrayed waveguide diffraction grating 4350 are obtained. The light output from the ports A 4360-1, 4360-2, 4360-3, 4360-4 of the 4 × 4 arrayed waveguide diffraction grating 4350 is the communication nodes 1000-1, 1000-2, 1000-3, 1000-4, respectively. , And returns to the ports A 4360-1, 4360-2, 4360-3, 4360-4 of the 4 × 4 arrayed waveguide grating 4350 again. Accordingly, light of wavelengths λ1, λ2, λ3, and λ4 is input to ports A 4360-1, 4360-2, 4360-3, and 4360-4 of the 4 × 4 arrayed waveguide grating 4350, respectively. According to the relationship between the input / output port and the wavelength shown in FIG. 2A, all of the light beams having the wavelengths λ1, λ2, λ3, and λ4 are output from the port B4370-1 of the 4 × 4 arrayed waveguide diffraction grating 4350. The Therefore, as shown in FIG. 13C, the light output from the wavelength tunable light source 1340-1 is always output from the port B 4370-1 of the 4 × 4 arrayed waveguide grating 4350.

  Similarly, the light output from the wavelength tunable light source 1340-2 is always output from the port B4370-2 of the 4 × 4 arrayed waveguide diffraction grating 4350.

  Similarly, the light output from the wavelength tunable light source 1340-3 is necessarily output from the port B 4370-3 of the 4 × 4 arrayed waveguide diffraction grating 4350.

  Similarly, the light output from the wavelength tunable light source 1340-4 is always output from the port B 4370-4 of the 4 × 4 arrayed waveguide diffraction grating 4350.

  That is, the variable wavelength light sources 1340-1 to 1340-4 correspond one-to-one with the optical signal receivers 2030 of the communication nodes 1000-1 to 1000-4 regardless of the wavelength of the output light. Therefore, similarly to the first embodiment, even if the control of the output light wavelength of the wavelength tunable light sources 1340-1 to 1340-4 occurs, there is no possibility of causing communication interference with communication between other communication nodes.

  Furthermore, as in the first embodiment, by providing the wavelength routing device with a multicast function, it is possible to suppress variations in the time at which the optical signal reaches the receiving node and to reduce the load on the transmitting node.

  As described above, the routing operation of the fifth embodiment is exactly the same as that of the first embodiment and the third embodiment.

  In the present embodiment, the 4 × 4 arrayed waveguide diffraction grating 4350 has wavelength recirculation, and the relationship between the input / output port and the wavelength is assumed to be that shown in FIG. 2A. However, as shown in FIG. It does not have to have sex. As described in the first embodiment, the wavelength variable light sources 1340-1 to 1340-4 are in one-to-one correspondence with the optical signal receivers of the communication nodes 1000-1 to 1000-4, respectively, without having the wavelength recursion. It is because it corresponds to.

  The connection form between the control unit 2020 of the communication nodes 1000-1 to 1000-4 and the control circuit 1120 may be the same as in the first embodiment and the third embodiment.

(Embodiment 6)
FIG. 11 is a diagram illustrating an overall configuration of an optical network system including a wavelength routing device according to a sixth embodiment of the present invention, in which a connection control signal transmission / reception method according to the fifth embodiment is changed.

  11, the optical network system includes communication nodes 1000-1 to 1000-4, a wavelength routing device 1010, and optical waveguides 4030-1 to 4030- connecting the wavelength routing device 1010 and the communication nodes 1000-1 to 1000-4. 4 and optical waveguides 1090-1 to 1090-4 connecting the wavelength routing device 1010 and the communication nodes 1000-1 to 1000-4. The configuration is the same as that of the optical network system of the fifth embodiment.

  The wavelength routing apparatus 1010 includes the control optical demultiplexers 7-1 to 7-4 and the control optical multiplexers 8-1 to 8-4, and the wavelength routing apparatus of the fifth embodiment. Is different.

  FIG. 12D is a diagram illustrating a detailed configuration of the communication nodes 1000-1 to 1000-4 in the sixth embodiment. In FIG. 12D, the communication nodes 1000-1 to 1000-4 have a transmission optical multiplexer 4060 and a reception optical demultiplexer 2070, respectively.

  If the wavelength λcontrol of the connection control signal output from the control unit 2020 is different from the wavelength of the light output from the wavelength variable light sources 1340-1 to 1340-4, the transmission optical multiplexer 4060 transmits the connection control signal and the light. The signals can be multiplexed and demultiplexed by the control optical demultiplexers 7-1 to 7-4. Further, if the wavelength of the connection control signal output from the control circuit 1120 of the wavelength routing device 1010 is different from the wavelength of the light output from the wavelength variable light sources 1340-1 to 1340-4, the control optical multiplexer 8. The connection control signal and the optical signal can be multiplexed at -1 to 8-4, and can be demultiplexed by the receiving optical demultiplexer 2070.

  In addition, although an optical fiber may be used as the optical waveguide of this embodiment, it is not limited to this. According to the invention according to the sixth embodiment, by transmitting the connection control signal through the same optical waveguide as the optical signal, connection of the connection control signal between each communication node and the control circuit of the wavelength routing device is omitted, The network configuration can be simplified.

  FIG. 14 shows a case where the one-terminal optical modulator 4010 in the fifth and sixth embodiments is composed of a circulator 4700 and an optical modulator 4710. The configuration is the same as that of the third embodiment and the fourth embodiment.

  FIG. 15 shows a case where the one-terminal optical modulator 4010 in the fifth embodiment and the sixth embodiment is composed of a reflective optical modulator 4800. The configuration is the same as that of the third embodiment and the fourth embodiment.

It is a figure which shows the optical network based on the conventional wavelength routing. It is a figure which shows the relationship between the input-output port of a 4x4 array waveguide diffraction grating, and a wavelength. It is a figure which shows the optical network based on the wavelength routing using a wavelength variable light source. It is a figure which shows the operation example of the optical network system which is operating normally. It is a figure which shows the operation example of the optical network system which is performing abnormal operation | movement. It is a figure which shows the 1st Embodiment of this invention. It is a figure which shows the 2nd Embodiment of this invention. It is a figure which shows the 3rd Embodiment of this invention. It is a figure which shows the 4th Embodiment of this invention. It is a figure which shows the 5th Embodiment of this invention. It is a figure which shows the 6th Embodiment of this invention. It is a figure which shows the structure of a communication node. It is a figure explaining the routing operation | movement of this invention. It is a figure which shows the structural example of a 1 terminal optical modulator. It is a figure which shows the other structural example of a 1 terminal optical modulator.

Explanation of symbols

3-1 to 3-4 I / O ports 4-1 to 4-4 Optical output ports 5-1 to 5-4 Device input ports 6-1 to 6-4 Device output ports 7-1 to 7-4 Control light Demultiplexer 8-1 to 8-4 Control optical multiplexers 10-1 to 10-4, 200-1 to 200-4, 1000-1 to 1000-4 Communication node 11 4 × 4 array waveguide diffraction grating 12 -1 to 12-4, 13-1 to 13-4, 280-1 to 280-4, 290-1 to 290-4, 1020-1 to 1020-4, 1030-1 to 1030-4, 1090-1 1090-4, 4030-1 to 4030-4 Optical waveguide 14-1 to 14-4 Input port of 4 × 4 array waveguide diffraction grating 11 15-1 to 15-4 4 × 4 array waveguide diffraction grating 11 Output port
210 Wavelength Variable Light Source Built-in Optical Signal Transmitter 220 Wavelength Variable Light Source Control Unit 230 Optical Signal Receiver 250 4 × 4 Wavelength Circular Array Waveguide Diffraction Grating 251-1 to 251-4 Input Port 252-1 to 252-4 Output Port 270 Control signal line
1010 Wavelength routing device 1050 Second 4 × 4 array waveguide diffraction grating 1060-1 to 1060-4 Input port of second 4 × 4 array waveguide diffraction grating 1050 1070-1 to 1070-4 Second 4 × Output port of 4 array waveguide diffraction grating 1050 1120 Control circuit 1340-1 to 1340-4 Variable wavelength light source 1350 First 4 × 4 array waveguide diffraction grating 1360-1 to 1360-4 First 4 × 4 array conductor Waveguide diffraction grating 1350 input port 1370-1 to 1370-4 4 × 4 array waveguide diffraction grating 1350 output port 2010, 4710 Optical modulator 2020 Control unit 2030 Optical signal receiver 2060 Transmitting optical multiplexer 2070 Optical demultiplexer for reception 4010 Single-terminal optical modulator 4060 Optical multiplexer for transmission 4350 4 × 4 array waveguide Port A of the diffraction grating 4360-1~4360-4 4 × 4 array waveguide diffraction grating 4350
4370-1 to 4370-4 Port B of 4 × 4 Arrayed Waveguide Grating 4350
4500, 4600, 4700 Circulator 4720 Input port 4730 Output port 4800 Reflective light modulator 4810 I / O port

Claims (7)

In a wavelength routing apparatus constituting an optical network system capable of arbitrarily connecting N communication nodes,
An optical output port connected to the input port of the optical modulator of the communication node via a first optical waveguide;
A device input port connected to the output port of the optical modulator of the communication node via a second optical waveguide;
A device output port connected to the optical signal receiver of the communication node via a third optical waveguide;
A control circuit for transmitting and receiving a connection control signal for controlling communication connection between the communication nodes with the control unit of the communication node;
N wavelength variable light sources whose wavelengths of output light are determined by a light source control signal from the control circuit;
A first N × N array waveguide diffraction grating in which the tunable light source is connected to an input port, and the optical output port is connected to an output port;
A second N × N arrayed waveguide grating with the device input port connected to the input port and the device output port connected to the output port;
The wavelength of the output light of the wavelength tunable light source is determined by the connection control signal including transmission destination information emitted by a transmission source communication node, and the output light is modulated by an optical modulator of the transmission source communication node. A featured wavelength routing device. A connection control signal separating means connected between the device input port and the input port of the second N × N arrayed waveguide grating;
Connection control signal combining means connected between the device output port and the output port of the second N × N arrayed waveguide grating,
The wavelength routing device according to claim 1, wherein the connection control signal is transmitted by the second optical waveguide and the third optical waveguide. In a wavelength routing apparatus constituting an optical network system capable of arbitrarily connecting N communication nodes,
An input / output port connected to the one-terminal optical modulator of the communication node via a first optical waveguide;
A device output port connected to the optical signal receiver of the communication node via a second optical waveguide;
A control circuit for transmitting and receiving a connection control signal for controlling communication connection between the communication nodes with the control unit of the communication node;
N wavelength variable light sources whose wavelengths of output light are determined by a light source control signal from the control circuit;
A first N × N array waveguide diffraction grating in which the wavelength tunable light source is connected to an input port;
N circulators in which the first N × N arrayed waveguide grating is connected to a first port and the input / output port is connected to a second port;
A second N × N arrayed waveguide grating with a third port of the circulator connected to the input port and the device output port connected to the output port;
The wavelength of the output light of the wavelength tunable light source is determined by the connection control signal including transmission destination information emitted from a transmission source communication node, and the output light is modulated by a one-terminal optical modulator of the transmission source communication node. A wavelength routing device characterized by that. A connection control signal separating means connected between the N circulators and an input port of the second N × N arrayed waveguide grating;
Connection control signal combining means connected between the device output port and the output port of the second N × N arrayed waveguide grating,
4. The wavelength routing device according to claim 3, wherein the connection control signal is transmitted through the first optical waveguide and the second optical waveguide. In a wavelength routing apparatus constituting an optical network system capable of arbitrarily connecting N communication nodes,
An input / output port connected to the one-terminal optical modulator of the communication node via a first optical waveguide;
A device output port connected to the optical signal receiver of the communication node via a second optical waveguide;
A control circuit for transmitting and receiving a connection control signal for controlling communication connection between the communication nodes with the control unit of the communication node;
N wavelength variable light sources whose wavelengths of output light are determined by a light source control signal from the control circuit;
N circulators in which the wavelength tunable light source is connected to a first port and the device output port is connected to a third port;
A second port of the circulator is connected to an input port, and the input / output port is connected to an output port;
The wavelength of the output light of the wavelength tunable light source is determined by the connection control signal including transmission destination information emitted from a transmission source communication node, and the output light is modulated by a one-terminal optical modulator of the transmission source communication node. A wavelength routing device characterized by that. A connection control signal separating means connected between the input / output port and the output port of the N × N arrayed waveguide grating;
A connection control signal synthesis means connected between the device output port and the circulator;
6. The wavelength routing device according to claim 5, wherein the connection control signal is transmitted through the first optical waveguide and the second optical waveguide.   2. The first N × N arrayed waveguide diffraction grating, the second N × N arrayed waveguide diffraction grating, and the N × N arrayed waveguide diffraction grating have wavelength recursive properties. 6. The wavelength routing device according to any one of 6 above.

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