JP2011250290A - Optical path setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical path setting method in which usage of a WSS with no hitless function has no impact on other optical path signals when an optical path is opened or removed.SOLUTION: In an optical path setting method in an optical node system provided, as a receiving optical node, with an optical node having a path switching 1xN1 WSS which selects signal light of a received WDM signal in units of wavelength and outputs the selected signal light to the output path side or the branch side, and a wavelength allocation 1xN2 WSS with no hitless function for connecting a WDM signal branched from the path switching 1xN1 WSS to a transponder, setting of the path switching 1xN1 WSS is performed after setting the wavelength allocation 1xN2 when an optical path from a transmission optical node to the receiving optical node is set, or setting of the wavelength allocation 1xN2 is performed after setting the path switching 1xN1 WSS when the optical path is removed.

Description

  The present invention relates to an optical path setting method in a photonic network composed of a plurality of ROADM nodes.

  FIG. 1 shows a configuration example of a conventional photonic NW. As shown in FIG. 1, the photonic NW includes a plurality of optical nodes, optical fibers connecting the optical nodes, and an NW management control device that manages and controls the optical nodes in the NW.

  When a client signal is transferred via the photonic NW, the client signal is converted into an optical signal at the optical node that transmits the signal, and the converted optical signal is received from the transmitting optical node. The optical signal is transferred to the optical node without being converted into electricity, and is converted from an optical signal to a client signal at the receiving optical node. At this time, the path of the optical signal from the transmission optical node to the reception optical node is called an optical path, and the optical signal is called an optical path signal.

  In the photonic NW of FIG. 1, a reconfigurable optical add / drop multiplexer (ROADM) node is used as an optical node. The ROADM node is a node that can branch and insert an optical path signal in wavelength units from a wavelength multiplexed signal (WDM signal) transferred from an adjacent ROADM node and transfer the wavelength multiplexed signal to another adjacent ROADM node. . ROADM nodes include 2-degree ROADM that can be connected to two adjacent ROADM nodes, and Multi-degree ROADM that can be connected to three or more adjacent ROADM nodes. By these ROADM nodes, ring NW, multi-ring NW Can build a mesh NW. Note that “degree” in 2-degree ROADM, Multi-degree ROADM, etc. means the number of routes, and corresponds to the number of adjacent ROADM nodes to which the ROADM node can be connected.

  FIG. 2 shows a configuration example of a conventional multi-degree ROADM node 10. As shown in FIG. 2, this Multi-degree ROADM node 10 transmits to an adjacent node or transmits an optical amplifier 1 that amplifies a WDM signal received from the adjacent node, and converts a client signal into an optical path signal. And a transponder 2 that receives an optical path signal and converts it into a client signal, and means for switching the path of the optical path signal.

  In the configuration example shown in FIG. 2, the optical coupler 3, 1x9 WSS4, and 9x1 WSS5 are used as means for switching the path of the optical path signal. Here, the WSS (Wavelength Selective Switch) is a switch that can input / output WDM signals at each input / output port and select an input or output port by wavelength within the switch. WSS of input 1 port output 9 port is 1x9 WSS, and WSS of input 9 port output 1 port is 9x1 WSS.

  In the configuration example shown in FIG. 2, the transponder 2 has a colorless function capable of transmitting and receiving an optical path signal of an arbitrary wavelength. In addition to the configuration shown in FIG. 2, the configuration of the optical node includes a ROADM node without a colorless function and a 2-degree ROADM node.

E. Bert. Basch, et.al, "Architectural Tradeoffs for Reconfigurable Dense Wavelength-Division Multiplexing Systems", IEEE J. of selected topics in Quantum electronics. Vol. 12, No.4, JULY / AUGUST 2006 Y. Ishii. Et.al, "MEMS-based 1x43 Wavelength-Selective Switch with Flat Passband", 35th European Conference on Optical communication proceeding ", PD1-9, September, 2009

In the photonic NW, the wavelengths are usually arranged at intervals of 100 GHz and 50 GHz in the C-band band or L-band band, so the number of wavelength multiplexing is about 40 or about 80. However, since the 9-port WSS is used as the wavelength assignment WSS connected to the transponder 2 in the configuration of FIG. 2, only 9 optical path signals can be branched / inserted per route. The optical path signal for the wavelength cannot be branched and inserted. In order to add and drop optical path signals for all wavelengths, it is necessary to increase the number of WSS ports that currently have nine ports, but WSS reported that the number of ports has been increased to about 40 as an attempt to increase the number of WSS ports. Has been. (Non-Patent Document 2)
However, when this 40-port class WSS is applied to the configuration of FIG. 2, the following problems occur. Normally, 1x9 WSS and 9x1 WSS have a hitless function that prevents signals from leaking to other ports when switching ports. However, in the case of a 40-port WSS such as the WSS shown in Non-Patent Document 2, if a hitless function is provided, new parts are required and the cost is increased. For this reason, it is desirable not to have a hitless function in terms of cost, but if an optical node is realized using a 40-port class WSS that does not have this hitless function, the WSS will be used when the optical path is opened and deleted. At the time of setting, the signal leaks to other ports and affects other optical path signals.

  The present invention has been made in view of such a problem.In the optical node constituting the photonic NW, even if a WSS having no hitless function is used while suppressing an increase in cost without adding new parts, It is an object of the present invention to provide an optical path setting method that does not affect other optical path signals when an optical path is opened or deleted.

  In order to solve the above problems, the present invention selects a signal light of a received WDM signal in units of wavelength and outputs it to an output route side or a branch side. An optical path setting method in an optical node system including, as a reception optical node, an optical node having a wavelength allocation 1xN2 WSS that does not have a hitless function that connects to a transponder that receives a WDM signal branched from a 1xN1 WSS, When setting the optical path from the transmitting optical node to the receiving optical node, after setting the wavelength allocation 1xN2 WSS, set the path switching 1xN1 WSS, or delete the optical path In this case, after setting the route switching 1xN1 WSS, the wavelength allocation 1xN2 WSS is set, and the optical path setting method is configured.

  The present invention also selects an optical path signal to be transmitted to the next optical node in wavelength units from the WDM signal received from another optical node, and combines the selected optical path signal with the optical path signal to be inserted. Receives an optical node that has N1x1 WSS for switching the wave path and 1xN2 WSS for wavelength assignment without hitless function that connects to the transponder that receives the signal light of the WDM signal received from other optical nodes in wavelength units An optical path setting method in an optical node system provided as an optical node and an upstream optical node, wherein when setting an optical path from a transmission optical node to the reception optical node, the wavelength assignment 1xN2 in the reception optical node After setting the WSS, when setting the route switching N1x1 WSS of the upstream optical node, or when deleting the optical path, the route switching 1xN1 WSS of the upstream optical node Set the line After the may be configured as an optical path setting method characterized in that the setting of the wavelength allocation 1XN2 WSS in the received optical node.

  The present invention also selects an optical path signal to be transmitted to the next optical node in wavelength units from the WDM signal received from another optical node, and combines the selected optical path signal with the optical path signal to be inserted. Receives an optical node that has N1x1 WSS for switching the wave path and 1xN2 WSS for wavelength assignment without hitless function that connects to the transponder that receives the signal light of the WDM signal received from other optical nodes in wavelength units An optical path setting method in an optical node system provided as an optical node and an upstream optical node, when setting an optical path from a transmission optical node to the reception optical node, or when deleting the optical path, Before setting the 1xN2 WSS for wavelength allocation in the receiving optical node, stop the output of the optical path signal set in the N1x1 WSS for path switching in the upstream optical node. It can also be configured as a setting method.

  The present invention also selects an optical path signal to be transmitted to the next optical node in wavelength units from the WDM signal received from another optical node, and combines the selected optical path signal with the optical path signal to be inserted. Receives an optical node that has N1x1 WSS for switching the wave path and 1xN2 WSS for wavelength assignment without hitless function that connects to the transponder that receives the signal light of the WDM signal received from other optical nodes in wavelength units An optical path setting method in an optical node system provided as an optical node and an upstream optical node, wherein when setting an optical path from a transmission optical node to the reception optical node, the wavelength allocation 1xN2 in the reception optical node After setting the WSS, the transponder in the transmission optical node is turned off or the transponder in the transmission optical node is extinguished when the optical path is deleted. Thereafter, the optical path setting method may be characterized in that setting of the 1xN2 WSS for wavelength allocation in the receiving optical node is performed.

  The present invention also provides an optical node having a 1xN3 WSS for route switching without a hitless function for selecting the signal light of the received WDM signal in units of wavelengths and outputting it to the output route side or the branch side. An optical path setting method in an optical node system provided as a node and an upstream optical node, wherein when setting an optical path from a transmitting optical node to the receiving optical node, the path switching 1xN3 in the receiving optical node After setting the WSS, set the 1xN3 WSS for path switching or the N3x1 WSS for path switching in the upstream optical node, or perform light emission of the transponder in the transmission optical node, or change the optical path When deleting, before setting the 1xN3 WSS for route switching in the receiving optical node, the setting of the 1xN3 WSS for route switching or N3x1 WSS for route switching in the upstream optical node, or Performing the quenching of the transponder in the serial transmission optical node can be configured as an optical path setting method according to claim.

  In each of the above optical path setting methods, before setting the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching, the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching is input. After confirming the presence or absence of an optical path signal using a monitor, and confirming that there is no optical path signal in the monitor, set the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching. Also good.

  In each of the optical path setting methods described above, a monitor for measuring optical power is connected to one of the output ports of the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching, and at the time of setting the optical path Before setting the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching, set the connection destination of the wavelength of the optical path signal to be set to the output port connected to the monitor Then, after confirming that there is no optical path signal by the monitor, the wavelength allocation 1xN2 WSS or the path switching 1xN3 WSS may be set.

Further, in each of the optical path setting methods, when the optical path is deleted, the optical path is set in the transponder of the receiving optical node before setting the 1xN2 WS for wavelength allocation or the 1xN3 WSS for path switching. After confirming that there is no signal, the setting of the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for route switching may be performed.

  According to the present invention, in an optical node constituting a photonic NW, even if a WSS having no hitless function is used without adding new parts and suppressing an increase in cost, another optical path is opened or deleted when an optical path is opened. An optical path setting method that does not affect the signal can be realized.

It is a figure which shows the structural example of the conventional photonic NW. 1 is a diagram illustrating a configuration example of a conventional Multi-degree ROADM node 10. FIG. It is a figure which shows the structural example of the optical node 100 used in Example 1 etc. FIG. FIG. 5 is a diagram illustrating an optical path opening procedure in the first embodiment. FIG. 6 is a diagram illustrating an optical path deletion procedure in the first embodiment. 6 is a diagram illustrating a configuration example of an optical node 200 in Embodiment 2. FIG. FIG. 10 is a diagram illustrating an optical path opening procedure in the second embodiment. FIG. 10 is a diagram illustrating an optical path deletion procedure in the second embodiment. It is a figure which shows the structural example of the optical node 300 used by Example 3 etc. FIG. It is a figure which shows the structural example of the optical node 300 used by Example 3 etc. FIG. FIG. 10 is a diagram illustrating an optical path opening procedure in the third embodiment. FIG. 10 is a diagram illustrating an optical path deletion procedure according to the third embodiment. FIG. 10 is a diagram illustrating an optical path opening procedure in the fourth embodiment. FIG. 10 is a diagram illustrating an optical path deletion procedure according to the fourth embodiment. FIG. 10 is a diagram illustrating an optical path opening procedure in the fifth embodiment. FIG. 10 is a diagram illustrating an optical path deletion procedure in the fifth embodiment. FIG. 10 is a diagram illustrating a configuration example of an optical node 400 in the sixth embodiment. FIG. 10 is a diagram illustrating a configuration example of an optical node 400 in the sixth embodiment. It is a figure which shows the optical path opening procedure in Example 6. FIG. It is a figure which shows the optical path deletion procedure in Example 6. FIG. FIG. 10 is a diagram illustrating a configuration example of an optical node 500 according to a seventh embodiment. FIG. 10 is a diagram illustrating an optical path opening procedure in the seventh embodiment. FIG. 10 is a diagram illustrating an optical path deletion procedure in the seventh embodiment. FIG. 10 is a diagram illustrating a configuration example of an optical node 600 according to a seventh embodiment.

  Examples 1 to 7 as embodiments of the present invention will be described below with reference to the drawings.

(Example 1)
FIG. 3 is a diagram illustrating a configuration example of the optical node 100 used in the first embodiment and the like, and illustrates a configuration of the optical node 100 having a colorless function with the number of routes M. As shown in the figure, an optical node 100 includes an optical amplifier 101, a route switching 1 × N1 WSS102, a route switching N1 × 1 WSS103, a wavelength allocation 1 × N2 WSS104, a wavelength allocation N2 × 1 WSS105, and a transponder 106. And OCM (Optical Channel Monitor) 107.

  In the optical node 100, an optical multiplexer such as an optical coupler may be used instead of the route switching N1 × 1 WSS 103, and an optical coupler such as an optical coupler may be used instead of the wavelength assignment N2 × 1 WSS 105. Here, the number of ports required for N1 is approximately the number of routes, but the number of ports required for N2 is the number of wavelengths to be added / dropped. Minutes are required. In the present embodiment, the number of wavelength multiplexing is assumed to be larger than about 40, for example, and WSS without hitless function is used for wavelength allocation 1 × N2 WSS and wavelength allocation N2 × 1 WSS.

  FIG. 4 shows a procedure for opening an optical path when a photonic NW is constructed by connecting a plurality of optical nodes 100 having the configuration shown in FIG. In the photonic NW according to the present embodiment, as shown in FIG. 1, an NW management control device is connected to each optical node, and each optical node is based on an optical path setting control signal from the NW management control device. Processing for setting the optical path is performed. As described above, in the other embodiments, each optical node performs processing for optical path setting based on the optical path setting control signal from the NW management control device.

  However, the optical path setting method of the present invention can be applied not only to the remote optical path setting using the NW management control apparatus but also to the case where the optical path is set by directly operating the optical node, for example. Therefore, the optical path setting method of the present invention does not depend on the work mode for setting.

  FIG. 4 shows only one relay node, but the same setting control is performed for each relay node even when there are a plurality of relay nodes. The same applies to the other embodiments as long as no particular relay node is described.

  Also, in each procedure of each embodiment, which transponder or WSS of a plurality of transponders or WSS provided in the optical node is determined in the optical path design, and the information is NW management control. It is assumed that it is included in the optical path setting control signal sent from the apparatus, and in each procedure, a specific transponder or WSS designated by the control signal is set.

  Furthermore, reference numerals such as A and B attached to the procedure of each step in the drawing are reference numerals attached for easy understanding of the corresponding steps in each embodiment.

  When the optical path is opened, it is basically desirable to set from the upstream WSS (set in order from the transmission side to the reception side). This is because in WSS, negative feedback control that adjusts the output level to a certain level while monitoring the power of the output optical signal is applied. After setting WSS on the downstream side, setting WSS on the upstream side This is because the negative feedback control of the downstream WSS does not operate stably when the upstream WSS is set. Therefore, setting is performed in the following procedure in the transmission node and the relay node.

  Step 1) (Transmission node) The transponder 106 is caused to emit light.

  Step 2) (Transmission node) The N2x1 WSS 105 for wavelength allocation is set to insert (add) an optical path signal.

  Step 3) (Transmission node) A setting for inserting (adding) an optical path signal to the N1 × 1 WSS 103 for route switching is performed.

  Step 4) (Relay node) The through setting of the optical path signal is performed for the 1 × N1 WSS 102 for route switching.

Step 5) (Relay node) The through setting of the optical path signal is performed for the N1 × 1 WSS 103 for route switching.
The setting of N2x1 WSS105 for wavelength allocation (without hitless function) at the transmitting node will affect other optical paths even if it is set while the optical path signal to be set is input. Instead, it may be basically set from the WSS close to the transponder 106. This is because all other optical path signals input to the wavelength assignment N2x1 WSS 105 have different wavelengths, and the optical path signals to be set are disconnected by the path switching N1 x 1 WSS 103. This is because the optical path signal is not affected.

  However, in the receiving node, for the setting of 1xN2 WSS104 for wavelength allocation (not having the hitless function), if the WSS setting is performed while the signal of the optical path to be set is input, other output ports Since the optical path signal leaked to the optical fiber is input to the transponder 106, it affects other optical path signals. Therefore, as shown in FIG. 4, the optical path is set in the receiving node according to the following procedure.

  Step 6) (Reception node) Confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation.

  That is, in step 6, whether or not the wavelength assignment 1 × N2 WSS 104 can be set is confirmed at the WSS input. As a confirmation method, since the wavelength-division multiplexed signal is used at the WSS input terminal, the presence / absence of an optical path signal of the corresponding wavelength is confirmed by the optical channel monitor 107 (OCM).

  Step 7) (Receiving node) If there is no optical path signal of the corresponding wavelength in Step 6, the wavelength allocation 1xN2 WSS 104 is set to drop the optical path signal. In other words, an optical path signal having a corresponding wavelength is selected from the received wavelength multiplexed signal, and settings are made to output it to the target output port. At this time, negative feedback control is not performed.

  Step 8) (Receiving node) After the setting of the 1xN2 WSS 104 for wavelength allocation is completed in Step 7, the drop setting of the 1xN1 WSS 102 for route switching is performed.

  Step 9) (Reception Node) Finally, it is confirmed whether or not the transponder 106 is receiving light.

  In each optical node, if an optical multiplexer is used instead of the route switching N1 x 1 WSS 103, steps 3 and 5 can be omitted, and an optical multiplexer is used instead of the wavelength assignment N2 x 1 WSS 105. If so, step 2 can be omitted.

  Here, the stability of WSS negative feedback control will be described. In the procedure at the receiving node shown in FIG. 4, the WSS on the upstream side is set after the WSS setting on the downstream side. In this embodiment, one WSS is located downstream of the WSS on the upstream side to be set. Therefore, unstable operation of negative feedback control for output level adjustment is unlikely to occur, and this procedure is excellent in stability of negative feedback control.

  Next, a procedure for deleting an optical path is shown in FIG. When deleting an optical path, it is basically desirable to set from the downstream WSS (set in order from the receiving side to the transmitting side). This is because when WSS is set from the upstream side, the negative feedback control of the downstream WSS does not operate stably. However, in order to avoid affecting other optical path signals, optical path deletion at the receiving node is performed in the following procedure.

  Step 1) (Reception node) First, in order to cut the optical path signal input to the 1xN2 WSS 104 for wavelength allocation, the Drop setting of the optical path signal is deleted from the 1xN1 WSS 102 for path switching.

  Step 2) (Reception node) Confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation. That is, as in step 7 when setting an optical path, the OCM 107 or the like confirms that the corresponding optical path signal is not input.

  Step 3) (Reception node) If there is no corresponding optical path signal in Step 2, the Drop setting in the 1xN2 WSS 104 for wavelength allocation is deleted.

  Subsequently, optical path deletion is performed in the following procedure at the relay node and the transmission node.

  Step 4) (Relay node) Delete the through setting of the optical path signal for the N1 × 1 WSS 103 for route switching.

  Step 5) (Relay node) Delete the through setting of the optical path signal for the 1 × N1 WSS 102 for route switching.

  Step 6) (Transmission node) The optical path signal Add setting is deleted from the N1 × 1 WSS 103 for route switching.

  Step 7) (Transmission node) The optical path signal Add setting is deleted from the wavelength allocation N2x1 WSS 105.

  Step 8) (Transmission node) The transponder 106 is extinguished.

  Steps 4 and 6 can be omitted when an optical multiplexer is used instead of the route switching N1 x 1 WSS 103, and when an optical multiplexer is used instead of the wavelength assignment N2 x 1 WSS 105, steps are omitted. 7 can be omitted.

  Here, the stability of WSS negative feedback control will be described. At the receiving node, the upstream WSS settings are deleted after the upstream WSS settings are deleted. However, because there is only one WSS downstream of the upstream WSS to be deleted, negative feedback for output level adjustment. It is difficult for unstable control operations to occur, and this procedure is also excellent in the stability of negative feedback control.

  Further, in the transmission node, as shown in FIG. 5, after setting the deletion of the downstream route switching N1 × 1 WSS 103, the deletion setting of the wavelength allocation N2 × 1 WSS 105 may be performed. The reason for this is that even if the N2x1 WSS 105 for wavelength allocation is set while the optical path signal is input, the setting of the N1x1 WSS 103 for downstream path switching is in a disconnected state. This is because it has no effect.

  As described above, in the receiving node of the system (photonic network) in which the optical node composed of the 1xN1 WSS 102 for path switching and the 1xN2 WSS 104 for wavelength allocation without hitless function is connected as shown in FIG. When setting the optical path, set the 1xN2 WSS for optical path wavelength assignment, then set the 1xN1 WSS for path switching. When deleting the optical path, set the 1xN1 WSS for path switching and then assign the wavelength. By setting the 1 × N2 WSS 104, the optical path can be set and deleted without affecting other optical path signals. Further, according to the present optical path method, there is an advantage that an optical node can be realized at low cost without the need for new parts for realizing the hitless function.

  Also, before setting the wavelength allocation 1xN2 WSS 104, by providing a procedure for confirming that there is no optical path signal at the input of the wavelength allocation 1xN2 WSS 104, it is possible to inadvertently change the wavelength such as a failure of the path switching 1xN1 WSS 102. Even when an optical path signal is input to the 1xN2 WSS 104 for allocation, the 1xN2 WSS 104 for wavelength allocation can be set to prevent other optical path signals from being affected.

(Example 2)
Next, Example 2 will be described. FIG. 6 shows the configuration of the optical node 200 used in the second embodiment. The optical node 200 is an optical node having a colorless function with the same number M of routes as in FIG. 3, but the means for checking the presence / absence of an optical path signal at the input of the 1 × N2 WSS 104 for wavelength allocation is different. In FIG. 6, instead of the OCM 107, means for measuring the power of the PD 108 or the like is connected to one of the output ports of the wavelength assignment 1 × N2 WSS 104. In this configuration, before setting the target optical path, the wavelength that is not branched is set to connect to the output port to which the PD 108 is connected, and the PD 108 receives the optical signal. It is confirmed that the corresponding optical path signal is not input to the input of the 1xN2 WSS 104 for wavelength allocation.

  In the case of using the configuration of FIG. 6, the procedure at the time of optical path establishment and deletion at the receiving node is partially different from the procedure in the case of using the configuration shown in FIG.

  FIG. 7 shows the procedure at the receiving node when setting the optical path. In the state where the optical path signal is not set, the corresponding wavelength is connected to the port connected to the PD 108 in the 1xN2 WSS 104 for wavelength allocation. Therefore, the following procedure is performed at the receiving node.

  Step 6) (Reception node) Confirm that there is no optical power in the PD. If this is confirmed, it is equivalent to no optical path signal being input to the 1xN2 WSS 104 for wavelength allocation. The subsequent procedure is the same as that after step 7 in FIG.

  Step 7) (Reception node) Drop setting of 1xN2 WSS 104 for wavelength allocation is performed. Here, since the corresponding wavelength is already set in the PD 108 port, the setting is made to switch the wavelength from the PD 108 port to the target transponder 106 port.

  Step 8) (Reception node) Drop setting of the 1xN1 WSS 102 for route switching is performed.

  Step 9) (Reception node) The light reception confirmation of the transponder 106 is performed.

  FIG. 8 shows an optical path deletion procedure.

  Step 1) (Reception node) Drop setting deletion of the route switching 1xN1 WSS 102 is performed in the same manner as in Step 1 of FIG.

  Step 2) (Reception Node) In this example, since there is no OCM 107, it is confirmed that the transponder 106 has not received an optical signal as confirmation of the presence / absence of an input signal to the wavelength assignment 1 × N2 WSS 104.

  Step 3) (Reception node) Drop setting is deleted in the 1xN2 WSS 104 for wavelength allocation. In this example, when the optical path is not set, the wavelength that is not branched is connected to the port connected to the PD 108. Therefore, the setting here is a setting for switching the connection of the corresponding wavelength from the port for the transponder 106 to the port for the PD 108.

By performing the optical path setting and the optical path deletion by the above procedure, it is possible to confirm the presence / absence of the optical path signal by using an inexpensive device including only the PD 108 without using the OCM 107. That is, by using the configuration of FIG. 6 and setting and deleting the optical path in the procedure of FIGS. 7 and 8 without using the OCM 107, the 1xN2 WSS 104 for wavelength allocation is erroneously transmitted to the 1xN2 WSS 104 for wavelength allocation. Even when a path signal is input, the wavelength assignment 1 × N2 WSS 104 is set, and the effect of preventing other optical path signals from being affected is obtained.
(Example 3)
Next, Example 3 will be described. FIG. 9 shows a configuration of an optical node 300 used in the third embodiment. FIG. 9 shows an optical node configuration having a colorless function with the number of routes M, and shows a configuration different from FIG. The configuration shown in FIG. 9 is different from FIG. 3 in that an optical shunt 301 is used instead of the path switching 1 × N1 WSS 102 in FIG. Further, in this configuration, it is necessary to use the N1 × 1 WSS 103 for route switching, and it cannot be substituted for the optical combiner. Here, an optical coupler is generally used as the optical shunt and the optical multiplexer. FIG. 10 shows a configuration of the optical node 300 in which the number of routes M in the configuration of FIG.
FIG. 11 shows an optical path opening procedure in the third embodiment. This optical path opening procedure is applicable not only to the configurations of FIGS. 9 and 10, but also to the configuration of FIG. 11, procedures that exist only in the configuration of FIG. 3 and do not exist in the configurations of FIGS. 9 and 10 are surrounded by a dotted frame. Further, in the procedure of FIG. 11, Step 2 can be omitted when an optical multiplexer is used instead of the wavelength assignment N2 × 1 WSS105.

  As described above, when setting the optical path, the setting is basically performed from the upstream device for stability. Specifically, it is as follows.

  Step 1) (Transmission node) The transponder 106 is caused to emit light.

  Step 2) (Transmission node) Add setting of N2x1 WSS 105 for wavelength allocation.

  Step 3) (Transmission node) Add setting of the route switching N1 × 1 WSS 103 is performed.

  Step 4) (Relay node configured as shown in FIG. 3) The through setting of the route switching 1 × N1 WSS 102 is performed.

  Step 5) (Reception node having the configuration of FIG. 3) Drop setting of the 1xN1 WSS 102 for route switching is performed.

  Step 6) (Reception node) Confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation.

  Step 7) (Reception Node) If there is no optical path signal of the corresponding wavelength in step 6, drop setting of the 1xN2 WSS 104 for wavelength allocation is performed.

  Step 8) (Relay node) N1 × 1 WSS 103 for route switching is set through. However, the relay node that performs the through setting of the route switching N1 × 1 WSS 103 in step 8 is the relay node immediately before the receiving node.

  Step 9) (Reception node) The transponder 106 confirms whether light is received.

  As described above, only the setting of the N1x1 WSS 103 for route switching at the relay node immediately before the receiving node is performed after the setting of the 1xN2 WSS 104 for wavelength allocation of the receiving node in Step 7. By setting in this way, the 1xN2 WSS 104 for wavelength allocation can set an optical path in a state where no optical path signal is input, and it has no effect on other optical path signals even without a hitless function. The optical path can be set without affecting the above. Also, after confirming in step 6 that there is no optical path signal at the input of the wavelength assignment 1xN2 WSS 104 using the OCM 107 or the like, in step 7, by setting the wavelength assignment 1xN2 WSS 104 of the receiving node, for some reason. Even if an optical path signal is input to the 1xN2 WSS 104 for wavelength allocation, it is possible to prevent the optical path setting from being erroneously performed and affecting other optical path signals.

  Here, the stability of WSS negative feedback control will be described. In this procedure, the WSS on the upstream side is set after the WSS setting on the downstream side, but there is only one WSS downstream of the upstream WSS to be set, so the unstable operation of negative feedback control for output level adjustment This procedure is a procedure with excellent stability of negative feedback control.

  Next, an optical path deletion procedure according to the third embodiment will be described with reference to FIG.

  Step 1) (Relay node) Delete the through setting of the N1 × 1 WSS 103 for route switching. However, the relay node that deletes the through setting of the route switching N1 × 1 WSS 103 in Step 1 is the relay node immediately before the receiving node.

  Step 2) (Reception node) Confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation.

  Step 3) (Receiving node) If there is no corresponding optical path signal in Step 2, drop setting deletion of the 1xN2 WSS 104 for wavelength allocation is performed.

  Step 4) (Receiving node having the configuration of FIG. 3) Drop setting deletion of the route switching 1xN1 WSS 102 is performed.

  Step 5) (Relay node configured as shown in FIG. 3) Delete the through setting of the route switching 1 × N1 WSS102.

  Step 6) (Sending node) Delete the Add setting of the N1 × 1 WSS 103 for route switching.

  Step 7) (Transmission node) Add setting deletion of N2x1 WSS 105 for wavelength allocation is performed.

  Step 8) (Transmission node) The transponder 106 is extinguished.

  As described above, in this embodiment as well, the setting is basically performed from the downstream device for stability. However, before the 1xN2 WSS-Drop setting for wavelength allocation in step 3 is deleted in the receiving node, the reception is performed. The route switching N1x1 WSS-Thru setting is to be deleted in the node immediately before the node (step 1). By performing the deletion setting in this way, it is possible to set the optical path signal when the optical path setting of the 1xN2 WSS 104 for wavelength allocation is deleted without inputting an optical path signal, and to other optical path signals even without a hitless function. The optical path can be deleted without affecting the above. In addition, before deleting the 1xN2 WSS -Drop setting for wavelength allocation in Step 3, confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation in Step 2 by using an OCM 107 or the like. Therefore, even if an optical path signal is input to the 1xN2 WSS 104 for wavelength allocation, it is possible to prevent the optical path setting from being deleted by mistake and affecting other optical path signals.

  Here, the stability of WSS negative feedback control will be described. In this procedure, the upstream WSS settings are deleted after the upstream WSS settings are deleted. However, because there is only one WSS downstream from the upstream WSS to be deleted, negative feedback control for output level adjustment is required. The unstable operation is difficult to occur, and this procedure is also excellent in the stability of the negative feedback control.

As described above, in the node configurations of FIGS. 3, 9, and 10, by performing the path opening procedure and the path deleting procedure of FIGS. 11 and 12, the optical path is not affected without affecting other optical path signals. Setting and deletion can be performed. In addition, according to this method, there is an advantage that an optical node can be realized at low cost without the need for new parts for realizing the hitless function.
(Example 4)
Next, as a fourth embodiment, a path opening procedure and a path deleting procedure different from those in the third embodiment in the configurations of FIGS. 3, 9, and 10 will be described.
First, the path opening procedure in the fourth embodiment will be described with reference to FIG. In FIG. 13, procedures that exist only in the configuration of FIG. 3 and do not exist in the configurations of FIGS. 9 and 10 are surrounded by a dotted frame. In the procedure of FIG. 13, step 2 can be omitted when an optical multiplexer is used instead of the wavelength assignment N2 × 1 WSS105.

  Step 1) (Transmission node) The transponder 106 is caused to emit light.

  Step 2) (Transmission node) Add setting of N2x1 WSS 105 for wavelength allocation.

  Step 3) (Transmission node) Add setting of the route switching N1 × 1 WSS 103 is performed.

  Step 4) (Relay node configured as shown in FIG. 3) The through setting of the route switching 1 × N1 WSS 102 is performed.

  Step 5) (Relay node) Set the through of the N1 × 1 WSS 103 for route switching.

  Step 6) (Reception node having the configuration of FIG. 3) Drop setting of the 1xN1 WSS 102 for route switching is performed. In addition, the receiving node transmits a shutdown request for the set optical path to the relay node. This relay node is a relay node immediately before the receiving node. Note that control signals related to shutdown setting and shutdown setting cancellation may be transmitted from the NW management control device.

  Step 7) (Relay Node) The relay node that has received the shutdown request performs a shutdown setting so that the optical path signal is not sent downstream.

  Step 8) (Reception node) Confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation.

  Step 9) (Reception Node) If there is no optical path signal of the corresponding wavelength in step 8, drop setting of the 1xN2 WSS 104 for wavelength allocation is performed. In addition, the receiving node transmits a shutdown cancellation request to the relay node that has been set for shutdown.

  Step 10) (Relay Node) The relay node that has received the shutdown release request releases the shutdown and sends an optical path signal downstream.

Step 11) (Reception node) The transponder 106 confirms whether light is received.
In the procedure of FIG. 13 as well, the setting is basically performed from the upstream device for stability. However, before setting the wavelength allocation 1xN2 WSS 104 of the receiving node in step 9, the relay node one before the receiving node is set. To the N1x1 WSS 103 for switching the route of the immediately preceding relay node is set to a shutdown state (signal disconnection state). By setting in this way, the 1xN2 WSS 104 for wavelength allocation can set the optical path in the state where the optical path signal is not input, and even if there is no hitless function, it affects other optical path signals. The optical path can be set without affecting the above. After the setting of the 1xN2 WSS for wavelength allocation is completed, a control signal is sent to the upstream node again to cancel the shutdown of the N1x1 WSS 103 for route switching. In addition to this method, after confirming that there is no optical path signal at the input of the wavelength assignment 1xN2 WSS 104 in step 8 by the OCM 107 or the like, in step 9, the wavelength assignment 1xN2 WSS 104 is set. Even if an optical path signal is input to the wavelength assignment 1 × N2 WSS 104 for some reason, it is possible to prevent an optical path from being set by mistake and affecting other optical path signals.
Here, the stability of WSS negative feedback control will be described. In this procedure, the WSS on the upstream side is set after the WSS setting on the downstream side, but there is only one WSS downstream of the upstream WSS to be set, so the unstable operation of negative feedback control for output level adjustment This procedure is a procedure with excellent stability of negative feedback control.

  Next, an optical path deletion procedure according to the fourth embodiment will be described with reference to FIG.

  Step 1) (Relay Node) First, the optical path signal is set to be shut down at the relay node immediately before the receiving node.

  Step 2) (Reception node) Confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation.

  Step 3) (Receiving node) If there is no corresponding optical path signal in Step 2, drop setting deletion of the 1xN2 WSS 104 for wavelength allocation is performed.

  Step 4) (Receiving node having the configuration of FIG. 3) Drop setting deletion of the route switching 1xN1 WSS 102 is performed.

  Step 5) (Relay node) Delete the through setting of the route switching N1 × 1 WSS103.

  Step 6) (Relay node having the configuration of FIG. 3) Delete the through setting of the route switching 1 × N1 WSS102.

  Step 7) (Transmission node) The N1 × 1 WSS 103 for route switching is deleted.

  Step 8) (Transmission node) Add setting deletion of wavelength allocation N2x1 WSS 105 is performed.

  Step 9) (Transmission node) The transponder 106 is extinguished.

  Even in the fourth embodiment, the setting is basically performed from the downstream device for stability, but before the wavelength allocation 1xN2 WSS-Drop setting is deleted in step 3 in the receiving node, one setting is made from the receiving node. A control signal is sent to the preceding relay node, and control is performed so that the route switching N1x1 WSS 103 of the relay node is changed to the shutdown state. By performing the deletion setting in this way, it is possible to perform the setting in the state where the optical path signal is not input when deleting the optical path setting of the 1xN2 WSS 104 for wavelength allocation, and even if there is no hitless function, other optical path signals can be set. The optical path can be deleted without affecting the optical path. In addition, before deleting the 1xN2 WSS-Drop setting for wavelength assignment in step 3, confirm that there is no optical path signal at the input of the 1xN2 WSS104 for wavelength assignment in step 2 by some reason. Therefore, even if an optical path signal is input to the 1xN2 WSS 104 for wavelength allocation, it is possible to prevent the optical path setting from being deleted by mistake and affecting other optical path signals.

  Here, the stability of WSS negative feedback control will be described. Even in this procedure, the upstream WSS settings are deleted after the upstream WSS settings are deleted. However, since there is only one WSS downstream of the upstream WSS to be deleted, negative feedback for output level adjustment is required. It is difficult for unstable control operations to occur, and this procedure is also excellent in the stability of negative feedback control.

  As described above, in the node configurations of FIGS. 3, 9, and 10, by performing the path opening procedure and the path deleting procedure of FIGS. 13 and 14, the optical path is not affected without affecting other optical path signals. Setting and deletion can be performed. Compared with the path opening procedure and the path deleting procedure shown in FIGS. 11 and 12, in this method, the NW management controller starts from the upstream node when the optical path is opened, and from the downstream node when the optical path is deleted. Therefore, the NW management control device has a feature that does not require a complicated procedure.

(Example 5)
Next, a path opening procedure and a path deleting procedure different from those in the third and fourth embodiments in the configurations of FIGS.
With reference to FIG. 15, the optical path opening procedure in Example 5 is demonstrated. 15, procedures that exist only in the configuration of FIG. 3 and do not exist in the configurations of FIG. 9 and FIG. 10 are surrounded by a dotted frame. Further, in the procedure of FIG. 11, when an optical multiplexer is used instead of the wavelength assignment N2 × 1 WSS 105, step 4 can be omitted.

  Step 1) (Receiving node) Confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation.

  Step 2) (Receiving node) If there is no optical path signal of the corresponding wavelength in Step 1, drop setting of the 1xN2 WSS 104 for wavelength allocation is performed.

  Step 3) (Transmission node) The transponder 106 is caused to emit light.

  Step 4) (Transmission node) Add setting of N2x1 WSS 105 for wavelength allocation.

  Step 5) (Transmission node) Add setting of the route switching N1 × 1 WSS 103 is performed.

  Step 6) (Relay node having the configuration of FIG. 3) The through setting of the route switching 1 × N1 WSS 102 is performed.

  Step 7) (Relay node) N1 x 1 WSS 103 for route switching is set through.

  Step 8) (Reception node having the configuration of FIG. 3) Drop setting of the 1xN1 WSS 102 for route switching is performed.

Step 9) (Reception node) The transponder 106 confirms whether light is received.
In the procedure of FIG. 15 as well, the setting is basically performed from the upstream device for stability, but the feature is that the 1xN2 WSS 104 for wavelength allocation of the receiving node is set as step 2 at the beginning of all the procedures. . By setting in this way, the 1xN2 WS104 for wavelength allocation can set the optical path in the state where the optical path signal is not input, and even if there is no hitless function, it affects other optical path signals. The optical path can be set without affecting the above. In addition to this method, after confirming in step 1 that there is no optical path signal at the input of the wavelength assignment 1xN2 WSS 104 using the OCM 107 or the like, in step 2, the setting of the wavelength assignment 1xN2 WSS 104 of the receiving node is performed. Even if an optical path signal is input to the 1xN2 WSS 104 for wavelength allocation for some reason, it is possible to prevent the optical path setting from being erroneously performed and affecting other optical path signals.
Here, the stability of WSS negative feedback control will be described. Also in this procedure, the WSS on the upstream side is set after the WSS setting on the downstream side. However, since there is only one WSS downstream of the upstream WSS to be set, negative feedback control for output level adjustment is not possible. Stable operation is unlikely to occur, and this procedure is also excellent in the stability of negative feedback control.

  Next, a procedure for deleting an optical path in the fifth embodiment will be described with reference to FIG.

  Step 1) (Receiving node having the configuration shown in FIG. 3) The Drop setting of the 1xN1 WSS 102 for route switching is deleted.

  Step 2) (Relay node) Delete the through setting of the N1 × 1 WSS 103 for route switching.

  Step 3) (Through relay node of FIG. 3) Delete the through setting of the route switching 1 × N1 WSS102.

  Step 4) (Transmission node) The N1 x 1 WSS 103 for switching the route is deleted.

  Step 5) (Transmission node) Add setting deletion of N2x1 WSS 105 for wavelength allocation is performed.

  Step 6) (Transmission node) The transponder 106 is extinguished.

Step 7) (Reception node) Confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation.
Step 8) (Reception node) If there is no corresponding optical path signal in Step 7, drop setting deletion of the wavelength allocation 1 × N2 WSS 104 is performed.

  In this case as well, the setting is basically performed from the downstream device for stability, but the feature is that the 1xN2 WSS -Drop setting for wavelength allocation at the receiving node in step 8 is deleted at the end of all. . By performing the deletion setting in this way, it is possible to set the optical path signal when the optical path setting of the 1xN2 WSS 104 for wavelength allocation is deleted without inputting an optical path signal, and to other optical path signals even without a hitless function. The optical path can be deleted without affecting the above. In addition, before deleting the 1xN2 WSS-Drop setting for wavelength allocation in step 8, it is necessary to confirm that there is no optical path signal at the input of the 1xN2 WSS 104 for wavelength allocation in step 7 by OCM107 etc. Therefore, even if an optical path signal is input to the 1xN2 WSS 104 for wavelength allocation, it is possible to prevent the optical path setting from being deleted by mistake and affecting other optical path signals.

  Here, the stability of WSS negative feedback control will be described. Even in this procedure, the upstream WSS settings are deleted after the upstream WSS settings are deleted. However, since there is only one WSS downstream of the upstream WSS to be deleted, negative feedback for output level adjustment is required. It is difficult for unstable control operations to occur, and this procedure is also excellent in the stability of negative feedback control.

  As described above, in the node configurations of FIGS. 3, 9, and 10, by performing the path opening procedure and the path deleting procedure of FIGS. 15 and 16, the optical path is not affected without affecting other optical path signals. Setting and deletion can be performed.

(Example 6)
Next, Example 6 will be described. FIG. 17 shows the configuration of the optical node 400 used in the sixth embodiment. 18 is an example in which M is 2 in the optical node 400 of FIG.

  FIG. 17 shows an optical node configuration having a colorless function with the same number of routes M as in FIG. 9, but the means for checking the presence or absence of an optical path signal at the input of the 1 × N2 WSS 104 for wavelength allocation is different. In FIG. 17, instead of the OCM 107 in FIG. 9, means for measuring the power of the PD 108 or the like is connected to one of the output ports of the wavelength assignment 1 × N2 WSS 104. In the switching between the state in which the path setting is not performed and the state of connection to the port connected to the PD 108, the selection is made in a combination that does not leak signals to other ports. For example, when the path is not set, there is a method of connecting to a port adjacent to the port connected to the PD 108. Then, when confirming whether or not an optical path signal is input to the 1xN2 WSS 104 for wavelength allocation, connect the corresponding wavelength to the output port to which the PD 108 is connected, and confirm the presence or absence of the optical signal in the PD 108 This makes it possible to confirm whether or not an optical path signal has been input to the 1xN2 WSS for wavelength allocation.

  In the case of using the configurations of FIGS. 17 and 18, the procedures at the time of optical path establishment and deletion at the receiving node are partly different from the procedures when the configurations shown in FIGS. 3, 9 and 10 are used.

  FIG. 19 is a diagram showing a procedure for confirming whether or not an optical path signal is input to the wavelength assignment 1 × N2 WSS 104 at the receiving node at the time of path setting.

  Step 1) (Reception node) In the 1xN2 WSS 104 for wavelength allocation, setting is performed to connect the corresponding wavelength to the output port to which the PD 108 is connected.

  Step 2) (Reception node) Confirm that there is no optical signal power in the PD 108.

  Step 3) (Reception node) Drop setting of 1xN2 WSS 104 for wavelength allocation is performed.

  At the time of path setting, procedures J, F, and G in FIG. 19 are used instead of procedures F and G in FIGS. 11, 13, and 15.

  FIG. 20 is a diagram illustrating a procedure when a path is deleted.

  Step 1) (Reception node) The transponder 106 confirms that no optical signal is received.

  Step 2) (Receiving node) Delete Drop setting of 1xN2 WSS 104 for wavelength allocation.

  At the time of path deletion, procedures B and C in FIG. 20 are changed instead of procedures B and C in FIGS. 12, 14, and 16.

By performing the optical path setting and the optical path deletion as described above, it is possible to confirm the presence / absence of the optical path signal by using an inexpensive device including only the PD 108 without using the OCM 107. That is, by setting and deleting the optical path according to the procedure of FIGS. 19 and 20 in the configuration of FIGS. 17 and 18 without using the OCM 107, an optical path signal is erroneously sent to the wavelength assignment 1 × N2 WSS 104 due to some failure factor. Even when the signal is input, the wavelength allocation 1 × N2 WSS 104 is set, and the effect of preventing other optical path signals from being affected is obtained.
(Example 7)
Next, Example 7 will be described. FIG. 21 shows the configuration of an optical node 500 with M routes used in the seventh embodiment.

  As shown in FIG. 21, the optical node 500 includes a route switching 1 × N3 WSS 501 and a route switching N3 × 1 WSS 502, and does not include the wavelength allocation 1 × N2 WSS 104. An optical coupler such as an optical coupler may be used instead of the route switching N3x1 WSS502. Here, by increasing the value of N3, it is possible to increase the number of routes or increase the number of branch insertion ports having a colorless function. In this embodiment, in this configuration, a WSS having no hitless function is used as the route switching 1 × N3 WSS 501.

  An example of an optical path opening procedure in the case of the node configuration of FIG. 21 is shown in FIG. However, FIG. 22 shows an example of an optical path setting procedure when the optical combiner is used without using the route switching N3 × 1 WSS 501. In this embodiment, since there is a route switching 1xN3 WSS 501 in all the relay nodes on the photonic NW that sets the optical path, the example in FIG. 22 indicates that the relay nodes are sequentially set from the downstream side. For this purpose, two relay nodes are shown.

  Step 1) (Reception node) Drop setting of 1xN3 WSS 501 for route switching is performed.

  Step 2) (Relay node) Perform through setting of 1xN3 WSS 501 for route switching.

  Step 3) (Relay node) Perform through setting of 1xN3 WSS 501 for route switching.

  Step 4) (Transmission node) The transponder 106 is caused to emit light.

  Step 5) (Reception node) The transponder 106 confirms whether light is received.

  In the optical path setting procedure in the node configuration of FIG. 21, after setting the route switching 1xN3 WSS 501 in each node, setting the upstream route switching 1xN3 WSS 501 or the route switching N3x1 WSS 502 (for route switching) N3x1 WSS502 is used) or the transponder 106 emits light. By performing the setting in this way, the path switching 1xN3 WSS 501 in each node can set the optical path in a state where no optical path signal is input, and other optical path signals can be provided even without the hitless function. The optical path can be set without affecting the above.

  An example of an optical path deletion procedure in the case of the node configuration of FIG. 21 will be described with reference to FIG.

  Step 1) (Transmission node) The transponder 106 is extinguished.

  Step 2) (Relay node) Delete the through setting of the route switching 1xN3 WSS501.

  Step 3) (Relay node) Delete the through setting of the route switching 1xN3 WSS501.

  Step 4) (Reception node) Drop setting deletion of 1xN3 WSS501 for route switching is performed.

  In the optical path deletion procedure, before setting the route switching 1xN3 WSS 501 at each node, the upstream route switching 1xN3 WSS 501 or the route switching N3x1 WSS 502 is deleted or the transponder 106 is extinguished. To. By deleting the settings in this way, each node can be set in a state where the optical path signal is not input when the optical path setting of the 1xN3 WSS 501 for path switching is deleted, and there is no hitless function. However, the optical path can be deleted without affecting other optical path signals.

  In the seventh embodiment, similarly to the fifth and sixth embodiments, the path switching 1xN3 WSS 501 can be set after the presence or absence of the optical path signal is confirmed. That is, in the configuration shown in FIG. 21, before setting the route switching 1xN3 WSS 501, the OCM 107 is used to check the presence / absence of an optical path signal at the input of the route switching 1xN3 WSS 501. After confirming that there is no path signal, the route switching 1xN3 WSS 501 is set.

  Further, instead of connecting the OCM 107 as shown in FIG. 21, as shown in FIG. 24, a configuration in which a PD 108 for measuring optical power is connected to one of the output ports of each path switching 1xN3 WSS 501 may be adopted. In this case, before setting the 1xN3 WSS 501 for route switching, the connection destination of the wavelength of the optical path signal to be set is set to the output port connected to the PD 108, and the PD 108 After confirming that there is no path signal, the route switching 1xN3 WSS 501 is set.

  Further, in both cases of FIG. 21 and FIG. 24, when an optical path is deleted, it is confirmed that there is no optical path signal in the transponder 106 of the receiving optical node before setting the 1xN3 WSS for route switching. After that, the setting of the route switching 1xN3 WSS 501 is performed.

  As described above, the presence / absence of the optical path signal is confirmed by the OCM 107, the PD 108, and the transponder 106. Even if the optical path signal is input to the 1xN3 WSS 501 for route switching for any reason, the optical path signal is erroneously It is possible to prevent the path setting / optical path setting deletion from affecting other optical path signals.

  The present invention can be applied to optical path setting in a photonic network composed of a plurality of ROADM nodes.

  The present invention is not limited to the above-described embodiments, and various modifications and applications are possible within the scope of the claims.

1 Optical amplifier 2 Transponder 3 Optical coupler 4 1x9 WSS
5 9x1 WSS
10 Multi-degree ROADM nodes 100, 200, 300, 400, 500, 600 Optical node 101 Optical amplifier 102 1 x N1 WSS for path switching
103 N1 x 1 WSS for route switching
104 1xN2 WSS for wavelength assignment
105 N2 x 1 WSS for wavelength assignment
106 transponder 106
107 OCM (Optical Channel Monitor)
108 PD
301 1xN3 WSS for diverter 501 route switching
502 N3x1 WSS for route switching

Claims (8)

1xN1 WSS for route switching that selects the signal light of the received WDM signal in units of wavelength and outputs it to the output route side or branch side, and a transponder that receives the WDM signal branched from the 1xN1 WSS for route switching An optical path setting method in an optical node system including an optical node having a 1xN2 WSS for wavelength allocation without a hitless function to be connected as a receiving optical node,
When setting the optical path from the transmitting optical node to the receiving optical node, after setting the wavelength allocation 1xN2 WSS, set the path switching 1xN1 WSS, or delete the optical path In this case, after setting the route switching 1xN1 WSS, the wavelength allocation 1xN2 WSS is set. Selects an optical path signal to be transmitted to the next optical node in wavelength units from WDM signals received from other optical nodes, and combines the selected optical path signal with the optical path signal to be inserted. An optical node having an N1x1 WSS and a 1xN2 WSS for wavelength allocation without hitless function that connects to a transponder that receives the signal light of the WDM signal received from another optical node in units of wavelengths, the receiving optical node and the upstream optical An optical path setting method in an optical node system provided as a node,
When setting the optical path from the transmitting optical node to the receiving optical node, after setting the wavelength allocation 1xN2 WSS in the receiving optical node, the path switching N1x1 WSS of the upstream optical node When setting or deleting the optical path, after setting the path switching 1xN1 WSS of the upstream optical node, setting the wavelength allocation 1xN2 WSS in the receiving optical node An optical path setting method characterized by the above. Selects an optical path signal to be transmitted to the next optical node in wavelength units from WDM signals received from other optical nodes, and combines the selected optical path signal with the optical path signal to be inserted. An optical node having an N1x1 WSS and a 1xN2 WSS for wavelength allocation without hitless function that connects to a transponder that receives the signal light of the WDM signal received from another optical node in units of wavelengths, the receiving optical node and the upstream optical An optical path setting method in an optical node system provided as a node,
When setting the optical path from the transmitting optical node to the receiving optical node, or when deleting the optical path, before setting the 1xN2 WSS for wavelength allocation in the receiving optical node, the upstream optical An optical path setting method, comprising: stopping output of an optical path signal set in the node switching N1x1 WSS of the node. Selects an optical path signal to be transmitted to the next optical node in wavelength units from WDM signals received from other optical nodes, and combines the selected optical path signal with the optical path signal to be inserted. An optical node having an N1x1 WSS and a 1xN2 WSS for wavelength allocation without hitless function that connects to a transponder that receives the signal light of the WDM signal received from another optical node in units of wavelengths, the receiving optical node and the upstream optical An optical path setting method in an optical node system provided as a node,
When setting the optical path from the transmission optical node to the reception optical node, after setting the wavelength allocation 1xN2 WSS in the reception optical node, the transponder emits light in the transmission optical node, or the optical An optical path setting method comprising: setting a wavelength allocation 1xN2 WSS in the receiving optical node after quenching a transponder in the transmitting optical node when deleting a path. An optical node with 1xN3 WSS for route switching without hitless function that selects the signal light of the received WDM signal by wavelength unit and outputs it to the output route side or branch side, the receive optical node and the upstream optical node An optical path setting method in an optical node system provided as
When setting the optical path from the transmitting optical node to the receiving optical node, after setting the path switching 1xN3 WSS in the receiving optical node, the path switching 1xN3 WSS in the upstream optical node Or before setting the route switching 1xN3 WSS in the receiving optical node when the route switching N3x1 WSS is set, or the transponder emits light in the transmitting optical node or the optical path is deleted In addition, the path switching 1xN3 WSS or the path switching N3x1 WSS of the upstream optical node or the transponder extinction of the transmitting optical node is performed. In the optical path setting method,
Before setting the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching, monitor the presence of the optical path signal at the input of the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching. 6. The wavelength allocation 1xN2 WSS or the path switching 1xN3 WSS is set after confirming that there is no optical path signal in the monitor. The optical path setting method according to any one of the above. In the optical path setting method,
Connect a monitor that measures optical power to one of the output ports of the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching,
At the time of setting the optical path, before setting the 1xN2 WSS for wavelength allocation or the 1xN3 WSS for path switching, the connection destination of the wavelength of the optical path signal to be set is connected to the monitor. The wavelength allocation 1xN2 WSS or the path switching 1xN3 WSS is set after confirming that there is no optical path signal by the monitor, and setting the output port. Item 6. The optical path setting method according to any one of Items 1 to 5. In the optical path setting method,
At the time of deleting the optical path, before setting the wavelength allocation 1xN2 WS or the path switching 1xN3 WSS, after confirming that there is no optical path signal in the transponder of the receiving optical node, The optical path setting method according to any one of claims 1 to 5, wherein setting of 1xN2 WSS for wavelength allocation or 1xN3 WSS for path switching is performed.

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