JP5504183B2 - Optical subsystem and optical subsystem control method - Google Patents

Description

  The present invention relates to an optical subsystem constituting an optical node in a photonic network.

  FIG. 1 shows a configuration example of a conventional photonic NW (Network). As shown in FIG. 1, the photonic NW is composed of an optical fiber that connects a plurality of optical nodes and optical nodes (see, for example, Non-Patent Document 1).

  When a client signal is transferred via the photonic NW, the client signal is converted into an optical signal in the optical node that transmits the signal, and the converted optical signal is transmitted from the transmitting optical node to the optical node that receives the optical signal. Transfer and convert the optical signal to the 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 shown in FIG. 1, a ROADM (Reconfigurable Optical Add / Drop Multiplexer) node is used as an optical node. The ROADM node branches and inserts an optical path signal in wavelength units from a wavelength division multiplexing (WDM) signal transferred from an adjacent ROADM node, and transfers the WDM signal to another adjacent ROADM node. It is a node that enables The ROADM node includes a 2-degree ROADM connectable to two adjacent ROADM nodes and a multi-degree ROADM connectable to three or more adjacent ROADM nodes. With these ROADM nodes, a ring NW, a multi-ring NW, and a mesh NW can be constructed. 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. As shown in FIG. 2, the multi-degree ROADM node transmits to an adjacent node or transmits an optical amplifier that amplifies a WDM signal received from the adjacent node, and converts a client signal into an optical path signal for transmission. And an optical path switching means for switching the path of the optical path signal.

  In the configuration example shown in FIG. 2, an optical coupler, 1 × 9 WSS, and 9 × 1 WSS are used as an optical path switching unit that switches a path of an optical path signal. Here, WSS (Wavelength Selective Switch: wavelength selection switch) is a switch that can input / output WDM signals in each input / output port and select an input / output port to be connected in wavelength units as a switch function. A WSS having 1 input port and 9 output ports is 1 × 9 WSS, and a WSS having 9 input ports and 1 output port is 9 × 1 WSS.

  The configuration example shown in FIG. 2 includes a colorless function that allows an optical path signal of an arbitrary wavelength to be transmitted by a transmitter and an optical path signal of an arbitrary wavelength to be received by a receiver. As the configuration of the optical node, in addition to the configuration shown in FIG. 2, a ROADM node without a colorless function and a 2-degree ROADM node have been reported.

E. Bert. Basch, et. al, “Architecture Tradeoffs for Reconfigurable Sense Wavelength-Division Multiplexing Systems”, IEEE J. of selected topics in Quantum electronics. Vol. 12, no. 4, JULY / AUGUST 2006

  An optical node manufacturer may produce optical nodes by in-house production of optical components such as optical amplifiers, transceivers, and optical switches that serve as optical path switching means. The optical node is manufactured by receiving an optical component necessary for the configuration of the optical node or an optical subsystem combining a plurality of optical components. However, this optical subsystem has to be designed and manufactured to have different management control functions depending on the combination of optical components to be used, even when ROADM nodes having the same function are manufactured. Specifically, in the configuration shown in FIG. 2, it is possible to use WSS instead of an optical coupler. In this case, however, an optical path switching control function that was not necessary for an optical coupler that is a passive component is added. As a result, it is necessary to fabricate an optical subsystem having different management control functions. In the configuration shown in FIG. 2, the function of the optical coupler and 1 × 9 WSS can be replaced with 1 × N (N is an integer of 10 or more) WSS. In this case, the optical path signal is transferred to the other path. It is necessary to integrate the control of the optical switch to be connected and the control of the optical switch to be connected to the transceiver of the own node. As a result, it is necessary to produce an optical subsystem having different management control functions. That is, in order to cope with the illustrated combination of optical components, it is necessary to provide an optical subsystem having a total of three different management control functions.

  Thus, conventionally, even when creating ROADM nodes with the same function, it is necessary to individually design and manufacture optical subsystems having different management control functions according to the combination of optical components to be used. There was a problem that development required enormous costs and a long time.

  Therefore, in order to solve the above-described problems, the present invention eliminates the need for individual design and manufacture even if the combination of optical components to be used is changed, and provides an optical subsystem and an optical subsystem that are short in development period and low in cost. An object is to provide a control method.

  In order to achieve the above object, the optical subsystem and the optical subsystem control method according to the present invention separate the management control function into logical control and physical control.

Specifically, the optical subsystem according to the present invention is:
A branch switch having one input port and a plurality of output ports;
A merge switch having one output port and a plurality of input ports;
A logical control function,
A physical control function unit;
An optical subsystem comprising:
The logical control function unit includes:
When there is an optical path setting request in the logical control function unit, determine whether or not the optical path setting request is possible with reference to a connection state transition diagram regarding the connection of the branch switch and the junction switch,
When optical path setting is possible, the optical path setting request is transmitted to the physical control function unit,
The physical control function unit
When the optical path setting request is received from the logical control function unit, a combination that can be connected between the input port and the output port of the branch switch and the output port and the input port of the junction switch is described. Referring to a logical information table and a physical information table that describes physical information of the branch switch and the merging switch, physical configuration conversion is performed on the optical path setting request, and whether or not the branch switch and the merging switch can be set. And
When the switch setting is possible, the switch setting is transmitted to a driver of the branch switch and the merge switch to drive the branch switch and the merge switch.

An optical subsystem control method according to the present invention includes:
A branch switch having one input port and a plurality of output ports;
A merge switch having one output port and a plurality of input ports;
A logical control function,
A physical control function unit;
An optical subsystem control method for an optical subsystem comprising:
When there is an optical path setting request in the logical control function unit, the logical control function unit determines whether or not the optical path setting request is possible with reference to a connection state transition diagram regarding the connection of the branch switch and the junction switch. Judgment,
When optical path setting is possible, the logical control function unit transmits the optical path setting request to the physical control function unit,
The logical control function unit that has received the optical path setting request describes a combination that can be connected between the input port and the output port of the branch switch and the output port and the input port of the junction switch. Physical configuration conversion is performed on the optical path setting request with reference to an information table and a physical information table describing physical information of the branch switch and the junction switch, and whether or not the branch switch and the junction switch can be set. Judgment,
When the switch setting is possible, the physical control function unit transmits the switch setting to a driver of the branch switch and the merge switch to drive the branch switch and the merge switch.

  Even an optical subsystem combining the same optical components can support various optical path settings, monitoring settings, light intensity control, and operation mode changes by changing the settings in the logical information table and physical information table. it can. Since the optical subsystem can be a combination of the same optical components, the cost and time required for designing and manufacturing can be reduced.

  Therefore, the present invention can provide an optical subsystem and an optical subsystem control method that require a short development period and low cost without the need to individually design and manufacture even if the combination of optical components to be used changes. .

An optical subsystem according to the present invention includes:
A branch switch having one input port and a plurality of output ports;
A merge switch having one output port and a plurality of input ports;
A logical control function,
A physical control function unit;
An optical level monitor disposed on each of the input port of the branch switch, at least M output ports of the branch switch, the output port of the junction switch, and at least M input ports of the junction switch; ,
An optical subsystem comprising:
The logical control function unit includes:
When there is an optical signal level monitor request, refer to the connection state transition diagram relating to the connection of the branch switch and the junction switch and the optical level state transition diagram of the optical signal level monitor point of the optical signal level monitor request. Determine whether a signal level monitor request is possible,
If optical signal level monitoring is possible, send the optical signal level monitor request to the physical control function unit,
The physical control function unit
A combination that is connectable between the input port and the output port of the branch switch and the output port and the input port of the junction switch when the optical signal level monitor request is received from the logical control function unit. A physical configuration conversion is performed on the optical signal level monitor request with reference to the logical information table and the physical information table describing physical information of the branch switch and the junction switch, and the optical signal level of the optical signal level monitor request Determine whether the optical signal level can be measured at the monitor point,
When the optical signal level measurement is possible, the optical signal level monitor request is transmitted to the driver of the optical level monitor at the optical signal level monitor point to drive the optical level monitor, and the light at the optical signal level monitor point is Get signal level measurements,
The optical signal level monitor measurement value acquired with reference to the logical information table and the physical information table is subjected to physical configuration conversion and notified to the logical control function unit.

An optical subsystem control method according to the present invention includes:
A branch switch having one input port and a plurality of output ports;
A merge switch having one output port and a plurality of input ports;
A logical control function,
A physical control function unit;
The optical level disposed at each of the input port of the branch switch, the output port of part or all of the branch switch, the output port of the junction switch, and the input port of part or all of the junction switch A monitor,
An optical subsystem control method for an optical subsystem comprising:
When there is an optical signal level monitor request in the logical control function unit, the logical control function unit displays a connection state transition diagram relating to the connection of the branch switch and the junction switch and the optical signal level of the optical signal level monitor request. Determine whether or not the optical signal level monitor request is possible with reference to the optical level state transition diagram of the monitor point,
When the optical signal level monitor is possible, the logical control function unit transmits the optical signal level monitor request to the physical control function unit,
The physical control function unit that has received the optical signal level monitor request described a combination that can be connected between the input port and the output port of the branch switch and the output port and the input port of the junction switch. An optical signal level monitor for the optical signal level monitor request is obtained by performing physical configuration conversion on the optical signal level monitor request with reference to a logical information table and a physical information table describing physical information of the branch switch and the junction switch. Determine whether or not to measure the optical signal level at a point,
If the optical signal level measurement is possible, the physical control function unit sends the optical signal level monitor request to the driver of the optical level monitor at the optical signal level monitor point to drive the optical level monitor, Obtaining an optical signal level measurement value of the optical signal level monitoring point;
The physical control function unit performs physical configuration conversion on an optical signal level monitor measurement value acquired by referring to the logical information table and the physical information table, and notifies the logical control function unit of the physical configuration conversion.

  Since the present optical subsystem further includes an optical level monitor at a predetermined location, the setting of the logical information table and the physical information table can be changed to cope with various optical intensity monitoring settings for optical signals.

An optical subsystem according to the present invention includes:
A branch switch having one input port and a plurality of output ports;
One output port, a plurality of input ports, a merging switch having a light intensity adjustment function for adjusting the light intensity of an optical signal output from the output port, a logical control function unit,
A physical control function unit;
An optical level monitor disposed at the output port of the junction switch;
An optical subsystem comprising:
The logical control function unit includes:
When there is an ALC (Auto Level Control) request, a connection state transition diagram regarding the connection of the branch switch and the junction switch, an optical level state transition diagram of an optical signal level monitor point where the optical level monitor is arranged, and Determine whether ALC is possible with reference to the ALC transition state diagram of the output port of the ALC request,
If ALC is possible, notify the physical control function unit of the merging switch of the ALC request,
The physical control function unit
When the ALC request is notified from the logical control function unit, the ALC request is subjected to physical configuration conversion with reference to the logical information table and the physical information table, and the ALC request is then transmitted to the optical signal level monitor. An optical signal level measurement request at a point is transmitted to the driver of the optical level monitor to drive the optical level monitor to obtain an optical signal level measurement value at the optical signal level monitor point, and a preset ALC Determining an attenuation setting of an optical signal based on a target value and the optical signal level measurement value, and sending the attenuation setting to a driver of the optical intensity adjustment function to perform feedback for driving the optical intensity adjustment function;
It is characterized by that.

An optical subsystem control method according to the present invention includes:
A branch switch having one input port and a plurality of output ports;
A merge switch having a light intensity adjustment function for adjusting the light intensity of an optical signal output from one output port and a plurality of input ports and the output port;
A logical control function,
A physical control function unit;
An optical level monitor disposed at the output port of the junction switch;
An optical subsystem control method for an optical subsystem comprising:
When there is an ALC (Auto Level Control) request, the logical control function unit displays a connection state transition diagram relating to the connection of the branch switch and the junction switch, and an optical signal level monitor point where the optical level monitor is arranged. Determine whether ALC is possible with reference to an optical level state transition diagram and an ALC transition state diagram of the output route of the ALC request,
When ALC is possible, the logical control function unit notifies the physical control function unit of the merging switch of the ALC request,
The physical control function unit that has been notified of the ALC request performs physical configuration conversion on the ALC request with reference to the logical information table and the physical information table, and then sends the ALC request to the optical signal level monitoring point. The optical signal level measurement request is transmitted to the driver of the optical level monitor to drive the optical level monitor to acquire the optical signal level measurement value at the optical signal level monitor point, and the preset ALC target value And determining the attenuation setting of the optical signal based on the measured value of the optical signal level, sending the attenuation setting to the driver of the optical intensity adjustment function, and performing feedback to drive the optical intensity adjustment function,
It is characterized by that.

  Since this optical subsystem can adjust the light intensity of the optical signal output from the output path by measuring it with an optical level monitor, the light intensity of various optical signals can be changed by changing the settings of the logical information table and physical information table. It can correspond to control.

  The optical subsystem according to the present invention further includes a setting change function unit that changes a combination of optical paths that can be set by changing settings of the logical information table and the physical information table of the physical control function unit. It is characterized by.

  The optical subsystem control method according to the present invention is characterized in that a combination of optical paths that can be set is changed by changing settings of the logical information table and the physical information table.

  This optical subsystem can respond to various optical path settings, monitoring settings, light intensity control, and operation mode changes by inputting commands from the host device.

  The present invention can provide an optical subsystem and an optical subsystem control method that do not require individual design and manufacture even when the combination of optical components to be used is changed, and have a short development period and low cost.

It is a figure which shows the structural example of a photonic network. It is a figure which shows the structural example of the conventional M-degree ROADM node. It is a figure which shows the relationship between an M-degree ROADM node and an optical subsystem. It is a figure which shows the structural example of the optical subsystem which concerns on this invention. It is a figure which shows the example of the optical component which comprises the branch switch of the optical subsystem which concerns on this invention, and its connection method. It is a figure which shows the example of the optical component which comprises the confluence | merging switch of the optical subsystem which concerns on this invention, and its connection method. It is a control flow explaining the optical subsystem control method which concerns on this invention. It is a figure which shows the connection state transition of the branch switch of the optical subsystem which concerns on this invention, and a confluence | merging switch. It is a figure which shows the logical physical conversion table of the optical subsystem which concerns on this invention. It is a figure which shows the structural example of the optical subsystem which concerns on this invention. It is a figure which shows the example of the optical component which comprises the optical signal level monitor in the branch switch of the optical subsystem which concerns on this invention, and its connection method. It is a figure which shows the example of the optical component which comprises the optical signal level monitor in the confluence | merging switch of the optical subsystem which concerns on this invention, and its connection method. It is a control flow explaining the optical subsystem control method which concerns on this invention. It is a figure which shows the optical level state transition of the optical signal level monitor in the optical path relevant to the branch switch and confluence | merging switch of the optical subsystem which concerns on this invention. It is a figure which shows the logical physical conversion table of the optical subsystem which concerns on this invention. It is a figure which shows the structural example of the optical subsystem which concerns on this invention. It is a figure which shows the example of the optical component required in order to manufacture the confluence | merging switch and optical level monitor of the optical subsystem which concerns on this invention, and its connection method. It is a control flow explaining the optical subsystem control method which concerns on this invention. It is a figure which shows the ALC state transition of the ALC function in the confluence | merging switch of the optical subsystem which concerns on this invention. It is a figure which shows the logical physical conversion table of the optical subsystem which concerns on this invention. It is a control flow explaining the optical subsystem control method which concerns on this invention. It is a figure which shows the information exchange path | route between each control function part of the optical subsystem which concerns on this invention. It is a figure which shows the example of the optical component which comprises the optical signal level monitor in the confluence | merging switch of the optical subsystem which concerns on this invention, and its connection method. It is a figure which shows the logical physical conversion table of the optical subsystem which concerns on this invention. It is a figure which shows the logical information table of the optical subsystem which concerns on this invention. It is a figure which shows the physical information table of the optical subsystem which concerns on this invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components. Moreover, when it demonstrates without attaching a branch number, it is description common to all the branch numbers of the said code | symbol.

(Embodiment 1)
[Setting processing: Optical path setting]
As setting system processing in the optical subsystem constituting the ROADM node, an optical path setting method in the optical node will be described as an example, and an application method and effects of the optical subsystem will be described.

  FIG. 3 is a diagram illustrating a relationship between an optical node 401 that is an M-degree ROADM node (M is an integer of 2 or more) and an optical subsystem 11 that constitutes the optical node 401. The optical node 401 includes a node management control unit 10 that manages the entire optical node and M optical subsystems 11, and the node management control unit 10 controls each optical subsystem 11. Note that the node management control unit 10 is not necessarily provided inside the optical node 401, and may be provided outside the optical node 401 and connected to the optical node 401 via a data communication network.

  FIG. 4 is a diagram illustrating a configuration example of the optical subsystem 11 having an optical path setting function. The optical subsystem 11 includes a branching switch 21 connected to the path m (1 ≦ m ≦ M) as an optical path on the input side, and a junction switch 22 connected to the path m as an optical path on the output side.

  The branch switch 21 includes a branch side route selection switch 31 and a branch side wavelength assignment switch 32. In the branch side route selection switch 31, whether the input optical path of the route m is connected to the receiver 41 in the route m or to the other route m ′ (m ≠ m ′), node management control An output port of the switch is selected according to a command from the unit 10, and an optical path is set by connecting the input port of the switch and the corresponding output port. Here, a case where the optical path is connected to the receiver 41 in the route m is defined as a Drop state. In the case of Drop, in the branch side wavelength allocation switch 32, the output port of the switch is selected according to the instruction from the node management controller 10 to which receiver 41 the optical path is connected, and the switch input port and the corresponding output port The optical path is set by connecting.

  The merge switch 22 includes a merge side route selection switch 33 and a merge side wavelength assignment switch 34. In the merge side route selection switch 33, whether the output optical path of the route m is connected to the transmitter 42 in the route m or to the other route m ′ (m ≠ m ′), node management control An input port of the switch is selected according to a command from the unit 10, and an optical path is set by connecting the output port of the switch and the corresponding input port. Here, a case where the optical path is connected to the transmitter 42 in the route m is defined as an Add state. In the case of Add, in the merging-side wavelength assignment switch 34, the input port of the switch is selected according to the instruction from the node management control unit 10 to which transmitter 42 the optical path is connected, and the output port of the switch and the corresponding input port The optical path is set by connecting.

  As described above, the optical subsystem 11 has four switch functions (branch side route selection switch 31, branch side wavelength assignment switch 32, merge side route selection switch 33, and merge side wavelength assignment switch 34). However, these switches represent switch functions in the optical subsystem 11, and the arrangement of optical switches, which are optical components necessary for manufacturing the optical subsystem 11, and the physical input / output ports of the optical switch 11 are described. It does not indicate a connection relationship.

  FIG. 5 illustrates an optical component necessary for manufacturing the branch switch 21 included in the optical subsystem 11 having a colorless function and a connection method thereof. In the example shown in FIG. 5, N receivers 41 (N is a natural number) and the branch switch 21 are connected. In the example shown in FIG. 5 a, 1 × M WSS is adopted as the branch side route selection switch 31, and 1 × N WSS is adopted as the branch side wavelength assignment switch 32. In the example shown in FIG. 5b, the branch side path selection switch 31 and the branch side wavelength assignment switch 32 are configured by one 1 × (M + N) WSS. One WSS is different from the example shown in FIG. 5a in that it has both an output port connected to the other path and an output port connected to the receiver 41 of its own node. In the example shown in FIG. 5 c, a 1 × M optical coupler (OC) is adopted as the branch side path selection switch 31, and 1 × N WSS is adopted as the branch side wavelength assignment switch 32. Here, the optical coupler 31 is an optical component having a function of simultaneously distributing an input optical path signal to all output ports. As shown in FIG. 5, in the branch switch 21, three combinations of optical components are conceivable.

  FIG. 6 illustrates the optical components necessary for manufacturing the junction switch 22 constituting the optical subsystem 11 having the colorless function and the connection method thereof. In the example illustrated in FIG. 6, N transmitters (N is a natural number) and the junction switch 22 are connected. In the example shown in FIG. 6 a, M × 1 WSS is adopted as the merging side path selection switch 33, and N × 1 WSS is adopted as the merging side wavelength assignment switch 34. In the example shown in FIG. 6b, the merging-side route selection switch 33 and the merging-side wavelength assignment switch 34 are configured by one (M + N) × 1 WSS. One WSS is different from the example shown in FIG. 6a in that it has both an input port connected to the other path and an input port connected to the transmitter of the own node. In the example shown in FIG. 6 c, an M × 1 optical coupler is adopted as the merge side path selection switch 33, and N × 1 WSS is adopted as the merge side wavelength assignment switch 34. As shown in FIG. 6, in the junction switch 22, three combinations of optical components are conceivable.

  As shown in FIGS. 5 and 6, since there are three combinations of the optical components of the branch switch 21 and the junction switch 22, there are nine combinations of the optical components constituting the optical subsystem 11 in total. However, if the optical component configurations of FIG. 5c and FIG. 6c are combined, an optical path is also set in a route not intended by the operator, and thus cannot be adopted as a configuration. Therefore, when there is a possibility of adopting the optical components shown in FIGS. 5 and 6, conventionally, an optical subsystem manufacturer had to design and manufacture eight types of optical subsystems and their control methods.

FIG. 7 is a control flow of the optical subsystem 11. Hereinafter, the path setting method of the optical path signal related to the route m will be described in detail along the control flow illustrated in FIG.
(1) An optical path setting request from the node management control unit 10 is received by an IF (Interface) function unit.
(2) The IF function unit requests the logical control function unit to set an optical path.
(3) The logic control function unit analyzes the optical path setting request received from the IF function unit, refers to the connection state transition of the corresponding branch switch 21 and the junction switch 22, and determines whether or not the optical path setting is possible. The connection state transition of the branch switch 21 and the junction switch 22 will be described later. When the optical path setting is impossible, the logical control function unit notifies the IF function unit of request rejection.
(4) If an optical path can be set, an optical path setting request is transmitted to the physical control function units of the branch switch 21 and the junction switch 22.
(5) The physical control function unit of the branch switch 21 and the junction switch 22 refers to the combination of the logical information table and the physical information table, converts the physical configuration to the path setting request, and sets the switch of the optical switch that is an optical component. Judgment is made. In the following description, “a set of a logical information table and a physical information table” may be referred to as a “logical physical conversion table”. A process of performing physical configuration conversion on an optical path setting request with reference to the logical-physical conversion table will be described later. When the switch setting is impossible, the request rejection is notified to the IF function unit via the logic control function unit.
(6) If switch setting is possible, a switch setting request is transmitted to the driver of the corresponding optical switch.
(7) The optical switch driver drives the optical switch based on the switch setting request.
(8) When the optical switch is driven as requested, ACK (Acknowledgement) is notified to the logic control function unit.
(9) The logical control function unit updates the connection state in the connection state transition diagram of the branch switch 21 and the junction switch 22 based on the ACK notification.
(10) ACK notification is sent from the logic control function unit to the IF function unit.
(11) The ACK notification is sent from the IF function unit to the node control management unit.

  Next, connection state transitions necessary for managing the states of the branch switch 21 and the junction switch 22 in the logic control function unit will be described. FIG. 8 is a connection state transition diagram of the branch switch 21 and the junction switch 22 in the optical subsystem 11. FIG. 8a shows a connection state transition when an optical path signal having a certain wavelength λn is connected to the other path m ′. When considering setting the optical path to the other path m ′, the state that the branch switch 21 can take is {OFF, XC} (XC: cross connect), and the state that the junction switch 22 can take is {OFF, XC }. The connection state transition diagram shows the states that the branch switch 21 and the junction switch 22 can take, which means that the switch state can be changed between the states connected by the arrows in the figure. FIG. 8b shows connection state transition when an optical path signal of a certain wavelength λn is connected to the transceiver n of the own node. When considering setting the optical path to the transceiver n of the own node, the state that the branch switch 21 can take is {OFF, drop}, and the state that the junction switch 22 can take is {OFF, add}. The connection state transition diagram shows the states that the branch switch 21 and the junction switch 22 can take, which means that the switch state can be changed between the states connected by the arrows in the figure. The logical control function unit in the optical subsystem 11 determines whether the optical path setting request received from the IF function unit is acceptable based on the connection state transition diagram.

Next, a process of performing physical configuration conversion on an optical path setting request with reference to the logical / physical conversion table will be described. FIG. 9 shows a logical-physical conversion table in the optical path setting of the optical subsystem 11. FIG. 9A is a logical information table in which the output paths that can be connected in the XC state and the transmission / reception port numbers of the transceivers that can be connected in the Add-Drop state are described in the table. FIG. 9B is a physical information table of the branch switch 21 composed of the optical components shown in FIG. 5A. For example, from the logic control function unit
“Connect optical path signal of wavelength λn to output path M”
When the optical path setting request is received, the M line of the logical information table and the M line of the physical information table are collated,
“Connect WSS # 1 input port 1 and output port M”
Is converted into a switch setting request and transmitted to the driver of the corresponding optical component. For example, from the logic control function unit,
“Connect optical path signal of wavelength λn to receiving port n”
When the optical path setting request is received, the (M + n) line of the logical information table and the (M + n) line of the physical information table are collated.
“Connect WSS # 1 input port 1 and output port m”
And “Connect input port 1 and output port n of WSS # 2”
Is converted to a switch setting request and sent to the driver of each corresponding optical component.

FIG. 9c is a physical information table of the branch switch 21 composed of the optical components shown in FIG. 5b. FIG. 9d is a physical information table of the branch switch 21 composed of the optical components shown in FIG. 5c. FIG. 9d is different from FIG. 9b in that the optical coupler constituting the branch side path selection switch 31 is a passive component and does not need to be driven by a driver. For example, from the logic control function unit
“Connect optical path signal of wavelength λn to output path M”
When the optical path setting request is received, the M-th row of the logical information table and the M-th row of the physical information table are collated, and it is found that the corresponding optical component is an optical coupler. Since the optical coupler is always connected to the route M and does not need to be controlled, the optical path setting request is masked without being converted into a request to the driver. For example, from the logic control function unit
“Connect optical path signal of wavelength λn to receiving port n”
When the optical path setting request is received, the (M + n) line of the logical information table and the (M + n) line of the physical information table are collated.
“Connect WSS # 1 input port 1 and output port M”
Is converted to a switch setting request and sent to the driver of the corresponding optical component. FIGS. 9e, f, and g are physical information tables of merging switches configured by the optical components shown in FIGS. 6a, 6b, and 6c.

  The effects when the optical subsystem 11 of this control method is manufactured are summarized as follows. As an example, consider a case where the optical subsystem manufacturer employs the optical component configuration of FIG. 5 a as the branch switch 21 and the optical component configuration of FIG. 6 a as the junction switch 22 to manufacture the optical subsystem 11. For example, when it is necessary to separately adopt the optical component configuration of FIG. 5b as the branch switch 21 and the optical component configuration of FIG. 6b as the junction switch 22, if the optical subsystem 11 of this control method is used, It is possible to replace the optical component and the driver that drives the optical component only by changing the logical-physical conversion table of the control function unit. The change of the logical-physical conversion table can be rewritten by, for example, a command from a higher-level device that controls the optical subsystem 11. When the optical subsystem 11 corresponding to the optical component configuration shown in FIGS. 5 and 6 is manufactured, the cost and time required for manufacturing the optical subsystem can be reduced to 1/8 by using this control method. Is possible. Of course, as the number of optical parts is diversified, the number of combinations of optical parts increases, so that the effects of the present invention are more remarkably exhibited.

(Embodiment 2)
[Monitoring processing: Optical signal level monitor]
As a monitoring system process in the optical subsystem constituting the ROADM node, an optical signal level monitoring method in the optical node will be described as an example, and an application method and effects of the optical subsystem will be described. The relationship between the optical subsystem of this example and the ROADM node is the same as that described in the first embodiment shown in FIG.

  FIG. 10 is a diagram showing a configuration example of an optical subsystem 11 'having an optical signal level monitoring function. The optical subsystem 11 ′ includes an optical level monitor (M1 to M8) in addition to the branch side path selection switch 31, the branch side wavelength assignment switch 32, the merge side path selection switch 33, and the merge side wavelength assignment switch 34 of FIG. Is provided. The optical level monitor M1 monitors the optical intensity of the optical path signal input to the branch side path selection switch 21, and the optical level monitor M2 monitors the optical intensity of the optical path signal output from the branch side path selection switch. The optical level monitor M3 monitors the optical intensity of the optical path signal input to the branch side wavelength allocation switch 32, and the optical level monitor M4 monitors the optical intensity of the optical path signal output from the branch side wavelength allocation switch 32. The optical level monitor M5 monitors the light intensity of the optical path signal input to the merging side path selection switch 33, and the optical level monitor M6 determines the light intensity of the optical path signal output from the merging side path selection switch 33. The optical level monitor M7 monitors the optical intensity of the optical path signal input to the merging side wavelength assignment switch 34, and the optical level monitor M8 Monitoring the light intensity of the optical path signal output from the merging side wavelength assignment switch 34 are. However, these optical level monitors (M1 to M8) do not indicate a physical connection position of an OCM (Optical Channel Monitor) which is an optical component necessary for manufacturing the optical subsystem 11 '.

  FIG. 11 illustrates an optical component included in the branch switch 21 included in the optical subsystem 11 ′ and a connection method thereof. Here, the OCM is capable of measuring the optical signal levels of a plurality of paths, and assumes a form in which the measurement target is switched by a selector and the optical signal levels in the respective paths are detected. 11A, 11B, and 11C are examples in which OCMs are respectively arranged with respect to the combination examples of the optical components constituting the branch switch 21 shown in FIGS. 5A, 5B, and 5C.

  FIG. 12 illustrates an optical component included in the junction switch 22 included in the optical subsystem 11 ′ and a connection method thereof. 12A, 12B, and 12C are examples in which OCMs are arranged with respect to the combinations of optical components that constitute the branch switch 22 shown in FIGS. 6A, 6B, and 6C.

FIG. 13 is a control flow of the optical subsystem 11 ′. Hereinafter, the optical signal level monitoring method of the optical path signal related to the route m will be described in detail along the control flow illustrated in FIG.
(1) The IF function unit receives an optical signal level monitor request from the node management control unit 10.
(2) The IF function unit requests the logic control function unit to monitor the optical signal level.
(3) The logic control function unit analyzes the optical signal level monitor request received from the IF function unit, and implements the optical level state management transition of the corresponding monitor point and the set state of the optical signal path including the corresponding monitor point. With reference to the connection state transition described in the first embodiment, it is determined whether or not the optical signal level monitor is possible. The management of the light level state transition at the monitor point will be described later. If the optical signal level cannot be monitored, a request rejection is notified to the IF function unit.
(4) When the optical signal level monitor is possible, the optical signal level monitor is requested to the physical control function unit of the branch switch 21 and the junction switch 22.
(5) The physical control function unit of the branch switch 21 and the junction switch 22 refers to the logical-physical conversion table and performs physical configuration conversion on the optical signal level monitor request. The process of performing physical configuration conversion on the optical signal level monitor request with reference to the logical-physical conversion table will be described later. When the optical signal level monitoring is impossible, the request rejection is notified to the IF function unit via the logic control function unit.
(6) Request an optical signal level measurement value of the corresponding monitor point.
(7) In the OCM driver at the relevant monitor point, the optical signal level measurement value at the relevant monitor point is read and recorded.
(8) Notify the recorded optical signal level measurement values to the physical control function units of the branch switch 21 and the junction switch 22, respectively.
(9) The physical control function units of the branch switch 21 and the merge switch 22 perform physical configuration conversion on the optical signal level monitor measurement values acquired with reference to the logical-physical conversion table.
(10) Notifying the logical control unit of the optical signal level monitor value subjected to the physical configuration conversion.
(11) The logic control function unit updates the optical level state in each optical level state transition diagram for the optical signal level state of the optical path related to the branch switch 21 and the junction switch 22 based on the optical signal level monitor value. .
(12) The logic control function unit notifies the IF function unit of ACK or alert according to the updated light level state.
(13) The IF function unit notifies the node control management unit of ACK or alert.

  In the control flow of FIG. 13, the monitor request (2) from the IF function unit is directly sent from the IF function unit to the logic control function unit, but the configuration is not limited to this. For example, based on the optical path setting request shown in the first embodiment, the configuration control process logic control function unit sends an optical signal path optical signal level monitor request to the monitoring system process logic control function unit. Is also possible.

  Next, the optical level state transition required for managing the optical signal level monitor state in the optical path related to the branch switch 21 and the junction switch 22 in the logic control function unit will be described. FIG. 14 is an optical level state transition diagram in the optical path of the branch switch 21 and the junction switch 22 provided in the optical subsystem 11 '.

  FIG. 14 a shows an optical level state transition diagram of the optical signal level monitor when an optical path signal having a certain wavelength λn is connected to the other path m ′. When considering setting the optical path to the other path m ′, the possible state of the optical signal level monitoring result is {normal, abnormal, standby}. “Normal” corresponds to a case where the detected optical signal level is higher than a preset threshold value. Abnormality corresponds to the case where the detected optical signal level is lower than the preset threshold value, and there is a possibility of failure of optical components involved in the optical signal path, so an alert is sent to the IF function unit There is a case. Standby is a state where detection of the optical signal level is stopped. The detection stop described here does not necessarily mean that the OCM, which is an optical component, stops measuring the optical signal level. For example, the OCM always measures the optical signal level and writes the measurement result to the recording device irrespective of the request from the node management control unit, while writing the written optical signal level value from the physical control function unit. The state not notified to the logical control function unit also corresponds to the standby state. In the optical level state transition diagram, possible states of the optical signal level monitoring results in the optical paths related to the branch switch 21 and the junction switch 22 are shown, respectively, and the monitor state between the states connected by the arrows in the figure is shown. It means that transition is possible.

  FIG. 14B shows an optical level state transition diagram of the optical signal level monitor when an optical path signal of a certain wavelength λn is connected to the transceiver n of the own node. When considering setting the optical path to the transceiver n of the own node, the possible state of the optical signal level monitoring result is {normal, abnormal, standby}. This means that the monitor state can be changed between the states connected by the arrows in the figure. The logical control function unit in the optical subsystem 11 ′ determines whether or not an optical signal level monitor request received from the IF function unit is available based on the optical level state transition diagram. In addition, the optical level state transition is updated based on the relationship between the optical signal level monitor value subjected to physical configuration conversion with reference to the logical physical conversion table in the physical control function unit and a preset threshold value.

  Next, a process of performing physical configuration conversion on the optical signal level monitor request with reference to the logical physical conversion table and a process of performing physical configuration conversion on the optical signal level monitor value acquired with reference to the logical physical conversion table will be described. To do. FIG. 15 shows a logical-physical conversion table in the optical signal level monitor of the optical subsystem 11 '. FIG. 15A is a logical information table in which output routes that can be connected in the XC state and transmission / reception port numbers of the transceivers that can be connected in the add-drop state are described in the table. FIG. 15B is a physical information table of an optical level monitor composed of the optical components shown in FIG. 11A.

For example, from the logic control unit,
“Monitor the optical signal level of the optical path signal of wavelength λn connected to the output route M”
When the monitor request is received, the M line of the logical information table is compared with the M line of the physical information table,
“Read the value of OCM # 1 as the monitor point M1, and read the value of the selector M of OCM # 2 as the monitor point M2.”
The corresponding optical signal level measurement result is acquired by converting into the monitor request.

For example, from the logic control function unit,
“Monitor the optical signal level of the optical path signal of wavelength λn connected to the receiving port n”
When the monitor request is received, the (M + n) line of the logical information table and the (M + n) line of the physical information table are collated,
“Read the value of OCM # 1 as monitor point M1, read the value of selector m of OCM # 2 as monitor point M2, read the value of selector m of OCM # 2 as monitor point M3, monitor point Read the value of selector n of OCM # 3 as M4 "
The corresponding optical signal level measurement result is acquired by converting into the monitor request.

  FIG. 15C is a physical information table of an optical level monitor constituted by the optical components shown in FIG. 11B. FIG. 15d is a physical information table of an optical level monitor composed of the optical components shown in FIG. 11c. FIG. 11c is different from FIG. 11b in that the optical coupler constituting the branch side route selection switch 31 is a passive component and no OCM is connected to the output port.

For example, from the logic control unit,
“Monitor the optical signal level of the optical path signal of wavelength λn connected to the output route M”
When the monitor request is received, the M line of the logical information table is compared with the M line of the physical information table,
“Read the value of OCM # 1 as the monitor point M1, read the value of OCM # 1 as the monitor point M2, and subtract 3.1 dBm”
The corresponding optical signal level measurement result is acquired by converting into the monitor request. Here, since no OCM is connected to the monitor point 2, the value of the monitor point 1 is lost in principle due to the branching of the optical coupler output (for example, about 3 dB when M = 2), and the excess of the optical coupler. Considering the sum of losses (for example, 0.1 dB), the difference between FIG. 16 b and the monitor point M 2 is that the value obtained by subtracting 3.1 dBm from the optical signal level at the input port of the optical coupler is used.

For example, from the logic control function unit
“Monitor the optical signal level of the optical path signal of wavelength λn connected to the receiving port n”
When the monitor request is received, the (M + n) line of the logical information table and the (M + n) line of the physical information table are collated,
“Read the value of OCM # 1 as the monitor point M1, read the value of OCM # 1 as the monitor point M2, subtract 3.1 dBm, read the value of OCM # 1 as the monitor point M3, subtract 3.1 dBm, as the monitor point M4 Read the value of selector n in OCM # 2 "
The corresponding optical signal level measurement result is acquired by converting into the monitor request. FIGS. 16e, f, and g are physical information tables of an optical level monitor constituted by the optical components shown in FIGS. 12a, b, and c.

  The effects when the optical subsystem 11 ′ of this control method is manufactured are summarized as follows. As an example, the optical subsystem manufacturer adopts the optical component configuration of FIG. 11 a as the optical level monitor related to the branch switch 21, and adopts the optical component configuration of FIG. 12 a as the optical level monitor related to the junction switch 22. Consider the case of manufacturing 11 ′. For example, when it is necessary to adopt the optical component configuration of FIG. 11b as an optical level monitor related to the branch switch 21 and to adopt the optical component configuration of FIG. With the optical subsystem 11 ′ of the method, it is possible to replace the optical component and the driver that drives the optical component only by changing the logical-physical conversion table of the physical control function unit. The change of the logical / physical conversion table can be rewritten by, for example, a command from a host device that controls the optical subsystem 11 '. When the optical subsystem 11 ′ corresponding to the optical component configuration shown in FIGS. 11 and 12 is manufactured, the cost and time required for manufacturing the optical subsystem are reduced to 1/8 by using this control method. It is possible. Of course, as the number of optical parts is diversified, the number of combinations of optical parts increases, so that the effects of the present invention are more remarkably exhibited.

(Embodiment 3)
[Control system processing: ALC in merge side route selection switch]
As an example of a control system process in the optical subsystem constituting the ROADM node, an ALC (Auto Level Control) function in the merge side path selection switch in the optical node will be described as an example, and the application method and effect of the optical subsystem will be described. The relationship between this optical subsystem and the ROADM node is the same as described in the first embodiment shown in FIG.

  FIG. 16 is a diagram showing a configuration example of an optical subsystem 11 ″ in which the merge side route selection switch 33 connected to the output route m has an ALC function. The optical subsystem 11 ″ is the branch side of FIG. In addition to the path selection switch 31, the branch side wavelength assignment switch 32, the merging side path selection switch 33, and the merging side wavelength assignment switch 34, the light for monitoring the light intensity of the optical path signal output from the merging side path selection switch 34 A level monitor M6 is provided. The ALC function provided in the merging-side route selection switch 33 is intended to adjust the intensity of the optical signal output from the optical subsystem 11 ″ to the route m to a preset intensity value. Refers to the optical signal level detected by the optical level monitor M6 and the target intensity value set in advance, and the FB is selected in the junction side path selection switch 33 having a variable optical attenuator (VOA) function. (Feedback) control is performed.

  FIG. 17 illustrates the optical components necessary for the converging switch 22 and the optical level monitor M6 of the optical subsystem 11 ″ and the connection method thereof. Here, the OCM individually measures the optical signal levels of a plurality of wavelengths. 17a, b, and c are examples in which an OCM and a VOA are respectively arranged with respect to the combination example of the optical components constituting the junction switch 22 shown in FIGS. .

FIG. 18 shows a control flow of the optical subsystem 11 ″. Hereinafter, an ALC implementation method of the optical path signal related to the route m will be described in detail along the control flow illustrated in FIG.
(1) The IF function unit receives an ALC request from the node management control unit 10.
(2) Request an ALC from the IF function unit to the logic control function unit.
(3) The logic control function unit analyzes the ALC request received from the IF function unit, and performs the connection state transition described in the first embodiment for the ALC state transition of the corresponding ALC function and the setting state of the corresponding optical signal path. Further, referring to the optical level state management transition described in the second embodiment for the monitoring state of the corresponding optical signal level monitoring point, it is determined whether or not ALC is possible. The management of the ALC state transition of the ALC function will be described later. If ALC is not possible, the IF function unit is notified of request rejection.
(4) If ALC is possible, request ALC from the physical control function unit of the merge switch.
(5) The physical control function unit of the merge switch 22 refers to the logical-physical conversion table and performs physical configuration conversion on the ALC request.
(6) ALC is requested to the FB control unit of the physical control function unit.
(7) The optical signal level measurement value of the corresponding optical signal level monitoring point is requested from the FB control unit.
(8) The OCM driver at the corresponding monitor point drives the optical level monitor M6, and reads and records the optical signal level measurement value at the corresponding monitor point.
(9) The recorded optical signal level measurement value is notified to the FB control unit.
(10) The FB control unit determines the attenuation setting required for the VOA function based on the preset ALC target value and optical signal level monitor value.
(11) Notify the attenuation setting value to the VOA function.
(12) The driver of the VOA function drives the VOA based on the attenuation setting value.
(13) ACK or alert is notified from the FB control unit to the logic control function unit according to the FB control state.
(14) The logic control function unit updates the state transition in the ALC state transition diagram of the ALC function in response to ACK or alert.
(15) The ACK or alert is notified from the logic control function unit to the IF function unit in accordance with the updated ALC state transition.
(16) The IF function unit notifies the node control management unit of ACK or alert.

  In the FB control, an allowable amount is set for the difference between the preset target value and the optical signal level measurement value, and (9) to (11) until the difference between the target value and the optical signal level measurement value falls within the set allowable amount. ) Repeat the flow.

  In the control flow of FIG. 18, the ALC request (2) from the IF function unit is directly sent from the IF function unit to the logic control function unit, but the present invention is not limited to this embodiment. For example, based on the optical path setting request shown in the first embodiment, an ALC request for an optical signal path may be sent from the logical control function unit for setting system processing to this logical control function unit.

  FIG. 21 is a diagram showing another example of this control flow. It differs from the control flow shown in FIG. 18 in that the FB control unit is arranged in the logic control function unit. In the control flow shown in FIG. 21, the physical configuration conversion shown in (17) is performed in the step of notifying the FB control unit of the optical signal level value represented by the flow (9). That is, the FB control unit acquires the optical signal level of the optical level monitor M6 on the optical subsystem configuration without recognizing the optical component for measuring the optical signal level. Further, in the step of notifying the optical attenuation amount setting value from the FB control unit represented by the flow (11), the physical configuration conversion shown in (17) is performed. That is, the FB control unit notifies the VOA function on the optical subsystem configuration of the optical attenuation setting value without recognizing the optical component that expresses the VOA function. Even when the control flow shown in FIG. 21 is adopted, an effect equivalent to the effect described in FIG. 18 can be obtained.

  Next, the ALC state transition necessary for managing the ALC state in the optical path related to the merging switch 22 in the logic control function unit will be described. FIG. 19 is an ALC state transition diagram in the optical subsystem 11 ″.

  FIG. 19 a shows an ALC state transition diagram when an optical path signal having a certain wavelength λn is connected to the other path m ′. When considering setting the optical path to the other path m ′, the state that the ALC can take is {ALC mode, shutdown, OFF}. The ALC mode corresponds to the states of the control flows (9) to (11) shown in FIG. The shutdown is a state in which the VOA is driven based on a preset fixed attenuation amount regardless of the optical signal level monitor value acquired in the control flow (9) shown in FIG. OFF is a state in which the VOA is not driven. The ALC state transition diagram shows the states that ALC can take, which means that ALC state transition is possible between the states connected by the arrows in the figure.

  FIG. 19b shows an ALC state transition diagram when an optical path signal of a certain wavelength λn is connected to the transceiver n of the own node. When considering setting the optical path to the transceiver n of the own node, the state that the ALC can take is {ALC mode, shutdown, OFF}. This means that ALC state transition is possible between states connected by arrows in the figure. The logical control function unit in the optical subsystem according to the third embodiment determines whether the ALC request received from the IF function unit is acceptable based on the ALC state transition diagram. Also, the ALC state transition is updated based on the notification from the FB control unit.

  Next, a process of performing physical configuration conversion on the ALC request with reference to the logical-physical conversion table will be described. FIG. 20 shows a logical-physical conversion table in the ALC function of the optical subsystem 11 ″. FIG. 20a is a logical information table, which is an output path that can be connected in the XC state and can be connected in the Add-Drop state. 20b is a physical information table of VOA and optical signal level monitor points composed of the optical components shown in Fig. 17a, where the VOA function is WSS. For example, in WSS using MEMS (Micro Electro Mechanical Systems) technology, the angle of a mirror that reflects incident light is controlled to control input / output. It is known that the path connection function and the VOA function are expressed simultaneously.

For example, from the logic control unit,
“ALC is performed on the optical path signal of wavelength λn connected to the output path M”
When the ALC request is received, the M line of the logical information table is matched with the M line of the physical information table,
“Drive WSS # 1 input port #M as VOA function and read OCM # 1 value as monitor point”
The request is converted into an ALC request and requested to the corresponding FB control unit. For example, from the logic control function unit,
“Perform ALC on optical path signal of wavelength λn connected to receiving port n”
If an ALC request is received,
“Drives WSS # 1 input port #m as VOA function and reads OCM # 1 value as monitor point”
The request is converted into an ALC request and requested to the corresponding FB control unit.

  FIG. 20c is a physical information table of VOAs and optical signal level monitor points configured by the optical components shown in FIG. 17b. FIG. 20d is a physical information table of VOAs and optical signal level monitor points constituted by the optical components shown in FIG. 17c. In FIG. 17d, the merge side path selection switch is composed of an optical coupler which is a passive component, and unlike the WSS having the VOA function and the switch function at the same time, a VOA is separately connected to the input port of the optical coupler. This is different from FIG. 17a. Here, it is assumed that the VOA includes one input port and one output port.

For example, from the logic control unit,
“ALC is performed on the optical path signal of wavelength λn connected to the output path M”
When the ALC request is received, the M line of the logical information table is matched with the M line of the physical information table,
“VOA # M is driven as a VOA function and the value of OCM # 1 is read as a monitor point”
The request is converted into an ALC request and requested to the corresponding FB control unit. For example, from the logic control function unit,
“Perform ALC on optical path signal of wavelength λn connected to receiving port n”
If an ALC request is received,
“VOA # m is driven as a VOA function, and the value of OCM # 1 is read as a monitor point”
The request is converted into an ALC request and requested to the corresponding FB control unit.

  The effects when the optical subsystem 11 ″ of the present control method is manufactured can be summarized as follows. As an example, the optical subsystem manufacturer uses the optical component configuration of FIG. 17a as a VOA and optical signal level monitor point related to ALC. Suppose that the optical subsystem 11 ″ is manufactured by adopting the above. For example, if it becomes necessary to separately adopt the optical component configuration of FIG. 17B as the VOA and optical signal level monitoring points related to ALC, if the optical subsystem 11 ″ of this control method is used, the logical physics of the physical control function unit It is possible to replace the optical component and the driver that drives the optical component only by changing the conversion table. For example, the logical-physical conversion table can be changed by a command from a host device that controls the optical subsystem 11 ″. It can be rewritten. When manufacturing the optical subsystem 11 "corresponding to the optical component configuration shown in FIG. 17, the cost and time required for manufacturing the optical subsystem can be reduced to 1/3 by using this control method. Of course, as the number of optical component combinations increases with the diversification of optical components, the effects of the present invention are more remarkably exhibited.

  FIG. 22 shows information exchange paths between functional units when the control flow of setting system processing, monitoring system processing, and control system processing described in Embodiments 1, 2, and 3 is simultaneously performed in the same optical subsystem. FIG.

(Embodiment 4)
[Change operation mode]
A case where the operation mode of the optical subsystem constituting the ROADM node is changed will be described. Here, the change of the operation mode means that the number of connected paths or the number of transceivers connected in the Add / Drop state is changed. Specifically, consider the case where an optical subsystem constituting a 2-degree ROADM node is operated as an optical subsystem for an 8-degree ROADM node. In this embodiment, a method for changing a logical-physical conversion table, not a method for changing an optical component constituting an optical subsystem, in order to realize a change in operation mode will be described. That is, in the present embodiment, it will be described that the operation mode of the optical subsystem can be changed only by converting the logical physical conversion table in the physical control function unit without changing the optical component.

  FIG. 23 shows optical components constituting the optical subsystem of this embodiment. FIG. 23A corresponds to the branch switch 21, and 1 × 43 WSS is adopted as the branch side route selection switch 31 and 1 × 43 WSS is adopted as the branch side wavelength assignment switch 32. One WSS has both an output port connected to the other path and an output port connected to the receiver of the own node. FIG. 23B corresponds to the merging switch 22, and 43 × 1 WSS is employed as the merging side path selection switch 33 and 43 × 1 WSS is employed as the merging side wavelength assignment switch 34. One WSS has both an input port connected to the other path and an input port connected to the transmitter of the own node. In the present embodiment, 1 × 43 WSS is described as an example of the optical component constituting the branch switch 21 and the junction switch 22, but the effect is not limited to 1 × 43 WSS, but other effects such as 1 × 9 WSS are used. Similar effects are exhibited in optical components.

  As a method for realizing the operation mode change in which the number of routes is changed from 2 to 8, the step of performing physical configuration conversion on the optical path setting request described in the first embodiment (control step (5) shown in FIG. 7) will be described. . In addition, about control processes other than the control process (5) shown in FIG. 7, there is no change accompanying an operation form change. FIG. 24 shows a logical-physical conversion table in the process of performing physical configuration conversion to the optical path setting request.

  First, the branch switch 21 will be described. FIG. 24A is a logical information table in an operation mode in which the number of routes is two. FIG. 24C is a physical information table of the branch switch 21 composed of the optical components shown in FIG. By using a logical-physical conversion table composed of a combination of the logical information table shown in FIG. 24 (a) and the physical information table shown in FIG. 24 (c), the number of routes is 2 and the maximum number of transmission / reception ports is 42. It becomes possible to operate as a system. On the other hand, FIG. 24B is a logical information table in an operation mode in which the number of routes is eight. By using a logical-physical conversion table composed of a combination of the logical information table shown in FIG. 24 (b) and the physical information table shown in FIG. 24 (c), an optical sub having 8 routes and a maximum of 36 transmission / reception ports. It becomes possible to operate as a system. In other words, the operation mode of the present embodiment can be changed only by changing the logical information table, and the control process other than the logical physical conversion table can be changed in the process of changing the optical component and the physical configuration conversion to the optical path setting request. do not need.

  Next, the merge switch 22 will be described. FIG. 24D is a logical information table in an operation mode in which the number of routes is two. FIG. 24F is a physical information table of the junction switch 22 composed of the optical components shown in FIG. By using a logical-physical conversion table composed of a combination of the logical information table shown in FIG. 24D and the physical information table shown in FIG. It becomes possible to operate as a system. On the other hand, FIG. 24E is a logical information table in an operation mode in which the number of routes is eight. By using a logical-physical conversion table composed of a combination of the logical information table shown in FIG. 24 (e) and the physical information table shown in FIG. 24 (f), the number of routes is 8 and the maximum number of transmission / reception ports is 36. It becomes possible to operate as a system. In other words, the operation mode of the present embodiment can be changed only by changing the logical information table, and the control process other than the logical physical conversion table can be changed in the process of changing the optical component and the physical configuration conversion to the optical path setting request. do not need.

  Regarding the method of realizing the operation mode change in which the number of routes is changed from 2 to 8, the step of performing physical configuration conversion on the optical signal level monitor request described in the second embodiment (control step (5) shown in FIG. 13) will be described. To do. In addition, about control processes other than the control process (5) shown in FIG. 13, there is no change accompanying an operation form change. FIG. 25 shows a logical information table constituting a logical-physical conversion table in the process of performing physical configuration conversion on the optical signal monitor request. FIG. 26 shows a physical information table constituting a logical-physical conversion table in the process of performing physical configuration conversion on an optical signal monitor request.

  First, the branch switch 21 will be described. FIG. 25A is a logical information table in an operation mode in which the number of routes is two. FIG. 26A is a physical information table of the branch switch 21 composed of the optical components shown in FIG. By using a logical-physical conversion table composed of a combination of the logical information table shown in FIG. 25 (a) and the physical information table shown in FIG. 26 (a), the number of routes is 2 and the maximum number of transmission / reception ports is 42. It becomes possible to operate as a system. On the other hand, FIG. 25B is a logical information table in an operation mode in which the number of routes is eight. By using a logical-physical conversion table composed of a combination of the logical information table shown in FIG. 25 (b) and the physical information table shown in FIG. 26 (b), the number of routes is 8 and the maximum number of transmission / reception ports is 36. It becomes possible to operate as a system. That is, the operation mode of this embodiment can be changed only by changing the logical information table and the physical information table. Control other than the logical / physical conversion table in the process of changing the optical component and the physical configuration conversion to the optical path setting request No process changes are required.

  Next, the merge switch 22 will be described. FIG. 25C is a logical information table in an operation mode in which the number of routes is two. FIG. 26C is a physical information table of the merging switch 22 composed of the optical components shown in FIG. By using a logical-physical conversion table composed of a combination of the logical information table shown in FIG. 25 (c) and the physical information table shown in FIG. 26 (c), the number of routes is 2 and the maximum number of transmission / reception ports is 42. It becomes possible to operate as a system. On the other hand, FIG. 25D is a logical information table in an operation mode in which the number of routes is eight. By using a logical-physical conversion table composed of a combination of the logical information table shown in FIG. 25 (d) and the physical information table shown in FIG. 26 (d), the number of routes is 8 and the maximum number of transmission / reception ports is 36. It becomes possible to operate as a system. That is, the operation mode of this embodiment can be changed only by changing the logical information table and the physical information table. Control other than the logical / physical conversion table in the process of changing the optical component and the physical configuration conversion to the optical path setting request. No process changes are required.

  The effects of the optical subsystem of the present embodiment are summarized as follows. As an example, consider a case where an optical subsystem manufacturer employs the optical component configuration of FIG. 23a as a branching switch and employs the optical component configuration of FIG. For example, when it is necessary to manufacture optical subsystems with different numbers of routes, if the optical subsystem is based on this control method, the optical component and the optical component can be simply changed by changing the logical-physical conversion table of the physical control function unit. There is no need to change the control process and the control flow other than the control process related to the driver that drives and the logical-physical conversion table. The change of the logical-physical conversion table can be rewritten by, for example, a command from a host device that controls the optical subsystem. By using the control method of the present invention, it is possible to cope with various numbers of routes with one optical subsystem, and it is possible to reduce the cost and time required for manufacturing the optical subsystem.

10: Node management controller 11, 11 ′, 11 ″: Optical subsystem 21: Branch switch 22: Junction switch 31: Branch side path selection switch 32: Branch side wavelength assignment switch 33: Junction side path selection switch 34: Junction side wavelength assignment switch 41: receiver 42: transmitters 301-303: optical subsystem 401: optical nodes M1-M8: optical level monitor

Claims (8)

A branch switch having one input port and a plurality of output ports;
A merge switch having one output port and a plurality of input ports;
A logical control function,
A physical control function unit;
An optical subsystem comprising:
The logical control function unit includes:
When there is an optical path setting request in the logical control function unit, determine whether or not the optical path setting request is possible with reference to a connection state transition diagram regarding the connection of the branch switch and the junction switch,
When optical path setting is possible, the optical path setting request is transmitted to the physical control function unit,
The physical control function unit
When the optical path setting request is received from the logical control function unit, a combination that can be connected between the input port and the output port of the branch switch and the output port and the input port of the junction switch is described. Referring to a logical information table and a physical information table that describes physical information of the branch switch and the merging switch, physical configuration conversion is performed on the optical path setting request, and whether or not the branch switch and the merging switch can be set. And
When the switch setting is possible, the switch setting is transmitted to a driver of the branch switch and the merge switch to drive the branch switch and the merge switch. A branch switch having one input port and a plurality of output ports;
A merge switch having one output port and a plurality of input ports;
A logical control function,
A physical control function unit;
An optical level monitor disposed on each of the input port of the branch switch, at least M output ports of the branch switch, the output port of the junction switch, and at least M input ports of the junction switch; ,
An optical subsystem comprising:
The logical control function unit includes:
When there is an optical signal level monitor request, refer to the connection state transition diagram relating to the connection of the branch switch and the junction switch and the optical level state transition diagram of the optical signal level monitor point of the optical signal level monitor request. Determine whether a signal level monitor request is possible,
If optical signal level monitoring is possible, send the optical signal level monitor request to the physical control function unit,
The physical control function unit
A combination that is connectable between the input port and the output port of the branch switch and the output port and the input port of the junction switch when the optical signal level monitor request is received from the logical control function unit. A physical configuration conversion is performed on the optical signal level monitor request with reference to the logical information table and the physical information table describing physical information of the branch switch and the junction switch, and the optical signal level of the optical signal level monitor request Determine whether the optical signal level can be measured at the monitor point,
When the optical signal level measurement is possible, the optical signal level monitor request is transmitted to the driver of the optical level monitor at the optical signal level monitor point to drive the optical level monitor, and the light at the optical signal level monitor point is Get signal level measurements,
An optical subsystem characterized by performing physical configuration conversion on an optical signal level monitor measurement value acquired by referring to the logical information table and the physical information table and notifying the logical control function unit. A branch switch having one input port and a plurality of output ports;
A merge switch having a light intensity adjustment function for adjusting the light intensity of an optical signal output from one output port and a plurality of input ports and the output port;
A logical control function,
A physical control function unit;
An optical level monitor disposed at the output port of the junction switch;
An optical subsystem comprising:
The logical control function unit includes:
When there is an ALC (Auto Level Control) request, a connection state transition diagram regarding the connection of the branch switch and the junction switch, an optical level state transition diagram of an optical signal level monitor point where the optical level monitor is arranged, and Determine whether ALC is possible with reference to the ALC transition state diagram of the output port of the ALC request,
If ALC is possible, notify the physical control function unit of the merging switch of the ALC request,
The physical control function unit
The combination that can be connected between the input port and the output port of the branch switch and the output port and the input port of the merging switch when the ALC request is notified from the logical control function unit is described. After performing a physical configuration conversion on the ALC request with reference to a logical information table and a physical information table describing physical information of the branching switch and the merging switch , the ALC request is sent to the optical signal level monitoring point. An optical signal level measurement request is transmitted to a driver of the optical level monitor to drive the optical level monitor to obtain an optical signal level measurement value at the optical signal level monitor point, and a preset ALC target value and An optical signal attenuation amount setting is determined based on the optical signal level measurement value, and the attenuation amount setting is determined by the driver of the light intensity adjustment function. It performs feedback for driving the light intensity adjustment function transmitted,
An optical subsystem characterized by that.   The apparatus further comprises a setting change function unit that changes a combination of optical paths that can be set by changing settings of the logical information table and the physical information table of the physical control function unit. An optical subsystem as described in. A branch switch having one input port and a plurality of output ports;
A merge switch having one output port and a plurality of input ports;
A logical control function,
A physical control function unit;
An optical subsystem control method for an optical subsystem comprising:
When there is an optical path setting request in the logical control function unit, the logical control function unit determines whether or not the optical path setting request is possible with reference to a connection state transition diagram regarding the connection of the branch switch and the junction switch. Judgment,
When optical path setting is possible, the logical control function unit transmits the optical path setting request to the physical control function unit,
The logical control function unit that has received the optical path setting request describes a combination that can be connected between the input port and the output port of the branch switch and the output port and the input port of the junction switch. Physical configuration conversion is performed on the optical path setting request with reference to an information table and a physical information table describing physical information of the branch switch and the junction switch, and whether or not the branch switch and the junction switch can be set. Judgment,
When the switch setting is possible, the physical control function unit transmits the switch setting to a driver of the branch switch and the merging switch to drive the branch switch and the merging switch. System control method. A branch switch having one input port and a plurality of output ports;
A merge switch having one output port and a plurality of input ports;
A logical control function,
A physical control function unit;
The optical level disposed at each of the input port of the branch switch, the output port of part or all of the branch switch, the output port of the junction switch, and the input port of part or all of the junction switch A monitor,
An optical subsystem control method for an optical subsystem comprising:
When there is an optical signal level monitor request in the logical control function unit, the logical control function unit displays a connection state transition diagram relating to the connection of the branch switch and the junction switch and the optical signal level of the optical signal level monitor request. Determine whether or not the optical signal level monitor request is possible with reference to the optical level state transition diagram of the monitor point,
When the optical signal level monitor is possible, the logical control function unit transmits the optical signal level monitor request to the physical control function unit,
The physical control function unit that has received the optical signal level monitor request described a combination that can be connected between the input port and the output port of the branch switch and the output port and the input port of the junction switch. An optical signal level monitor for the optical signal level monitor request is obtained by performing physical configuration conversion on the optical signal level monitor request with reference to a logical information table and a physical information table describing physical information of the branch switch and the junction switch. Determine whether or not to measure the optical signal level at a point,
If the optical signal level measurement is possible, the physical control function unit sends the optical signal level monitor request to the driver of the optical level monitor at the optical signal level monitor point to drive the optical level monitor, Obtaining an optical signal level measurement value of the optical signal level monitoring point;
The optical control function unit performs physical configuration conversion on an optical signal level monitor measurement value acquired by referring to the logical information table and the physical information table, and notifies the logical control function unit of the optical sub-characteristic. System control method. A branch switch having one input port and a plurality of output ports;
A merge switch having a light intensity adjustment function for adjusting the light intensity of an optical signal output from one output port and a plurality of input ports and the output port;
A logical control function,
A physical control function unit;
An optical level monitor disposed at the output port of the junction switch;
An optical subsystem control method for an optical subsystem comprising:
When there is an ALC (Auto Level Control) request, the logical control function unit displays a connection state transition diagram relating to the connection of the branch switch and the junction switch, and an optical signal level monitor point where the optical level monitor is arranged. Determine whether ALC is possible with reference to an optical level state transition diagram and an ALC transition state diagram of the output route of the ALC request,
When ALC is possible, the logical control function unit notifies the physical control function unit of the merging switch of the ALC request,
The logical information describing the combinations that the physical control function unit notified of the ALC request can connect between the input port and the output port of the branch switch and the output port and the input port of the junction switch The ALC request is subjected to physical configuration conversion with reference to a table and a physical information table describing physical information of the branch switch and the merging switch, and then the ALC request is converted into an optical signal at the optical signal level monitoring point. The level measurement request is transmitted to the driver of the optical level monitor to drive the optical level monitor to obtain the optical signal level measurement value at the optical signal level monitor point, and to set the ALC target value and the optical Determine the attenuation setting of the optical signal based on the measured signal level, and send the attenuation setting to the driver of the light intensity adjustment function It performs feedback for driving the light intensity adjustment function Te,
An optical subsystem control method.
  8. The optical subsystem control method according to claim 5, wherein a combination of optical paths that can be set is changed by changing settings of the logical information table and the physical information table.

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