JP2001094512A - Optical line monitor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical line monitor system which reduces optical loss as much as possible, facilitates installation and handling, and improves the reliability of a transmission system. SOLUTION: This system is an optical line monitor system A which monitors an optical line 50 of a transmission system 1 performing optical communication by connecting a master device 10 and slave devices 20 through optical lines 40 and 50 and a wavelength router 70, and the optical line monitor system A is equipped with a tester 91 which sends and receives a monitoring optical signal λ' for monitoring the slave device side optical line 50, a slave device 20 having a reflecting means for reflecting the monitoring optical signal λ', and a monitoring optical line 41 connecting the tester 91 and wavelength router 70 together. Then the tester 91 sends the monitoring optical signal λ' to the slave device 20 through the wavelength router 70 and receives the monitoring optical signal λ' reflected by the mentioned reflecting means to monitor the slave-device side optical line 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical line monitoring system for monitoring the state of an optical line in a transmission system for performing optical communication such as a telephone communication system.

[0002]

2. Description of the Related Art A master device 110 and a slave device 120 (120)
120m) and the optical multiplexer / demultiplexer 130,
The common optical line 140 and the slave device side optical line 150 (15
0a, 150b,... 150m), a conventional example of the configuration of an optical line monitoring system in a transmission system 100 (also referred to as “point-multipoint optical communication system 100”) will be described with reference to FIG. Testing machine 19
1. Test control device 192, fiber core selection device 19
3, and the optical branch module 194 (194a / 194b)
.. 194 m)
It is placed between the slave device 120 and the optical multiplexing / demultiplexing device 130, and monitors each of the slave device-side optical paths 150. At this time, a large optical loss occurs due to the power splitting in the optical splitting module 194, which undesirably affects the received light power level in the main device 110 and / or the slave device 120. In addition, the master device 110 and the slave device 1
In order to keep the received light power level at 20 (120a, 120b,... 120m) high and to enable transmission at a high bit rate, as shown in FIG.
A transmission system 100 'is known which uses a wavelength router 170 with a small optical loss instead of (shown in FIG. 16) and performs communication using an optical signal having a wavelength that matches the routing characteristics of the wavelength router 170. In this transmission system 100 ′, an optical line monitoring device 190 ′ is provided with a slave device side optical line 150.
An optical line monitoring system for monitoring each one of the slave device side optical lines 150 is used.

[0003]

However, since the optical line monitoring device 190 'is inserted in the middle of the slave device side optical line 150 for monitoring the optical line, a large optical loss due to power branching occurs. There are drawbacks. Also,
Also in the case of the optical line monitoring device 190 ', each of the slave device-side optical lines 150 must be connected to the optical line monitoring device 190', which is disadvantageous in that installation and handling are inconvenient. there were. As described above, in the conventional optical line monitoring systems 100 and 100 ', the optical line monitoring device 19
However, there is a problem that a large light loss due to 0.190 ′ occurs constantly and a problem that installation and handling are inconvenient. In addition, monitoring of the optical line 140 connecting the main unit 110 and the optical multiplexer / demultiplexer 130 (FIG. 16) and monitoring of each optical line 150 connecting the main unit 110 and the wavelength router 170 (FIG. 17)
There was a problem that can not be performed. Therefore, an object of the present invention is to provide an optical line monitoring system capable of minimizing optical loss as much as possible, easily installing and handling, and improving the reliability of a transmission system.

[0004]

Means for Solving the Problems In order to solve the above problems, the present inventors have conducted intensive studies and completed the present invention. That is, the present invention provides an optical line for monitoring an optical line in a transmission system in which optical communication is performed by connecting a main device and a plurality of subordinate devices via an optical line via a multiple-input multiple-output passive wavelength router. It is a monitoring system.
The optical line monitoring system comprises: a tester that transmits and receives monitoring optical signals of a plurality of wavelengths for monitoring a slave device side optical line that connects a slave device and the wavelength router among the optical lines; And an optical line monitoring device including a test control device for controlling the optical path control. In addition, each of the slave devices of the transmission system includes a reflection unit that reflects the monitoring optical signal. Further, the tester and the input port of the wavelength router to which the main device is connected are connected by a monitoring optical line. And the testing machine is
The monitoring optical signal is transmitted to the slave device via the wavelength router, and the monitoring optical signal reflected by the reflection unit provided in the slave device is received again via the wavelength router, and Thus, monitoring of the optical line on the side of the former slave device is performed (claim 1).

According to this configuration, the monitoring optical signal of a predetermined wavelength transmitted from the tester passes through a specific slave device side optical line according to the wavelength of the monitoring optical signal due to the routing characteristics of the wavelength router. To reach a particular slave device. Then, the light is reflected by the slave device, passes through a specific slave device-side optical line, and is returned to the tester by the routing characteristics of the wavelength router. Thus, it is possible to monitor an abnormality such as the presence or absence of a disconnection in the optical line on the slave device side without causing optical loss due to power branching. The tester can transmit and receive monitoring optical signals of different wavelengths at least as many as the number of slave devices.

In the optical line monitoring system according to the present invention, the wavelength router is connected to an output port on the side to which the plurality of subordinate devices are connected, in a main device side connecting the main device and the wavelength router. It has a monitoring output port for monitoring the optical line, and transmits an optical signal transmitted from the main device as a monitoring optical signal to the monitoring output port, thereby allowing the main device-side optical line to be transmitted. Monitoring can be performed (claim 2).

According to this configuration, the main unit transmits the monitoring optical signal. The monitoring optical signal reaches the output port to which the slave device of the wavelength router is not connected via the main device side optical line without power splitting. On the basis of the arrived monitoring optical signal, it is possible to monitor an abnormality such as the presence / absence of disconnection of the main device side optical line. In the monitoring optical signal transmitted by the main device, the wavelength reaching the output port (monitoring output port) to which the slave device of the wavelength router is not connected is set according to the routing characteristics of the wavelength router.

In the optical line monitoring system according to the present invention, the monitoring optical signal transmitted from the main device to the monitoring output port is transmitted to the main device by one of the following means or means. Or input to the testing machine,
The main device side optical line can be monitored (claim 3). (Means) The monitoring output port includes a reflection unit, and reflects the monitoring optical signal transmitted from the main unit at the reflection unit, and transmits the monitoring optical signal to the main unit via the wavelength router and the main unit side optical line. input. (Means) The monitoring output port and the tester are connected by an optical line, and a monitoring optical signal transmitted from the main device is input to the tester via the optical line.

According to the means, the monitoring optical signal arriving at the monitoring output port is reflected by the reflector, and is returned to the main apparatus without being branched according to the routing characteristics of the wavelength router. Whether or not the main device side optical line is disconnected can be determined by the main device or the optical line monitoring device. According to the means, the monitoring optical signal arriving at the monitoring output port is input to the tester through a dedicated optical line. Whether or not the main device side optical line is disconnected can be determined by the optical line monitoring device.

In the optical line monitoring system according to the present invention, the reflecting means provided in the slave device may be one of the following reflecting means or reflecting means. . (Reflection Means) The slave device has a filter for multiplexing / demultiplexing optical signals in a plurality of wavelength bands, and this filter allows the monitoring optical signal transmitted from the optical line monitoring device and the monitoring optical signal transmitted from the main device. The optical signal for communication is split (branched),
The monitoring optical signal transmitted from the optical line monitoring device out of the split optical signal is reflected by the reflection unit, and the reflected monitoring optical signal is guided to the original optical line through the filter, and the main device Reflecting means for multiplexing with a communication optical signal to be transmitted and received. (Reflection Means) The slave device has a filter that transmits only an optical signal in a specific wavelength band among optical signals in a plurality of wavelength bands and reflects an optical signal in another wavelength band. Reflection means for transmitting a communication optical signal from the main device and reflecting a monitoring optical signal from the optical line monitoring device;

According to the reflecting means and the reflecting means, only the monitoring optical signal is reflected. Therefore, it is possible to monitor the optical line on the slave device side while performing the optical communication.

In the optical line monitoring system of the present invention, when there are a plurality of the transmission systems to be monitored,
The input ports of the respective wavelength routers included in the plurality of transmission systems and the tester are connected to respective monitoring optical lines via optical switches, and by switching the optical switches, among the plurality of transmission systems, Monitoring of the optical line in any transmission system can be performed (claim 5).

According to this configuration, even if there are a plurality of transmission systems to be monitored, the transmission can be monitored by one optical line monitoring device.

In the optical line monitoring system of the present invention, the main unit and the tester are connected by an optical line, and the main unit transmits and receives an optical signal transmitted and received by the main unit and the tester. A multiplexing / demultiplexing unit for multiplexing / demultiplexing the monitoring optical signal may be provided, and the main device side optical line may also serve as the monitoring optical line. Then, the tester transmits and receives a monitoring optical signal for monitoring the optical path on the slave device side via the optical line on the main device side (claim 6).

According to this configuration, the monitoring of the optical line on the slave device side and the monitoring of the optical line on the main device side can be performed simultaneously. The monitoring optical signal for monitoring the main device side optical line is:
Transmitted by main unit or tester. When the monitoring optical signal is transmitted by the main device, an unused one of the communication optical signals can be used as a monitoring optical signal for monitoring the main device side optical line. When the monitoring optical signal is transmitted by the tester, an unused optical signal for monitoring the optical path on the slave device side is used as a monitoring optical signal for monitoring the optical path on the main apparatus side. be able to. Note that n and N in this specification mean a number of 2 or more, and do not necessarily mean the 14th alphabet. Similarly, m
Means a number of 2 or more smaller than n.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, a transmission system to which the optical line monitoring system according to the present embodiment is applied will be described.

{Transmission System} As shown in FIG. 1, the transmission system 1 includes a master device 10 and a slave device 20 (20a · 2).
20b), the wavelength router 70, the main device side optical line 40 connecting the main device 10 and the wavelength router 70, the wavelength router 7
0 and the slave device side optical line 50 (50a
.50b.. .50m). The transmission system 1 performs point-multipoint optical communication.

The main unit 10 can transmit a communication optical signal λ of a plurality of wavelengths to the subordinate unit 20. In addition, the main device 10 can receive communication optical signals λ of a plurality of wavelengths from the subordinate device 20.

The slave device 20 transmits a (one) signal of a specific wavelength among the communication optical signals λ of a plurality of wavelengths transmitted by the master device 10.
In addition to receiving the communication optical signal λ, the communication optical signal λ having the same wavelength as the communication optical signal λ of the specific wavelength received toward the main device 10 can be transmitted.

As described above, the optical line composed of an optical fiber and the like is composed of the main unit side optical line 40 and the slave unit side optical line 50 (5).
0a, 50b,... 50m), each of which is monitored by the optical line monitoring system A. The slave device side optical line 50 is connected to the wavelength router 70 and the slave device 20 (20).
a, 20b,... 20m). The main device side optical line 40 transmits (guides) a communication optical signal λ on which a plurality of wavelengths are superimposed.

The wavelength router 70 used in the present embodiment
Is a wavelength router with n-port input and n-port output. In the present embodiment, the port of the wavelength router 70 to which the main device 10 is connected is connected to the input port unit 70P.
The port to which the slave device 20 is connected is referred to as an output port unit 70Q. The input port unit 70P has a plurality of input ports. Of these multiple input ports,
The main device 10 is connected to one input port via the main device side optical line 40. The output port unit 70Q also has a plurality of output ports, and the slave devices 20 (20a, 20b,..., 20m) are connected to the respective slave devices 20 (50a, 50b,. It is connected.

Here, the operating principle of the wavelength router 70 will be described with reference to FIG. FIG. 2 is a diagram illustrating functions of the wavelength router. The input port 70P of the wavelength router 70
It has n input ports from 0Pa to 70Pn.
The output port unit 70Q also has n output ports 70Qa to 70Qn.

The wavelength router 70 has an input port 70Pa.
Each of the 70Pb... 70Pn has a periodic wavelength demultiplexing characteristic (routing characteristic), and an optical signal of a specific wavelength input to a specific input port is passively output (routed) to a specific output port. You. Specifically, for example, when an optical signal having a wavelength λk is input to the input port 70P i-1,
Of the n output ports 70Q, output port 70Qn-
Routed to 2. Similarly, the input port 70Pi
When an optical signal having a wavelength λk is input to the input port 70Pi adjacent to the output port 70Qn-2, it is routed to the output port 70Qn-1 adjacent to the output port 70Qn-2. Also,
When an optical signal having the wavelength λj is input to the input port 70Pi-1, the output port 70Q to which the wavelength λk is routed.
n-2 is routed to the next output port 70Qn-1. In this case, the input / output wavelength difference dλ between adjacent ports
Is dλ = λj−λk.

On the other hand, the output port of the wavelength router 70 also has a periodic wavelength demultiplexing characteristic (routing characteristic) for each of the output ports 70Qa, 70Qb,. Optical signals are passively routed to specific input ports. Specifically, for example, when an optical signal having a wavelength λk is input to the output port 70Qn-2, the optical signal is routed to the input port 70Pi-1 of the n input ports 70P. Similarly, when an optical signal having a wavelength λk is input to the output port 70Qn-1 adjacent to the output port 70Qn-2, the input port 70Pi-1
Is routed to the input port 70P i next to When an optical signal having a wavelength λj is input to the output port 70Qn-1, the optical signal is routed to the input port 70Pi-1 adjacent to the input port 70Pi to which the wavelength λk is routed. Also in this case, the input / output wavelength difference dλ between adjacent ports is dλ = λj−λk.

That is, the optical signal of the wavelength λk input to the input port 70Pi-1 is always routed to the output port 70Qn-2. Conversely, the optical signal of the wavelength λk input to the output port 70Qn-2 is always routed to the input port 70Pi-1. Similarly, input port 70P
The optical signal of wavelength λk input to i is output to output port 70Qn
Always routed to -1. Conversely, output port 70Q
The optical signal of wavelength λk input to n-1 is
Always routed to Pi. Also, input port 7
The optical signal of the wavelength λj input to 0Pi-1 is always routed to the output port 70Qn-1. Conversely, the optical signal of the wavelength λj input to the output port 70Qn-1 is always routed to the input port 70Pi-1. As described above, for the optical signal input to the wavelength router 70, if the position and the wavelength of the input port (output port) are determined, the output port (input port) to be automatically routed is determined.

In the transmission system 1 to which the optical line monitoring system A of the present embodiment is applied, the main unit 10 and the subordinate unit 2 are connected by the wavelength router 70 without crosstalk.
Optical communication can be carried out between 0 and 0. That is, the main device 10 can communicate with any subordinate device 20 by selecting the wavelength of the communication optical signal λ. On the other hand, the slave device 20 can communicate with the main device 10 by transmitting the communication optical signal λ having the same wavelength as the received communication optical signal λ.

Next, an optical line monitoring system of the present embodiment for monitoring the presence or absence of disconnection of an optical line in the above-described transmission system will be described in accordance with the following first to fourth embodiments. Note that the first embodiment and the second embodiment
In the optical line monitoring system according to the embodiment, the monitoring optical signal from the optical line monitoring device is transmitted to the wavelength router using a unique optical line (monitoring optical line). In the optical line monitoring systems according to the third and fourth embodiments, the main device side optical line also functions as a monitoring optical line. In any of the embodiments, monitoring of the optical line on the master device side and the optical line on the slave device side can be performed.

First Embodiment An optical line monitoring system according to a first embodiment will be described with reference to FIG. Since the transmission system of the first embodiment has the same configuration and function as the transmission system 1 described above, the same elements and members in the transmission system are denoted by the same reference numerals,
The description is omitted.

[Configuration of Optical Line Monitoring System] The optical line monitoring system A1 of the first embodiment includes an optical line monitoring device 9
0, a monitoring optical line 41 connecting the optical line monitoring device 90 and the input port unit 70P of the wavelength router 70, an optical line 51 connecting the output port unit 70Q of the wavelength router 70 and the optical line monitoring device 90, and the slave device 20. It is configured to include the provided reflection means (see FIG. 1).

(1) The configuration of an optical line monitoring system for monitoring an optical line on a slave device side will be described. Optical line monitoring device 90
Is configured to include a multi-wavelength compatible test machine 91 (hereinafter referred to as “test machine 91”) and a test control device 92 that controls the test machine 91. The tester 91 can transmit the monitoring optical signals λ ′ of a plurality of wavelengths to the specific slave device 20 via the wavelength router 70 for each wavelength of the monitoring optical signal λ ′ (this point). Will be described later). In addition, testing machine 9
1 can receive, via the wavelength router 70, the monitoring optical signal λ ′ reflected by the reflection means included in the slave device 20. The monitoring optical signal λ ′ transmitted and received by the tester 91 has a different frequency band from the communication optical signal λ transmitted and received by the main device 10 so as not to hinder communication in the transmission system 1. By the way, test machine 9
1 (optical line monitoring device 90) transmits a monitoring optical signal λ ′ of a specific wavelength to a specific slave device 20, and transmits a specific slave device 2
By receiving (detecting) the monitoring optical signal λ ′ of the specific wavelength reflected by 0, the presence or absence of disconnection of the optical line is monitored. Further, the test control device 92 controls the optical line monitoring system A comprehensively, transmits the monitoring optical signal λ ′, and determines whether or not the slave device side optical line 50 is abnormal.

The slave units 20 each have a reflecting means. This reflecting means has a role of reflecting the monitoring optical signal λ ′ transmitted from the tester 91 and returning the same to the tester 91.
On the other hand, the reflection means allows the communication optical signal λ transmitted from the main device 10 to pass. Therefore,
The communication optical signal λ reaches the transmission / reception unit 21 (see FIG. 3) provided in the slave device 20 without being reflected by the reflection unit. In addition, the transmitting and receiving unit 21 is used as the reflection unit.
The communication optical signal λ transmitted toward 0 is allowed to pass.
Thereby, the slave device side optical line 50 can be monitored without obstructing communication between the main device 10 and the slave device 20.

FIGS. 3 to 5 show specific examples of the structure of the reflection means.
This will be described with reference to FIG. FIG. 3 shows an example of the reflection means.
The configuration shown in FIG. In this case, the reflection unit is configured to include the filter F1 and the reflection unit R1. This filter F1 has the characteristics shown in FIG. That is, when the communication optical signal λ and the monitoring optical signal λ ′ are superimposed and input to the filter F1 (see FIG. 4A), the filter F1 changes the communication optical signal λ and the monitoring optical signal λ in accordance with the wavelength. The optical signal λ ′ is separated. Then, the communication optical signal λ is guided to the transmission / reception unit 21 on the subsequent stage. As a result, the communication optical signal λ is input to the transmission / reception unit 21. On the other hand, the filter F1 guides the monitoring optical signal λ ′ to the reflection unit R1 on the subsequent stage. Reflector R
The monitoring optical signal λ ′ guided to 1 is reflected here, returns to the filter F 1 again, and is sent out to the slave device side optical line 50. The communication optical signal λ transmitted by the transmitting / receiving unit 21
Is also sent out to the slave device side optical line 50 through the filter F1. Here, as shown in FIG. 4B, the filter F1 includes a frequency band of the communication optical signal λ (λa · λb ·· λn) and a monitoring optical signal λ '(λ'a · λ'b ···). λ′n) can be separated. The reflector R1 is not limited to a specific one as long as it can reflect the monitoring optical signal λ ′, and may be, for example, a vertically cut optical fiber.

FIG. 3 shows another example of the reflection means.
The configuration shown in FIG. In this case, the filter F2 is a main component of the reflection means. This filter F2 has the characteristics shown in FIG. That is, when the communication optical signal λ and the monitoring optical signal λ ′ are superimposed and input to the filter F2 (see FIG. 5A), the filter F2
Transmits the communication optical signal λ according to the wavelength and reflects (Fresnel reflection) the monitoring optical signal λ ′. The transmitted communication optical signal λ is input to the transmission / reception unit 21 on the subsequent stage. The monitoring optical signal λ ′ reflected by the filter F2 is returned to the slave device side optical line 50. The communication optical signal λ transmitted by the transmission / reception unit 21 passes through the filter F2 without being reflected by the filter F2, and is sent to the slave device-side optical line 50. Here, as shown in FIG. 5B, the filter F2 includes a frequency band of the communication optical signal λ (λa, λb... Λn) and a monitoring optical signal λ ′ (λ′a λ′b. λ′n) is transmitted through one frequency band and reflects the other frequency band according to the wavelength (the reflected side is the frequency band of the monitoring optical signal λ ′).

The monitoring optical line 41 includes an optical line monitoring device 90.
And the wavelength router 70 are connected. The monitoring optical line 41 is connected to the input port 70 of the wavelength router 70.
It is connected to any one input port different from the input port to which the main device 10 of P (see FIG. 2) is connected. Here, the wavelength router 70 also has the same wavelength demultiplexing characteristics (routing characteristics) as for the communication optical signal λ for the monitoring optical signal λ ′. Therefore, the monitoring optical signal λ ′ transmitted from the tester 91 is routed to a specific output port of the wavelength router 70 according to the wavelength,
A particular slave device 20 is reached. In addition, the monitoring optical signal λ ′ that has reached the specific slave device 20 is reflected by the reflection unit, returns to the wavelength router 70 again, is routed according to the wavelength, and is received by the tester 91 that is the transmission source.

Here, a characteristic image of the wavelength router 70 will be described with reference to FIG. The wavelength router 70 converts the wavelength demultiplexing characteristics in the frequency band of the communication optical signal λ (λa, λb,... Λn) into the monitoring optical signal λ ′ (λ′a, λ′b,
.. Λ'n). Here, the communication optical signal λ1 and the monitoring optical signal λ′a are
a is routed to the output port to which it is connected,
The communication optical signal λb and the monitoring optical signal λ′b
0b is routed to the connected output port,
It is assumed that the communication optical signal λm and the monitoring optical signal λ'm are routed to an output port to which the slave device 20m is connected. In this case, #FSR (Free Spectrum Range) of the communication optical signal λa and the monitoring optical signal λ′a, #FSR of the communication optical signal λb and the monitoring optical signal λ′b, the communication optical signal λm and the monitoring The #FSRs of the optical signals λ′m all have the same value. That is, if the value of #FSR is the same even if the wavelength band is different, the routing characteristics in the wavelength router 70 are the same. Therefore, the monitoring optical signal λ ′ transmitted from the tester 91 also reaches the specific slave device 20 according to the wavelength, similarly to the communication optical signal λ transmitted from the main device 10. The monitoring optical signal λ ′ reflected by the reflection unit of the slave device 20 is received by the tester 91 that is the transmission source. In other words, the communication optical signal λ and the monitoring optical signal λ ′ having the same #Suffix (subscript) are routed to the same output port (input port). The characteristics of the wavelength router 70 have periodicity, and the same routing characteristics (wavelength demultiplexing characteristics) are obtained for each integral multiple of the value of #FSR.

(2) The configuration of the optical line monitoring system for monitoring the optical line on the main device side will be described. The main device 10 can transmit a monitoring optical signal λ ″ for monitoring the main device side optical line 40 in addition to the communication optical signals λ of a plurality of wavelengths.

The output port 70 Q of the wavelength router 70 is
A monitoring output port 70Qz for outputting a monitoring optical signal λ ″
Having. Then, the optical line 51 connects the monitoring output port 70Qz to the test device 91, receives the monitoring optical signal λ ″ transmitted by the main device 10 by the test device 91, and transmits the signal to the main device side optical line 40. Monitors for disconnections.

The wavelength of the monitoring optical signal λ ″ is a frequency in a wavelength band that does not hinder communication between the master device 10 and the slave device 20 and is connected to the monitoring output port 70 Qz due to the routing characteristics of the wavelength router 70. An optical signal of a frequency to be output (routed) is used. An optical signal of an unused wavelength (empty wavelength) of the communication optical signal λ can be assigned to the monitoring optical signal λ ″.

[Operation of Optical Line Monitoring System] The operation of the optical line monitoring system A1 of the first embodiment will be described with reference to FIG.

(1) Monitoring the optical line on the slave device side;
When monitoring the first slave device-side optical line 50a, the tester 91 transmits a monitoring optical signal λ′a having a frequency according to the routing characteristics of the wavelength router. The monitoring optical signal λ′a is routed by the wavelength router 70 and reaches the slave device 20a through the slave device side optical line 50a. The monitoring optical signal λ′a that has reached the slave device 20a is
The light is reflected by the reflection means and is received by the tester 91 along the original path. When the monitoring optical signal λ′a is received by the tester 91, it is determined that there is no abnormality such as disconnection in the slave device-side optical line 50a. Testing machine 91
, It is determined that there is an abnormality such as a disconnection in the optical path 50a on the slave device side. Also, the presence or absence of an abnormality in the optical line is monitored from the power level of the received monitoring optical signal λ ′. In addition, since light is reflected at the place where the abnormality has occurred, it is possible to monitor where the abnormality has occurred from the length of time that the transmitted monitoring optical signal λ ′ is reflected and returned. Here, the selection of the wavelength of the monitoring optical signal λ ′ transmitted by the tester 91 and the determination of the presence or absence of an abnormality in the optical line are performed by the test control device 92. By the way,
When monitoring the second slave device-side optical line 50b, the m-th slave device-side optical line 50m, and the like, the monitoring optical signals λ′b and λ′m having frequencies corresponding to the routing characteristics of the wavelength routers are respectively provided. By transmitting and receiving the test equipment 91 again, the presence / absence of an abnormality can be monitored.

(2) Monitoring of Optical Line on Main Unit: When monitoring the optical line 40 on the main unit, the main unit 10 transmits a monitoring optical signal λ ″ based on a command from the test control unit 92. . The monitoring optical signal λ ″ reaches the wavelength router 70 through the main device side optical line 40. Then, according to the routing characteristics of the wavelength router 70, the monitoring output port 70
The signal is routed (output) to Qz and received by the tester 91 through the optical line 51. When the monitoring optical signal λ ″ is received by the tester 91, it is determined that the main device side optical line 40 has no abnormality such as disconnection. If the signal is not received by the tester 91, it is determined that there is an abnormality such as a disconnection in the main device-side optical line 40. Also, the presence or absence of an abnormality in the optical line is monitored based on the power level of the received monitoring optical signal λ ″ and the length of the return time. Here, the test control device 92 adjusts the timing at which the main device 10 transmits the monitoring optical signal λ ″, and determines whether or not the optical line is abnormal.

As described above, according to the optical line monitoring system A1 of the first embodiment, since the communication optical signal and the monitoring optical signal are multiplexed / demultiplexed by the wavelength router, the optical loss due to the power branching is obtained. It is possible to monitor the abnormality of the optical line without causing the problem. Further, since the frequency band of the optical signal for monitoring is different from the frequency band of the optical signal for communication, communication in the transmission system is not hindered.

The monitoring optical signal λ ″ for monitoring the main unit side optical line 40 described above is input to the tester 91 via the optical line 51 connected to the monitoring output port 70Qz of the wavelength router 70. It is a configuration that is performed. Instead of this configuration,
As shown in FIG. 7, the monitoring output port 70Qz of the wavelength router 70 is provided with a reflection portion R2, and the monitoring output port 70Qz is provided.
The monitoring optical signal λ ″ output to z may be reflected. In the case of this configuration, the reflected monitoring optical signal λ ''
Is again received by the main device 10 through the main device side optical line 40 due to the routing characteristics of the wavelength router 70. The main device 10 converts the signal intensity of the received monitoring optical signal λ ″ into an electric signal and transmits the electric signal to the test control device 92, and the test control device 92 determines whether the main device side optical line 40 is disconnected or not. I do. As described above, the main unit side optical line can be monitored also by providing the reflection unit in the monitoring output port.

Second Embodiment An optical line monitoring system according to a second embodiment will be described with reference to FIG. In the second embodiment, a plurality of transmission systems are monitored by one optical line monitoring system A2.

[Configuration of Optical Line Monitoring System] The optical line monitoring system A2 of the second embodiment is similar to the optical line monitoring system A1 of the first embodiment, in that the slave device side optical line 5
0 and the main device side optical line 40 are monitored. However, there are N transmission systems 1 from system A to system N. Since each transmission system 1 (1A, 1B,... 1N) has the same configuration and function as the transmission system 1 of the first embodiment, the same reference numerals are given to the same elements and members, and Description is omitted. Similarly, the optical line monitoring system A2 has the same elements as those of the optical line monitoring system A1 of the first embodiment.
The same reference numerals are given to the members, and the description thereof will be omitted.

(1) The configuration of the optical line monitoring system for monitoring the optical line on the slave device side will be described. Optical line monitoring device 90
Has an optical switch 93 in addition to the tester 91 and the test controller 92. The optical switch 93 is connected to N wavelength routers 70, 70,... From the system A to the system N by N individual monitoring optical lines 41, 41,. The optical switch 93 is an optical path switch that switches an optical path based on a command from the test control device 92. This optical switch 93
, Any one of the N monitoring optical lines 41 can be selected. The wavelength router 7
The mode of connection between 0 and the monitoring optical path 41 is the same as in the first embodiment.

That is, the tester 91 is connected to the N monitoring optical paths 41 via the optical switch 93,
One monitoring optical line 41 selected by the optical switch 93
To transmit and receive the monitoring optical signal λ ′. The optical switch 93 allows the tester 91 to transmit and receive the monitoring optical signal λ ′ to and from the arbitrary slave device 20. Note that the slave device 20 is provided with the same reflection means as in the first embodiment, and reflects the monitoring optical signal λ ′ transmitted from the test device 91 and returns it to the test device 91 again. ing.

(2) The configuration of the optical line monitoring system for monitoring the optical line on the main device side will be described. Each transmission system 1A ・ 1
1N, as in the first embodiment, in addition to the communication optical signals λ of a plurality of wavelengths,
A monitoring optical signal λ ″ for monitoring 0 can be transmitted. The main device 10 of each system includes a test control device 9
2, and transmits a monitoring optical signal λ ″ according to a command from the test control device 92. The specific main device 10 that has been instructed by the test control device 92 transmits a monitoring optical signal λ ″, and the monitoring optical signal λ ″ is transmitted to the wavelength router 7.
The signal is output to the monitoring output port 70Qz through the optical line 0, and is input to the tester 91 through the optical line 51. In addition, when the monitoring optical signal λ ″ is input to the tester 91, there is no particular need to use an optical switch for switching an optical path. Main device 10
The transmission of the monitoring optical signal λ ″ is based on a command from the test control device 92, and the number of the master devices 10 is smaller than the number of the slave devices 20. Therefore, the test controller 92
Is the main device 10 in which system the input monitoring optical signal λ ″ is
Can easily be determined.

[Operation of Optical Line Monitoring System] The operation of the optical line monitoring system A2 according to the second embodiment will be described with reference to FIG.

(1) Monitoring the optical line on the slave device side;
The slave device-side optical line 50 (50) of the transmission system 1A of the system A
a, 50b,... 50m), the optical switch 9
The optical path is switched by 3 so that the monitoring optical signal λ ′ transmitted by the tester 91 reaches only the wavelength router 70 of the transmission system 1A. Then, as in the first embodiment, the monitoring optical signal λ ′ having a wavelength that reaches the specific slave device 20 is transmitted, and the slave device 20 (20a · 2) is transmitted.
. 0m... 20m) and the wavelength router 70 are individually monitored. Next, when monitoring the slave device side optical line 50 (50a, 50b,... 50m) of the transmission system 1B of the system B, the optical path is switched by the optical switch 93.
The monitoring optical signal λ ′ transmitted by the tester 91 is made to reach only the wavelength router 70 of the transmission system 1B. Then, the monitoring optical signal λ ′ is sequentially transmitted to monitor each of the slave device-side optical lines 50 (50a, 50b,..., 50m). Perform the same for other systems. The tester 91
May be the same as that transmitted to the system A and that transmitted to other systems. This is because, since the optical path is switched by the optical switch 93, there is no fear of crosstalk. Therefore, by providing the optical switch 93, it is not necessary to increase the number of monitoring optical signals λ ′ transmitted by the tester 91 even if the number of transmission systems to be monitored increases.

(2) Monitoring of the main device side optical line; For example, when monitoring the main device side optical line 40 of the transmission system 1A of the system A, the main device of the system A is controlled based on a command from the test control device 92. 10 transmits the monitoring optical signal λ ″ to the wavelength router 70. Thus, the main device side optical line 40 can be monitored in the same manner as in the first embodiment. The monitoring optical signal λ ″ transmitted by the main unit 10 is routed by the wavelength router 70 and the monitoring output port 7.
The light reaches the tester 91 via the optical line 51 at 0 Qz.
When monitoring the main device-side optical line 40 of another system, the test control device 92 issues a command to transmit a monitoring signal λ ″ to the main device 10 of the system to be monitored. Thereby, it is possible to monitor the main device side optical line 40 of an arbitrary system.

As described above, according to the optical line monitoring system of the second embodiment, even if the number of transmission systems to be monitored increases, the optical line can be monitored by one optical line monitoring device. Naturally, the wavelength router multiplexes and demultiplexes the optical signal for communication and the optical signal for monitoring, so that an abnormality in the optical line can be monitored without causing optical loss due to power branching. Further, since the frequency band of the optical signal for monitoring is different from the frequency band of the optical signal for communication, communication in the transmission system is not hindered.

The above-described monitoring optical signal λ ″ for monitoring the main unit side optical line 40 is transmitted via the optical line 51 connected to the monitoring output port 70Qz of the wavelength router 70 for each system. Is input to the tester 91. Instead of this configuration, as shown in FIG. 9, a reflection unit R2 is provided at the monitoring output port 70Qz of the wavelength router 70,
The configuration may be such that the monitoring optical signal λ ″ output to the monitoring output port 70Qz is reflected. In the case of this configuration, the reflected monitoring optical signal λ ″ passes through the main device side optical line 40 again and is received by the main device 10 due to the routing characteristics of the wavelength router 70. The main device 10 converts the signal strength of the received monitoring optical signal λ ″ into an electric signal and transmits the electric signal to the test control device 92.
It is determined whether there is a disconnection of 0 or the like. As described above, the main unit side optical line can be monitored also by providing the reflection unit in the monitoring output port.

Third Embodiment An optical line monitoring system according to a third embodiment will be described with reference to FIG. In the optical line monitoring system A3 according to the third embodiment, the main device-side optical line 40 also functions as a monitoring optical line.

[Structure of Optical Line Monitoring System] The optical line monitoring system A3 of the third embodiment is similar to the optical line monitoring system A1 of the first embodiment in that the optical line (subordinate) of one transmission system 1 is used. The device-side optical line 50 and the main device-side optical line 40) are monitored. Since the transmission system 1 has the same configuration and function as the transmission system 1 of the first embodiment, the same reference numerals are given to the same elements and members, and description thereof will be omitted. Similarly, for the optical line monitoring system A3, the same elements and members as those of the optical line monitoring system A1 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

(1) The configuration of the optical line monitoring system for monitoring the optical line on the slave device side will be described. In the third embodiment, the tester 91 is connected to the wavelength router 70 via the main device 10 and the optical line 42. The tester 91 is configured to transmit and receive the monitoring optical signal λ ′ via the optical line 42. Therefore, the monitoring optical path 41 (see FIG. 1 and the like) in the first embodiment and the second embodiment does not exist.

The main unit 10 is provided with multiplexing / demultiplexing means for multiplexing / demultiplexing the monitoring optical signal λ ′ and the communication optical signal λ transmitted by the main unit 10 (see FIG. 11). This multiplexing / demultiplexing unit has a filter F3, and multiplexes (superimposes) the monitoring optical signal λ ′ transmitted from the tester 91 and the communication optical signal λ transmitted from the main device 10 with the filter F3. Then, the combined optical signal (λ · λ ′) is guided to the main device side optical line 40. The multiplexing / demultiplexing means separates the monitoring optical signal λ ′ (reflected) from the slave device 20 and the communication optical signal λ with the filter F3, and transmits the communication optical signal λ to the transmitting / receiving unit. 11, and sends the monitoring optical signal λ ′ to the optical line 42 (that is, the tester 9).
It leads to 1).

The filter F3 of the multiplexing / demultiplexing means has a configuration shown in FIG.
, The frequency band of the communication optical signal λ (λa, λb... Λm) and the monitoring optical signal λ ′ (λ′a λ′b.
m) is separated from the frequency band according to the wavelength.

In addition, the slave device 20 and the main device side optical line 4
0, the wavelength router 70, the optical line 51, the tester 91, the test control device 92, and the like are the same as those in the first embodiment.

(2) The configuration of an optical line monitoring system for monitoring the optical line on the main device side will be described. The optical line monitoring system A3 of the third embodiment is different from the first embodiment and the like in that the tester 91 transmits a monitoring optical signal λ ″ for monitoring the main unit side optical line 40. The wavelength of the monitoring optical signal λ ″ passes through the filter F3 of the multiplexing / demultiplexing means,
A wavelength that is routed to the monitoring output port 70Qz of the wavelength router 70 is selected. Wavelength router 70,
The configuration of the optical line 51 and the like is the same as the configuration of the first embodiment. The monitoring optical signal λ ″ in the third embodiment is assigned an optical signal of an unused wavelength (vacant wavelength) among the monitoring optical signals λ ′.

[Operation of Optical Line Monitoring System] The operation of the optical line monitoring system A3 according to the third embodiment will be described with reference to FIG.

(1) Monitoring of the optical path on the slave device side: In the third embodiment, the monitoring optical signal λ ′ transmitted by the tester 91.
Is input to the wavelength router 70 via the optical line 42, the main device 10 (the filter F3), and the main device side optical line 40, and passes through the specified slave device side optical line 50 according to the routing characteristics of the wavelength router 70, and Is reached.
The monitoring optical signal λ ′ arriving at the slave device 20 is reflected by the reflection means, is again routed through the slave device-side optical line 50 and is routed by the wavelength router 70.
0, received by the tester 91 via the main device 10 (filter F3) and the optical line 42. As in the first embodiment, the presence or absence of an abnormality such as disconnection of the slave device-side optical line 50 is monitored based on the intensity level of the received monitoring optical signal λ ′ and the length of the returning time. The control of the test machine 91 and the determination of the presence or absence of an abnormality are performed by the test control device 92.

(2) Monitoring of Main Unit Optical Line In the third embodiment, a tester 91 for monitoring the main unit optical line 40 transmits a monitoring optical signal λ ″. The monitoring optical signal λ ″ transmitted by the tester 91 is input to the wavelength router 70 via the optical line 42, the main device 10 (the filter F3), and the main device side optical line 40, and is routed by the wavelength router 70. It is output to the monitoring output port 70Qz. The tester 91 receives the signal from the monitoring output port 70Qz via the optical line 51. Based on the intensity level of the received monitoring optical signal λ ″ and the length of the returning time, the presence or absence of an abnormality such as a disconnection in the main device side optical line 40 is monitored. The control of the test machine 91 and the determination of the presence or absence of an abnormality are performed by the test control device 92.

According to the optical line monitoring system of the third embodiment, in addition to the effects of the optical line monitoring system of the first embodiment, a dedicated optical line (monitoring light beam) connecting the tester and the wavelength router is provided. There is an effect that the road becomes unnecessary. For example, it is advantageous when the distance between the tester and the wavelength router is larger than that between the tester and the main device. Also,
In the case of the third embodiment, the monitoring optical signal for monitoring the slave device-side optical line passes through the master device-side optical line, so that the monitoring of the slave device-side optical line and the monitoring of the master device-side optical line are performed simultaneously. You can do it too.

As in the first embodiment, a reflection section R2 is provided at the monitoring output port 70Qz (see FIG. 13), and the monitoring optical signal λ ″ is reflected by the reflection section R2, and the wavelength router 7
After returning to 0, the test signal may be received by the tester 91 through the main device side optical line 40. In this case, the optical line 51 becomes unnecessary. This is advantageous when the distance between the tester 91 and the wavelength router 70 is large.

Fourth Embodiment An optical line monitoring system according to a fourth embodiment will be described with reference to FIG. In the fourth embodiment, as in the second embodiment, a plurality of transmission systems are monitored by one optical line monitoring system A4.

[Structure of Optical Line Monitoring System] The optical line monitoring system A4 according to the fourth embodiment is similar to the optical line monitoring system A3 according to the third embodiment, in that the slave device side optical line 5
0 and the main device side optical line 40 are monitored. However, as in the second embodiment, the transmission system 1 includes N
There are pieces. Note that each transmission system 1A, 1B,.
Since the transmission system 1 has the same configuration and function as the transmission system 1 of the third embodiment, the same reference numerals are given to the same elements and members, and description thereof will be omitted. Similarly, for the optical line monitoring system A4, the same elements and members as those of the optical line monitoring system A3 of the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

(1) The configuration of the optical line monitoring system for monitoring the optical line on the slave device side will be described. The optical line monitoring device 90 according to the fourth embodiment has an optical switch 93 in addition to the tester 91 and the test controller 92. This is the same as the second embodiment, but different from the third embodiment. The optical switch 93 includes N main devices 10 from the system A to the system N,
They are connected by N individual optical paths 42. The optical switch 93 is an optical path switch that switches an optical path based on a command from the test control device 92. This optical switch 93
Thus, any one of the N optical lines 42 can be selected. The connection between the main device 10 and the optical line 42 is the same as in the third embodiment.

That is, the tester 91 is connected to the N main units 10 from the system A to the system N via the optical switch 93, and monitors the main unit 10 of the system selected by the optical switch 93. The transmission optical signal λ ′ is transmitted (received). The optical switch 93 allows the tester 91 to transmit and receive the monitoring optical signal λ ′ to and from the slave device 20 (20a, 20b,..., 20m) of an arbitrary system. The slave device 20 is provided with the same reflection means as in the first to third embodiments, reflects the monitoring optical signal λ ′ transmitted from the test device 91, and returns it to the test device 91 again. It has become. Further, each of the main units 10 includes a multiplexing / demultiplexing unit as in the third embodiment, and the communication optical signal λ transmitted and received by the main unit 10.
And the monitoring optical signal λ ′ transmitted and received by the tester 91 can be multiplexed / demultiplexed.

(2) The configuration of the optical line monitoring system for monitoring the optical line on the main unit will be described. Transmission system 1 of each system
The transmission of the monitoring optical signal λ ″ for monitoring the (1A, 1B,... 1N) main device side optical line 40 is performed by the tester 91 (the main device 10 may perform the transmission). The monitoring optical signal λ ″ passes through the same path as the monitoring optical signal λ ′ to the wavelength router 70. Then, according to the routing characteristics of the wavelength router 70, the signal is output to the monitoring output port 70Qz. To which wavelength router 70 the monitoring optical signal λ ″ is transmitted is controlled by the test controller 92 via the optical switch 93. Monitoring output port 7
The monitoring optical signal λ ″ output to 0Qz passes through the optical line 51 and is input (received) to the tester 91. In addition, when the monitoring optical signal λ ″ is input to the tester 91, there is no particular need to use an optical switch for switching an optical path. The transmission of the monitoring optical signal λ ″ is based on a command from the test control device 92, and the number of the main device side optical lines 40 is smaller than the number of the slave device side optical lines 50. Therefore, the test controller 92 can easily determine which system the input monitoring optical signal λ ″ belongs to. Incidentally, the monitoring optical signal λ ″ in the fourth embodiment includes the monitoring optical signal λ ′.
Of these, optical signals of unused wavelengths (empty wavelengths) are allocated.

[Operation of Optical Line Monitoring System] The operation of the optical line monitoring system A4 of the fourth embodiment will be described with reference to FIG.

(1) Monitoring of the optical line on the slave device side;
The slave device-side optical line 50 (50) of the transmission system 1A of the system A
a, 50b,... 50m), the optical switch 9
The optical path is switched by 3 so that the monitoring optical signal λ ′ transmitted by the tester 91 reaches only the wavelength router 70 of the transmission system 1A. Then, as in the first embodiment and the like, the monitoring optical signal λ ′ having a wavelength reaching the specific slave device 20 is sequentially transmitted, and the slave device 20 (2
0a, 20b,... 20m) and the wavelength router 70 individually.
m) Monitor each one. Next, the slave device side optical line 50 (50a, 50b,... 50) of the transmission system 1B of the system B
When monitoring m), the optical path is switched by the optical switch 93 so that the monitoring optical signal λ ′ transmitted by the tester 91 reaches the wavelength router 70 of the transmission system 1B. Then, the monitoring optical signals λ ′ are sequentially transmitted, and each of the slave device-side optical lines 50 (50a, 50b,..., 50m) of the system B is monitored. Perform the same for other systems. Note that the monitoring optical signal λ ′ transmitted by the tester 91 may be the same as that transmitted to the system A and that transmitted to another system. This is because, since the optical path is switched by the optical switch 93, there is no fear of crosstalk.
Therefore, by providing the optical switch 93, it is not necessary to increase the number of monitoring optical signals λ ′ transmitted by the tester 91 even if the number of transmission systems to be monitored increases.

(2) Monitoring of the optical path on the main unit side: For example, when monitoring the optical line 40 on the main unit side of the transmission system 1A of the system A, the optical path of the optical switch 93 is changed based on a command from the test control unit 92. Then, the tester 91 transmits the monitoring optical signal λ ″ to the wavelength router 70 of the system A. Thereby, similarly to the case of the third embodiment or the like, the main device side optical line 40 of the system A can be monitored. In addition,
The monitoring optical signal λ ″ transmitted by the tester 91 is routed by the wavelength router 70, and the monitoring output port 70Q
z, and reaches the testing machine 91 via the optical path 51. When monitoring the main device side optical line 40 of another system, the test control device 92 switches the optical path of the optical switch 93 to the system to be monitored and issues a command to transmit the monitoring signal λ ″.
Thereby, it is possible to monitor the main device side optical line 40 of an arbitrary system.

As described above, according to the optical line monitoring system of the fourth embodiment, even if the number of transmission systems to be monitored increases, the optical line can be monitored by one optical line monitoring device. Naturally, the wavelength router multiplexes and demultiplexes the optical signal for communication and the optical signal for monitoring, so that an abnormality in the optical line can be monitored without causing optical loss due to power branching. Further, since the frequency band of the optical signal for monitoring is different from the frequency band of the optical signal for communication, communication in the transmission system is not hindered.

The monitoring optical signal λ ″ for monitoring the main unit side optical line 40 described above is input to the tester 91 via the optical line 51 connected to the monitoring output port 70Qz of the wavelength router 70. It is a configuration that is performed. Instead of this configuration,
As shown in FIG. 15, the monitoring output port 70Qz of the wavelength router 70 is provided with a reflection portion R2, and the monitoring output port 70Qz is provided.
The configuration may be such that the monitoring optical signal λ ″ output to Qz is reflected. In this configuration, the reflected monitoring optical signal λ ″ passes through the main device side optical path 40, the main device 10, and the optical switch 93 again due to the routing characteristics of the wavelength router 70, and is received by the tester 91. You. Test control device 92
Determines the presence or absence of an abnormality such as disconnection of the main device side optical line 40 and the location of the abnormality based on the signal level of the monitoring optical signal λ ″ received by the tester 91. As described above, the main unit side optical line can be monitored also by providing the reflection unit in the monitoring output port.

The optical line monitoring system of the present invention described above is not limited to the above embodiment of the present invention.
The present invention can be appropriately modified and implemented within a range that achieves the objects and effects of the present invention. For example, an optical line monitoring system that only monitors the optical line on the slave device side may be used. Further, two types of reflection means in the slave device may be mixed in one transmission system. Further, a monitoring output port with a reflection unit attached and a monitoring output port without a reflection unit may be mixed in one transmission system. In addition, the reflection means for reflecting the monitoring optical signal for monitoring the optical path on the slave device side may be incorporated in the slave device, or may be installed at a position close to the slave device in the optical line on the slave device side. Good. Similarly, the multiplexing / demultiplexing means may be installed in a position close to the main device in the main device-side optical line, in addition to being incorporated in the main device.

[0077]

According to the optical line monitoring system of the present invention,
The optical line can be monitored without causing optical loss due to power branching and without hindering communication. Also, installation and handling of the system is easy.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of an optical line monitoring system according to a first embodiment of the present invention, together with a configuration of a transmission system.

FIG. 2 is a diagram illustrating functions of a wavelength router.

FIG. 3 is a diagram illustrating a configuration of a reflection unit.
(A) shows a configuration provided with a reflection unit, and (b) shows a configuration in which a filter reflects a monitoring optical signal.

FIG. 4 is a diagram illustrating characteristics of a filter F1 in FIG.

FIG. 5 is a diagram illustrating characteristics of a filter F2 in FIG.

FIG. 6 is a diagram illustrating characteristics of a wavelength router.

FIG. 7 is a diagram showing a configuration of a modified example of the optical line monitoring system of FIG. 1;

FIG. 8 is a diagram illustrating a configuration of an optical line monitoring system according to a second embodiment of the present invention, together with a configuration of a transmission system.

FIG. 9 is a diagram illustrating a configuration of a modification of the optical line monitoring system of FIG. 8;

FIG. 10 is a diagram illustrating a configuration of an optical line monitoring system according to a third embodiment of the present invention, together with a configuration of a transmission system.

FIG. 11 is a diagram illustrating a configuration of a multiplexing / demultiplexing unit provided in a main device.

12 is a diagram illustrating characteristics of a filter F3 in FIG.

FIG. 13 is a diagram showing a configuration of a modified example of the optical line monitoring system of FIG. 10;

FIG. 14 is a diagram illustrating a configuration of an optical line monitoring system according to a fourth embodiment of the present invention, together with a configuration of a transmission system.

FIG. 15 is a diagram showing a configuration of a modified example of the optical line monitoring system of FIG.

FIG. 16 is a diagram showing a configuration of a conventional optical line monitoring system together with a configuration of a transmission system.

17 is a diagram showing a configuration of a conventional optical line monitoring system different from FIG. 16 together with a configuration of a transmission system.

[Explanation of symbols]

A Optical line monitoring system (A1, A2, A3, A
4) 90 optical line monitoring device 91 tester (multi-wavelength compatible tester) 92 test controller 93 optical switch 1 transmission system (1A, 1B, 1N) 10 main unit 20 subordinate device 40 main unit side optical line (light beam) Path) 41 optical line 42 optical line 50 slave device side optical line (optical line) 51 optical line 70 wavelength router 70P input port unit 70Q output port unit 70Qz monitoring output port F1 filter (in slave device) F2 filter (in slave device) F3 Filter (in the main unit) R1 Reflection unit (in the subordinate unit) R2 Reflection unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hitoshi Hashimoto 2-3-1 Otemachi, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor Yasuo Inoue 2-3-3 Otemachi, Chiyoda-ku, Tokyo No. 1 F-term in Nippon Telegraph and Telephone Corporation (reference) 2G086 CC01 CC06 5K002 BA05 BA06 BA21 EA06 EA07 FA01 GA03 5K019 AA08 AB07 BA51 CB04 CC07 CC14 CC16 5K069 BA09 CB10 DB33 EA24 EA25 EA27 EA29 HA00

Claims (6)

[Claims] An optical line monitor for monitoring an optical line in a transmission system for performing optical communication by connecting a main device and a plurality of subordinate devices via an optical line via a passive multiple input / output multiple wavelength router. This optical line monitoring system is a test for transmitting and receiving monitoring optical signals of a plurality of wavelengths for monitoring an optical device side optical line that connects the slave device and the wavelength router among the optical lines. And an optical line monitoring device including a test control device for controlling the test device, and a reflection unit for reflecting the monitoring optical signal to each of the slave devices of the transmission system, further comprising: And an input port on the side of the wavelength router to which the main device is connected, by a monitoring optical line, wherein the tester transmits the monitoring optical signal through the wavelength router. Transmitting to the slave device and receiving the monitoring optical signal reflected by the reflection means provided in the slave device again via the wavelength router, and monitoring the slave device-side optical line, Optical line monitoring system. 2. The monitoring apparatus according to claim 1, wherein the wavelength router is connected to an output port on a side to which the plurality of slave apparatuses are connected, for monitoring a main apparatus side optical line connecting the main apparatus and the wavelength router. An output port, wherein the optical signal transmitted from the main device is transmitted as the monitoring optical signal to the monitoring output port, thereby monitoring the main device-side optical line. Item 2. The optical line monitoring system according to Item 1. 3. A monitoring optical signal transmitted from the main device to the monitoring output port is input to the main device or the testing machine by one of the following means, and the main device side: The optical line monitoring system according to claim 2, wherein monitoring of the optical line is performed. The monitoring output port includes a reflection unit, and reflects the monitoring optical signal transmitted from the main device at the reflection unit, and inputs the monitoring optical signal to the main device via the wavelength router and the main device side optical line. . Means for connecting the monitoring output port and the tester via an optical line, and inputting a monitoring optical signal transmitted from the main unit to the tester via the optical line. 4. The optical line monitoring system according to claim 1, wherein the reflection unit provided in the slave device is any one of the following reflection units. The slave device has a filter for multiplexing / demultiplexing optical signals in a plurality of wavelength bands, and this filter allows the monitoring optical signal transmitted from the optical line monitoring device and the communication optical signal transmitted from the main device. And the monitoring optical signal transmitted from the optical line monitoring device is reflected by the reflecting portion of the separated optical signal, and the reflected optical signal is guided to the original optical line through the filter. Reflection means for multiplexing with the communication optical signal (λ) transmitted and received by the main device. The slave device has a filter that transmits only an optical signal in a specific wavelength band and reflects an optical signal in another wavelength band,
Reflecting means for transmitting the communication optical signal from the main device and reflecting the monitoring optical signal from the optical line monitoring device by the filter. 5. When there are a plurality of transmission systems to be monitored, the input ports of the wavelength routers of the plurality of transmission systems are connected to the tester via monitoring optical lines via optical switches. The light beam according to any one of claims 1 to 4, wherein an optical line in an arbitrary transmission system among the plurality of transmission systems is monitored by switching the optical switch. Road monitoring system. 6. The main device and the tester are connected by an optical line, and a communication optical signal transmitted and received by the main device and a monitoring optical signal transmitted and received by the test device are combined with the main device. The main device side optical line also serves as the monitoring optical line, and the tester transmits a monitoring optical signal for monitoring the slave device side optical line to the main device side optical line. The optical line monitoring system according to any one of claims 1 to 5, wherein the optical line monitoring system transmits and receives the signal via a communication line.