Optical transmission device, monitoring method, and monitoring program

Abstract

A signal quality conversion unit (16) of an optical transmission device (100) comprises: a quality measurement unit (161) that measures the signal quality of a measurement signal; an ASE light source (163) that transmits a noise signal for the measurement signal such that the noise signal is added to the path of the measurement signal; and an SN measurement unit (162) that uses the received measurement signal and noise signal to calculate a ratio between the measurement signal and the noise signal. The signal quality conversion unit (16) outputs conversion data indicating a relationship between the signal quality of the measurement signal measured by the quality measurement unit (161) and the ratio between the measurement signal and the noise signal measured by the SN measurement unit (162).

Description

[Technical Field]

[0001] The present invention relates to an optical transmission device, a monitoring method, and a monitoring program. [Background technology]

[0002] Optical transmission equipment that makes up optical transmission systems has generally been provided by a single vendor, making it difficult to interconnect equipment from different vendors. However, in recent years, there has been a growing trend to break vendor lock-in and enable flexible equipment combinations by introducing open standards and disaggregation. Open standards and disaggregation make it possible to adopt different vendor connection configurations between optical transmission equipment, and different vendor connection configurations between transponders, which are the transmitting and receiving parts, and the optical transmission equipment that houses those transponders.

[0003] Non-Patent Document 1 defines a method for connecting transponders and optical transmission equipment from different vendors as "Open ROADM MSA." However, Non-Patent Document 1 does not specify how the optical transmission equipment monitors the transponders, leaving it up to each vendor. The parameter monitored here is, for example, signal quality (BER: Bit Error Rate). Patent Document 1 describes a wavelength tracker as a transponder monitoring method, which identifies transponders by applying slow amplitude modulation to each optical signal channel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 6,968,131 [Non-patent literature]

[0005] [Non-Patent Document 1] Open ROADM, "Open ROADM MSA Device White Paper for release 7", [online], [Retrieved November 22, 2022], release 7 v1.2 11 / 05 / 2020, Internet〈URL:https: / / 0201.nccdn.net / 4_2 / 000 / 000 / 072 / 2aa / open-roadm-msa-release-7-device-white-paper-v1.2.pdf〉 Summary of the Invention [Problem to be solved by the invention]

[0006] The monitoring method of Patent Document 1 measures the signal quality of an optical signal flowing through an optical transmission device as a bit error rate (BER). Since the BER cannot be measured directly from the optical signal, it is necessary to convert the optical signal into an electrical signal and then measure the BER of the electrical signal. For this reason, we are considering a method in which a modulator that performs O / E (Optical / Electrical) conversion, such as the wavelength tracker described in Patent Document 1, is provided as a DSP (Digital Signal Processor) for each optical signal channel. With this method, the more monitoring points there are in the optical transmission equipment, the more modulators there will be, which raises concerns about higher costs, power consumption, and failure rates due to the increased number of parts. Furthermore, in a cross-vendor connection between a transponder and optical transmission equipment, the BER information measured by the transponder cannot be managed directly by the optical transmission equipment controller.

[0007] Therefore, a main object of the present invention is to make it possible to monitor the signal quality of an optical signal flowing within an optical transmission device even in an environment where different vendors are connected. [Means for solving the problem]

[0008] In order to solve the above problems, the optical transmission device of the present invention has the following features. The present invention provides an optical transmission device having a common unit that transmits an optical signal flowing through an optical fiber network, and a transponder unit that transmits an optical signal to be multiplexed / demultiplexed with respect to the optical signal flowing through the common unit, the common unit has a signal quality conversion unit that measures conversion data for converting the signal quality of the optical signal, The signal quality conversion unit a quality measurement unit that measures the signal quality of a received measurement signal by transmitting and receiving the measurement signal via a transponder of the transponder unit; a noise output unit that outputs a noise signal corresponding to the measurement signal so as to be added to a path of the measurement signal; a ratio measurement unit that calculates a ratio between the measurement signal and the noise signal from the received measurement signal and the noise signal, The conversion data indicates the relationship between the signal quality of the measurement signal measured by the quality measurement unit and the ratio of the measurement signal to the noise signal measured by the ratio measurement unit. [Effects of the Invention]

[0009] According to the present invention, it is possible to monitor the signal quality of an optical signal flowing through an optical transmission device even in an environment where different vendors are connected. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a configuration diagram of an optical transmission device according to an embodiment of the present invention. [Figure 2] 2 is a configuration diagram of a signal quality conversion unit used in the optical transmission device of FIG. 1 according to the present embodiment. [Figure 3] FIG. 2 is a hardware configuration diagram of an optical transmission device according to the present embodiment. [Figure 4] 1 is a configuration diagram of an optical transmission device according to an embodiment of the present invention. [Figure 5] 5 is a configuration diagram showing a first example of a signal quality conversion unit used in the optical transmission device of FIG. 4 according to the present embodiment. [Figure 6]5 is a configuration diagram showing a second example of the signal quality conversion unit used in the optical transmission device of FIG. 4 according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0012] FIG. 1 is a configuration diagram of an optical transmission device 100A. The optical transmission device 100A is configured by connecting a common unit 110 that transmits optical signals flowing through an optical fiber network and a transponder unit 120 that transmits optical signals to be multiplexed or demultiplexed with respect to the optical signals flowing through the common unit 110. The common unit 110 and the transponder unit 120 may be products of the same vendor or may be products of different vendors. The transponder unit 120 accommodates a transponder (TPND) that is a unit for transmitting and receiving an optical signal. In Fig. 1, an example is shown in which the transponder unit 120 accommodates a plurality of transponders including TPNDs 14a and 14b.

[0013] The common unit 110 has, as a transmission unit for optical signals, AMPs (Amplifiers) 11a and 11b that amplify optical signals, WSSs (Wavelength Selective Switches) 12a and 12b, and multiplexers / demultiplexers 13a and 13b that add and drop optical signals. 1, an optical signal input from optical fiber 19a passes through AMP 11a, WSS 12a, WSS 12b, and AMP 11b in this order from the left side of the drawing, and is output from optical fiber 19b. Optical fibers 19a and 19b are, for example, SMF (Single Mode Fiber). The multiplexer / demultiplexer 13a further demultiplexes the optical signals demultiplexed by the WSS 12a and outputs them to the TPNDs 14a and 14b. The multiplexer / demultiplexer 13b multiplexes the optical signals input from the TPNDs 14a and 14b toward the WSS 12b. In Fig. 1, the flow of the optical signals after being demultiplexed by the multiplexer / demultiplexer 13a and the flow of the optical signals before being multiplexed by the multiplexer / demultiplexer 13b are respectively indicated by dashed arrows.

[0014] Furthermore, the common unit 110 has a monitoring control unit (control unit) 18, an optical signal observing unit 15, and signal quality conversion units 16a and 16b as mechanisms for managing the transmission units of the optical signals. The signal quality conversion unit 16a measures conversion data for converting the signal quality of the optical signal. For example, the signal quality conversion unit 16a acquires SN / BER as conversion data for calculating (converting) the quality of the optical signal flowing from the multiplexer / demultiplexer 13a to the TPNDs 14a and 14b. The "SN" in SN / BER stands for optical signal-to-noise ratio (SN), and "BER" refers to the signal quality described above. SN / BER is not limited to the ratio between SN and BER, but is data indicating the relationship between SN and BER, and is used as conversion data for converting the signal quality of the optical signal (converting SN to BER). The signal quality conversion unit 16b obtains the SN / BER of the optical signals flowing from the TPNDs 14a and 14b to the multiplexer / demultiplexer 13b. In FIG. 1, N signal quality conversion units 16a, 16b, . . . are provided for N TPNDs 14a, 14b, . . . so that the signal quality conversion unit 16a and the TPND 14a have a one-to-one correspondence.

[0015] When communication of an optical signal flowing through the common part 110 begins, the optical signal observation part 15 observes the SN (ratio of data signal to noise signal) of the optical signal from monitoring points in each section of the optical signal transmission part (AMP11a → WSS12a → WSS12b → AMP11b). The monitoring control unit 18 monitors and controls the optical signal transmission unit. The monitoring control unit 18 calculates the signal quality (BER) of the optical signal using the conversion data (SN / BER) obtained by the signal quality conversion units 16a and 16b from the SN of the optical signal in each section observed by the optical signal observation unit 15. In this way, the monitoring control unit 18 monitors the signal quality of each section without O / E conversion of the optical signal to an electrical signal.

[0016] 1, the conversion interval of the signal quality conversion unit 16a (for example, between the multiplexer / demultiplexer 13a and the TPNDs 14a, 14b) and the observation interval of the optical signal observation unit 15 (for example, between the AMP 11a and the WSS 12a) are described as different intervals. However, even within the same device, the SN / BER may differ for each interval within the device. Therefore, the conversion interval of the signal quality conversion unit 16a may also be applied to the observation interval of the optical signal observation unit 15 as appropriate so that the conversion interval of the signal quality conversion unit 16a and the observation interval of the optical signal observation unit 15 are the same interval. As a result, the monitoring control unit 18 can calculate the BER of the optical signal with high accuracy by applying the SN / BER calculated in the conversion section of the signal quality conversion unit 16a (for example, between AMP11a and WSS12a) to the SN of the optical signal observed in the observation section of the optical signal observation unit 15 (for example, between AMP11a and WSS12a).

[0017] FIG. 2 is a configuration diagram of the signal quality converter 16a used in the optical transmission device 100A of FIG. The signal quality conversion unit 16a includes a quality measurement unit 161a, an SN measurement unit (ratio measurement unit) 162, an ASE (Amplified Spontaneous Emission) light source (noise output unit) 163, a blocking circuit 164, and gates Ga, Gb, and Gc. The gates Ga, Gb, and Gc are switched ON or OFF between a measurement mode in which measurement is performed and a normal mode in which measurement is not performed (details will be explained in the procedure below).

[0018] In the measurement mode, the quality measurement unit 161a measures the signal quality (BER) of the received measurement signal by transmitting and receiving the measurement signal so that the measurement signal passes through the TPND 14 of the transponder unit 120. The measurement signal is an optical signal (S signal) that becomes S (Signal) in the SN measured by the SN measurement unit 162. When an optical signal is used as the measurement signal, the quality measurement unit 161a can measure the signal quality (BER) of the converted electrical signal by O / E converting the received measurement signal. Furthermore, since the quality measurement unit 161a is connected to TPNDs 14a with various specifications, it is desirable that the quality measurement unit 161a be able to support various specifications (settings of modulation method, etc.).

[0019] The quality measurement unit 161a has a T terminal on the transmitting side (the T terminal is for transmitting only) and an R terminal on the receiving side (the R terminal is for receiving only), and has the function of a transponder. The quality measurement unit 161a outputs the S signal from the T terminal, and receives the S signal at the R terminal of the TPND 14a to be measured. The quality measurement unit 161a receives at its R terminal the S signal output from the T terminal of the TPND 14a and the N signal (details will be described later) output from the ASE light source 163, and evaluates the BER of the TPND 14a from the received content. Generally, it is measured so that the stronger the power of the N signal, the more the BER of the S signal decreases due to interference from that signal. The quality measurement unit 161a outputs the evaluated BER to the monitoring control unit 18.

[0020] The ASE light source 163 is a light source that amplifies and emits spontaneous emission light (ASE light). That is, the ASE light source 163 transmits the ASE light as a noise signal for the measurement signal so that it is added to the path of the measurement signal. The noise signal is a signal (N signal) that becomes N (Noise) in the SN measured by the SN measurement unit 162. The power of the N signal increases by increasing the intensity of the ASE light from the ASE light source 163. Even if the power of the S signal is constant, the signal quality of the S signal can be artificially deteriorated by increasing the power of the N signal. The blocking circuit 164 blocks only optical signals passing through the connected line in a specific direction. For example, the blocking circuit 164 in Figure 2 is indicated by an arrow "←", so it passes signals flowing from left to right in the drawing and blocks signals flowing in the opposite direction, from right to left.

[0021] The SN measuring unit 162 is a measuring instrument such as a spectrum analyzer, and measures the SN (ratio of the measurement signal to the noise signal) of the connected section (the section from the R terminal of the quality measuring unit 161a to the cutoff circuit 164), and outputs the result to the monitoring control unit 18. Therefore, the SN measuring unit 162 receives the S signal output by the quality measuring unit 161a and the N signal output by the ASE light source 163. The monitor control unit 18 receives the BER received from the quality measurement unit 161a and the SN received from the SN measurement unit 162, and calculates conversion data (SN / BER) that indicates the relationship between the two.

[0022] The processing of the signal quality conversion unit 16a in FIG. 2 will be specifically described below in terms of (Step 1) to (Step 6). (Step 1) When the monitoring control unit 18 confirms that the TPND 14a has been inserted, it transitions from normal mode to measurement mode. In measurement mode, the monitoring control unit 18 sets "gate Ga=ON (signal passing), gate Gb=OFF (signal blocking), gate Gc=OFF." As a result, an S signal flows from the T terminal of the TPND 14a → the quality measurement unit 161a → the R terminal of the TPND 14a, and communication between the TPND 14a and units other than the quality measurement unit 161a is blocked. (Step 2) In the measurement mode, the TPND 14a outputs an S signal, and the ASE light source 163 outputs an N signal with a certain power. In this state, the quality measurement unit 161a measures the BER, and the SN measurement unit 162 measures the SN. (Step 3) The monitoring control unit 18 receives the BER from the quality measurement unit 161a and the SN from the SN measurement unit 162, which were measured from the same signal (signal transmitted at the same time) in (Step 2), as the measurement results.

[0023] (Step 4) The ASE light source 163 gradually increases the N signal of (Step 2). Each time the signal increases, (Step 2) and (Step 3) are executed. (Step 5) (Step 4) is executed until the BER output from the quality measurement unit 161a falls below the BER limit, which is a characteristic that indicates the limit at which the S signal can be demodulated into an optical signal. (Step 6) When the monitoring control unit 18 confirms that the BER output from the quality measurement unit 161a has fallen below the BER limit, it switches back from the measurement mode to the normal mode. In the normal mode, the quality measurement unit 161a stops outputting the S signal, the ASE light source 163 also stops outputting the N signal, and the settings are "gate Ga=OFF, gate Gb=ON, gate Gc=ON." This enables communication between the TPND 14a and the multiplexer / demultiplexer 13a, so that the TPND 14a can communicate via the optical transmission device 100.

[0024] FIG. 3 is a diagram illustrating the hardware configuration of the optical transmission device 100A. The optical transmission device 100A and an optical transmission device 100B described later in FIG. 4 are configured as a computer 900 having a CPU 901, a RAM 902, a ROM 903, a HDD 904, a communication I / F 905, an input / output I / F 906, and a media I / F 907. The communication I / F 905 is connected to an external communication device 915. The input / output I / F 906 is connected to an input / output device 916. The media I / F 907 reads and writes data from a recording medium 917. Furthermore, the CPU 901 controls each unit by executing a program (also called an application, or an app for short) loaded into the RAM 902. This program can also be distributed via a communication line or recorded on a recording medium 917 such as a CD-ROM and distributed.

[0025] FIG. 4 is a configuration diagram of the optical transmission device 100B. The optical transmission device 100B in Fig. 4 is modified from the optical transmission device 100A in Fig. 1 in that one signal quality converter 16c measures multiple measurement targets (TPNDs 14a and 14b). Note that the optical transmission device 100A in Fig. 1 is configured such that one signal quality converter 16a measures one TPND 14a. As described above with reference to FIG. 4, the signal quality conversion unit 16 may be configured to output individual converted data for each of the multiple TPNDs 14.

[0026] FIG. 5 is a configuration diagram showing a first example of the signal quality converter 16c used in the optical transmission device 100B of FIG. Compared with the signal quality conversion unit 16a in FIG. 2, the signal quality conversion unit 16c in FIG. 5 has two additional measurement targets, and therefore has quality measurement units 161a and 161b for each measurement target. The first quality measurement unit 161a measures the TPND 14a as the first measurement target. A first gate set (gates Ga, Gb, Gc) and a first blocking circuit 164 are also provided along the path of the optical signal output by the first quality measurement unit 161a. The second quality measurement unit 161b measures the TPND 14b as a second measurement target. A second gate set (gates Ga, Gb, Gc) and a second blocking circuit 164 are also provided along the path of the optical signal output by the second quality measurement unit 161b.

[0027] 5, one quality measurement unit (such as the quality measurement unit 161a) is provided for each measurement target (such as the TPND 14a). That is, the signal quality conversion unit 16 includes, for each TPND 14, a quality measurement unit 161 configured so that the path of the measurement signal passing through each TPND 14 does not overlap with the path of the measurement signal passing through another TPND 14. On the other hand, the SN measurement unit 162 and the ASE light source 163 can be shared by multiple measurement targets, so the number of components in the optical transmission device 100 can be reduced.

[0028] FIG. 6 is a configuration diagram showing a second example of the signal quality converter 16c used in the optical transmission device 100B of FIG. 5 and 6 both measure two measurement objects, TPND14a and TPND14b. Meanwhile, in signal quality conversion unit 16c in Fig. 5, two quality measurement units 161a and 161b are provided for the two measurement objects, but in signal quality conversion unit 16c in Fig. 6, one quality measurement unit 161 is provided for the two measurement objects, and that quality measurement unit 161 measures each measurement object with a time difference. Although this increases the measurement time, it is possible to reduce the number of components (the number of DSPs) in the optical transmission device 100B.

[0029] Hereinafter, (Step 1) to (Step 8) of the ith measurement mode for measuring the ith measurement object (i=1, 2, . . . , n) will be specifically described with regard to the processing of the signal quality conversion unit 16c in FIG. (Step 1) After confirming that the TPNDs 14a and 14b for all measurement targets have been inserted, the monitoring control unit 18 starts the following process from i=1, where i≠j.

[0030] (Step 2) In preparation for the ith measurement mode, the monitoring control unit 18 sets the ith measurement target to "gate Gai=ON, gate Gbi=OFF, gate Gci=OFF" and the jth measurement target to "gate Gaj=OFF, gate Gbj=OFF, gate Gcj=OFF." For example, when i=1, the following are set: Gate Ga1=ON, Gate Gb1=OFF, Gate Gc1=OFF Gate Ga2=OFF, Gate Gb2=OFF, Gate Gc2=OFF As a result, the S signal output from the T terminal of the transponder that is the i-th measurement object is input from the R terminal of the quality measurement unit 161, and normal optical signals (optical signals other than the S signal) in the i-th measurement object are blocked. On the other hand, no S signal flows out to the j-th measurement object, and normal optical signals are also blocked.

[0031] (Step 3) The quality measurement unit 161 outputs an S signal as the i-th measurement mode, and the ASE light source 163 outputs an N signal with a certain power. In this state, the quality measurement unit 161 measures the BER, and the SN measurement unit 162 measures the SN. (Step 4) The monitoring control unit 18 receives the BER from the quality measurement unit 161 and the SN from the SN measurement unit 162, which were measured from the same signal (signal transmitted at the same time) in (Step 3), as the measurement results of the i-th measurement object. (Step 5) The ASE light source 163 gradually increases the N signal of (Step 3). Each time the signal increases, (Step 4) and (Step 5) are executed. (Step 6) (Step 5) is executed until the BER output from the quality measurement unit 161 falls below the BER limit.

[0032] (Step 7) When the monitoring control unit 18 confirms that the BER output from the quality measurement unit 161 has fallen below the BER limit, the quality measurement unit 161 stops outputting the S signal and ends the i-th measurement mode. Here, 1 is added to i (i = i + 1), and then if i > the number of measurement targets n, proceed to (Step 8), or if i ≦ the number of measurement targets n, return to (Step 2). (Step 8) The monitoring control unit 18 returns from the ith measurement mode to the normal mode. In the normal mode, the quality measurement unit 161 stops outputting the S signal, and the ASE light source 163 also stops outputting the N signal. Furthermore, the monitoring control unit 18 sets "gate Gak=OFF, gate Gbk=ON, gate Gck=ON" (k=1, 2, ..., n). This enables communication using normal optical signals at each measurement target.

[0033] As described above in Figure 6, the signal quality conversion unit 16 has one quality measurement unit 161 configured so that the path of the measurement signal passing through each TPND 14 partially overlaps with the path of the measurement signal passing through other TPNDs 14. During the time period when the measurement signal is routed through a predetermined TPND 14, the signal quality conversion unit 16 outputs converted data for the predetermined TPND 14 by blocking the path to other TPNDs 14.

[0034] [effect] The optical transmission devices 100A and 100B of the present invention are optical transmission devices 100 having a common unit 110 that transmits optical signals flowing through an optical fiber network, and a transponder unit 120 that transmits optical signals to be multiplexed / demultiplexed with respect to the optical signals flowing through the common unit 110, the common unit 110 has a signal quality conversion unit 16 that measures conversion data for converting the signal quality of the optical signal; The signal quality conversion unit 16 a quality measurement unit 161 that measures the signal quality of a received measurement signal by transmitting and receiving the measurement signal via the TPND 14 of the transponder unit 120; an ASE light source 163 that transmits a noise signal for the measurement signal so as to be added to the path of the measurement signal; an SN measurement unit 162 that calculates a ratio of the measurement signal to the noise signal from the received measurement signal and noise signal; The quality measuring unit 161 outputs conversion data indicating the relationship between the signal quality of the measurement signal measured by the quality measuring unit 161 and the ratio of the measurement signal to the noise signal measured by the SN measuring unit 162.

[0035] This allows the optical transmission devices 100A and 100B to acquire parameters that are independent of vendor specifications, such as conversion data, and therefore makes it possible to monitor the signal quality of optical signals flowing within the optical transmission devices even in an environment where different vendors are connected.

[0036] In the optical transmission devices 100A and 100B of the present invention, the optical transmission device 100 further includes an optical signal observation unit 15 and a monitoring control unit 18, The optical signal observing unit 15 observes the ratio of the data signal to the noise signal for the optical signal flowing through the common unit 110, The monitoring control unit 18 converts the ratio of the data signal to the noise signal observed by the optical signal observation unit 15 into the signal quality of the optical signal flowing through the common unit 110 in accordance with the conversion data output from the signal quality conversion unit 16.

[0037] This allows the optical transmission devices 100A and 100B to monitor the signal quality (BER) at the observation point of the common unit 110 without O / E conversion of the optical signal.

[0038] The optical transmission device 100B of the present invention is characterized in that the signal quality conversion unit 16 outputs conversion data for each of the multiple TPNDs 14 individually.

[0039] As a result, the optical transmission device 100B can reduce the number of electrical components by having one signal quality conversion unit 16 process multiple measurement targets.

[0040] The optical transmission device 100B of the present invention is characterized in that the signal quality conversion unit 16 is provided with a quality measurement unit 161 for each TPND 14, which is configured so that the path of the measurement signal passing through each TPND 14 does not overlap with the path of the measurement signal passing through other TPNDs 14.

[0041] This allows the optical transmission device 100B to simultaneously measure multiple measurement targets, thereby reducing the measurement time.

[0042] In the optical transmission device 100B of the present invention, the signal quality conversion unit 16 a quality measurement unit (161) configured so that a path of a measurement signal passing through each TPND (14) partially overlaps with paths of measurement signals passing through other TPNDs (14); During the time period when the measurement signal is routed through a predetermined TPND 14, the route to other TPNDs 14 is blocked, thereby outputting converted data for the predetermined TPND 14.

[0043] As a result, the optical transmission device 100B can reduce the number of electrical components by sharing part of the path of the measurement signal among multiple measurement targets. [Explanation of symbols]

[0044] 11a, 11b AMP 12a,12b WSS 13a,13b Multiplexer / demultiplexer 14a, 14b TPND (Transponder) 15 Optical signal observation section 16a,16b,16c Signal quality conversion section 18 Monitoring and control unit (control unit) 19a, 19b Optical fiber 100A, 100B Optical Transmission Equipment 110 Common area 120 Transponder section 161,161a,161b Quality measurement section 162 SN measurement section (ratio measurement section) 163 ASE light source (noise output section) 164 Breaking Circuit

Claims

1. An optical transmission device having a common unit that transmits an optical signal flowing through an optical fiber network, and a transponder unit that transmits an optical signal to be multiplexed / demultiplexed with respect to the optical signal flowing through the common unit, the common unit has a signal quality conversion unit that measures conversion data for converting the signal quality of the optical signal; The signal quality conversion unit a quality measurement unit that measures the signal quality of a received measurement signal by transmitting and receiving the measurement signal via a transponder of the transponder unit; a noise output unit that outputs a noise signal corresponding to the measurement signal so as to be added to a path of the measurement signal; a ratio measurement unit that calculates a ratio between the measurement signal and the noise signal from the received measurement signal and the noise signal, and outputting the converted data indicating the relationship between the signal quality of the measurement signal measured by the quality measurement unit and the ratio of the measurement signal to the noise signal measured by the ratio measurement unit. Optical transmission equipment.

2. the optical transmission device further includes an optical signal observation unit and a control unit; the optical signal observing unit observes a ratio of a data signal to a noise signal in the optical signal flowing through the common unit; The control unit converts the ratio of the data signal to the noise signal observed by the optical signal observation unit into the signal quality of the optical signal flowing through the common unit in accordance with the conversion data output from the signal quality conversion unit.

2. The optical transmission device according to claim 1.

3. The signal quality conversion unit outputs the conversion data individually for each of the plurality of transponders.

2. The optical transmission device according to claim 1.

4. The signal quality conversion unit is characterized in that the quality measurement unit is provided for each transponder so that the path of the measurement signal passing through each transponder does not overlap with the path of the measurement signal passing through another transponder.

4. The optical transmission device according to claim 3.

5. The signal quality conversion unit the quality measurement unit is configured so that a path of the measurement signal passing through each transponder partially overlaps with paths of the measurement signals passing through other transponders; During a time period when the measurement signal is routed through a predetermined transponder, the route to other transponders is blocked, thereby outputting the converted data for the predetermined transponder.

4. The optical transmission device according to claim 3.

6. A monitoring method for an optical transmission device having a common unit that transmits an optical signal flowing through an optical fiber network and a transponder unit that transmits an optical signal to be multiplexed / demultiplexed with respect to the optical signal flowing through the common unit, comprising: the common unit has a signal quality conversion unit that measures conversion data for converting the signal quality of the optical signal; The signal quality conversion unit measuring the signal quality of the received measurement signal by transmitting and receiving the measurement signal via the transponder of the transponder unit; transmitting a noise signal for the measurement signal so as to be added to a path of the measurement signal; calculating a ratio of the measurement signal to the noise signal from the received measurement signal and noise signal; and outputting the converted data indicating the relationship between the measured signal quality of the measurement signal and the ratio of the measured measurement signal to the noise signal. Monitoring method.

7. 6. A monitoring program for causing a computer to function as the optical transmission device according to claim 1.

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