JPH08163033A - Method for testing optical line - Google Patents

Abstract

PURPOSE: To reduce the test time and cost by applying parallel operation to devices and parallel processing to a test of an optical pulse. CONSTITUTION: A CPU 7 executes continuously an operation command to a coated optical fiber selector 5 selecting optical fibers 3a-3d and a measurement condition setting command of an optical pulse test equipment 6 testing the selected optical fiber. In the case of continuous test for the plural optical fibers 3a-3d, after summing averaging processing of the optical fibers 3a-3d is finished, the CPU 7 commands the operation of the coated optical fiber selector 5 to select a succeeding optical fiber from among the optical fibers 3a-3d and after transfer of measurement data of the optical fiber from the test equipment 6 to the CPU 7 is finished, the CPU 7 commands the operation of setting of measurement condition of a succeeding optical fiber to the test equipment 6. After the CPU 7 commands the setting of the measurement condition of the succeeding optical fiber to the test equipment 6, the measurement data transferred from the test equipment 6 are analyzed and displayed except the time when the CPU 7 is operating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical line test method for performing an optical pulse test on an optical transmission line using an optical line test system including an optical coupler / splitter, a core selection device, an optical pulse test device and a CPU.

[0002]

2. Description of the Related Art Japanese Patent Application No.
A system as described in Japanese Patent No. 7906 (Japanese Patent Laid-Open No. 5-196543) is provided. The conventional optical pulse test method in this optical line test system is shown in FIGS.
And it demonstrates with reference to FIG.

FIG. 1 is a schematic diagram showing configurations of an optical transmission system and an optical line test system, and particularly shows a connection configuration of an optical pulse test apparatus. Reference numeral 1 is a transmission device inside a station, 1a is a light source unit, and 1b is a light receiving unit. Reference numeral 2 is an outside transmitter, 2a is a light receiving portion, and 2b is a light source portion. 3a, 3
b, 3c and 3d are optical fibers, 4 is an optical branching module, 5 is a core wire selecting device for selecting a test optical fiber, and the port A of the optical SW is the port of the optical SW under the control of the CPU (control processing unit). You can connect to s, t, u, v, w, x, y and z. 6 is an optical pulse tester (OTD
R), 7 are CPUs (control processing devices), 8 is a database, 9 is an optical filter, and 10 is an optical filter type reflector.

FIG. 6 is a block diagram showing a processing procedure of a conventional optical pulse test method. In the figure, in the optical SW operation, the optical fiber selecting device 5 selects a test optical fiber according to an instruction from the CPU 7, and a is a unit time of the processing. For OTDR measurement condition setting, in OTDR6,
The measurement condition of the test optical fiber (eg, the test wavelength, which is extracted in advance from the facility information of the optical fiber stored in the database 8 at the start of the optical pulse test according to the instruction from the CPU 7
(Distance range, pulse width, etc.) is set, and b is a unit time of the processing. Auto attenuator is OT
In the DR6, the backscattered light level of the test optical fiber is automatically attenuated according to an instruction from the CPU 7 so that the backscattered light level is automatically attenuated to set conditions suitable for measurement, and c is a unit time of the processing. Is.

Additive averaging is performed by CP in OTDR6.
Processing for reducing the noise component contained in the measurement data is performed by averaging the measurement data of any number of times set by the instruction from U7, and d is a unit time of the processing.
In the data transfer, in the OTDR 6, the measurement data that has been measured by the instruction from the CPU 7 is transferred to the CPU 7, and e is a unit time of the processing. In the waveform analysis result display, the CPU 7 automatically analyzes the measurement data transferred from the OTDR 6 and displays the result, and f is a unit time of the processing.

FIG. 7 is a flow chart showing an example of an optical SW operation and an OTDR measurement condition setting operation regarding the processing procedure of the conventional optical pulse test method. Next, an example of performing an optical pulse test by the conventional optical pulse test method will be described with reference to these drawings.

When the optical pulse test is performed on one core of the optical fiber 3a in FIG. 1, when the optical pulse test is started in step SA1 in FIG. 7, the CPU 7 refers to the database 8 to specify the designated test optical fiber (optical Fiber 3a)
The OTDR measurement condition information is extracted at the position where the core wire selection device is accommodated. In step SA2, the CPU 7 instructs the core wire selection device 5 to operate the optical SW.

In step SA3, the core selection device 5 selects the designated test optical fiber 3a, and the OTDR 6
Start connection with. In this case, the core wire selection device 5 uses the optical S
The port A of W is connected to the port s of optical SW to set the optical path. As a result, the optical pulse sent from the OTDR 6 is inserted into the test optical fiber 3 a via the port A, the port s, and the optical branching module 4 of the core selection device 5.

At step SA4, the CPU 7 confirms with the core wire selecting device 5 whether or not the operation of the optical SW is completed. If “Yes” in step SA4, the light S
When W determines that the operation is completed, the process proceeds to step SA5. In the case of “No” in step SA4, it is determined that the optical SW is operating, and the process returns to step SA4.

At step SA5, the CPU 7 confirms with the core wire selecting device 5 whether or not the operation of the optical SW has been normally completed as instructed by the CPU 7. In the case of "Yes" in step SA5, it is determined that the light SW is in the normally completed state, and the process proceeds to step SA6. In step SA5, "N
If it is "o", it is determined that the optical switch is in an abnormal end state, and step S
Return to A2.

At step SA6, the CPU 7 causes the OTDR
Instruct 6 to set the test wavelength. In step SA7, the OTDR 6 starts setting the test wavelength. In step SA8, the CPU 7 confirms with the OTDR 6 whether the test wavelength is the set instruction value. If "Yes" in step SA8, it is determined that the test wavelength is the set value, and the process proceeds to step SA9. If “No” in step SA8, it is determined that the test wavelength is out of the set value, and the process returns to step SA6.

At step SA9, the CPU 7 causes the OTDR
6 is instructed to set the averaging count. Step S
At A10, the OTDR 6 starts setting the number of times of averaging. In step SA11, the CPU 7 confirms with respect to the OTDR 6 whether or not the number of times of averaging is the set instruction value. If “Yes” in step SA11, it is determined that the number of times of averaging is a set value, and the process proceeds to step SA12.
If "No" in step SA11, it is determined that the number of times of averaging is out of the set value, and the process returns to step SA9.

At step SA12, the CPU 7 causes the OTD
Instruct R6 to set the distance range. Step SA
At 13, the OTDR 6 starts setting the distance range.
In step SA14, the CPU 7 confirms with the OTDR 6 whether or not the distance range is the set instruction value. If “Yes” in step SA14, it is determined that the distance range is the set value, and the process proceeds to step SA15. Step SA14
In the case of "No", it is determined that the distance range is out of the set value, and the process returns to step SA12.

At step SA15, the CPU 7 causes the OTD
Instruct R6 to set the pulse width. Step SA1
At 6, the OTDR 6 starts setting the pulse width. In step SA17, the CPU 7 confirms with respect to the OTDR 6 whether or not the pulse width is the set instruction value. Step SA1
If “Yes” in 7, the pulse width is determined to be the set value, and the process proceeds to step SA18. If "No" in step SA17, it is determined that the pulse width is out of the set value, and the process returns to step SA15.

At step SA18, the CPU 7 causes the OTD
Instructs R6 to operate the auto attenuator. The operation after step SA18 is as shown in FIG.
The OTDR 6 performs addition averaging processing after the auto attenuator operation ends, and performs data transfer processing to the CPU 7 after the addition averaging processing ends. The CPU 7 completes the optical pulse test by performing waveform analysis and result display after the data transfer process is completed. Here, the optical pulse test time per optical fiber is the sum (a + b + c +) of unit time of each processing.
It is represented by d + e + f).

Next, the optical fibers 3a and 3b in FIG.
A case of continuously performing optical pulse tests on three cores of 3 and 3c will be described. When the optical pulse test is started in step SA1 of FIG. 7, the CPU 7 refers to the database 8 and refers to the designated test optical fiber (optical fiber 3a, 3b).
And the core wire selection device accommodation position and OTDR measurement condition information of 3c) are extracted. In step SA2, CPU7
Instructs the core selection device 5 to operate the optical SW. In step SA3, the core selection device 5 selects the designated test optical fiber (optical fiber 3a), and the OTDR6
Start connection with.

In this case, the optical fiber selecting device 5 connects the port A of the optical SW to the port s of the optical SW to set the optical path. As a result, the optical pulse sent from the OTDR 6 is inserted into the test optical fiber 3 a via the port A, the port s, and the optical branching module 4 of the core selection device 5. Subsequent operations are the same as in the case of performing the optical pulse test on one core of the optical fiber 3a. The CPU 7 completes the optical pulse test of the test optical fiber 3a of the first core by performing the waveform analysis and the result display after the data transfer processing of the test optical fiber 3a of the first core is completed.

The CPU 7 is the test optical fiber 3a of the first core.
When the optical pulse test is completed, the optical pulse test of the second test optical fiber (optical fiber 3b) is started. When the optical pulse test of the second test optical fiber 3b is started in step SA1 of FIG. 7, C is set in step SA2.
The PU 7 instructs the core wire selection device 5 to operate the optical SW for the second test optical fiber 3b. Step SA
In 3, the core wire selection device 5 selects the designated second test optical fiber 3b and starts connection with the OTDR 6.

In this case, the core selection device 5 connects the port A of the optical SW to the port u of the optical SW to set the optical path. As a result, the optical pulse sent from the OTDR 6 is inserted into the test optical fiber 3b via the port A, the port u of the core selection device 5, and the optical branching module 4. Subsequent operations are the same as those in the optical pulse test of the optical fiber 3a of the first core described above. The CPU 7 completes the optical pulse test of the test optical fiber 3b of the second core by performing the waveform analysis and the result display after the data transfer processing of the test optical fiber 3b of the second core is completed.

The CPU 7 is the second test optical fiber 3b.
When the optical pulse test is completed, the optical pulse test of the third test optical fiber (optical fiber 3c) is started. When the optical pulse test of the third test optical fiber 3c is started in step SA1 of FIG. 7, C is set in step SA2.
The PU 7 instructs the core wire selection device 5 to operate the optical SW for the third test optical fiber 3c. Step SA
In 3, the optical fiber selection device 5 selects the designated test optical fiber 3c of the third optical fiber and starts the connection with the OTDR 6.

In this case, the core selection device 5 connects the port A of the optical SW to the port w of the optical SW to set the optical path. As a result, the optical pulse sent from the OTDR 6 is inserted into the test optical fiber 3c via the port A and port w of the optical fiber selecting device 5 and the optical branching module 4. Subsequent operations are the same as those in the optical pulse test of the optical fiber 3a of the first core described above. After the CPU 7 completes the data transfer process of the test optical fiber 3c of the third core and performs the waveform analysis and the result display, the optical pulse test of the test optical fiber 3c of the third core is completed, so that the three optical fibers 3a, 3b and 3c are processed.
End the optical pulse continuous test of the heart.

The optical pulse continuous test time is the optical pulse test time per optical fiber (a + b + c + d + e).
+ F) and the number of test optical fibers (n), and the optical pulse continuous test time in this case is 3 · (a + b + c + d
+ E + f).

[0023]

In the above-described conventional optical pulse test method, the CPU instructs another device (for example, the core wire selecting device) to operate, and if the device does not finish operating, another device. Since no operation instruction is given to (for example, the optical pulse test apparatus), while one apparatus is in the operating state, the other apparatus cannot operate.

The processing procedure of the optical pulse test is the optical SW.
Operation (unit time a), OTDR measurement condition setting (unit time b), auto attenuator (unit time c), averaging (unit time d), data transfer (unit time e), waveform analysis result display (unit time f) ) Are executed in this order, and the next process is not started unless one process is completed.
There is a problem that another process cannot be executed while one process is being executed. In addition, the test time per optical fiber is always (a + b + c + d + e + f), which is a necessary time, and it is impossible to shorten the test time.

When the optical pulse test is continuously performed on a plurality of optical fibers, the CPU does not start the optical pulse test of the next test optical fiber unless the optical pulse test of one test optical fiber is completed. Optical fiber 1
Relying on the test time per core and the number of test optical fibers makes it impossible to reduce the test time, and
There is a problem that the test time increases in direct proportion to the number of test optical fibers.

The present invention has been made in view of the above-mentioned circumstances, and in the optical line test method, in particular, when performing an optical pulse test and an optical pulse continuous test, by performing parallel operation of the devices and parallel processing of the test, It is an object of the present invention to provide an optical line test method that realizes efficient device operation control and test processing, and that can shorten test time and test cost.

[0027]

In order to solve the above-mentioned problems, the present invention provides a test target for fault isolation of an optical transmission system including an internal transmission device, an optical transmission line and an external transmission device. In the optical line test method of selecting the optical fiber of (1) and connecting it to the optical pulse test device and performing an optical pulse test for it, the switch operation instruction of the core selection device for selecting the test optical fiber and the The core selection device and the optical pulse test device operate in parallel by the CPU simultaneously instructing the measurement condition selection instruction of the optical pulse test device for performing the optical pulse test of the test optical fiber selected by the line selection device. It is characterized by comprising a procedure for

In the case where the optical pulse test is continuously performed on a plurality of optical fibers, the CPU further selects the switch of the optical fiber selection device so that the CPU selects the next test optical fiber after the averaging of the test optical fibers is completed. The procedure for starting the test of the next test optical fiber by giving an operation instruction, and the OTDR
After the transfer of the measurement data of the test optical fiber from the CPU to the CPU is completed, the CPU gives the OTDR an operation instruction for setting the measurement condition of the next test optical fiber, and the CPU
After instructing the DR to operate to set the measurement conditions for the next test optical fiber, analyze the measurement data of the test optical fiber transferred from the OTDR at times other than when the CPU is operating, and display the result. It is characterized by including.

[0029]

According to the present invention, a plurality of devices can be efficiently operated by simultaneously instructing the plurality of devices to operate, and
Since they can be operated in parallel, the operating time of the device can be shortened and the test time can be shortened. Further, even when the processing is already being executed, other processing can be executed in parallel and efficiently, so that the processing time can be shortened and the test time can be shortened. Furthermore, when performing an optical pulse test on a plurality of optical fibers continuously, the optical pulse continuous test time can be shortened by starting the optical pulse test of the next test optical fiber after the averaging of the test optical fibers is completed. Easy to implement.

[0030]

【Example】

(First Embodiment) FIG. 2 is a block diagram showing the processing procedure of the optical pulse test method according to the first embodiment of the present invention.
The parts corresponding to the respective parts in FIGS. 1, 6 and 7 are designated by the same reference numerals, and the description thereof will be omitted. In FIG.
Reference character α is an overlap time during which the optical SW operation (processing unit time a) and the OTDR measurement condition setting (processing unit time b) are executed in parallel, and the test time of the overlap time α is shortened. β is the unit time of the sum of data transfer (processing unit time e) and waveform analysis and result display (processing unit time f).

FIG. 3 is a flow chart showing an example of the optical SW operation and the OTDR measurement condition setting operation regarding the processing procedure of the optical pulse test method of this embodiment. Next, the operation of the first embodiment in which the optical pulse test is performed by the optical pulse test method of the present invention will be described with reference to FIGS. 1, 2 and 3.

When the optical pulse test is performed on one core of the optical fiber 3a in FIG. 1, when the optical pulse test is started in step SB1 in FIG. 3, the CPU 7 refers to the database 8 and refers to the designated test optical fiber (optical Fiber 3a)
The core wire selection device accommodation position and the OTDR measurement condition information are extracted. In step SB2, the CPU 7 instructs the core wire selection device 5 to operate the optical SW.

In step SB3, the core selection device 5 selects the designated test optical fiber 3a, and the OTDR 6
Start connection with. In this case, the core wire selection device 5 uses the optical S
The port A of W is connected to the port s of optical SW to set the optical path. As a result, the optical pulse sent from the OTDR 6 is inserted into the test optical fiber 3 a via the port A, the port s, and the optical branching module 4 of the core selection device 5.

At step SB4, the CPU 7 causes the OTDR
6 is instructed to set the measurement conditions. In step SB5, the OTDR 6 starts setting the test wavelength. In step SB6, the OTDR 6 starts setting the number of times of averaging. In step SB7, the OTDR 6 starts setting the distance range. In step SB8, the OTDR 6 starts setting the pulse width.

At step SB9, the CPU 7 confirms with the core wire selecting device 5 whether or not the operation of the optical SW is completed. If “Yes” in step SB9, the light S
When W determines that the operation is completed, the process proceeds to step SB10. In the case of “No” in step SB9, it is determined that the light SW is operating, and the process returns to step SB9.

In step SB10, the CPU 7 confirms with the core wire selecting device 5 whether or not the operation of the optical SW has been normally completed as instructed by the CPU 7. Step SB10
In the case of “Yes”, it is determined that the light SW is in the normally completed state, and the process proceeds to step SB12. In the case of “No” in step SB10, it is determined that the light SW is in the abnormal end state, and the process proceeds to step SB11. CPU in step SB11
Reference numeral 7 instructs the core wire selection device 5 to restart the optical SW.

At step SB12, the CPU 7 executes OTD.
Confirm with R6 whether the test wavelength is the set value. If “Yes” in step SB12, it is determined that the test wavelength is the set value, and the process proceeds to step SB13. If "No" in step SB12, it is determined that the test wavelength is out of the set value, and the process returns to step SB12.

At step SB13, the CPU 7 causes the OTD.
It is confirmed with respect to R6 whether or not the number of times of averaging is the set instruction value. If "Yes" in step SB13,
It is determined that the number of times of averaging is a set value, and the process proceeds to step SB14. If “No” in step SB13, it is determined that the number of times of averaging is out of the set value, and the process returns to step SB13.

At step SB14, the CPU 7 causes the OTD
It is confirmed with respect to R6 whether or not the distance range is the set instruction value. If “Yes” in step SB14, it is determined that the distance range is the set value, and the process proceeds to step SB15. If "No" in step SB14, it is determined that the distance range is out of the set value, and the process returns to step SB14.

In step SB15, the CPU 7 causes the OTD
It is confirmed with respect to R6 whether or not the pulse width is the set instruction value. If “Yes” in step SB15, it is determined that the pulse width is the set value, and the process proceeds to step SB16. If “No” in step SB15, it is determined that the pulse width is out of the set value, and the process returns to step SB15.

In step SB16, the CPU 7 causes the OTD
Instructs R6 to operate the auto attenuator. The operation after step SB16 is as shown in FIG.
The OTDR 6 performs addition averaging processing after the auto attenuator operation ends, and starts data transfer processing to the CPU 7 after the addition averaging processing ends. After the data transfer processing is completed, the CPU 7 completes the optical pulse test by performing waveform analysis and result display.

Here, the optical pulse test time per optical fiber is the sum (a + b + c + d + e) of unit time of each processing.
+ F), optical SW operation (processing unit time a) and OT
The DR measurement condition setting (processing unit time b) is represented by the difference in the overlapping time α executed in parallel, and the optical pulse test time in this case is (a + b + c + d + e + f) -α.

(Second Embodiment) Next, the operation of the second embodiment in which the optical pulse test is carried out on a plurality of optical fibers by the optical pulse test method of the present invention will be described with reference to FIGS. 1, 2 and 3. It will be described with reference to FIG. Optical fiber 3 in FIG.
When the optical pulse test is continuously performed on the three cores a, 3b, and 3c, when the optical pulse test is started in step SB1 of FIG. 3, the CPU 7 refers to the database 8 and specifies the designated test optical fiber (optical fiber 3a 3b and 3
The c-core selection device accommodation position and OTDR measurement condition information in c) are extracted. In step SB2, the CPU 7 instructs the core wire selection device 5 to operate the optical SW.

In step SB3, the core selection device 5 selects the designated test optical fiber (optical fiber 3a) and starts connection with the OTDR 6. In this case, the core selection device 5 connects the port A of the optical SW to the port s of the optical SW and sets the optical path. As a result, the optical pulse sent from the OTDR 6 is inserted into the test optical fiber 3 a via the core selection device 5, the port A, the port s, and the optical branching module 4. Subsequent processing operations are the same as those in the optical pulse test of the optical fiber 3a of the first embodiment.

In FIG. 2, the OTDR 6 performs the averaging process of the test optical fiber 3a of the first core after the auto-attenuator operation of the test optical fiber 3a of the first core is completed. After the averaging process of the first test optical fiber 3a is completed, CP
When the U7 instructs the optical fiber selector 5 to operate the optical SW of the second test optical fiber (optical fiber 3b), the optical pulse test of the second test optical fiber 3b is started. The OTDR 6 starts the measurement data transfer processing of the test optical fiber 3a of the first core to the CPU 7 after instructing the operation of the optical SW of the test optical fiber 3b of the second core.

In step SB3 of FIG. 3, the core wire selection device 5 selects the designated second test optical fiber (optical fiber 3b) and starts connection with the OTDR 6. In this case, the core selection device 5 connects the port A of the optical SW to the port u of the optical SW and sets the optical path. This allows
The optical pulse sent from the OTDR 6 is inserted into the test optical fiber 3b via the port A, the port u of the core selection device 5, and the optical branching module 4.

In FIG. 2, the CPU 7 executes the OTDR 6 after the data transfer processing of the test optical fiber 3a of the first core is completed.
Is instructed to set the OTDR measurement condition of the second test optical fiber 3b. The second test optical fiber 3b thereafter
The processing operation of is similar to that of the optical pulse test of the optical fiber 3a of the second embodiment. After instructing the OTDR measurement condition setting of the test optical fiber of the second core, and when the CPU 7 is not in operation (for example, operation instruction, operation confirmation, calculation, etc.), the CPU 7 operates the test optical fiber 3a of the first core. Analyze the measurement data and display the results. This gives 1
The optical pulse test of the test optical fiber 3a is completed.

In FIG. 2, the OTDR 6 is 2 after the operation of the attenuator of the second test optical fiber 3b is completed.
The arithmetic averaging process of the test optical fiber 3b is performed. Two
After the averaging process of the test optical fiber 3b of the center eye,
The CPU 7 instructs the optical fiber selection device 5 to operate the optical SW of the test optical fiber of the third core (optical fiber 3c) to start the optical pulse test of the test optical fiber 3c of the third core. OTDR6 is the third test optical fiber 3
After instructing the operation of the optical SW of c, the CPU 7 starts the measurement data transfer process of the second test optical fiber 3b.

In step SB3 of FIG. 3, the fiber selection device 5 selects the designated test optical fiber 3c) of the third fiber and starts connection with the OTDR 6. in this case,
The core wire selection device 5 sets the port A of the optical SW to the port w of the optical SW.
Connect to and set the optical path. As a result, the optical pulse transmitted from the OTDR 6 passes through the test optical fiber 3c via the port A and port w of the core selection device 5 and the optical branching module 4.
Is inserted into.

In FIG. 2, the CPU 7 instructs the OTDR 6 to set the OTDR measurement condition of the third test optical fiber 3c after the data transfer process of the second test optical fiber 3b is completed. The subsequent processing operation of the third test optical fiber 3c is the same as the optical pulse test of the optical fiber 3b of the second embodiment. The CPU 7 sends the measurement data of the second test optical fiber 3b after the OTDR measurement condition setting instruction of the third test optical fiber and at a time other than when the CPU 7 is in operation (for example, operation instruction, operation confirmation, calculation, etc.). Parse and display the results. This completes the optical pulse test of the second test optical fiber 3b.

In FIG. 2, the OTDR 6 is 3 after the auto-attenuator operation of the third test optical fiber 3c is completed.
The averaging processing of the test optical fiber 3c is performed. Three
After the addition and averaging process of the test optical fiber 3c
The OTDR 6 starts the data transfer processing of the measurement data of the third test optical fiber 3c to the CPU 7. CPU
7 finishes the optical pulse test of the test optical fiber 3c of the third core by performing waveform analysis and result display after the data transfer processing is completed, whereby the continuous optical pulse test of the three fibers of the optical fibers 3a, 3b, and 3c is performed. To finish.

Here, the optical pulse continuous test time is the optical pulse test time per optical fiber ((a + b + c + d +
e + f), optical SW operation (processing unit time a) and O
From the product of the TDR measurement condition setting (processing unit time b) and the difference between the overlapping time α in parallel) and the number of test optical fiber cores (n), data transfer (processing unit time e) and waveform It is expressed by the difference obtained by subtracting the sum of unit time β of the sum of analysis and result display (unit time f of processing), and the optical pulse continuous test time in this case is 3 · (a + b + c + d + e +
f)-(3α + 2β). Here, since the unit time e of data transfer is much smaller than that of the optical switch operation a, the overlap time during which the optical SW operation and the OTDR measurement condition setting are executed in parallel is equal to α even in the second and subsequent cores. .

FIG. 4 shows the test time when the optical pulse test is performed on one optical fiber in the first embodiment (FIG. 4B) and the test time when the conventional technique is used (FIG. It is the figure which showed the comparison with (a). In FIG. 7B, the optical pulse test time per optical fiber according to the present invention is (a + b + c + d + e + f) -α, and the conventional optical pulse test time (a + b + c +) in FIG.
d + e + f), optical SW operation (processing unit time a) and OTDR measurement condition setting (processing unit time b)
The overlap time α in which is executed in parallel is shortened.

FIG. 5 shows the test time when the optical pulse continuous test is performed on the three optical fibers in the second embodiment (FIG. 5B) and the test time when the conventional technique is used. It is the figure which showed the comparison with (the same figure (a)). In the same figure (b), the optical pulse continuous test time of the three optical fibers according to the present invention is 3 · (a + b + c + d + e + f) −γ, which is compared to the conventional optical pulse continuous test time 3 · (a + b + c + d + e + f) in the same figure (a). Γ has been shortened. Here, γ is the optical SW operation (processing unit time a)
And the sum 3α of the overlapping time α in which the OTDR measurement condition setting (processing unit time b) is executed in parallel, the data transfer (processing unit time e), the waveform analysis and the result display (processing unit time f). The sum of the unit time β of the sum and the sum 2β is represented by γ = 3α + 2β.

[0055]

As described above, according to the present invention, a plurality of devices can be efficiently operated in parallel by instructing the plurality of devices to operate at the same time. The operation time is shortened and the test time is shortened. Further, even while the processing is already being executed, other processing can be executed in parallel and efficiently, so that the processing time can be shortened and the test time can be shortened. Further, in the case of performing the optical pulse test continuously on a plurality of optical fibers, by starting the optical pulse test of the next test optical fiber after the averaging of the test optical fibers is finished, the optical pulse continuous test time can be significantly reduced. The advantage is that the reduction can be easily realized and the test cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing configurations of an optical transmission system and an optical line test system.

FIG. 2 is a block diagram showing a processing procedure of an optical pulse test method according to the first and second embodiments of the present invention.

FIG. 3 of the first and second embodiments of the invention, in particular the light S
9 is a flowchart showing an example of a W operation and an OTDR measurement condition setting operation.

FIG. 4 is an explanatory diagram showing an evaluation result in the first embodiment of the present invention.

FIG. 5 is an explanatory diagram showing an evaluation result in the second embodiment of the present invention.

FIG. 6 is a block diagram showing a processing procedure of a conventional optical pulse test method.

FIG. 7 is a flowchart showing a processing procedure of a conventional optical pulse test method.
Particularly, it is a flowchart showing an example of the optical SW operation and the operation of setting the OTDR measurement condition.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intra-station transmission device 1a Light source part 1b Light receiving part 2 Outer station transmission device 2a Light receiving part 2b Light source parts 3a, 3b, 3c, 3d Optical fiber 4 Optical branching module 5 Core selection device 6 Optical pulse test device (OTDR) 7 CPU (Control processing device) 8 Database 9 Optical filter 10 Optical filter type reflector

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Isao Nakanishi 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (2)

[Claims] 1. An optical transmission system comprising an internal transmission device, an optical transmission line and an external transmission device, wherein an optical fiber to be tested is selected and connected to an optical pulse test device to which an optical pulse is applied. In an optical line test method for performing a test, a switch operation instruction of a core selection device for selecting a test optical fiber and an optical pulse test device for performing an optical pulse test of a test optical fiber selected by the core selection device. An optical line test method comprising: a CPU (control processing device) simultaneously instructing the measurement condition setting instruction of 1. to operate the core selection device and the optical pulse test device in parallel. 2. The optical line test method according to claim 1, wherein the optical line test is continuously performed on a plurality of optical fibers, and further, after the averaging process of the test optical fibers is completed, the CP
A procedure for starting the test of the next test optical fiber by U instructing the switch operation of the core selection device for selecting the next test optical fiber, and the procedure of the test optical fiber from the optical pulse test device to the CPU. After the transfer of the measurement data is completed, the CPU gives the optical pulse test apparatus an operation instruction for setting the measurement condition of the next test optical fiber, and the CPU gives the optical pulse test apparatus the next test. After instructing the operation of setting the measurement conditions of the optical fiber,
A procedure for analyzing the measurement data of the test optical fiber transferred from the optical pulse test apparatus at a time other than during the operation of U and displaying the result thereof.