JP5655701B2 - Optical fiber measuring method and optical fiber measuring device - Google Patents

Description

  The present invention relates to an optical fiber measurement method and an optical fiber measurement device for performing transmission characteristic inspection in an optical cable.

  Conventionally, transmission characteristics of optical fibers housed in optical cables have been inspected using an OTDR measuring instrument (Optical Time Domain Reflectmeter), but in the case of multi-fiber optical fibers, a measurement auxiliary device (MAS: Multiple Alignment System) Is used for efficient measurement.

  Specifically, in order to connect to the measurement dummy fiber, the ends of the plurality of tape cores that are the fibers to be measured are inserted into the plurality of V-grooves positioned and fixed in parallel on the MAS. To do. Next, the reverse end side of the dummy fiber connected to the OTDR measuring instrument is inserted into the movable head on the MAS. Next, the position of the movable head is controlled, and the dummy fibers are sequentially inserted into the appropriate V grooves in which the fibers to be measured are set. As a result, the end of the fiber to be measured and the end of the dummy fiber abut each other.

  Next, the operation of the OTDR measuring device is controlled by a personal computer installed with inspection software, and the quality of the transmission characteristics of each of the plurality of tape cores is automatically determined (see Patent Document 1). The inspection software performs pass / fail determination by controlling the operation of the OTDR measuring device and the MAS and analyzing the measurement data acquired from the OTDR measuring device.

JP 2006-90787 A

  However, in the optical fiber measurement method using the optical fiber measuring apparatus, when the dummy fiber set on the movable head is inserted into the V-groove, the dummy fiber is not inserted into an appropriate V-groove position, for example, adjacent to the V-groove. There is a case where it is erroneously inserted into the adjacent V groove. In this case, the V-groove connection with the regular fiber to be measured is not performed, resulting in an “axis misalignment” phenomenon that causes measurement leakage, and correct determination cannot be made.

For example, the generation pattern of the axis deviation will be described by taking a 4-core tape core wire measurement as an example.
The generation pattern A is a case where a dummy fiber is erroneously inserted in the V groove position outside the both ends of the tape. In this case, since the conventional inspection software automatically determines that the connection loss is abnormal, there is a possibility that the occurrence of the axis deviation can be detected.
However, the original detection object of the connection loss abnormality is for the detection of the fiber end face abnormality (chip, inclination), contamination of foreign matter, or mixing of different types of fibers, and no axial displacement phenomenon is assumed. Therefore, even if it is automatically determined that the connection loss is abnormal in the conventional system, it cannot be determined whether the axis is misaligned or another factor.

  The generation pattern B is a case where the dummy fiber is erroneously inserted into the V groove position inside the both ends of the tape. In this case, the same center is continuously measured. Therefore, since the butt connection with the fiber to be measured has been established, the conventional inspection software does not cause a connection loss abnormality and cannot detect any axial deviation.

The following 1 to 3 are assumed as main generation factors of the above-mentioned axis deviation.
The cause 1 is insufficient movement accuracy of the movable head due to aging of the MAS. In other words, this is due to a deviation from the center of the valley of the V groove and a decrease in accuracy of the moving pitch.
The generation factor 2 is due to a large amount of shake at the tip due to bending of the dummy fiber.
The generation factor 3 is due to incomplete setting of the dummy fiber on the movable head.

  An object of the present invention is to provide an optical fiber measuring method and an optical fiber measuring apparatus capable of reliably detecting an axial deviation phenomenon.

The above object is achieved by an optical fiber measuring method and an optical fiber measuring device having the following configurations according to the present invention.
(1) A plurality of fibers to be measured are inserted one by one into a plurality of V grooves of the V groove block, and the other end of the measurement optical fiber whose one end is connected to a measuring instrument is sequentially inserted into the V groove, A method of measuring an optical fiber that measures a specific transmission by matching with a fiber to be measured,
When the measurement result of the Nth heart is recognized as being equivalent to the measurement result of the N-1th heart, it is determined that the Nth eye and the N-1th heart need to be remeasured, and the measurement is performed again.

For example, if a dummy fiber is erroneously inserted inside either of the V-grooves in which both ends of the fiber to be measured are inserted, there is a possibility that the same core may be continuously measured. Nevertheless, the connection between the dummy fiber and the N core of the fiber to be measured has been established. For this reason, it is not determined that the connection loss is abnormal, and the measurement results of the Nth heart and the immediately preceding N-1th heart are unique patterns that are very likely to be identical or similar.
Therefore, according to the measurement method of the optical fiber having the above configuration, when the measurement result of the Nth heart is recognized as being equivalent to the measurement result of the N-1th heart, it is determined that the Nth eye and the N-1th heart need to be remeasured. Since the measurement is performed again, it is possible to reliably detect the axial displacement phenomenon in which the dummy fiber is erroneously inserted into the V groove position inside the both ends of the tape.

(2) The optical fiber measurement method according to (1) above, wherein the measurement device is an OTDR measurement device, and a difference in measurement values measured from the OTDR waveforms of the Nth heart and the N-1th heart is It is preferable to determine that it is equivalent when it is within a predetermined range and determine that remeasurement is necessary.

  According to the optical fiber measurement method having the above-described configuration, if the measured value difference between the Nth core and the N-1th core is within a predetermined range, it is determined that they are equivalent, so that the suspicious axis shift can also be reliably detected.

(3) In the optical fiber measurement method according to (2) above, it is preferable that the determination as to whether the re-measurement is necessary is made by determining that the measurement items measured from the waveform of the OTDR are equivalent.

  According to the optical fiber measurement method having the above-described configuration, by setting a plurality of measurement items such as a step amount and an abnormal value of inclination, it is possible to compare and collate with a reference value of each determination index set in advance. The occurrence can be automatically detected. Further, by setting as many appropriate determination indexes as possible, it is possible to improve the detection accuracy of the axis deviation and reduce the excess determination rate.

(4) The optical fiber measurement method according to (2) or (3) above, wherein a connection loss measurement result measured from the waveform of the OTDR is predetermined in the outermost V groove of the V groove block. If the value is equal to or greater than the value, it is preferable to determine that the heart needs to be remeasured and remeasure.

  According to the method for measuring an optical fiber having the above-described configuration, when a dummy fiber is erroneously inserted in the V-groove position outside the both ends of the tape, the dummy fiber and the fiber to be measured are not connected at all. In comparison, the peculiar pattern has an extremely high connection loss value. Therefore, by newly adding a reference value dedicated to detecting the axis deviation, if the measurement result is equal to or greater than the predetermined reference value, it is determined that the heart needs to be remeasured, and the axis deviation can be reliably detected. .

(5) An optical fiber measurement device that measures an optical fiber by the optical fiber measurement method according to any one of (1) to (4) above, and has a function of determining that the remeasurement is necessary. It is characterized by having.

According to the optical fiber measuring apparatus having the above configuration, when the measurement result of the Nth heart is recognized as being equivalent to the measurement result of the N-1th heart, it is determined that the Nth eye and the N-1th heart need to be remeasured and remeasured. Therefore, it is possible to reliably detect the axial displacement phenomenon in which the dummy fiber is erroneously inserted into the V groove position inside the both ends of the tape.
In addition, if the measurement result of the Nth center is equal to or greater than a predetermined reference value, it is determined that the heart needs to be remeasured by newly adding a reference value dedicated to detecting the axis shift, and the axis shift is reliably detected. Can do.

  According to the optical fiber measurement method and the optical fiber measurement device of the present invention, when the measurement result of the Nth core is recognized to be equivalent to the measurement result of the N-1th core, the Nth and N-1th cores need to be remeasured. Therefore, the axis deviation phenomenon can be reliably detected.

It is a block diagram which shows the structure of the optical fiber measuring device which concerns on this invention. It is an enlarged view which shows the principal part of MAS of FIG. It is the schematic which shows the connection edge part of the optical fiber on the V-groove block of MAS of FIG. FIG. 4 is an explanatory diagram of occurrence of an axis deviation in FIG. 3. It is the flowchart 1 which shows the measuring method of the optical fiber which concerns on this invention. It is a flowchart 2 which shows the measuring method of the optical fiber which concerns on this invention. It is a flowchart 3 which shows the measuring method of the optical fiber which concerns on this invention. It is a flowchart 4 which shows the measuring method of the optical fiber which concerns on this invention.

  Hereinafter, an embodiment of an optical fiber measurement method and an optical fiber measurement device according to the present invention will be described with reference to FIGS. In the present embodiment, a case where the fiber to be measured is a four-core ribbon is described as an example.

  As shown in FIG. 1, the optical fiber measurement apparatus 10 of the present embodiment mainly includes an OTDR measuring instrument 11 to which one end side of a dummy fiber F0 is connected, and a dummy fiber F0 and a measured fiber F1 on a V-groove block 14. And a control device 13 that controls the operation of the OTDR measuring instrument 11 and the MAS 12.

  The fibers to be measured F1 are arranged in parallel with four fiber core wires in contact with each other on a flat surface, and the outer periphery thereof is integrally covered with a tape core resin. One fiber core wire has a glass fiber including a core and a clad disposed at the center, and the outer periphery thereof is covered with a fiber resin including a colored layer.

  The OTDR measuring instrument 11 makes a light pulse incident on the fiber for measurement F1 and measures the return time and the amount of light of the backscattered light from each part, whereby the loss distribution and loss value (loss) on the fiber for measurement F1 are measured. Value), defect position, and the like. If there is a location where the loss is locally high in the fiber to be measured F1 itself, it appears as a change in inclination (step amount, section loss value) on the OTDR waveform, and such a change in inclination is regarded as a step abnormality or section loss abnormality. recognize.

  The control device 13 is installed with inspection software for transmission characteristic inspection, transmits a control signal 15 to the OTDR measuring instrument 11 to control the operation of the measuring instrument itself, and obtains measurement data acquired from the OTDR measuring instrument 11. 16 is received, and the measurement data 16 is analyzed to determine pass / fail. At the same time, a control signal 17 is transmitted to the MAS 12 to control the operation of the movable head 20 to be described later, and the dummy fiber F0 is connected to each measured fiber F1 positioned at the connection portion P on the V-groove block 14. Butt the other end.

  As shown in FIG. 2, the MAS 12 includes a movable head 20 that moves on the guide rail 22, a tape holder 23 that holds four fibers to be measured F <b> 1, and a fiber to be measured F <b> 1 for each tape holder 23. And a plurality of stages 24 to be arranged. In front of each stage 24, a V-groove block 14 having a plurality of V-grooves 30 (see FIG. 3) is provided. The stage 24 is inclined by a predetermined angle toward the V-groove block 14.

  The movable head 20 is set to be movable by a predetermined distance in the direction of the arrow 25 by the guide rail 22. This predetermined distance is a length corresponding to the pitch of adjacent V grooves 30 on the V groove block 14. On the movable head 20, a dummy holder 21 for holding the dummy fiber F0 is provided. The dummy holder 21 is set so as to be movable by a predetermined distance in the direction of an arrow 26 perpendicular to the moving direction 25 of the movable head 20 along the guide rail 22.

  As shown in FIG. 3, the V-groove 30 of the V-groove block 14 has the first groove portion 30 a, the second groove portion 30 b, the third groove portion 30 c, and the fourth groove portion by alternately forming the valley portions 31 and the mountain portions 32. Eight or twelve groove portions including the groove portion 30d are formed. The pitch X of the V-groove 30 is a glass fiber to be measured G1 exposed by peeling off a predetermined length of fiber resin including the colored layer of the fiber core F1 ′ to be measured that constitutes the four fibers to be measured F1. It corresponds to the interval between the adjacent glass fibers of .about.G4, for example, the interval W between the central axes of the first glass fiber G1 and the second glass fiber G2. Accordingly, the minimum moving distance of the movable head 20 in the direction of the arrow 25 is set to coincide with the pitch X of the V groove 30.

  Before the dummy fiber F0 is attached to the dummy holder 21, the fiber resin at the tip of the dummy fiber core wire F0 'is peeled off to expose the dummy glass fiber G0 having a predetermined length. The dummy fiber F0 is attached to a predetermined position of the dummy holder 21 on the movable head 20. Therefore, the movement distance of the dummy holder 21 in the direction of the arrow 26 is the distance Y between the tip of the dummy glass fiber G0 and the tip of the first glass fiber G1 disposed on the V-groove block 14, for example. Set to match.

The cause of the shaft misalignment will be described with reference to FIG.
The relationship between the glass diameter D0 (for example, 125 μm) of the dummy glass fiber G0 and the pitch X (for example, 250 μm) of the V groove 30 of the V groove block 14 that matches the minimum moving distance of the movable head 20 is X = A case of 2D0 will be described as an example.

  As shown in FIG. 4, the dummy glass fiber G0 is, for example, controlled in the second groove 30b in order to perform the next second core test measurement after the first core test measurement in the first groove 30a is completed. The In this case, the position of the dummy glass fiber G0 is controlled at the center of the valley 31 in the second groove 30b of the V-groove block 14 by the movable head 20 having a pitch of 250 μm.

  An allowable range for controlling the position in the second groove portion 30b is ± 125 μm before and after the center position of the valley portion 31. When this allowable range (± 125 μm) is exceeded, the dummy glass fiber G0 enters the first groove portion 30a or the third groove portion 30c, and an “axis deviation” occurs. For example, if the dummy glass fiber G0 is displaced by 125 μm or more to the left in the drawing, it is erroneously inserted into the first groove 30a. Further, when the dummy glass fiber G0 is displaced by 125 μm or more on the right side in the drawing, it is erroneously inserted into the third groove 30c.

Next, an optical fiber measurement method according to this embodiment will be described.
Automatic detection is possible by grasping the peculiar pattern at the time of occurrence of axis misalignment and incorporating judgment logic into the inspection software. Hereinafter, the determination logic to be incorporated will be described. In this embodiment, the case where the fiber to be measured is a four-core tape is described as an example, and is divided into three stages in the case of the first core, the second or third core, and the fourth core (final core). I will explain.

(First mind)
It is assumed that the dummy glass fiber G0 is erroneously inserted into the outer groove portion of the first groove portion 30a in which the first glass fiber G1 that is the opposite ends of the measurement fiber F1 is inserted (generation pattern A). In this case, since the dummy glass fiber G0 and the glass fiber of the connection partner are not connected at all, the peculiar pattern is that the connection loss value becomes extremely high compared to other cases.

  Based on the actual value of the connection loss abnormality due to foreign matter adhering to the fiber end face or the cutting state and the connection loss value in the unconnected state (about 31 dB), the determination reference value of “complete axis deviation” is set to 30 dB or more. Accordingly, by newly adding this determination reference value (30 dB or more) dedicated to detecting the axis deviation, the axis deviation can be reliably detected. Here, the complete axis deviation means that the possibility of axis deviation is approximately 100%. Further, depending on the OTDR measuring device used, the determination reference value may be 20 dB or more.

  As shown in FIG. 5, as a measurement procedure for the first center, first, a connection loss is measured in a temporary matching state, and a preliminary measurement process (step S1) for temporarily holding a connection loss value is performed.

  Next, the first connection loss determination (step S2) is performed based on the determination reference value (30 dB or more). When the connection loss value is 30 dB or more, “complete axis deviation” is displayed as the axis deviation handling process (step S3).

If the connection loss value is less than 30 dB, the second connection loss determination (step S4) is performed. If the connection loss value exceeds the upper limit of the reference value and is less than 30 dB, reconnection is performed as many times as the number of registered reconnections as the reconnection process (step S5). Is displayed. In addition, when reconnection is performed and the reference value is satisfied, the following normal measurement is performed.
When the connection loss value satisfies the reference value, the normal registration (step S6) acquires the total length loss, connection loss, section loss, abnormal point information, and terminal reflection amount, and stores the DB in the database (step S7). I do.

  Next, the process proceeds to the pre-measurement process for the second center.

(2nd heart, 3rd heart)
The dummy glass fiber G0 is erroneously inserted into the inner groove portion of either the first groove portion 30a or the fourth groove portion 30d in which the first glass fiber G1 or the fourth glass fiber G4, which is the both ends of the fiber F1 to be measured, is inserted. (Generation pattern B) is assumed. In this case, since there is a high possibility that the same core is continuously measured, the connection between the dummy glass fiber G0 and the glass fiber of the connection partner is established despite erroneous measurement.

  Therefore, it is not determined that the connection loss is abnormal, and erroneous insertion cannot be detected. In this pattern, since the same heart is continuously measured, the measurement results of the measuring heart (Nth heart) and the immediately preceding measuring heart (N-1th eye) are very likely to be identical or similar. It becomes a pattern. Therefore, for example, the following new determination index is provided.

Determination index 1: Abnormal point information 1 (step amount, step position)
Determination index 2: abnormal point information 2 (inclination abnormal value, inclination abnormal position)
Judgment index 3: Total length loss value Judgment index 4: Section loss value of several hundred meters on the end side Judgment index 5: End reflection amount (because the end of the fiber to be measured is in contact with air that differs greatly from the refractive index of the glass, Fresnel reflection Occurs)
Judgment index 6: Connection loss value between dummy fiber and fiber to be measured

In the above determination index example, the level difference (dB) is the fiber to be measured on the OTDR waveform with the backscattered light level (dB) on the vertical axis and the distance (km) on the horizontal axis. This is the amount of change (difference) in the backscattered light level between two points (start point, end point) in a specific section (step abnormal section) on the fiber.
The total length loss value (dB / km) is the change slope per km of the backscattered light level with respect to the total length of the measured fiber.
The section loss value (dB / km) is the change slope per km of the backscattered light level in a specific section (loss abnormal section) on the fiber to be measured.
The end reflection amount (dB) is the amount of change in the backscattered light level that rapidly increases at the end portion of the measured fiber.
The connection loss value (dB) is the amount of change in the backscattered light level generated at the start end portion of the fiber to be measured that is in contact with the dummy fiber.

  By providing the determination indexes 1 to 6, the difference between the measurement data corresponding to the determination indexes of the measurement heart (Nth heart) and the immediately preceding measurement heart (N-1th heart) is determined based on the criteria for each predetermined determination index. Axis deviation can be automatically detected by comparing and collating with the value. It should be noted that by setting as many appropriate determination indexes as possible, it is possible to improve the detection accuracy of axis deviation and reduce the excess determination rate.

  As shown in FIG. 6, the measurement procedure of the second heart and the third heart is a pre-measurement process (measurement of connection loss in a temporary matching state similarly to the first heart and temporarily holding a connection loss value) Step S11) is performed.

  Next, connection loss determination (step S12) is performed based on the connection loss reference value. When the connection loss value does not satisfy the reference value, as the reconnection process (step S13), reconnection is performed as many times as the number of registered reconnections, and when the connection loss value does not satisfy the reference value, “connection loss abnormality” is displayed. In addition, when reconnection is performed and the reference value is satisfied, the following normal measurement is performed.

  If the connection loss value satisfies the reference value, the normal registration (step S14) acquires the total length loss, connection loss, section loss, abnormal point information, and terminal reflection amount, and stores the DB in the database (step S15). )I do.

  Next, a comparison process (step S16) is performed in which the difference from the data of the immediately preceding heart (N-1 heart) is compared based on the criterion. The determination criterion at this time is, for example, a comparison process in the following priority order based on the determination indices 1 to 6 described above.

1st priority: Step amount and step position 2nd priority: Inclination abnormal value and center position of inclination abnormal section 3rd priority: Total length loss value 4th priority: Section loss on termination side Lm 5th priority: End reflection amount 6th priority : Connection loss value Note that the determination values of the first to sixth priority determination indexes can be set individually for each distance range in the table. The first priority and the second priority determine the abnormal value and the abnormal position as a set, respectively. As the fourth priority Lm, for example, 300 meters from the end is used. An example of a specific determination reference value table is shown in Table 1.

  Next, a determination process (step S17) is performed for determining whether the determination criterion is satisfied based on the comparison process. If any of the first and second priority or all of the third to sixth priority determination criteria is satisfied, a suspicious axis misalignment process (step S18) for displaying “suspicious axis misalignment” is performed. Note that the alleged misalignment here means that there is a high possibility of misalignment.

  Thereafter, a confirmation process (step S19) for confirming whether the measurement heart is the third heart is performed, and in the case of the second heart, the process proceeds to a pre-measurement process for the third heart, and a similar flow is executed.

(4th heart)
When the dummy glass fiber G0 is erroneously inserted into the outer or inner groove of the fourth groove 30d in which the fourth glass fiber G4, which is the final center of the fiber for measurement F1, is inserted (generation pattern A or generation pattern B) Is assumed. Note that the generation patterns A and B are described in the first to third minds, and thus the description thereof is omitted here.

  As shown in FIG. 7, the measurement procedure for the fourth heart, which is the final heart, is the same as the first to third cores, in which the connection loss is measured in a temporary matching state, and the connection loss value is temporarily held in advance. A measurement process (step S21) is performed.

  Next, the first connection loss determination (step S22) is performed based on the determination reference value (30 dB or more). When the connection loss value is 30 dB or more, “complete axis misalignment” is displayed as the axis misalignment handling process (step S23).

  When the connection loss value is less than 30 dB, the second connection loss determination (step S24) is performed. When the connection loss value exceeds the upper limit of the reference value and is less than 30 dB, reconnection is performed as many times as the number of registered reconnections as the reconnection process (step S25). Is displayed. In addition, when reconnection is performed and the reference value is satisfied, the following normal measurement is performed.

  When the connection loss value satisfies the reference value, the DB registration for acquiring the total length loss, connection loss, section loss, abnormal point information, and terminal reflection amount in normal measurement (step S26) and storing it in the database (step S27) I do.

  Next, a comparison process (step S28) is performed in which the difference from the data of the immediately preceding heart (N-1 heart) is compared based on the criterion. The determination criterion at this time is, for example, a comparison process in the priority order based on the determination indices 1 to 6.

  Next, a determination process (step S29) is performed for determining whether the determination criterion is satisfied based on the comparison process. If all the determination criteria are satisfied, a suspicious axis misalignment process (step S30) for displaying “suspicious axis misalignment” is performed.

  If the determination criterion is not satisfied, a confirmation process (step S31) is performed to confirm that the measurement center is the final center on the stage. If the determination center is not the final center, the first tape pre-measurement process of the next tape holder is performed. Migrate to

(Remeasurement confirmation process)
Next, as shown in FIG. 8, remeasurement confirmation processing (step S32) is performed based on the determination results of the first to fourth cores of each tape holder on the stage. In this basic processing step, the first step, the second step, and the third step are sequentially performed step by step.

<First step>
In the first step, the complete axis deviation is re-measured to be one of good, abnormal connection loss, and suspicious axis deviation. As shown in FIG. 8, this is a case where a complete axis deviation exists, and complete axis deviation confirmation and remeasurement processing (step S33) is performed. First, it is confirmed whether or not the dummy fiber F0 is broken. Here, the decentering refers to a state in which the glass portion of the dummy fiber F0 is completely broken under the influence of pressure measurement or bending.

  If the dummy fiber F0 is not decentered, it is determined that the complete axis is misaligned, and by pressing the complete axis misalignment button, the automatically operated measuring core is good, the connection loss is abnormal, and the suspected axis misalignment is changed to the complete axis misalignment. change. Thereafter, the whole heart is remeasured.

  If the dummy fiber F0 is broken, it is determined that it is not a complete axis misalignment, and the dummy breaker is displayed by pressing the dummy breaker button. Re-measure all hearts in automatic mode.

<Second step>
The second step re-measures connection loss anomalies and makes them all good. In the stage before re-measurement, comparison processing is performed on the display heart of the connection loss abnormality and its front and back centers, and if a suspicious axis shift newly occurs, it is re-measured collectively in the next third step.

  This is a case where there is no complete axis misalignment but there is a connection loss abnormality, and the connection loss abnormality remeasurement process (step S34) is performed.

The process proceeds according to the following procedure.
1) Remeasurement is performed in manual mode or automatic mode for the entire heart of the connection loss abnormality.
2) Make the whole heart a good heart by re-measurement.
3) A comparison process is performed on the display heart of the connection loss abnormality before re-measurement and its front and rear centers. Even if there is no axis misalignment during remeasurement work, all suspicious axis misalignment determination hearts are to be remeasured. If the center of the number is measured manually and no axis misalignment is found, shift to automatic measurement.
4) When a suspicious axis deviation occurs, follow the suspicious axis deviation processing rule of the third step.

<Third step>
In the third step, the suspicious axis deviation is re-measured, and if all becomes good, the re-measurement ends. This is a case where there is no complete axis deviation, but there is a suspicious axis deviation, and the suspicious axis deviation is confirmed and remeasured (step S35). When a suspicious axis deviation is newly generated in the second step, the number of suspicious axis deviations is visually confirmed in the manual remeasurement mode.

  If the axis misalignment cannot be confirmed, it is determined that the suspected axis misalignment is an erroneous determination, and the alleged axis misalignment button is pressed to change the whole heart where the suspected axis misalignment is displayed to a good heart, and no remeasurement is required. To.

  If the axis misalignment is confirmed, it is determined that all indications of the suspected axis misalignment are correct, and the button for determining whether the suspected axis misalignment is correct is pressed. Remeasure the entire center where the suspicious axis misalignment is displayed while visually confirming the V groove connection status in the manual remeasurement mode. In addition, when the axis deviation is completely eliminated by dummy adjustment or the like, the mode is switched to the automatic remeasurement mode.

  Finally, after completion of the measurement of the final remeasurement center, a remeasurement center confirmation process (step S36) is performed, and the inspection operation is completed. If an axis misalignment or a connection loss abnormality is confirmed by this confirmation process, a complete axis misalignment confirmation and remeasurement process (step S33), a connection loss abnormality remeasurement process (step S34), or a suspected axis misalignment confirmation and remeasurement are performed again. The measurement process (step S35) is fed back and remeasured.

  As described above, according to the optical fiber measurement method of this embodiment, a plurality of fibers to be measured F1 are inserted into the plurality of V grooves 30 of the V groove block 14 one by one, and one end side is connected to the OTDR measuring instrument 11. The other end of the dummy fiber F0 is inserted into the V-groove 30 in order, and is measured against the fiber to be measured F1 to measure the transmission specification. If it is recognized that the measurement result is equivalent, the N heart and the N-1 heart are determined to be re-measured and re-measured. As a result, it is possible to reliably detect the axial displacement phenomenon in which the dummy fiber F0 is erroneously inserted into the position of the V groove 30 inside the both ends of the tape.

  Further, according to the optical fiber measurement method of the present embodiment, the OTDR measurement device is equivalent when the difference between the measurement values measured from the OTDR waveforms of the Nth and N-1th cores is within a predetermined range. Recognize and judge that remeasurement is necessary. Thereby, a suspicious axis shift can also be detected reliably.

  Further, according to the optical fiber measurement method of the present embodiment, the determination as to whether re-measurement is necessary is performed by recognizing that a plurality of measurement items measured from the waveform of OTDR are equivalent. Thus, by setting a plurality of measurement items such as the step amount and the abnormal inclination value, it is possible to compare and collate with a reference value of each determination index set in advance, and it is possible to automatically detect the occurrence of the axis deviation. Further, by setting as many appropriate determination indexes as possible, it is possible to improve the detection accuracy of the axis deviation and reduce the excess determination rate.

  Further, according to the optical fiber measurement method of the present embodiment, when the connection loss measurement result measured from the OTDR waveform is equal to or greater than a predetermined value in the outermost V groove 30 of the V groove block 14, Re-measure the heart with the need to re-measure. As a result, when the dummy fiber F0 is erroneously inserted in the V-groove position outside the both ends of the tape, since the dummy fiber F0 and the fiber for measurement F1 are not connected at all, they are extremely connected compared to other cases. It becomes a peculiar pattern with a high loss value. Therefore, by newly adding a reference value dedicated to detecting the axis deviation, if the measurement result is equal to or greater than the predetermined reference value, it is determined that the heart needs to be remeasured, and the axis deviation can be reliably detected. .

  Further, according to the optical fiber measurement device of this embodiment, when the measurement result of the Nth heart is recognized as being equivalent to the measurement result of the N-1th heart, it is determined that the Nth heart and the N-1th heart need to be remeasured. Since the measurement is performed again, it is possible to reliably detect the axial displacement phenomenon in which the dummy fiber F0 is erroneously inserted into the V-groove position inside the both ends of the tape.

  The optical fiber measurement method and optical fiber measurement device of the present invention are not limited to the above-described embodiments, and can be appropriately modified and improved. In addition, the material, shape, dimension, numerical value, form, number, location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  DESCRIPTION OF SYMBOLS 10 ... Optical fiber measuring device, 11 ... OTDR measuring device, 12 ... MAS (measuring auxiliary device), 13 ... Control device, 14 ... V groove block, 20 ... Movable head, 21 ... Dummy holder, 22 ... Guide rail, 23 ... Tape Holder, 24 ... Stage, 30 ... V groove, 31 ... Valley, 32 ... Mountain, D0 ... Glass diameter, F0 ... Dummy fiber (measuring fiber), F1 ... Fiber to be measured, G0 ... Dummy glass fiber, G1 ... glass fiber to be measured, X ... V groove pitch

Claims (5)

A plurality of optical fibers for measurement are inserted one by one into a plurality of V grooves of the V groove block, and the other end of the measurement optical fiber whose one end is connected to a measuring instrument is sequentially inserted into the V groove, An optical fiber measuring method for measuring transmission specifics by matching with an optical fiber,
An optical fiber measurement method, characterized in that, when the measurement result of the Nth heart is recognized as being equivalent to the measurement result of the N-1th heart, it is determined that the Nth eye and the N-1th heart need to be remeasured, and the remeasurement is performed. The optical fiber measurement method according to claim 1,
The measuring device is an OTDR measuring device, and when the difference between the measured values measured from the OTDR waveforms of the Nth heart and the N-1th heart is within a predetermined range, it is determined that the measurement is equivalent and it is determined that remeasurement is necessary. An optical fiber measuring method characterized by the above. A method for measuring an optical fiber according to claim 2,
The determination as to whether the re-measurement is necessary is performed by determining that a plurality of measurement items measured from the waveform of the OTDR are equivalent to each other. A method for measuring an optical fiber according to claim 2 or 3,
In the outermost V-groove of the V-groove block, when the connection loss measurement result measured from the waveform of the OTDR is equal to or greater than a predetermined value, it is determined that the heart needs to be remeasured and remeasured. An optical fiber measuring method. An optical fiber measurement device for measuring an optical fiber by the optical fiber measurement method according to any one of claims 1 to 4,
An optical fiber measuring apparatus having a function of determining that the re-measurement is necessary.

Images