JP6891823B2 - Optical fiber side input / output device and optical fiber bending forming method - Google Patents

Description

The present disclosure relates to an optical fiber side input / output device that bends an optical fiber core wire and inputs / outputs light from the side of the optical fiber core wire, and a method of bending the optical fiber core wire.

A method described in Patent Document 1 has been proposed for monitoring optical fiber communication at a connection point of a line outside the station without entering an exchange. In this technology, the current optical fiber core wire is bent to the extent that it does not affect communication, and an optical signal is acquired by receiving leaked light. Further, as described in Non-Patent Document 1, in order to apply the present technology to the output portion of the 8-branch splitter outside the site, an optical fiber core wire covered with a transparent tube (hereinafter referred to as a tube core wire) is bent and leaked. Consideration is being made to acquire light.

Japanese Unexamined Patent Publication No. 2015-132775

Uematsu et al., "Side Optical Input / Output to Optical Fiber Core Wires Protected by Transparent Tubes", Institute of Electronics, Information and Communication Engineers Society Conference, B-13-20, September 2017

Various types of optical fiber core wires are laid at the connection points of the external lines, and even if limited to single core wires, outer diameter 0.25 mm single core wires, 0.5 mm single core wires, and even single core wires There is an optical fiber core wire having a structure covered with a tube having an outer diameter of 0.9 mm. In the conventional method, the bending shape and the position of the probe optical fiber are optimally designed according to the optical fiber core wire to be applied. Therefore, in order to support all single core wires, the operator has to specify each core wire. It was necessary to prepare an optical fiber side output device and replace it according to the type of core wire. That is, the conventional optical fiber side output device has a problem that the type of the work-symmetrical optical fiber core wire is determined and lacks versatility.

Therefore, an object of the present invention is to provide a highly versatile optical fiber side output device and an optical fiber bending forming method that can correspond to various types of optical fiber core wires in order to solve the above problems.

In order to achieve the above object, the optical fiber side output device according to the present invention is provided with a function of detecting that the bending formed in the optical fiber core wire is in a desired state, and the optical fiber core wire is provided with the function of detecting that the bending is in a desired state. It was decided to control so as not to give the above bending.

Specifically, the optical fiber side output device according to the present invention is
An optical input / output means that receives light that is incident on the optical fiber core wire that is bent in the longitudinal direction with respect to the optical fiber core wire and that leaks from the optical fiber core wire. The first jig to have and
A second jig that is curved in the longitudinal direction with respect to the optical fiber core wire and has a convex portion that sandwiches the optical fiber core wire with the concave portion of the first jig.
The concave portion of the first jig and the convex portion of the second jig are arranged so that the closest contact distance S (S> 0) between the concave portion of the first jig and the convex portion of the second jig becomes small. A pressing portion that applies a pressing force in the approaching direction to form a bend in the optical fiber core wire, and a pressing portion.
A detection unit that detects that the bending formed in the optical fiber core wire is in a desired state, and
When the detection unit detects that the bending of the optical fiber core wire is in a desired state, the detection unit stops reducing the closest contact distance S with respect to the pressing unit.
To be equipped.

In this optical fiber side output device, the detection unit monitors the bending state of the optical fiber core wire, and the pressing of the pressing unit is stopped when the desired bending is applied. Therefore, this optical fiber side output device can form the optimum bending regardless of the type of the optical fiber core wire. Therefore, the present invention can provide a highly versatile optical fiber side output device that can handle various types of optical fiber core wires.

For example, the detection unit has the following method.

As a first method, when the detection unit extracts information of a communication device that has transmitted the optical signal from an optical signal coupled to the optical input / output means from a bent portion of the optical fiber core wire, the optical fiber core It is characterized in that it is determined that the bending of the wire is in a desired state.

As a second method, the detection unit bends the optical fiber core wire when the optical signal light intensity coupled to the optical input / output means from the bent portion of the optical fiber core wire exceeds the threshold value P. It is characterized in that it is determined that a desired state has been reached.

As a third method, the detection unit is characterized in that when the closest contact distance S reaches the threshold value T, it is determined that the bending of the optical fiber core wire is in a desired state. In the case of the third method, it is preferable that one of a plurality of values is selected as the threshold value T, and a selection unit to be set in the detection unit is further provided.

Here, a communication device such as an ONU (Optical Network Unit) is not always connected to the optical fiber core wire, and the communication device is not always in operation. Even in such a case, it is preferable to equip the detection unit with the following functions in order to determine whether or not the communication device is connected to the optical fiber core wire.

The detection unit injects inspection light into the bent portion of the optical fiber core wire via the optical input / output means to propagate the optical fiber core wire, and the optical input / output from the bent portion of the optical fiber core wire. It is characterized in that it determines the presence or absence of reflected light of the inspection light coupled to the means. In this case, the optical input / output means receives the incident probe optical fiber that injects the inspection light into the bent portion of the optical fiber core wire and the light receiving probe light that receives the reflected light leaked from the bent portion of the optical fiber core wire. It may be a fiber.

When bending the optical fiber core wire with the optical fiber side input / output device, the loss given to the optical fiber can be reduced by combining the first method, the second method, and the third method. That is, the optical fiber bending forming method is
An optical input / output means that receives light that is incident on the optical fiber core wire that is bent in the longitudinal direction with respect to the optical fiber core wire and that leaks from the optical fiber core wire. The first jig to have and
A second jig that is curved in the longitudinal direction with respect to the optical fiber core wire and has a convex portion that sandwiches the optical fiber core wire with the concave portion of the first jig.
The concave portion of the first jig and the convex portion of the second jig are arranged so that the closest contact distance S (S> 0) between the concave portion of the first jig and the convex portion of the second jig is reduced. A pressing portion that applies a pressing force in the approaching direction to form a bend in the optical fiber core wire, and a pressing portion.
This is an optical fiber bending forming method for bending the optical fiber core wire with an optical fiber side input / output device including the above.
A pressing procedure in which the optical fiber core wire is sandwiched between the concave portion of the first jig and the convex portion of the second jig, and a pressing force is applied by the pressing portion so as to reduce the closest contact distance S.
During the pressing procedure, an information extraction confirmation procedure for confirming that information of a communication device that has transmitted the optical signal can be extracted from an optical signal coupled to the optical input / output means from a bent portion of the optical fiber core wire, and an information extraction confirmation procedure.
If the information of the communication device cannot be extracted by the information extraction confirmation procedure, it is confirmed that the light intensity of the optical signal coupled to the optical input / output means from the bent portion of the optical fiber core wire exceeds the threshold value P. Light intensity confirmation procedure and
When the light intensity of the optical signal does not exceed the threshold value P in the light intensity confirmation procedure, the proximity distance confirmation procedure for confirming that the closest distance S is equal to the threshold value T, and the proximity distance confirmation procedure.
When the information of the communication device can be extracted by the information extraction confirmation procedure, the light intensity of the optical signal exceeds the threshold value P by the light intensity confirmation procedure, or the closest contact by the proximity distance confirmation procedure. When the distance S is equal to the threshold value T, it is determined that the bending of the optical fiber core wire is in the desired state, and the pressing procedure is stopped.
When the closest distance S is larger than the threshold value T in the close distance confirmation procedure, a continuation procedure in which the pressing force is increased with respect to the pressing portion and the pressing procedure is repeated is performed.
It is characterized by performing.

Therefore, the present invention can provide a highly versatile optical fiber bending forming method that can correspond to various types of optical fiber core wires.

The present invention can provide a highly versatile optical fiber side output device and an optical fiber bending forming method that can correspond to various types of optical fiber core wires.

It is a figure explaining the optical fiber side input / output device which concerns on this invention. It is a figure explaining the optical fiber side input / output device which concerns on this invention. It is a figure explaining the optical fiber side input / output device which concerns on this invention. It is a flow figure explaining the optical fiber bending formation method which concerns on this invention. It is a figure explaining the adjustment mechanism of the closest contact distance S in the optical fiber side input / output device which concerns on this invention. It is a figure explaining the adjustment mechanism of the nearest contact distance S in the optical fiber side input / output device which concerns on this invention. It is a figure explaining the adjustment mechanism of the nearest contact distance S in the optical fiber side input / output device which concerns on this invention. It is a figure explaining the optical fiber side input / output device which concerns on this invention. It is a figure explaining the optical fiber side input / output device which concerns on this invention.

Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In addition, the components having the same reference numerals in the present specification and the drawings shall indicate the same components.

(Embodiment 1)
FIG. 1 is a diagram illustrating an optical fiber side input / output device 301 of the present embodiment. The optical fiber side input / output device 301 is
Optical input / output that receives light that is incident on the concave portion 22 that is curved in the longitudinal direction with respect to the optical fiber core wire 100 and the optical fiber core wire 100 that has been bent and leaks from the optical fiber core wire 100. The first jig 11 having the means 14 and
A second jig 12 having a convex portion 23 that is curved in the longitudinal direction with respect to the optical fiber core wire 100 and sandwiches the optical fiber core wire 100 with the concave portion 22 of the first jig 11.
The concave portion 22 of the first jig 11 and the convex portion of the second jig 12 so that the closest contact distance S (S> 0) between the concave portion 22 of the first jig 11 and the convex portion 23 of the second jig 12 becomes small. A pressing portion 13 that applies a pressing force in a direction in which the portion 23 approaches to form a bend in the optical fiber core wire 100,
A detection unit 15 for detecting that the bending formed on the optical fiber core wire 100 is in a desired state, and
When the detection unit 15 detects that the bending of the optical fiber core wire 100 is in a desired state, the stopping unit 16 stops reducing the closest contact distance S with respect to the pressing unit 13.
To be equipped.

In the present specification, as an example of the optical input / output means 14, a probe optical fiber 50 that inputs / outputs light to the optical fiber core wire 100 and a holding portion 51 included in the first jig 11 that holds the probe optical fiber 50 will be described. There is. As another example of the optical input / output means 14, a lens that collects leaked light may be used.
Further, the detection unit 15 has an optical reception unit 24 and an analysis unit 25.

When the detection unit 15 extracts information from the communication device that has transmitted the optical signal from the optical signal coupled to the optical input / output means 14 from the bending portion of the optical fiber core wire 100, the detection unit 15 desires to bend the optical fiber core wire 100. It is characterized in that it is judged that it has become.

A communication frame from a communication device such as an ONU propagates in the optical fiber core wire 100, and when the optical fiber core wire 100 is bent by the optical fiber side input / output device 301, the communication frame is bent from the bent portion. Leaks. The optical receiving unit 24 receives the leaked communication frame, and the analysis unit 25 receives the MAC (Media Access Control) address of the ONU or the like connected to the optical fiber core wire 100 from the communication frame and the information of the LLID (logical link identifier). Extract. The analysis unit 25 may have a display unit that displays the analysis result.

The pressing portion 13 increases the pressing pressure to press the second jig 12, and reduces the closest contact distance S. Then, the restraining unit 16 stops the increase in the pressing force applied to the second jig 12 to the pressing unit 13 at the same time that the analysis unit 25 can extract the above information. Therefore, the optical fiber side input / output device 301 maintains the state of the closest distance S at that time. After that, the restraining portion 16 may reduce the pressing force of the pressing portion 13 and release the bending of the optical fiber core wire 100.

In this way, the optical fiber side input / output device 301 has different outer diameters of the optical fiber core wire 100 in order to obtain the output efficiency required for the communication monitor and at the same time suppress the pressing force applied to the optical fiber core wire 100. Even if it is, the insertion loss can be reduced and the influence on the working communication can be suppressed.

(Embodiment 2)
FIG. 2 is a diagram illustrating the optical fiber side input / output device 302 of the present embodiment. The difference between the optical fiber side input / output device 302 and the optical fiber side input / output device 301 described in the first embodiment is that the detection unit 15 is coupled to the optical input / output means 14 from the bent portion of the optical fiber core wire 100. When the optical signal light intensity exceeds the threshold value P, it is determined that the bending of the optical fiber core wire 100 is in a desired state.

The optical receiving unit 24 receives the communication frame leaked from the optical fiber core wire 100, and notifies the stopping unit 16 at the same time when the light intensity becomes equal to or higher than the threshold value P. Here, the threshold value P is equal to or higher than the minimum light receiving sensitivity that can be received by the optical receiving unit 24. Then, when the restraining unit 16 receives the above notification from the light receiving unit 24, the restraining unit 16 stops the increase in the pressing force applied to the second jig 12 to the pressing unit 13. Therefore, the optical fiber side input / output device 302 maintains the state of the closest distance S at that time. After that, the restraining portion 16 may reduce the pressing force of the pressing portion 13 and release the bending of the optical fiber core wire 100.

When the optical fiber side input / output device 302 cannot analyze the information of the communication frame by the analysis unit 25 even though sufficient output efficiency is obtained as compared with the optical fiber side input / output device 301 of the first embodiment. However, the pressing force applied to the optical fiber core wire 100 can be suppressed. Therefore, the optical fiber side input / output device 302 can reduce the insertion loss even if the outer diameters of the optical fiber core wires 100 are different, and can further suppress the influence on the working communication.

As in the configuration of the optical fiber side input / output device 302 of FIG. 2, in the detection unit 15, the analysis unit 25 extracts the information of the communication frame and the optical reception unit 24 has the light intensity of the threshold value P or more. The restraining unit 16 may be controlled in combination with detecting the communication frame of the above.

(Embodiment 3)
FIG. 3 is a diagram illustrating the optical fiber side input / output device 303 of the present embodiment. The difference between the optical fiber side input / output device 303 and the optical fiber side input / output device 301 described in the first embodiment is that the detection unit 15 uses an optical fiber when the closest distance S reaches the threshold value T. It is determined that the bending of the core wire 100 is in a desired state.

The detection unit 15 of the present embodiment is a measuring device 26 that measures the closest distance S. The measuring instrument 26 notifies the stopping unit 16 when the closest distance S reaches the threshold value T. Here, the threshold value T is about the outer diameter of the optical fiber core wire 100. Then, when the restraining unit 16 receives the above notification from the measuring instrument 26, the restraining unit 16 stops the increase in the pressing force applied to the second jig 12 with respect to the pressing unit 13. Therefore, the optical fiber side input / output device 303 maintains the state of the closest distance S at that time. After that, the restraining portion 16 may reduce the pressing force of the pressing portion 13 and release the bending of the optical fiber core wire 100.

The output efficiency becomes lower than expected in the event of an abnormality such as when the optical fiber side input / output device fails to pinch the optical fiber core wire 100 or when some substance such as dust enters the path of the leaked light. There is. In such a case, the optical fiber side input / output device 303 can urge the operator to sandwich the optical fiber core wire 100. Therefore, the optical fiber side input / output device 303 prevents an increase in the pressing force on the optical fiber core wire 100 from being unable to be stopped and an insertion loss more than expected occurs in the event of an abnormality, and suppresses the influence on the working communication. can do.

Here, it is preferable to further include a selection unit in which one of the plurality of values is selected as the threshold value T and set in the measuring instrument 26. The threshold value T is T≈d, where d is the outer diameter of the optical fiber core wire 100. When the optical fiber core wire 100 has a structure covered with a tube, where t is the thickness of the tube, T≈d + 2t. For optical fiber core wires laid in actual equipment, the values of d and t (excluding tolerances) are often known in advance. Therefore, it is desirable that the threshold value T set in the measuring instrument 26 can be switched to any of n values T1, T2, ..., Tn. For example, if there are three types of optical fiber core wires having a structure in which a 0.25 mm single core wire, a 0.5 mm single core wire, and a 0.25 mm single core wire are covered with a tube of t = 0.2 mm, T1 = 0. .65 mm, T2 = 0.5 mm, T3 = 0.25. Before the work, the operator switches the threshold value T of the measuring instrument 26 of the optical fiber side input / output device 303 to T1, T2, or T3 according to the target optical fiber core wire 100.

As in the configuration of the optical fiber side input / output device 303 of FIG. 3, in the detection unit 15, the analysis unit 25 extracts the information of the communication frame, and the optical reception unit 24 has the light intensity of the threshold value P or higher. The restraining unit 16 may be controlled by combining the detection of the communication frame of the above and the fact that the measuring instrument 26 has the closest distance S equal to or higher than the threshold value T.

Specifically, it is controlled as shown in FIG. FIG. 4 is a flowchart illustrating a method of bending an optical fiber core wire using the optical fiber side input / output device 303 of FIG. That is, the method of FIG. 4 is an optical fiber bending forming method in which the optical fiber core wire 100 is bent by the optical fiber side input / output device 303.
A pressing procedure S01 in which the optical fiber core wire 100 is sandwiched between the concave portion 22 of the first jig 11 and the convex portion 23 of the second jig 12, and the pressing portion 13 applies a pressing force so as to reduce the closest contact distance S.
During the pressing procedure S01, the information extraction confirmation procedure S02 for confirming that the information of the communication device that transmitted the optical signal can be extracted from the optical signal coupled to the optical input / output means 14 from the bent portion of the optical fiber core wire 100, and the information extraction confirmation procedure S02.
If the information of the communication device cannot be extracted in the information extraction confirmation procedure S02, it is confirmed that the optical intensity of the optical signal coupled to the optical input / output means 14 from the bent portion of the optical fiber core wire 100 exceeds the threshold value P. Light intensity confirmation procedure S03 and
When the light intensity of the optical signal does not exceed the threshold value P in the light intensity confirmation procedure S03, the proximity distance confirmation procedure S04 for confirming that the closest distance S is equal to the threshold value T,
When the information of the communication device can be extracted in the information extraction confirmation procedure S02, when the light intensity of the optical signal exceeds the threshold value P in the light intensity confirmation procedure S03, or the closest distance in the close distance confirmation procedure. When S is equal to the threshold value T, it is determined that the bending of the optical fiber core wire 100 is in a desired state, and the pressing procedure S01 is stopped, and the stopping procedure S05 and
When the closest distance S is larger than the threshold value T in the close distance confirmation procedure S04, the pressing force is increased with respect to the pressing portion 13 and the continuation procedure S06 is repeated from the pressing procedure S01.
It is characterized by performing.

(Embodiment 4)
In this embodiment, the adjustment mechanism of the closest distance S between the first jig 11 and the second jig 12 will be described. FIG. 5 is a cut surface of the optical fiber core wire 100 on a plane perpendicular to the optical axis direction, which explains the adjustment mechanism.

The first jig 11 is fixed to the housing of the optical fiber side input / output device and is immovable. The second jig 12 is connected to the restraining portion 16 by a link rod 32. The link rod 32 has a branch 31, and a repulsive force R acts on the branch 31 and the first jig 11 in a direction in which they are separated from each other by a spring or a magnetic force. That is, when the restraining portion 16 is not controlled, the repulsive force R drives the second jig 12 toward the first jig 11 through the link rod 32, and the optical fiber core wire 100 is used as the pressing force with the first jig 11 and the first jig 11. 2 It can be crushed (formed by bending) with the jig 12. That is, the spring or magnetic force corresponds to the pressing portion 13. The repulsive force R of the restraining portion 16 can be adjusted by a brake or the like.

On the other hand, the restraining portion 16 can maintain the closest contact distance S by applying a force opposed to the repulsive force R to the link rod 32, and further makes the force larger than the repulsive force R to make the link rod 13 larger. Is returned and the second jig 12 is driven to the side away from the first jig 11 to release the optical fiber core wire 100 (release the bending).

6 and 7 are views for explaining the structure of the restraint portion 16. FIG. 6 shows a case where the restraining portion 16 is composed of a cam, and FIG. 7 shows a case where the restraining portion 16 is composed of an actuator. In the case of FIG. 6, the closest distance S can be adjusted by pulling up and pushing in the cam by the restraining portion 16. If the inclination of the cam is made gentle, the closest distance S can be finely controlled. In the case of FIG. 7, S is controlled by the actuator.

(Embodiment 5)
FIG. 8 is a diagram illustrating the optical fiber side input / output device 304 of the present embodiment. The optical fiber side input / output device 304 and the optical fiber side input / output device 301 of FIG. 1 have different configurations of the detection unit 15. The detection unit 15 of the optical fiber side input / output device 304 transmits the inspection light to the bent portion of the optical fiber core wire 100 via the optical input / output means 14 to propagate the optical fiber core wire 100, and causes the optical fiber core wire 100 to propagate. It is characterized in that the presence or absence of reflected light of the inspection light coupled to the optical input / output means 14 is determined from the bent portion of 100.

The detection unit 15 of the present embodiment includes an analysis unit 25, an optical transmission unit 27, an optical reception unit 28, and a photosynthetic demultiplexing unit 29. The optical transmission unit 27 incidents the inspection light on the optical fiber core wire 100 via the photosynthetic demultiplexing unit 29 and the probe fiber 50. The inspection light incident on the optical fiber core wire 100 propagates to the end portion, is not reflected when the ONU is connected, is reflected at the end portion when the ONU is not connected, and returns to the bent portion. The reflected light leaks from the bent portion and is received by the optical receiving unit 28 via the probe optical fiber 50 and the photosynthetic demultiplexing unit 29.

The optical fiber side input / output device 304 determines whether or not the ONU is connected based on the presence or absence of reflected light when the ONU is not connected or the power of the ONU is OFF and there is no signal light on the optical fiber core wire 100. It can be determined.

FIG. 9 is another example of the optical fiber side input / output device 304. The optical input / output means 14 of FIG. 9 is an incident probe optical fiber that injects inspection light into the bent portion of the optical fiber core wire 100 and a light receiving probe light that receives reflected light leaked from the bent portion of the optical fiber core wire 100. It is characterized by being a fiber. In the optical fiber side input / output device 304 of FIG. 8, the probe optical fiber 50 was one, but in the optical fiber side input / output device 304 of FIG. 9, the probe optical fiber 50 is two, and each is an optical transmission unit. It is for inspection light incident on the optical fiber core wire 50 from 27 and for reflected light that combines the reflected light leaking from the optical fiber core wire 50 to the light receiving unit 28.

(Effect of the invention)
The present invention realizes an optical fiber side input / output device capable of obtaining the output efficiency required for a monitor while reducing insertion loss and suppressing the influence on working communication even if the types of optical fiber core wires are different. it can.

11: 1st jig 12: 2nd jig 13: Pressing unit 14: Optical input / output means 15: Detection unit 16: Stopping unit 22: Concave curved surface 23: Convex curved surface 24: Optical receiving unit 25: Analytical unit 26: Measurement Instrument 27: Optical transmitter 28: Optical receiver 29: Optical duplexer 50: Probe optical fiber 51: Holding unit 100: Optical fiber core wire 301-304: Optical fiber side input / output device

Claims (6)

An optical input / output means that receives light that is incident on the optical fiber core wire that is bent in the longitudinal direction with respect to the optical fiber core wire and that leaks from the optical fiber core wire. The first jig to have and
A second jig that is curved in the longitudinal direction with respect to the optical fiber core wire and has a convex portion that sandwiches the optical fiber core wire with the concave portion of the first jig.
The concave portion of the first jig and the convex portion of the second jig are arranged so that the closest contact distance S (S> 0) between the concave portion of the first jig and the convex portion of the second jig becomes small. A pressing portion that applies a pressing force in the approaching direction to form a bend in the optical fiber core wire, and a pressing portion.
A detection unit that detects that the bending formed on the optical fiber core wire has reached a desired state when the closest distance S reaches the threshold value T.
When the detection unit detects that the bending of the optical fiber core wire is in a desired state, the detection unit stops reducing the closest contact distance S with respect to the pressing unit.
A selection unit that selects one of the values of the outer diameters of the plurality of optical fiber core wires as the threshold value T and sets it in the detection unit, and a selection unit.
Optical fiber side input / output device. An optical input / output means that receives light that is incident on the optical fiber core wire that is bent in the longitudinal direction with respect to the optical fiber core wire and that leaks from the optical fiber core wire. The first jig to have and
A second jig that is curved in the longitudinal direction with respect to the optical fiber core wire and has a convex portion that sandwiches the optical fiber core wire with the concave portion of the first jig.
The concave portion of the first jig and the convex portion of the second jig are arranged so that the closest contact distance S (S> 0) between the concave portion of the first jig and the convex portion of the second jig becomes small. A pressing portion that applies a pressing force in the approaching direction to form a bend in the optical fiber core wire, and a pressing portion.
A detection unit that detects that the bending formed in the optical fiber core wire is in a desired state, and
When the detection unit detects that the bending of the optical fiber core wire is in a desired state, the detection unit stops reducing the closest contact distance S with respect to the pressing unit.
Equipped with a,
The optical fiber core wire is sandwiched between the concave portion of the first jig and the convex portion of the second jig, and a pressing force is applied by the pressing portion so as to reduce the closest contact distance S.
The detection unit
While applying the pressing force at the pressing portion, it is confirmed whether or not the information of the communication device that transmitted the optical signal can be extracted from the optical signal coupled to the optical input / output means from the bent portion of the optical fiber core wire. If the information of the communication device cannot be extracted, it is confirmed whether or not the light intensity of the optical signal coupled to the optical input / output means from the bent portion of the optical fiber core wire exceeds the threshold value P, and the light When the light intensity of the signal does not exceed the threshold value P, a process for confirming whether or not the closest distance S is equal to the threshold value T is performed.
Bending of the optical fiber core wire when the information of the communication device can be extracted, when the optical intensity of the optical signal exceeds the threshold value P, or when the closest distance S is equal to the threshold value T. Is determined to be in the desired state, the application of the pressing force by the pressing portion is stopped, and when the closest contact distance S is larger than the threshold value T, the pressing force applied by the pressing portion is increased and the process is repeated. Fiber side input / output device. The detection unit
The inspection light is incident on the bent portion of the optical fiber core wire via the optical input / output means to propagate the optical fiber core wire, and the bent portion of the optical fiber core wire is coupled to the optical input / output means. The optical fiber side input / output device according to claim 1 or 2 , wherein the presence or absence of reflected light of the inspection light is determined. The optical input / output means are an incident probe optical fiber that injects inspection light into the bent portion of the optical fiber core wire and a light receiving probe optical fiber that receives reflected light leaked from the bent portion of the optical fiber core wire. The optical fiber side input / output device according to claim 3. An optical input / output means that receives light that is incident on the optical fiber core wire that is bent in the longitudinal direction with respect to the optical fiber core wire and that leaks from the optical fiber core wire. The first jig to have and
A second jig that is curved in the longitudinal direction with respect to the optical fiber core wire and has a convex portion that sandwiches the optical fiber core wire with the concave portion of the first jig.
The concave portion of the first jig and the convex portion of the second jig are arranged so that the closest contact distance S (S> 0) between the concave portion of the first jig and the convex portion of the second jig is reduced. A pressing portion that applies a pressing force in the approaching direction to form a bend in the optical fiber core wire, and a pressing portion.
This is an optical fiber bending forming method for bending the optical fiber core wire with an optical fiber side input / output device including the above.
A pressing procedure in which the optical fiber core wire is sandwiched between the concave portion of the first jig and the convex portion of the second jig, and a pressing force is applied by the pressing portion so as to reduce the closest contact distance S.
During the pressing procedure, an information extraction confirmation procedure for confirming that information of a communication device that has transmitted the optical signal can be extracted from an optical signal coupled to the optical input / output means from a bent portion of the optical fiber core wire, and an information extraction confirmation procedure.
If the information of the communication device cannot be extracted by the information extraction confirmation procedure, it is confirmed that the optical intensity of the optical signal coupled to the optical input / output means from the bent portion of the optical fiber core wire exceeds the threshold value P. Light intensity confirmation procedure and
When the light intensity of the optical signal does not exceed the threshold value P in the light intensity confirmation procedure, the proximity distance confirmation procedure for confirming that the closest distance S is equal to the threshold value T, and the proximity distance confirmation procedure.
When the information of the communication device can be extracted by the information extraction confirmation procedure, the light intensity of the optical signal exceeds the threshold value P by the light intensity confirmation procedure, or the closest contact by the proximity distance confirmation procedure. When the distance S is equal to the threshold value T, it is determined that the bending of the optical fiber core wire is in the desired state, and the pressing procedure is stopped.
When the closest distance S is larger than the threshold value T in the close distance confirmation procedure, a continuation procedure in which the pressing force is increased with respect to the pressing portion and the pressing procedure is repeated is performed.
An optical fiber bending forming method. Select one from the values of the outer diameters of the plurality of optical fiber core wires, and further perform the selection procedure set as the threshold value T used in the proximity distance confirmation procedure, the stop procedure, and the continuation procedure. The optical fiber bending forming method according to claim 5.

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