JP2003232701A - Light receiver for lighting cable core and method for using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiver which prevents communication quality in an L band from deteriorating when illuminating a cable core. <P>SOLUTION: A light receiver 4 comprises a clamping recess 10, a clamping projection 15 consisting of a projection 15a and a side recess L15b and a side recess R15c at both the wings, and an attachment member L30 and an attachment member R35 for pressing and clamping an optical fiber cable core along with the clamping recess 10 and the clamping projection between the clamping recess 1 and the clamping projection 15. The light receiver 4 adjusts the position of the attachment member L30 and the attachment member R3, and changes the shape of curvature given to the optical fiber cable core, thus changing intensity in communication light and intensity in illumination light to be radiated to the outside of the optical fiber cable core, and specifying an optical fiber cable core 1 and upper and lower portions. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an optical fiber identification system for identifying an optical fiber in order to avoid erroneous disconnection and connection of the optical fiber in the construction and maintenance of an optical fiber communication network. The present invention relates to an optical signal receiving device for optical fiber comparison and a method of using the device.

[0002]

2. Description of the Related Art In constructing and maintaining an optical fiber communication network, in order to prevent accidental disconnection and connection of optical fiber cores, the optical fiber cores in optical fiber cables or customers It is necessary to individually identify the optical fiber of the home. This work is called a core wire control and is usually performed by the method shown in FIG.

That is, in FIG. 1, an optical signal light source device (hereinafter referred to as a "light source device") 2 for optical fiber comparison installed on the upper side (left side in FIG. 1) of an optical fiber optical fiber 1 requiring a contrast.
Then, the optical signal for optical fiber reference (hereinafter, referred to as “reference light”) is incident on the optical fiber optical fiber 1 via the optical signal input device for optical fiber comparison (hereinafter referred to as “injection device”) 3. On the lower side of the optical fiber core wire 1 (on the right side in FIG. 1), the optical fiber core wire 1 is bent by using an optical signal receiving device (hereinafter referred to as “light receiving device”) 4 for optical fiber comparison, so that the reference light Is emitted to the outside of the optical fiber core wire 1 to detect the reference light.

Here, the light source device 2 is a laser diode (having a wavelength longer than that of a communication optical signal (hereinafter referred to as "communication light") propagating through the optical fiber core wire 1 for providing information and the like to a customer's house. This is a device that emits light such as light from an LD) or a light emitting diode (LED) that is frequency-modulated at 270 Hz. For example, when the wavelength of the communication light is 1.31 μm, the wavelength of the reference light is 1.55 μm, and when the wavelength of the communication light is 1.55 μm, the wavelength of the reference light is 1.65 μm.
Is adopted.

As the incident device 3, an optical fiber coupler, a waveguide type directional coupler, or the like is used, or the reference light is directly incident from the upper end face of the optical fiber core wire 1.

The light receiving device 4 is provided with a bending mechanism for efficiently emitting only the reference light to the outside of the optical fiber core wire 1 while suppressing the loss of the communication light to a predetermined level. An optical signal light receiving element (hereinafter referred to as “light receiving element”) for core wire comparison, such as a Ge photodiode or an InGaAs photodiode for receiving the emitted light, is provided, and the presence or absence of the reference light and intensity measurement are performed. be able to.

With such a configuration, even when the communication light is being transmitted / received, the operator on the lower side detects the reference light incident from the upper side of the optical fiber core wire 1 by using the light receiving device 4, The core control is performed.

The light source device 2, which has been used conventionally,
A typical example of the core wire comparison system including the incident device 3 and the light receiving device 4 is shown in the following document, for example. Reference: "Enomoto et al .:" Design of compact optical fiber ID tester using hybrid optical module ", 1996.
Proceedings of IEICE Communications Society Conference (Volume 2: Communication 2), Lecture No. B-976, P. 461 "

FIG. 2 shows a light receiving device 4 which has been conventionally used.
2 shows a curved shape given to the optical fiber core wire 1. As can be seen from the shape of the curved portion 4a in FIG. 2, the curved shape is conventionally bilaterally symmetric, and therefore, the upper side (left side in FIG. 2) and the lower side (right side in FIG. 2) of the optical fiber core wire 1 are formed. No matter which side the control light is incident on, the core line can be controlled, and the same measurement value can be obtained in the intensity measurement of the control light, so that the work is simplified.

[0010]

As described above, in the conventional optical fiber contrasting system, the light receiving device 4 is used to give the optical fiber optical fiber 1 a bilaterally symmetrical curve so that the reference light can be emitted outside the optical fiber optical fiber 1. By radiating the light and detecting it by the light receiving element, the core wire can be checked. At this time, although there is no influence on services such as information provision, communication light also suffers loss due to the bending of the optical fiber core wire 1.

Therefore, in the conventional light receiving device 4, not only is the optical fiber core wire 1 not damaged or broken even if the optical fiber core wire 1 is held, but also the reference light is detected so that the reference light can be reliably detected. Can be radiated to the outside of the optical fiber core wire 1, and
In order to suppress the loss of communication light to a certain predetermined level, the radius of curvature for pressing and holding the optical fiber core wire 1 is selected.

However, in addition to 1.31 μm and 1.55 μm which have been conventionally used as communication light in recent years, L
Band (1.565 μm to 1.625 μm: ITU-T
Recommendation) Wavelengths in the band are being used. It goes without saying that the loss caused by bending the optical fiber core wire 1 becomes larger as the wavelength becomes longer, but the conventional light receiving device 4 suppresses the loss for the L-band communication light. Since it is not designed to do so, there is a possibility that a large loss occurs in the L-band communication light during transmission and reception during the core wire comparison work, and the communication quality deteriorates.

In principle, if the loss of the L-band communication light is suppressed, in principle, the radius of curvature of the curvature given to the optical fiber core wire 1 may be increased, but on the contrary, the radiation amount of the reference light is increased. The number of the optical fibers decreases, and the reference light cannot be detected with certainty, and thus the optical fiber cannot be compared, which is a great obstacle to the construction and maintenance of the optical fiber communication network.

Further, in the star network, which has been the mainstream in the dawn of optical service demand where the amount of installed optical fiber cables is small so far, it is possible to visually identify the upper and lower parts of the optical line, and it has been conventionally used. Light receiving device 4
The curved shape of Fig. 2 was symmetrical and the effect was exhibited.

However, in the loop network which is one of the wiring forms for the optical service demand which is increasing in the future,
It is not possible to identify the upper and lower portions of each of the optical fiber core wires 1 of this one, not only by visual inspection but also by using the conventional light receiving device 4.

This is because the upper and lower portions of the optical line are related to the traveling direction of the reference light, so that in the loop network, even if the reference light is incident on the upper side of the optical fiber core wire 1, the reference light is transmitted from the lower side. This is because it may reach the light receiving device 4. In other words, in the case of the loop network, the conventional light receiving device 4 also detects the reference light from the lower side because the curved shape is bilaterally symmetrical.

Therefore, when the conventional light receiving device 4 is used,
In the loop network, it is only possible to identify the corresponding optical fiber core wire 1, and it is not possible to identify the upper and lower parts of the optical line for determining the cutting position of the optical fiber core wire 1 in detail. There is a possibility that the optical fiber core wire 1 may be cut at the position.

The present invention has been made in view of the above-mentioned circumstances, and one of its objects is to efficiently transmit an optical signal while suppressing the loss of the communication light even in an environment where the L band is used as the communication light. The purpose of the present invention is to provide a means capable of specifying the fiber core wire.

Another object of the present invention is to provide a means capable of reliably determining the upper part and the lower part of an optical line.

[0020]

The first object can be achieved by changing the intensity of communication light or the intensity of reference light emitted outside the optical fiber core in the light receiving device. These light intensities can be changed, for example, by changing the shape of the curve given to the optical fiber core wire. The second object can be achieved by making the shape of the curve given to the optical fiber core wire asymmetric in the light receiving device. The matters for specifying the invention will be shown below.

The first invention is a light-receiving device, which is used in a system for performing optical fiber comparison in order to avoid erroneous disconnection and misconnection of optical fiber cores in the construction and maintenance of optical fiber communication networks. By giving a curvature to the optical fiber core on the lower side of the line, the reference light incident on the optical fiber core on the upper side of the optical fiber is emitted to the outside of the optical fiber, and the reference light is emitted. A light receiving device for detecting contrast light, which is capable of changing the intensity of the contrast light emitted outside the optical fiber core wire and the intensity of communication light propagating through the optical fiber core wire. Is provided.

The second invention is, as the light intensity changing means in the light receiving device of the first invention, the intensity of the reference light emitted outside the optical fiber core by changing the shape of the curve given to the optical fiber core, and It is characterized in that a bending means capable of changing the intensity of communication light is provided.

According to a third aspect of the present invention, since the bending means in the light receiving device of the second aspect of the present invention holds the optical fiber core wire to give a predetermined bend, a holding recess having a recess having a first radius of curvature is provided. A holding projection having a convex portion having a second radius of curvature facing the holding concave portion and a side concave portion having a third radius of curvature that is on both wings of the convex portion and has a single curved surface, and the holding concave portion and the holding concave portion. The holding member is arranged between the holding convex portion and the holding concave portion and the holding convex portion, and is constituted by an attachment member capable of pressing and holding the optical fiber core wire.

According to a fourth aspect of the present invention, since the bending means in the light receiving device of the second aspect of the present invention holds the optical fiber core wire to give different predetermined curvatures, a holding recess formed with a recess having a first radius of curvature, A holding convex portion having a convex portion having a second radius of curvature facing the holding concave portion and a side concave portion having a third radius of curvature which is on both blades of the convex portion and has a curved surface in one; and the holding concave portion. It is arranged between both wings of the holding convex portion, and is constituted by two holding members which can press and hold the optical fiber core wire together with the holding concave portion and the holding convex portion. .

According to a fifth aspect of the invention, the bending means in the light receiving device of the second invention comprises the first bending means and the second bending means, and the first bending means holds the optical fiber core wire to give a predetermined bending. Therefore, the holding concave portion having the concave portion having the first radius of curvature, the convex portion having the second radius of curvature facing the holding concave portion, and the third concave portion having one curved surface on one blade of the convex portion are formed. A holding convex portion formed with a side concave portion having a radius of curvature and a side convex portion having a first curvature radius on the other blade of the convex portion and having a curved surface in one, and the holding concave portion and the holding convex portion. The second bending means is disposed between the one wing and is configured by an attachment member capable of pressing and holding the optical fiber core wire together with the holding concave portion and the holding convex portion. The first radius of curvature for holding the fiber core wire to give a predetermined curvature. The holding concave portion having the concave portion, the convex portion having a second radius of curvature facing the holding concave portion, and the convex surface of the convex portion on one blade opposite to the side concave portion of the first bending means, and the curved surfaces are unified. A side projection having a third radius of curvature and a side projection having a first radius of curvature on the other blade of the projection and having a curved surface that is the same; It is arranged between the holding wing and the one wing, and is constituted by an attachment member capable of pressing and holding the optical fiber core wire together with the holding recess and the holding projection. .

According to a sixth aspect of the present invention, since the bending means in the light receiving device of the second aspect of the present invention holds the optical fiber core wire to give a predetermined bending, a holding concave portion having a concave portion having a first radius of curvature is provided. A convex portion having a second radius of curvature facing the sandwiching concave portion and a side concave portion having a third radius of curvature which is on one of the blades of the convex portion and has a curved surface and a curved surface which is on the other blade of the convex portion And a sandwiching convex portion formed with a side convex portion having the first radius of curvature, and the sandwiching concave portion and the one blade of the sandwiching convex portion, and the sandwiching concave portion and the sandwiching portion. It is characterized in that it is constituted by an attachment member capable of pressing and holding the optical fiber core wire together with the convex portion.

A seventh invention is a method of using the light receiving device of the third invention or the fourth invention, wherein the position of the attachment member is adjusted to suppress the loss of communication light to a predetermined level, The optical fiber core wire is curved so that the reference light emitted to the outside of the fiber core wire can be detected to perform the core wire comparison. In other words, in the curved shape given to the optical fiber core by using the light receiving device in order to detect the reference light emitted to the outside of the optical fiber core while adjusting the change of the communication light to a predetermined level, the attachment member The position of is adjusted so as to reduce the curvature of the portion of the reference light that does not contribute to the reception of the optical fiber even when the reference light is emitted outside the optical fiber core, and the total amount of the curvature is reduced.

The eighth invention is another method using the light-receiving device of the third invention or the fourth invention, wherein the position of the attachment member is adjusted so that the traveling direction of the reference light, that is,
The optical fiber core wire is curved so that the upper and lower parts of the optical path can be determined, and the core wire is compared. In other words, in order to determine the upper and lower parts of the optical line, in the curved shape given to the optical fiber core by using the light receiving device, the position of the attachment member is adjusted, and the traveling direction of the reference light and the reference light are measured. The curved shape is set so that the reference light can be detected only when the curved directions that can be emitted out of the line match.

A ninth invention is a method of using the light-receiving device of the fifth invention, wherein the first bending means and the second bending means are switched to bend the optical fiber core wire, and the upper and lower parts of the optical line are Is specified.

A tenth aspect of the present invention is a method of using the optical signal receiving device for optical fiber comparison, characterized in that the light receiving device itself of the sixth invention is replaced to identify the upper and lower parts of the optical line. For example, holding the optical fiber core from below with a light receiving device,
The upper and lower parts of the optical path are specified by holding the light receiving device from above.

By the means described above, in addition to 1.31 μm and 1.55 μm which have been conventionally used as communication light, L
Even if the wavelength in the band (1.565 μm to 1.625 μm) band is used, since the core line comparison is performed, the loss of the communication light generated when the optical fiber core wire is curved in the light receiving device is suppressed, Moreover, the reference light can be efficiently emitted to the outside of the optical fiber core for detection. Therefore, deterioration of communication quality can be prevented. In addition, the directionality (direction of travel) of the reference light can be reliably determined, and not only the corresponding optical fiber core can be specified, but also the upper and lower parts of the optical line for determining the cutting position of the optical fiber in detail. The determination can be made reliably. Therefore, it is possible to prevent erroneous disconnection and erroneous connection of the optical fiber core wire.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 3 shows the first embodiment of the present invention.
As an example, a light receiving device (optical signal receiving device for optical fiber comparison)
The configuration of will be described. FIG. 3 shows a light receiving device 4 according to this embodiment.
FIG. 3 is a diagram showing the entire configuration of FIG. 1 in a state in which the optical fiber core wire is not in pressure contact / clamping (in a gripped state, and not held). Of these, FIG. 3A is a side view of the light receiving device, and FIG.
(B) is a top view.

As shown in FIGS. 3 (a) and 3 (b), the light receiving device 4 of the present embodiment is provided with a bending means as the light intensity changing means, and holds the optical fiber core wire to make a predetermined bending. To give, (1) predetermined radius of curvature (first radius of curvature)
Holding recess 10a in which the concave portion 10a is formed, (2) a convex portion 15a having a predetermined radius of curvature (second radius of curvature), and a predetermined radius of curvature on both wings of the convex portion 15a to make curved surfaces one. (3) A sandwiching projection 15 having two side recesses 15b and 15c (third radius of curvature), and (3) a sandwiching recess 10 and two blades of the sandwiching projection 15 are provided. Two attachment members 30 and 35 capable of pressing and holding the optical fiber core wire together with the holding convex portion 15, and (4) a grip 20 to be gripped by an operator when holding the optical fiber core wire.
And (5) a trigger 25 that the operator pulls toward the front (grip side) when carrying out the holding work, and (6) a light receiving element 40 built in the holding recess 10.

In the following description, referring to FIG. 4 and FIG.
The side concave portion indicated by reference numeral 15b is on the left wing of the holding convex portion 15 and is therefore referred to as a side concave portion L. The side concave portion indicated by reference numeral 15c is on the right wing of the holding convex portion 15 and is therefore called a side concave portion R.

Similarly, in FIG. 4 and FIG.
The attachment member indicated by is located on the left side of the holding projection 15, and is therefore referred to as an attachment member L. The attachment member indicated by reference numeral 35 is located on the right side of the holding projection 15 and is therefore referred to as an attachment member R.

The holding recess 10 is a portion forming the main body of the light receiving device 4. As shown in FIG. 3B, the holding recess 10 is formed with a recess 10a for giving a curvature to the optical fiber core wire. There is. The curved shape of the recess 10a is symmetrical. The light receiving element 40 is arranged in the holding recess 10 so that the holding projection 15 can be seen from the center (bottom) of the curve of the recess 10a. Further, as shown in FIG. 3A, a groove portion 10e having a shape for accommodating the optical fiber core wire is formed in the recess 10a in order to properly hold the optical fiber core wire. As the light receiving element 40, for example, a Ge photodiode, an InGaAs photodiode, or the like is used.

Further, as shown in FIG. 3 (b), when the operator grips the grip 20 and pulls the trigger 25 to the front (grip side), the gripping concave portion 10 interlocks with the movement of the gripping concave portion 10, as shown in FIG. 3B. Slide mechanism 10b for moving 15 toward the holding recess 10; slide mechanism 10c for holding the holding attachment member L30 and adjusting its position;
A slide mechanism 10d for holding the holding attachment member R35 and adjusting the position thereof is formed.

In the following description, in FIGS. 4 and 5,
Since the slide mechanism indicated by reference numeral 10b is located at the center,
The slide mechanism C is referred to as a slide mechanism C, and the slide mechanism 10c is located on the left side.
Since the slide mechanism indicated by 0d is located on the right side, it is referred to as a slide mechanism R.

The holding convex portion 15 is provided on the main body of the light receiving device 4 so as to face the holding concave portion 10. Specifically, as the holding convex portion 15, as shown in FIG. 3B, in order to hold the optical fiber core wire and give a predetermined curvature, a convex portion 15a having a predetermined radius of curvature facing the concave portion 10a is provided. And a side concave portion L15b and a side concave portion R15c having a predetermined radius of curvature on both the left and right wings of the convex portion 15a and having the same curved surface. Here, the side recesses L15b and the side recesses R15c have the same radius of curvature (third radius of curvature). Further, as shown in FIG. 3A, the holding convex portion 15 has a groove portion 15d having a shape for accommodating the optical fiber core wire so as to properly hold the optical fiber core wire, from the side concave portion L15b to the convex portion 15a and the side concave portion. R
It is formed over 15c.

The curved shape of the holding convex portion 15 is bilaterally symmetrical, and is arranged so that its center (the top of the convex portion 15a) is desired at the center of the holding concave portion 10, in other words, the light receiving element 40 is desired. . In the present example, the holding convex portion 15 has the center line of its symmetrical curvature (the apex of the convex portion 15a and the convex portion 15a).
The line connecting the curved center point of a) and the symmetrical center line of the sandwiched convex portion 10 (the line connecting the bottom of the concave portion 10a and the curved center point of the concave portion 10a) coincides with each other, and the slide mechanism C10b.
It is supposed to be moved by.

The attachment member L30 is shown in FIG.
As shown in (b), in order to give a curvature to the optical fiber core wire, a projection on the side of the holding recess 10 (hereinafter, a holding recess side projection)
30a and a convex portion on the side concave portion L15b side of the holding convex portion 15 (hereinafter referred to as a holding convex portion side convex portion) 30b are formed. Here, the radius of curvature of the holding concave-side convex portion 30a is equal to the radius of curvature of the concave portion 10a (first radius of curvature), and the holding convex-side convex portion 3a.
The radius of curvature of 0b is equal to the radius of curvature of the side recess L15b (third radius of curvature). Further, as shown in FIG. 3A, the attachment member L30 properly holds the optical fiber core wire. Therefore, the groove portion on the side of the holding recess 10 having a shape for accommodating the optical fiber core wire (hereinafter referred to as a holding recess side groove portion). 30c and a groove portion on the holding convex portion 15 side (hereinafter, a holding convex portion side groove portion) 30d are formed.

The attachment member L30 is held by a slide mechanism L10c formed in the holding recess 10, and its position can be directly adjusted manually, or an operator can grasp the grip 20 and bring the trigger 25 to the front side (grip side). When the holding convex portion 15 is slid toward the holding concave portion 10 by pulling it toward the holding concave portion 10, the pressing force of the holding convex portion 15 indirectly slides to adjust the position.

The attachment member R35 is shown in FIG.
As shown in (b), a convex portion on the side of the holding concave portion 10 (hereinafter, a convex portion on the holding concave portion side) for giving a curvature to the fiber core wire 35.
a and the convex portion on the side concave portion R15c side of the holding convex portion 15 (hereinafter,
A sandwiching convex portion side convex portion) 35b is formed. Here, the radius of curvature of the holding concave side convex portion 35a is equal to the radius of curvature of the concave portion 10a (first radius of curvature), and the curvature radius of the holding convex side convex portion 35b is the radius of curvature of the side concave portion R15c (third curvature). Radius). In addition, the attachment member R35,
As shown in FIG. 3A, in order to properly hold the optical fiber core wire, the holding concave portion 10 having a shape in which the optical fiber core wire is accommodated.
A groove portion on the side (hereinafter, a groove portion on the sandwiching recess side) 35c and a groove portion on the side of the sandwiching convex portion 15 (hereinafter, a groove portion on the sandwiching convex portion side) 35d are formed.

This attachment member R35 is held by a slide mechanism R10d formed in the holding recess 10, and its position can be adjusted directly by hand, or an operator can grasp the grip 20 and bring the trigger 25 to the front side (grip side). When the holding convex portion 15 is slid toward the holding concave portion 10 by pulling it toward the holding concave portion 10, the pressing force of the holding convex portion 15 indirectly slides to adjust the position.

Here, in order to press and hold the optical fiber core wire so that it can be held, the concave portion 10a, the holding concave side convex portion 30a and the holding concave side convex portion 35a have the same radius of curvature (first radius of curvature). A side recess L15a and a side recess R15b,
The holding convex side convex portion 30b and the holding convex side convex portion 35b have the same radius of curvature (third radius of curvature).

In the light receiving device 4 having the above-mentioned structure, the attachment member L30 and the attachment member R35.
(1) Attachment member L3 by adjusting the position of
0 and the attachment member R35 both hold the concave portion 10
The optical fiber core wire along with the attachment member L30.
Between the holding projection 15 and the holding projection 15, between the holding projection 15 and the holding recess 10, between the attachment member R35 and the holding projection 15, or (2) the attachment member L3.
Only 0 is placed along the holding recess 10 and the attachment member R3
5 along the holding convex portion 15, and the optical fiber core wire is provided between the attachment member L30 and the holding convex portion 15, and the holding convex portion 15
And the holding recess 10 or between the attachment member R35 and the holding recess 10 or (3) the attachment member L30 is placed along the holding protrusion 15 and only the attachment member R35 is placed along the holding recess 10. , A state in which the optical fiber core wire is passed between the attachment member L30 and the holding concave portion 10, between the holding convex portion 15 and the holding concave portion 10, between the attachment member R35 and the holding convex portion 15, or (4) Both the attachment member L30 and the attachment member R35 are provided along the holding convex portion 15, and the optical fiber core wire is provided between the attachment member L30 and the holding concave portion 10, between the holding convex portion 15 and the holding concave portion 10, and between the attachment member R35 and the holding concave portion 10. When the operator grips the grip 20 and pulls the trigger 25 toward you (on the grip side) while passing through the recess 10, It may provide various predetermined curved Aiba core wire and pressed and clamped.

The shape of the curve given to the optical fiber core wire in the state of (1) and the shape of the curve given to the optical fiber core wire in the state of (4) are both symmetric, and the state of the above (2) Both the shape of the curve given to the optical fiber core and the shape of the curve given to the optical fiber in the state (3) are asymmetric.

However, in general, the convex portion 15a of the holding convex portion 15 is
Radius of curvature (second radius of curvature) and side recess L15
b, the radius of curvature of the side recess R15c (the third radius of curvature) is
Since it is smaller than the radius of curvature (first radius of curvature) of the concave portion 10a of the holding concave portion 10, the radius of curvature of the curved shape given to the optical fiber core wire in the state of (1) above is in the state of (4) above. It is smaller than the curved shape given to the core wire.

The holding convex portion 15 with respect to the holding concave portion 10
Slide mechanism C10b and attachment member L30
Of the slide mechanism L10c and the attachment member R3
The slide mechanism R10d of No. 5 is composed of a guide groove and a guide (not shown) in this embodiment, but if it is a mechanism capable of holding the optical fiber core wire and giving a predetermined curvature,
anything is fine. As an example, the holding concave portion 10 and the holding convex portion 1
5, a rotation mechanism in which the attachment member L30 and the attachment member R35 are locked by fulcrums can be employed.

[Second Embodiment] Next, referring to FIG. 4, as a second embodiment of the present invention, the light receiving device 4 described in the first embodiment will be described.
How to use is explained. FIGS. 4A and 4B show a curved state given to the optical fiber core wire 1 when performing the core wire comparison using the light receiving device 4.

In FIG. 4A, the reference light is incident on the optical fiber core wire 1 from the light source device 2 installed on the upper side (the left side in FIG. 4A) of the optical fiber core wire 1 through the entrance device 3. The reference light travels from the attachment member L30 side to the attachment member R35 side (from the left side to the right side in FIG. 4A), moves the attachment member L30 along the holding concave portion 10, and holds the attachment member R35 in a convex shape. A state where the operator grips the grip 20 along the portion 15 and pulls the trigger 25 toward the front side (grip side) to give a curve to the optical fiber core wire 1 is shown. Therefore, the optical fiber core wire 1 is held between the holding convex portion 15 and the attachment member L30, between the holding concave portion 10 and the holding convex portion 15, and between the holding concave portion 1 and the holding concave portion 1.
It is pressed and held between 0 and the attachment member R35, and is curved asymmetrically.

In FIG. 4B, the upper side of the optical fiber core wire 1 is the right side opposite to that of FIG. 4A. That is, the reference light is incident on the optical fiber core 1 from the light source device 2 installed on the upper side (right side in FIG. 4B) of the optical fiber core 1 through the incident device 3, and the reference light is the attachment member. R35
Side to the attachment member L30 side (from the right side to the left side in FIG. 4B), the attachment member L
30 along the holding convex portion 15, and the attachment member R3
5 shows the curved state given to the optical fiber core wire 1 when the operator grips the grip 20 and pulls the trigger 25 toward the front side (grip side) by placing 5 along the holding recess 10. Therefore, the optical fiber core wire 1 is pressed and held between the holding concave portion 10 and the attachment member L30, between the holding concave portion 10 and the holding convex portion 15, and between the holding convex portion 15 and the attachment member R35. , Is asymmetrically curved.

As a result, in the curved state of FIG. 4A, the curved shape of the optical fiber core wire 1 is asymmetrical even when seen from the light receiving element 40, so that the light receiving element 40 including the convex portion 15a is curved. The curve on the side of the attachment member L30 up to the point where the reference light emitted to the outside of the optical fiber core wire 1 can be received by the light receiving element 40 and contributes to the core wire contrast,
The curvature of the curvature radius is small, and the curvature on the side of the attachment member R35 past the light receiving element 40 is a portion where the light receiving element 40 does not receive the reference light even if the reference light is emitted to the outside of the optical fiber core wire 1 and does not contribute to the core wire contrast. Therefore, it has a gentle curvature with a sufficiently large radius of curvature.

In the curved state of FIG. 4 (b),
Similarly, when viewed from the light receiving element 40, the curved shape of the optical fiber core wire 1 is asymmetrical to the left and right, but conversely, the attachment member R up to the light receiving element 40 including the curvature of the convex portion 15a.
The curvature on the 35 side is a portion that can receive the reference light emitted to the outside of the optical fiber core wire 1 by the light receiving element 40 and contributes to the core wire contrast, and has a small radius of curvature, and the attachment member that has passed the light receiving element 40. The curve on the L30 side is a portion that does not contribute to the core line contrast because the light receiving element 40 does not receive it even if the reference light is emitted to the outside of the optical fiber core line 1, and is a gentle curve with a sufficiently large radius of curvature. .

In this way, the operator adjusts the positions of the attachment member L30 and the attachment member R35,
By making the curved state shown in FIGS. 4A and 4B, even if the reference light is emitted to the outside of the optical fiber core wire 1, the curvature of the portion that does not contribute to the reception of light for the core wire contrast is alleviated. Therefore, it is possible to reduce the total amount of bending in the light receiving device 4, and it is possible to reliably detect the reference light while suppressing the loss of the communication light.

Here, the convex portion 15a, the side concave portion L15b, and the side concave portion R15 which radiate the reference light to the outside of the optical fiber core wire 1 and constitute the curvature of the portion contributing to the light reception for the core wire contrast.
The curvature radii (second radius of curvature, third radius of curvature) of c, the gripping convex portion-side convex portion 30b, and the gripping convex portion-side convex portion 35b are the same even if the optical fiber core wire 1 is clamped. 1 is not damaged or lost, and the reference light can be emitted to the outside of the optical fiber core wire 1 so that the reference light can be surely detected, and the loss of the communication light can be suppressed to a predetermined level. A value, for example, selected from the range of 3 mm to 10 mm is set. The side recess L15b and the side recess R15c are
The third radius of curvature may be larger than the second radius of curvature because it has a function of smoothly guiding the optical fiber core wire 1 which is sharply curved by the convex portion 15a to the outside of the light receiving device 4.

Further, even if the reference light is emitted to the outside of the optical fiber core wire 1, a concave portion 10a, a sandwiching recess side convex portion 30a and a sandwiching recess side convex portion which constitute a curve of a portion which does not contribute to the reception of light for the purpose of the core wire contrast. Each radius of curvature of the portion 35a (first radius of curvature) is
A value that does not cause damage or loss of the optical fiber core wire 1 even if the optical fiber core wire 1 is held, and does not cause emission of the reference light to the outside of the optical fiber core wire 1 or loss of communication light. For example, it is set by selecting from a range of 30 mm to infinity (straight line).

For example, when the location where the optical fiber contrasting work is performed is close to the light source device 2 and the intensity of the optical contrast light is sufficiently strong, the optical fiber optical fiber 1 of the optical contrast fiber 1 for the optical contrast light can be used even if the optical fiber is gently curved.
Since a large amount of radiation to the outside can be obtained, the radius of curvature of the portion of the reference light that radiates outside the optical fiber core wire 1 and contributes to the reception of light for the core wire contrast is increased. It is possible to further suppress the loss. In addition to that, if there is a sufficient margin for the predetermined required value in the loss of the communication light generated by the bending, the reference light is further radiated to the outside of the optical fiber core wire 1 within the margin, and the core wire The radius of curvature of the portion that contributes to the reception of light for contrast is reduced, and as a result, the amount of radiation of the contrast light outside the optical fiber core wire 1 is increased,
It is possible to increase the detection sensitivity.

Of course, in the loss of the communication light generated by the bending, if there is a sufficient margin for a predetermined required value, both the attachment member L30 and the attachment member R35 are placed along the holding concave portion 10 and the optical fiber core wire. 1 is an attachment member L30 and an attachment member R3
5 may be held between the holding convex portion 15 and the holding convex portion 15 to perform the core line comparison.

Further, the wavelength of the communication light is not in the L band band, but 1.31 μm or 1.55 μ which has been used conventionally.
In the case of m or the like, the optical fiber core wire 1 is held by the attachment member L30 and the attachment member R35 and the holding concave portion 10 while the attachment member L30 and the attachment member R35 are along the holding convex portion 15. You can do a control.

As described above, not only the position adjustment of the attachment members L30 and R35 but also the reference light is emitted to the outside of the optical fiber core wire 1 according to external factors and contributes to the reception of light for the core wire reference. It is also possible to change the combination of the radii of curvature of the portions to be formed to form the curve given to the optical fiber core wire 1 into a predetermined shape.

[Third Embodiment] Next, referring to FIG. 5, as a second embodiment of the present invention, the light receiving device 4 described in the first embodiment will be described.
Another usage of is explained. FIGS. 5A and 5B show a curved state and a state in which the reference light travels when the upper and lower portions of the optical line are determined using the light receiving device 4.

In FIG. 5A, the traveling direction of the reference light and the curved state of the optical fiber core wire 1 are the same as those in FIG. 4A. That is, the upper side of the optical fiber core wire 1 (left side in FIG. 5A)
The reference light is incident on the optical fiber core wire 1 from the light source device 2 installed on the optical fiber 1 through the incident device 3, and the reference light is transmitted from the attachment member L30 side to the attachment member R35 side (from left side to right side in FIG. 5A). ), The attachment member L30 is moved along the holding concave portion 10, the attachment member R35 is moved along the holding convex portion 15, the operator grips the grip 20, and the trigger 25 is on the front side (grip side).
The drawing shows the state of bending given to the optical fiber core wire 1 when pulled out. Therefore, the optical fiber core wire 1 is provided between the attachment member L30 and the holding convex portion 15, between the holding concave portion 10 and the holding convex portion 15, and between the holding concave portion 10 and the attachment member R.
It is sandwiched between 35 and curved.

In FIG. 5B, the upper side of the optical fiber core wire 1 is the right side opposite to that of FIG. 5A, but the curved state of the optical fiber core wire 1 is the same as that of FIG. 5A. . That is, the reference light is incident on the optical fiber core wire 1 from the light source device 2 installed on the upper side (the right side in FIG. 5B) of the optical fiber core wire 1 through the incident device 3, and the reference light is the attachment member. R
35 side to attachment member L30 side (Fig. 5 (b)
Then, the attachment member L30 is moved along the holding recess 10 and the attachment member R35 is moved along the holding projection 15 so that the operator grips the grip 20.
When grasping and pulling the trigger 25 toward you (on the grip side),
It shows a state of bending given to the optical fiber core wire 1. Therefore, the optical fiber core wire 1 is held between the holding convex portion 15 and the attachment member L30, between the holding concave portion 10 and the holding convex portion 15, and between the holding concave portion 10 and the attachment member R35, and is curved. is doing.

In contrast to the core wire, in FIG. 5A, the reference light is a curve of a portion of the reference light which is emitted outside the optical fiber core wire 1 and contributes to the reception of light for the core wire contrast. It passes through the pressure contact surface between the side concave portion L15b and the convex side convex portion 30c and reaches the convex portion 15a and the light receiving element 40, and the traveling direction of the reference light and the outside of the optical fiber core wire 1 of the reference light. Since the direction of the curve that promotes the emission coincides, the reference light is emitted to the light receiving element 40 outside the optical fiber core wire 1, and the light receiving element 40 can detect the reference light.

In FIG. 5B, the contrast light is the convex portion 1
After passing 5a and the light receiving element 40, the light passes through the pressure contact surface between the side concave portion L15b and the convex side convex portion 30c, and the traveling direction of the reference light and the emission of the reference light to the outside of the optical fiber core wire 1 are detected. Since the direction of the accelerating curve does not match, even if the reference light is emitted to the outside of the optical fiber core wire 1, it is not emitted to the light receiving element 40, and the light receiving element 40 cannot detect the reference light.

Therefore, even if the traveling direction of the reference light is unknown, the results obtained by performing the core line comparison in different curved states shown in FIGS. 4 (a) and 4 (b) are shown in FIG. 4 (a). 4), it is possible to detect the reference light in the curved state, but not the reference light in the curved state shown in FIG. 4B, the reference light is attached from the attachment member L30 side to the attachment member R3.
You can see that it is proceeding to side 5. That is, the upper part of the optical fiber core wire 1 in this case is attached to the attachment member L.
It can be specified as the 30 side.

The reverse is also true. If the contrast light cannot be detected in the curved state shown in FIG. 4A and the contrast light can be detected in the curved state shown in FIG. It can be seen that it is proceeding from the attachment member R35 side to the attachment member L30 side. That is, the upper part of the optical fiber core wire 1 in this case can be specified as the attachment member R35 side.

As described above, the operator can perform the operation shown in FIG.
The positions of the attachment member L30 and the attachment member R35 are adjusted so that the curved state shown in FIG.
By specifying the direction of curvature in which the reference light can be detected, it is possible to reliably specify the traveling direction of the reference light, that is, the upper and lower portions of the optical line.

As the bending means, as shown in FIGS. 4A and 4B, as long as it can hold the optical fiber core wire 1 and give a predetermined bending, the bending means shown in FIG. The configuration is not limited to that shown in FIG.

For example, in accordance with the configuration of FIG. 3, an uneven portion having the attachment member L30 and the holding concave portion 10 as one solid and an uneven portion having the attachment member R35 and the holding convex portion 15 as one solid are shown. 4 (a) constitutes a bending means for giving the optical fiber core wire 1 the bending shown in FIG. 4 (a), and, apart from this, according to the configuration of FIG. 3, the attachment member R35 and the holding concave portion 10 are formed as one solid unevenness. The part and the concavo-convex part having the attachment member L30 and the holding convex part 15 as one solid form a curving means for giving the optical fiber core wire 1 a curving shown in FIG. 4B, and these two kinds of curving means are provided. Is provided for the light receiving device 4. In such a light receiving device,
By switching between two types of bending means and holding the optical fiber core wire 1 to give a curve, the core wire can be compared. The principle of specifying the optical fiber core wire 1 in the core wire contrast and specifying the upper and lower parts of the optical fiber are as described above.

In this case, one light receiving element 40 can be provided so as to correspond to both of the two bending means, or two light receiving elements 40 can be provided separately for the two bending means.

Further, according to the structure of FIG. 3, the attachment member L30 and the holding concave portion 10 are formed as one solid uneven portion, and the attachment member R35 and the holding convex portion 15 are formed as one solid uneven portion. 4 (a) is provided in the light receiving device 4 by configuring only the bending means for giving the optical fiber core wire 1 the bending, or the attachment member R35 and the holding recess 10 are made into one solid according to the structure of FIG. And the uneven parts
The attachment member L30 and the concavo-convex portion having the sandwiching convex portion 15 as one solid form only the bending means for giving the optical fiber core wire 1 the bending shown in FIG. When the operator changes the light receiving device 4 itself provided with only the bending means of the kind, for example, the optical fiber core wire 1 is held by the light receiving device 4 from below, or the optical fiber core wire 1 is held by the light receiving device 4 from above, thereby A control can be done. Alternatively,
Hold the optical fiber core wire 1 from the right side with the light receiving device 4,
The operator can carry out the optical fiber comparison by holding the light receiving device 4 itself so that the operator holds the light receiving device 4 from the left side. The principle of specifying the optical fiber core wire 1 in the core wire contrast and specifying the upper and lower parts of the optical fiber are as described above.

[0075]

As can be seen from the above description, according to the present invention, a means for changing the intensity of the communication light and the intensity of the reference light to be emitted to the outside of the optical fiber core, for example, the optical fiber core is used. Since the light receiving device is provided with a bending means for changing the shape of the given curve, the L band (1.5
65 μm to 1.625 μm) Even if a long wavelength such as a wavelength band is used, the loss of communication light is suppressed to a predetermined level, and 1.31 μm and 1.55 μm which are conventionally used. With respect to the communication light of the wavelength, it is possible to detect the contrast light more efficiently while reducing the loss more than ever before, and thus it is possible to prevent the deterioration of the communication quality.

Further, according to the present invention, since the curved shape which is asymmetrical to the left and right can be given to the optical fiber core by the bending means, the directionality of the reference light can be surely determined, and the corresponding optical fiber core can be specified. Of course, since the cutting position of the optical fiber core is determined in detail, the upper part and the lower part of the optical line can be surely specified, so that the optical fiber core can be prevented from being erroneously cut or erroneously connected.

As described above, the present invention greatly contributes to reduction of construction work and improvement of reliability of optical communication services in the future.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a conventional method of checking a core wire.

FIG. 2 is a diagram showing a curved shape given to an optical fiber core wire by a conventional optical signal receiving device for optical fiber comparison.

FIG. 3 is a diagram showing the configuration of an optical signal receiving device for optical fiber comparison according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a curved state when performing the core wire comparison as a method of using the optical signal receiving device for the core wire comparison according to the second embodiment of the present invention.

FIG. 5 is a view showing a method of using the optical signal receiving device for optical fiber comparison according to the third embodiment of the present invention), in which a curved state and a progress of the optical signal for optical fiber control when determining the upper and lower portions of the optical line are determined. The figure which shows a direction.

[Explanation of symbols]

1 Optical fiber core wire 2 Light source device (optical signal light source device for optical fiber comparison) 3 Incident device (optical signal optical input device for optical fiber comparison) 4 Light receiving device (optical signal light receiving device for optical fiber comparison) 10 Holding recess (light intensity) Part of changing means, part of bending means) 10a Recess 10b Sliding mechanism C 10c Sliding mechanism L 10d Sliding mechanism R 10e Groove 15 Holding pinch (part of light intensity changing means, part of bending means) 15a Convex 15b Side recess L 15c Side recess R 15d Groove 20 Grip 25 Trigger 30 Holding attachment member (part of light intensity changing means, part of bending means) 30a Holding concave side convex portion 30b Holding convex side convex portion 30c Holding concave side groove Part 30d Holding convex part side groove part 35 Holding attachment member (part of light intensity changing means, part of bending means) 35a Holding concave side convex part 35b Holding convex part side convex part 35c Holding concave side groove portion 35d Holding convex side groove portion 40 Light receiving element (core signal optical signal receiving element for reference)

Continued front page    (72) Inventor Masao Tachizo             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 2G086 AA01                 2H038 CA39

Claims (10)

[Claims] 1. Used in a system for performing core wire comparison in order to avoid erroneous disconnection and connection of optical fiber core wires in the construction and maintenance of an optical fiber communication network, and the optical fiber core is used at the lower side of the optical fiber core wires. By giving a curvature to the optical fiber core wire, the optical fiber core wire optical signal for incident on the optical fiber core wire on the upper side of the optical fiber core wire is radiated to the outside of the optical fiber core wire, and the radiated core wire reference is emitted. An optical signal receiving device for optical fiber contrast detection for detecting an optical signal for optical fiber, the intensity of the optical signal for fiber optical fiber identification to be emitted outside the optical fiber optical fiber, and an optical signal for communication propagating in the optical fiber optical fiber. An optical signal receiving device for optical fiber comparison, comprising a light intensity changing means capable of changing the intensity of the optical fiber. 2. The intensity of the optical signal for optical fiber comparison according to claim 1, wherein the optical intensity changing means changes the shape of the curve given to the optical fiber optical fiber to radiate the optical fiber for optical fiber comparison outside the optical fiber optical fiber. An optical signal receiving device for optical fiber comparison, comprising a bending means capable of changing the intensity of the optical signal for communication propagating through the optical fiber optical fiber. 3. The portion according to claim 2, wherein the bending means holds the optical fiber core wire to give a predetermined different curvature, so that a portion having a recessed portion having a first radius of curvature (hereinafter, “holding recessed portion”) is formed. ), And a portion having a convex portion having a second radius of curvature facing the holding concave portion and a side concave portion having a third radius of curvature that is on both wings of the convex portion and has a curved surface in one (hereinafter referred to as “holding portion”). (Hereinafter referred to as a “projection”) and an attachment member that is disposed between the holding recess and the holding projection, and that is capable of holding the optical fiber core wire together with the holding recess and the holding projection by pressing. An optical signal receiving device for optical fiber comparison, which is characterized in that 4. The portion according to claim 2, wherein the bending means holds the optical fiber core wire to give a predetermined different curvature, so that a portion having a recess having a first radius of curvature (hereinafter referred to as “holding recess”). ), And a portion having a convex portion having a second radius of curvature facing the holding concave portion and a side concave portion having a third radius of curvature that is on both wings of the convex portion and has a curved surface in one (hereinafter referred to as “holding portion”). (Hereinafter referred to as “projection”), and two attachments that are arranged between the sandwiching recess and the wings of the sandwiching projection, and that are capable of holding the optical fiber core together with the sandwiching recess and the sandwiching projection by pressing. An optical signal receiving device for optical fiber comparison, comprising: a member. 5. The bending means according to claim 2, wherein the bending means includes a first bending means and a second bending means, and the first bending means holds the optical fiber core wire to give a predetermined bending, A portion in which a concave portion having a first radius of curvature is formed (hereinafter referred to as a “holding concave portion”), a convex portion having a second radius of curvature facing the holding concave portion, and one curved surface on one blade of the convex portion A side concave portion having a third radius of curvature and a side convex portion having a first curvature radius on the other blade of the convex portion and having the same curved surface (hereinafter referred to as “clipping convex portion”). Said), and an attachment member that is arranged between the sandwiching concave portion and the one blade of the sandwiching convex portion, and is capable of sandwiching the optical fiber core wire together with the sandwiching concave portion and the sandwiching convex portion by pressing. And the second bending means includes the optical fiber core. In order to hold a line to give a predetermined curvature, a portion having a concave portion having a first radius of curvature (hereinafter referred to as a "holding concave portion") and a convex portion having a second radius of curvature facing the holding concave portion The convex portion has a side concave portion on one side opposite to the side concave portion of the first bending means and has a third curvature radius that makes one curved surface and the convex portion has a curved surface on the other side blade. A portion where the side convex portion having the first radius of curvature to be made one (hereinafter referred to as “grasping convex portion”) is disposed between the clamping concave portion and the one wing of the clamping convex portion, 2. An optical signal receiving device for optical fiber comparison, comprising an attachment member capable of pressing and holding the optical fiber optical fiber together with the holding concave portion and the holding convex portion. 6. The portion according to claim 2, wherein the bending means holds the optical fiber core wire to give a predetermined bending, so that a portion having a recess having a first radius of curvature (hereinafter referred to as “holding recess”). ) And a convex portion having a second radius of curvature facing the holding concave portion and a side concave portion having a third curvature radius on one blade of the convex portion and having a curved surface in one and the other blade of the convex portion. A part in which a side convex portion having the first radius of curvature that forms a curved surface is formed (hereinafter referred to as a “clipping convex portion”), and the grasping concave portion and the one blade of the grasping convex portion. An optical signal receiving device for optical fiber comparison, which is arranged between the optical fiber optical fiber and the holding concave portion and the holding convex portion, and an attachment member capable of pressing and holding the optical fiber optical fiber. 7. A method of using the optical signal receiving device for optical fiber comparison according to claim 3 or 4, wherein the position of the attachment member is adjusted to reduce the loss of the optical signal for communication to a predetermined level. The optical fiber core wire is provided with a curvature capable of detecting the optical signal for optical fiber core wire emission emitted outside the optical fiber optical fiber core while suppressing the optical fiber core wire and performing optical fiber core wire comparison. How to use the optical signal receiver. 8. A method for using the optical signal receiving device for optical fiber comparison according to claim 3 or 4, wherein the position of the attachment member is adjusted to move the optical signal for optical fiber inspection, That is, a method of using the optical signal receiving device for optical fiber comparison, which is characterized in that the optical fiber optical fiber is curved so as to determine the upper part and the lower part of the optical line and the optical fiber is compared. 9. A method for using the optical signal receiving device for optical fiber comparison according to claim 5, wherein the optical fiber optical fiber is bent by switching between the first bending means and the second bending means. , A method of using an optical signal receiving device for optical fiber comparison, characterized by specifying the upper and lower parts of an optical line. 10. A method of using the optical signal receiving device for optical fiber comparison, wherein the optical signal receiving device for optical fiber comparison according to claim 6 is replaced to identify the upper and lower parts of the optical line.