JP2012127763A - Optical power meter and optical power measurement method - Google Patents

Optical power meter and optical power measurement method Download PDF

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JP2012127763A
JP2012127763A JP2010278645A JP2010278645A JP2012127763A JP 2012127763 A JP2012127763 A JP 2012127763A JP 2010278645 A JP2010278645 A JP 2010278645A JP 2010278645 A JP2010278645 A JP 2010278645A JP 2012127763 A JP2012127763 A JP 2012127763A
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fiber core
light intensity
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JP5629567B2 (en
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Tatsuyuki Maki
達幸 牧
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Anritsu Corp
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Abstract

PROBLEM TO BE SOLVED: To measure light intensity of propagating light in a coated optical fiber by using leakage light of the coated optical fiber without referring to a table that depends on a coating diameter and coating material of the coated optical fiber.SOLUTION: An optical power meter includes two bending sections 11a and 11b where the coated optical fiber is bent at respective sections with curvature radiuses smaller than a leakage limitation radius and which cause light leakage of the propagating light L1 in a coated optical fiber at equal leakage rate at respective sections, a light measurement unit 12 for measuring the light intensity of the leakage light L1 from the bending sections 11a and 11b of the coated optical fiber 10 separately for two bending sections, and a computation unit 13 for calculating the light intensity of the propagating light in the coated optical fiber 10 by using the light intensity of the two sections measured by the light measurement unit 12.

Description

本発明は、光パワーメータ及び光パワー測定方法に関する。   The present invention relates to an optical power meter and an optical power measurement method.

局舎や屋外のクロージャなどの光ファイバが束となって集まっている場所で光ファイバ心線の工事を行う際、心線対照器を用いて工事の対象となる光ファイバ心線を特定する。心線対照器は、光ファイバ心線を挟むことにより曲げて、曲げた箇所からの光ファイバ心線の伝搬光を漏洩させることで、光ファイバ心線内の伝搬光の有無を検出することができる。現在、強度変調（例えば、２７０Ｈｚの矩形波）された信号を検出できるものや、光の方向を検出できるものが商品化されているが、心線対照器は光の有無は検出できても光ファイバ心線の伝搬光の絶対的な光強度を測定することはできない。このため、光ファイバ心線の伝搬光の絶対的な光強度を測定する際には、光の光強度を測定するための装置が別途必要であった。   When constructing an optical fiber core in a place where optical fibers such as a station building or an outdoor closure are gathered in a bundle, the optical fiber core to be constructed is specified using a core wire contrast device. The optical fiber contrast device is capable of detecting the presence or absence of propagating light in the optical fiber core wire by bending the optical fiber core wire and leaking the propagated light of the optical fiber core wire from the bent portion. it can. Currently, products that can detect intensity-modulated signals (for example, a 270 Hz rectangular wave) and those that can detect the direction of light have been commercialized. The absolute light intensity of the light propagating through the fiber core cannot be measured. For this reason, when measuring the absolute light intensity of the propagation light of the optical fiber core wire, a separate device for measuring the light intensity of the light is necessary.

そこで、光ファイバ心線の漏洩光を用いて光ファイバ心線の伝搬光の光強度を測定する装置が提案されている（例えば、特許文献１参照。）。特許文献１の装置は、光ファイバ心線の被覆径とそれに対応する補正量とが定められたテーブルを保有し、光ファイバ心線の被覆径を測定してテーブルを参照することで光ファイバ心線からの漏洩光の光強度の補正量を求め、光ファイバ心線の漏洩光の光強度を補正することで光ファイバ心線の伝搬光の光強度を測定する。   Therefore, an apparatus for measuring the light intensity of the propagation light of the optical fiber core using the leaked light of the optical fiber core has been proposed (see, for example, Patent Document 1). The apparatus of Patent Document 1 has a table in which a coating diameter of an optical fiber core and a correction amount corresponding thereto are determined, and the optical fiber core is measured by measuring the coating diameter of the optical fiber core and referring to the table. A correction amount of the light intensity of the leaked light from the wire is obtained, and the light intensity of the propagation light of the optical fiber core wire is measured by correcting the light intensity of the leaked light of the optical fiber core wire.

特開２００９−１４５４６号公報JP 2009-14546 A

ところが、光ファイバ心線からの漏洩光の光強度は光ファイバ心線の被覆材料によっても異なるため、テーブルを参照することにより求められる補正量が正しくない場合がある。このため、測定する光強度に誤差が生じることがある。   However, since the light intensity of the leaked light from the optical fiber core varies depending on the coating material of the optical fiber core, the correction amount required by referring to the table may not be correct. For this reason, an error may occur in the light intensity to be measured.

そこで、本発明は、光ファイバ心線の被覆径や被覆材料に依存するようなテーブルを参照することなく、光ファイバ心線の漏洩光を用いて光ファイバ心線の伝搬光の光強度を測定する光パワーメータ及び光パワー測定方法の提供を目的とする。   Therefore, the present invention measures the light intensity of the propagation light of the optical fiber core using the leaked light of the optical fiber core without referring to the table depending on the coating diameter or the coating material of the optical fiber core. An object of the present invention is to provide an optical power meter and an optical power measurement method.

上記目的を達成するために、本願発明の光パワーメータ及び光パワー測定方法は、光ファイバ心線の２箇所から等しい漏洩率で伝搬光を漏洩させることを特徴とする。図１に、本願発明の原理を示す。   In order to achieve the above object, the optical power meter and the optical power measurement method of the present invention are characterized in that the propagation light is leaked from the two locations of the optical fiber core wire with an equal leakage rate. FIG. 1 shows the principle of the present invention.

光強度Ｐ１の伝搬光が曲げ部１１ａにおいて漏洩率ηで漏洩されて光強度Ｐ２となり、さらに曲げ部１１ｂにおいて漏洩率ηで漏洩された場合、曲げ部１１ａ及び１１ｂで検出される漏洩光の光強度Ｐｍ１及びＰｍ２はそれぞれ、下記で現される。
Ｐｍ１＝η・Ｐ１ （１）
Ｐｍ２＝η・Ｐ２ （２）
ここで、Ｐ２＝Ｐ１−Ｐｍ１となるように光強度Ｐｍ１を検出すると、次式が成立する。
Ｐ１＝Ｐｍ１２／（Ｐｍ１−Ｐｍ２） （３） When the propagation light having the light intensity P1 is leaked at the bending portion 11a with the leakage rate η to become the light intensity P2, and further leaked at the bending portion 11b with the leakage rate η, the light of the leakage light detected by the bending portions 11a and 11b Intensities Pm1 and Pm2 are respectively expressed below.
Pm1 = η · P1 (1)
Pm2 = η · P2 (2)
Here, when the light intensity Pm1 is detected so that P2 = P1−Pm1, the following equation is established.
P1 = Pm1 2 / (Pm1-Pm2) (3)

このように、光ファイバ心線の２箇所から等しい漏洩率で伝搬光を漏洩させることで、漏洩率ηの影響を排除することができる。これにより、本願発明の光パワーメータ及び光パワー測定方法は、光ファイバ心線の被覆径や被覆材料に依存するようなテーブルを参照することなく、光ファイバ心線の漏洩光を用いて光ファイバ心線の伝搬光の光強度を測定することができる。   In this way, the influence of the leakage rate η can be eliminated by causing the propagation light to leak from the two locations of the optical fiber core wire with the same leakage rate. As a result, the optical power meter and the optical power measuring method of the present invention use an optical fiber using the leaked light of the optical fiber core without referring to a table depending on the coating diameter or the coating material of the optical fiber core. The light intensity of the propagation light of the core wire can be measured.

具体的には、本発明の光パワーメータは、漏洩限界半径を下回る曲率半径で光ファイバ心線を湾曲させ、等しい漏洩率で前記光ファイバ心線の伝搬光を漏洩させる２箇所の曲げ部（１１ａ及び１１ｂ）と、前記曲げ部の湾曲させた前記光ファイバ心線からの漏洩光の光強度を、前記２箇所のそれぞれ別個に測定する光測定部（１２）と、前記光測定部の測定した前記２箇所での光強度を用いて、前記光ファイバ心線の伝搬光の光強度を算出する演算部（１３）と、を備える。   Specifically, the optical power meter of the present invention bends the optical fiber core wire with a radius of curvature that is less than the leakage limit radius, and leaks the propagation light of the optical fiber core wire with an equal leakage rate ( 11a and 11b), a light measuring unit (12) for separately measuring the light intensity of leaked light from the optical fiber core wire bent by the bending unit, and measurement by the light measuring unit And an arithmetic unit (13) that calculates the light intensity of the propagation light of the optical fiber core wire using the light intensity at the two locations.

２箇所の曲げ部と、光測定部と、演算部と、を備えるため、前述の式（３）を用いて光ファイバ心線の伝搬光の光強度を測定することができる。これにより、本願発明の光パワーメータは、光ファイバ心線の被覆径や被覆材料に依存するようなテーブルを参照することなく、光ファイバ心線の漏洩光を用いて光ファイバ心線の伝搬光の光強度を測定することができる。   Since the two bending portions, the light measurement portion, and the calculation portion are provided, the light intensity of the propagation light of the optical fiber core wire can be measured using the above-described equation (3). As a result, the optical power meter of the present invention uses the leaked light of the optical fiber core to transmit the propagation light of the optical fiber without referring to the table depending on the coating diameter of the optical fiber and the coating material. Can be measured.

本発明の光パワーメータでは、前記２箇所の曲げ部は、等しい曲率半径で前記光ファイバ心線を湾曲させてもよい。
２箇所の曲げ部が光ファイバ心線を等しい曲率半径で湾曲させるため、等しい漏洩率で光ファイバ心線の伝搬光を漏洩させることができる。 In the optical power meter of the present invention, the two bending portions may bend the optical fiber core wire with an equal curvature radius.
Since the two bent portions bend the optical fiber core with the same radius of curvature, it is possible to leak the propagation light of the optical fiber core with the same leakage rate.

本発明の光パワーメータでは、前記光測定部は、前記光ファイバ心線を伝搬する片方向の伝搬光のみを測定してもよい。
光測定部が光ファイバ心線を伝搬する片方向の伝搬光のみを測定するため、２箇所の曲げ部と式（３）における光強度Ｐｍ１及びＰｍ２との関係を一義的に定めることができる。これにより、演算部における演算処理が簡易になるほか、伝搬光の伝搬方向を判定することができる。 In the optical power meter of the present invention, the light measurement unit may measure only one-way propagating light propagating through the optical fiber core wire.
Since the light measurement unit measures only one-way propagating light propagating through the optical fiber core wire, the relationship between the two bent portions and the light intensities Pm1 and Pm2 in Equation (3) can be uniquely determined. Thereby, the calculation process in the calculation unit is simplified, and the propagation direction of the propagation light can be determined.

本発明の光パワーメータでは、前記光測定部は、前記光ファイバ心線を一方の方向に伝搬する伝搬光と、前記光ファイバ心線を一方とは異なる方向に伝搬する伝搬光と、の両方向の伝搬光をそれぞれ測定してもよい。
本発明により、光パワーメータで光ファイバ心線を挟めば、伝搬光の伝搬方向に関りなく伝搬光の光強度を測定することができる。これにより、光パワーメータのユーザの作業を減らすことができる In the optical power meter of the present invention, the light measurement unit is configured to transmit the propagation light propagating through the optical fiber core in one direction and the propagation light propagating through the optical fiber core in a direction different from the one direction. Each of the propagation lights may be measured.
According to the present invention, if the optical fiber core wire is sandwiched between optical power meters, the light intensity of the propagation light can be measured regardless of the propagation direction of the propagation light. Thereby, the work of the user of the optical power meter can be reduced.

本発明の光パワーメータでは、前記２箇所での光強度のうちの大きな光強度を２乗し、前記２箇所での光強度の差分で除することによって、前記光ファイバ心線の伝搬光の光強度を算出してもよい。
本発明により、前述の式（３）を用いて光ファイバ心線の伝搬光の光強度を測定することができる。 In the optical power meter according to the present invention, the light intensity at the two locations is squared and divided by the difference between the light intensities at the two locations, so that the propagation light of the optical fiber core is reduced. The light intensity may be calculated.
According to the present invention, the light intensity of the propagation light of the optical fiber core wire can be measured using the above-described formula (3).

具体的には、本発明の光パワー測定方法は、漏洩限界半径を下回る曲率半径で光ファイバ心線の２箇所を湾曲させ、前記光ファイバ心線の２箇所から、等しい漏洩率で前記光ファイバ心線の伝搬光を漏洩させる曲げ手順（Ｓ１０１）と、前記曲げ手順で湾曲させた前記光ファイバ心線からの漏洩光の光強度を、前記２箇所のそれぞれ別個に測定する光測定手順（Ｓ１０２）と、前記光測定手順で測定した前記２箇所での光強度を用いて、前記光ファイバ心線の伝搬光の光強度を算出する演算手順（Ｓ１０３）と、を有する。   Specifically, in the optical power measurement method of the present invention, two locations of the optical fiber core are bent with a radius of curvature that is less than the leakage limit radius, and the optical fiber is equalized from the two locations of the optical fiber core with the same leak rate. A bending procedure (S101) for leaking the propagation light of the core wire, and a light measurement procedure (S102) for separately measuring the light intensity of the leaked light from the optical fiber core wire bent by the bending procedure. And a calculation procedure (S103) for calculating the light intensity of the propagation light of the optical fiber core wire using the light intensity at the two locations measured in the light measurement procedure.

曲げ手順と、光測定手順と、演算手順と、を有するため、前述の式（３）を用いて光ファイバ心線の伝搬光の光強度を測定することができる。これにより、本願発明の光パワー測定方法は、光ファイバ心線の被覆径や被覆材料に依存するようなテーブルを参照することなく、光ファイバ心線の漏洩光を用いて光ファイバ心線の伝搬光の光強度を測定することができる。   Since it has a bending procedure, a light measurement procedure, and a calculation procedure, the light intensity of the propagation light of the optical fiber core wire can be measured using the above-described equation (3). As a result, the optical power measurement method of the present invention uses the leaked light of the optical fiber core to propagate the optical fiber core without referring to a table that depends on the coating diameter or the coating material of the optical fiber core. The light intensity of light can be measured.

本発明の光パワー測定方法では、前記演算手順において、前記２箇所での光強度のうちの大きな光強度を２乗し、前記２箇所での光強度の差分で除することによって、前記光ファイバ心線の伝搬光の光強度を算出してもよい。
本発明により、前述の式（３）を用いて光ファイバ心線の伝搬光の光強度を測定することができる。 In the optical power measurement method of the present invention, in the calculation procedure, the optical fiber is obtained by squaring a large light intensity out of the light intensities at the two locations and dividing the result by the difference between the light intensities at the two locations. You may calculate the light intensity of the propagation light of a core wire.
According to the present invention, the light intensity of the propagation light of the optical fiber core wire can be measured using the above-described formula (3).

なお、上記各発明は、可能な限り組み合わせることができる。   The above inventions can be combined as much as possible.

本発明によれば、光ファイバ心線の被覆径や被覆材料に依存するようなテーブルを参照することなく、光ファイバ心線の漏洩光を用いて光ファイバ心線の伝搬光の光強度を測定する光パワーメータ及び光パワー測定方法を提供することができる。   According to the present invention, the light intensity of the propagation light of the optical fiber core is measured using the leaked light of the optical fiber core without referring to the table depending on the coating diameter or the coating material of the optical fiber core. An optical power meter and an optical power measurement method can be provided.

本願発明の原理を示す。The principle of the present invention will be described. 実施形態１に係る光パワーメータの一例を示す。An example of the optical power meter which concerns on Embodiment 1 is shown. 実施形態１に係る光パワー測定方法の一例を示す。An example of the optical power measuring method which concerns on Embodiment 1 is shown. 実施形態２に係る光パワーメータの一例を示す。An example of the optical power meter which concerns on Embodiment 2 is shown. 実施形態３に係る光パワーメータの一例を示す。An example of the optical power meter which concerns on Embodiment 3 is shown.

添付の図面を参照して本発明の実施形態を説明する。以下に説明する実施形態は本発明の実施の例であり、本発明は、以下の実施形態に制限されるものではない。なお、本明細書及び図面において符号が同じ構成要素は、相互に同一のものを示すものとする。   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 the present specification and drawings, the same reference numerals denote the same components.

（実施形態１）
図２に、実施形態１に係る光パワーメータの一例を示す。実施形態１に係る光パワーメータ１０１は、曲げ部１１ａと、曲げ部１１ｂと、光測定部１２と、演算部１３と、を備え、光ファイバ心線１０の一方から他方に伝搬する伝搬光Ｌ１の光強度を測定する。 (Embodiment 1)
FIG. 2 shows an example of an optical power meter according to the first embodiment. The optical power meter 101 according to the first embodiment includes a bending portion 11a, a bending portion 11b, an optical measurement unit 12, and a calculation unit 13, and propagates light L1 propagating from one of the optical fiber cores 10 to the other. Measure the light intensity.

図３に、実施形態１に係る光パワー測定方法の一例を示す。実施形態１に係る光パワー測定方法は、曲げ手順Ｓ１０１と、光測定手順Ｓ１０２と、演算手順Ｓ１０３と、を順に有する。以下、図２及び図３を参照しながら、各構成及び各手順の詳細について説明する。   FIG. 3 shows an example of an optical power measurement method according to the first embodiment. The optical power measurement method according to the first embodiment includes a bending procedure S101, a light measurement procedure S102, and a calculation procedure S103 in order. Hereinafter, the details of each configuration and each procedure will be described with reference to FIGS. 2 and 3.

曲げ手順Ｓ１０１では、曲げ部１１ａ及び曲げ部１１ｂを用いて光ファイバ心線１０の２箇所を湾曲させ、光ファイバ心線１０の２箇所から、等しい漏洩率で光ファイバ心線１０の伝搬光Ｌ１を漏洩させる。曲げ部１１ａ及び曲げ部１１ｂは、漏洩限界半径を下回る曲率半径で光ファイバ心線１０を湾曲させる。例えば、凸部３１ａ及び凸部３１ｂの局率半径は漏洩限界半径を下回っている。ここで、漏洩限界半径は、光ファイバ心線１０を曲げることによってファイバ心線１０から伝搬光が漏洩し始める半径である。凸部３１ａと凹部３２ａで光ファイバ心線１０を挟むことで、曲げ部１１ａにおいて漏洩限界半径よりも小さな半径に光ファイバ心線１０を曲げて伝搬光Ｌ１を漏洩させる。凸部３１ｂと凹部３２ｂで光ファイバ心線１０を挟むことで、曲げ部１１ｂにおいて漏洩限界半径よりも小さな半径に光ファイバ心線１０を曲げて伝搬光Ｌ１を漏洩させる。   In the bending procedure S101, two portions of the optical fiber core wire 10 are bent using the bending portion 11a and the bending portion 11b, and the propagation light L1 of the optical fiber core wire 10 is emitted from the two portions of the optical fiber core wire 10 with an equal leakage rate. Leak. The bent portion 11a and the bent portion 11b bend the optical fiber core wire 10 with a radius of curvature that is less than the leakage limit radius. For example, the locality radius of the convex portion 31a and the convex portion 31b is less than the leakage limit radius. Here, the leakage limit radius is a radius at which propagation light starts to leak from the fiber core wire 10 by bending the optical fiber core wire 10. By sandwiching the optical fiber core wire 10 between the convex portion 31a and the concave portion 32a, the optical fiber core wire 10 is bent to a radius smaller than the leakage limit radius at the bent portion 11a to leak the propagation light L1. By sandwiching the optical fiber core wire 10 between the convex portion 31b and the concave portion 32b, the optical fiber core wire 10 is bent to a radius smaller than the leakage limit radius at the bent portion 11b, and the propagation light L1 is leaked.

曲げ手順Ｓ１０１では、等しい漏洩率で光ファイバ心線１０の伝搬光Ｌ１を漏洩させるために、曲げ部１１ａ及び曲げ部１１ｂが等しい曲率半径で光ファイバ心線１０を湾曲させる。例えば、凸部３１ａと凸部３１ｂの局率半径が等しく、凹部３２ａと凹部３２ｂの局率半径が等しく、これにより曲げ部１１ａ及び曲げ部１１ｂでの漏洩率を等しくする。   In the bending procedure S101, in order to leak the propagation light L1 of the optical fiber core wire 10 with an equal leakage rate, the bent portion 11a and the bent portion 11b bend the optical fiber core wire 10 with an equal curvature radius. For example, the locality radii of the convex portion 31a and the convex portion 31b are equal, and the locality radii of the concave portion 32a and the concave portion 32b are equal, thereby making the leakage rates at the bent portion 11a and the bent portion 11b equal.

曲げ手順Ｓ１０１では、光ファイバ心線１０を同じ方向に湾曲させる。例えば、凸部３１ａ及び凸部３１ｂは曲げ部１１ａ及び１１ｂを構成する部材４１の同一面に形成され、凹部３２ａ及び凹部３２ｂは曲げ部１１ａ及び１１ｂを構成する部材４２の同一面に形成される。光ファイバ心線１０を同じ方向に湾曲させることで、光ファイバ心線１０の周方向の一部に光ファイバ心線１０の被覆の厚さや材料の異なる部分がある場合であっても、曲げ部１１ａ及び曲げ部１１ｂから等しい漏洩率で光ファイバ心線１０の伝搬光Ｌ１を漏洩させることができる。   In the bending procedure S101, the optical fiber core wire 10 is bent in the same direction. For example, the convex portion 31a and the convex portion 31b are formed on the same surface of the member 41 constituting the bent portions 11a and 11b, and the concave portion 32a and the concave portion 32b are formed on the same surface of the member 42 constituting the bent portions 11a and 11b. . By bending the optical fiber core wire 10 in the same direction, even if there is a part of the coating thickness or material of the optical fiber core wire 10 in a part of the circumferential direction of the optical fiber core wire 10, the bent portion The propagating light L1 of the optical fiber core wire 10 can be leaked from the optical fiber core 10 with the same leakage rate.

光測定手順Ｓ１０２では、光測定部１２を用いて、曲げ手順Ｓ１０１で湾曲させた光ファイバ心線１０からの漏洩光の光強度を、２箇所のそれぞれ別個に測定する。例えば、光測定部１２は、曲げ部１１ａにおける伝搬光Ｌ１の漏洩光を受光して図１に示す光強度Ｐｍ１を測定するＰＤ（Ｐｈｏｔｏ Ｄｉｏｄｅ）２１と、曲げ部１１ｂにおける伝搬光Ｌ１の漏洩光を受光して図１に示す光強度Ｐｍ２を測定するＰＤ２２と、を備える。   In the light measurement procedure S102, the light intensity of leakage light from the optical fiber core wire 10 bent in the bending procedure S101 is separately measured using the light measurement unit 12 at two locations. For example, the light measuring unit 12 receives the leakage light of the propagation light L1 in the bending part 11a and measures the light intensity Pm1 shown in FIG. 1 and the leakage light of the propagation light L1 in the bending part 11b. And PD 22 for measuring the light intensity Pm2 shown in FIG.

ここで、光測定部１２は、光ファイバ心線１０を伝搬する片方向の伝搬光Ｌ１のみを測定する。すなわち、光測定部１２は、光ファイバ心線１０の他方から一方に伝搬する伝搬光Ｌ２の漏洩光は測定しない。例えば、ＰＤ２１は凸部３１ａの先端よりも光ファイバ心線１０の他方側に配置され、ＰＤ２２は凸部３１ｂの先端よりも光ファイバ心線１０の他方側に配置される。このようにＰＤ２１及びＰＤ２２が伝搬光Ｌ１の漏洩光のみを受光するため、ＰＤ２１で受光される漏洩光の光強度がＰＤ２２で受光される漏洩光の光強度よりも必ず大きくなる。このため、ＰＤ２１の出力を光強度Ｐｍ１にＰＤ２２の出力を光強度Ｐｍ２に一義的に定めることができるため、演算部１３における演算処理を簡易にするとともに、光パワーメータ１０１のユーザの操作を容易にすることができる。また、伝搬光の伝搬方向を簡易に判定することもできる。   Here, the light measurement unit 12 measures only the unidirectional propagation light L1 propagating through the optical fiber core wire 10. That is, the light measurement unit 12 does not measure the leakage light of the propagation light L2 propagating from the other optical fiber core wire 10 to the other. For example, the PD 21 is disposed on the other side of the optical fiber core 10 with respect to the tip of the convex portion 31a, and the PD 22 is disposed on the other side of the optical fiber core wire 10 with respect to the front end of the convex portion 31b. Since the PD 21 and the PD 22 receive only the leakage light of the propagation light L1 in this way, the light intensity of the leakage light received by the PD 21 is necessarily greater than the light intensity of the leakage light received by the PD 22. Therefore, the output of the PD 21 can be uniquely determined as the light intensity Pm1 and the output of the PD 22 can be uniquely determined as the light intensity Pm2. Therefore, the calculation processing in the calculation unit 13 is simplified and the user can easily operate the optical power meter 101. Can be. In addition, the propagation direction of the propagation light can be easily determined.

演算手順Ｓ１０３では、演算部１３を用いて、光測定手順Ｓ１０２で測定した２箇所での漏洩光の光強度Ｐｍ１及びＰｍ２を用いて、光ファイバ心線１０の伝搬光Ｌ１の光強度を算出する。たとえば、前述の式（３）を用い、２箇所での光強度のうちの大きな光強度を２乗し、２箇所での光強度の差分で除することによって、伝搬光Ｌ１の光強度Ｐ１を算出する。   In the calculation procedure S103, the light intensity of the propagation light L1 of the optical fiber core wire 10 is calculated using the light intensity Pm1 and Pm2 of the leaked light at two locations measured in the light measurement procedure S102 using the calculation unit 13. . For example, the light intensity P1 of the propagation light L1 is obtained by squaring the large light intensity of the light intensity at the two places and dividing by the difference between the light intensities at the two places using the above-described equation (3). calculate.

ここで、前述の式（３）を用いるために、Ｐ２＝Ｐ１−Ｐｍ１となるように光強度Ｐｍ１を検出する。そこで、ＰＤ２１はＰＤ２２よりも光ファイバ心線１０の一方側に配置されるとともに、ＰＤ１が曲げ部１１ａでの漏洩光の全てを受光できる受光面積を有している。これにより、前述の式（３）が成立し、伝搬光Ｌ１の光強度を測定することができる。   Here, in order to use the above-described equation (3), the light intensity Pm1 is detected so that P2 = P1−Pm1. Therefore, the PD 21 is arranged on one side of the optical fiber core wire 10 with respect to the PD 22 and has a light receiving area where the PD 1 can receive all of the leaked light at the bent portion 11a. Thereby, the above-described equation (3) is established, and the light intensity of the propagation light L1 can be measured.

（実施形態２）
図４に、実施形態２に係る光パワーメータの一例を示す。実施形態２に係る光パワーメータ１０２は、実施形態１で説明した曲げ手順Ｓ１０１における曲げ部１１ａ及び曲げ部１１ｂの構成が異なる。 (Embodiment 2)
FIG. 4 shows an example of an optical power meter according to the second embodiment. The optical power meter 102 according to the second embodiment is different in the configuration of the bending portion 11a and the bending portion 11b in the bending procedure S101 described in the first embodiment.

実施形態２に係る曲げ手順Ｓ１０１では、光ファイバ心線１０を異なる方向に湾曲させる。例えば、凸部３１ａ及び凹部３２ｂが曲げ部１１ａ及び１１ｂを構成する部材４３の同一面に形成され、凸部３１ｂ及び凹部３２ａが曲げ部１１ａ及び１１ｂを構成する部材４４の同一面に形成される。これにより、曲げ部１１ａと曲げ部１１ｂの間隔を狭くすることができるため、光パワーメータ１０２を小型化することができる。   In the bending procedure S101 according to the second embodiment, the optical fiber core wire 10 is bent in different directions. For example, the convex portion 31a and the concave portion 32b are formed on the same surface of the member 43 constituting the bent portions 11a and 11b, and the convex portion 31b and the concave portion 32a are formed on the same surface of the member 44 constituting the bent portions 11a and 11b. . Thereby, since the space | interval of the bending part 11a and the bending part 11b can be narrowed, the optical power meter 102 can be reduced in size.

（実施形態３）
図５に、実施形態３に係る光パワーメータの一例を示す。実施形態３に係る光パワーメータ１０３は、実施形態１で説明した光測定手順Ｓ１０２における光測定部１２の構成が異なる。 (Embodiment 3)
FIG. 5 shows an example of an optical power meter according to the third embodiment. The optical power meter 103 according to the third embodiment is different in the configuration of the light measurement unit 12 in the light measurement procedure S102 described in the first embodiment.

実施形態３に係る光測定手順Ｓ１０２では、光測定部１２は、伝搬光Ｌ１と伝搬光Ｌ２との両方向の伝搬光をそれぞれ測定する。例えば、光測定部１２は、実施形態１で説明したＰＤ２１及びＰＤ２２に加えて、ＰＤ２３及びＰＤ２４を備える。ＰＤ２１及びＰＤ２２は伝搬光Ｌ１の漏洩光のみが入射する位置に配置され、ＰＤ２３及びＰＤ２４は伝搬光Ｌ２の漏洩光のみが入射する位置に配置されている。   In the light measurement procedure S102 according to the third embodiment, the light measurement unit 12 measures the propagation light in both directions of the propagation light L1 and the propagation light L2. For example, the light measurement unit 12 includes a PD 23 and a PD 24 in addition to the PD 21 and the PD 22 described in the first embodiment. PD21 and PD22 are arranged at a position where only the leakage light of the propagation light L1 is incident, and PD23 and PD24 are arranged at a position where only the leakage light of the propagation light L2 is incident.

光パワーメータ１０３に伝搬光Ｌ１が入力された場合には、演算部１３は、ＰＤ２１及びＰＤ２２で検出された漏洩光の光強度を用いて伝搬光Ｌ１の光強度を算出する。光パワーメータ１０３に伝搬光Ｌ２が入力された場合には、演算部１３は、ＰＤ２３及びＰＤ２４で検出された漏洩光の光強度を用いて伝搬光Ｌ１の光強度を算出する。ＰＤ２３は曲げ部１１ｂにおける伝搬光Ｌ２の漏洩光を受光して図１に示す光強度Ｐｍ１を測定し、ＰＤ２４は曲げ部１１ａにおける伝搬光Ｌ２の漏洩光を受光して図１に示す光強度Ｐｍ２を測定する。   When the propagation light L1 is input to the optical power meter 103, the calculation unit 13 calculates the light intensity of the propagation light L1 using the light intensity of the leakage light detected by the PD 21 and PD22. When the propagation light L2 is input to the optical power meter 103, the calculation unit 13 calculates the light intensity of the propagation light L1 using the light intensity of the leakage light detected by the PD 23 and the PD 24. The PD 23 receives the leakage light of the propagation light L2 at the bending portion 11b and measures the light intensity Pm1 shown in FIG. 1, and the PD 24 receives the leakage light of the propagation light L2 at the bending portion 11a and receives the light intensity Pm2 shown in FIG. Measure.

光パワーメータ１０３は、伝搬光Ｌ１及び伝搬光Ｌ２の両方向の漏洩光の光強度を測定することができるため、束ねてある光ファイバ心線であっても、伝搬光の伝搬方向を確認することなく伝搬光の光強度を測定することができる。これにより、光パワーメータのユーザの作業を減らすことができる   Since the optical power meter 103 can measure the light intensity of the leakage light in both directions of the propagation light L1 and the propagation light L2, the propagation direction of the propagation light can be confirmed even for the bundled optical fiber core wires. It is possible to measure the light intensity of propagating light. Thereby, the work of the user of the optical power meter can be reduced.

また、ＰＤ２１及びＰＤ２２で漏洩光が検出された場合には光ファイバ心線１０の一方から他方に伝搬する伝搬光Ｌ１であり、ＰＤ２３及びＰＤ２４で漏洩光が検出された場合には光ファイバ心線１０の他方から一方に伝搬する伝搬光Ｌ２であることが判別できるため、伝搬光の伝搬方向も判別することができる。   Further, when leakage light is detected by PD 21 and PD 22, it is propagation light L 1 propagating from one of the optical fiber cores 10 to the other. When leakage light is detected by PD 23 and PD 24, the optical fiber core wire is used. Since it can be determined that the propagation light L2 propagates from the other of the ten to one, the propagation direction of the propagation light can also be determined.

本発明の光パワーメータ及び光パワー測定方法は、情報通信産業に適用することができる。   The optical power meter and the optical power measurement method of the present invention can be applied to the information communication industry.

１０：光ファイバ心線
１１ａ、１１ｂ：曲げ部
１２：光測定部
１３：演算部
２１、２２、２３、２４：ＰＤ
３１ａ、３１ｂ：凸部
３２ａ、３２ｂ：凹部
４１、４２、４３、４４：曲げ部を構成する部材
１０１、１０２、１０３：光パワーメータ 10: Optical fiber core wire 11a, 11b: Bending part 12: Light measuring part 13: Calculation parts 21, 22, 23, 24: PD
31a, 31b: convex portions 32a, 32b: concave portions 41, 42, 43, 44: members 101, 102, 103 constituting the bent portion: optical power meter

Claims (7)

漏洩限界半径を下回る曲率半径で光ファイバ心線を湾曲させ、等しい漏洩率で前記光ファイバ心線の伝搬光を漏洩させる２箇所の曲げ部（１１ａ及び１１ｂ）と、
前記曲げ部の湾曲させた前記光ファイバ心線からの漏洩光の光強度を、前記２箇所のそれぞれ別個に測定する光測定部（１２）と、
前記光測定部の測定した前記２箇所での光強度を用いて、前記光ファイバ心線の伝搬光の光強度を算出する演算部（１３）と、
を備える光パワーメータ。 Two bends (11a and 11b) that bend the optical fiber core with a radius of curvature less than the leakage limit radius and leak the propagation light of the optical fiber core with an equal leakage rate;
A light measuring section (12) for separately measuring the light intensity of leaked light from the optical fiber core wire bent by the bending section; and
A calculation unit (13) that calculates the light intensity of the propagation light of the optical fiber core wire using the light intensity at the two locations measured by the light measurement unit;
An optical power meter comprising: 前記２箇所の曲げ部は、等しい曲率半径で前記光ファイバ心線を湾曲させることを特徴とする請求項１に記載の光パワーメータ。   The optical power meter according to claim 1, wherein the two bent portions bend the optical fiber core wire with an equal radius of curvature. 前記光測定部は、前記光ファイバ心線を伝搬する片方向の伝搬光のみを測定することを特徴とする請求項１又は２に記載の光パワーメータ。   The optical power meter according to claim 1, wherein the light measuring unit measures only unidirectionally propagated light propagating through the optical fiber core wire. 前記光測定部は、前記光ファイバ心線を一方の方向に伝搬する伝搬光と、前記光ファイバ心線を一方とは異なる方向に伝搬する伝搬光と、の両方向の伝搬光をそれぞれ測定することを特徴とする請求項１又は２に記載の光パワーメータ。   The light measurement unit measures the propagation light in both directions of the propagation light propagating through the optical fiber core in one direction and the propagation light propagating through the optical fiber core in a direction different from the one. The optical power meter according to claim 1 or 2. 前記２箇所での光強度のうちの大きな光強度を２乗し、前記２箇所での光強度の差分で除することによって、前記光ファイバ心線の伝搬光の光強度を算出することを特徴とする請求項１から４のいずれかに記載の光パワーメータ。   The light intensity of the propagation light of the optical fiber core wire is calculated by squaring the large light intensity of the light intensity at the two places and dividing by the difference of the light intensity at the two places. An optical power meter according to any one of claims 1 to 4. 漏洩限界半径を下回る曲率半径で光ファイバ心線の２箇所を湾曲させ、前記光ファイバ心線の２箇所から、等しい漏洩率で前記光ファイバ心線の伝搬光を漏洩させる曲げ手順（Ｓ１０１）と、
前記曲げ手順で湾曲させた前記光ファイバ心線からの漏洩光の光強度を、前記２箇所のそれぞれ別個に測定する光測定手順（Ｓ１０２）と、
前記光測定手順で測定した前記２箇所での光強度を用いて、前記光ファイバ心線の伝搬光の光強度を算出する演算手順（Ｓ１０３）と、
を有する光パワー測定方法。 A bending procedure (S101) in which two portions of the optical fiber core are bent with a radius of curvature lower than a leakage limit radius, and the propagation light of the optical fiber core is leaked from the two portions of the optical fiber core with an equal leakage rate; ,
A light measurement procedure (S102) for separately measuring the light intensity of leaked light from the optical fiber core bent by the bending procedure, at each of the two locations;
A calculation procedure for calculating the light intensity of the propagation light of the optical fiber core using the light intensity at the two locations measured in the light measurement procedure (S103),
A method for measuring optical power. 前記演算手順において、前記２箇所での光強度のうちの大きな光強度を２乗し、前記２箇所での光強度の差分で除することによって、前記光ファイバ心線の伝搬光の光強度を算出することを特徴とする請求項６に記載の光パワー測定方法。   In the calculation procedure, the light intensity of the propagation light of the optical fiber core wire is calculated by squaring the large light intensity of the light intensity at the two places and dividing by the difference of the light intensity at the two places. The optical power measurement method according to claim 6, wherein calculation is performed.
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