JPH0653907A - Fiber matching method for branch type optical path - Google Patents
Fiber matching method for branch type optical pathInfo
- Publication number
- JPH0653907A JPH0653907A JP4205623A JP20562392A JPH0653907A JP H0653907 A JPH0653907 A JP H0653907A JP 4205623 A JP4205623 A JP 4205623A JP 20562392 A JP20562392 A JP 20562392A JP H0653907 A JPH0653907 A JP H0653907A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- fiber
- light
- optical fiber
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、分岐型光線路におい
て、ケーブル移転やケーブル修理時に光ファイバ心線を
切断して接続替えを行う必要が生じた場合、作業現場で
該当心線かどうかを簡便に検知し得る分岐型光線路の心
線対照方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch type optical line, and when it is necessary to cut the optical fiber core and change the connection at the time of cable transfer or cable repair, it is necessary to check whether the optical fiber is the corresponding core wire at the work site. The present invention relates to a method for checking a core line of a branch type optical line that can be easily detected.
【０００２】[0002]
【従来の技術】図６に映像分配サービス等を提供できる
分岐型光線路の構成を示す。図において、１は光送信
器、２は幹線の光ファイバ、２−ｎは分岐部の光ファイ
バ心線、３−ｎは光受信器、２０は光分配器である。図
６において、光分配器２０と光受信器３との間の線路に
おける光ファイバ心線２−１〜２−ｎの心線対照を行う
場合、例えば、作業者は光受信器３−１に接続されてい
る光ファイバ心線２−１のコネクタをはずし、そこに心
線対照用光源を接続し、他の作業者が曲げ放射光を利用
した心線対照光検出器により、マンホール等の作業現場
で該光心線２−１を確認する方法を行っていた。2. Description of the Related Art FIG. 6 shows a structure of a branch type optical line capable of providing a video distribution service and the like. In the figure, 1 is an optical transmitter, 2 is a trunk optical fiber, 2-n is a branch optical fiber core wire, 3-n is an optical receiver, and 20 is an optical distributor. In FIG. 6, in the case where the optical fiber cores 2-1 to 2-n in the line between the optical distributor 20 and the optical receiver 3 are compared with each other, for example, an operator uses the optical receiver 3-1. Remove the connector of the connected optical fiber core wire 2-1 and connect the light source for the core wire contrast to it, and another worker uses the core wire contrast photodetector that uses bending radiation to perform work such as manholes. The method of confirming the optical fiber line 2-1 was performed on the spot.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上述した従
来の方法では、作業者がユーザ宅へ行き、光受信器の光
コネクタをはずして、心線対照光を挿入しなければなら
ず、また、通信も同時に止める必要があるため、作業の
自動化、サービス性の維持が困難になるという問題を生
じた。By the way, in the above-mentioned conventional method, the worker must go to the user's house, disconnect the optical connector of the optical receiver, and insert the optical fiber for contrasting the optical fiber. Since it is necessary to stop communication at the same time, it has become difficult to automate work and maintain serviceability.
【０００４】この発明は上述した事情に鑑みてなされた
もので、光線路の分岐部分の心線対照を、サービスの中
断なく、簡便に、かつ経済的に行うことができる分岐型
光線路の心線対照方法を提供することを目的としてい
る。The present invention has been made in view of the above-mentioned circumstances, and the core of the branch type optical line can be simply and economically compared without interrupting the service, for the core line comparison of the branch part of the optical line. It is intended to provide a line contrast method.
【０００５】[0005]
【課題を解決するための手段】上述した問題点を解決す
るために、本願発明では、光線路の途中に光分岐器を設
け、該分岐器によって分岐された光線路の加入者側に設
けられた各光受信器の直前に光フィルタ型反射器を各々
設置し、光パルス試験器から通信光と異なる波長の試験
パルス光を局内側に設置した光カプラを介して前記光線
路に挿入し、前記各光受信器の直前に各々設置した前記
試験パルス光のみを反射させる光フィルタ型反射器によ
る前記試験パルス光の各反射光について、その光レベル
及び位置を各々検知し、正常な状態時の前記光線路およ
び分岐された各光線路について予め測定した前記各反射
光の光レベル及び位置と該当光ファイバ心線に対し心線
対照治具により曲げ損を与えた場合の前記各反射光の光
レベル及び位置とを比較し、比較の結果、該当心線の位
置の光レベルに変動が生じている場合には、該当心線で
あると判定し、変動が生じていない場合は該当心線でな
いと判定することにより、前記分岐部分を有する光線路
の心線対照を行うことを特徴とする。In order to solve the above-mentioned problems, in the present invention, an optical branching device is provided in the middle of the optical line, and the optical branching device is provided on the subscriber side of the optical line. The optical filter type reflector is installed immediately before each optical receiver, and the test pulse light having a wavelength different from the communication light is inserted into the optical line from the optical pulse tester through the optical coupler installed inside the station. For each reflected light of the test pulse light by the optical filter type reflector that reflects only the test pulse light installed immediately before each of the optical receivers, its optical level and position are respectively detected, and in a normal state Light level and position of each reflected light previously measured for the optical line and each branched optical line, and light of each reflected light when a bending loss is given to the corresponding optical fiber core wire by a core wire comparison jig Level and position As a result of the comparison, as a result of the comparison, if the light level at the position of the corresponding core line has changed, it is determined to be the corresponding core line, and if there is no change, it is determined to be not the corresponding core line. The optical fiber having the branched portion is compared with the optical fiber.
【０００６】[0006]
【作用】上記構成によれば、光線路の分岐部分の心線対
照が該当心線に一定の曲げ損を与えるだけで自動的にで
きるため、通信の中断や作業者のユーザ宅への派遣等が
なくなり、サービス性向上、省力化、経済化が図れる。According to the above construction, since the optical fiber can be automatically compared with the optical fiber at the branch portion of the optical fiber line by giving a certain bending loss to the optical fiber, the communication is interrupted and the worker is dispatched to the user's house. It is possible to improve serviceability, save labor, and make economy.
【０００７】[0007]
【実施例】次に図面を参照してこの発明の実施例につい
て説明する。図１はこの発明の一実施例の構成を示すブ
ロック図である。 （実施例）図において、１０は光カプラ、６は光パルス
試験器、１２は光パルス試験器６を制御するＣＰＵ（中
央処理装置）、１３は各種データを記憶するデータベー
ス、２１はモデム、２２は公衆回線、２３はポータブル
型コンピュータ、２４は光ファイバに曲げ損を与える治
具、１1−１，１１−２，……，１１−ｎは光フィルタ
型反射器、１９はこの光フィルタ型反射器から反射され
た光を阻止する光フィルタである。Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. (Embodiment) In the figure, 10 is an optical coupler, 6 is an optical pulse tester, 12 is a CPU (central processing unit) for controlling the optical pulse tester 6, 13 is a database for storing various data, 21 is a modem, 22 Is a public line, 23 is a portable computer, 24 is a jig for giving bending loss to the optical fiber, 11-1, 11-2, ..., 11-n are optical filter type reflectors, 19 is this optical filter type reflection It is an optical filter that blocks the light reflected from the container.
【０００８】各加入者宅に設置される光受信器３−１，
３−２，……，３−ｎと光分配器２０との間の距離は、
一般に、各々異なると考えられるため、正常時に光パル
ス試験器６で各光フィルタ型反射器１１−１，１１−
２，……，１１−ｎの反射レベル及び位置を各々測定し
た場合、図２に示す結果が得られる。ここで、横軸は光
パルス試験器６から反射位置までの距離、縦軸は反射レ
ベル、lsは光分配器２０の位置である。光パルス試験器
６から反射位置までの距離をl1，l2，……，lm（l1＜l2
＜……＜lm）とし、対応する反射レベルをｙ1，ｙ2，…
…，ｙmとすると、距離l1，l2，……，lmには、光分配
器２０からの距離が短い順に、光フィルタ型切分け器１
１−１，１１−２，……，１１−ｎが各々対応する。例
えば、反射レベルｙ1は、光分配器２０から最も近距離
の加入者に設置されている光フィルタ型反射器からの反
射であることが分かり、反射レベルｙmは、光分配器２
０からの距離が（短い方から数えて）第ｍ番目の加入者
に設置されている光フィルタ型反射器からの反射である
ことがわかる。An optical receiver 3-1 installed in each subscriber's house
3-2, ..., 3-n and the distance between the optical distributor 20 are
In general, since it is considered that they are different from each other, each of the optical filter type reflectors 11-1, 11-
When the reflection levels and positions of 2, ..., 11-n are measured, the results shown in FIG. 2 are obtained. Here, the horizontal axis is the distance from the optical pulse tester 6 to the reflection position, the vertical axis is the reflection level, and ls is the position of the light distributor 20. The distance from the optical pulse tester 6 to the reflection position is l 1 , l 2 , ..., L m (l 1 <l 2
<... <l m ) and the corresponding reflection levels are y 1 , y 2 , ...
..., When y m, distance l 1, l 2, ......, the l m, in order short distance from the optical distributor 20, the optical filter type switching divided unit 1
1-1, 11-2, ..., 11-n correspond to each other. For example, the reflection level y 1, it found a reflection from the optical filter type reflector is installed in the closest distance of the subscriber from the light distributor 20, the reflection level y m, the optical distributor 2
It can be seen that the distance from 0 (counting from the shortest) is the reflection from the optical filter reflector installed at the mth subscriber.
【０００９】図３は、（光分配器２０に２番目に近い加
入者を結ぶ）分岐ファイバ２−２に心線対照治具で曲げ
損を与えて、心線対照した場合の光パルス試験器６によ
る反射量の測定結果を示している。この図に示すよう
に、距離l2での反射レベルｙ2が曲げ損の２倍分小さく
なり、ｙ2’となった結果が測定されている。従って、
この図から、分岐ファイバ２−２が心線対照されたこと
がわかる。この場合、もし、誤って分岐ファイバ２−２
以外の心線を心線対照した場合には、距離l2における反
射量はｙ2となり、変化がないので該当心線でなく、他
の心線であることがわかる。FIG. 3 shows an optical pulse tester in the case of performing a core fiber comparison by giving a bending loss to the branch fiber 2-2 (connecting the subscriber closest to the optical distributor 20) with a core fiber comparison jig. 6 shows the measurement result of the reflection amount according to No. 6. As shown in this figure, the reflection level y 2 is decreased by twice the bending loss at a distance l 2, a result of a y 2 'is measured. Therefore,
From this figure, it can be seen that the branch fiber 2-2 was subjected to the core wire contrast. In this case, if the branch fiber 2-2
When the cords other than the above are compared with the cords, the reflection amount at the distance l 2 is y 2 , and there is no change, so it is understood that the cords are not the corresponding cords but the other cords.
【００１０】ここで、図４に光フィルタ型反射器１１の
構成例を示しており、これは、光フィルタ１４、光ファ
イバ１７、コード部１８、補強部１５からなり、光フィ
ルタ１４は光ファイバ１７に対してθの傾きで挿入して
ある。この傾きを適当に選定することにより、通信光λ
0を通過させ、試験光λtを反射して光パルス試験器６の
方向へ戻るようにしたものである。Here, FIG. 4 shows an example of the structure of the optical filter type reflector 11, which comprises an optical filter 14, an optical fiber 17, a cord portion 18, and a reinforcing portion 15. The optical filter 14 is an optical fiber. It is inserted at an inclination of θ with respect to 17. By properly selecting this inclination, the communication light λ
It passes 0 , reflects the test light λt, and returns to the direction of the optical pulse tester 6.
【００１１】次に、この例の動作について、図５のフロ
ーチャートを参照して説明する。作業現場からポータブ
ルコンピュータ２３の指示により、光パルス試験器を動
作させ、各加入者の光受信器の前にある光フィルタ型反
射器の反射レベルと位置とを測定する（ステップＳＢ
１）。次に、作業現場において、曲げ損治具２４によ
り、該当心線に曲げ損を与える。この曲げは通信光λ0
には影響がなく、試験光λtには十分損失を与える範囲
のものである（ステップＳＢ２）。次に、光パルス試験
を行い、光フィルタ反射器の反射レベルと位置とを測定
し、ステップＳＢ１で測定したものと比較する（ステッ
プＳＢ３）。Next, the operation of this example will be described with reference to the flowchart of FIG. According to the instruction from the portable computer 23 from the work site, the optical pulse tester is operated to measure the reflection level and position of the optical filter type reflector in front of the optical receiver of each subscriber (step SB).
1). Next, at the work site, the bending loss jig 24 gives a bending loss to the corresponding core wire. This bending is due to the communication light λ 0
Is not affected and the test light λt is sufficiently lost (step SB2). Next, an optical pulse test is performed to measure the reflection level and position of the optical filter reflector and compare them with those measured in step SB1 (step SB3).
【００１２】次に、ステップＳＢ４において、ＣＰＵ１
２は、該当心線の反射レベルがしきい値分小さくなった
か否かを判断する（ステップＳＢ４）。 （イ）ステップＳＢ４において「ＹＥＳ」と判断された
時 ステップＳＢ４において、「ＹＥＳ」と判断されれば、
すなわち、反射レベルに差が生じていれば、ステップＳ
Ｂ５へ進み、作業現場の心線は真に該当心線であると判
定し、ステップＳＢ７へ進む。ステップＳＢ７では、こ
の結果を作業者のポータブルコンピュータ２３へ送信し
知らせる。 （ロ）ステップＳＢ４において「ＮＯ」と判断された時 ステップＳＢ４において、「ＮＯ」と判断されれば、す
なわち、反射レベルに差が生じていなければ、ステップ
ＳＢ６へ進み、作業現場の心線は該当心線でないと判断
し、ステップＳＢ７へ進む。ステップＳＢ７では、この
結果をポータブルコンピュータ２３へ送信し、作業者へ
知らせる。Next, in step SB4, the CPU 1
2 determines whether or not the reflection level of the corresponding cord has decreased by the threshold value (step SB4). (A) When “YES” is determined in step SB4 If “YES” is determined in step SB4,
That is, if there is a difference in reflection level, step S
The process proceeds to B5, where it is determined that the core wire of the work site is truly the core wire, and the process proceeds to step SB7. In step SB7, the result is transmitted to the worker's portable computer 23 to inform it. (B) When "NO" is determined in step SB4 If "NO" is determined in step SB4, that is, if there is no difference in reflection level, the process proceeds to step SB6, It is determined that it is not the corresponding core line, and the process proceeds to step SB7. In step SB7, this result is transmitted to the portable computer 23 to notify the operator.
【００１３】[0013]
【発明の効果】以上、説明したように、この発明によれ
ば、光線路の途中に光分岐器を設け、該分岐器によって
分岐された光線路の加入者側に設けられた各光受信器の
直前に光フィルタ型反射器を各々設置し、光パルス試験
器から通信光と異なる波長の試験パルス光を局内側に設
置した光カプラを介して前記光線路に挿入し、前記各光
受信器の直前に各々設置した前記試験パルス光のみを反
射させる光フィルタ型反射器による前記試験パルス光の
各反射光について、その光レベル及び位置を各々検知
し、検知した当該光レベル及び位置を、正常な状態時の
前記光線路および分岐された各光線路について予め測定
した前記各反射光の光レベル及び位置と該当光ファイバ
心線に対し心線対照治具により曲げ損を与えた場合の前
記各反射光の光レベル及び位置とを比較し、比較の結
果、該当心線の位置の光レベルに変動が生じている場合
には、該当心線であると判定し、変動が生じていない場
合は該当心線でないと判定することにより、前記分岐部
分を有する光線路の心線対照を行うようにしたため、分
岐型光線路の心線対照を自動化でき、かつ、通信を中断
することなく実施できるため、工事作業の効率化、サー
ビス性の大幅な向上を図れるという利点が得られる。As described above, according to the present invention, an optical branching device is provided in the middle of the optical line, and each optical receiver is provided on the subscriber side of the optical line branched by the branching device. , Each optical filter type reflector is installed immediately before, and the test pulse light of a wavelength different from the communication light from the optical pulse tester is inserted into the optical line through the optical coupler installed inside the station, and each optical receiver is For each reflected light of the test pulse light by the optical filter type reflector that reflects only the test pulse light installed immediately before, the light level and position are respectively detected, and the detected light level and position are The optical level and position of each reflected light measured in advance for each of the optical lines and the branched optical lines in such a state, and each of the cases where a bending loss is given to the corresponding optical fiber core wire by a core wire comparison jig Light level of reflected light And the position, and as a result of the comparison, if the light level at the position of the applicable core changes, it is determined to be the applicable core, and if there is no change, it is not the applicable core. Since the core line comparison of the optical line having the branch portion is performed by the judgment, the core line comparison of the branch type optical line can be automated and can be performed without interruption of communication, thus improving the work efficiency. It is possible to obtain the advantage that it is possible to significantly improve the serviceability and serviceability.
【図１】本発明の一実施例の構成を示すブロック図であ
る。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
【図２】分岐型光線路に光フィルタ型反射器を設置した
場合の光パルス試験結果を示す特性図である。FIG. 2 is a characteristic diagram showing an optical pulse test result when an optical filter type reflector is installed in a branch type optical line.
【図３】心線対照を行った場合の光パルス試験の結果を
示す特性図である。FIG. 3 is a characteristic diagram showing a result of an optical pulse test when a core wire control is performed.
【図４】光フィルタ型反射器の一構成例を示す模式図で
ある。FIG. 4 is a schematic view showing a configuration example of an optical filter type reflector.
【図５】本発明による分岐型光線路の心線対照の手順を
示すフローチャートである。FIG. 5 is a flow chart showing a procedure of arranging a core of a branched optical line according to the present invention.
【図６】従来の技術を説明するためのブロック図であ
る。FIG. 6 is a block diagram for explaining a conventional technique.
１ 光送信器 ２ 光ファイバ（光線路） ２−１〜２−ｎ 分岐ファイバ（光線路） ３−１〜３−ｎ 光受信器 ４ａ 光フィルタ ４ｂ 光フィルタ ６ 光パルス試験器 １０ 光カプラ １１ 光フィルタ型反射器 １２ ＣＰＵ １３ データベース １５ 補強部 １４ 光フィルタ １７ 光ファイバ １８ コード部 １９ 光フィルタ ２０ 光分配器（スターカプラ、光分岐器） ２１ モデム ２２ 公衆回線 ２３ ポータブルコンピュータ ２４ 曲げ損治具 λ0 通信光 λ1 試験パルス光1 Optical transmitter 2 Optical fiber (optical line) 2-1 to 2-n Branch fiber (optical line) 3-1 to 3-n Optical receiver 4a Optical filter 4b Optical filter 6 Optical pulse tester 10 Optical coupler 11 Optical Filter type reflector 12 CPU 13 Database 15 Reinforcement part 14 Optical filter 17 Optical fiber 18 Code part 19 Optical filter 20 Optical distributor (star coupler, optical branching device) 21 Modem 22 Public line 23 Portable computer 24 Bending loss jig λ 0 Communication light λ 1 Test pulse light
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０２Ｂ 6/00 ３３６ 6920−2Ｋ Ｈ０４Ｍ 1/24 Ｈ 9077−5Ｋ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI Technical display location G02B 6/00 336 6920-2K H04M 1/24 H 9077-5K
Claims (1)
器によって分岐された光線路の加入者側に設けられた各
光受信器の直前に光フィルタ型反射器を各々設置し、光
パルス試験器から通信光と異なる波長の試験パルス光を
局内側に設置した光カプラを介して前記光線路に挿入
し、前記各光受信器の直前に各々設置した前記試験パル
ス光のみを反射させる光フィルタ型反射器による前記試
験パルス光の各反射光について、その光レベル及び位置
を各々検知し、正常な状態時の前記光線路および分岐さ
れた各光線路について予め測定した前記各反射光の光レ
ベル及び位置と該当光ファイバ心線に対し心線対照治具
により曲げ損を与えた場合の前記各反射光の光レベル及
び位置とを比較し、比較の結果、該当心線の位置の光レ
ベルに変動が生じている場合には、該当心線であると判
定し、変動が生じていない場合は該当心線でないと判定
することにより、前記分岐部分を有する光線路の心線対
照を行うことを特徴とする分岐型光線路の心線対照方
法。1. An optical branching device is provided in the middle of the optical line, and an optical filter type reflector is installed in front of each optical receiver provided on the subscriber side of the optical line branched by the branching device. Insert a test pulse light with a wavelength different from the communication light from the optical pulse tester into the optical line via an optical coupler installed inside the station, and reflect only the test pulse light installed immediately before each optical receiver. For each reflected light of the test pulse light by the optical filter type reflector to be detected, the light level and position are respectively detected, the reflected light measured in advance for the optical line in the normal state and each branched optical line The light level and position of the reflected light is compared with the light level and position of each reflected light when a bending loss is given to the corresponding optical fiber core wire by a core wire comparison jig. Light level is fluctuating If the optical fiber has a branch, it is determined that the optical fiber has a corresponding optical fiber, and if there is no fluctuation, it is determined that the optical fiber has no optical fiber having the optical fiber having the branched portion. Optical fiber optical fiber contrast method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20562392A JP3324612B2 (en) | 1992-07-31 | 1992-07-31 | Core line contrast method of branch type optical line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20562392A JP3324612B2 (en) | 1992-07-31 | 1992-07-31 | Core line contrast method of branch type optical line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0653907A true JPH0653907A (en) | 1994-02-25 |
| JP3324612B2 JP3324612B2 (en) | 2002-09-17 |
Family
ID=16509955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20562392A Expired - Lifetime JP3324612B2 (en) | 1992-07-31 | 1992-07-31 | Core line contrast method of branch type optical line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3324612B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008309958A (en) * | 2007-06-13 | 2008-12-25 | Nippon Telegr & Teleph Corp <Ntt> | Method for discriminating termination conditions for optical fiber |
| JP2009020029A (en) * | 2007-07-13 | 2009-01-29 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission line remote testing/monitoring method, and optical transmission line remote testing/monitoring system |
| JP2009036738A (en) * | 2007-08-06 | 2009-02-19 | Nippon Telegr & Teleph Corp <Ntt> | Core wire contrasting system and technique |
| JP2009192691A (en) * | 2008-02-13 | 2009-08-27 | Nippon Telegr & Teleph Corp <Ntt> | Live wire decision apparatus and method |
| JP2009244610A (en) * | 2008-03-31 | 2009-10-22 | Nippon Telegr & Teleph Corp <Ntt> | Method of contrasting cores of optical fiber and device |
| JP2013120117A (en) * | 2011-12-07 | 2013-06-17 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber path core wire determination device and method for determining the same |
| JP2014121009A (en) * | 2012-12-18 | 2014-06-30 | Nippon Telegr & Teleph Corp <Ntt> | Communication monitoring device, communication monitoring method and optical line test system |
| JP2020535451A (en) * | 2017-09-29 | 2020-12-03 | フォトニクス プラナー インテグレーション テクノロジー インコーポレイテッド | Polarity detector for patch cord |
-
1992
- 1992-07-31 JP JP20562392A patent/JP3324612B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008309958A (en) * | 2007-06-13 | 2008-12-25 | Nippon Telegr & Teleph Corp <Ntt> | Method for discriminating termination conditions for optical fiber |
| JP2009020029A (en) * | 2007-07-13 | 2009-01-29 | Nippon Telegr & Teleph Corp <Ntt> | Optical transmission line remote testing/monitoring method, and optical transmission line remote testing/monitoring system |
| JP2009036738A (en) * | 2007-08-06 | 2009-02-19 | Nippon Telegr & Teleph Corp <Ntt> | Core wire contrasting system and technique |
| JP2009192691A (en) * | 2008-02-13 | 2009-08-27 | Nippon Telegr & Teleph Corp <Ntt> | Live wire decision apparatus and method |
| JP2009244610A (en) * | 2008-03-31 | 2009-10-22 | Nippon Telegr & Teleph Corp <Ntt> | Method of contrasting cores of optical fiber and device |
| JP2013120117A (en) * | 2011-12-07 | 2013-06-17 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber path core wire determination device and method for determining the same |
| JP2014121009A (en) * | 2012-12-18 | 2014-06-30 | Nippon Telegr & Teleph Corp <Ntt> | Communication monitoring device, communication monitoring method and optical line test system |
| JP2020535451A (en) * | 2017-09-29 | 2020-12-03 | フォトニクス プラナー インテグレーション テクノロジー インコーポレイテッド | Polarity detector for patch cord |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3324612B2 (en) | 2002-09-17 |
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