JPS62191733A - Optical pulse tester - Google Patents
Optical pulse testerInfo
- Publication number
- JPS62191733A JPS62191733A JP3337386A JP3337386A JPS62191733A JP S62191733 A JPS62191733 A JP S62191733A JP 3337386 A JP3337386 A JP 3337386A JP 3337386 A JP3337386 A JP 3337386A JP S62191733 A JPS62191733 A JP S62191733A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- pulse
- optical fiber
- optical pulse
- measured
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 95
- 239000013307 optical fiber Substances 0.000 claims abstract description 60
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- WSMQKESQZFQMFW-UHFFFAOYSA-N 5-methyl-pyrazole-3-carboxylic acid Chemical compound CC1=CC(C(O)=O)=NN1 WSMQKESQZFQMFW-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
- G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
- G01M11/3136—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR for testing of multiple fibers
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光パルス試験器に関し、特に、複数の光ファイ
バ芯線に順番に、連続的に光パルスを入射させる、ある
いは複数の光ファイバ芯線中の任意の光ファイバ芯線に
光パルスを入射させる等、複数の光ファイバ芯線に光パ
ルスを入射させることを可能とする光パルス試験器に関
する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical pulse tester, and in particular, a device for injecting optical pulses sequentially and continuously into a plurality of optical fiber cores, or The present invention relates to an optical pulse tester that makes it possible to input optical pulses to a plurality of optical fiber cores, such as inputting optical pulses to any optical fiber core.
第３図は従来の光パルス試験器の一例を示すものである
。図において、１は光パルス試験器の本体であり、パル
ス発生器２．該パルス発生器２により駆動されて光パル
スを発生するレーザダイオードから成る電気−光変換器
（Ｅ／○）３．光方向性結合器４．アバランシェホトダ
イオード（ＡＰＤ）から成る光−電気変換器（０／Ｅ）
５．増幅器６．平均化処理ユニット７、ディスプレイ８
から構成されている。なお、９は被測定光ファイバ芯線
、１０は光パルス試験器１と被測定光ファイバ芯線９と
を接続するための、光コネクタを示している。FIG. 3 shows an example of a conventional optical pulse tester. In the figure, 1 is the main body of the optical pulse tester, pulse generator 2. 3. An electro-optical converter (E/○) consisting of a laser diode that is driven by the pulse generator 2 to generate optical pulses. Optical directional coupler4. Optical-to-electrical converter (0/E) consisting of an avalanche photodiode (APD)
5. Amplifier 6. Averaging processing unit 7, display 8
It consists of Note that 9 indicates an optical fiber core wire to be measured, and 10 indicates an optical connector for connecting the optical pulse tester 1 and the optical fiber core wire 9 to be measured.
上述の如く構成された従来の光パルス試験器においては
、パルス発生器２により駆動された電気−光変換器（Ｅ
ｌｏ）３から発生した光パルスが、光方向性結合器４．
光コネクタ１０を経て、被測定光ファイバ芯線９に入射
する。該被測定光ファイバ芯ＩＩＩＡＱ内で生じた後方
散乱光、あるいは、光ファイバ端面で生じたフレネル反
射光は、上記光方向性結合器４を通して、前記光−電気
変換器（０／Ｅ）５のアバランシェホトダイオード（Ａ
ＰＤ）に入射し、電気パルスに変換される。In the conventional optical pulse tester configured as described above, an electric-to-optical converter (E
The optical pulse generated from the optical directional coupler 4.lo)3 is transmitted to the optical directional coupler 4.lo).
The light passes through the optical connector 10 and enters the optical fiber core 9 to be measured. The backscattered light generated within the optical fiber core IIIAQ to be measured or the Fresnel reflected light generated at the end face of the optical fiber passes through the optical directional coupler 4 to the optical-to-electrical converter (0/E) 5. Avalanche photodiode (A
PD) and is converted into an electrical pulse.
この受信信号は微弱であるため増幅器６で増幅され、繰
り返し測定を行って上記平均化処理ユニット７でＳ／Ｎ
比を改善した後、ディスプレイ８に表示される。Since this received signal is weak, it is amplified by an amplifier 6, and after repeated measurements, the S/N is determined by the averaging processing unit 7.
After improving the ratio, it is displayed on the display 8.
しかしながら、上述の如く構成された従来の光パルス試
験器１には、該光パルス試験器１と被測定光ファイバ芯
線９とが光コネクタｌＯにより接続され、１芯線しか測
定できなかった。However, in the conventional optical pulse tester 1 configured as described above, the optical pulse tester 1 and the optical fiber core wire 9 to be measured are connected by an optical connector IO, and only one core wire can be measured.
このため、多くの被測定光ファイバ芯線を試験する場合
には、その都度、光コネクタ１０により光パルス試験器
１を脱着する必要があり、作業性が大変悪いという問題
があった。また、多くの被測定光ファイバ芯線を連続的
に測定することができないという問題もあった。For this reason, when testing a large number of optical fiber core wires to be measured, it is necessary to attach and detach the optical pulse tester 1 through the optical connector 10 each time, which poses a problem of very poor workability. Another problem was that it was not possible to continuously measure a large number of optical fiber cores to be measured.
本発明は上記事情に鑑みてなされたもので、その目的と
するところは、従来の光パルス試験器における上述の如
き問題を解消し、複数の光ファイバ芯線中の任意の光フ
ァイバ芯線に光パルスを入射させる、あるいは、複数の
光ファイバ芯線に順番に、連続的に光パルスを入射させ
る等、複数の光ファイバ芯線に光パルスを入射させるこ
とを可能とし、光ファイバ芯線の効率的な試験、あるい
は、複数の被測定光ファイバ芯線の連続的な試験を行う
ことが可能な光パルス試験器を提供することにある。The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in conventional optical pulse testers, and to apply optical pulses to any one of a plurality of optical fiber core wires. It is possible to input optical pulses into multiple optical fiber core wires, such as by injecting optical pulses into multiple optical fiber core wires, or by sequentially and continuously injecting optical pulses into multiple optical fiber core wires, and efficient testing of optical fiber core wires. Another object of the present invention is to provide an optical pulse tester capable of continuously testing a plurality of optical fiber core wires to be measured.
本発明の上記目的は、光パルス発生手段と、該光パルス
を供給された光ファイバ芯線からの反射光を受光する手
段とを有する、光ファイバ芯線の破断点、不連続点等の
探索を行うための光パルス試験器において、前記光パル
ス発生手段から発生する光パルスを、時分割的に複数の
被測定光ファイバ芯線に供給する手段を設けたことを特
徴とする光パルス試験器によって達成される。The above object of the present invention is to search for break points, discontinuity points, etc. of an optical fiber core wire, which has a light pulse generating means and a means for receiving reflected light from the optical fiber core wire supplied with the light pulse. This is achieved by an optical pulse tester characterized in that the optical pulse tester is provided with means for time-divisionally supplying the optical pulses generated from the optical pulse generating means to a plurality of optical fiber core wires to be measured. Ru.
本発明においては、光パルス試験器を複数の被測定光フ
ァイバ芯線に常時接続した状態としておき、光パルスを
上記複数の被測定光ファイバ芯線に時分割的に供給する
ことにより、上記複数の被測定光ファイバ芯線中の任意
の被測定光ファイバ芯線に、あるいは、上記複数の被測
定光ファイバ芯線に、順次、連続的に光パルスを入射さ
せることを可能としたものである。In the present invention, an optical pulse tester is always connected to a plurality of optical fiber core wires to be measured, and optical pulses are supplied to the plurality of optical fiber core wires to be measured in a time-sharing manner. This makes it possible to sequentially and continuously inject a light pulse into any optical fiber core to be measured among the cores of the optical fibers to be measured, or to the plurality of cores of the optical fibers to be measured.
以下、本発明の実施例を図面に基づいて詳細に説明する
。Embodiments of the present invention will be described in detail below with reference to the drawings.
第１図は本発明の一実施例を示す、被測定光ファイバ芯
線８端子用光パルス試験器の構成図である。図において
、記号１〜８は先に第３図に示したと同じ構成要素を示
しており、９ａ〜９ｈは被測定光ファイバ芯線、１０ａ
〜１０ｈは光コネクタ、１１およびｌｌａ〜ｌｌｈはい
わゆる集束形レンズを示している。FIG. 1 is a configuration diagram of an optical pulse tester for eight terminals of an optical fiber core wire to be measured, showing an embodiment of the present invention. In the figure, symbols 1 to 8 indicate the same components as previously shown in FIG.
-10h are optical connectors, and 11 and lla to llh are so-called focusing lenses.
なお、被測定光ファイバ芯線９ａ〜９ｈ、光コネクタ１
０ａ”ｌＯｈは、それぞれ、前記従来例に示した被測定
光ファイバ芯線９および光コネクタ１０に対応するもの
を複数設けたことを示している。In addition, the optical fiber core wires 9a to 9h to be measured, the optical connector 1
0a''lOh indicates that a plurality of optical fiber cores 9 and optical connectors 10 corresponding to the conventional example are provided.
同様に、集束形レンズｌｌａ〜ｌｌｈは、集束形レンズ
１１を複数設けたことを示している。Similarly, converging lenses lla to llh indicate that a plurality of converging lenses 11 are provided.
また、１４は上記光コネクタ１０ａ〜１０ｈ、集束形レ
ンズｌｌミル１１ｈ、ミラー１２．パルスモータ１３等
から構成される光パルス分岐ユニットを示している。Further, reference numeral 14 denotes the optical connectors 10a to 10h, a converging lens 11h, a mirror 12. An optical pulse branching unit composed of a pulse motor 13 and the like is shown.
本実施例の光パルス試験器の動作は以下の通りである。The operation of the optical pulse tester of this embodiment is as follows.
先に説明した従来の光パルス試験器１におけると同様の
方法で発生させた光パルスが、光方向性結合器４を経て
集束形レンズ１１に入射する。該集束形レンズ１１で平
行ビームに変換された光パルスは、パルスモータ１３に
よって回転するミラー１２により反射され、集束形レン
ズｌｌａ〜１１ｈ、光コネフタ１０ａ〜１０ｈを経て、
被測定光ファイバ芯線９ａ〜９ｈに入射される。Optical pulses generated in the same manner as in the conventional optical pulse tester 1 described above enter the converging lens 11 via the optical directional coupler 4. The optical pulse converted into a parallel beam by the converging lens 11 is reflected by a mirror 12 rotated by a pulse motor 13, passes through converging lenses lla to 11h, optical connectors 10a to 10h,
The light is input to the optical fiber core wires 9a to 9h to be measured.
上記被測定光ファイバ芯線９ａ〜９ｈ内で生した後方散
乱光等は、上記光パルスの入射方向とは逆方向に、光コ
ネクタ１０ａ〜１０ｈ、集束形レンズ１１ａ〜ｌｌｈを
経てミラー１２により反射され、集束形レンズ１１．光
方向性績合器４を経て前記光−電気変換器（０／Ｅ）５
のアバランシェホトダイオード（Ａ Ｐ Ｄ）に入射し
、電気パルスに変換される。The backscattered light generated in the optical fiber core wires 9a to 9h to be measured is reflected by the mirror 12 through the optical connectors 10a to 10h and the converging lenses 11a to llh in the opposite direction to the incident direction of the optical pulse. , converging lens 11. The optical-to-electrical converter (0/E) 5 passes through the optical directionality combiner 4
The light enters an avalanche photodiode (APD) and is converted into an electric pulse.
この信号の処理については、先の従来方式と同様で良い
。Processing of this signal may be the same as in the conventional method described above.
本実施例によれば、８本の被測定光ファイバ芯線の試験
を行う場合、パルスモータ１３を制御することにより、
８本の被測定光ファイバ芯線９ａ〜９ｈに、あるいは、
任意の指定した被測定光ファイバ芯線（例えば、９ａ）
のみに、連続的に、光パルスを入射させ、被測定光ファ
イバ芯線の破断点または不連続点等の探索を行うことが
できる。According to this embodiment, when testing eight optical fiber core wires to be measured, by controlling the pulse motor 13,
To the eight optical fiber core wires 9a to 9h to be measured, or
Any specified optical fiber core wire to be measured (for example, 9a)
Only by continuously injecting optical pulses, it is possible to search for break points or discontinuous points in the optical fiber core wire to be measured.
上記実施例においては、８個の集束形レンズ１１ａ〜ｌ
ｌｈへの光パルスの分岐、または、８個の集束形レンズ
ｌｌａ〜ｌｌｂからの反射光の摘出に、パルスモータ１
３により駆動されるミラー１２を用いたが、上記ミラー
１２の代りに、プリズムを用いる等、他の方式を用いる
ことも可能であることは言うまでもない。In the above embodiment, eight converging lenses 11a-l
The pulse motor 1 is used for branching the optical pulse to lh or extracting the reflected light from the eight converging lenses lla to llb.
Although the mirror 12 driven by the mirror 12 is used, it goes without saying that other systems such as a prism may be used in place of the mirror 12.
第２図は本発明の他の実施例の要部を示す構成図であり
、図において、記号４は先に示したと同じ光方向性結合
器、９ａ〜９ｎおよび１０ａ〜Ｉｏｎは前記従来例に示
した被測定光ファイバ芯ｍ９および光コネクタ１０に対
応するものを、複数設けたことを示している。FIG. 2 is a block diagram showing the main parts of another embodiment of the present invention. In the figure, symbol 4 is the same optical directional coupler as shown above, and 9a to 9n and 10a to Ion are the same as those in the conventional example. It is shown that a plurality of optical fiber cores m9 and optical connectors 10 to be measured are provided corresponding to the illustrated optical fiber core m9 and optical connector 10.
また、１４ＡはＬｉＮｂ０．（リチウム・ナイオベート
）等の電気光学効果素子１５．光ファイバ芯線あるいは
光ファイバ素線から構成される光ファイバアレー１６．
および電極１７Ａおよび１７Ｂから構成される光パルス
分岐ユニットを示している。Moreover, 14A is LiNb0. Electro-optic effect element such as (lithium niobate) 15. Optical fiber array 16 consisting of optical fiber core wires or optical fiber bare wires.
and an optical pulse branching unit composed of electrodes 17A and 17B.
本実施例の光パルス試験器の動作は以下の通りである。The operation of the optical pulse tester of this embodiment is as follows.
先に説明した従来の光パルス試験器１におけると同様の
方法で発生させた光パルスが、光方向性結合器４を経て
上記電気光学効果素子１５に入射される。電気光学効果
素子は電界によって屈折率が変化するため、上記電気光
学効果素子１５に入射した光パルスは、電極１７Ａおよ
び１７Ｂによって印加される電界により屈折され、光フ
ァイバアレー１６に入射される。Optical pulses generated in the same manner as in the conventional optical pulse tester 1 described above are incident on the electro-optic effect element 15 via the optical directional coupler 4. Since the refractive index of the electro-optic effect element changes depending on the electric field, the light pulse incident on the electro-optic effect element 15 is refracted by the electric field applied by the electrodes 17A and 17B, and then enters the optical fiber array 16.
光ファイバアレー１６は片端で一芯毎に分岐されており
、光コネクタ１０ａ〜Ｉｏｎによって、被測定光ファイ
バ芯線９ａ〜９ｎに接続される。これにより、被測定光
ファイバ芯線９ａ〜９ｎ内で生じた後方散乱光等は、先
の実施例の場合と同様にして、ディスプレイに表示され
る。The optical fiber array 16 is branched into individual cores at one end, and connected to the optical fiber cores 9a to 9n to be measured by optical connectors 10a to Ion. As a result, backscattered light and the like generated within the optical fiber cores 9a to 9n to be measured are displayed on the display in the same manner as in the previous embodiment.
本実施例においては、複数の被測定光ファイバ芯線９ａ
〜９ｎの試験を行う場合、電極１７Ａおよび１７Ｂによ
り印加する電界を制御することによって、複数の被測定
光ファイバ芯線９ａ〜９ｎに連続的に、あるいは、任意
の指定した被測定光ファイバ芯線（例えば、９ａ）のみ
に選択的に、光パルスを入射させ、被測定光ファイバ芯
線の破断点または不連続点等の探索を行うことができる
。In this embodiment, a plurality of optical fiber core wires 9a to be measured are used.
- 9n, by controlling the electric field applied by the electrodes 17A and 17B, the test can be performed continuously on the plurality of optical fiber core wires 9a to 9n, or on any specified optical fiber core wire (e.g. , 9a), it is possible to search for a break point or a discontinuous point in the core of the optical fiber to be measured.
上記実施例に示した電気光学効果素子１５としては、Ｌ
ｉＮｂ０．の他にも、ＬｉＴａ○、（リチウム・タンタ
レート）等も利用可能である。As the electro-optic effect element 15 shown in the above embodiment, L
iNb0. Besides, LiTa○, (lithium tantalate), etc. can also be used.
上記各実施例においては、従来の技術に比較して、多く
の被測定光ファイバ芯線の測定用端子を設けているため
、作業性に優れるとともに、光パルス試験器の台数を少
なくできるという経済的効果もある。In each of the above embodiments, compared to the conventional technology, many measurement terminals are provided for the optical fiber core wire to be measured, so it is not only easy to work but also economical because the number of optical pulse testers can be reduced. It's also effective.
本発明の応用分野としては、電話局内の光ＭＤＦ（元本
配線盤）において、光分岐器と組合わせて加入者光線路
の光ファイバ芯線の定期的診断を行う装置等を挙げるこ
とができる。Examples of the field of application of the present invention include a device for periodically diagnosing the optical fiber core of a subscriber's optical line in combination with an optical splitter in an optical MDF (main distribution frame) in a telephone office.
以上述べた如く、本発明によれば、複数の被測定光ファ
イバ芯線に連続的に、あるいは、任意の指定した被測定
光ファイバ芯線に、光パルスを入射させることができ、
作業性に優れた光パルス試験器を実現できるという顕著
な効果を奏するものである。また、複数の被測定光ファ
イバ芯線の試験が１台の光パルス試験器で可能になると
いう経済的効果もある。As described above, according to the present invention, optical pulses can be made to enter a plurality of optical fiber cores to be measured continuously or to any specified optical fiber core to be measured,
This has the remarkable effect of realizing an optical pulse tester with excellent workability. There is also an economical effect in that a single optical pulse tester can test a plurality of optical fiber core wires to be measured.
第１図は本発明の一実施例を示す光パルス試験器の構成
図、第２図は本発明の他の実施例の要部を示す構成図、
第３図は従来の光パルス試験器の一例を示す構成図であ
る。
１：光パルス試験器、２：パルス発生器、３：電気−光
変換器、４：光方向性結合器４，５：光−電気変換器、
９，９ａ〜９ｎ：被測定光ファイバ芯線、１０．１０ａ
〜１０ｎ＝光コネクタ、１１． ｌｌａ〜１１ｈ：集束
形レンズ、１２：ミラー、 １４．１４Ａ ：光パルス
分岐ユニット、１５：電気光学効果素子、１６：光ファ
イバアレー。
第 ２ 図
第 ３ 図FIG. 1 is a block diagram of an optical pulse tester showing one embodiment of the present invention, FIG. 2 is a block diagram showing the main parts of another embodiment of the present invention,
FIG. 3 is a configuration diagram showing an example of a conventional optical pulse tester. 1: Optical pulse tester, 2: Pulse generator, 3: Electrical-optical converter, 4: Optical directional coupler 4, 5: Optical-electrical converter,
9, 9a to 9n: Optical fiber core wire to be measured, 10.10a
~10n=optical connector, 11. lla to 11h: focusing lens, 12: mirror, 14.14A: optical pulse branching unit, 15: electro-optic effect element, 16: optical fiber array. Figure 2 Figure 3
Claims (3)
ファイバ芯線からの反射光を受光する手段とを有する光
パルス試験器において、前記光パルス発生手段から発生
する光パルスを、時分割的に複数の被測定光ファイバ芯
線に供給する手段を設けたことを特徴とする光パルス試
験器。(1) In an optical pulse tester having an optical pulse generating means and a means for receiving reflected light from an optical fiber core wire supplied with the optical pulse, the optical pulse generated from the optical pulse generating means is time-divided. 1. An optical pulse tester characterized in that the optical pulse tester is provided with a means for supplying a plurality of optical fiber cores to be measured.
等の光学的反射手段と該光学的反射手段を駆動する駆動
手段とから成ることを特徴とする特許請求の範囲第１項
記載の光パルス試験器。(2) The light pulse test according to claim 1, wherein the light pulse supply means comprises an optical reflection means such as a mirror or a prism, and a driving means for driving the optical reflection means. vessel.
電気光学効果素子を駆動する駆動手段とから成ることを
特徴とする特許請求の範囲第１項記載の光パルス試験器
。(3) The optical pulse tester according to claim 1, wherein the optical pulse supply means comprises an electro-optic effect element and a driving means for driving the electro-optic effect element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3337386A JPS62191733A (en) | 1986-02-18 | 1986-02-18 | Optical pulse tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3337386A JPS62191733A (en) | 1986-02-18 | 1986-02-18 | Optical pulse tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62191733A true JPS62191733A (en) | 1987-08-22 |
Family
ID=12384782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3337386A Pending JPS62191733A (en) | 1986-02-18 | 1986-02-18 | Optical pulse tester |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62191733A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0903879A3 (en) * | 1997-09-22 | 2004-10-13 | Lucent Technologies Inc. | Apparatus and method for monitoring optical fibers |
| JP2019215168A (en) * | 2018-06-11 | 2019-12-19 | 日本電信電話株式会社 | Light pulse test device and light pulse test method |
-
1986
- 1986-02-18 JP JP3337386A patent/JPS62191733A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0903879A3 (en) * | 1997-09-22 | 2004-10-13 | Lucent Technologies Inc. | Apparatus and method for monitoring optical fibers |
| JP2019215168A (en) * | 2018-06-11 | 2019-12-19 | 日本電信電話株式会社 | Light pulse test device and light pulse test method |
| WO2019239961A1 (en) * | 2018-06-11 | 2019-12-19 | 日本電信電話株式会社 | Optical pulse testing device and optical pulse testing method |
| US11199473B2 (en) | 2018-06-11 | 2021-12-14 | Nippon Telegraph And Telephone Corporation | Optical pulse testing device and optical pulse testing method |
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