JPS6134642B2 - - Google Patents
Info
- Publication number
- JPS6134642B2 JPS6134642B2 JP1145280A JP1145280A JPS6134642B2 JP S6134642 B2 JPS6134642 B2 JP S6134642B2 JP 1145280 A JP1145280 A JP 1145280A JP 1145280 A JP1145280 A JP 1145280A JP S6134642 B2 JPS6134642 B2 JP S6134642B2
- Authority
- JP
- Japan
- Prior art keywords
- cable
- optical
- optical fiber
- light
- connection
- 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.)
- Expired
Links
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
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Description
【発明の詳細な説明】
本発明は、布設された光ケーブルの接続工事の
際に光フアイバの接続部分に生じる接続損失を測
定する方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for measuring splice loss occurring at a splicing portion of an optical fiber during splicing work of installed optical cables.
光フアイバの接続損失は、主にコアの軸ずれ、
角度ずれ、フアイバの構造パラメータの差異など
によつて生じ、これは光通信に多大の影響を与え
る。そこで、光ケーブルのフアイバ永久接続（ス
プライシング）は、光伝送路の伝送損失を最小に
押えるため接続損失をモニターしながら行なわれ
る。 Optical fiber splice loss is mainly caused by core misalignment,
This is caused by angular misalignment, differences in fiber structural parameters, etc., and this has a great impact on optical communications. Therefore, permanent fiber splicing (splicing) of optical cables is performed while monitoring the splice loss in order to minimize the transmission loss of the optical transmission line.
複数本のケーブルを接続して光伝送路を構成す
る場合、第１図に示す従来の接続損失測定法によ
ると次の如く行なわれる。布設された光ケーブル
１と光ケーブル２とを接続する場合、まず先行す
る光ケーブル１の反接続端（遠端）３側から接続
する光フアイバ４に光源５から光を入射させて接
続端６に出てくる接続箇所通過前の光出力レベル
P1を測定する。次に、後続の光ケーブル２から光
フアイバ４に接続するフアイバ４′を選び出し光
フアイバ４と４′とを適当な手段により接続す
る。接続が完了すると光フアイバ４の反接続端３
から導入した光は接続部７を通つて光フアイバ
４′の反接続端８に出てくるのでこれを測定し接
続箇所通過後の光出力レベルP2を得る。これらの
値をもとに次の(1)式から接続損失を計算する。 When a plurality of cables are connected to form an optical transmission line, the conventional connection loss measurement method shown in FIG. 1 is performed as follows. When connecting the optical cable 1 and the optical cable 2 that have been laid, first, light is input from the light source 5 into the optical fiber 4 to be connected from the opposite end (far end) 3 side of the preceding optical cable 1, and the light is emitted from the connecting end 6. Light output level before passing through the connection point
Measure P1 . Next, a fiber 4' to be connected to the optical fiber 4 is selected from the subsequent optical cable 2, and the optical fibers 4 and 4' are connected by appropriate means. When the connection is completed, the opposite end 3 of the optical fiber 4
The light introduced from the connection point 7 passes through the connection point 7 and emerges from the opposite connection end 8 of the optical fiber 4', and is measured to obtain the light output level P2 after passing through the connection point. Based on these values, calculate the splice loss using the following equation (1).
接続損失＝−10 logＰ２／Ｐ１
−（光フアイバ４の伝送損失）〔dB〕 ……
……(1)
〔ここで、光フアイバ４の伝送損失はあらかじめ
求められている。〕
斯様にして光ケーブル接続における接続損失は
測定されるが、この従来方法では一直線上に存在
する光の入射端（反接続端）３、接続端６および
光の受光端（反接続端）８の三箇所に作業者を配
置しなければならず、又各作業者間の連絡用に布
設伝送路と同長の電話施設を要するので布設伝送
路が長距離に及ぶ場合にはこのケーブル９の準備
だけでも大変である。電話の代りにトランシーバ
を使用することも考えられるが、山間部やマンホ
ール内あるいはビルの林立する場所では使用不可
能である。Splice loss = -10 logP 2 /P 1 - (transmission loss of optical fiber 4) [dB] ...
...(1) [Here, the transmission loss of the optical fiber 4 is determined in advance. ] Splice loss in optical cable connection is measured in this way, but in this conventional method, the light incident end (opposite connection end) 3, connection end 6, and light receiving end (opposite connection end) 8, which are in a straight line, are measured. Workers must be placed at three locations, and telephone facilities of the same length as the installed transmission line are required for communication between each worker. Preparation alone is difficult. Although it is possible to use a transceiver instead of a telephone, it is impossible to use it in mountainous areas, inside manholes, or in areas where there are many buildings.
本発明は、光フアイバの接続損失の測定を従来
方法よりも少員数でしかも少ない連絡用設備で可
能とするもので、複数本の光フアイバを束ねて成
るケーブルを複数本接続して光伝送路を構成する
に際し、一番端の先行ケーブルの光フアイバ端を
これらフアイバ同士を仮接続してループ状に成
し、後続ケーブル側から導入される光が該光フア
イバ内をＵターンして後続ケーブル側へ戻るよう
に設ける一方、少なくとも一本以上のケーブルか
ら成る前記ループ状光フアイバの一端から測定用
光を導入してこれを他端部分でまず測定し、その
後この他端部分に後続ケーブルを接続してから該
後続ケーブルの反接続端部で更に接続箇所通過後
の光を測定するようにしたことを特徴とする。 The present invention makes it possible to measure the splice loss of optical fibers using fewer people and less communication equipment than conventional methods. When configuring the optical fiber, the optical fiber ends of the leading cable at the end are temporarily connected to each other to form a loop, and the light introduced from the succeeding cable side makes a U-turn inside the optical fiber and connects the fibers to the succeeding cable. At the same time, a measurement light is introduced from one end of the loop-shaped optical fiber consisting of at least one cable, and the measurement light is first measured at the other end, and then a subsequent cable is connected to the other end. The present invention is characterized in that after the connection, the light after passing through the connection point is further measured at the opposite end of the subsequent cable.
以下本発明方法を図面に示す一実施例に基づい
て詳細に説明する。 The method of the present invention will be explained in detail below based on an embodiment shown in the drawings.
光伝送路は、通常、複数本の光フアイバが束ね
られて成るケーブルを複数本接続してつくられ
る。まず始めに、一番端に布設された先行ケーブ
ル１の複数本の光フアイバ４，１０の一端をこれ
らフアイバ同士を結ぶように仮接続してループに
成し、後続ケーブル側から導入される光が該ケー
ブル１内をＵターンして後続ケーブル側へ戻るよ
うに設ける。説明の便宜上光フアイバは４と１０
の２本が表わされているが、２本以上ある場合に
はその中から任意に２本ずつ選んで仮接続し光フ
アイバの一端をループ状に成す。つまり、光フア
イバが６本あれば３組の仮接続部１１・ループ状
フアイバが構成される。次に、光フアイバ４と後
続ケーブル２の光フアイバ４′とを接続端６部分
で仮接続する。この仮接続によりケーブル２の光
フアイバ４′もループ状光フアイバの一部分とな
る。その後、ループ状光フアイバの一端であるフ
アイバ４′の反接続端（遠端）８から光源５の光
を光フアイバ４′に入射する。そうすると、光は
光フアイバ４′、仮接続部１２、光フアイバ４、
仮接続部１１および光フアイバ１０を通つて接続
端６すなわちループ状光フアイバの他端に出てく
るのでここでこの出力レベルP1を測定する。その
後適当な手段によつて光フアイバ１０と１０′と
を永久接続する。この接続が完了すると光は接結
部７および光フアイバ１０′を通つて反接続端８
に出てくるのでこの光出力レベルP2を測定し、こ
れらの値をもとに(2)式から接続損失を計算する。 An optical transmission line is usually made by connecting a plurality of cables each made of a plurality of bundled optical fibers. First, one end of the plurality of optical fibers 4, 10 of the preceding cable 1 installed at the end is temporarily connected to form a loop so that the optical fibers introduced from the succeeding cable side are connected. is provided so that it makes a U-turn inside the cable 1 and returns to the succeeding cable side. For convenience of explanation, optical fibers are 4 and 10.
Two optical fibers are shown, but if there are two or more optical fibers, two of them are arbitrarily selected and temporarily connected to form one end of the optical fiber into a loop. In other words, if there are six optical fibers, three sets of temporary connection portions 11 and loop-shaped fibers are formed. Next, the optical fiber 4 and the optical fiber 4' of the succeeding cable 2 are temporarily connected at the connection end 6 portion. Due to this temporary connection, the optical fiber 4' of the cable 2 also becomes part of the looped optical fiber. Thereafter, the light from the light source 5 is input to the optical fiber 4' from the opposite end (far end) 8 of the fiber 4', which is one end of the looped optical fiber. Then, the light is transmitted through the optical fiber 4', the temporary connection part 12, the optical fiber 4,
It passes through the temporary connection part 11 and the optical fiber 10 and comes out to the connection end 6, that is, the other end of the looped optical fiber, and the output level P1 is measured here. Optical fibers 10 and 10' are then permanently connected by suitable means. When this connection is completed, the light passes through the connection part 7 and the optical fiber 10' to the opposite connection end 8.
Therefore, this optical output level P 2 is measured, and the splice loss is calculated from equation (2) based on these values.
接続損失＝−10 logＰ２／Ｐ１
−（光フアイバ10′の伝送損失）〔dB〕 ……
……(2)
〔ここで、光フアイバ１０′の伝送損失はあらかじ
め求められている。〕
これで光フアイバ一心、一箇所の接続が完了す
る。次に、仮接続部１２を切り離し、光をフアイ
バ１０′の反接続端８から入射する。光源５から
の光は光フアイバ１０′，１０および４を通つて
接続端６に出てくるのでここで光出力P1を測定す
る。次いで光フアイバ４と４′とを永久接続し、
接続後の反接続端８に出てくる光出力P2を測定し
て接続損失を計算する。以下この方法を繰り返し
一箇所の全接続が完了すると次の接続端（ケーブ
ル２の反接続端８）および光の入射端（ケーブル
２′の反接続端１３）へそれぞれ移動し同じ作業
を行なう。但し、一番端の先行ケーブル１の光フ
アイバ４および１０は既にループ状に仮接続され
ているので２回目以後の作業は簡単になる。尚、
光フアイバ４と４′とを仮接続せずにここに光源
をとることも可能である。Splice loss = -10 logP 2 /P 1 - (transmission loss of optical fiber 10') [dB] ...
...(2) [Here, the transmission loss of the optical fiber 10' is determined in advance. ] This completes a single optical fiber connection at one location. Next, the temporary connection portion 12 is cut off, and light is incident from the opposite connection end 8 of the fiber 10'. The light from the light source 5 passes through the optical fibers 10', 10 and 4 and emerges at the connection end 6, where the optical output P1 is measured. Next, the optical fibers 4 and 4' are permanently connected,
After the connection, the optical output P 2 output from the opposite connection end 8 is measured to calculate the connection loss. Thereafter, this method is repeated until all connections at one location are completed, and the same operation is performed by moving to the next connection end (the opposite connection end 8 of the cable 2) and the light incident end (the opposite connection end 13 of the cable 2'). However, since the optical fibers 4 and 10 of the leading cable 1 at the end have already been temporarily connected in a loop, the work from the second time onwards will be easier. still,
It is also possible to provide a light source here without temporarily connecting the optical fibers 4 and 4'.
斯様に本発明の方法によると、測定用光をケー
ブル内でＵターンさせるようにしたので作業者の
配置箇所を従来の３箇所から２箇所に減らすこと
ができる。また、長距離伝送路の工事でも連結用
の電話回線ケーブル長は接続するケーブルの一区
間分の長ささえあれば事足り、これまでのように
光ケーブルの布設全長と同じ長さだけ準備する必
要がない。例えば、従来の方法によると、500ｍ
程の長さの光ケーブルを10本布設する場合には、
５Kmの長さの電話用ケーブルを必要としたが、本
発明の方法によると一区間分の500ｍ程で事足り
る。 According to the method of the present invention, since the measurement light is made to make a U-turn within the cable, the number of locations for placing workers can be reduced from the conventional three locations to two locations. In addition, when constructing long-distance transmission lines, the length of the connecting telephone line cable only needs to be the length of one section of the cable to be connected, and there is no need to prepare the same length as the total length of the optical cable as in the past. . For example, according to the traditional method, 500m
When installing 10 optical cables of approximately the same length,
A telephone cable of 5 km in length was required, but according to the method of the present invention, only one section of 500 m is sufficient.
第１図は従来の光フアイバ永久接続損失測定法
を示す説明図、第２図は本発明の光フアイバ永久
接続損失測定法を示す説明図である。
図面中、１，２および２′は光ケーブル、４，
４′，１０，１０′は光フアイバ、５は光源、６は
接続端、７は接続部（永久接続部）、３および８
は反接続端、９は電話用ケーブル、１１および１
２は仮接続である。
FIG. 1 is an explanatory diagram showing a conventional optical fiber permanent splice loss measurement method, and FIG. 2 is an explanatory diagram showing an optical fiber permanent splice loss measurement method of the present invention. In the drawing, 1, 2 and 2' are optical cables, 4,
4', 10, 10' are optical fibers, 5 is a light source, 6 is a connection end, 7 is a connection part (permanent connection part), 3 and 8
is the opposite connection end, 9 is the telephone cable, 11 and 1
2 is a temporary connection.
Claims (1)
複数本接続して光伝送路を構成するに際し、一番
端の先行ケーブルの光フアイバ端をこれらフアイ
バ同士を仮接続してループ状に成し、後続ケーブ
ル側から導入される光が該光フアイバ内をＵター
ンして後続ケーブル側へ戻るように設ける一方、
少なくとも一本以上のケーブルから成る前記ルー
プ状光フアイバの一端から測定用光を導入してこ
れを他端部分でまず測定し、その後この他端部分
に後続ケーブルを接続してから該後続ケーブルの
反接続端部で更に接続箇所通過後の光を測定する
ようにしたことを特徴とする光ケーブルの接続損
失測定方法。1. When configuring an optical transmission line by connecting multiple cables made by bundling multiple optical fibers, the optical fiber ends of the leading cable at the end are temporarily connected to each other to form a loop, The light introduced from the subsequent cable side is provided so that it makes a U-turn within the optical fiber and returns to the subsequent cable side,
Measurement light is introduced from one end of the looped optical fiber consisting of at least one cable, and is first measured at the other end, after which a subsequent cable is connected to the other end. A method for measuring splice loss of an optical cable, characterized in that light after passing through a splicing point is further measured at the opposite end of the splice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1145280A JPS56109309A (en) | 1980-02-04 | 1980-02-04 | Measuring method for connection loss of optical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1145280A JPS56109309A (en) | 1980-02-04 | 1980-02-04 | Measuring method for connection loss of optical cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56109309A JPS56109309A (en) | 1981-08-29 |
| JPS6134642B2 true JPS6134642B2 (en) | 1986-08-08 |
Family
ID=11778484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1145280A Granted JPS56109309A (en) | 1980-02-04 | 1980-02-04 | Measuring method for connection loss of optical cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56109309A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017708A (en) * | 1983-07-11 | 1985-01-29 | Fujikura Ltd | Connecting method of single mode optical fiber |
-
1980
- 1980-02-04 JP JP1145280A patent/JPS56109309A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56109309A (en) | 1981-08-29 |
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