JPS5895311A - Monitor connecting method of optical fiber for optical repeater - Google Patents
Monitor connecting method of optical fiber for optical repeaterInfo
- Publication number
- JPS5895311A JPS5895311A JP19168381A JP19168381A JPS5895311A JP S5895311 A JPS5895311 A JP S5895311A JP 19168381 A JP19168381 A JP 19168381A JP 19168381 A JP19168381 A JP 19168381A JP S5895311 A JPS5895311 A JP S5895311A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- fiber
- error rate
- input
- optical
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3801—Permanent connections, i.e. wherein fibres are kept aligned by mechanical means
- G02B6/3803—Adjustment or alignment devices for alignment prior to splicing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
続における接続状態を監視しながら接続を行う光中継器
用光ファイバのモニタ接続方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for monitoring and connecting optical fibers for optical repeaters, which connects optical fibers while monitoring the connection status of the connections.
光ファイバ、例えば単一モード光ファイバを杉。Cedar optical fiber, for example single mode optical fiber.
（１）
続するにあたっては、ファイバ中のコア位置がずれると
接続損失が増える。そこで、光ファイバの接続部を監視
しながら接続を行い、以てコア位置のずれをなくなすよ
うにすることが必要となる。(1) When connecting fibers, if the core position in the fiber shifts, splice loss increases. Therefore, it is necessary to perform the connection while monitoring the connection portion of the optical fiber, thereby eliminating the deviation of the core position.
例えば、光中継器信号入力用光ファイバと伝送路光ファ
イバとの永久接続、すなわち両者を融着する際の接続状
態を監視するために、従来は第１図に示す方法が考えら
れていた。ここで、光中継器／は信号入力用ファイバー
、このファイバーに結合された入力受光素子３、この入
力受光素子３の出力を受ける再生中継回路グ、再生中継
回路ｌの出力に応動して駆動されて発光する発光素子ｊ
１および発光素子ｊからの光を導く信号出力用ファイバ
６から成る。信号入力用ファイバλと伝送路光ファイバ
７とを接続点ざで融着接続するにあたっては、光中継器
／の中に信号Ｓのモニタ回路９およびモニタ信号引出し
線１０を付加し、受光電力が最大になるよう接続点ｔの
ファイバ相対位置を制御装置／／で制御していた。制御
装置ｌ／はモニタ信号引出し線／θからのモニタ出力を
供給され、そ（ｒ ）
のモニタ出力により接続点ｒにおける光ファイバλの３
軸調整やλ軸回転調整を行うマニピュレータとすること
ができる。あるいは、モニタ出力に応じて操作者が手動
で光ファイバーの軸調整を行う形態とすることもできる
。しかし、この方法では、通常の伝送路構成上は不用な
モニタ回路を中継器内に設けることが必要となるため、
実装スペースおよび給電電力の増加が見込まれ、また接
続終了後はモニタ信号引出し線／θを処理しなければな
らない等の欠点があった。For example, in order to monitor the permanent connection between the optical repeater signal input optical fiber and the transmission line optical fiber, that is, the connection state when the two are fused together, the method shown in FIG. 1 has conventionally been considered. Here, the optical repeater / is a signal input fiber, an input light receiving element 3 coupled to this fiber, a regenerative repeater circuit receiving the output of this input light receiving element 3, and a regenerative repeater circuit 1 driven in response to the output of the regenerative repeater circuit l. A light emitting element that emits light
1 and a signal output fiber 6 that guides light from the light emitting element j. When fusion splicing the signal input fiber λ and the transmission line optical fiber 7 at the connection point, a monitor circuit 9 for the signal S and a monitor signal lead line 10 are added to the optical repeater/, and the received light power is The relative position of the fiber at the connection point t was controlled by the controller // to maximize the fiber position. The control device l/ is supplied with the monitor output from the monitor signal lead line /θ, and the monitor output of the control device l/ is used to control the output of the optical fiber λ at the connection point r.
It can be a manipulator that performs axis adjustment and λ-axis rotation adjustment. Alternatively, it is also possible to adopt a configuration in which the operator manually adjusts the axis of the optical fiber according to the monitor output. However, with this method, it is necessary to install a monitor circuit inside the repeater, which is unnecessary in the normal transmission line configuration.
The mounting space and power supply are expected to increase, and the monitor signal lead line /θ must be processed after the connection is completed.
そこで、本発明の目的は、以上に述べた欠点を除失する
ために、中継器の受光素子に直流雑光を入力し、等何曲
に中継器の入力信号対雑音電力比を劣化させることによ
って中継器の符号誤り率により、中継器と伝送用光ファ
イバとの接続状態を監視し得る光中継器用光ファイバの
モニタ接続方法を提案することにある。かかる目的を達
成するために本発明では、光ファイバを伝送媒体とする
光中継器の入力受光素子に結合された信号入力用光ファ
イバと伝送路光ファイバとを融着接続するにあたり、前
記入力受光素子に直流雑光を導き、前記光中継器の符号
誤り率を測定しながら、前記信号入力用光ファイバと伝
送路光ファイバとの接続される端面の相対位置を調整し
、前記光中継器の符号誤り率が最良になる位置で前記信
号入力用光ファイバと伝送路光ファイバとの融着接続を
行う。SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned drawbacks, it is an object of the present invention to input DC noise light into the light receiving element of a repeater, thereby degrading the input signal-to-noise power ratio of the repeater. An object of the present invention is to propose a method for monitoring and connecting an optical fiber for an optical repeater by which the connection state between the repeater and the transmission optical fiber can be monitored based on the code error rate of the repeater. In order to achieve such an object, the present invention provides a method for fusion-splicing a signal input optical fiber coupled to an input light receiving element of an optical repeater using an optical fiber as a transmission medium and a transmission path optical fiber. Direct current noise is introduced into the element, and while measuring the code error rate of the optical repeater, the relative position of the end face where the signal input optical fiber and the transmission line optical fiber are connected is adjusted, and the optical repeater is adjusted. Fusion splicing is performed between the signal input optical fiber and the transmission line optical fiber at a position where the bit error rate is the best.
以下に図面を参照して本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.
第一図は本発明の実施例であって、ここに１２は誤り率
測定器、１３は雑光入力用ファイバである。FIG. 1 shows an embodiment of the present invention, where 12 is an error rate measuring device and 13 is a fiber for inputting noise light.
図中、第７図と同様の個所には同一符号を付すことにす
る。伝送路光ファイバ７で伝送されてきた信号電力を８
１接続点ｒの損失をαとすると、受光素子３にはＳ−α
の信号が入力される、さらに雑光入力用ファイバ１３に
よって直流雑光Ｐを入力受光素子に入力する。正規の伝
送状態における中継器拗の入力信号対雑音電力比をＳ／
Ｎとすると、この接続時の信号対雑音電力比は（Ｓ −
” ） ／ （Ｎ ＋Ｊ８ＩＰ Ｂ ）となる。但し、
この式でｅは電子電荷（八ｔ×ｌｆ”クーロン）％Ｉア
は直流雑光Ｐによる光電流％Ｂは再生中継回路ダの人力
帯域幅である。ここで直流雑光Ｐを増加することによっ
てエアを増加させれば、信号対雑音電力比は誤り率測定
器／２で短時間に充分測定できるレベル、例えばａ（Ｌ
Ｅ以下に低下させることができる。In the figure, parts similar to those in FIG. 7 are given the same reference numerals. The signal power transmitted through the transmission line optical fiber 7 is
If the loss at one connection point r is α, then the light receiving element 3 has S−α
Further, DC noise P is input to the input light receiving element through the noise light input fiber 13. The input signal-to-noise power ratio of the repeater under normal transmission conditions is S/
N, the signal-to-noise power ratio in this connection is (S −
” ) / (N + J8IP B ).However,
In this equation, e is the electron charge (8t x lf" coulombs) %Ia is the photocurrent due to the DC noise P %B is the manual bandwidth of the regenerative repeater circuit. Here, increasing the DC noise P If the air is increased by
It can be lowered to below E.
このようにして誤り率を測定しながら第３図（ａ）、
（ｂ）に示すような方法でファイバ７とλとの相対位置
を調整する。第３図（に）は３軸調整（ｒ、ｙ、ｚ）の
場合、第３図（ｂ）はコ軸回転調整（ｚ、ｚ、θ）の場
合である。While measuring the error rate in this way, Fig. 3(a),
The relative position between the fiber 7 and λ is adjusted by the method shown in (b). FIG. 3(b) shows the case of three-axis adjustment (r, y, z), and FIG. 3(b) shows the case of co-axis rotational adjustment (z, z, θ).
第１図は、光中継器の信号対雑音電力比に対する符号誤
り率の関係を示している。ここで、光フアイバ端面の相
対位置の、調整前の位置での状態が点線Ａにあり、この
状態から光フアイバ端面の相対位置を変化させると符号
誤り率は直線りに沿って白色矢印のように変化し、符号
誤り率の最良点Ｐにまで至り、それ以上は相対位置の調
整如何に拘らず符号誤り率は低下しない。このときの入
力（，１）
信号対雑音電力比は点ＭＡとＢとの間で変化することが
わかる。この関係より符号誤り率が最良の場合に入力信
号対雑音電力比が最大、すなわち接続損失αが最小とな
ることがわかる。このことを利用してマニピュレータ等
の形態の制御回路／ｌにより符号誤り率が最良となるよ
うに両光ファイバの相対位置を調整する。FIG. 1 shows the relationship between the code error rate and the signal-to-noise power ratio of an optical repeater. Here, the state of the relative position of the optical fiber end face before adjustment is shown by dotted line A, and when the relative position of the optical fiber end face is changed from this state, the bit error rate will change along the straight line as shown by the white arrow. , and reaches the best point P of the code error rate, after which the code error rate does not decrease regardless of whether the relative position is adjusted. It can be seen that the input (,1) signal-to-noise power ratio at this time changes between points MA and B. From this relationship, it can be seen that when the bit error rate is the best, the input signal-to-noise power ratio is the maximum, that is, the connection loss α is the minimum. Taking advantage of this fact, the relative positions of both optical fibers are adjusted by a control circuit /l in the form of a manipulator or the like so that the bit error rate becomes the best.
第１表は本発明を実施した実験結果の実測値を示す。実
験に用いた光中継器は／、３μｍ帯、ｌ１００Ｍｂ／Ｓ
のもので、光ファイバはコア径７．乙μｍ、％径７．２
５μｍ１コア変心率八！％の単一モードファイバとした
。Table 1 shows actual measured values of experimental results in which the present invention was carried out. The optical repeater used in the experiment is /, 3 μm band, 100 Mb/S
The optical fiber has a core diameter of 7. Otsu μm, % diameter 7.2
5 μm 1 core eccentricity 8! % single mode fiber.
入力信号対雑音比は誤り率が／θ−６程度になるよう調
整した。接続回数７０回で平均０．／９ ｄＢの接続損
失が得られた。第１表に示した接続損失をまとめた第１
表
第６図は本発明の他の実施例であり、ここでは第２図示
の雑光入力用ファイバ／３を用いずに中継器入力受光素
子３に直流雑光Ｐを入力する。すなわち、直流光源１４
ｔを信号入力用光ファイバ２に近接して固定し、信号入
力用光ファイバλのクラッドモードとして受光素子３に
直流雑光Ｐを入力する。The input signal-to-noise ratio was adjusted so that the error rate was approximately /θ-6. The average number of connections is 0. A splice loss of /9 dB was obtained. Table 1 summarizes the splice losses shown in Table 1.
Table 6 shows another embodiment of the present invention, in which DC noise light P is input to the repeater input light receiving element 3 without using the noise light input fiber /3 shown in the second figure. That is, the DC light source 14
t is fixed close to the signal input optical fiber 2, and DC noise light P is input to the light receiving element 3 as the cladding mode of the signal input optical fiber λ.
この際、再現性よくクラッドモードを入力するために、
例えば第７図に示す冶具を用いる。この冶具は信号入力
用光ファイバλをはさみ込む形状の透明な材質のブロッ
ク／ｊ 、 ／！；’とブロック／ｊに埋め込まれた直
流光源としての電球／グとより成る。ここでブロックＢ
、 ／３′のファイバλをはさみ込む部分にファイバ
コと同一屈折率の液体を塗布しておけば効率よくクラッ
ドモードを注入することができる。At this time, in order to input the cladding mode with good reproducibility,
For example, a jig shown in FIG. 7 is used. This jig is a transparent block /j, /! that is shaped to sandwich the signal input optical fiber λ. ;' and a light bulb /g as a DC light source embedded in the block /j. Here block B
, /3', the cladding mode can be efficiently injected by applying a liquid having the same refractive index as that of the fiber to the portion where the fiber λ is sandwiched.
以上説明したように、本発明による光中継器と光ファイ
バの接続方法を用いることによって、接続点の損失を最
小に抑えることが可能になり、伝送路構成上余分なマー
ジンを見込む必要がなく、安定した伝送品質を得ること
ができる。また、本発明では中継器内に余分な回路を設
ける必要がない利点もある。As explained above, by using the method for connecting an optical repeater and optical fiber according to the present invention, it is possible to minimize the loss at the connection point, and there is no need to allow for extra margin in the transmission line configuration. Stable transmission quality can be obtained. Further, the present invention has the advantage that there is no need to provide an extra circuit within the repeater.
第１図は従来の光中継器と光ファイバとの接続方法の一
例を示す系統図、第２図は本発明の一実施例を示す系統
図、第３図（に）および（ｂ）は光フアイバ端面の相対
位置調整法のλ形態の説明図、第１図は光中継器の入力
信号対雑音電力比と符号誤り率との関係を示す特性曲線
図、第５図は本発明を実施した実験例における接続損失
の度数グラフ、第を図は本発明の他の実施例を示す系統
図、第７図は本発Ｆ！ＩＪのｆ［！＋１の実施例に用い
る冶具の一例を示す斜ＰＡ図である。
／・・・光中継器、 ２・・・信号入力用ファ
イバ、３・・・入力受光素子、 ダ・・・再生中継
回路、！・・発光素子、 乙・・・信号出力
用ファイバ、７・・・伝送路光ファイバ、 ざ・・・接
続点、９・・・モニタ回路、 ｌθ・・・モニ
タ信号引出し＠（、／ｌ・・・制御回路、 ／
２・・・誤り率測定器、／３・・・雑光入力用ファイバ
、／Ｆ・・・光源、／！； 、 ／！ｉ’・・・透明ブ
ロック。
特許出願人 日本電信電話公社
（９）Fig. 1 is a system diagram showing an example of a conventional method of connecting an optical repeater and an optical fiber, Fig. 2 is a system diagram showing an embodiment of the present invention, and Figs. Fig. 1 is a characteristic curve diagram showing the relationship between the input signal-to-noise power ratio and the bit error rate of an optical repeater, and Fig. 5 is an explanatory diagram of the λ form of the relative position adjustment method of the fiber end face. The frequency graph of connection loss in the experimental example, Figure 7 is a system diagram showing another embodiment of the present invention, and Figure 7 is the F! IJ's f [! It is a diagonal PA diagram which shows an example of the jig used for the +1 example. /...Optical repeater, 2...Signal input fiber, 3...Input light receiving element, Da...Regenerative repeater circuit,! ...Light emitting element, B...Signal output fiber, 7...Transmission line optical fiber, Z...Connection point, 9...Monitor circuit, lθ...Monitor signal extraction @(, /l・・・Control circuit, /
2...Error rate measuring device, /3...Miscellaneous light input fiber, /F...Light source, /! ; 、 /! i'...Transparent block. Patent applicant: Nippon Telegraph and Telephone Public Corporation (9)
Claims (1)
結合された信号入力用光ファイバと伝送路光ファイバと
を融着接続するにあたり、前記入力受光素子に直流雑光
を導き、前記光中継器の符号誤り率を測定しながら、前
記信号入力用光ファイバと伝送路光ファイバとの接続さ
れる端面の相対位置を調整し、前記光中継器の符号誤り
率が最良になる位置で前記信号入力用光ファイバと伝送
路光ファイバとの融着接続を行うことを特徴とする光中
継器用光ファイバのモニタ接続方法。When fusion-splicing the signal input optical fiber coupled to the input light-receiving element of the optical fiber receiver using optical fiber as a transmission medium and the transmission line optical fiber, direct current noise is guided to the input light-receiving element, and the optical While measuring the code error rate of the repeater, adjust the relative position of the end faces of the signal input optical fiber and the transmission line optical fiber to be connected, and adjust the position where the code error rate of the optical repeater is the best. A method for monitoring and connecting optical fibers for optical repeaters, characterized by performing fusion splicing between a signal input optical fiber and a transmission line optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19168381A JPS5895311A (en) | 1981-12-01 | 1981-12-01 | Monitor connecting method of optical fiber for optical repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19168381A JPS5895311A (en) | 1981-12-01 | 1981-12-01 | Monitor connecting method of optical fiber for optical repeater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5895311A true JPS5895311A (en) | 1983-06-06 |
Family
ID=16278711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19168381A Pending JPS5895311A (en) | 1981-12-01 | 1981-12-01 | Monitor connecting method of optical fiber for optical repeater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5895311A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6048006A (en) * | 1983-08-26 | 1985-03-15 | Sumitomo Electric Ind Ltd | Axial aligning device for optical fiber |
-
1981
- 1981-12-01 JP JP19168381A patent/JPS5895311A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6048006A (en) * | 1983-08-26 | 1985-03-15 | Sumitomo Electric Ind Ltd | Axial aligning device for optical fiber |
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