JPS59177503A - Multimode/single mode converter - Google Patents

Multimode/single mode converter

Info

Publication number
JPS59177503A
JPS59177503A JP5154583A JP5154583A JPS59177503A JP S59177503 A JPS59177503 A JP S59177503A JP 5154583 A JP5154583 A JP 5154583A JP 5154583 A JP5154583 A JP 5154583A JP S59177503 A JPS59177503 A JP S59177503A
Authority
JP
Japan
Prior art keywords
single mode
multimode
fiber
core
optical communication
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
Application number
JP5154583A
Other languages
Japanese (ja)
Inventor
Masakazu Mori
正和 森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5154583A priority Critical patent/JPS59177503A/en
Publication of JPS59177503A publication Critical patent/JPS59177503A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/14Mode converters

Abstract

PURPOSE:To relieve the strict requirements for parts in a single mode optical communication system and to reduce cost by forming the part where the diameter of the core of an optical fiber constituting in contg. a core and a clad enclosing said core is gradually changed. CONSTITUTION:The diameter of a core 21 changes gradually from, d1, for example, 50mum, to d2, for example, 10mum. The core diameter of a multimode fiber is large and the core diameter of a single mode fiber is small and therefore the multimodes are gradually changed to a single mode in such a fiber from left side to right side in the figure. Thus the fiber has a multimode/single mode change-over function. If such multimode/single mode converter is adapted in an optical communication systme, the strict requirements for the parts are relieved and therefore the cost of the optical communication system is reduced.

Description

【発明の詳細な説明】 発明の技術分野 本発明は光フアイバ技術に関する。[Detailed description of the invention] Technical field of invention FIELD OF THE INVENTION This invention relates to fiber optic technology.

技術の背景 近年、光ファイバを利用した光通信システムは極めて急
ピッチで実用化されつつある。このような光ファイバの
伝播モードとして、シングルモードとマルチモードとが
あシ、シングルモードファイバのコア径は小さくたとえ
ば10μm程度であるのに対し、マルチモードファイバ
のコア径は大きくたとえば50μm程度である。
Background of the Technology In recent years, optical communication systems using optical fibers are being put into practical use at an extremely rapid pace. The propagation modes of such optical fibers include single mode and multimode.The core diameter of single mode fiber is small, for example, about 10 μm, whereas the core diameter of multimode fiber is large, for example, about 50 μm. .

従来のシングルモード光通信システムにおいては、装置
−装置間をすべてシングルモードファイバで接続するか
、あるいは受信側の二部のみをマルチモードファイバで
構成していた。いずれにしても送信側ではすべてシング
ルモードファイバが使用されていた。
In conventional single-mode optical communication systems, devices are all connected using single-mode fibers, or only two sections on the receiving side are configured with multi-mode fibers. In any case, all single-mode fibers were used on the transmitting side.

しかしながら、シングルモードファイバハ上述のごとく
マルチモードファイバに比べてコア径が小さく、この結
果、光源、合波器、コネクタ、光減衰器等の部品は厳し
い寸法精度、光/電気特性が要求される。
However, as mentioned above, single-mode fibers have a smaller core diameter than multi-mode fibers, and as a result, components such as light sources, multiplexers, connectors, and optical attenuators require strict dimensional accuracy and optical/electrical characteristics. .

発明の目的 本発明の目的は、シングルモード光通信システムにおけ
る上述の部品に対する厳しい寸法精度。
OBJECTS OF THE INVENTION It is an object of the invention to provide strict dimensional accuracy for the above-mentioned components in single-mode optical communication systems.

光/電気特性等を緩和し、延いては光通信システムのコ
スト低減を計ることにある。
The objective is to reduce the optical/electrical characteristics, etc., and ultimately reduce the cost of optical communication systems.

発明の構成 上述の目的を達成するために、本発明は新規なマルチモ
ード/シングルモード変換器を提供し、これにより、シ
ングルモード光通信システムにおける送信側をマルチモ
ードファイバにより構成することを可能にしたものであ
る。
Arrangement of the Invention In order to achieve the above-mentioned objects, the present invention provides a novel multimode/single mode converter, which allows the transmission side in a single mode optical communication system to be constructed by a multimode fiber. This is what I did.

発明の実施例 以下、図面により本発明を説明する。Examples of the invention The present invention will be explained below with reference to the drawings.

第1図は一般的なシングルモード光通信システムを示す
ブロック回路図である。第1図において、1−1.1−
2は送信器、2は送信器1−1゜1−2の光信号を結合
する合波器、3は分波器。
FIG. 1 is a block circuit diagram showing a general single mode optical communication system. In Figure 1, 1-1.1-
2 is a transmitter, 2 is a multiplexer that combines the optical signals of transmitters 1-1 and 1-2, and 3 is a demultiplexer.

4−1.4−2は分波された光信号を受信する受信器で
ある。LDFはライン分布フレームであって、これらラ
イン分布フレーム間、すなわち装置はシングルモードフ
ァイバSF1によって結合されている。送信側ではシン
グルモードファイバSF2〜SF4が用いられ、送信側
ではマルチモードファイバMF1〜MIi’、が用いら
れている。従って、送信側では、各装置とシングルモー
ドファイバSF2〜SF4との間を結合するコネクタ8
1〜S6はシングルモード型であり、受信側では、各装
置とマルチモードファイバMF 、〜IvIF3との間
を結合するコネクタM1〜M6はマルチモードである。
4-1 and 4-2 are receivers that receive the demultiplexed optical signals. The LDF is a line distribution frame, and these line distribution frames, ie, devices, are coupled by a single mode fiber SF1. Single mode fibers SF2 to SF4 are used on the transmitting side, and multimode fibers MF1 to MIi' are used on the transmitting side. Therefore, on the transmitting side, connector 8 connects each device to single mode fibers SF2 to SF4.
1 to S6 are single mode type, and on the receiving side, connectors M1 to M6 connecting each device to multimode fibers MF and -IvIF3 are multimode.

つます、装置−装置間がシングルモードファイバSF、
 テgRされているために、少ガくとも送信側はシング
ルモードファイバが用いられることになる。どのように
、シングルモードファイバを多く使用すれば、コネクタ
等の部品に対して厳しい寸法精度、光/電気特性等が要
求され、この結果、システムのコストが上昇することに
なる。
First, the device-to-device connection is a single-mode fiber SF.
Since it is TegR, at least a single mode fiber will be used on the transmitting side. However, if a large number of single mode fibers are used, strict dimensional accuracy, optical/electrical characteristics, etc. are required for parts such as connectors, and as a result, the cost of the system increases.

本発明者は第1図に示す光通信システムの送信側におい
てシングルモードファイバの使用をマルチモードファイ
バの使用に変更することを可能にするために、マルチモ
ード/シングルモード変換器を開発した。
The present inventor developed a multimode/single mode converter in order to make it possible to change the use of a single mode fiber to the use of a multimode fiber on the transmission side of the optical communication system shown in FIG.

第2図は本発明に係るマルチモード/シングルモード変
換器の一実施例を示す縦断面図である。
FIG. 2 is a longitudinal sectional view showing an embodiment of the multimode/single mode converter according to the present invention.

第2図において、21はコア、22はクラッド、23は
被覆を示す。コア21の直径はdまたとえば50μmか
らdまたとえば10μmに徐々に変化している。上述し
たごとく、マルチモードファイバのコア径ハ太きく、シ
ングルモードファイ、6のコア径は小さい。つまり、第
2図に示すファイバは、図示左側から右側へ、マルチモ
ードからシングルモードへ徐々に変化していることを示
している。
In FIG. 2, 21 is a core, 22 is a cladding, and 23 is a coating. The diameter of the core 21 gradually changes from d, for example, 50 μm to d, for example, 10 μm. As described above, the core diameter of the multimode fiber is large, and the core diameter of the single mode fiber 6 is small. In other words, the fiber shown in FIG. 2 shows a gradual change from multimode to single mode from the left side to the right side of the figure.

従って、第2図に示すファイバはマルチモード/シング
ルモード変換機能を有することになる。
Therefore, the fiber shown in FIG. 2 has a multimode/single mode conversion function.

第3図は第2図のマルチモード/シングルモード変換器
を第1図の光通信システムに適用した例を示す。すなわ
ち、マルチモード/シングルモード変換器5が第1図に
対して付加されている。この結果、シングルモードファ
イバSF2. sF3.+o代シにマルチモードファイ
バ■゛4.■゛5が用いられ、また、シングルモードコ
ネクタ81〜S5の代シにマルチモードコネクタM7〜
M11が用いられている。
FIG. 3 shows an example in which the multimode/single mode converter of FIG. 2 is applied to the optical communication system of FIG. 1. That is, a multimode/single mode converter 5 has been added to FIG. As a result, single mode fiber SF2. sF3. +Multi-mode fiber in O position ■゛4. ■゛5 is used, and multimode connectors M7 to M7 are used instead of single mode connectors 81 to S5.
M11 is used.

従って、送信側においそは、部品に対する厳しい寸法精
度、光/電気特性の要求が緩和される。
Therefore, on the transmitting side, strict requirements for dimensional accuracy and optical/electrical characteristics for components are relaxed.

発明の詳細 な説明したように本発明に係るマルチモード/シングル
モード変換器を光通信システムに適用すると、部品に対
する厳しい要求が緩和されるので、光通信システムのコ
スト低減に役立つものである。
As described in detail, when the multi-mode/single-mode converter according to the present invention is applied to an optical communication system, the stringent requirements for components are relaxed, thereby helping to reduce the cost of the optical communication system.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は一般的なシングルモード光通信システムを示す
ブロック回路図、第2図は本発明に係るマルチモード/
シングルモード変換器の一実施例を示す縦断面図、第3
図は第2図のマルチモード/シングルモード変換器を第
1図の光通信システムに適用した例を示す回路図である
。 21:コア、22:クラッド、23:被覆。 特許出願人 富士通株式会社 特許出願代理人 弁理士 青 木    朗 弁理士西舘和之 弁理士 内 1)幸 男 弁理士 山 口 昭 之
FIG. 1 is a block circuit diagram showing a general single-mode optical communication system, and FIG. 2 is a multi-mode optical communication system according to the present invention.
Vertical sectional view showing one embodiment of a single mode converter, No. 3
The figure is a circuit diagram showing an example in which the multimode/single mode converter of FIG. 2 is applied to the optical communication system of FIG. 1. 21: core, 22: cladding, 23: coating. Patent applicant Fujitsu Limited Patent agent Akira Aoki Patent attorney Kazuyuki Nishidate Patent attorney 1) Yukio Patent attorney Akira Yamaguchi

Claims (1)

【特許請求の範囲】[Claims] 1、 コアおよび該コアを囲むクラッドを含んで構成さ
れる光ファイバにおいて、前記コアの直径を徐々に変化
させた部分を形成したことを特徴とスルマルチモード/
シングルモー1’ 変換器。
1. An optical fiber comprising a core and a cladding surrounding the core, characterized in that a portion is formed in which the diameter of the core is gradually changed.
Single Mo 1' converter.
JP5154583A 1983-03-29 1983-03-29 Multimode/single mode converter Pending JPS59177503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5154583A JPS59177503A (en) 1983-03-29 1983-03-29 Multimode/single mode converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5154583A JPS59177503A (en) 1983-03-29 1983-03-29 Multimode/single mode converter

Publications (1)

Publication Number Publication Date
JPS59177503A true JPS59177503A (en) 1984-10-08

Family

ID=12889987

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5154583A Pending JPS59177503A (en) 1983-03-29 1983-03-29 Multimode/single mode converter

Country Status (1)

Country Link
JP (1) JPS59177503A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484878A2 (en) * 1990-11-05 1992-05-13 Nippon Sheet Glass Co., Ltd. Wye-branching optical circuit
FR2815421A1 (en) * 2000-10-16 2002-04-19 France Telecom Optical collimator for monomode fibre includes two sections expanding and maintaining optical mode within fibre
EP1153324B1 (en) * 1999-02-19 2003-08-20 Blazephotonics Limited Photonic crystal fibres
CN106940247A (en) * 2015-09-21 2017-07-11 爱斯福公司 Method for carrying out the multimodes emitting system of OTDR measurements to multiple optical fibre array DUT and carrying out the measurement
US11131810B2 (en) 2019-06-17 2021-09-28 Cailabs Fixing process for a single-mode optical fiber and a multimode optical fiber, optical coupling equipment
US11971431B2 (en) 2020-05-20 2024-04-30 Kabushiki Kaisha Nihon Micronics Optical probe, optical probe array, optical probe card, and method of manufacturing optical probe

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0484878A2 (en) * 1990-11-05 1992-05-13 Nippon Sheet Glass Co., Ltd. Wye-branching optical circuit
EP1153324B1 (en) * 1999-02-19 2003-08-20 Blazephotonics Limited Photonic crystal fibres
FR2815421A1 (en) * 2000-10-16 2002-04-19 France Telecom Optical collimator for monomode fibre includes two sections expanding and maintaining optical mode within fibre
WO2002033463A1 (en) * 2000-10-16 2002-04-25 France Telecom Optical collimator for monomode fibres, monomode fibre with integrated collimator and method for making same
US7155096B2 (en) 2000-10-16 2006-12-26 France Telecom Optical collimator for monomode fibers; monomode fiber with integrated collimator and method for making same
CN106940247A (en) * 2015-09-21 2017-07-11 爱斯福公司 Method for carrying out the multimodes emitting system of OTDR measurements to multiple optical fibre array DUT and carrying out the measurement
CN106940247B (en) * 2015-09-21 2020-09-22 爱斯福公司 Multimode transmitting system for OTDR measurement of multi-fiber array equipment
US11131810B2 (en) 2019-06-17 2021-09-28 Cailabs Fixing process for a single-mode optical fiber and a multimode optical fiber, optical coupling equipment
US11971431B2 (en) 2020-05-20 2024-04-30 Kabushiki Kaisha Nihon Micronics Optical probe, optical probe array, optical probe card, and method of manufacturing optical probe

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