JPS61243409A - Fixing method for optical fiber lens assembly - Google Patents

Fixing method for optical fiber lens assembly

Info

Publication number
JPS61243409A
JPS61243409A JP60084133A JP8413385A JPS61243409A JP S61243409 A JPS61243409 A JP S61243409A JP 60084133 A JP60084133 A JP 60084133A JP 8413385 A JP8413385 A JP 8413385A JP S61243409 A JPS61243409 A JP S61243409A
Authority
JP
Japan
Prior art keywords
optical fiber
lens assembly
fiber lens
holding member
holder
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
JP60084133A
Other languages
Japanese (ja)
Inventor
Hideki Isono
秀樹 磯野
Kazuyuki Asanuma
浅沼　和志
Takashi Yokota
横田　隆
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 JP60084133A priority Critical patent/JPS61243409A/en
Publication of JPS61243409A publication Critical patent/JPS61243409A/en
Pending legal-status Critical Current

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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
    • G02B6/4236—Fixing or mounting methods of the aligned elements
    • G02B6/4237—Welding

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

PURPOSE:To easily machine and mount a rectangular prismatic holder by welding an optical fiber lens assembly to a fitting table by a laser through a holding member and the rectangular prismatic holder. CONSTITUTION:The cylindrical optical fiber lens assembly 1 is fitted in the axial core of the holding member 6 rotatably and the optical position of the assembly 1 adjusted above the fitting table 7. then while the assembly is held, the rectangular prismatic holder 11 is made parallel on the fitting table 7 so that vertical surfaces contact and clamp both flanks of the member 6. Then, the fitting table 7 and holder 11, holder 11 and member 6, and member 6 and assembly are laser-welded respectively. It is easy to machine the bottom surface and flanks of the holder 11 at right angles, and those flanks are bought into contact with the respective flanks of the member 6 extremely easily from both sides of the member 6.

Description

【発明の詳細な説明】 〔概要〕 光ファイバレンズアセンブルの光学的位置調整が終了し
た状態で、光ファイバレンズアセンブルを直接保持する
保持部材の両側面を、直方体ホルダで挟持し、光ファイ
バルンズアセンプルを保持部材、直方体ホルダを介して
取付台にレーザー溶接することにより、光ファイバレン
ズアセンブルを低コストで固定可能とする。[Detailed Description of the Invention] [Summary] After the optical position adjustment of the optical fiber lens assembly has been completed, both sides of the holding member that directly holds the optical fiber lens assembly are held between rectangular parallelepiped holders, and the optical fiber lens assembly is assembled. By laser welding the pull to the mounting base via the holding member and the rectangular parallelepiped holder, the optical fiber lens assembly can be fixed at low cost.

〔産業上の利用分野〕[Industrial application field]

本発明は、レンズと光ファイバとが所望に結合されてな
る光ファイバレンズアセンブルと、発光素子・受光素子
、或いは対向する他の光ファイバレンズアセンブルとを
光結合させるための、光ファイバレンズアセンブルの固
定方法に関する。The present invention provides an optical fiber lens assembly for optically coupling an optical fiber lens assembly in which a lens and an optical fiber are combined as desired, and a light emitting element, a light receiving element, or another opposing optical fiber lens assembly. Regarding the fixing method.

光ファイバレンズアセンブルは、第２図の如くに構成さ
れているのが一般である。An optical fiber lens assembly is generally constructed as shown in FIG.

第２図において、光ファイバ２の端末部は、例えばステ
ンレス鋼よりなる円筒形のフェルール３の軸心孔に挿入
接着され、フェルール３の端面と光ファイバ２の端面と
は、研磨等され平坦に仕上げられている。In FIG. 2, the end of the optical fiber 2 is inserted and bonded into the axial hole of a cylindrical ferrule 3 made of stainless steel, for example, and the end face of the ferrule 3 and the end face of the optical fiber 2 are polished or otherwise flattened. It is finished.

フェルール３は、円筒形のアセンブルホルダ５の軸心孔
の小径孔側に圧入され、小径孔と同心の大径孔側には、
レンズ（例えばドラムレンズ）４の球面が、軸心孔の段
付部に当接するように挿着されている。The ferrule 3 is press-fitted into the small diameter hole side of the axial hole of the cylindrical assembly holder 5, and the large diameter hole side concentric with the small diameter hole has a
The spherical surface of a lens (for example, a drum lens) 4 is inserted so as to abut against the stepped portion of the axial hole.

このように軸心孔の同心の小径孔側に、フェルール３が
挿入され、レンズ４の球面が軸心孔の段付部に当接する
ことにより、レンズ４の焦点が、光ファイバ２の端面位
置になるように、位置調整されて、光ファイバレンズア
センブル１を構成している。In this way, the ferrule 3 is inserted into the concentric small-diameter hole side of the axial hole, and the spherical surface of the lens 4 comes into contact with the stepped part of the axial hole, so that the focal point of the lens 4 is adjusted to the end face position of the optical fiber 2. The position is adjusted so that the optical fiber lens assembly 1 is constructed.

このような光ファイバレンズアセンブル１は、まず、発
光素子・受光素子、或いは対向する他の光ファイバレン
ズアセンブルを共通する取付台の所望の位置に固定し、
その後、光結合度が最良になるごとくに、発光素子・受
光素子、或いは対向する他の光ファイバレンズアセンブ
ルとの関係位置を調整して、取付台に固定するが一般で
ある。Such an optical fiber lens assembly 1 is constructed by first fixing a light emitting element, a light receiving element, or another opposing optical fiber lens assembly at a desired position on a common mounting base.
Thereafter, the relative position of the light emitting element, light receiving element, or other opposing optical fiber lens assembly is adjusted so as to obtain the best degree of optical coupling, and the lens is generally fixed to a mounting base.

この際、固定が容易な光ファイバレンズアセンブルの固
定方法が要求されている。At this time, there is a need for a method of fixing an optical fiber lens assembly that is easy to fix.

〔従来の技術〕[Conventional technology]

第３図は従来の光ファイバレンズアセンブルの固定方法
を示す斜視図であって、取付台７の上面には、図示して
ない発光素子・受光素子、或いは対向する他の光ファイ
バレンズアセンブルが固定されている。FIG. 3 is a perspective view showing a conventional method of fixing an optical fiber lens assembly, in which a light emitting element/light receiving element (not shown) or another opposing optical fiber lens assembly is fixed to the top surface of the mounting base 7. has been done.

６は金属材、例えばステンレス鋼よりなる角筒形の保持
部材で、軸心には、円筒状の光ファイバレンズアセンブ
ル１が回動自在に嵌入する軸心孔６Ａが設けられている
。Reference numeral 6 denotes a prismatic cylindrical holding member made of a metal material such as stainless steel, and an axial hole 6A into which the cylindrical optical fiber lens assembly 1 is rotatably fitted is provided at the axial center.

８は金属材よりなる模形のスペーサであって、その平面
視の寸法は、保持部材６の投影寸法よりも所望に大きい
角形である。Reference numeral 8 denotes a model spacer made of a metal material, and its dimension in plan view is a rectangular shape that is desirably larger than the projected dimension of the holding member 6.

この光ファイバレンズアセンブル１を取付台７に固定す
るには、まず、光ファイバレンズアセンブルｌを保持部
材６の軸心孔６Ａに嵌入する。そしてアセンブルホルダ
５の端部を微動台のアーム（図示せず）の先端に装着し
たチャックハンド（図示せず）等で把持し、微動台を操
作して発光素子・受光素子、或いは対向する他の光ファ
イバレンズアセンブルと光ファイバレンズアセンブル１
との光結合が最良になるごとくに、光ファイバレンズア
センブル１の高さ、左右の位置、及び上下、左右の傾き
を調整する。In order to fix this optical fiber lens assembly 1 to the mounting base 7, first, the optical fiber lens assembly 1 is fitted into the axial hole 6A of the holding member 6. Then, grasp the end of the assemble holder 5 with a chuck hand (not shown) attached to the tip of the arm (not shown) of the fine movement table, and operate the fine movement table to attach the light emitting element, the light receiving element, or the opposing device. Optical fiber lens assembly and optical fiber lens assembly 1
The height, lateral position, and vertical and horizontal inclinations of the optical fiber lens assembly 1 are adjusted so that the optical coupling with the optical fiber lens assembly 1 is optimized.

次に、光ファイバレンズアセンブル１を調整位置に固定
保持した状態で、スペーサ８を取付台７の上面に載せ、
取付台７上を摺動させて、傾斜面８Ａが保持部材６の下
方に位置する面に密接するように、保持部材６と取付台
７との間隙に挿入する。Next, with the optical fiber lens assembly 1 fixedly held at the adjustment position, the spacer 8 is placed on the top surface of the mounting base 7,
It is inserted into the gap between the holding member 6 and the mounting base 7 by sliding it on the mounting base 7 so that the inclined surface 8A comes into close contact with the surface located below the holding member 6.

この際保持部材６は光ファイバレンズアセンブル１を軸
として回動自在の状態である。At this time, the holding member 6 is in a state where it can freely rotate around the optical fiber lens assembly 1.

よって、保持部材６は傾斜面８Ａに密接する方向に回転
し、容易に傾斜面８Ａは保持部材６の下面に密接する。Therefore, the holding member 6 rotates in a direction in which it comes into close contact with the inclined surface 8A, and the inclined surface 8A easily comes into close contact with the lower surface of the holding member 6.

そして、アセンブルホルダ５と保持部材６の端面部分、
保持部材６の下周縁と傾斜面８＾、スペーサ８の下周縁
と取付台７とを、それぞれレーザー溶接して、光ファイ
バレンズアセンブル１を保持部材６．スペーサ８を介し
て取付台７に固定して　　　　　　　り。And the end face portions of the assemble holder 5 and the holding member 6,
The lower peripheral edge of the holding member 6 and the inclined surface 8^, and the lower peripheral edge of the spacer 8 and the mounting base 7 are laser welded, respectively, and the optical fiber lens assembly 1 is attached to the holding member 6. It is fixed to the mounting base 7 via the spacer 8.

いる。There is.

このように微小部分を加熱するレーザー溶接固　　　　
　　　゛定手段であるので、部材が熱変形することがな
く１．１、′ 光ファイバレンズアセンブル１の調整位置がずれ　　　
　　　　２券 ることがない。　　　　　　　　　　　　　　　　　　
　　　　　□・〔発明が解決しようとする問題点〕 しかしながら上記従来例による厚さの薄いスペーサ８の
傾斜面８Ａを均一に平坦に加工することが困難であり、
また、傾斜面８Ａが保持部材６の下面に密接せしめるこ
とが簡単でなく、固定コストが上昇するという問題点が
ある。Laser welding that heats minute parts in this way
Since it is a fixed means, the members will not be thermally deformed.1.
I never get two tickets.
□・[Problems to be solved by the invention] However, it is difficult to process the inclined surface 8A of the thin spacer 8 according to the above conventional example to be uniformly flat.
Furthermore, it is not easy to bring the inclined surface 8A into close contact with the lower surface of the holding member 6, resulting in an increase in fixing costs.

〔問題点を解決するための手段〕[Means for solving problems]

上記従来の問題点を解決するため本発明は、第１図のよ
うに、円筒状の光ファイバレンズアセンブル−を保持部
材６の軸心孔に回動自在に嵌太し、取付台７の上方で光
ファイバレンズアセンブル１の光学的位置調整を実施し
、光ファイバレンズアセンブル１を保持した状態で、垂
直面のそれぞれが保持部材６の両側面に密接し挟持する
如くに、直方体ホルダ１１を取付台７上に並列し、その
後、取付台７と直方体ホルダ１１、直方体ホルダ１１と
保持部材６、及び保持部材６と光ファイバレンズアセン
ブル１とを、それぞれレーザー溶接するようにしたもの
である。In order to solve the above conventional problems, the present invention, as shown in FIG. Adjust the optical position of the optical fiber lens assembly 1 at step 1, and while holding the optical fiber lens assembly 1, install the rectangular parallelepiped holder 11 so that each of its vertical surfaces closely contacts and clamps both sides of the holding member 6. They are arranged in parallel on a stand 7, and then the mounting stand 7 and the rectangular parallelepiped holder 11, the rectangular parallelepiped holder 11 and the holding member 6, and the holding member 6 and the optical fiber lens assembly 1 are laser welded, respectively.

〔作用〕[Effect]

上記本発明の手段によれば、直方体ホルダ１１を底面と
側面とを直角に加工することは容易であり、また、その
側面を保持部材６のそれぞれの側面に密接することは、
保持部材６の両側より当接すれば良く、極めて簡単であ
る。According to the means of the present invention, it is easy to process the rectangular parallelepiped holder 11 so that the bottom and side surfaces are perpendicular, and the side surfaces can be brought into close contact with the respective side surfaces of the holding member 6.
It is only necessary to abut from both sides of the holding member 6, which is extremely simple.

よって、光ファイバレンズアセンブル１を取付台７に、
低コストでレーザー溶接固定することができる。Therefore, the optical fiber lens assembly 1 is mounted on the mounting base 7,
It can be fixed by laser welding at low cost.

〔実施例〕〔Example〕

以下図示実施例により、本発明を具体的に説明する。な
お、全図を通じて同一符号は同一対象物を示す。The present invention will be specifically explained below with reference to illustrated examples. Note that the same reference numerals indicate the same objects throughout the figures.

第１図は本発明の１実施例の固定過程を示す斜視図であ
って、ｆａ）は溶接前の図、（ｂ）は溶接後の図である
。FIG. 1 is a perspective view showing the fixing process of an embodiment of the present invention, in which fa) is a view before welding, and (b) is a view after welding.

第１図において、直方体ホルダ１１は、金属、例えばス
テンレス綱よりなり、長さが、保持部材６の長さにほぼ
等しく、高さが保持部材６の高さよりも所望に低い直方
体状である。In FIG. 1, the rectangular parallelepiped holder 11 is made of metal, for example, stainless steel, and has a rectangular parallelepiped shape with a length substantially equal to the length of the holding member 6 and a height desirably lower than the height of the holding member 6.

光ファイバレンズアセンブル１を取付台７に固定するに
は、第１図（ａ）のように、まず、光ファイバレンズア
センブル１を保持部材６の軸心孔６Ａに嵌入する。そし
てアセンブルホルダ５の端部を微動台のアーム（図示せ
ず）の先端に装着したチャックハンド１０等で把持し、
微動台を操作して取付台７上に予め固定しである発光素
子・受光素子、或いは対向する他の光ファイバレンズア
センブルと光ファイバレンズアセンブル１との光結合が
最良になるごとくに、Ｘ軸、Ｚ軸及び光軸方向であるＹ
軸方向のずれ、傾きをそれぞれ調整する。In order to fix the optical fiber lens assembly 1 to the mounting base 7, the optical fiber lens assembly 1 is first fitted into the axial hole 6A of the holding member 6, as shown in FIG. 1(a). Then, the end of the assemble holder 5 is gripped with a chuck hand 10 or the like attached to the tip of the arm (not shown) of the fine movement table.
By operating the fine movement table, move the X-axis so that the optical coupling between the light-emitting element and light-receiving element pre-fixed on the mounting base 7, or the optical fiber lens assembly 1 with another opposing optical fiber lens assembly is optimal. , Y which is the Z axis and optical axis direction
Adjust the axial deviation and tilt respectively.

この際、光ファイバレンズアセンブルｌの軸心が、取付
台７の平面に並行するとは限らないので、保持部材６の
底面が、取付台７の上面に並行になるとは限らず、図の
如くに、それぞれの隅部は、取付台７より、ｄｏ、ｄ、
、ｄ、たけ浮いている。At this time, since the axis of the optical fiber lens assembly l is not necessarily parallel to the plane of the mount 7, the bottom surface of the holding member 6 is not necessarily parallel to the top surface of the mount 7, and as shown in the figure. , each corner is connected to the mounting base 7 by do, d,
, d, floating high.

また、光ファイバレンズアセンブル１を調整した位置に
チャックハンド１０で固定保持した状態で、保持部材６
は光ファイバレンズアセンブル１に対して回動自在であ
る。Further, with the optical fiber lens assembly 1 fixedly held at the adjusted position by the chuck hand 10, the holding member 6
is rotatable with respect to the optical fiber lens assembly 1.

次に、第１図（ｂ）のように、直方体ホルダ１１を取付
台７上に載せ、保持部材６の両側に置く。そして直方体
ホルダ１１の垂直面を保持部材６の側面に当接し、保持
部材６を挟持する如くにする。Next, as shown in FIG. 1(b), the rectangular parallelepiped holder 11 is placed on the mounting base 7 and placed on both sides of the holding member 6. Then, the vertical surface of the rectangular parallelepiped holder 11 is brought into contact with the side surface of the holding member 6, so that the holding member 6 is held therebetween.

この際、保持部材６は光ファイバレンズアセンブル１を
軸として回転して、直方体ホルダ１１の垂直面に保持部
材６の側面が密接する。At this time, the holding member 6 rotates around the optical fiber lens assembly 1, so that the side surface of the holding member 6 comes into close contact with the vertical surface of the rectangular parallelepiped holder 11.

その後、取付台７と直方体ボルダ１１、直方体ホルダ１
１と保持部材６、及び保持部材６のアセンブルホルダ５
と光ファイバレンズアセンブル１とを、それぞれレーザ
ー溶接する。その後、チャックハンド１０の保持を解除
する。After that, the mounting base 7, the rectangular parallelepiped boulder 11, the rectangular parallelepiped holder 1
1, holding member 6, and assembly holder 5 of holding member 6
and the optical fiber lens assembly 1 are laser welded, respectively. After that, the grip on the chuck hand 10 is released.

上述のように、保持部材６．直方体ホルダ１１を介して
光ファイバレンズアセンブル１を取付台７に固定すると
いう本発明は、直方体ホルダ１１の加工が容易で、且つ
直方体ホルダ１１の装着作業が簡単で、低コストな固定
方法である。As mentioned above, the retaining member 6. The present invention, in which the optical fiber lens assembly 1 is fixed to the mounting base 7 via the rectangular parallelepiped holder 11, is a low-cost fixing method in which the processing of the rectangular parallelepiped holder 11 is easy, the installation work of the rectangular parallelepiped holder 11 is easy, and the fixing method is low-cost. .

なお、従来のように保持部材６と取付台７との間にスペ
ーサを挿入しないので、従来よりもスペーサの厚さだけ
光ファイバレンズアセンブル１の固定高さを低くするこ
とができ、光デバイスを小形にすることができるという
メリットがある。In addition, since a spacer is not inserted between the holding member 6 and the mounting base 7 as in the conventional case, the fixing height of the optical fiber lens assembly 1 can be lowered by the thickness of the spacer than in the conventional case, and the optical device can be It has the advantage of being able to be made small.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、光ファイバレンズアセン
ブルを保持部材、直方体ホルダを介して、取付台７にレ
ーザー溶接することにより、直方体ホルダの加工が容易
で、且つ直方体ホルダの装着作業が簡単で、低コストで
ある等、実用上で優れた効果がある。As explained above, the present invention laser-welds the optical fiber lens assembly to the mounting base 7 via the holding member and the rectangular parallelepiped holder, thereby making it easy to process the rectangular parallelepiped holder and to easily attach the rectangular parallelepiped holder. It has excellent practical effects such as low cost.

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

第１図は本発明の１実施例の固定過程を示す斜視図であ
って、（ａ）は溶接前の図、（ｂｌは溶接後の図、 第２図は光ファイバレンズアセンブルの断面図、第３図
は従来の光ファイバレンズアセンブルの固定方法を示す
斜視図である。 図において、 １は光ファイバレンズアセンブル、 ２は光ファイバ、 ３はフェルール、 ４はレンズ、 ５はアセンブルホルダ、 ６は保持部材、 ７は取付台、 ８はスペーサ、 １１は直方体ホルダを示す。FIG. 1 is a perspective view showing the fixing process of an embodiment of the present invention, (a) is a view before welding, (bl is a view after welding, FIG. 2 is a sectional view of an optical fiber lens assembly, Fig. 3 is a perspective view showing a conventional method of fixing an optical fiber lens assembly. In the figure, 1 is an optical fiber lens assembly, 2 is an optical fiber, 3 is a ferrule, 4 is a lens, 5 is an assembly holder, and 6 is an assembly holder. A holding member, 7 is a mounting base, 8 is a spacer, and 11 is a rectangular parallelepiped holder.

Claims (1)

【特許請求の範囲】 円筒状の光ファイバレンズアセンブル（１）を保持部材
（６）の軸心孔に回動自在に嵌入し、取付台（７）の上
方で該光ファイバレンズアセンブルの光学的位置調整を
実施し、 該光ファイバレンズアセンブル（１）を保持した状態で
、垂直面のそれぞれが該保持部材の両側面に密接し挟持
する如くに、直方体ホルダ（１１）を該取付台（７）上
に並列し、 その後、該取付台と該直方体ホルダ、該直方体ホルダと
該保持部材、及び該保持部材と該光ファイバレンズアセ
ンブルとを、それぞれレーザー溶接すること特徴とする
光ファイバレンズアセンブルの固定方法。[Claims] A cylindrical optical fiber lens assembly (1) is rotatably fitted into the axial hole of the holding member (6), and the optical fiber lens assembly is mounted above the mounting base (7). After adjusting the position, and while holding the optical fiber lens assembly (1), place the rectangular parallelepiped holder (11) on the mounting base (7) so that each of the vertical surfaces is in close contact with both sides of the holding member. ), and then the mounting base and the rectangular parallelepiped holder, the rectangular parallelepiped holder and the holding member, and the holding member and the optical fiber lens assembly are laser welded, respectively. Fixing method.
JP60084133A 1985-04-19 1985-04-19 Fixing method for optical fiber lens assembly Pending JPS61243409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60084133A JPS61243409A (en) 1985-04-19 1985-04-19 Fixing method for optical fiber lens assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60084133A JPS61243409A (en) 1985-04-19 1985-04-19 Fixing method for optical fiber lens assembly

Publications (1)

Publication Number Publication Date
JPS61243409A true JPS61243409A (en) 1986-10-29

Family

ID=13822002

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60084133A Pending JPS61243409A (en) 1985-04-19 1985-04-19 Fixing method for optical fiber lens assembly

Country Status (1)

Country Link
JP (1) JPS61243409A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2737310A1 (en) * 1995-07-25 1997-01-31 Thomson Csf Semiconducteurs METHOD AND DEVICE FOR COUPLING BETWEEN AN OPTICAL FIBER AND A LASER OR A PHOTODETECTOR

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2737310A1 (en) * 1995-07-25 1997-01-31 Thomson Csf Semiconducteurs METHOD AND DEVICE FOR COUPLING BETWEEN AN OPTICAL FIBER AND A LASER OR A PHOTODETECTOR
WO1997005513A1 (en) * 1995-07-25 1997-02-13 Thomson-Csf Semiconducteurs Specifiques Method and device for coupling an optical fibre to a laser or photodetector

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