JPH02171705A - Wide band optical fiber coupler and its manufacture - Google Patents
Wide band optical fiber coupler and its manufactureInfo
- Publication number
- JPH02171705A JPH02171705A JP32603588A JP32603588A JPH02171705A JP H02171705 A JPH02171705 A JP H02171705A JP 32603588 A JP32603588 A JP 32603588A JP 32603588 A JP32603588 A JP 32603588A JP H02171705 A JPH02171705 A JP H02171705A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- optical fiber
- fiber coupler
- wide band
- broadband
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 100
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 65
- 230000008878 coupling Effects 0.000 claims abstract description 39
- 238000010168 coupling process Methods 0.000 claims abstract description 39
- 238000005859 coupling reaction Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 6
- 239000000758 substrate Substances 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000003313 weakening effect Effects 0.000 abstract 1
- 238000003466 welding Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 230000004927 fusion Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
- G02B6/2835—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、光通信システム等において光信号の分岐等に
用いられる光ファイバカップラに係り、特に光分岐比の
波長依存性の少ない広帯域光ファイバカップラ及びその
製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical fiber coupler used for branching optical signals in optical communication systems, etc., and particularly relates to a broadband optical fiber coupler whose optical branching ratio is less dependent on wavelength. The present invention relates to a coupler and a method for manufacturing the same.
（従来の技術）
広帯域光ファイバカップラは、光ファイバカップラの中
でもその光分岐比の波長依存性が少なく、光信号の分岐
に適し、光源の波長のばらつきへの対応性や、複数の波
長の分岐への対応性に優れている。このような、広帯域
光ファイバカップラは、インターナショナルアプリケイ
ジョンナンバーＰＣＴ／ＧＢ８６１００４４５に示され
ているように、主に２本の光ファイバのうちの１本を予
め延伸することなどによりなる、２本の光ファイバの非
対称性を利用することによって実現されている。(Prior art) Among optical fiber couplers, broadband optical fiber couplers have less dependence on wavelength in their optical branching ratio, and are suitable for branching optical signals. Excellent compatibility with Such a broadband optical fiber coupler, as shown in the International Application Number PCT/GB86100445, is mainly made by pre-drawing one of the two optical fibers. This is achieved by taking advantage of the asymmetry of optical fibers.
第２図は、従来の広帯域光ファイバカップラの光結合部
の構造図である。第２図において、ｌａ。FIG. 2 is a structural diagram of an optical coupling section of a conventional broadband optical fiber coupler. In FIG. 2, la.
１ｂは単一モード光ファイバ（以下、光ファイバという
。）、２ａ、２ｂはそれらのコア、３ａ。1b is a single mode optical fiber (hereinafter referred to as optical fiber), 2a and 2b are their cores, and 3a.
３ｂはクラッド、４ ａは単一モード光ファイバ１ａ、
ｌｂが互いに融着、延伸された融着延伸部である。従来
の広帯域光ファイバカップラを製造するにあたっては、
光結合部を非対称構造とするために、上記したように２
本の光ファイバを融着する前に、予め１本の光ファイバ
のみを延伸しておき、しかる後２本の光ファイバｌａ、
ｌｂを融着し、この融着部近傍のみを延伸する方法を採
用していた。3b is a cladding, 4a is a single mode optical fiber 1a,
lb is a fused and drawn portion that is fused and drawn to each other. In manufacturing conventional broadband optical fiber couplers,
In order to make the optical coupling part asymmetrical structure, as mentioned above, 2
Before fusing the optical fibers together, only one optical fiber is stretched in advance, and then two optical fibers la,
A method was adopted in which 1.5 lbs. was fused and only the vicinity of this fused portion was stretched.
第３図は、光結合部が上記したような非対称構造を有す
る従来の広帯域光ファイバカップラと基本的な対称構造
をなす対称性光ファイバカップラの光分岐比の波長依存
性を示す図である。FIG. 3 is a diagram showing the wavelength dependence of the optical branching ratio of a conventional broadband optical fiber coupler whose optical coupling part has an asymmetric structure as described above and a symmetric optical fiber coupler whose optical coupling part has a basically symmetric structure.
第３図中、実線ａで示すように、基本的な対称性光ファ
イバカップラの光分岐比は、光信号の波長により０から
１００％の間、を周期的に変化するのに対し、従来の広
帯域光ファイバカップラは、２本の光ファイバの伝搬定
数の相違を利用して、光分岐比の最大値を１００％未満
の特定の値にすることにより、その近傍での光分岐比の
平坦性を利用するものである。第１図中実線すで示す波
形はその一例で、波長１．３μｍで光分岐比５０％の広
帯域光ファイバカップラの特性であり、実！１ｊｌａの
対称性光ファイバカップラの特性と比較し、前記波長付
近での光分岐比の変化が平坦化していることがわかる。As shown by the solid line a in Figure 3, the optical branching ratio of a basic symmetric optical fiber coupler changes periodically between 0 and 100% depending on the wavelength of the optical signal, whereas in the conventional A broadband optical fiber coupler uses the difference in the propagation constants of two optical fibers to set the maximum value of the optical branching ratio to a specific value less than 100%, thereby improving the flatness of the optical branching ratio in the vicinity. It uses The waveform shown by the solid line in Figure 1 is an example of this, and is the characteristic of a broadband optical fiber coupler with a wavelength of 1.3 μm and an optical branching ratio of 50%. Compared with the characteristics of a symmetrical optical fiber coupler of 1jla, it can be seen that the change in the optical branching ratio near the wavelength is flattened.
（発明が解決しようとする課題）
しかしながら、上記従来の広帯域光ファイバカップラは
、光分岐比の波長依存性の周期を変化させるものではな
いので、周期性を少なくすることにより、光分岐比の平
坦化を達成することができない。(Problem to be Solved by the Invention) However, since the conventional broadband optical fiber coupler described above does not change the period of the wavelength dependence of the optical branching ratio, it is possible to flatten the optical branching ratio by reducing the periodicity. cannot achieve this goal.
従って、従来の広帯域光ファイバカップラは、光結合度
周波数依存性の周期を大きく変化させることができず、
光分岐比の波長依存性の平坦度はこの周期の幅に制限さ
れてしまうという問題点を有していた。Therefore, conventional broadband optical fiber couplers cannot significantly change the period of the frequency dependence of the degree of optical coupling.
There was a problem in that the flatness of the wavelength dependence of the optical branching ratio was limited by the width of this period.
本発明は、かかる事情に鑑みてなされたものであり、そ
の目的は、従来の広帯域光ファイバカップラの光分岐比
の波長依存性をさらに低減することにより、光分岐比の
任意性、広帯域性に優れ、光過剰損失が少なく、信頼性
が高く安価な広帯域光ファイバカップラを提供すること
、並、びにこのような広帯域光ファイバカップラを容易
かつ安価に、しかも精度よく製造する方法を提供するこ
とにある。The present invention has been made in view of the above circumstances, and its purpose is to further reduce the wavelength dependence of the optical branching ratio of conventional broadband optical fiber couplers, thereby improving the arbitrariness and broadband performance of the optical branching ratio. To provide an excellent broadband optical fiber coupler with low excess optical loss, high reliability, and low cost, and also to provide a method for manufacturing such a broadband optical fiber coupler easily, inexpensively, and with high precision. be.
（課題を解決するための手段）
上記目的を達成するため、請求項（１）では、互いに異
なる伝搬定数を有する２本の光ファイバにおける、それ
ぞれ等しい延伸部で延伸された延伸部を互いに融着延伸
してなる光結合部を備えた。(Means for Solving the Problems) In order to achieve the above object, in claim (1), two optical fibers having mutually different propagation constants, each of which is stretched with the same length, are fused to each other. It is equipped with an optical coupling section formed by stretching.
また、請求項（２）では、請求項（１）における２本の
光ファイバの異なる伝搬定数を光ファイバのコア径また
はコアの屈折率とした。Further, in claim (2), the different propagation constants of the two optical fibers in claim (1) are defined as the core diameter of the optical fiber or the refractive index of the core.
また、請求項（３）では、光信号を分岐する光結合部を
備えた広帯域光ファイバカップラの製造方法において、
互いに異なる伝搬定数を有する２本の光ファイバを等し
い延伸部でそれぞれ延伸した後、これらの延伸部を互い
に融着し、しかる後さらにこの融着部を延伸するように
した。Moreover, in claim (3), in the manufacturing method of a broadband optical fiber coupler equipped with an optical coupling part that branches an optical signal,
After two optical fibers having mutually different propagation constants were drawn in equal stretching sections, these stretched sections were fused together, and then this fused section was further stretched.
また、請求項（４）では請求項（３）における２本の光
ファイバの異なる伝搬定数を光ファイバのコア径または
コアの屈折率とした。Further, in claim (4), the different propagation constants of the two optical fibers in claim (3) are defined as the core diameter of the optical fiber or the refractive index of the core.
（作用） 以下に、本発明による作用を説明する。(effect) The effects of the present invention will be explained below.
光ファイバカップラにおいて、光信号の分岐は光結合部
で行なわれるが、その機構は光ファイバとしての２個の
導波路間のモード結合作用として説明される。従って、
光ファイバカップラにおける延伸とは、基本的には、二
つの導波路をモード結合させ、その結合係数及び結合長
を変化させるために行なわれることになる。しかし、一
般的に導波路間のモード結合はこれらの結合係数と結合
長に依存した波長依存性を生じる。これが、光ファイバ
カップラにおいて、光結合度が波長に対して周期的に変
化する原因である。従って、逆に実質的な結合長を周波
数によって連続的に変化させることができれば、この光
結合度の波長依存性を緩和できることになる。In an optical fiber coupler, optical signals are branched at an optical coupling section, and the mechanism thereof can be explained as a mode coupling effect between two waveguides as optical fibers. Therefore,
Stretching in an optical fiber coupler is basically performed to mode-couple two waveguides and change their coupling coefficient and coupling length. However, in general, mode coupling between waveguides causes wavelength dependence that depends on the coupling coefficient and coupling length. This is the reason why the degree of optical coupling changes periodically with respect to wavelength in an optical fiber coupler. Therefore, if the effective coupling length can be changed continuously depending on the frequency, the wavelength dependence of the degree of optical coupling can be alleviated.
即ち、互いに伝搬定数の異なる２本の光ファイバを用い
ることによって、光結合部の非対称性を実現できる。さ
らに、これら２本の光ファイバを予め等しい延伸部で延
伸した後に融着を行なえば、テーバ形状領域の長い光結
合部が形成され、テーバ・ベロシティ・カップラと呼ば
れる方向性結合器と似た構造になり、光結合の波長依存
性を緩和することができる。That is, by using two optical fibers with mutually different propagation constants, the asymmetry of the optical coupling portion can be realized. Furthermore, if these two optical fibers are drawn in advance with equal stretching parts and then fused together, an optical coupling part with a long Taper-shaped region is formed, which has a structure similar to a directional coupler called a Taber velocity coupler. This makes it possible to alleviate the wavelength dependence of optical coupling.
従って、請求項（１）または請求項（２）の広帯域光フ
ァイバカップラによれば、光結合度波長依存性の周期性
を緩和できる。Therefore, according to the broadband optical fiber coupler of claim (1) or claim (2), the periodicity of the wavelength dependence of the degree of optical coupling can be alleviated.
また、請求項（３）または請求項（４）の製造方法によ
れば、伝搬定数の互いに異なる２本の光ファイバを用い
、これら２本の光ファイバを予め等しい延伸部で延伸し
た後に、互いにこれら延伸部を融着することにより、こ
の融着部の光フアイバ形状が対称となり、かつ径が減少
しているため、融着による光ファイバの変形が少なく、
シかも、テーバ状の光結合部を長く形成できる。Further, according to the manufacturing method of claim (3) or claim (4), two optical fibers having different propagation constants are used, and after these two optical fibers are stretched in the same stretching section in advance, By fusing these stretched parts, the shape of the optical fiber at the fused part becomes symmetrical and the diameter is reduced, so there is less deformation of the optical fiber due to fusion.
Additionally, the tapered optical coupling portion can be formed long.
（実施例）
第１図は、本発明の一実施例を示す広帯域光ファイバカ
ップラ１０の斜視図である。本実施例においては、比屈
折率Δ−０，３％で、コア径が９．２μｍ及び９．５μ
ｍと、互いに伝搬定数の異なる２本の単一モード光ファ
イバを用いて、本発明による広帯域光ファイバカップラ
を製造した。(Embodiment) FIG. 1 is a perspective view of a broadband optical fiber coupler 10 showing an embodiment of the present invention. In this example, the relative refractive index is Δ-0.3%, and the core diameters are 9.2 μm and 9.5 μm.
A broadband optical fiber coupler according to the present invention was manufactured using two single mode optical fibers having different propagation constants.
第１図において、１１ａはコア径が９．２μｍ１１１ｂ
はコア径が９．５μｍの（単一モード）光ファイバ、１
２は光信号の分岐が行なわれる光結合部で、光ファイバ
ｌｌａ、ｌｌｂが予め等しい延伸部で延伸された延伸部
（以下、ブリ延伸部という。）同士を融着し、さらに延
伸して形成している。１３は石英ガラス基板、１４は光
結合部１２を石英ガラス基板１３に固定した固定部、１
５は光結合部１２が固定された石英ガラス基板１３が収
納される金属ケースである。In Figure 1, 11a has a core diameter of 9.2μm111b
is a (single mode) optical fiber with a core diameter of 9.5 μm, 1
Reference numeral 2 denotes an optical coupling part where the optical signal is branched, and is formed by fusing the stretched parts (hereinafter referred to as "Buri stretched parts") in which the optical fibers lla and llb have been stretched with equal stretching parts in advance, and then stretching them. are doing. 13 is a quartz glass substrate; 14 is a fixing part in which the optical coupling part 12 is fixed to the quartz glass substrate 13;
Reference numeral 5 denotes a metal case in which a quartz glass substrate 13 to which an optical coupling section 12 is fixed is housed.
次に、この広帯域光ファイバカップラの製造方法を説明
する。Next, a method of manufacturing this broadband optical fiber coupler will be explained.
まず、予め酸水素バーナ−（以下、バーナーという。）
を用い、バーナーを光ファイバ１１ａ。First, use an oxyhydrogen burner (hereinafter referred to as a burner).
The burner is connected to the optical fiber 11a.
１１ｂの長手方向に振りながらそれぞれ等しい延伸部で
延伸し、長さ８鰭のブリ延伸部を光ファイバｌｌａ、ｌ
ｌｂの各々に形成する。While swinging in the longitudinal direction of 11b, the stretched parts are stretched at the same length, and the stretched parts of 8 fins are connected to optical fibers lla and l.
Form each lb.
次に、この２本のコア径の異なる光ファイバ１１ａ、ｌ
ｌｂのブリ延伸部を互いにバーナーにより融着し、続け
てバーナーの火力を弱め、バーナーを光ファイバｌｌａ
、ｌｌｂの長手方向に振りながらブリ延伸部付近を、光
結合度のピークが１．３μｍ程度になるまで延伸し、光
結合部１２を作製した。Next, these two optical fibers 11a and l having different core diameters are
lb stretched parts are fused to each other with a burner, then the firepower of the burner is weakened, and the burner is connected to an optical fiber lla.
, ILB was stretched in the vicinity of the stretched portion while shaking it in the longitudinal direction until the peak of the degree of optical coupling reached about 1.3 μm, thereby producing the optical coupling portion 12.
これを石英ガラス基板１３に固定し、金属ケース１５に
収納して広帯域光ファイバカップラとした。This was fixed to a quartz glass substrate 13 and housed in a metal case 15 to form a broadband optical fiber coupler.
第４図は、このように製造された本発明による広帯域光
ファイバカップラの光結合部１２を模式的に示した構造
図である。第４図において、１１ａ、ｌｌｂは光ファイ
バ、１ｌａ−１，１１ｂ−１はそれらのコア、１ｌａ−
２，１ｌｂ−２はクラッド、１２ａはブリ延伸部、１２
ｂは融着延伸部である。第４図から明らかなように、本
発明に係る光結合部１１は、第２図に示した従来の広帯
域光ファイバカップラの光結合部に比較し、光ファイバ
のテーパ形状領域が対称形状となっており、かつその長
さは２倍以上となっている。FIG. 4 is a structural diagram schematically showing the optical coupling section 12 of the broadband optical fiber coupler according to the present invention manufactured in this manner. In FIG. 4, 11a and llb are optical fibers, 1la-1 and 11b-1 are their cores, and 1la-
2.1lb-2 is the cladding, 12a is the bristle extension part, 12
b is a fused and stretched portion. As is clear from FIG. 4, in the optical coupling section 11 according to the present invention, the tapered region of the optical fiber has a symmetrical shape compared to the optical coupling section of the conventional broadband optical fiber coupler shown in FIG. and its length has more than doubled.
この広帯域光ファイバカップラの過剰損失は、０．２ｄ
Ｂと低損失であった。これは、本実施例では、伝搬定数
の互いに異なる光ファイバを用いることにより、２本の
光ファイバｌｌａ、ｌｌｂのブリ延伸部１２ａの長さ（
本実施例では８ｍｍ）が同じであるため、融着時のおけ
る融着部の光フアイバ形状が対称となり、かつ径が減少
しているため、融着による光ファイバの変形が少なく、
これに起因する損失増加が抑えられるためである。The excess loss of this broadband optical fiber coupler is 0.2d
The loss was low. In this embodiment, by using optical fibers with different propagation constants, the length (
In this example, since the diameter of the optical fiber is the same (8 mm), the shape of the optical fiber at the fused part during fusion is symmetrical, and the diameter is reduced, so there is little deformation of the optical fiber due to fusion.
This is because an increase in loss caused by this can be suppressed.
第５図は、本発明による広帯域光ファイバカップラの光
分岐比の波長依存性を示す図であって、その特性を実線
Ａで示し、比較のため従来の広帯域光ファイバカップラ
の特性を実線Ｂで示している。この第５図から明らかな
ように、本発明による広帯域光ファイバカップラは、上
記したように２本の光ファイバをそれぞれ等しい延伸部
で延伸することによって、光結合度波長依存性の周期性
が従来のものに比較して緩和されていることがわかる。FIG. 5 is a diagram showing the wavelength dependence of the optical branching ratio of the broadband optical fiber coupler according to the present invention, whose characteristics are shown by solid line A, and for comparison, the characteristics of a conventional broadband optical fiber coupler are shown by solid line B. It shows. As is clear from FIG. 5, in the broadband optical fiber coupler according to the present invention, the periodicity of the wavelength dependence of the degree of optical coupling is improved by stretching the two optical fibers with equal stretching parts as described above. It can be seen that this is relaxed compared to the previous one.
以上のように、本実施例では、光ファイバカップラの光
分岐特性の広帯域化を図ることができた。As described above, in this example, the optical branching characteristics of the optical fiber coupler were able to be made broadband.
（発明の効果）
以上説明したように、請求項（１）または請求項（２）
によれば、互いに異なる伝搬定数を有する２本の光ファ
イバにおける、それぞれ等しい延伸部で延伸された延伸
部を互いに融着延伸してなる光結合部を備え、また２本
の光ファイバの異なる伝搬定数を光ファイバのコア径ま
たはコアの屈折率としたので、光分岐比の波長依存性の
周期性を緩和でき、光分岐比の任意性、広帯域性に優れ
、光過剰損失が少なく、信頼性の高い広帯域光ファイバ
カップラを実現できる。(Effect of the invention) As explained above, claim (1) or claim (2)
According to the above, an optical coupling part is provided in which two optical fibers having different propagation constants are drawn by the same stretching part, and are fused and stretched to each other, and the two optical fibers have different propagation constants. Since the constant is the core diameter of the optical fiber or the refractive index of the core, the periodicity of the wavelength dependence of the optical branching ratio can be alleviated, and the optical branching ratio is arbitrary, has excellent broadband properties, has little excess optical loss, and is highly reliable. It is possible to realize a broadband optical fiber coupler with high performance.
また、請求項（３）または請求項（４）によれば、２本
の光ファイバを予め等しい延伸部で延伸を行なうため、
光結合部を従来のものに比べて大幅に長く形成すること
が可能となり、従来よりさらに分岐比を広帯域化させる
ことができ、融若時におけるその融着部の光フアイバ形
状が対称であり、径が減少しているため、融着による光
ファイバの変形を少なくでき、損失増加の原因を抑える
ことができるとともに、容易、かつ安価に広帯域光ファ
イバカップラを製造することができる。Furthermore, according to claim (3) or claim (4), since the two optical fibers are stretched in advance at equal stretching sections,
The optical coupling part can be made much longer than conventional ones, the branching ratio can be made wider than before, and the shape of the optical fiber at the fused part is symmetrical when fused and young. Since the diameter is reduced, deformation of the optical fiber due to fusion can be reduced, the cause of increased loss can be suppressed, and a broadband optical fiber coupler can be easily and inexpensively manufactured.
第１図は本発明の一実施例を示す広帯域光ファイバカッ
プラの斜視図、第２図は従来の広帯域光ファイバカップ
ラの光結合部の構造図、第３図は従来の基本的な光ファ
イバカップラと広帯域光ファイバカップラの光分岐比の
波長依存性を示す図、第４図は本発明に係る広帯域光フ
ァイバカップラにおける光結合部の構造図、第５図は本
発明に係る広帯域光ファイバカップラの光分岐比の波長
依存性を示す図である。
ｕ中、ｌｌａ、ｌｌｂ・・・単一モード光ファイバ、１
１ ａ−１，１ｌ ｂ−１−コア、１ｌａ−２゜１１ｂ
−２・・・クラッド、１２・・・光結合部、１２ａ・・
・ブリ延伸部、１２ｂ・・・融着延伸部、１３・・・石
英ガラス基板、１４・・・固定部、１５・・・金属ケー
ス。
１３：基矛反
１４：固定部
１５：＃属ケー又
特許出願人 日本電信電話株式会社
日本航空電子工業株式会社FIG. 1 is a perspective view of a broadband optical fiber coupler showing an embodiment of the present invention, FIG. 2 is a structural diagram of an optical coupling part of a conventional broadband optical fiber coupler, and FIG. 3 is a diagram of a conventional basic optical fiber coupler. FIG. 4 is a structural diagram of the optical coupling part in the broadband optical fiber coupler according to the present invention, and FIG. 5 is a diagram showing the wavelength dependence of the optical branching ratio of the broadband optical fiber coupler according to the present invention. FIG. 3 is a diagram showing the wavelength dependence of the optical branching ratio. u medium, lla, llb...single mode optical fiber, 1
1 a-1, 1l b-1-core, 1la-2゜11b
-2... Clad, 12... Optical coupling part, 12a...
- Buri extension part, 12b... Fusion extension part, 13... Quartz glass substrate, 14... Fixing part, 15... Metal case. 13: Fundamental Contradiction 14: Fixed Part 15: #Group Key Patent Applicant: Nippon Telegraph and Telephone Corporation Japan Aviation Electronics Industry, Ltd.
Claims (4)
における、それぞれ等しい延伸度で延伸された延伸部を
互いに融着延伸してなる光結合部を備えた ことを特徴とする広帯域光ファイバカップラ。(1) A broadband optical fiber coupler characterized by comprising an optical coupling portion formed by fusion-stretching the stretched portions of two optical fibers having mutually different propagation constants, each stretched to the same degree of stretching.
の屈折率である請求項（１）記載の広帯域光ファイバカ
ップラ。(2) The broadband optical fiber coupler according to claim 1, wherein the propagation constant is a core diameter or a refractive index of the optical fiber.
イバカップラの製造方法において、 互いに異なる伝搬定数を有する２本の光ファイバを等し
い延伸度でそれぞれ延伸した後、 これらの延伸部を互いに融着し、 しかる後さらにこの融着部を延伸する ことを特徴とする光ファイバカップラの製造方法。(3) In a method for manufacturing a broadband optical fiber coupler equipped with an optical coupling part that branches optical signals, two optical fibers having different propagation constants are each stretched to the same degree of stretching, and then these stretched parts are connected to each other. A method for manufacturing an optical fiber coupler, which comprises fusing and then further stretching the fused portion.
の屈折率である請求項（３）記載の広帯域光ファイバカ
ップラの製造方法。(4) The method for manufacturing a broadband optical fiber coupler according to claim 3, wherein the propagation constant is a core diameter or a refractive index of the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32603588A JPH02171705A (en) | 1988-12-26 | 1988-12-26 | Wide band optical fiber coupler and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32603588A JPH02171705A (en) | 1988-12-26 | 1988-12-26 | Wide band optical fiber coupler and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02171705A true JPH02171705A (en) | 1990-07-03 |
Family
ID=18183374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32603588A Pending JPH02171705A (en) | 1988-12-26 | 1988-12-26 | Wide band optical fiber coupler and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02171705A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6591041B2 (en) | 2001-03-02 | 2003-07-08 | Ntt Advanced Technology Corporation | Optical fiber coupler, manufacturing method and apparatus thereof |
| US7169847B2 (en) | 2001-02-27 | 2007-01-30 | Life Therapeutics, Inc. | Polymeric membranes and uses thereof |
-
1988
- 1988-12-26 JP JP32603588A patent/JPH02171705A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7169847B2 (en) | 2001-02-27 | 2007-01-30 | Life Therapeutics, Inc. | Polymeric membranes and uses thereof |
| US6591041B2 (en) | 2001-03-02 | 2003-07-08 | Ntt Advanced Technology Corporation | Optical fiber coupler, manufacturing method and apparatus thereof |
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