JP2749842B2 - Multiplexer / demultiplexer - Google Patents
Multiplexer / demultiplexerInfo
- Publication number
- JP2749842B2 JP2749842B2 JP63288139A JP28813988A JP2749842B2 JP 2749842 B2 JP2749842 B2 JP 2749842B2 JP 63288139 A JP63288139 A JP 63288139A JP 28813988 A JP28813988 A JP 28813988A JP 2749842 B2 JP2749842 B2 JP 2749842B2
- Authority
- JP
- Japan
- Prior art keywords
- demultiplexer
- multiplexer
- fusion
- fibers
- coupling
- 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 - Lifetime
Links
Landscapes
- Mechanical Coupling Of Light Guides (AREA)
- Optical Integrated Circuits (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、２つ以上の光波を一本のファイバに入射さ
せたり、一本のファイバを伝送してきた２つ以上の光波
を分離する合波分波器に関する。DETAILED DESCRIPTION OF THE INVENTION "Industrial application field" The present invention relates to a method for making two or more light waves incident on one fiber or separating two or more light waves transmitted through one fiber. It relates to a wave splitter.
「従来の技術」 合波分波器の一種に、光ファイバからなる融着延伸型
のものがある。この融着延伸型の合波分波器は、第１図
に示すように、光ファイバ1,1が融着結合部２の部分で
一体化されたものである。"Prior art" One type of multiplexer / demultiplexer is a fusion-stretched type made of an optical fiber. As shown in FIG. 1, the fusion-stretching type multiplexing / demultiplexing device has optical fibers 1 and 1 integrated at a fusion bonding portion 2.
この合波分波器を製造するには、まず中央部分の被覆
材が除去された２本の光ファイバ1,1を平行に並べて移
動台に固定する。ついで２本のファイバ1,1を側面から
約1500〜1700度で加熱して、２本のファイバを融着す
る。この融着時のヒートゾーンは３〜4mmである。この
後、加熱を続けながら移動台を動かしてファイバ1,1の
融着部分を延伸する。この延伸により、ファイバ外径と
共にコア径が小さくなり、光の電磁界分布の広がりが増
し２本のファイバのコア間で光の結合が生じる状態とな
る。In order to manufacture this multiplexer / demultiplexer, first, two optical fibers 1, 1 from which the coating material at the central portion has been removed are arranged in parallel and fixed to a movable table. Next, the two fibers 1,1 are heated from about 1500 to 1700 degrees from the side to fuse the two fibers. The heat zone at the time of this fusion is 3 to 4 mm. Thereafter, the moving table is moved while continuing the heating, and the fused portion of the fibers 1 and 1 is drawn. By this stretching, the core diameter becomes smaller together with the outer diameter of the fiber, the spread of the electromagnetic field distribution of light increases, and light coupling occurs between the cores of the two fibers.
従来の合波分波器は、通常のシングルモードファイバ
が融着結合されたもので、光結合が生じるためには最低
10mmの結合長が必要であった。Conventional multiplexing / demultiplexing devices are those in which ordinary single mode fibers are fusion-bonded.
A bond length of 10 mm was required.
「発明が解決しようとする課題」 このような従来の合波分波器は、結合長が長いため製
造時の延伸量が大きく、融着結合部２が極めて細い（約
30μｍ以下）ものとなる。この結果従来の合波分波器で
は、融着結合部２がわずかに湾曲されただけで光が外部
に多量に放出され、曲がり損失が大きい不満があった。"Problems to be Solved by the Invention" Such a conventional multiplexer / demultiplexer has a large coupling length, a large amount of stretching at the time of manufacturing, and an extremely thin fusion bonding portion 2 (about
30 μm or less). As a result, in the conventional multiplexer / demultiplexer, a large amount of light is emitted to the outside even if the fusion joint 2 is slightly curved, and there is a dissatisfaction that the bending loss is large.
また結合長が長いので、アイソレーションが220dB程
度と低い不満が有った。Also, since the coupling length was long, there was a complaint that the isolation was as low as about 220 dB.
「発明の目的」 本発明は前記事情に鑑みてなされたもので、曲がり損
失が小さく、アイソレーションが高い合波分波器を提供
することを目的とする。"Object of the Invention" The present invention has been made in view of the above circumstances, and has as its object to provide a multiplexer / demultiplexer having a small bending loss and a high isolation.
「課題を解決するための手段」 本発明の合波分波器は、分散シフトファイバ同士が結
合されてなり、その結合長が７〜8mmに設定されたもの
である。[Means for Solving the Problems] The multiplexer / demultiplexer of the present invention is configured such that dispersion-shifted fibers are coupled to each other, and the coupling length is set to 7 to 8 mm.
この合波分波器を構成する分散シフトファイバは、波
長1.4〜1.6μｍ付近で導波路分散と材料分散とが相殺さ
れて波長分散が零となるように、比屈折率差等のファイ
バパラメータが設定されたものである。Fiber parameters such as a relative refractive index difference of the dispersion-shifted fiber constituting the multiplexer / demultiplexer are set such that the waveguide dispersion and the material dispersion are offset at wavelengths around 1.4 to 1.6 μm and the chromatic dispersion becomes zero. It is set.
この合波分波器の結合長が7mm以下であると、十分な
光結合が生じない。また結合長が8mmを越えると、必要
以上にファイバが延伸されることとなり、結合部分の曲
げ損失が不必要に増大してしまう。If the coupling length of the multiplexer / demultiplexer is 7 mm or less, sufficient optical coupling does not occur. If the coupling length exceeds 8 mm, the fiber will be stretched more than necessary, and the bending loss at the coupling portion will increase unnecessarily.
この合波分波器を製造するには、まず中央部分の被覆
材が除去された２本の分散シフトファイバを平行に並べ
て移動台に固定する。ついで２本のファイバを側面から
加熱して、２本のファイバを融着する。この時のヒート
ゾーンの幅は約３〜4mmに設定され、温度は1500〜1700
度程度に設定される。融着部分を顕微鏡で観察して、融
着度（融着部の短径／長径）が0.7以上になったところ
で融着工程を完了する。In order to manufacture this multiplexer / demultiplexer, first, two dispersion-shifted fibers from which the coating material in the central part has been removed are arranged in parallel and fixed to a movable table. Next, the two fibers are heated from the side to fuse the two fibers. At this time, the width of the heat zone is set to about 3-4 mm, and the temperature is 1500-1700.
Set to about degrees. The fused portion is observed with a microscope, and when the degree of fusion (short diameter / long diameter of the fused portion) becomes 0.7 or more, the fusion step is completed.
次に、加熱を続けながら移動台を動かして結合長が７
〜8mm範囲に入るように延伸する。この延伸工程では、
入射ポートに波長の異なる光波を入射させ、出射ポート
で結合度をモニタする。そして、一方の光波で結合度が
最大となり、他方の光波で結合度が最小となった時点で
延伸を完了する。Next, while the heating is continued, the moving table is moved so that the bond length becomes 7 mm.
It is stretched so as to fall within the range of 88 mm. In this stretching step,
Light waves having different wavelengths are made incident on the input port, and the degree of coupling is monitored at the output port. Then, the stretching is completed when the coupling degree becomes maximum in one light wave and becomes minimum in the other light wave.
この後パッケージを施して合波分波器を完成する。 Thereafter, the package is applied to complete the multiplexer / demultiplexer.
「作用」 本発明の合波分波器は、分散シフトファイバが同士が
結合された結合長７〜8mmのものなので、延伸量が小で
あるにもかかわらず、従来のシングルモードファイバ製
合波分波器に比較してそん色ない合波・分波特性を有す
るものとなる。そのうえ結合長が短いので、製造時の延
伸量が少なく、融着結合部の細りを最小限に抑制するこ
とができる。すなわち融着結合部を太く形成できる。[Operation] The multiplexer / demultiplexer of the present invention has a coupling length of 7 to 8 mm in which dispersion-shifted fibers are coupled to each other. Compared with the duplexer, the multiplexing / demultiplexing characteristics are not so bright. In addition, since the bond length is short, the amount of stretching at the time of manufacturing is small, and the thinning of the fusion bonded portion can be suppressed to a minimum. That is, the fusion bonding portion can be formed thick.
また結合長が短いのでアイソレーションも28〜30dB程
度と高くなる。In addition, since the coupling length is short, the isolation is as high as about 28 to 30 dB.
「実施例」 以下、図面を参照して本発明の合波分波器を詳しく説
明する。Embodiment Hereinafter, a multiplexer / demultiplexer according to the present invention will be described in detail with reference to the drawings.
この合波分波器では光ファイバ1,1として、1.55μｍ
帯で分散波長が零となるように設計された分散シフトフ
ァイバが用いられている。用いられた分散シフトファイ
バは、紫外線硬化型樹脂で被覆されたもので、被覆外径
が250μｍ、クラッド径が125μｍ、モードフィルド径が
８μｍのものであった。In this multiplexer / demultiplexer, 1.55 μm
A dispersion-shifted fiber designed to have a dispersion wavelength of zero in a band is used. The dispersion-shifted fiber used was coated with an ultraviolet curable resin, and had a coating outer diameter of 250 μm, a cladding diameter of 125 μm, and a mode-filled diameter of 8 μm.
この合波分波器の結合長は、約7.5mmであった。また
融着結合部11の最小径は約34μｍであった。The coupling length of this multiplexer / demultiplexer was about 7.5 mm. The minimum diameter of the fusion bonding portion 11 was about 34 μm.
この合波分波器を製造するには、まず分散シフトファ
イバの中央部分の被覆材を除去して平行に並べ、移動台
に固定した。ついで２本のファイバを側面から酸素水素
バーナで約1600度に加熱して融着した。ヒートゾーンの
幅は、約4mmであった。融着部分を顕微鏡で観察して、
融着度が0.75となったところで、加熱を続行しながら移
動台を動かして延伸を開始した。この時、入射ポートに
波長1.31μｍの光波と波長1.54μｍの光波を入射させ、
出射ポートで結合度をモニタした。そして、一方の光波
で結合度が最大となり、他方の光波で結合度が最小とな
ったところで延伸を完了した。To manufacture this multiplexer / demultiplexer, first, the coating material at the center of the dispersion-shifted fiber was removed, the fibers were arranged in parallel, and fixed to a movable table. Then, the two fibers were fused from the side by heating to about 1600 degrees with an oxygen hydrogen burner. The width of the heat zone was about 4 mm. Observe the fused part with a microscope,
When the fusion degree reached 0.75, the moving table was moved while continuing the heating to start stretching. At this time, a light wave with a wavelength of 1.31 μm and a light wave with a wavelength of 1.54 μm are made incident on the incident port,
The degree of coupling was monitored at the exit port. Then, the stretching was completed when the degree of coupling was maximized in one lightwave and the degree of coupling was minimum in the other lightwave.
この合波分波器の融着結合部２を湾曲させて伝送損失
の変化を調べた（測定波長1.55μｍ）。結果を第１表に
示す。The change in the transmission loss was examined by bending the fusion joint 2 of this multiplexer / demultiplexer (measurement wavelength: 1.55 μm). The results are shown in Table 1.
比較の為に、シングルモードファイバ（クラッド径12
5μｍ、モードフィルド径12μｍ）からなる結合長11mm
の合波分波器について、同様の試験をおこなった。結果
を第１表に合わせて示す。For comparison, a single mode fiber (cladding diameter 12
11mm coupling length consisting of 5μm, mode-filled diameter 12μm)
A similar test was conducted for the multiplexer / demultiplexer of No. 1. The results are shown in Table 1.
上表の結果から、実施例の合波分波器は曲げ損失の小
さいものであることが判明した。 From the results in the above table, it was found that the multiplexer / demultiplexer of the example had a small bending loss.
「発明の効果」 以上説明したように本発明の合波分波器は、分散シフ
トファイバ同士が溶融結合され、その結合長が７〜8mm
に設定されたものなので、従来のシングルモードファイ
バからなる合波分波器と比較してそん色のない合波・分
波特性を有するうえに、融着結合部の細りを最小限に抑
制することができる。従って本発明の合波分波器は、融
着結合部が太く曲がり損失が小さいものとなる。[Effects of the Invention] As described above, the multiplexing / demultiplexing device of the present invention is such that dispersion-shifted fibers are fusion-coupled to each other, and the coupling length is 7 to 8 mm.
As compared with the conventional single-mode fiber multiplexer / demultiplexer, it has multiplexing / demultiplexing characteristics without color matching and minimizes the thinning of the fusion joint. can do. Therefore, in the multiplexing / demultiplexing device of the present invention, the fusion-bonded portion is thick and the bending loss is small.
また本発明の合波分波器は結合長が短いので、アイソ
レーションも改善される。Also, the multiplexing / demultiplexing device of the present invention has a short coupling length, so that the isolation is also improved.
第１図は融着結合型の合波分波器の１例を示す正面図で
ある。 １…光ファイバ、２…融着結合部FIG. 1 is a front view showing an example of a fusion-coupled type multiplexer / demultiplexer. 1: optical fiber, 2: fusion spliced part
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−175812（ＪＰ，Ａ) 特開 昭62−69210（ＪＰ，Ａ) 特開 昭62−291605（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-175812 (JP, A) JP-A-62-69210 (JP, A) JP-A-62-291605 (JP, A)
Claims (1)
なり、その結合長が７〜8mmであることを特徴とする合
波分波器。1. A multiplexer / demultiplexer, wherein dispersion-shifted fibers are fusion-coupled to each other, and the coupling length is 7 to 8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63288139A JP2749842B2 (en) | 1988-11-15 | 1988-11-15 | Multiplexer / demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63288139A JP2749842B2 (en) | 1988-11-15 | 1988-11-15 | Multiplexer / demultiplexer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02134604A JPH02134604A (en) | 1990-05-23 |
| JP2749842B2 true JP2749842B2 (en) | 1998-05-13 |
Family
ID=17726317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63288139A Expired - Lifetime JP2749842B2 (en) | 1988-11-15 | 1988-11-15 | Multiplexer / demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2749842B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02137808A (en) * | 1988-11-18 | 1990-05-28 | Sumitomo Electric Ind Ltd | Fiber type coupler |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4733940A (en) * | 1985-09-20 | 1988-03-29 | American Telephone And Telegraph Company, At&T Bell Laboratories | Long wavelength optical fiber communication and sensing systems |
| JPS63175812A (en) * | 1987-01-17 | 1988-07-20 | Nippon Telegr & Teleph Corp <Ntt> | Production of optical fiber coupler |
-
1988
- 1988-11-15 JP JP63288139A patent/JP2749842B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02134604A (en) | 1990-05-23 |
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