JPH0216507A - Polarization maintaining optical fiber coupler and production thereof - Google Patents
Polarization maintaining optical fiber coupler and production thereofInfo
- Publication number
- JPH0216507A JPH0216507A JP63167380A JP16738088A JPH0216507A JP H0216507 A JPH0216507 A JP H0216507A JP 63167380 A JP63167380 A JP 63167380A JP 16738088 A JP16738088 A JP 16738088A JP H0216507 A JPH0216507 A JP H0216507A
- Authority
- JP
- Japan
- Prior art keywords
- polarization
- optical fiber
- maintaining optical
- core
- maintaining
- 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 71
- 230000010287 polarization Effects 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000000835 fiber Substances 0.000 claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 claims abstract description 9
- 230000001902 propagating effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims 1
- 230000006866 deterioration Effects 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 150000003839 salts Chemical class 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
- G02B6/2843—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 the couplers having polarisation maintaining or holding properties
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、１本の光ファイバから複数の光ファイバへ入
射光の直線偏波状態を保持したまま光を分岐する偏波保
持光ファイバカプラおよ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 is a polarization-maintaining optical fiber coupler that branches light from one optical fiber to multiple optical fibers while maintaining the linear polarization state of the incident light. and its manufacturing method.
偏波保持光ファイバカプラとして、従来から２本の偏波
保持光ファイバを相互に融着したものがあった。Conventionally, polarization-maintaining optical fiber couplers have been made by fusing two polarization-maintaining optical fibers together.
第４図は、その製造方法を示す斜視図である。FIG. 4 is a perspective view showing the manufacturing method.
まず、２本の被覆を除去した偏波保持光ファイバ１．２
を用意し、この偏波保持光ファイバ１．２をファイバ保
持部材３．４に設置する。その後、偏波保持光ファイバ
１．２を光軸を中心に回転させ、それぞれの偏波の主軸
方向５．６を図示のように一致させる。ついで、ファイ
バ保持部材３．４の間において偏波保持光ファイバ１．
２をバーナー７で加熱しながらファイバ保持部材３．４
を相互に引き離すことにより、ファイバ指示部材３．４
間の偏波保持光ファイバ１．２を融着延伸させ、偏波保
持光ファイバカプラが作製される。このようにして形成
された偏波保持光ファイバカプラの融着延伸部では、融
着延伸によってコア８．９が適当に近接し、光分岐結合
作用が達成される。なお、符号１０〜１３はそれぞれ応
力付与部を示している。First, two polarization-maintaining optical fibers with their coatings removed 1.2
is prepared, and this polarization-maintaining optical fiber 1.2 is installed in the fiber holding member 3.4. Thereafter, the polarization-maintaining optical fiber 1.2 is rotated about the optical axis so that the principal axis directions 5.6 of the respective polarized waves coincide as shown in the figure. Then, the polarization-maintaining optical fiber 1.4 is held between the fiber holding members 3.4.
2 while heating the fiber holding member 3.4 with the burner 7.
3.4 by pulling apart from each other the fiber directing members 3.4.
A polarization-maintaining optical fiber coupler is produced by fusion-stretching the polarization-maintaining optical fibers 1.2 between them. In the fusion-stretched portion of the polarization-maintaining optical fiber coupler thus formed, the cores 8 and 9 are appropriately brought close to each other by fusion-stretching, and an optical branching and coupling effect is achieved. In addition, codes|symbols 10-13 have shown the stress applying part, respectively.
ところで、光を分岐した後も入射光の直線偏波状態を保
持する能力の高い偏波保持光ファイバカプラを得るため
には、２本の偏波保持光ファイバの偏波の主軸方向を高
精度で一致させることが必須である。By the way, in order to obtain a polarization-maintaining optical fiber coupler that has a high ability to maintain the linearly polarized state of the incident light even after splitting the light, it is necessary to adjust the principal axes of polarization of the two polarization-maintaining optical fibers with high precision. It is essential that they match.
第５図は、上記従来の偏波保持光ファイバカプラの製造
工程において、偏波保持光ファイバの偏波の主軸方向を
一致させるための方法を示す図である。被覆を除去した
偏波保持光ファイバ１．２をガラス板１４．１５で挾み
その間にマツチングオイル１６を含ませて偏波保持光フ
ァイバ１．２をマツチングオイル１６に侵潰させる。そ
の後、光源１７からの光を透過照明として利用し、顕微
鏡１８によって応力付与部１０．１１および１２．１３
の方向を観察しなから偏波保持光ファイバ１．２を光軸
を中心に回転させ、偏波の主軸方向を一致させる。FIG. 5 is a diagram showing a method for aligning the main axes of polarization of polarization-maintaining optical fibers in the manufacturing process of the conventional polarization-maintaining optical fiber coupler. The polarization-maintaining optical fiber 1.2 from which the coating has been removed is sandwiched between glass plates 14.15, and matching oil 16 is impregnated between them, so that the polarization-maintaining optical fiber 1.2 is eroded by the matching oil 16. Thereafter, using the light from the light source 17 as transmitted illumination, the stress applying parts 10.11 and 12.13 are
While observing the direction, the polarization-maintaining optical fiber 1.2 is rotated around the optical axis so that the principal axes of the polarized waves coincide.
このように、従来の偏波保持光ファイバカプラは、顕微
鏡による応力付与部の観察によって偏波の主軸方向を一
致させるという非常に煩わしいマニュアル工程を経て作
製されるものであった。したがって、高精度に主軸が合
致した偏波保持光ファイバカプラを得ることが困難であ
り、そのようなものを得るためには非常に長い作業時間
が必要であった。すなわち、従来の偏波保持光ファイバ
カプラは、その特性および生産性の面で大きな問題があ
った。As described above, conventional polarization-maintaining optical fiber couplers have been manufactured through a very troublesome manual process in which the directions of the principal axes of polarized waves are matched by observing the stress-applying portion using a microscope. Therefore, it is difficult to obtain a polarization-maintaining optical fiber coupler whose principal axes coincide with each other with high precision, and a very long working time is required to obtain such a coupler. That is, conventional polarization-maintaining optical fiber couplers have had major problems in terms of their characteristics and productivity.
本発明の課題は、このような問題点を解消することにあ
る。An object of the present invention is to solve these problems.
上記課題を解決するために、本発明の偏波保持光ファイ
バカプラは、入射光をその直線偏波状態を保持して伝搬
する複数のコアを有し各コアを伝搬する光の偏波の主軸
方向が一致している任意の長さに切り出されたマルチコ
ア偏波保持光ファイバの中間部が延伸されて光分岐結合
部が形成されているものである。また、本発明の偏波保
持光ファイバカプラの製造方法は、入射光をその直線偏
波状態を保持して伝搬する複数のコアを有し各コアを伝
搬する光の偏波の主軸方向が一致しているマルチコア偏
波保持光ファイバを適当に離隔した２個のファイバ保持
部材に設置する工程と、２個のファイバ保持部材の間に
おいてマルチコア偏波保持光ファイバを加熱しながら２
個のファイバ保持部材を離隔させてこのマルチコア偏波
保持光ファイバの被加熱部を延伸する工程とを有するも
のである。In order to solve the above problems, the polarization-maintaining optical fiber coupler of the present invention has a plurality of cores that propagate incident light while maintaining its linear polarization state, and the main axis of polarization of light propagating through each core. An optical branching/coupling portion is formed by stretching the middle portion of a multi-core polarization-maintaining optical fiber cut to an arbitrary length with the same direction. Further, the method for manufacturing a polarization-maintaining optical fiber coupler of the present invention has a plurality of cores that propagate incident light while maintaining its linear polarization state, and the principal axis of polarization of light propagating through each core is aligned. A step of installing a multi-core polarization-maintaining optical fiber on two appropriately spaced fiber holding members, and heating the multi-core polarization-maintaining optical fiber between the two fiber holding members.
and stretching the heated portion of the multi-core polarization-maintaining optical fiber by separating the fiber holding members from each other.
本発明の偏波保持光ファイバの光分岐結合部は、各コア
を伝搬する光の偏波の主軸方向が一致しているマルチコ
ア偏波保持光ファイバがそのまま延伸されたものである
ので、入射光の直線偏波状態が保持されたまま分岐され
る。そのため、分岐後の光の偏波保持特性の劣化が発生
しない。また、本発明の製造方法は、複数のコアの偏波
の主軸方向がファイバの段階で一致しているので、光分
岐結合部の形成段階における偏波の主軸合わせが不要で
ある。The optical branching/coupling section of the polarization-maintaining optical fiber of the present invention is a multi-core polarization-maintaining optical fiber, in which the principal axes of polarization of the light propagating through each core are the same, and is thus extended as is. is branched while maintaining its linear polarization state. Therefore, deterioration of the polarization maintaining characteristics of the light after branching does not occur. Furthermore, in the manufacturing method of the present invention, since the principal axes of the polarized waves of the plurality of cores are the same at the fiber stage, there is no need to align the principal axes of the polarized waves at the stage of forming the optical branching/coupling section.
第１図および第２図は本発明の一実施例である偏波保持
光ファイバカプラの製造方法を示す斜視図である。横断
面が長円形状の光ファイバ２１には２個のコア２２．２
３が設けられている。コア２２．２３のそれぞれの上下
には、応力付与部２４．２５および２６．２７が設けら
れている。1 and 2 are perspective views showing a method of manufacturing a polarization-maintaining optical fiber coupler, which is an embodiment of the present invention. The optical fiber 21 having an oval cross section has two cores 22.2.
3 is provided. Stress applying portions 24.25 and 26.27 are provided above and below each of the cores 22.23.
応力付与部２４〜２７は、ボロン添加の石英材料やアル
ミニウム添加の石英材料でできており、応力付与部２４
．２５からコア２２に対して、また、応力付与部２６．
２７からコア２３に対してそれぞれ応力が働き、この応
力により偏波の主軸方向が決定される。マルチコア偏波
保持光ファイバ２１では、応力付与部２４〜２７の構造
およびコア２２．２３との位置関係が調整されて、２つ
のコア２２．２３に対する応力の方向が高精度に一致し
ており、したがって、コア２２．２３の偏波の主軸方向
が一致している。本実施例では、マルチコア偏波保持光
ファイバ２１の横断面の長平方向の寸法ａが２５０μｍ
１短手方向の寸法すが１２５μｍ、コア２２．２３の距
離Ｃが１２５μｍ１応力付与部２４〜２７の直径ｄが３
０μｍ１応力付与部２４と２５並びに２６と２７の内側
間隔ｅが２０μｍである。The stress applying parts 24 to 27 are made of boron-added quartz material or aluminum-added quartz material.
．． 25 to the core 22, and the stress applying section 26.
27 exert stress on the core 23, and this stress determines the direction of the principal axis of polarization. In the multi-core polarization-maintaining optical fiber 21, the structure of the stress applying parts 24 to 27 and the positional relationship with the core 22.23 are adjusted so that the directions of stress on the two cores 22.23 match with high precision. Therefore, the main axis directions of the polarized waves of the cores 22 and 23 are the same. In this embodiment, the dimension a in the longitudinal direction of the cross section of the multi-core polarization maintaining optical fiber 21 is 250 μm.
1. The dimension in the short direction is 125 μm, the distance C of the core 22.23 is 125 μm, 1 the diameter d of the stress applying parts 24 to 27 is 3.
0 μm1 The inner distance e between the stress applying portions 24 and 25 and 26 and 27 is 20 μm.
このようなマルチコア偏波保持光ファイバ２１は、被覆
が除去されてファイバ保持部材２８．２９に設置される
。Such a multi-core polarization-maintaining optical fiber 21 is installed in a fiber holding member 28, 29 after the coating is removed.
つぎに、第２図に示すように、マルチコア偏波保持光フ
ァイバ２１をファイバ保持部材２８．２９の間において
、バーナー７で加熱しながらファイバ保持部材２８．２
９を互いに引き離すことにより、−マルチコア偏波保持
光ファイバ２１を延伸する。この延伸によって被加熱部
のコア２２および２３、並びに、応力付与部２４．２５
および２６．７が互いに近接し、光分岐結合部が形成さ
れて偏波保持光ファイバカプラとなる。Next, as shown in FIG. 2, the multi-core polarization-maintaining optical fiber 21 is placed between the fiber holding members 28.29 while being heated by the burner 7.
9 apart from each other, - the multi-core polarization maintaining optical fiber 21 is drawn. By this stretching, the cores 22 and 23 of the heated part and the stress applying part 24,25
and 26.7 are brought close to each other, and an optical branching/coupling section is formed to form a polarization-maintaining optical fiber coupler.
つぎに、本実施例の偏波保持光ファイバカブラを実際に
試作した結果を以下に説明する。Next, the results of actually prototyping the polarization-maintaining optical fiber coupler of this example will be described below.
まず、延伸前のマルチコア偏波保持光ファイバ２１の両
端に、それぞれ偏波保持光ファイバ３１〜３４を偏波の
主軸を合わせた上で融着接続し、このマルチコア偏波保
持光ファイバ２１をファイバ保持部材２８．２９に設置
して、片端の１本の偏波保持光ファイバ３１に図示省略
した光源を設け、他端の２本の偏波保持光ファイバ３３
．３４にそれぞれ図示省略した光パワーメータを設けた
。First, the polarization-maintaining optical fibers 31 to 34 are fusion-spliced to both ends of the multi-core polarization-maintaining optical fiber 21 before stretching, respectively, with their main axes of polarization aligned, and the multi-core polarization-maintaining optical fiber 21 is connected to the fiber. A light source (not shown) is provided on one polarization-maintaining optical fiber 31 at one end, and two polarization-maintaining optical fibers 33 at the other end are installed in the holding members 28 and 29.
．． 34 were each provided with an optical power meter (not shown).
そして、光源から偏波保持光ファイバ３１にモニタ光を
入射し、光パワーメータで偏波保持光ファイバ３３．３
４の出力光をモニタしながら、バーナー７でマルチコア
偏波保持光ファイバ２１を加熱し延伸を行った。延伸前
はモニタ光が偏波保持光ファイバ３３のみから出力され
、延伸に伴ってモニタ光が徐々に分岐し、偏波保持光フ
ァイバ３３と３４における出力が等しくなった時点で延
伸を停止した。Then, monitor light is inputted from the light source into the polarization-maintaining optical fiber 31, and the polarization-maintaining optical fiber 33.3 is measured using an optical power meter.
While monitoring the output light of 4, the multi-core polarization maintaining optical fiber 21 was heated and stretched using the burner 7. Before stretching, the monitor light was output only from the polarization-maintaining optical fiber 33, and as the stretching progressed, the monitor light gradually branched, and when the outputs of the polarization-maintaining optical fibers 33 and 34 became equal, the stretching was stopped.
このようにして１０個の偏波保持光ファイバカブラを試
作し、その特性評価を行ったところ、挿入損失は平均０
．１１ｄＢ、偏波保持光ファイバ３１から３４へのクロ
ストークは平均−２９ｄＢ。When we prototyped 10 polarization-maintaining optical fiber couplers in this way and evaluated their characteristics, we found that the average insertion loss was 0.
．． 11 dB, and the average crosstalk from polarization maintaining optical fiber 31 to 34 is -29 dB.
偏波保持光ファイバ３１から３３へのクロストークは平
均−３０ｄＢと良好な特性結果が得られた。The crosstalk from the polarization maintaining optical fibers 31 to 33 was -30 dB on average, and a good characteristic result was obtained.
なお、本実施例に用いたマルチコア偏波保持光ファイバ
は、その横断面が長円形状であるが、これに限定される
ものではなく、例えば、第３図に示すような８の字形状
のものでも良い。Although the multi-core polarization-maintaining optical fiber used in this example has an oval cross section, the cross section is not limited to this. For example, it may have a figure-eight shape as shown in FIG. Anything is fine.
また、本実施例のコアの数は２個であるが、３個以上で
も良い。Further, although the number of cores in this embodiment is two, it may be three or more.
以上説明したように、本発明の偏波保持光ファイバカプ
ラによれば、各コアを伝搬する光の偏波の主軸方向が一
致しているマルチコア偏波保持光ファイバをそのまま延
伸して形成された光分岐結合部を有するものであるので
、分岐後の光の偏波保持特性が極めて良好である。また
、本発明の製造方法は、複数のコアの偏波の主軸方向が
予め一致しているファイバを用いるので、偏波の主軸合
わせが不要であり、作業時間の短縮化を図ることができ
、生産性の向上に極めて有効である。As explained above, according to the polarization-maintaining optical fiber coupler of the present invention, the polarization-maintaining optical fiber coupler is formed by directly stretching a multi-core polarization-maintaining optical fiber in which the main axis direction of the polarization of light propagating through each core is the same. Since it has an optical branching/coupling section, the polarization maintaining characteristic of the light after branching is extremely good. Furthermore, since the manufacturing method of the present invention uses a fiber in which the principal axes of polarized waves of a plurality of cores are aligned in advance, there is no need to align the principal axes of polarized waves, and the working time can be shortened. It is extremely effective in improving productivity.
第１図は、本発明の偏波保持光ファイバカプラ製造方法
の一実施例の前半工程を示す斜視図、第２図は、その後
半工程を示す斜視図、第３図は、他の実施例である偏波
保持光ファイバカプラの断面図、第４図は、従来の偏波
保持光ファイバカプラ製造方法を示す斜視図、第５図は
、従来方法における偏波の主軸合わせ方法を示す図であ
る。
７・・・バーナー ２１．２１′・・・偏波保持光ファ
イバ、２２．２３・・・コア、２４〜２７・・・応力付
与部、２８．２９・・・ファイバ保持手段。
特許出願人 住友電気工業株式会社
代理人弁理士 長谷用 芳 樹間
塩 １） 辰 也実流側の製造工程前
半
第１図FIG. 1 is a perspective view showing the first half process of one embodiment of the polarization maintaining optical fiber coupler manufacturing method of the present invention, FIG. 2 is a perspective view showing the second half process, and FIG. 3 is a perspective view showing another embodiment. FIG. 4 is a perspective view showing a conventional polarization maintaining optical fiber coupler manufacturing method, and FIG. 5 is a diagram showing a method for aligning the principal axis of polarization in the conventional method. be. 7... Burner 21.21'... Polarization maintaining optical fiber, 22.23... Core, 24-27... Stress applying section, 28.29... Fiber holding means. Patent applicant: Sumitomo Electric Industries, Ltd. Representative patent attorney Yoshiki Hase
Salt 1) Figure 1 of the first half of the manufacturing process on the Tatsuyami side
Claims (1)
のコアを有し各コアを伝搬する光の偏波の主軸方向が一
致している任意の長さに切り出されたマルチコア偏波保
持光ファイバの中間部が延伸されて光分岐結合部が形成
されている偏波保持光ファイバカプラ。 ２、両端面におけるコア相互の間隔がこの両端面に接続
される偏波保持光ファイバのクラッド径以上である請求
項１記載の偏波保持光ファイバカプラ。 ３、入射光をその直線偏波状態を保持して伝搬する複数
のコアを有し各コアを伝搬する光の偏波の主軸方向が一
致しているマルチコア偏波保持光ファイバを適当に離隔
した２個のファイバ保持部材に設置する工程と、２個の
ファイバ保持部材の間においてマルチコア偏波保持光フ
ァイバを加熱しながら２個のファイバ保持部材を離隔さ
せてこのマルチコア偏波保持光ファイバの被加熱部を延
伸する工程とを有する偏波保持光ファイバカプラの製造
方法。[Claims] 1. A plurality of cores that propagate incident light while maintaining its linearly polarized state, and the direction of the principal axis of polarization of the light propagating through each core is the same as that of an arbitrary length. A polarization-maintaining optical fiber coupler in which an optical branching/coupling section is formed by stretching the middle portion of a cut out multi-core polarization-maintaining optical fiber. 2. The polarization-maintaining optical fiber coupler according to claim 1, wherein the distance between the cores on both end faces is equal to or larger than the cladding diameter of the polarization-maintaining optical fiber connected to the end faces. 3. A multi-core polarization-maintaining optical fiber, which has multiple cores that propagate incident light while maintaining its linearly polarized state, and in which the principal axes of polarization of the light propagating through each core are aligned, is appropriately spaced apart. A step of installing the multi-core polarization-maintaining optical fiber on two fiber holding members, and separating the two fiber holding members while heating the multi-core polarization-maintaining optical fiber between the two fiber holding members to cover the multi-core polarization-maintaining optical fiber. A method for manufacturing a polarization-maintaining optical fiber coupler, comprising the step of stretching a heating section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63167380A JPH0216507A (en) | 1988-07-05 | 1988-07-05 | Polarization maintaining optical fiber coupler and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63167380A JPH0216507A (en) | 1988-07-05 | 1988-07-05 | Polarization maintaining optical fiber coupler and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0216507A true JPH0216507A (en) | 1990-01-19 |
Family
ID=15848642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63167380A Pending JPH0216507A (en) | 1988-07-05 | 1988-07-05 | Polarization maintaining optical fiber coupler and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0216507A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59198419A (en) * | 1983-04-26 | 1984-11-10 | Nippon Telegr & Teleph Corp <Ntt> | Production of fiber-shaped directional coupler |
-
1988
- 1988-07-05 JP JP63167380A patent/JPH0216507A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59198419A (en) * | 1983-04-26 | 1984-11-10 | Nippon Telegr & Teleph Corp <Ntt> | Production of fiber-shaped directional coupler |
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