JP2003313041A - Method for manufacturing photonic crystal optical fiber preform and photonic crystal optical fiber preform - Google Patents
Method for manufacturing photonic crystal optical fiber preform and photonic crystal optical fiber preformInfo
- Publication number
- JP2003313041A JP2003313041A JP2002114988A JP2002114988A JP2003313041A JP 2003313041 A JP2003313041 A JP 2003313041A JP 2002114988 A JP2002114988 A JP 2002114988A JP 2002114988 A JP2002114988 A JP 2002114988A JP 2003313041 A JP2003313041 A JP 2003313041A
- Authority
- JP
- Japan
- Prior art keywords
- photonic crystal
- optical fiber
- crystal optical
- fiber preform
- sio
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/10—Internal structure or shape details
- C03B2203/14—Non-solid, i.e. hollow products, e.g. hollow clad or with core-clad interface
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/42—Photonic crystal fibres, e.g. fibres using the photonic bandgap PBG effect, microstructured or holey optical fibres
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【発明の属する技術分野】本発明は、大陸間長距離伝送
などに用いられるフォトニッククリスタル光ファイバ母
材の製造方法及びフォトニッククリスタル光ファイバ母
材に係り、特に、母材長が長いフォトニッククリスタル
光ファイバ母材の製造方法及びフォトニッククリスタル
光ファイバ母材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a photonic crystal optical fiber preform used for long-distance transmission between continents and the like, and a photonic crystal optical fiber preform, and more particularly to a photonic crystal having a long preform. The present invention relates to a method for manufacturing a crystal optical fiber preform and a photonic crystal optical fiber preform.
【０００２】[0002]
【従来の技術】従来の光ファイバは、屈折率の高いコア
と、コアよりも僅かに屈折率が低いクラッドとの２層構
造であり、そのベース素材として石英を用いている。コ
アは、クラッドよりも僅かに屈折率を高くするために、
石英にゲルマニウム等の添加物を加えた組成となってい
る。2. Description of the Related Art A conventional optical fiber has a two-layer structure including a core having a high refractive index and a clad having a refractive index slightly lower than that of the core, and quartz is used as a base material thereof. The core has a slightly higher refractive index than the cladding,
It has a composition in which an additive such as germanium is added to quartz.
【０００３】従来の光ファイバにおいては、光ファイバ
のコアの屈折率がクラッドの屈折率よりも高いため、こ
の屈折率差によって、光ファイバに入射した光がコア内
に閉じこめられて光ファイバ中を伝搬することができ
る。伝搬する光の単一モード条件を満足するために、コ
アの直径は５〜１０μｍ程度に形成される。In the conventional optical fiber, since the refractive index of the core of the optical fiber is higher than the refractive index of the clad, the difference in the refractive index causes the light incident on the optical fiber to be confined within the core and to be guided through the optical fiber. Can be propagated. In order to satisfy the single mode condition of the propagating light, the core has a diameter of about 5 to 10 μm.
【０００４】ところが、近年の光増幅技術や波長多重
（ＷＤＭ）技術の発展により、光ファイバへ入射させる
光のパワーが大きくなってきており、その結果、種々の
非線形効果現象が生じ易くなっている。例えば、非線形
効果現象の一つである自己位相変調現象が生じると、光
ファイバ中のパルス信号波形が歪み、伝送容量が制限さ
れる。また、同じく非線形効果現象の一つであるブリュ
リアン散乱現象も生じ易くなっており、この現象が生じ
ると光ファイバに対する光入射パワーが飽和する。つま
り、これらの非線形効果現象が生じると、光ファイバ中
を伝搬する光信号の伝送特性の劣化を招くことになる。However, due to the recent development of optical amplification technology and wavelength division multiplexing (WDM) technology, the power of light incident on an optical fiber has increased, and as a result, various non-linear effect phenomena are likely to occur. . For example, when the self-phase modulation phenomenon, which is one of the nonlinear effect phenomena, occurs, the pulse signal waveform in the optical fiber is distorted and the transmission capacity is limited. In addition, the Brüllian scattering phenomenon, which is one of the nonlinear effect phenomena, is also likely to occur, and when this phenomenon occurs, the light incident power on the optical fiber is saturated. That is, when these non-linear effect phenomena occur, the transmission characteristics of the optical signal propagating in the optical fiber are deteriorated.
【０００５】また、現状の光ファイバの伝送損失は、伝
送損失が最も小さいもので０．１６ｄＢ／ｋｍ程度であ
るが、大陸間長距離伝送等で用いる光ファイバにおいて
は、より一層の低損失化が望まれている。伝送損失の主
要因としては、光が伝搬するコアやコア近傍のクラッド
部の組成密度揺らぎによるレイリー散乱損失が挙げられ
る。The transmission loss of the current optical fiber is about 0.16 dB / km, which is the smallest transmission loss. However, in the optical fiber used for long distance transmission between continents, the loss is further reduced. Is desired. The main cause of transmission loss is Rayleigh scattering loss due to composition density fluctuations of the core where light propagates and the clad portion near the core.
【０００６】そこで、近年、低伝送損失の光ファイバと
して、フォトニッククリスタル光ファイバ（Photonic C
rystal Fiber（以下、ＰＣＦと示す））が注目を集めて
いる。このＰＣＦとは、クラッド部にフォトニック結晶
構造を有する光ファイバである。フォトニック結晶構造
とは、屈折率の周期構造のことであり、具体的には蜂の
巣のようなハニカム構造の空間をクラッド部に設けるこ
とで、光のエネルギー禁制帯であるフォトニックバンド
ギャップ（Photonic Band Gap（以下、ＰＢＧと示
す））が発生する。ＰＢＧ構造を導波原理とするＰＣＦ
として、例えば、ＫｎｉｇｈｔらのＰＣＦがある（Knig
ht etc.，Science282，1476，(1998)参照）。Therefore, in recent years, a photonic crystal optical fiber (Photonic C
The rystal fiber (hereinafter referred to as PCF)) is attracting attention. This PCF is an optical fiber having a photonic crystal structure in the cladding. The photonic crystal structure is a periodic structure with a refractive index. Specifically, by providing a honeycomb structure space like a honeycomb in the clad portion, a photonic band gap (Photonic band gap), which is an energy forbidden band of light, is formed. Band Gap (hereinafter referred to as PBG)) occurs. PCF with PBG structure as guiding principle
For example, there is PCF of Knight et al. (Knig
ht etc., Science 282, 1476, (1998)).
【０００７】ところが、このＰＣＦにおいて光を伝搬さ
せるには、精度良くＰＢＧ構造を形成する必要があるた
め、僅かながらでも構造的な揺らぎがあると、光の伝播
条件を維持できなくなってしまい、いわゆる構造不正損
失が生じてしまう。However, in order to propagate light in this PCF, it is necessary to form a PBG structure with high accuracy. Therefore, if there is a slight structural fluctuation, it becomes impossible to maintain the light propagation condition, and so-called. Structural improper loss will occur.
【０００８】そこで、完全なＰＢＧ構造を有したＰＣＦ
ではないものの、構造不正損失を防ぐために、ガラス組
成の違いにより比屈折率差を持たせた従来の光ファイバ
において、クラッドにおけるコア近傍に長軸方向の貫通
孔を形成してクラッドの実効的な屈折率を下げ、コア／
クラッド間の比屈折率差を大きくすることで、従来の光
ファイバでは得られなかった特性を得ている。例えば、
通常のシングルモードファイバの構造を有する光ファイ
バの、コアの周りのクラッド部に、長手方向全長に亘っ
て４つの空孔を形成してなる空孔付加型ホーリーファイ
バ（Holey Fiber）では、コア／クラッド間の実効的な
比屈折率差を拡大することで、０．８μｍ帯にゼロ分散
とシングルモード動作が得られる（長谷川 etc.，OFC20
01PD5-1参照）。Therefore, a PCF having a complete PBG structure
However, in order to prevent structural improper loss, in a conventional optical fiber that has a relative refractive index difference due to the difference in glass composition, a long through-hole in the long axis direction is formed near the core in the clad to form an effective clad. Lowering the refractive index, core /
By increasing the relative refractive index difference between the clads, the characteristics not obtained by the conventional optical fiber are obtained. For example,
In the hole-added type Holley fiber (Holey Fiber) in which four holes are formed over the entire length in the longitudinal direction in the clad portion around the core of an optical fiber having a normal single mode fiber structure, By expanding the effective relative refractive index difference between the claddings, zero dispersion and single mode operation can be obtained in the 0.8 μm band (Hasegawa etc., OFC20
(See 01PD5-1).
【０００９】[0009]
【発明が解決しようとする課題 】このようなＰＣＦ
は、ＶＡＤ法などで作製した石英ガラス母材の中央部近
傍に長軸方向の貫通孔を形成したものをＰＣＦ母材とし
て用いることで得られる。[Problems to be Solved by the Invention] Such a PCF
Can be obtained by using, as the PCF base material, a quartz glass base material formed by the VAD method or the like and having a through-hole in the long axis direction formed in the vicinity of the central portion thereof.
【００１０】ところで、φ５μｍの貫通孔を有するφ１
２５μｍのＰＣＦを得るためのＰＣＦ母材は、ＰＣＦ母
材の外径が５０ｍｍの場合、貫通孔の径が２ｍｍとな
る。このφ２ｍｍの貫通孔をドリルを用いて形成する場
合、ドリル長があまり長くなるとドリルにたわみが生じ
るため、貫通孔に要求される加工精度を満足できなくな
る。よって、加工精度を満足できるドリル長は、最大で
も２００ｍｍ未満となってしまう。このため、ＰＣＦ母
材の両端面から、中心軸を合わせて貫通孔を形成したと
しても、貫通孔の長さは最大でも４００ｍｍ未満であ
る。ここで、ＰＣＦ母材の外径が２００ｍｍの場合、貫
通孔の径は８ｍｍとなるが、φ８ｍｍの貫通孔を形成可
能なドリルの最大長は、φ２ｍｍの貫通孔を形成可能な
ドリルの最大長よりもやや長くなるものの、ドリルのた
わみは本質的に避けれらないことから、それ程大きな差
異はない。By the way, φ1 having a through hole of φ5 μm
The PCF base material for obtaining a 25 μm PCF has a through hole diameter of 2 mm when the outer diameter of the PCF base material is 50 mm. In the case of forming this φ2 mm through hole using a drill, if the drill length becomes too long, the drill will bend, and the processing accuracy required for the through hole cannot be satisfied. Therefore, the drill length that can satisfy the processing accuracy is less than 200 mm at the maximum. Therefore, even if the through holes are formed by aligning the central axes from both end faces of the PCF base material, the maximum length of the through holes is less than 400 mm. Here, when the outer diameter of the PCF base material is 200 mm, the diameter of the through hole is 8 mm, but the maximum length of a drill that can form a through hole of φ8 mm is the maximum length of a drill that can form a through hole of φ2 mm. Although slightly longer than this, the deflection of the drill is essentially unavoidable, so there is not much difference.
【００１１】つまり、ＰＣＦ母材の最大長は、貫通孔形
成のために用いるドリルの長さによって制約を受けるた
め、全長が４００ｍｍを超えるような長尺のＰＣＦ母材
を製造することは困難であった。That is, since the maximum length of the PCF base material is restricted by the length of the drill used for forming the through hole, it is difficult to manufacture a long PCF base material whose total length exceeds 400 mm. there were.
【００１２】以上の事情を考慮して創案された本発明の
目的は、長尺で、かつ、ＰＢＧ構造の精度が高いフォト
ニッククリスタル光ファイバ母材の製造方法及びフォト
ニッククリスタル光ファイバ母材を提供することにあ
る。The object of the present invention, which was devised in view of the above circumstances, is to provide a method for manufacturing a photonic crystal optical fiber preform having a long length and a high PBG structure accuracy, and a photonic crystal optical fiber preform. To provide.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成すべく本
発明に係るフォトニッククリスタル光ファイバ母材の製
造方法は、ＳｉＯ2で構成されるコアの周りにクラッド
部を有し、かつ、クラッド部のコア近傍にフォトニック
結晶構造を有するフォトニッククリスタル光ファイバ母
材の製造方法において、ＳｉＯ2で構成される円板部材
の中央部近傍に少なくとも１つの貫通孔を形成し、その
円板部材を複数枚積層して積層体を形成すると共に、各
円板部材の貫通孔を連通させ、その積層体に焼結処理を
施して各円板部材を一体に形成するもの、また、ＳｉＯ
2で構成される円板部材の中央部近傍に少なくとも１つ
の貫通孔を形成し、その貫通孔に円板部材と同じ材料で
構成したガイド管を嵌合挿通し、そのガイド管に貫通孔
の位置を合わせて円板部材を複数枚積層して積層体を形
成し、その積層体に焼結処理を施して各円板部材及びガ
イド管を一体に形成するものである。In order to achieve the above object, a method of manufacturing a photonic crystal optical fiber preform according to the present invention has a clad part around a core made of SiO 2 and a clad part. In a method for manufacturing a photonic crystal optical fiber preform having a photonic crystal structure in the vicinity of a core of a disk portion, at least one through hole is formed in the vicinity of the center of a disk member made of SiO 2 , and the disk member is formed. A plurality of layers are laminated to form a laminated body, the through holes of the respective disc members are made to communicate with each other, and the laminated body is subjected to a sintering treatment to integrally form the respective disc members.
At least one through hole is formed in the vicinity of the central portion of the disc member constituted by 2, and a guide tube made of the same material as the disc member is fitted and inserted into the through hole. A plurality of disc members are laminated at the same position to form a laminated body, and the laminated body is subjected to a sintering treatment to integrally form each disc member and the guide tube.
【００１４】以上の製造方法によれば、長尺で、かつ、
ＰＢＧ構造の精度が高いフォトニッククリスタル光ファ
イバ母材を容易に得ることができる。According to the above manufacturing method, the length is long and
It is possible to easily obtain a photonic crystal optical fiber preform having a high precision PBG structure.
【００１５】一方、本発明に係るフォトニッククリスタ
ル光ファイバ母材は、ＳｉＯ2で構成されるコアの周り
にクラッド部を有し、かつ、クラッド部のコア近傍にフ
ォトニック結晶構造を有するフォトニッククリスタル光
ファイバ母材において、ＳｉＯ2で構成される円板部材
の中央部近傍に少なくとも１つの貫通孔を形成し、その
円板部材を複数枚積層して積層体を形成すると共に、各
円板部材の貫通孔を連通させ、その積層体に焼結処理を
施して各円板部材を一体化してなるもの、また、ＳｉＯ
2で構成される円板部材の中央部近傍に少なくとも１つ
の貫通孔を形成し、その貫通孔に円板部材と同じ材料で
構成したガイド管を嵌合挿通し、そのガイド管に貫通孔
の位置を合わせて円板部材を複数枚積層して積層体を形
成し、その積層体に焼結処理を施して各円板部材及びガ
イド管を一体に形成してなるものである。On the other hand, the photonic crystal optical fiber preform according to the present invention has a photonic crystal structure having a cladding portion around a core made of SiO 2 and having a photonic crystal structure near the core of the cladding portion. In the crystal optical fiber preform, at least one through hole is formed in the vicinity of the central portion of a disk member made of SiO 2 , and a plurality of the disk members are laminated to form a laminated body, and each disk is formed. One in which the through-holes of the members are communicated with each other, and the laminated body is subjected to a sintering treatment to integrate the respective disk members, and SiO.
At least one through hole is formed in the vicinity of the central portion of the disc member constituted by 2, and a guide tube made of the same material as the disc member is fitted and inserted into the through hole. A plurality of disc members are laminated at the same position to form a laminated body, and the laminated body is sintered to integrally form each disc member and the guide tube.
【００１６】また、上記円板部材をフッ素をドープした
ＳｉＯ2で構成し、上記ガイド管を純ＳｉＯ2で構成して
もよい。The disc member may be made of fluorine-doped SiO 2 and the guide tube may be made of pure SiO 2 .
【００１７】以上の構成によれば、長尺で、かつ、ＰＢ
Ｇ構造の精度が高いフォトニッククリスタル光ファイバ
母材が得られる。According to the above construction, the PB is long and long.
A photonic crystal optical fiber preform having a high G structure precision can be obtained.
【００１８】一方、本発明に係るフォトニッククリスタ
ル光ファイバは、前述したフォトニッククリスタル光フ
ァイバ母材に線引き加工を施してなるものである。On the other hand, the photonic crystal optical fiber according to the present invention is formed by drawing the above-mentioned photonic crystal optical fiber preform.
【００１９】以上の構成によれば、低伝送損失で、か
つ、安価なフォトニッククリスタル光ファイバを得るこ
とができる。According to the above construction, it is possible to obtain an inexpensive photonic crystal optical fiber with low transmission loss.
【００２０】[0020]
【発明の実施の形態】以下、本発明の好適一実施の形態
を添付図面に基いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
【００２１】ＳｉＯ2母材の斜視外観図を図１に、円板
部材の斜視外観図を図２に、円板部材を固定治具で固定
した状態を示す断面図を図３に、第１の実施の形態に係
るフォトニッククリスタル光ファイバ母材の斜視外観図
を図４に示す。FIG. 1 is a perspective external view of the SiO 2 base material, FIG. 2 is a perspective external view of the disk member, and FIG. 3 is a sectional view showing a state where the disk member is fixed by a fixing jig. FIG. 4 is a perspective external view of the photonic crystal optical fiber preform according to the embodiment of FIG.
【００２２】第１の実施の形態に係るＰＣＦ母材の製造
方法は、先ず、図１に示すように、ＶＡＤ法などで製造
したＳｉＯ2母材１１を所定の厚さにスライスし、１つ
のＳｉＯ2母材１１から複数枚（図１中では５枚）の円
板部材２１を作製する。その後、図２に示すように、各
円板部材２１の中央部２３の周りに、少なくとも１つ
（図２中では、同心円上に、かつ、等間隔に４つ）の貫
通孔２５を形成する。In the method of manufacturing a PCF base material according to the first embodiment, first, as shown in FIG. 1, a SiO 2 base material 11 manufactured by the VAD method or the like is sliced into a predetermined thickness to obtain one piece. A plurality of (five in FIG. 1) disk members 21 are produced from the SiO 2 base material 11. After that, as shown in FIG. 2, at least one (four concentric circles and four at regular intervals in FIG. 2) through holes 25 are formed around the central portion 23 of each disc member 21. .
【００２３】次に、図３に示すように、円盤状の底部材
３２ａ，蓋部材３２ｃ及び円筒状の側壁部材３２ｂから
なる固定治具３２を用意し、複数枚（図３中では１０
枚）の円板部材２１を側壁部材３２ｂ内に配置・積層さ
せて積層体３１を作製する。この時、円板部材２１の配
置・積層枚数は、ＳｉＯ2母材１１から円板部材２１を
切り出す枚数よりも多くすることは言うまでもない。ま
た、各円板部材２１の貫通孔２５が連通すべく、各円板
部材２１の貫通孔２５の位置を合わせて配置・積層す
る。Next, as shown in FIG. 3, a fixing jig 32 comprising a disk-shaped bottom member 32a, a lid member 32c and a cylindrical side wall member 32b is prepared, and a plurality of fixing jigs (10 in FIG. 3) are prepared.
The disk members 21 of (one) are arranged and laminated in the side wall member 32b to produce the laminated body 31. At this time, it goes without saying that the number of arranged and laminated disc members 21 is larger than the number of disc members 21 cut out from the SiO 2 base material 11. Further, the through holes 25 of each disk member 21 are arranged and stacked so that the through holes 25 of each disk member 21 are aligned with each other so that the through holes 25 of each disk member 21 communicate with each other.
【００２４】その後、固定治具３２ごと積層体３１を加
熱炉内に配置すると共に、所定の温度、時間の焼結処理
を施し、各円板部材２１を一体に形成する。これによっ
て、図４に示すように、ＳｉＯ2で構成されるコア４３
の周りにクラッド部４４を有し、かつ、クラッド部４４
におけるコア４３の周りに４つの貫通孔４５からなるフ
ォトニック結晶構造を有する第１の実施の形態のＰＣＦ
母材４１が得られる。ここで、得られたＰＣＦ母材４１
において、各貫通孔４５に軸ズレや変形があった場合、
各貫通孔４５の内面に、適宜、研削加工を施してもよ
い。After that, the laminated body 31 together with the fixing jig 32 is placed in a heating furnace, and a sintering process is performed at a predetermined temperature for a predetermined time to integrally form the disc members 21. As a result, as shown in FIG. 4, the core 43 composed of SiO 2 is formed.
Has a clad portion 44 around the
PCF of the first embodiment having a photonic crystal structure consisting of four through holes 45 around the core 43 in
The base material 41 is obtained. Here, the obtained PCF base material 41
In the case where there is an axial displacement or deformation in each through hole 45,
The inner surface of each through hole 45 may be appropriately ground.
【００２５】このＰＣＦ母材４１をプレフォームとし、
ＰＣＦ母材４１に対して所定の張力を付与した状態で線
引き加工を施すことで、コアの周りのクラッド部に長手
方向全長に亘る４つの貫通路を有するＰＣＦが得られ
る。この時、ＰＣＦの貫通路の径が所望の径となるよう
に、ＰＣＦ母材４１における各貫通孔４５内の圧力を調
整して最適化を図り、その後、線引き加工を行う。This PCF base material 41 is used as a preform,
By performing the drawing process on the PCF base material 41 in a state in which a predetermined tension is applied, a PCF having four through paths extending along the entire length in the longitudinal direction is obtained in the clad portion around the core. At this time, the pressure in each through hole 45 in the PCF base material 41 is adjusted and optimized so that the diameter of the PCF through passage becomes a desired diameter, and then wire drawing is performed.
【００２６】円板部材２１の軸方向厚さは特に限定する
ものではないが、２０〜１００ｍｍが好ましく、特に５
０ｍｍ前後が好ましい。The axial thickness of the disc member 21 is not particularly limited, but is preferably 20 to 100 mm, and particularly 5
Around 0 mm is preferable.
【００２７】次に、本実施の形態の作用を説明する。Next, the operation of this embodiment will be described.
【００２８】本実施の形態の製造方法によれば、中央部
２３の周りに少なくとも１つの貫通孔２５を有した円板
部材２１を複数枚積層して積層体３１を形成すると共
に、各円板部材２１の貫通孔２５を連通させ、その積層
体３１に焼結処理を施して各円板部材２１が一体に形成
されたＰＣＦ母材４１を製造しているため、得られるＰ
ＣＦ母材４１の長さの調整は、円板部材２１の積層枚数
を増減するだけで自在に調整可能であり、その調整が容
易である。すなわち、従来のＰＣＦ母材のように、貫通
孔形成のために用いるドリルの長さによって母材長さが
制限されるということはなく、長尺のＰＣＦ母材４１の
形成が容易である。According to the manufacturing method of the present embodiment, a plurality of disc members 21 having at least one through hole 25 around the central portion 23 are laminated to form a laminated body 31, and each disc is formed. Since the through holes 25 of the member 21 are communicated with each other and the laminated body 31 is subjected to the sintering treatment to manufacture the PCF base material 41 in which the respective disk members 21 are integrally formed, the obtained P is obtained.
The length of the CF base material 41 can be adjusted freely by simply increasing or decreasing the number of laminated disk members 21, and the adjustment is easy. That is, unlike the conventional PCF base material, the base material length is not limited by the length of the drill used for forming the through holes, and the long PCF base material 41 can be easily formed.
【００２９】また、円板部材２１の軸方向厚さは最大で
も約１００ｍｍであるため、円板部材２１に貫通孔２５
を形成する形成手段として、ドリルの他に、より高精度
な加工が可能な研削装置を用いることができる。Since the disk member 21 has a maximum axial thickness of about 100 mm, the disk member 21 has a through hole 25.
In addition to a drill, a grinding device capable of more highly precise processing can be used as a forming means for forming the.
【００３０】さらに、外径が大きなＰＣＦ母材４１を製
造する場合、その貫通孔４５の径も大きく形成する必要
がある。このため、ＰＣＦ母材４１の製造に用いる円板
部材２１の外径及びその貫通孔２５の径も大きく形成す
る必要がある。しかし、円板部材２１の軸方向厚さは最
大でも約１００ｍｍであるため、径の大きな貫通孔２５
であっても高精度に、かつ、容易に形成することができ
る。よって、外径が大きなＰＣＦ母材４１を製造する場
合であっても、加工精度の高い貫通孔４５を形成するこ
とができる。Further, when the PCF base material 41 having a large outer diameter is manufactured, it is necessary to form the through hole 45 having a large diameter. Therefore, it is necessary to form the outer diameter of the disc member 21 used for manufacturing the PCF base material 41 and the diameter of the through hole 25 to be large. However, since the axial thickness of the disc member 21 is about 100 mm at the maximum, the through hole 25 having a large diameter is formed.
Even in this case, it can be formed with high accuracy and easily. Therefore, even when the PCF base material 41 having a large outer diameter is manufactured, the through hole 45 with high processing accuracy can be formed.
【００３１】また、各貫通孔４５の加工精度が高く、か
つ、長尺のＰＣＦ母材４１を容易に得ることができるた
め、このＰＣＦ母材４１を用いてＰＣＦを製造すれば、
従来のＰＣＦ母材を用いてＰＣＦを製造する場合と比較
して、一工程で得られるＰＣＦの長さが著しく長くな
り、その結果、ＰＣＦの製造コストの低減を図ることが
できる。Further, the processing accuracy of each through hole 45 is high, and a long PCF base material 41 can be easily obtained. Therefore, if a PCF is manufactured using this PCF base material 41,
The length of the PCF obtained in one step is significantly longer than that in the case of manufacturing the PCF using the conventional PCF base material, and as a result, the manufacturing cost of the PCF can be reduced.
【００３２】次に、本発明の他の実施の形態を添付図面
に基いて説明する。Next, another embodiment of the present invention will be described with reference to the accompanying drawings.
【００３３】円板部材とガイド管との関係を示す斜視外
観図を図５に、第２の実施の形態に係るフォトニックク
リスタル光ファイバ母材の斜視外観図を図６に示す。
尚、図１〜図３と同様の部材には同じ符号を付し、詳細
な説明は省略する。FIG. 5 is a perspective external view showing the relationship between the disk member and the guide tube, and FIG. 6 is a perspective external view of the photonic crystal optical fiber preform according to the second embodiment.
The same members as those in FIGS. 1 to 3 are designated by the same reference numerals, and detailed description thereof will be omitted.
【００３４】第２の実施の形態に係るＰＣＦ母材の製造
方法は、先ず、前実施の形態の製造方法と同様にして、
貫通孔２５を有する円板部材２１を作製する。In the method of manufacturing the PCF base material according to the second embodiment, first, in the same manner as the manufacturing method of the previous embodiment,
The disk member 21 having the through holes 25 is manufactured.
【００３５】次に、図３に示すように、円盤状の底部材
３２ａ，蓋部材３２ｃ及び円筒状の側壁部材３２ｂから
なる固定治具３２を用意し、複数枚（図３中では１０
枚）の円板部材２１を側壁部材３２ｂ内に配置・積層さ
せて積層体３１を作製する。この時、円板部材２１の配
置・積層枚数は、ＳｉＯ2母材１１から円板部材２１を
切り出す枚数よりも多くすることは言うまでもない。ま
た、各円板部材２１の貫通孔２５が連通すべく、図５に
示すように、ある円板部材２１の各貫通孔２５に、円板
部材２１と同じ材料で構成したガイド管５１をそれぞれ
嵌合挿通し、その後、ある円板部材２１に固定された各
ガイド管５１の位置に各貫通孔２５の位置を合わせて、
残りの円板部材２１を、順次、配置・積層する。Next, as shown in FIG. 3, a fixing jig 32 comprising a disk-shaped bottom member 32a, a lid member 32c and a cylindrical side wall member 32b is prepared, and a plurality of fixing jigs (10 in FIG. 3) are prepared.
The disk members 21 of (one) are arranged and laminated in the side wall member 32b to produce the laminated body 31. At this time, it goes without saying that the number of arranged and laminated disc members 21 is larger than the number of disc members 21 cut out from the SiO 2 base material 11. Further, in order to allow the through holes 25 of each disc member 21 to communicate with each other, as shown in FIG. 5, a guide tube 51 made of the same material as the disc member 21 is provided in each through hole 25 of a certain disc member 21, respectively. Fitting and inserting, and then aligning the position of each through hole 25 with the position of each guide tube 51 fixed to a certain disc member 21,
The remaining disk members 21 are sequentially arranged and laminated.
【００３６】その後、固定治具３２ごと積層体３１を加
熱炉内に配置すると共に、所定の温度、時間の焼結処理
を施し、各円板部材２１及び各ガイド管５１を一体に形
成する。これによって、図６に示すように、ＳｉＯ2で
構成されるコア６３の周りにクラッド部６４を有し、か
つ、クラッド部６４におけるコア６３の周りに４つの貫
通孔６５からなるフォトニック結晶構造を有する第２の
実施の形態のＰＣＦ母材６１が得られる。ここで、得ら
れたＰＣＦ母材６１において、各ガイド管５１の内周面
が、各貫通孔６５の周面を形成している。After that, the laminated body 31 together with the fixing jig 32 is placed in a heating furnace and subjected to a sintering treatment at a predetermined temperature for a predetermined time to integrally form the disc members 21 and the guide tubes 51. As a result, as shown in FIG. 6, a photonic crystal structure having a clad 64 around a core 63 made of SiO 2 and four through holes 65 around the core 63 in the clad 64. The PCF base material 61 of the second embodiment having is obtained. Here, in the obtained PCF base material 61, the inner peripheral surface of each guide tube 51 forms the peripheral surface of each through hole 65.
【００３７】このＰＣＦ母材６１をプレフォームとし、
ＰＣＦ母材６１に対して所定の張力を付与した状態で線
引き加工を施すことで、コアの周りのクラッド部に長手
方向全長に亘る４つの貫通路を有するＰＣＦが得られ
る。この時、ＰＣＦの貫通路の径が所望の径となるよう
に、ＰＣＦ母材６１における各貫通孔６５内の圧力を調
整して最適化を図り、その後、線引き加工を行う。This PCF base material 61 is used as a preform,
By performing the drawing process on the PCF base material 61 in a state in which a predetermined tension is applied, a PCF having four through paths extending along the entire length in the longitudinal direction is obtained in the clad portion around the core. At this time, the pressure in each through hole 65 in the PCF base material 61 is adjusted and optimized so that the diameter of the PCF through passage becomes a desired diameter, and then wire drawing is performed.
【００３８】ここで、円板部材２１とガイド管５１との
組み合わせとしては、円板部材２１がフッ素をドープし
たＳｉＯ2、ガイド管５１が純ＳｉＯ2などが挙げられ
る。ＳｉＯ2にフッ素をドープする等の方法により、円
板部材２１の融点を純ＳｉＯ2の融点よりも低くするこ
とができ、その結果、ガイド管５１の融点が円板部材２
１の融点よりも高くなる。Here, as a combination of the disk member 21 and the guide tube 51, the disk member 21 may be fluorine-doped SiO 2 , the guide tube 51 may be pure SiO 2, and the like. The melting point of the disk member 21 can be made lower than the melting point of pure SiO 2 by a method such as doping SiO 2 with fluorine. As a result, the melting point of the guide tube 51 is increased.
Higher than the melting point of 1.
【００３９】次に、本実施の形態の作用を説明する。Next, the operation of this embodiment will be described.
【００４０】本実施の形態の製造方法においては、ガイ
ド管５１の融点を円板部材２１の融点よりも高くしてい
るため、積層体３１に焼結処理を施す際、各円板部材２
１に収縮が生じたとしても、ガイド管５１には収縮は生
じない。つまり、焼結処理の際、各円板部材２１の収縮
により、各貫通孔２５の周面とガイド管５１の外周面と
が強固に一体化するが、各ガイド管５１の大部分は未溶
融であるため、各ガイド管５１に変形が生じることはな
い。よって、本実施の形態の製造方法によれば、得られ
たＰＣＦ母材６１において、各貫通孔６５に軸ズレや変
形が生じることはなく、その結果、各貫通孔６５の内面
に研削加工を施すことなく、加工精度が高い貫通孔６５
を有したＰＣＦ母材６１（高精度のＰＢＧ構造を有した
ＰＣＦ母材６１）を得ることができる。In the manufacturing method of the present embodiment, since the melting point of the guide tube 51 is set higher than that of the disc member 21, each disc member 2 is subjected to the sintering treatment when the laminated body 31 is sintered.
Even if 1 is contracted, the guide tube 51 is not contracted. That is, during the sintering process, the peripheral surface of each through hole 25 and the outer peripheral surface of the guide tube 51 are firmly integrated due to the contraction of each disk member 21, but most of each guide tube 51 is not melted. Therefore, each guide tube 51 is not deformed. Therefore, according to the manufacturing method of the present embodiment, in the obtained PCF base material 61, no axial deviation or deformation occurs in each through hole 65, and as a result, the inner surface of each through hole 65 is ground. Through hole 65 with high processing accuracy without performing
It is possible to obtain a PCF base material 61 having (a PCF base material 61 having a highly accurate PBG structure).
【００４１】また、本実施の形態の製造方法において
も、前実施の形態の製造方法と同様の作用効果が得られ
ることは勿論のことである。Further, it goes without saying that the manufacturing method of the present embodiment can also obtain the same operational effects as those of the manufacturing method of the previous embodiment.
【００４２】以上、本発明の実施の形態は、上述した実
施の形態に限定されるものではなく、他にも種々のもの
が想定されることは言うまでもない。It is needless to say that the embodiments of the present invention are not limited to the above-mentioned embodiments, and various other embodiments are possible.
【００４３】[0043]
【実施例】（実施例１）直径５０ｍｍの全合成ＳｉＯ2
母材をＶＡＤ法により複数本作製する。各ＳｉＯ2母材
をガラスカッターを用いて厚さ約５０ｍｍにスライス
し、円板部材を作製する。各円板部材の両端面に端面加
工を施した後、各円板部材の中央部の周りに、径２．０
ｍｍの貫通孔を、同心円上に、かつ、等間隔に４つ形成
する。[Example] (Example 1) Total synthetic SiO 2 having a diameter of 50 mm
A plurality of base materials are produced by the VAD method. A disk member is manufactured by slicing each SiO 2 base material into a thickness of about 50 mm using a glass cutter. After performing end face processing on both end faces of each disc member, a diameter of 2.0
Four through holes of mm are formed concentrically and at equal intervals.
【００４４】次に、固定治具を用いて、１０枚の円板部
材を配置・積層して積層体を作製する（図３参照）。Next, using a fixing jig, 10 disk members are arranged and laminated to produce a laminated body (see FIG. 3).
【００４５】その後、積層体が互いに離れないように固
定治具で固定し、その状態で固定治具ごと電気炉内に配
置し、１５００℃×６時間の焼結処理を施して、各円板
部材を一体に形成する。この一体形成物における各貫通
孔の内面に研削加工を施して、外径が５０ｍｍ、貫通孔
径が２．０ｍｍ、全長が５００ｍｍのＰＣＦ母材（図４
参照）を作製する。After that, the laminates were fixed by a fixing jig so that they would not separate from each other, and in that state, the fixing jig was placed in an electric furnace and subjected to a sintering treatment at 1500 ° C. for 6 hours, and then each disc was placed. The member is integrally formed. The inner surface of each through hole in this integrally formed product is ground to obtain a PCF base material having an outer diameter of 50 mm, a through hole diameter of 2.0 mm, and an overall length of 500 mm (see FIG. 4).
Reference).
【００４６】このＰＣＦ母材に対し、約０．４９Ｎ（５
×１０-2ｋｇｆ）の張力で、線引速度１００ｍ／ｍｉｎ
の線引き加工を施すことで、コアの周りのクラッド部に
長手方向全長に亘る４つの貫通路を有し、全長が約７０
ｋｍ、外径が１２５μｍ、貫通路の径が５μｍのＰＣＦ
が得られる。About 0.49 N (5
× 10 -2 kgf) with a drawing speed of 100 m / min
As a result of the wire drawing process, the clad part around the core has four through passages along the entire length in the longitudinal direction, and the total length is about 70.
PCF with km, outer diameter of 125 μm, and through passage diameter of 5 μm
Is obtained.
【００４７】得られたＰＣＦについて特性評価を行った
結果、ゼロ分散波長は８１０ｎｍ、カットオフ波長は７
８０ｎｍ、伝送損失は、波長８００ｎｍで１．５ｄＢ／
ｋｍ、波長１５５０ｎｍで１．０ｄＢ／ｋｍであり、良
好な伝送特性（低伝送損失）が得られた。The characteristics of the obtained PCF were evaluated. As a result, the zero dispersion wavelength was 810 nm and the cutoff wavelength was 7.
80nm, transmission loss is 1.5dB / at wavelength 800nm
It was 1.0 dB / km at a wavelength of 1550 nm and good transmission characteristics (low transmission loss) were obtained.
【００４８】（実施例２）実施例１と同様に、ＶＡＤ法
による全合成過程でフッ素をドープしたフッ素ソープＳ
ｉＯ2で作製した各円板部材の両端面に端面加工を施し
た後、各円板部材の中央部の周りに、径４．０ｍｍの貫
通孔を、同心円上に、かつ、等間隔に４つ形成する。(Example 2) As in Example 1, fluorine-doped soap S doped with fluorine in the whole synthesis process by the VAD method.
It was subjected to end face processing on both end faces of the disc member manufactured in iO 2, around the central portion of the disc member, a through hole of diameter 4.0 mm, concentrically and at equal intervals 4 Form one.
【００４９】次に、固定治具を用いて、１０枚の円板部
材を配置・積層して積層体を作製する（図３参照）。こ
こで、円板部材を配置・積層する際、円板部材の各貫通
孔に、全合成種ＳｉＯ2からなり、外径が３．８〜３．
９ｍｍ、内径が２．０ｍｍのガイド管をそれぞれ嵌合挿
通し、各円板部材間で貫通孔の位置を合わせる。Next, using a fixing jig, 10 disk members are arranged and laminated to produce a laminated body (see FIG. 3). Here, when arranging and stacking the disc members, each through hole of the disc members is made of all-synthesized SiO 2 and has an outer diameter of 3.8 to 3.
The guide tubes having a diameter of 9 mm and an inner diameter of 2.0 mm are fitted and inserted, and the positions of the through holes are aligned between the disc members.
【００５０】その後、積層体が互いに離れないように固
定治具で固定し、その状態で固定治具ごと電気炉内に配
置し、１６００℃×６時間の焼結処理を施して、各円板
部材を一体に形成する。これによって、外径が５０ｍ
ｍ、貫通孔径が２．０ｍｍ、全長が５００ｍｍのＰＣＦ
母材（図６参照）を作製する。Thereafter, the laminates were fixed with a fixing jig so that they would not separate from each other, and in that state, the fixing jig was placed in an electric furnace and subjected to a sintering treatment at 1600 ° C. for 6 hours to obtain each disc. The member is integrally formed. With this, the outer diameter is 50m
PCF with m, through hole diameter of 2.0 mm, and total length of 500 mm
A base material (see FIG. 6) is produced.
【００５１】実施例２のＰＣＦ母材について貫通孔を評
価した結果、各円板部材を一体に形成しただけで、すな
わち各貫通孔の内面に研削加工を施さなくても、実施例
１のＰＣＦ母材における貫通孔と同等の精度が得られ
た。As a result of evaluating the through holes of the PCF base material of Example 2, the PCFs of Example 1 were formed only by integrally forming the respective disk members, that is, without grinding the inner surface of each through hole. The same accuracy as that of the through holes in the base material was obtained.
【００５２】[0052]
【発明の効果】以上要するに本発明によれば、次のよう
な優れた効果を発揮する。
（１） 長尺で、かつ、ＰＢＧ構造の精度が高いフォト
ニッククリスタル光ファイバ母材を容易に得ることがで
きる。
（２） （１）のフォトニッククリスタル光ファイバ母
材を用いることで、低伝送損失で、かつ、安価なフォト
ニッククリスタル光ファイバを得ることができる。In summary, according to the present invention, the following excellent effects are exhibited. (1) It is possible to easily obtain a photonic crystal optical fiber preform that is long and has a highly accurate PBG structure. (2) By using the photonic crystal optical fiber preform of (1), it is possible to obtain an inexpensive photonic crystal optical fiber with low transmission loss.
【図１】ＳｉＯ2母材の斜視外観図である。FIG. 1 is a perspective external view of a SiO 2 base material.
【図２】円板部材の斜視外観図である。FIG. 2 is a perspective external view of a disc member.
【図３】円板部材を固定治具で固定した状態を示す断面
図である。FIG. 3 is a cross-sectional view showing a state where the disc member is fixed by a fixing jig.
【図４】第１の実施の形態に係るフォトニッククリスタ
ル光ファイバ母材の斜視外観図である。FIG. 4 is a perspective external view of a photonic crystal optical fiber preform according to the first embodiment.
【図５】円板部材とガイド管との関係を示す斜視外観図
である。FIG. 5 is a perspective external view showing the relationship between the disc member and the guide tube.
【図６】第２の実施の形態に係るフォトニッククリスタ
ル光ファイバ母材の斜視外観図である。FIG. 6 is a perspective external view of a photonic crystal optical fiber preform according to a second embodiment.
２１ 円板部材
２５ 貫通孔
３１ 積層体
４１，６１ ＰＣＦ母材（フォトニッククリスタル光フ
ァイバ母材）
４３，６３ コア
４４，６４ クラッド部
４５，６５ 貫通孔（フォトニック結晶構造）
５１ ガイド管21 Disc Member 25 Through Hole 31 Laminated Body 41, 61 PCF Base Material (Photonic Crystal Optical Fiber Base Material) 43, 63 Core 44, 64 Clad Part 45, 65 Through Hole (Photonic Crystal Structure) 51 Guide Tube
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小谷 賢吾 東京都千代田区大手町一丁目６番１号 日 立電線株式会社内 (72)発明者 大薗 和正 東京都千代田区大手町一丁目６番１号 日 立電線株式会社内 (72)発明者 姚 兵 東京都千代田区大手町一丁目６番１号 日 立電線株式会社内 Ｆターム(参考） 2H050 AC62 4G021 BA00 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kengo Otani 1-6-1, Otemachi, Chiyoda-ku, Tokyo Standing Wire Co., Ltd. (72) Inventor Kazumasa Ozono 1-6-1, Otemachi, Chiyoda-ku, Tokyo Standing Wire Co., Ltd. (72) Inventor 1-6-1, Otemachi, Chiyoda-ku, Tokyo Standing Wire Co., Ltd. F-term (reference) 2H050 AC62 4G021 BA00
Claims (6)
ッド部を有し、かつ、クラッド部のコア近傍にフォトニ
ック結晶構造を有するフォトニッククリスタル光ファイ
バ母材の製造方法において、ＳｉＯ2で構成される円板
部材の中央部近傍に少なくとも１つの貫通孔を形成し、
その円板部材を複数枚積層して積層体を形成すると共
に、各円板部材の貫通孔を連通させ、その積層体に焼結
処理を施して各円板部材を一体に形成することを特徴と
するフォトニッククリスタル光ファイバ母材の製造方
法。1. A has a cladding portion around the core composed of SiO 2, and a method of manufacturing a photonic crystal optical fiber preform having a photonic crystal structure in the core near the clad portion, of SiO 2 Forming at least one through hole in the vicinity of the central portion of the disk member to be constructed,
A plurality of the disc members are laminated to form a laminated body, the through holes of the respective disc members are made to communicate with each other, and the laminated body is sintered to integrally form the respective disc members. Photonic crystal optical fiber preform manufacturing method.
ッド部を有し、かつ、クラッド部のコア近傍にフォトニ
ック結晶構造を有するフォトニッククリスタル光ファイ
バ母材の製造方法において、ＳｉＯ2で構成される円板
部材の中央部近傍に少なくとも１つの貫通孔を形成し、
その貫通孔に円板部材と同じ材料で構成したガイド管を
嵌合挿通し、そのガイド管に貫通孔の位置を合わせて円
板部材を複数枚積層して積層体を形成し、その積層体に
焼結処理を施して各円板部材及びガイド管を一体に形成
することを特徴とするフォトニッククリスタル光ファイ
バ母材の製造方法。2. A has a cladding portion around the core composed of SiO 2, and a method of manufacturing a photonic crystal optical fiber preform having a photonic crystal structure in the core near the clad portion, of SiO 2 Forming at least one through hole in the vicinity of the central portion of the disk member to be constructed,
A guide tube made of the same material as the disc member is fitted and inserted into the through hole, the through holes are aligned with the guide tube, and a plurality of disc members are laminated to form a laminated body. A method for manufacturing a photonic crystal optical fiber preform, comprising subjecting each disk member and the guide tube to an integral body by subjecting the disc to a sintering treatment.
ッド部を有し、かつ、クラッド部のコア近傍にフォトニ
ック結晶構造を有するフォトニッククリスタル光ファイ
バ母材において、ＳｉＯ2で構成される円板部材の中央
部近傍に少なくとも１つの貫通孔を形成し、その円板部
材を複数枚積層して積層体を形成すると共に、各円板部
材の貫通孔を連通させ、その積層体に焼結処理を施して
各円板部材を一体に形成してなることを特徴とするフォ
トニッククリスタル光ファイバ母材。3. A photonic crystal optical fiber preform having a cladding around a core made of SiO 2 and having a photonic crystal structure near the core of the cladding, made of SiO 2 . At least one through hole is formed in the vicinity of the central portion of the disk member, a plurality of the disk members are laminated to form a laminated body, and the through holes of the respective disk members are made to communicate with each other to form a laminated body. A photonic crystal optical fiber preform, which is obtained by subjecting each disk member to an integral process by subjecting it to a binding treatment.
ッド部を有し、かつ、クラッド部のコア近傍にフォトニ
ック結晶構造を有するフォトニッククリスタル光ファイ
バ母材において、ＳｉＯ2で構成される円板部材の中央
部近傍に少なくとも１つの貫通孔を形成し、その貫通孔
に円板部材と同じ材料で構成したガイド管を嵌合挿通
し、そのガイド管に貫通孔の位置を合わせて円板部材を
複数枚積層して積層体を形成し、その積層体に焼結処理
を施して各円板部材及びガイド管を一体に形成してなる
ことを特徴とするフォトニッククリスタル光ファイバ母
材。4. A photonic crystal optical fiber preform having a clad portion around a core made of SiO 2 and having a photonic crystal structure near the core of the clad portion, made of SiO 2 . At least one through hole is formed in the vicinity of the central portion of the disk member, and a guide tube made of the same material as the disk member is fitted and inserted into the through hole, and the through hole is aligned with the guide tube to form a circle. A photonic crystal optical fiber preform characterized in that a plurality of plate members are laminated to form a laminated body, and the laminated body is sintered to integrally form each disc member and a guide tube. .
Ｏ2で構成し、上記ガイド管を純ＳｉＯ2で構成した請求
項４記載のフォトニッククリスタル光ファイバ母材。5. The fluorine-doped Si for the disk member
The photonic crystal optical fiber preform according to claim 4, wherein the guide tube is made of O 2 and the guide tube is made of pure SiO 2 .
ニッククリスタル光ファイバ母材に線引き加工を施して
なることを特徴とするフォトニッククリスタル光ファイ
バ。6. A photonic crystal optical fiber obtained by subjecting the photonic crystal optical fiber preform according to any one of claims 3 to 5 to a drawing process.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005076047A1 (en) * | 2004-02-06 | 2005-08-18 | Matthew Henderson | Optical product with integral terminal part |
| EP2840423A1 (en) * | 2013-08-20 | 2015-02-25 | Kohoku Kogyo Co., Ltd. | Optical connector, method for manufacturing the same, and mold container for manufacturing the same |
| WO2015133239A1 (en) * | 2014-03-06 | 2015-09-11 | 古河電気工業株式会社 | Production method for optical fiber parent material, and production method for optical fiber |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001084198A1 (en) * | 2000-05-01 | 2001-11-08 | Sumitomo Electric Industries, Ltd. | Optical fiber and method for manufacturing the same |
| JP2002145634A (en) * | 2000-08-30 | 2002-05-22 | Sumitomo Electric Ind Ltd | Method of manufacturing optical fiber and optical fiber |
| JP2002249335A (en) * | 2001-02-21 | 2002-09-06 | Sumitomo Electric Ind Ltd | Method for producing optical fiber, optical fiber and optical communication system |
-
2002
- 2002-04-17 JP JP2002114988A patent/JP3962277B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001084198A1 (en) * | 2000-05-01 | 2001-11-08 | Sumitomo Electric Industries, Ltd. | Optical fiber and method for manufacturing the same |
| JP2002145634A (en) * | 2000-08-30 | 2002-05-22 | Sumitomo Electric Ind Ltd | Method of manufacturing optical fiber and optical fiber |
| JP2002249335A (en) * | 2001-02-21 | 2002-09-06 | Sumitomo Electric Ind Ltd | Method for producing optical fiber, optical fiber and optical communication system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005076047A1 (en) * | 2004-02-06 | 2005-08-18 | Matthew Henderson | Optical product with integral terminal part |
| EP2840423A1 (en) * | 2013-08-20 | 2015-02-25 | Kohoku Kogyo Co., Ltd. | Optical connector, method for manufacturing the same, and mold container for manufacturing the same |
| US9703035B2 (en) | 2013-08-20 | 2017-07-11 | Kohoku Kogyo Co., Ltd. | Optical connector, method for manufacturing the same, and mold container for manufacturing the same |
| WO2015133239A1 (en) * | 2014-03-06 | 2015-09-11 | 古河電気工業株式会社 | Production method for optical fiber parent material, and production method for optical fiber |
| JP2015168597A (en) * | 2014-03-06 | 2015-09-28 | 古河電気工業株式会社 | Method for manufacturing optical fiber preform and method for manufacturing optical fiber |
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| Publication number | Publication date |
|---|---|
| JP3962277B2 (en) | 2007-08-22 |
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