JP2002185063A - Rare earth element-doped optical fiber, and optical device using it - Google Patents

Rare earth element-doped optical fiber, and optical device using it

Info

Publication number
JP2002185063A
JP2002185063A JP2000380487A JP2000380487A JP2002185063A JP 2002185063 A JP2002185063 A JP 2002185063A JP 2000380487 A JP2000380487 A JP 2000380487A JP 2000380487 A JP2000380487 A JP 2000380487A JP 2002185063 A JP2002185063 A JP 2002185063A
Authority
JP
Japan
Prior art keywords
optical fiber
core
rare earth
doped
rare
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
Application number
JP2000380487A
Other languages
Japanese (ja)
Other versions
JP4134511B2 (en
Inventor
Katsuyuki Imoto
克之 井本
Original Assignee
Hitachi Cable Ltd
日立電線株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Cable Ltd, 日立電線株式会社 filed Critical Hitachi Cable Ltd
Priority to JP2000380487A priority Critical patent/JP4134511B2/en
Publication of JP2002185063A publication Critical patent/JP2002185063A/en
Application granted granted Critical
Publication of JP4134511B2 publication Critical patent/JP4134511B2/en
Application status is Expired - Fee Related legal-status Critical
Anticipated expiration legal-status Critical

Links

Abstract

PROBLEM TO BE SOLVED: To provide a rare earth element-doped optical fiber where the confinement efficiency of signals and excitation light has been improved, and to provide an optical device using the optical fiber. SOLUTION: Since a hollow section 13 is formed at the center of a core 11 doped with rare earth elements, relative index difference can be increased greatly, and signal light and excitation light are confined at a core region doped with the rare earth elements for propagation and amplification, thus obtaining a high-efficiency and high-gain amplifier. Since light can be distributed into each core 11 for propagation and amplification, nonlinear effect cannot occur easily even if the signal light with large power is inputted. Not only the signal light but also the excitation light are efficiently coupled into the core 11 and are confined and propagated, thus possibly achieving further efficient optical amplifier.

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、希土類元素添加光ファイバ及びそれを用いた光デバイスに関する。 BACKGROUND OF THE INVENTION The present invention relates to an optical device using doped optical fibers and it rare earth elements.

【0002】 [0002]

【従来の技術】図6は本発明者が先に提案した希土類元素添加光ファイバの断面図である。 BACKGROUND ART FIG. 6 is a sectional view of the present invention's rare-earth-element-doped optical fiber previously proposed.

【0003】この希土類元素添加光ファイバ1は、希土類元素が添加された複数のコア2と、コア2より屈折率が低くコア2の束を覆う略円形断面形状のクラッド3とで構成されたものである。 [0003] The rare-earth-element-doped optical fiber 1, as a rare earth element and a plurality of cores 2 that are added, the refractive index than the core 2 is constituted by a substantially circular cross-sectional shape cladding 3 of which covers the bundle of the core 2 low it is.

【0004】図7は本発明者が先に提案した他の希土類元素添加光ファイバの断面図である。 [0004] FIG. 7 is a sectional view of the present invention's other rare-earth-element-doped optical fiber previously proposed.

【0005】この希土類元素添加光ファイバ4は、希土類元素が添加された複数のコア5と、コア5及びクラッド7より屈折率が低く各コア5をそれぞれ覆う中間層6 [0005] The rare-earth-element-doped optical fiber 4, a plurality of cores 5 doped with a rare earth element, an intermediate layer covering each core 5 has a refractive index lower than the core 5 and the cladding 7, respectively 6
と、コア5より屈折率が低く中間層6で覆われたコア5 When the core 5 having a refractive index than the core 5 is covered with the intermediate layer 6 low
の束を覆う略円形断面形状のクラッド7とで構成されたものである。 Substantially covering the bunch is obtained is composed of a clad 7 of a circular cross-sectional shape. この希土類元素添加光ファイバ4は、コア5の外周に中間層6を設けることにより、コア5への光の閉込め性を向上させたものである。 The rare-earth-element-doped optical fiber 4, by providing the intermediate layer 6 on the outer periphery of the core 5, but with improved confinement of the light into the core 5.

【0006】これらの希土類元素添加光ファイバ1、4 [0006] These rare-earth-element-doped optical fiber 1, 4
はいずれも略円形断面形状のクラッド3、7内の中央部に、希土類元素を添加した高屈折率のコア2、5を複数本設けたものであり、各コア2、5の外径、コア間隔、 The center of the cladding 3,7 are both substantially circular cross section, which core 2,5 of high refractive index doped with a rare earth element was plural provided, the outer diameter of the core 2, 5, the core interval,
コア2、5とクラッド3、7との比屈折率差等を最適化することにより、光増幅器用の光ファイバとして作用するようになっている。 By optimizing the relative refractive index differentially between the core 2 and 5 and the cladding 3,7, so as to act as an optical fiber for optical amplifier. 尚、コア2、5の本数はいずれも数本から数十本用いられる。 The number of the core 2, 5 are used several tens of several none.

【0007】 [0007]

【発明が解決しようとする課題】しかしながら、図6及び図7に示した希土類元素添加マルチコアファイバや従来の希土類元素単一コアファイバを用いた光ファイバ増幅器には以下のような課題がある。 [SUMMARY OF THE INVENTION However, the optical fiber amplifier using a rare earth element doped multi-core fiber and the conventional rare earth element single-core fiber shown in FIGS. 6 and 7 has the following problems. (1) 上述した希土類元素添加光ファイバに入力される信号光のパワーが大きくなってくると、ファイバ内で非線形効果が発生して雑音が生じてくるために、大電力パワーの光増幅が困難である。 (1) When the signal light power input to the above-mentioned rare-earth-doped optical fiber becomes large, because the noise coming occur nonlinear effect occurs in the fiber, difficult optical amplification of high-power power it is. (2) コアとクラッドとの比屈折率差を大きくとることが難しいので、Er添加領域に効率良く光を閉じ込めて光増幅することが困難である。 (2) Since it is difficult to increase the relative refractive index difference between the core and the cladding, it is difficult to light amplifying confine light efficiently to the Er-doped region.

【0008】そこで、本発明の目的は、上記課題を解決し、信号光及び励起光の閉込め効率を高くした希土類元素添加光ファイバ及びそれを用いた光デバイスを提供することにある。 An object of the present invention is to provide an optical device using the problems to resolve, the signal light and the pumping light confining high rare earth doped optical fiber and it efficiency.

【0009】 [0009]

【課題を解決するための手段】上記目的を達成するために本発明の希土類元素添加光ファイバは、希土類元素が添加された中空状の複数のコアと、コアより屈折率が低くコアの束を覆う略円形断面形状のクラッドとを備えたものである。 Rare-earth-element-doped optical fiber of the present invention in order to achieve the above object, according to an aspect of has a hollow plurality of cores doped with a rare earth element, a bunch of core lower refractive index than the core those having a clad of substantially circular cross-sectional shape to cover.

【0010】上記構成に加え本発明の希土類元素添加光ファイバは、コア間の隙間に中空部が形成されていてもよい。 [0010] a rare earth element doped optical fiber of the present invention in addition to the above configuration may be hollow portion is formed in the gap between the cores.

【0011】上記構成に加え本発明の希土類元素添加光ファイバは、コアの束をコア及びクラッドより屈折率の低いリング断面形状の中間層で覆ってもよい。 [0011] a rare earth element doped optical fiber of the addition the present invention to the above arrangement, may cover the bundle of core in the middle layer of the lower ring-sectional shape of the refractive index than the core and the cladding.

【0012】上記構成に加え本発明の希土類元素添加光ファイバは、希土類元素としてEr、Nd、Sm、T The rare earth element-doped optical fiber of the addition the present invention to the above configuration, Er as the rare earth element, Nd, Sm, T
m、Yb、Ho、Ce等を少なくとも1種類含んだものを用いるのが好ましい。 m, Yb, Ho, to use those containing at least one of Ce or the like.

【0013】本発明の光ファイバ増幅器は、希土類元素が添加され信号光が伝搬する中空状の複数のコアを、コアより屈折率が低く略円形断面形状のクラッドで覆った希土類元素添加光ファイバと、励起光を発生する少なくとも一つの励起光源と、信号光を増幅すべく励起光源からの励起光を希土類元素添加光ファイバに入力する励起光入力手段とを備えたものである。 [0013] optical fiber amplifier of the present invention, the hollow of a plurality of cores signal light is added rare earth element is propagated, and the rare earth element doped optical fiber covered with a cladding of substantially circular cross-section a lower refractive index than the core , at least one excitation light source for generating excitation light, in which the pumping light from the pumping light source in order to amplify the signal light and a pump light input means for inputting to the rare-earth-element-doped optical fiber.

【0014】希土類元素が添加された中空状の複数のコアを、コアより屈折率が低く略円形断面形状のクラッドで覆った希土類元素添加光ファイバと、希土類元素添加光ファイバの一端側に配置され励起光を発する励起光源と、希土類元素添加光ファイバの一端側に配置され励起光を通過させ希土類元素添加光ファイバ内で発生した誘導放出光を反射して希土類元素添加光ファイバ内に戻す第一のミラーと、希土類元素添加光ファイバの他端側に配置され誘導放出光を反射して希土類元素添加光ファイバ内に戻す第二のミラーと、希土類元素添加光ファイバの他端側に配置され特定の波長のレーザ光を通過させるフィルタとを備えたものである。 [0014] The plurality of cores of hollow doped with a rare earth element, a rare earth doped optical fiber whose refractive index is covered with cladding of substantially circular cross-section lower than the core, it is arranged at one end of the rare-earth-element-doped optical fiber an excitation light source emitting excitation light, the first for reflecting the stimulated emission light generated in the rare-earth-element-doped optical fiber was arranged at one end of the rare-earth-element-doped optical fiber is passed through the excitation light back into the rare-earth-element-doped optical fiber and the mirror, a second mirror back in the rare-earth-element-doped optical fiber to reflect disposed stimulated emission light to the other end of the rare-earth-element-doped optical fiber, identified disposed on the other end of the rare-earth-element-doped optical fiber it is obtained by a filter for passing a laser beam having a wavelength of.

【0015】本発明によれば、希土類元素を添加したコアの中心部が中空になっているので、比屈折率差を極めて大きくとることができ、希土類元素を添加したコア領域に信号光及び励起光を閉じ込めて伝搬、増幅させることが可能となる。 According to the present invention, since the center portion of the core doped with a rare earth element is in the hollow, the relative refractive index difference can take very large, the signal light and excitation in the core region doped with a rare earth element propagating confined light, it is possible to amplify. その結果、高効率、高利得の増幅器が得られる。 As a result, high efficiency, the amplifier of the high gain can be obtained. 光を各希土類元素添加コア内に分配して伝搬、増幅させることができるので、大電力パワーの信号光を入力しても非線形効果が生じにくい。 Propagating light distributed in the rare-earth-doped core, it is possible to amplify, nonlinear effect is unlikely to occur even if the input signal light of the high power power. 信号光ばかりではなく、励起光も希土類元素添加コア内に効率良く結合し、閉じ込められて伝搬していくので、さらに高効率な増幅器を期待することができる。 Not only the signal light, the pumping light is also effectively coupled to earth element doped in the core, since propagated trapped, it is possible to further expect a highly efficient amplifier. また、このような閉込め性を利用することにより、希土類元素を低濃度に長尺にわたって添加したファイバ、すなわち、希土類元素低濃度添加長尺光ファイバを用いた増幅器を構成することにより、励起光を長尺にわたって伝搬させることが可能となり、損失を補償しつつ、あるいは利得を得つつ信号光を伝搬させることが可能となり、光ファイバの非線形現象を抑えた伝送が期待できる。 Further, by using such a confinement property, fiber doped over elongated with a rare earth element at a low concentration, i.e., by constructing the amplifier using a rare earth element low density additives long optical fiber, the excitation light the becomes possible to propagate over long, while compensating the loss, or it is possible to propagate the optical signal while obtaining the gain, transmission can be expected while suppressing the nonlinear phenomenon of the optical fiber.

【0016】 [0016]

【発明の実施の形態】以下、本発明の実施の形態を添付図面に基づいて詳述する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, will be described in detail based on the embodiment of the present invention in the accompanying drawings.

【0017】図1は本発明の希土類元素添加光ファイバの一実施の形態を示す断面図である。 [0017] FIG. 1 is a cross-sectional view showing an embodiment of a rare-earth-element-doped optical fiber of the present invention.

【0018】この希土類元素添加光ファイバ(以下「光ファイバ」という。)10は、希土類元素が添加された中空状の複数のEr添加コア(以下「コア」という。) [0018] (hereinafter referred to as "optical fiber".) The rare earth element-doped optical fiber 10, a rare earth element is doped hollow plurality of Er-doped core (hereinafter referred to as "core".)
11と、コア11より屈折率が低くコア11の束を覆う略円形断面形状のクラッド12とで構成されたものである。 11, in which the refractive index than the core 11 is constituted by a substantially circular cross-sectional shape clad 12 which covers the bundle of lower core 11. すなわち、光ファイバ10は、低屈折率n cの略円形断面形状のクラッド12内の中央部に希土類元素(例えばEr)を添加した高屈折率n w (n w >n c )の7 That is, the optical fiber 10, the low refractive index n high refractive index doped with a rare earth element (e.g., Er) in the central portion of the cladding 12 of a substantially circular cross-sectional shape of c n w (n w> n c) 7
本の略円形断面形状のコア11を有し、各コア11の中心に中空部13が形成されたものである。 It has a substantially circular cross-sectional shape of the core 11 of the present, in which the hollow portion 13 is formed at the center of each core 11.

【0019】クラッド12の外径は通常125μmであり、その材質はSiO 2 (若しくはSiO 2にFを添加したもの)であり、屈折率n cは1.44から1.46 The outer diameter of the cladding 12 is typically 125 [mu] m, the material is SiO 2 (or SiO 2 to which was added F), the refractive index n c is from 1.44 1.46
程度(波長633nmの値)である。 It is the degree (the value of the wavelength 633 nm). コア11の直径は、2μm〜4μmの範囲内でコア11の本数に応じて変えるのが好ましい。 The diameter of the core 11 is preferably changed according to the number of core 11 within the 2Myuemu~4myuemu. すなわち、コア11の直径は、コア11の本数が少ないときには大きくし、コア11の本数数が多いときには小さくするのが好ましい。 That is, the diameter of the core 11 is increased when the number of the core 11 is small, preferably small when the number the number of the core 11 is large. コア11 Core 11
の材質はSiO 2にGeO 2 、P 25 、F等の屈折率制御用ドーパントを添加したものであり、この場合のコア11とクラッド12との比屈折率差Δは0.3%〜2 The material GeO 2, P 2 O 5 to SiO 2, is obtained by adding the refractive index control beam dopant such as F, the relative refractive index difference between the core 11 and the cladding 12 in this case Δ 0.3% 2
%程度である。 It is about%. Er添加量は50ppm〜数千ppmの範囲が好ましい。 Er amount is preferably from 50ppm~ several thousand ppm. 各コア11はわずかな隙間d(0.数μm〜数μm)をもたせて配置されている。 Each core 11 is disposed remembering slight gap d (0. Several μm~ number [mu] m).

【0020】この光ファイバ10の各コア11内に信号光及び励起光をそれぞれ分配して伝搬させる。 The propagating and respectively distributes the signal light and the pumping light into the cores 11 of the optical fiber 10. 各コア1 Each core 1
1内の中空部13の内径は0.05μm〜2μmの範囲が好ましい。 The inner diameter of the hollow portion 13 in the 1 range of 0.05μm~2μm is preferred. 中空部13をコア11内に形成することにより、コア11と中空部13との比屈折率差を極めて大きくとることができる(比屈折率差Δ>数十)。 By forming the hollow portion 13 in the core 11, the core 11 and the relative refractive index difference between the hollow portion 13 can take a very large (relative refractive index difference delta> tens). この結果、信号光及び励起光は各コア11内に強く閉じ込められて伝搬するようになる。 As a result, the signal light and the pumping light is to propagate confined strongly in each core 11.

【0021】ここで、コア11の本数は図では7本であるが、これに限定されるものではなく、2本以上、数十本程度であってもよい。 [0021] Here, although the number of the core 11 is seven in the figure, is not limited to this, two or more, may be about several tens. しかし、製造の容易さや構造の対称性等を考慮すると、数本から十数本の範囲から選択するのが好ましい。 However, considering the ease and symmetry of the structure in manufacturing, preferably selected from the range of several dozen pieces of.

【0022】希土類元素としては、Er以外にNd、S [0022] Examples of the rare earth element, Nd other than Er, S
m、Tm、Yb、Ho、Ce等を少なくとも1種類含んだものを用いることができる。 m, can be used Tm, Yb, Ho, those containing at least one of Ce and the like. また、Erと、他の希土類元素、例えばYbとを含んだ構成とすることによって、より高利得の増幅用光ファイバを提供することができる。 Further, it is possible to provide the Er, other rare earth elements, for example, by a structure that includes a Yb, the amplification optical fiber of a higher gain.

【0023】図2は本発明の希土類元素添加光ファイバの他の実施の形態を示す断面図である。 [0023] FIG. 2 is a sectional view showing another embodiment of a rare earth element-doped optical fiber of the present invention. 尚、図1に示した部材と同様の部材には共通の符号を用いた。 Incidentally, using the same reference numerals are used for the same members as the members shown in FIG.

【0024】図1に示した希土類元素添加光ファイバとの相違点は、各Er添加コア間の隙間に中空部を形成した点である。 The difference from the rare-earth-element-doped optical fiber shown in FIG. 1 is that the formation of the hollow portion in the gap between the Er-doped core.

【0025】すなわち、この希土類元素添加光ファイバ20は、希土類元素が添加された中空状の複数のコア1 [0025] That is, the rare-earth-element-doped optical fiber 20, hollow plurality of cores doped with a rare earth element 1
1と、コア11より屈折率が低くコア11の束を覆う略円形断面形状のクラッド21と、コア11間の隙間に形成された中空部22とで構成されている。 1, a cladding 21 having a substantially circular cross-sectional shape that covers a bundle of core 11 has a refractive index lower than the core 11, and a hollow portion 22 formed in the gap between the core 11.

【0026】このような中空部22を形成することにより、信号光及び励起光はより一層各コア11内に強く閉じ込められて伝搬するようになる。 [0026] By forming such a hollow portion 22, the signal light and the pumping light will be propagated more strongly confined more in each core 11. 中空部22の構造は、三角断面形状、多角形断面形状、円形断面形状、楕円断面形状のいずれであってもよい。 Structure of the hollow portion 22, a triangular cross section, a polygonal cross-sectional shape, a circular cross-sectional shape may be either oval cross-sectional shape. これらの中空部2 These hollow portion 2
2は製造工程において容易に形成することができる。 2 can be easily formed in the manufacturing process.

【0027】以下、この希土類元素添加光ファイバの製造方法について説明する。 [0027] Hereinafter, a method for manufacturing the rare earth element-doped optical fiber.

【0028】それぞれのEr添加中空コア母材7本を中空のクラッド母材管内に挿入し、中空のクラッド母材管の外側から加熱して中空クラッド母材管中にそれぞれのEr添加コア中空母材を溶着させ、この溶着工程の後に、光ファイバへの線引き工程を施すと、図2に示すような断面形状の希土類元素添加光ファイバが得られる。 [0028] Insert the respective Er added this hollow core preform 7 to a hollow clad preform tube, hollow clad preform tube each Er-doped core in carrier into the hollow clad preform tube is heated from the outside of the Material is welded, after this welding step, when subjected to a drawing step of the optical fiber, the rare-earth-element-doped optical fiber of the cross-sectional shape as shown in FIG. 2 is obtained.

【0029】図3は本発明の希土類元素添加光ファイバの他の実施の形態を示す断面図である。 [0029] FIG. 3 is a sectional view showing another embodiment of a rare earth element-doped optical fiber of the present invention.

【0030】図1に示した希土類元素添加光ファイバとの相違点は、Er添加コアの外周にリング断面形状の中間層を形成した点である。 The difference from the rare-earth-element-doped optical fiber shown in FIG. 1 in that the formation of the intermediate layer of the ring cross-sectional shape on the outer periphery of the Er-doped core.

【0031】すなわち、本希土類元素添加光ファイバ3 [0031] That is, the present rare earth element-doped optical fiber 3
0は、希土類元素が添加された中空状の複数のコア11 0, hollow plurality of cores 11 doped with a rare earth element
と、コア11の束を覆いコア11及びクラッド31より屈折率の低いリング断面形状の中間層32と、中間層3 When, an intermediate layer 32 of the lower ring-sectional shape of the refractive index than the core 11 and the cladding 31 covers the bundle of the core 11, the intermediate layer 3
2を覆いコア11より屈折率が低い略円形断面形状のクラッド31とで構成されたものである。 Refractive index than the core 11 covers the 2 is one which is composed of a clad 31 of lower substantially circular cross-sectional shape.

【0032】中間層32の屈折率は、Fを添加することによってクラッド31の屈折率よりも低い値にすることができる。 The refractive index of the intermediate layer 32 may be a value lower than the refractive index of the clad 31 by the addition of F. この結果、信号光及び励起光はさらにより一層各コア11内に閉じ込められて伝搬するようになる。 As a result, the signal light and the pumping light is to propagate confined more in the core 11 than further.

【0033】図4は本発明の希土類元素添加光ファイバを用いた光ファイバ増幅器の一実施の形態を示すブロック図である。 [0033] FIG. 4 is a block diagram illustrating one embodiment of an optical fiber amplifier using a rare earth element doped optical fiber of the present invention.

【0034】この光ファイバ増幅器40は、二つの励起光源41、42を用い、図1に示した光ファイバ10 [0034] The optical fiber amplifier 40 uses two excitation light sources 41 and 42, optical fiber 10 shown in FIG. 1
(若しくは希土類元素添加光ファイバ20、希土類元素添加光ファイバ30)内に双方向から矢印43、44で示す励起光を入力する、いわゆる双方向励起の光増幅器である。 (Or rare-earth-element-doped optical fiber 20, a rare earth element doped optical fiber 30) to enter the pump light shown by arrows 43 and 44 from both directions in an optical amplifier of the so-called bidirectional pumping. 一方(図では左側)の励起光源41からの励起光43は励起光入力手段としてのWDM(Wavele On the other hand the excitation light 43 from the excitation light source 41 (the left side in the figure) is WDM as an excitation light input means (Wavelet
ngth Division Multiplexe ngth Division Multiplexe
r:波長分割多重)フィルタ(若しくは光合波器)45 r: wavelength division multiplexing) filter (or optical multiplexer) 45
を介して光ファイバ10内に入力され、他方(図では右側)の励起光源42からの励起光44はWDMフィルタ(若しくは光合波器)46を介して光ファイバ10内に入力されて反転分布状態を形成する。 Is input to the optical fiber 10 via, and the other population inversion excitation light 44 is input through the WDM filter (or optical multiplexer) 46 to the optical fiber 10 from the excitation light source 42 (in the figure right) to form. 信号光47は光アイソレータ48a、WDMフィルタ45を介して光ファイバ10内に入力され、WDMフィルタ46、光アイソレータ48bを経て矢印49方向に出力される。 Signal light 47 is an optical isolator 48a, is inputted to the optical fiber 10 via the WDM filter 45, the WDM filter 46, through the optical isolator 48b is output to the arrow 49 direction. 尚、励起光は、矢印43方向、あるいは矢印44方向のいずれか一方から入力される、いわゆる片方向励起でもよい。 Incidentally, the excitation light, arrow 43 direction or input from either the arrow 44 direction, it may be a so-called unidirectional excitation.
また、ラマン増幅器のように、励起光が波長の少しずつ異なった複数の波長多重光源からの光であってもよい。 Further, as the Raman amplifier, the excitation light may be light from a plurality of wavelength-multiplexed light source slightly different wavelengths.

【0035】本発明は上記実施の形態に限定されるものではなく、希土類元素添加ファイバレーザに適用してもよい。 The present invention is not limited to the above embodiments may be applied to rare-earth-doped fiber laser.

【0036】図5は本発明の希土類元素添加光ファイバを用いた希土類元素添加ファイバレーザの一実施の形態を示すブロック図である。 [0036] FIG. 5 is a block diagram showing an embodiment of a rare earth element doped fiber laser using the rare earth element-doped optical fiber of the present invention.

【0037】この希土類元素添加ファイバレーザ50 [0037] The rare-earth-doped fiber laser 50
は、光ファイバ10と、光ファイバ10の一端側(図では左側)に配置され励起光を発する励起光源51と、光ファイバ10の一端側に配置され励起光を通過させ光ファイバ10内で発生した誘導放出光を反射して光ファイバ10内に戻す第一のミラー52と、光ファイバ10の他端側(図では右側)に配置され誘導放出光を反射して光ファイバ10内に戻す第二のミラー53と、光ファイバ10の他端側に配置され特定の波長のレーザ光54を通過させるフィルタ55とで構成されており、特定の波長のレーザ光を出射することができる。 It includes an optical fiber 10, one end of the optical fiber 10 (in the figure on the left) and the excitation light source 51 that emits disposed to the excitation light, generated in the optical fiber 10. allowed disposed at one end of the optical fiber 10 is passed through the excitation light a first mirror 52 back to optical fiber 10 by reflecting the stimulated emission light, the other end of the optical fiber 10 (in the figure right) back into the optical fiber 10 to reflect the stimulated emission light is located a second mirror 53, a filter 55 which is disposed on the other end side is passed through the laser beam 54 of a specific wavelength of the optical fiber 10 is composed of, it is possible to emit laser light of a specific wavelength.

【0038】以上において、本希土類元素添加光ファイバ及びそれを用いた光デバイスは、 (1) 希土類元素を添加した複数のコアのそれぞれの中心部が中空になっているので、比屈折率差を極めて大きくとることができ、希土類元素を添加したコア領域内に信号光及び励起光を閉じ込めて効率よく伝搬させ、信号光を高利得に増幅させる希土類元素添加光ファイバを提供することができる。 [0038] In the above, optical device using doped optical fibers and it this rare earth element, the (1) Since the respective center portions of the plurality of cores doped with a rare earth element is in the hollow, the relative refractive index difference can take quite large, confines the signal light and the pumping light into the core region doped with a rare earth element is efficiently propagated, it is possible to provide a rare-earth element doped optical fiber for amplifying the signal light at a high gain. (2) 各希土類元素添加コアの隙間に中空部を形成することにより、希土類元素を添加した各コア領域内に信号光及び励起光をさらに強く閉込めて伝搬させることができる。 (2) By forming a hollow portion in the gap of the rare-earth-doped core, it can be propagated by confining stronger signal light and excitation light to the core region doped with a rare earth element. (3) 希土類元素を添加した複数のコアを取り囲むようにリング断面形状の低屈折率の中間層を設け、この中間層とコアとの隙間に中空部を形成することにより、さらにより一層の閉込め効果を得ることができる。 (3) an intermediate layer having a low refractive index of the ring cross-sectional shape so as to surround the plurality of cores doped with a rare earth element is provided, by forming the hollow portion in the gap between the intermediate layer and the core, yet even more closed it is possible to obtain the rice effect. (4) 信号光及び励起光を各希土類元素添加コア内に分配して伝搬、増幅させることができるので、大電力パワーの信号光を入力しても非線形効果が起こりにくい。 (4) the signal light and the propagation of the excitation light is distributed into each rare-earth-doped core, it is possible to amplify, nonlinear effect hardly occurs even when the input signal light of the high power power. (5) 本発明の希土類元素添加光ファイバを用いることにより、高利得の光増幅器、大電力の光増幅器、大電力の希土類元素添加ファイバレーザ等の光デバイスを実現することができる。 (5) By using the rare-earth-element-doped optical fiber of the present invention, it is possible to realize high gain in an optical amplifier, high power of the optical amplifier, the optical device of the rare earth element doped fiber laser having a high power. (6) 非線形効果をできるだけ抑圧するために、それぞれのコア内に添加する希土類元素の濃度を少なくし、励起光を長尺にわたって伝搬させることにより、光ファイバの伝搬損失を補償、あるいは利得を得つつ信号光を伝搬させる伝送路を実現することができる。 (6) In order to suppress as much as possible non-linear effects, the concentration of the rare earth element added to the respective cores reduced, by propagating the excitation light over a long, resulting compensate for propagation loss of the optical fiber, or the gain the while signal light can be realized a transmission path for propagating.

【0039】 [0039]

【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。 According to the above summary the present invention, exhibits excellent effects as follows.

【0040】信号光及び励起光の閉込め効率を高くした希土類元素添加光ファイバ及びそれを用いた光デバイスの提供を実現することができる。 [0040] it is possible to realize the provision of the signal light and the rare earth element-doped optical fiber was increased confinement efficiency of the pumping light and an optical device using the same.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の希土類元素添加光ファイバの一実施の形態を示す断面図である。 1 is a cross-sectional view showing one embodiment of a rare-earth-element-doped optical fiber of the present invention.

【図2】本発明の希土類元素添加光ファイバの他の実施の形態を示す断面図である。 2 is a sectional view showing another embodiment of a rare earth element-doped optical fiber of the present invention.

【図3】本発明の希土類元素添加光ファイバの他の実施の形態を示す断面図である。 3 is a cross-sectional view showing another embodiment of a rare earth element-doped optical fiber of the present invention.

【図4】本発明の希土類元素添加光ファイバを用いた光ファイバ増幅器の一実施の形態を示すブロック図である。 4 is a block diagram illustrating one embodiment of an optical fiber amplifier using a rare earth element doped optical fiber of the present invention.

【図5】本発明の希土類元素添加光ファイバを用いた希土類元素添加ファイバレーザの一実施の形態を示すブロック図である。 5 is a block diagram showing an embodiment of a rare earth element doped fiber laser using the rare earth element-doped optical fiber of the present invention.

【図6】本発明者が先に提案した希土類元素添加光ファイバの断面図である。 [6] The present inventor is a cross-sectional view of a rare earth element-doped optical fiber previously proposed.

【図7】本発明者が先に提案した他の希土類元素添加光ファイバの断面図である。 [7] The present inventor is a cross-sectional view of another rare-earth element doped optical fiber previously proposed.

【符号の説明】 DESCRIPTION OF SYMBOLS

10 希土類元素添加光ファイバ(光ファイバ) 11 希土類元素添加コア(コア) 12 クラッド 13 中空部 10 rare-earth-element-doped optical fiber (optical fiber) 11 rare earth element doped core (core) 12 cladding 13 hollow portion

フロントページの続き (51)Int.Cl. 7識別記号 FI テーマコート゛(参考) H01S 3/17 H01S 3/17 Of the front page Continued (51) Int.Cl. 7 identification mark FI theme Court Bu (Reference) H01S 3/17 H01S 3/17

Claims (6)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 希土類元素が添加された中空状の複数のコアと、該コアより屈折率が低く上記コアの束を覆う略円形断面形状のクラッドとを備えたことを特徴とする希土類元素添加光ファイバ。 And 1. A plurality of hollow doped with a rare earth element core, rare earth elements, characterized in that the refractive index than the core has a substantially circular cross-sectional shape clad covering the bundle of the core low added optical fiber.
  2. 【請求項2】 上記コア間の隙間に中空部が形成されている請求項1に記載の希土類元素添加光ファイバ。 2. A rare-earth-doped optical fiber according to claim 1, the hollow portion in the gap between the core is formed.
  3. 【請求項3】 上記コアの束を上記コア及び上記クラッドより屈折率の低いリング断面形状の中間層で覆った請求項1または2に記載の希土類元素添加光ファイバ。 3. A rare-earth-element-doped optical fiber according to the bundle of the core to claim 1 or 2 covered with an intermediate layer of lower ring-sectional shape of the refractive index than the core and the cladding.
  4. 【請求項4】 上記希土類元素としてEr、Nd、S Wherein Er as the rare earth element, Nd, S
    m、Tm、Yb、Ho、Ce等を少なくとも1種類含んだものを用いた請求項1から3のいずれかに記載の希土類元素添加光ファイバ。 m, Tm, Yb, Ho, rare-earth-element-doped optical fiber according to any one of claims 1-3 with those containing at least one of Ce and the like.
  5. 【請求項5】 希土類元素が添加され信号光が伝搬する中空状の複数のコアを、該コアより屈折率が低く略円形断面形状のクラッドで覆った希土類元素添加光ファイバと、励起光を発生する少なくとも一つの励起光源と、上記信号光を増幅すべく上記励起光源からの励起光を上記希土類元素添加光ファイバに入力する励起光入力手段とを備えたことを特徴とする光ファイバ増幅器。 5. A hollow plurality of cores signal light rare earth element is added to propagate, and the rare earth element doped optical fiber refractive index than the core is covered with cladding of substantially circular cross-sectional shape reduced, generates excitation light at least one excitation light source, an optical fiber amplifier, characterized in that the excitation light from said excitation light source so as to amplify the signal light and a pump light input means for inputting to the rare earth doped optical fiber to be.
  6. 【請求項6】 希土類元素が添加された中空状の複数のコアを、該コアより屈折率が低く略円形断面形状のクラッドで覆った希土類元素添加光ファイバと、該希土類元素添加光ファイバの一端側に配置され励起光を発する励起光源と、上記希土類元素添加光ファイバの一端側に配置され上記励起光を通過させ上記希土類元素添加光ファイバ内で発生した誘導放出光を反射して上記希土類元素添加光ファイバ内に戻す第一のミラーと、上記希土類元素添加光ファイバの他端側に配置され上記誘導放出光を反射して上記希土類元素添加光ファイバ内に戻す第二のミラーと、上記希土類元素添加光ファイバの他端側に配置され特定の波長のレーザ光を通過させるフィルタとを備えたことを特徴とする希土類元素添加ファイバレーザ。 6. A plurality of cores of hollow doped with a rare earth element, a rare earth doped optical fiber covered refractive index than the core is in clad substantially circular cross-sectional shape low, one end of the rare-earth-element-doped optical fiber an excitation light source arranged on the side emits excitation light, the rare earth element doped optical the rare earth element to reflect the stimulated emission light is disposed on one end side is passed through the excitation light generated in the above rare-earth-element-doped optical fiber of the fiber a first mirror back into the doped optical fiber, a second mirror back in the rare earth doped optical fiber to reflect disposed above stimulated emission light to the other end of the rare earth element doped optical fiber, the rare earth rare-earth-doped fiber laser is characterized in that a filter which is disposed on the other end of the doped optical fiber is passed through a laser beam of a specific wavelength.
JP2000380487A 2000-12-14 2000-12-14 Rare-earth-element-doped optical fiber and an optical device using the same Expired - Fee Related JP4134511B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000380487A JP4134511B2 (en) 2000-12-14 2000-12-14 Rare-earth-element-doped optical fiber and an optical device using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000380487A JP4134511B2 (en) 2000-12-14 2000-12-14 Rare-earth-element-doped optical fiber and an optical device using the same

Publications (2)

Publication Number Publication Date
JP2002185063A true JP2002185063A (en) 2002-06-28
JP4134511B2 JP4134511B2 (en) 2008-08-20

Family

ID=18848662

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000380487A Expired - Fee Related JP4134511B2 (en) 2000-12-14 2000-12-14 Rare-earth-element-doped optical fiber and an optical device using the same

Country Status (1)

Country Link
JP (1) JP4134511B2 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006128384A (en) * 2004-10-28 2006-05-18 Hitachi Cable Ltd Fiber laser, optical fiber therefor, and laser oscillation method
JP2007335435A (en) * 2006-06-12 2007-12-27 Mitsubishi Cable Ind Ltd Optical fiber
JP2008225454A (en) * 2007-02-13 2008-09-25 Olympus Corp Laser microscope
GB2467342A (en) * 2009-01-30 2010-08-04 Peter Leaback Fibre suitable for reflecting solar light.
WO2013129234A1 (en) * 2012-02-29 2013-09-06 住友電気工業株式会社 Multicore optical fiber, multicore optical fiber cable, and multicore optical fiber transmission system
JP2014067053A (en) * 2004-01-16 2014-04-17 Imra America Inc Large core holey fiber
JP2015198177A (en) * 2014-04-01 2015-11-09 日本電信電話株式会社 fiber and fiber amplifier
US9281650B2 (en) 2005-05-20 2016-03-08 Imra America, Inc. Single mode propagation in fibers and rods with large leakage channels
US9632243B2 (en) 2007-09-26 2017-04-25 Imra America, Inc. Glass large-core optical fibers

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014067053A (en) * 2004-01-16 2014-04-17 Imra America Inc Large core holey fiber
US10197727B2 (en) 2004-01-16 2019-02-05 Imra America, Inc. Large core holey fibers
US9645309B2 (en) 2004-01-16 2017-05-09 Imra America, Inc. Large core holey fibers
US7792161B2 (en) 2004-10-28 2010-09-07 Hitachi Cable, Ltd. Optical fiber for fiber laser, fiber laser, and laser oscillation method
JP4561314B2 (en) * 2004-10-28 2010-10-13 日立電線株式会社 An optical fiber for fiber laser, fiber laser and laser oscillation method
JP2006128384A (en) * 2004-10-28 2006-05-18 Hitachi Cable Ltd Fiber laser, optical fiber therefor, and laser oscillation method
US9281650B2 (en) 2005-05-20 2016-03-08 Imra America, Inc. Single mode propagation in fibers and rods with large leakage channels
US9664849B2 (en) 2005-05-20 2017-05-30 Imra America, Inc. Single mode propagation in fibers and rods with large leakage channels
US10067289B2 (en) 2005-05-20 2018-09-04 Imra America, Inc. Single mode propagation in fibers and rods with large leakage channels
JP2007335435A (en) * 2006-06-12 2007-12-27 Mitsubishi Cable Ind Ltd Optical fiber
JP2008225454A (en) * 2007-02-13 2008-09-25 Olympus Corp Laser microscope
US9632243B2 (en) 2007-09-26 2017-04-25 Imra America, Inc. Glass large-core optical fibers
US10353144B2 (en) 2007-09-26 2019-07-16 Imra America, Inc. Glass large-core optical fibers
GB2467342A (en) * 2009-01-30 2010-08-04 Peter Leaback Fibre suitable for reflecting solar light.
US9164228B2 (en) 2012-02-29 2015-10-20 Sumitomo Electric Industries, Ltd. Multi-core optical fiber, multi-core optical fiber cable, and multi-core optical fiber transmission system
JPWO2013129234A1 (en) * 2012-02-29 2015-07-30 住友電気工業株式会社 Multi-core optical fiber, multi-core optical fiber cable, and multi-core optical fiber transmission system
CN104145198A (en) * 2012-02-29 2014-11-12 住友电气工业株式会社 Multicore optical fiber, multicore optical fiber cable, and multicore optical fiber transmission system
CN104145198B (en) * 2012-02-29 2018-06-15 住友电气工业株式会社 Multi-core fiber, the multicore optical fiber cable and the multi-core optical fiber transmission system
WO2013129234A1 (en) * 2012-02-29 2013-09-06 住友電気工業株式会社 Multicore optical fiber, multicore optical fiber cable, and multicore optical fiber transmission system
JP2015198177A (en) * 2014-04-01 2015-11-09 日本電信電話株式会社 fiber and fiber amplifier

Also Published As

Publication number Publication date
JP4134511B2 (en) 2008-08-20

Similar Documents

Publication Publication Date Title
JP2708278B2 (en) Erbium - doped fiber amplifier
EP1175714B1 (en) Method of producing an amplifying optical fibre device
US6288835B1 (en) Optical amplifiers and light source
EP0743722B1 (en) High-power pumping of three-level optical fiber laser amplifier
JP3291578B2 (en) Fiber amplifier
US6411323B1 (en) High power marking system achieved through power scaling via multiplexing
KR100509720B1 (en) Single mode optical fibre
EP0789433B1 (en) Counter-pumped optical fiber raman amplifier and its application in optical fiber communication system
US5742722A (en) Rare earth element-doped multiple-core optical fiber and optical systems using the samefield of the invention
US20020094159A1 (en) Optical fiber amplifiers and lasers and optical pumping devices therefor and methods of fabricating same
US20020172485A1 (en) Optical wavelength filtering apparatus with depressed-index claddings
US6801550B1 (en) Multiple emitter side pumping method and apparatus for fiber lasers
JP2640445B2 (en) Light amplifier
JP3250206B2 (en) Optical fiber amplifier
EP1124295A2 (en) Raman fiber laser
CN101266379B (en) High power optical apparatus employing large-mode-area, multimode, gain-producing optical fibers
US20040036955A1 (en) Double-clad fiber lasers and amplifiers having long-period fiber gratings
EP1128504A2 (en) Optical amplifier
US8428409B2 (en) Filter fiber for use in Raman lasing applications and techniques for manufacturing same
US20040218257A1 (en) Evanescent-field optical amplifiers and lasers
US5768012A (en) Apparatus and method for the high-power pumping of fiber optic amplifiers
EP0938172A2 (en) Article comprising an improved cascaded optical fiber raman device
US6751241B2 (en) Multimode fiber laser gratings
EP0588557A1 (en) Balanced optical amplifier
EP0651479A1 (en) Apparatus comprising an optical fiber laser or amplifier

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060317

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20080417

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080507

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20080520

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110613

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120613

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120613

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130613

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140613

Year of fee payment: 6

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

LAPS Cancellation because of no payment of annual fees