JPH10223961A - Optical amplifier - Google Patents

Optical amplifier

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Publication number
JPH10223961A
JPH10223961A JP2660597A JP2660597A JPH10223961A JP H10223961 A JPH10223961 A JP H10223961A JP 2660597 A JP2660597 A JP 2660597A JP 2660597 A JP2660597 A JP 2660597A JP H10223961 A JPH10223961 A JP H10223961A
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optical
waveguide
value
wavelength
dispersion
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JP2660597A
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Japanese (ja)
Inventor
Akira Fujisaki
Haruki Ogoshi
春喜 大越
晃 藤崎
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Furukawa Electric Co Ltd:The
古河電気工業株式会社
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Priority to JP2660597A priority Critical patent/JPH10223961A/en
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/02Optical fibre with cladding with or without a coating
    • G02B6/036Optical fibre with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03638Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
    • G02B6/0365Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - - +

Abstract

PROBLEM TO BE SOLVED: To provide an optical amplifier which actively utilizes the presence/ absence of four-wave mixing by controlling the value of chromatic dispersion, and can be used as a wide-band light source or waveform transforming element. SOLUTION: An optical amplifier is provided with a pumping light source 4, a multiplexer 5, and an optical waveguide 3 having a core section containing an added fluorescent material such as a rare-earth element, etc. in the section, and amplifies optical signals transmitted through the waveguide 3 by utilizing the inductive discharging action of the fluorescent material caused by stimulating light supplied to the waveguide 3 from the light source 4. In this case, the sum of the inclinations of the wavelength dispersion of the waveguide 3 which amplifies the optical signals when the signals pass through the waveguide 3 in the using wavelength band of the optical signals and all input-output optical waveguides 6 connected to the waveguide 3 to the wavelength becomes a flat value or a value which is extremely close to the flat value.

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、光の励起により光増幅作用を示す光導波路を用い、光通信等における光信号の線路損失、分配損失の補償あるいは受信感度の改善等に利用される光増幅装置に関するもので、特に幅広い自然放出光の蛍光帯域を使用し、広波長の光源としても利用される光増幅装置に関するものである。 The present invention relates to the use of a light waveguide of an optical amplification function by the excitation light, line loss of the optical signal in such optical communications, light is used for improvement of the compensation or the reception sensitivity distribution losses it relates amplifier, using the particular fluorescence band of wide spontaneous emission, to an optical amplifying device which is used as a light source of a broad wavelength.

【0002】 [0002]

【従来の技術】光ファイバの中に希土類元素等の蛍光物質を混入させて、これらのイオンの光励起時の光増幅作用を利用したファイバ型光増幅装置が提案され、その幾つかは実用化されている。 By mixing a fluorescent substance such as rare earth elements in of an optical fiber, these fiber-type optical amplifier using an optical amplification action during photoexcitation of ions have been proposed, some of which are commercialized ing. 希土類元素を添加した光ファイバを用いた光増幅装置として、従来はErを添加した石英系光ファイバやPrを添加したフッ化物系光ファイバがある。 As an optical amplifier using an optical fiber doped with a rare earth element, conventionally there is a fluoride-based optical fiber doped silica-based optical fiber and Pr were added Er. これらの光ファイバを用いることにより1550 By using these optical fibers 1550
nm帯や1300nm帯の光を直接増幅することができる。 Capable of amplifying light in nm band and 1300nm band directly. 上記の光ファイバを用いた光増幅装置は、光増幅を行うための励起光源、光信号と励起光を合波するための合波器および希土類元素等の蛍光物質が混入された光ファイバから構成されている。 The optical amplifier using the optical fiber of the structure from the excitation light source, an optical fiber which fluorescent material is mixed in the multiplexer, and a rare earth element or the like for multiplexing the optical signal and excitation light for performing optical amplification It is.

【0003】 [0003]

【発明が解決しようとする課題】一般に光増幅装置は、 The optical amplifying apparatus in general [0005] is,
広い帯域を持っているので現状の光伝送に対しては十分な帯域であると考えられる。 Because it has a wide band is considered to be a sufficient band for optical transmission of current. しかし、今後のより超高速な光伝送を考えた場合、その中に使用される信号伝送部分の光導波路の波長分散の絶対値が小さくないと超高速な伝送に対して適用不可能である。 However, it is not applicable to the case, ultrafast transmission to the absolute value of the chromatic dispersion of the optical waveguide of the signal transmission parts used therein is not less considering the more ultra high speed optical transmission in the future. 一方、光導波路の波長分散の値は4光波混合に代表される非線形現象に影響を与える。 On the other hand, the value of the chromatic dispersion of the optical waveguide influence the nonlinear phenomena represented by four-wave mixing. 特に光導波路の波長分散の絶対値が零、もしくは零に近い小さな値であるときに4光波混合が発生しやすくなる。 In particular four-wave mixing is likely to occur when the absolute value of the chromatic dispersion of the optical waveguide is zero or a small value close to zero. この4光波混合は、単純に光増幅を行う場合、じゃまになる厄介な現象となっている。 The four wave mixing, when performing simple optical amplification has become a troublesome phenomenon in which the way.

【0004】本発明は上記の課題に対応するもので、波長分散の値を制御することにより4光波混合の有無を積極的に利用し、広帯域な光源や波長変換素子として用いることのできる光増幅装置を提供することを目的とするものである。 [0004] The present invention corresponds to the above-described problems, an optical amplifier capable of actively using the presence or absence of four wave mixing by controlling the value of the chromatic dispersion, is used as a broadband light source and the wavelength converting element it is an object to provide a device.

【0005】 [0005]

【課題を解決するための手段】本発明は上記の課題を解決するために以下のような手段を有している。 The present invention SUMMARY OF] has the following means to solve the above problems.

【0006】本発明の請求項1の光増幅装置は、励起光源、合波器およびコア部に希土類元素等の蛍光物質が混入されている光導波路を備え、前記励起光源から前記光導波路に供給される励起光により生ずる前記蛍光物質の誘導放出作用により、前記光導波路内を伝送する光信号を増幅する光増幅装置において、前記光信号の使用波長帯域で前記光信号が通過する際に増幅作用を持つ光導波路および前記光導波路に接続される全ての入出力用光導波路の波長に対する波長分散の傾きの和が平坦もしくはきわめて平坦に近い値となっていることを特徴とする。 [0006] optical amplifying apparatus according to claim 1 of the present invention, the excitation light source, multiplexer and provided with an optical waveguide fluorescent substance such as rare earth elements are mixed in the core section, provided to the optical waveguide from the excitation light source the stimulated emission effects of the fluorescent substance caused by excitation light, the optical amplifier for amplifying an optical signal transmitting the optical waveguide, amplifying effect upon the optical signals pass in a used wavelength band of the optical signal wherein the sum of the inclination of the wavelength dispersion is flat or very near flat values ​​for wavelengths of all of the input and output optical waveguide connected to the optical waveguide and the optical waveguide with.

【0007】本発明の請求項2の光増幅装置は、使用波長帯域の波長分散の絶対値が零もしくは零に近い値となっていることを特徴とする。 [0007] optical amplifying apparatus according to claim 2 of the present invention is characterized in that the absolute value of the chromatic dispersion of the used wavelength band is a value close to zero or zero.

【0008】本発明の請求項3の光増幅装置は、使用波長帯域の波長分散の絶対値が4光波混合が発生しない所定の値となっていることを特徴とする。 [0008] optical amplifying apparatus according to claim 3 of the present invention is characterized in that has a predetermined value an absolute value of chromatic dispersion is four-wave mixing does not occur in the used wavelength band.

【0009】本発明の請求項1の光増幅装置によれば、 According to the optical amplifying apparatus according to claim 1 of the present invention,
光信号の使用波長帯域で増幅作用を持つ光導波路および光導波路に接続される全ての入出力用光導波路の波長分散の傾きの和がきわめて平坦に近い値となっているので、例えば使用波長帯域で光導波路の波長分散の絶対値が零もしくは零に近い値となると使用波長帯域全てで4 The sum of the slope of wavelength dispersion of all the input-output optical waveguide used is connected to the optical waveguide and the optical waveguide having an amplifying function in a wavelength band of the optical signal has a very flat close value, e.g., the used wavelength band 4 in the absolute value of the chromatic dispersion of the optical waveguide is a value close to zero or zero at the working wavelength band all
光波混合が発生し、この4光波混合を広帯域な光源や波長変換素子として利用できる。 Wave mixing occurs, take advantage of this four-wave mixing as a broadband light source and a wavelength conversion element. また、例えば使用波長帯域で光導波路の波長分散の絶対値が4光波混合が発生しない所定の値であると広帯域の光増幅装置となる。 Further, for example, when the absolute value of the chromatic dispersion of the optical waveguide in the used wavelength band is a predetermined value four-wave mixing does not occur with the broadband optical amplifier.

【0010】本発明の請求項2の光増幅装置によれば、 According to the optical amplifying apparatus according to claim 2 of the present invention,
使用波長帯域の波長分散の絶対値が零もしくは零に近い値となっているので、使用波長帯域全てで4光波混合が発生し、この4光波混合を広帯域な光源や波長変換素子として利用できる。 Since the absolute value of chromatic dispersion of the used wavelength band is a value close to zero or zero, four-wave mixing in all working wavelength band is generated, it can use this four-wave mixing as a broadband light source and a wavelength conversion element.

【0011】本発明の請求項3の光増幅装置によれば、 According to the optical amplifying apparatus according to claim 3 of the present invention,
使用波長帯域の波長分散の絶対値が4光波混合が発生しない所定の値となっているので、広帯域の光増幅装置となる。 Since the absolute value of chromatic dispersion of the used wavelength band is a predetermined value four-wave mixing does not occur, a broadband optical amplifier.

【0012】 [0012]

【発明の実施の形態】以下に本発明の光増幅装置の実施の形態を図1ないし図7を参照してより詳細に説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter an embodiment of the optical amplifier of the present invention with reference to FIGS described in more detail.

【0013】(実施の形態1)図1は、本発明の光増幅装置1を示す説明図である。 [0013] (Embodiment 1) FIG. 1 is an explanatory view showing an optical amplifying device 1 of the present invention. 光増幅装置1は、アイソレータ2A、2B、増幅光ファイバ3、励起光源4および励起光合波用の光合波器5を有している。 Optical amplifier 1, an isolator 2A, 2B, the amplification optical fiber 3 has an optical multiplexer 5 for multiplexing the excitation light source 4 and the excitation light. 増幅光ファイバ3は希土類元素等の蛍光物質が混入されている光ファイバであって、1500nm帯で波長分散が平坦かつ零分散となっている。 Amplifying optical fiber 3 is an optical fiber fluorescent substance such as a rare earth element is mixed, the chromatic dispersion at 1500nm band is flat and zero dispersion. アイソレータ2A、2B、励起光源4および励起光合波用の光合波器5のピグテイル光ファイバ6も1500nm帯で波長分散の波長依存性が平坦かつ零分散となっている。 Isolator 2A, 2B, the wavelength dependence of chromatic dispersion in pigtail optical fiber 6 also 1500nm band optical multiplexer 5 for multiplexing the excitation light source 4 and the excitation light is flat and zero dispersion. 4光波混合等の光ファイバ非線形現象の発生は、光ファイバコアの有効断面積に大きく依存し、これが小さい程非線形現象が大きくなるので、一般にはコア径の小さい光ファイバ程非線形現象が強くなる。 4 generation of optical fiber nonlinear phenomena wave mixing, etc. largely depends on the effective area of ​​the optical fiber core, since this smaller the nonlinear phenomenon increases, nonlinear phenomenon is intensified smaller optical fiber core diameters are typically. また、非線形屈折率n 2は屈折率が大きい程これも大きくなる。 Further, the nonlinear refractive index n 2 is also increased the larger the refractive index. 1500nm帯で波長分散が平坦かつ零分散とする具体的な光ファイバのプロファイルとしては、図2に示すようにW型屈折率プロファイルとして、各屈折率n 1 、n 2 、n 3およびそれぞれの半径α The profile of the specific optical fiber chromatic dispersion is flat and zero dispersion at 1500nm band, a W-shaped refractive index profile as shown in FIG. 2, the refractive index n 1, n 2, n 3 and respective radii α
1 、α 2 、α 3をコントロールすることによって得ることができる。 1, alpha 2, can be obtained by controlling the alpha 3. 図3は分散補償を考慮した増幅光ファイバの波長分散特性を示すもので、図3の黒丸は本実施の形態で用いた分散スロープも考慮して分散補償した増幅光ファイバ3の特性である。 Figure 3 shows the wavelength dispersion characteristic of the amplifying optical fiber in consideration of dispersion compensation, which is characteristic of the amplifying optical fiber 3 in which dispersion compensation dispersion slope be considered used in a black circle in this embodiment FIG.

【0014】この光増幅装置1の動作について以下に説明する。 [0014] In operation of the optical amplifier 1 below. 図1の左側から入射された光信号は、アイソレータ2Aを通過し、増幅光ファイバ3を通過する際に、 Optical signal incident from the left side of FIG. 1, when passing through the isolator 2A, passing through the amplification optical fiber 3,
励起光源4から増幅光ファイバ3に供給される励起光により生ずる蛍光物質の誘導放出作用で、増幅光ファイバ3内を伝送する光信号が増幅されて出力側のアイソレータ2Bを通過して出力される。 In stimulated emission effects of the fluorescent material caused by the pumping light supplied to the amplification optical fiber 3 from the pumping light source 4, an optical signal transmitted through the amplification optical fiber 3 is outputted through the isolator 2B of the amplified output side . この出力光は図3に示すように全ての入出力用光ファイバの波長分散の波長依存性の傾きの和がきわめて平坦に近い値となっていて、その波長分散の絶対値が零に近い値となっているので、使用波長帯域全てで4光波混合が発生し、この4光波混合を広帯域な光源や波長変換素子として利用できる。 The output light have become all very nearly flat value sum of the slope of the wavelength dependence of chromatic dispersion of the input-output optical fiber as shown in FIG. 3, the value and the absolute value of the chromatic dispersion close to zero since a, four-wave mixing in all working wavelength band is generated, it can use this four-wave mixing as a broadband light source and a wavelength conversion element.

【0015】(実施の形態2)図4は、本発明に係る他の実施の形態の光増幅装置11を示す説明図である。 [0015] Embodiment 2 FIG. 4 is an explanatory diagram showing an optical amplifier 11 of another embodiment according to the present invention. 光増幅装置11は実施の形態1の光増幅装置1と同一の構成となっていて、増幅光ファイバは希土類元素を添加した光ファイバであって、1500nm帯で波長分散が平坦かつ零分散となっている。 Optical amplifier 11 have the same configurations as the optical amplifier 1 of the first embodiment, the amplification optical fiber is an optical fiber doped with a rare earth element, is chromatic dispersion and flat and zero dispersion at 1500nm band ing. 2個のアイソレータ、励起光源および励起光合波用の光合波器のピグテイル光ファイバも1500nm帯で波長分散が平坦かつ零分散となっている。 Two isolators, pigtail optical fiber pump light source and the excitation light multiplexer for the optical multiplexer also chromatic dispersion in 1500nm band is flat and zero dispersion.

【0016】本実施の形態の光増幅装置11の特徴は実施の形態1の条件に加えて希土類元素を添加した増幅光ファイバおよび全てのピグテイル光ファイバが定偏波光ファイバ12となっていることである。 The characteristics of the optical amplifying apparatus 11 of this embodiment is that the amplifying optical fiber and all pigtail optical fiber doped with a rare earth element in addition to the conditions of the first embodiment is a polarization-maintaining optical fiber 12 is there. 偏波依存型の外部変調器13の前段に本実施の形態の光増幅装置11を配置すると全ての光ファイバが定偏波光ファイバ12となっていることで、より強い光信号14を外部変調器1 By all of the optical fiber by placing the optical amplifying apparatus 11 of this embodiment in front of the polarization dependent type external modulator 13 is a polarization-maintaining optical fiber 12, an external modulator a stronger optical signal 14 1
3に入力することができるので十分なS/N比を確保することができる。 It can be input to the 3 it is possible to ensure a sufficient S / N ratio.

【0017】(実施の形態3)図5は、本発明に係る他の実施の形態の光増幅装置21を示す説明図である。 [0017] (Embodiment 3) FIG. 5 is an explanatory diagram showing an optical amplifier 21 of another embodiment according to the present invention. 光増幅装置21は実施の形態1の光増幅装置1と同一の構成となっていて、増幅光ファイバ3は希土類元素を添加した光ファイバであって、1500nm帯で波長分散が平坦かつ零分散となっている。 Optical amplifier 21 have the same configurations as the optical amplifier 1 of the first embodiment, the amplification optical fiber 3 is an optical fiber doped with a rare earth element, the chromatic dispersion and flat, zero dispersion at 1500nm band going on. 2個のアイソレータ2 Two of the isolator 2
A、2B、励起光源4および励起光合波用の光合波器5 A, 2B, excitation light source 4 and the pump light combiner optical coupler 5
のピグテイル光ファイバ6も1500nm帯で波長分散が平坦かつ零分散となっている。 Pigtail optical fiber 6 also chromatic dispersion in 1500nm band is flat and zero dispersion. 本実施の形態の光増幅装置21の特徴はアイソレータ2Bの出力側に波長分散が平坦な分散シフト光ファイバ22を配置したもので、 Features of the optical amplifier 21 of the present embodiment in which the wavelength dispersion is placed flat dispersion shifted optical fiber 22 on the output side of the isolator 2B,
このことにより使用波長帯域全てで4光波混合が発生する。 This four-wave mixing in a used wavelength band all generated by.

【0018】また、本実施の形態の増幅光ファイバ3および全てのピグテイル光ファイバ6を実施の形態3の条件に加えて定偏波光ファイバとすることによって4光波混合の発生効率をよりあげることが可能となる。 Further, it the amplifying optical fiber 3 and all pigtail optical fiber 6 of the present embodiment in addition to the condition of the third embodiment by a constant polarization optical fiber increase more the generation efficiency of four-wave mixing It can become. その他の作用は実施の形態1と同様につき詳細な説明は省略する。 Other action details per same as in the first embodiment description is omitted.

【0019】(実施の形態4)実施の形態1と同様の光増幅装置1において、増幅光ファイバ3の希土類元素の添加濃度を薄くして、そのファイバ長を長くすることにより4光波混合の発生効率をあげることが可能となる。 [0019] In Embodiment 1 and the same optical amplifier 1 of the embodiment (Embodiment 4), the doping concentration of the rare earth element of the amplification optical fiber 3 is thinned, generation of four-wave mixing by increasing the fiber length it becomes possible to increase the efficiency.
また、本実施の形態の増幅光ファイバ3および全てのピグテイル光ファイバ6を実施の形態4の条件に加えて定偏波光ファイバとすることによって4光波混合の発生効率をさらにあげることが可能となる。 Further, it is possible to further increase the generation efficiency of four-wave mixing by addition a constant polarization optical fiber to the conditions of the fourth embodiment of the amplifying optical fiber 3 and all pigtail optical fiber 6 of the present embodiment . その他の作用は実施の形態1と同様につき詳細な説明は省略する。 Other action details per same as in the first embodiment description is omitted.

【0020】(実施の形態5)本実施の形態の光増幅装置は実施の形態1の光増幅装置1と同一の構成となっているもので、本実施の形態の光増幅装置の特徴は、増幅光ファイバ3が1500nm帯で波長分散値σAが図6 The optical amplifier of the present embodiment (Embodiment 5) in which has the same configurations as the optical amplifier 1 of the first embodiment, characteristics of the optical amplifying device of the present embodiment, wavelength dispersion value σA amplifying optical fiber 3 at 1500nm band 6
に示すように正の値で、かつ平坦とし、他の全てのピグテイル光ファイバ6の1500nm帯での波長分散の傾きの和の値σBが図6に示すように負の値で、かつ平坦とし、光増幅装置全体の波長分散値を零としたものである。 And a positive value, and flat as shown in, the value σB of the sum of the slope of wavelength dispersion in the 1500nm band for all other pigtail optical fiber 6 is in negative value as shown in FIG. 6, and a flat , in which the wavelength dispersion value of the entire optical amplifier is set to zero. 光増幅装置全体の波長分散値を零とすることによって、使用波長帯域全てで4光波混合が発生し、この4光波混合を広帯域な光源や波長変換素子として利用できる。 By zero wavelength dispersion value of the entire optical amplifier, four-wave mixing in all working wavelength band is generated, it can use this four-wave mixing as a broadband light source and a wavelength conversion element.

【0021】(実施の形態6)本実施の形態の光増幅装置は実施の形態1の光増幅装置1と同一の構成となっているもので、本実施の形態の光増幅装置の特徴は、増幅光ファイバ3が1500nm帯で波長分散値σA1 が図7に示すように正の値で、かつ平坦とし、他の全てのピグテイル光ファイバ6の1500nm帯での波長分散の傾きの和の値σB1 がきわめて平坦に近い値となっていて、その波長分散の絶対値が零に近い値となっていて光増幅装置全体の波長分散値を正の値で、かつ平坦としたものである。 The optical amplifier of the present embodiment (Embodiment 6) in which has the same configurations as the optical amplifier 1 of the first embodiment, characteristics of the optical amplifying device of the present embodiment, amplifying optical fiber 3 is wavelength dispersion value σA1 at 1500nm band is a positive value, as shown in FIG. 7, and a flat, the value of the sum of the slope of wavelength dispersion in the 1500nm band for all other pigtail optical fiber 6 Shigumabi1 There have been a very flat close values, in which the absolute value of chromatic dispersion is a wavelength dispersion value of the entire optical amplifier have a value close to zero at a positive value, and was flat. 光増幅装置全体の波長分散値を正の値で、 The wavelength dispersion value of the entire optical amplifier at a positive value,
かつ平坦とすることによって、使用波長帯域全てで4光波混合が発生することがない広帯域の光増幅装置となる。 And by a flat, the absence broadband optical amplifier that four-wave mixing in all operating wavelength band is generated. 4光波混合が発生することがない波長分散の和の値としては5ps/nm/km程度以上が必要である。 4 The value of the sum of the wavelength dispersion never wave mixing occurs is necessary than about 5ps / nm / km.

【0022】なお、上記の光増幅装置において、波長分散値を正の値で、かつ平坦とするために、増幅光ファイバ3が1500nm帯で波長分散値σA1 が正の値で、 [0022] In the above optical amplifier, a wavelength dispersion value in a positive value, and to the flat wavelength dispersion value σA1 is a positive value in the amplification optical fiber 3 1500 nm band,
かつ平坦とし、他の全てのピグテイル光ファイバ6の1 And a flat, 1 of all the other pigtail optical fiber 6
500nm帯での波長分散の傾きの和の値σB1 がきわめて平坦に近い値となっていて、その波長分散の絶対値が零に近い値としているが、その逆であってもよい。 Value σB1 of the sum of the inclination of the wavelength dispersion at 500nm band have become very flat close value, the absolute value of the chromatic dispersion is a value close to zero, or vice versa. また、その両方の波長分散値σA1 、σB1 が正の値で、 The wavelength dispersion value σA1 of both, Shigumabi1 is a positive value,
かつ平坦であってもよい。 And it may be flat. さらに、上記の光増幅装置において、光増幅装置全体の波長分散値を正の値で、かつ平坦としたが、光増幅装置全体の波長分散値を負の値で、かつ平坦としても使用波長帯域全てで4光波混合が発生することがない広帯域の光増幅装置となる。 Further, in the above optical amplifier, a wavelength dispersion value of the entire optical amplifier at a positive value, and was flat, the wavelength dispersion value of the entire optical amplifier at a negative value, and also used as a flat wavelength band FWM it is made that there is no broadband optical amplifier that occurs in all.

【0023】 [0023]

【発明の効果】以上述べたように、本発明のうち請求項1の光増幅装置によれば、光信号の使用波長帯域で増幅作用を持つ光導波路および光導波路に接続される全ての入出力用光導波路の波長分散の傾きの和がきわめて平坦に近い値となっているので、例えば使用波長帯域で光導波路の波長分散の絶対値が零もしくは零に近い値となると使用波長帯域全てで4光波混合が発生し、この4光波混合を広帯域な光源や波長変換素子として利用できる。 As described above, according to the present invention, according to the optical amplifying apparatus according to claim 1 of the present invention, all input and output being connected to the optical waveguide and the optical waveguide having an amplifying function in a used wavelength band of the optical signal the sum of the slope of wavelength dispersion of use optical waveguide has a very flat close value, e.g., in a used wavelength band as the absolute value of the chromatic dispersion of the optical waveguide is a value close to zero or zero at the working wavelength band all 4 wave mixing occurs, take advantage of this four-wave mixing as a broadband light source and a wavelength conversion element.
また、例えば使用波長帯域で光導波路の波長分散の絶対値が4光波混合が発生しない所定の値であると広帯域の光増幅装置となる。 Further, for example, when the absolute value of the chromatic dispersion of the optical waveguide in the used wavelength band is a predetermined value four-wave mixing does not occur with the broadband optical amplifier.

【0024】本発明の請求項2の光増幅装置によれば、 According to the optical amplifying apparatus according to claim 2 of the invention,
使用波長帯域の波長分散の絶対値が零もしくは零に近い値となっているので、使用波長帯域全てで4光波混合が発生し、この4光波混合を広帯域な光源や波長変換素子として利用できる。 Since the absolute value of chromatic dispersion of the used wavelength band is a value close to zero or zero, four-wave mixing in all working wavelength band is generated, it can use this four-wave mixing as a broadband light source and a wavelength conversion element.

【0025】本発明の請求項3の光増幅装置によれば、 According to the optical amplifying apparatus according to claim 3 of the invention, the
使用波長帯域の波長分散の絶対値が4光波混合が発生しない所定の値となっているので、広帯域の光増幅装置となる。 Since the absolute value of chromatic dispersion of the used wavelength band is a predetermined value four-wave mixing does not occur, a broadband optical amplifier.

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

【図1】本発明に係る光増幅装置の一実施の形態を示す説明図である。 Is an explanatory view showing an embodiment of an optical amplifier according to the invention; FIG.

【図2】本発明に係る光増幅装置に使用される光ファイバの屈折率プロファイルの一例を示す説明図である。 FIG. 2 is an explanatory diagram showing an example of a refractive index profile of the optical fiber used in the optical amplifying device of the present invention.

【図3】図1の光増幅装置に使用される増幅光ファイバおよび従来の増幅光ファイバの波長分散特性を示す説明図である。 3 is an explanatory diagram showing the wavelength dispersion characteristic of the amplifying optical fiber and the conventional amplifying optical fiber used in the optical amplifier of FIG.

【図4】本発明に係る光増幅装置の他の実施の形態を示す説明図である。 Is an explanatory view showing another embodiment of the optical amplifier according to the present invention; FIG.

【図5】本発明に係る光増幅装置のその他の実施の形態を示す説明図である。 5 is an explanatory diagram showing the other embodiments of the optical amplifying device of the present invention.

【図6】本発明に係る光増幅装置のその他の実施の形態の波長分散特性を示す説明図である。 6 is an explanatory diagram showing the wavelength dispersion characteristic of the other embodiment of the optical amplifier according to the present invention.

【図7】本発明に係る光増幅装置のさらにその他の実施の形態の波長分散特性を示す説明図である。 7 is an explanatory diagram showing the wavelength dispersion characteristic of still another embodiment of an optical amplifier according to the present invention.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 光増幅装置 2A、2B アイソレータ 3 増幅光ファイバ 4 励起光源 5 光合波器 6 ピグテイル光ファイバ 1 optical amplifier 2A, 2B isolator 3 amplifying optical fiber 4 the excitation light source 5 optical coupler 6 pigtail optical fiber

Claims (3)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 励起光源、合波器およびコア部に希土類元素等の蛍光物質が混入されている光導波路を備え、前記励起光源から前記光導波路に供給される励起光により生ずる前記蛍光物質の誘導放出作用により、前記光導波路内を伝送する光信号を増幅する光増幅装置において、 1. A pumping light source, comprising an optical waveguide fluorescent substance is mixed rare earth elements such as multiplexer and the core portion, from the excitation light source of the fluorescent substance caused by pumping light supplied to the optical waveguide the stimulated emission action, the optical amplifier for amplifying an optical signal transmitting the optical waveguide,
    前記光信号の使用波長帯域で前記光信号が通過する際に増幅作用を持つ光導波路および前記光導波路に接続される全ての入出力用光導波路の波長に対する波長分散の傾きの和が平坦もしくはきわめて平坦に近い値となっていることを特徴とする光増幅装置。 Amplifying action waveguide and the light sum of the slope of wavelength dispersion for the wavelength of all the input and output optical waveguide connected to the waveguide is flat or very with when passing the optical signal at the working wavelength band of the optical signal optical amplifying device, characterized in that it is flat near value.
  2. 【請求項2】 使用波長帯域の波長分散の絶対値が零もしくは零に近い値となっていることを特徴とする請求項1に記載の光増幅装置。 2. An optical amplifier according to claim 1, the absolute value of the chromatic dispersion of the used wavelength band is characterized in that has a value close to zero or zero.
  3. 【請求項3】 使用波長帯域の波長分散の絶対値が4光波混合が発生しない所定の値となっていることを特徴とする請求項1に記載の光増幅装置。 3. An optical amplifier according to claim 1, the absolute value of the chromatic dispersion of the used wavelength band, characterized in that the four-wave mixing has become a predetermined value that does not occur.
JP2660597A 1997-02-10 1997-02-10 Optical amplifier Pending JPH10223961A (en)

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US9375345B2 (en) 2006-09-26 2016-06-28 Zeltiq Aesthetics, Inc. Cooling device having a plurality of controllable cooling elements to provide a predetermined cooling profile
US8192474B2 (en) 2006-09-26 2012-06-05 Zeltiq Aesthetics, Inc. Tissue treatment methods
US9655770B2 (en) 2007-07-13 2017-05-23 Zeltiq Aesthetics, Inc. System for treating lipid-rich regions
US9408745B2 (en) 2007-08-21 2016-08-09 Zeltiq Aesthetics, Inc. Monitoring the cooling of subcutaneous lipid-rich cells, such as the cooling of adipose tissue
US9737434B2 (en) 2008-12-17 2017-08-22 Zeltiq Aestehtics, Inc. Systems and methods with interrupt/resume capabilities for treating subcutaneous lipid-rich cells
US9861520B2 (en) 2009-04-30 2018-01-09 Zeltiq Aesthetics, Inc. Device, system and method of removing heat from subcutaneous lipid-rich cells
US9844461B2 (en) 2010-01-25 2017-12-19 Zeltiq Aesthetics, Inc. Home-use applicators for non-invasively removing heat from subcutaneous lipid-rich cells via phase change coolants
US10092346B2 (en) 2010-07-20 2018-10-09 Zeltiq Aesthetics, Inc. Combined modality treatment systems, methods and apparatus for body contouring applications
US9545523B2 (en) 2013-03-14 2017-01-17 Zeltiq Aesthetics, Inc. Multi-modality treatment systems, methods and apparatus for altering subcutaneous lipid-rich tissue
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