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1. 发明申请

WO0241050A9 A MICRO-STRUCTURED OPTICAL FIBRE 审中-公开
标题翻译：微结构光纤
公开(公告)号：WO0241050A9
公开(公告)日：2004-05-13
申请号：PCT/DK0100774
申请日：2001-11-20
申请人： CRYSTAL FIBRE AS , LIBORI STIG EIGIL BARKOU , BROENG JES , BJARKLEV ANDERS OVERGAARD , RASMUSSEN CHRISTIAN , KNUDSEN ERIK
发明人： LIBORI STIG EIGIL BARKOU , BROENG JES , BJARKLEV ANDERS OVERGAARD , RASMUSSEN CHRISTIAN , KNUDSEN ERIK
IPC分类号： C03B37/012 , C03B37/027 , G02B6/02 , G02B6/20 , G02B6/18 , G02B6/22
CPC分类号： C03B37/0279 , C03B37/0122 , C03B37/02781 , C03B2203/14 , C03B2203/16 , C03B2203/42 , C03B2205/08 , C03B2205/10 , G02B6/023 , G02B6/02328 , G02B6/02347 , G02B6/02357 , G02B6/02361 , G02B6/02385
摘要： A microstructured fibre having a cladding comprising a number of elongated features that are arranged to provide concentric circular or polygonial regions surrounding the fibre core. The cladding comprises a plurality of concentric cladding regions, at least some of which comprising cladding features. Cladding regions comprising cladding features of a relatively low index type are arranged alternatingly with cladding regions of a relatively high index type. The cladding features are arranged in a non-periodic manner when viewed in a cross section of the fibre. The cladding enables waveguidance by photonic bandgap effects in the fibre core. An optical fibre of this type may be used for light guidance in hollow core fibres for high power transmission. The special cladding structure may also provide strong positive or negative dispersion of light guided through the fibre - making the fibre useful for telecommunication applications.
摘要翻译：一种微结构纤维，其具有包括多个细长特征的包层，所述细长特征被布置成提供围绕纤维芯的同心圆形或多边形区域。包层包括多个同心包层区域，其中至少一些包括包层特征。包含相对较低折射率类型的包层特征的包覆区域与相对高折射率类型的包层区域交替布置。当在纤维的横截面中观察时，包层特征以非周期性方式布置。该包层通过光纤芯中的光子带隙效应使波导成为可能。这种光纤可以用于中空芯纤维中用于高功率传输的光引导。特殊的包层结构还可以提供通过光纤引导的光的强烈的正或负色散，使得光纤可用于电信应用。

2. 发明申请

WO2003019257A1 OPTICAL FIBRE WITH HIGH NUMERICAL APERTURE, METHOD OF ITS PRODUCTION, AND USE THEREOF 审中-公开
标题翻译：具有高数值孔径的光纤，其生产方法及其用途
公开(公告)号：WO2003019257A1
公开(公告)日：2003-03-06
申请号：PCT/DK2002/000568
申请日：2002-08-30
申请人： CRYSTAL FIBRE A/S , BROENG, Jes , BJARKLEV, Anders , LIBORI, Stig, Eigil, Barkou , FOLKENBERG, Jacob, Riis , VIENNE, Guillaume
发明人： BROENG, Jes , BJARKLEV, Anders , LIBORI, Stig, Eigil, Barkou , FOLKENBERG, Jacob, Riis , VIENNE, Guillaume
IPC分类号： G02B6/22
CPC分类号： G02B6/024 , G02B6/02328 , G02B6/02333 , G02B6/02338 , G02B6/02347 , G02B6/02352 , G02B6/02357 , G02B6/02361 , G02B6/02366 , G02B6/02371 , G02B6/02385
摘要： An article comprising an optical fibre, the fibre comprising at least one core surrounded by a first outer cladding region, the first outer cladding region being surrounded by a second outer cladding region, the first outer cladding region in the cross-section comprising a number of first outer cladding features having a lower refractive index than any material surrounding the first outer cladding features, wherein for a plurality of said first outer cladding features, the minimum distance between two nearest neighbouring first outer cladding features is smaller than 1.0 μm or smaller than an optical wavelength of light guided through the fibre when in use; a method of its production, and use thereof.
摘要翻译：一种包括光纤的物品，所述纤维包括被第一外包层区包围的至少一个核心，所述第一外包层区域被第二外包层区域包围，所述横截面中的所述第一外包层区域包括多个第一外包层特征具有比围绕第一外包层特征的任何材料低的折射率，其中对于多个所述第一外包层特征，两个最近邻近的第一外包层特征之间的最小距离小于1.0μm或小于使用时通过光纤引导的光的光波长; 其生产方法及其用途。

3. 发明申请

WO2002041050A3 A MICRO-STRUCTURED OPTICAL FIBRE 审中-公开
公开(公告)号：WO2002041050A3
公开(公告)日：2002-05-23
申请号：PCT/DK2001/000774
申请日：2001-11-20
申请人： CRYSTAL FIBRE A/S , LIBORI. Stig, Eigil, Barkou , BROENG, Jes , BJARKLEV, Anders, Overgaard , RASMUSSEN, Christian , KNUDSEN, Erik
发明人： LIBORI. Stig, Eigil, Barkou , BROENG, Jes , BJARKLEV, Anders, Overgaard , RASMUSSEN, Christian , KNUDSEN, Erik
IPC分类号： G02B6/20
摘要： A microstructured fibre having a cladding comprising a number of elongated features that are arranged to provide concentric circular or polygonial regions surrounding the fibre core. The cladding comprises a plurality of concentric cladding regions, at least some of which comprising cladding features. Cladding regions comprising cladding features of a relatively low index type are arranged alternatingly with cladding regions of a relatively high index type. The cladding features are arranged in a non-periodic manner when viewed in a cross section of the fibre. The cladding enables waveguidance by photonic bandgap effects in the fibre core. An optical fibre of this type may be used for light guidance in hollow core fibres for high power transmission. The special cladding structure may also provide strong positive or negative dispersion of light guided through the fibre - making the fibre useful for telecommunication applications.

4. 发明申请

WO2012136219A1 LIGHT DISTRIBUTION SYSTEM COMPRISING SPECTRAL CONVERSION MEANS 审中-公开
标题翻译：包含光谱转换装置的光分配系统
公开(公告)号：WO2012136219A1
公开(公告)日：2012-10-11
申请号：PCT/DK2012/050106
申请日：2012-04-03
申请人： DANMARKS TEKNISKE UNIVERSITET - DTU , PETERSEN, Paul Michael , BJARKLEV, Anders
发明人： PETERSEN, Paul Michael , BJARKLEV, Anders
IPC分类号： G02B6/00
CPC分类号： G02B6/0005 , G02B6/0003 , G02B6/02366
摘要： System (200, 300) for the distribution of white light, having a supply side (201, 301, 401) and a delivery side (202, 302, 402), the system being configured for guiding light with a multitude of visible wavelengths in a propagation direction P from the supply side to the distribution side, the system comprising a transport fibre (210, 310, 330, 410, 410a–d) and a spectral conversion fibre (220, 320, 420ad, 500, 600, 700), the transport fibre having a length extending from a first end (211, 311, 331) to a second end (212, 312, 332), and a spectral transmission characteristics,the transport fibre being operationally connected to the spectral conversion fibre having a length extending from an input end (221, 321)to an output end (222, 322), the spectral conversion fibre comprising a photoluminescent agent (511, 611, 711) for converting light of a first wavelength to light of a second, longer wavelength,a spectral conversion characteristics of the spectral conversion fibre being essentially determined by the spectral absorption and emission properties of the photoluminescent agent, the amount of photo- luminescent agent,and the distribution of the photoluminescent agent in the spectral conversion fibre, wherein the first and second wavelengths are selected according to the spectral transmission characteristics of the transport fibre such that transmission loss in the transport fibre at the first wavelength is less than at the second wavelength. According to further aspects, a method of providing a light distribution system and a method of correcting the spectral transmission characteristics of a light distribution system are disclosed.
摘要翻译：用于分配白光的系统（200,300），具有供应侧（201,301,401）和输送侧（202,302,402），所述系统被配置为用于引导具有多个可见波长的光传播方向P从供给侧到分布侧，该系统包括传输光纤（210,310,330,410,410a-d）和光谱转换光纤（220,320,420ad，500,600,700），所述传输光纤具有从第一端（211,311,331）延伸到第二端（212,312,332）的长度，以及光谱传输特性，所述传输光纤可操作地连接到具有该长度从输入端（221,321）延伸到输出端（222,322），所述光谱转换光纤包括用于将第一波长的光转换成第二波长的光的光致发光剂（511,611,711）波长，光谱转换光纤的光谱转换特性是必需的 y，其由光致发光剂的光谱吸收和发射性质，光致发光剂的量和光致变色光纤在光谱转换光纤中的分布决定，其中第一和第二波长根据光谱传输特性传输光纤使得第一波长的传输光纤中的传输损耗小于第二波长处的传输损耗。根据其它方面，公开了一种提供配光系统的方法和校正配光系统的光谱透射特性的方法。

5. 发明申请

WO2002101429A3 PHOTONIC BANDGAP FIBRE, AND USE THEREOF 审中-公开
公开(公告)号：WO2002101429A3
公开(公告)日：2002-12-19
申请号：PCT/DK2002/000390
申请日：2002-06-07
申请人： CRYSTAL FIBRE A/S , BROENG, Jes , LIBORI, Stig, Eigil, Barkou , BJARKLEV, Anders
发明人： BROENG, Jes , LIBORI, Stig, Eigil, Barkou , BJARKLEV, Anders
IPC分类号： G02B6/16
摘要： An object of the present invention is to provide new designs of microstructured optical fibres that may be fabricated without use of voids, such as fibres being realized using silica and silica doping techniques. The invention relates to a microstructured optical fibre that guides light in a core region (52), where the fibre has a cladding region that comprises a background material (51) and a number of cladding features or elements (50) that are elongated in the longitudinal direction of the fibre and have a higher refractive index than the cladding background material. The core region has a lower effective refractive index than the cladding, and the fibre may guide light in the core by photonic bandgap effects. The present invention provides designs of photonic bandgap fibres that may operate without the use of voids in the cladding, thereby simplifying fabrication of photonic bandgap fibres compared to prior art. The invention further provides photonic bandgap fibers with tuneable waveguiding properties, such as tuneable polarization. The invention further relates to a number of specific fibre designs that provide improvements with respect to dispersion characteristics, mode field diameters, propagation losses, polarization mode dispersion and other issues of relevance to optical communication systems.

6. 发明申请

WO2002084350A1 DUAL CORE PHOTONIC CRYSTAL FIBERS (PCF) WITH SPECIAL DISPERSION PROPERTIES 审中-公开
标题翻译：具有特殊分散性的双核光子晶体纤维（PCF）
公开(公告)号：WO2002084350A1
公开(公告)日：2002-10-24
申请号：PCT/DK2002/000245
申请日：2002-04-11
申请人： CRYSTAL FIBRE A/S , LIBORI, Stig, Eigil, Barkou , BROENG, Jes , BJARKLEV, Anders , MORTENSEN, Niels, Asger , JENSEN, Jacob, Riis
发明人： LIBORI, Stig, Eigil, Barkou , BROENG, Jes , BJARKLEV, Anders , MORTENSEN, Niels, Asger , JENSEN, Jacob, Riis
IPC分类号： G02B6/16
CPC分类号： G02B6/03644 , G02B6/02042 , G02B6/02261 , G02B6/0228 , G02B6/02333 , G02B6/02338 , G02B6/02347 , G02B6/02357 , G02B6/02361 , G02B6/02366 , G02B6/02371 , G02B6/0238 , G02B6/03627 , G02B6/03688 , G02B6/29377
摘要： An optical fibre for transmitting light, said optical fibre having an axial direction and a cross section perpendicular to said axial direction, said optical fibre comprising: (1) a first core region comprising a first core material having a refractive index N co,1 ; (2) a microstructured first cladding region surrounding the first core region, said first cladding region comprising a first cladding material and a plurality of spaced apart first cladding features or elements that are elongated in the fibre axial direction and disposed in the first cladding material, said first cladding material having a refractive index N cl,l and each said first cladding feature or element having a refractive index being lower than N cl,1 , whereby a resultant geometrical index N¿ge,cl, 1? of the first cladding region is lowered compared to N cl,1 ; (3) a second core region surrounding said first cladding region, said second core region comprising a second core material having a refractive index N co,2 , and (4) a second cladding region surrounding the second core region, said second cladding region comprising a second cladding material having a refractive index N cl,2 , wherein the first core material, the first cladding material and the first cladding features, the second core material, and the second cladding material are selected and arranged so that N co,1 > N ge,cl,1 , N co,2 > N ge,cl,l , and N co,2 > N cl,2 .
摘要翻译： 1.一种用于透射光的光纤，所述光纤具有轴向和垂直于所述轴向的横截面，所述光纤包括：（1）第一芯区，包括具有折射率Nco的第一芯材料; （2）围绕第一芯区域的微结构化第一包层区域，所述第一包层区域包括第一包层材料和多个间隔开的第一包层特征或在纤维轴向方向上延伸并设置在第一包层材料中的元件，所述第一包层材料具有折射率Ncl，l，并且每个所述第一包层特征或元件具有低于Ncl，1的折射率，由此与Ncl相比，第一包层区域的合成几何指数Nge，cl，1降低，1; （3）围绕所述第一包层区域的第二纤芯区域，所述第二纤芯区域包括具有折射率Nco的第二纤芯材料，以及（4）围绕所述第二纤芯区域的第二包覆区域，所述第二包覆区域包括具有折射率Ncl，2的第二包层材料，其中所述第一芯材料，所述第一包层材料和所述第一包层材料，所述第二芯材料和所述第二包层材料被选择和布置，使得Nco1> Nge，cl ，1，Nco，2> Nge，cl，l和Nco，2> Ncl，2。

7. 发明申请

WO0221074A3 OPTICAL AMPLIFICATION IN COHERENCE REFLECTOMETRY 审中-公开
标题翻译：相干反射光学中的光学放大
公开(公告)号：WO0221074A3
公开(公告)日：2004-04-15
申请号：PCT/DK0100573
申请日：2001-09-04
申请人： FORSKNINGSCT RISOE , ANDERSEN PETER E , BJARKLEV ANDERS , TYCHO ANDREAS
发明人： ANDERSEN PETER E , BJARKLEV ANDERS , TYCHO ANDREAS
IPC分类号： A61B5/00 , G01B9/02 , G01N21/47
CPC分类号： G01N21/4795 , A61B5/0066 , A61B5/0086 , G01B9/02091
摘要： The present invention relates to an apparatus and a method for optical coherence reflectometry, in particular for optical coherence tomography. The invention particularly relates to the route of the light field in the sample arm. The reflected light field in the sample arm is amplified before being received by a combining means, said combining means being capable of receiving the reflected light field from the sample arm as well as the second reflected light field from the reference arm. Thereby, it is possible to direct substantially all light energy in the sample arm to the combining means, and to obtain fully the utilisation of the amplification of the reflected light field since preferably only the reflected light field is amplified by the optical amplifier. This leads to an improved signal-to-noise ratio (SNR) whereby an increase of the maximal penetration depth is obtained. Thereby, the apparatus is useful for obtaining optical biopsies of transparent as well as non-transparent tissues as well as new technical fields wherein the increased SNR allows the use of the present apparatus.
摘要翻译：本发明涉及一种用于光学相干反射测量的装置和方法，特别是用于光学相干层析成像。本发明特别涉及样品臂中的光场的路线。采样臂中的反射光场在被组合装置接收之前被放大，所述组合装置能够接收来自采样臂的反射光场以及来自参考臂的第二反射光场。因此，可以将采样臂中的基本上所有的光能引导到组合装置，并且完全可以利用反射光场的放大，因为优选地只有反射光场被光放大器放大。这导致改善的信噪比（SNR），从而获得最大穿透深度的增加。因此，该装置对于获得透明和非透明组织的光学活组织检查以及新的技术领域是有用的，其中增加的SNR允许使用本装置。

8. 发明申请

WO0241050A2 A MICRO-STRUCTURED OPTICAL FIBRE 审中-公开
标题翻译：微结构光纤
公开(公告)号：WO0241050A2
公开(公告)日：2002-05-23
申请号：PCT/DK0100774
申请日：2001-11-20
申请人： CRYSTAL FIBRE AS , LIBORI STIG EIGIL BARKOU , BROENG JES , BJARKLEV ANDERS OVERGAARD , RASMUSSEN CHRISTIAN , KNUDSEN ERIK
发明人： LIBORI STIG EIGIL BARKOU , BROENG JES , BJARKLEV ANDERS OVERGAARD , RASMUSSEN CHRISTIAN , KNUDSEN ERIK
IPC分类号： C03B37/012 , C03B37/027 , G02B6/02 , G02B6/00
CPC分类号： C03B37/0279 , C03B37/0122 , C03B37/02781 , C03B2203/14 , C03B2203/16 , C03B2203/42 , C03B2205/08 , C03B2205/10 , G02B6/023 , G02B6/02328 , G02B6/02347 , G02B6/02357 , G02B6/02361 , G02B6/02385
摘要： A microstructured fibre having a cladding comprising a number of elongated features that are arranged to provide concentric circular or polygonial regions surrounding the fibre core. The cladding comprises a plurality of concentric cladding regions, at least some of which comprising cladding features. Cladding regions comprising cladding features of a relatively low index type are arranged alternatingly with cladding regions of a relatively high index type. The cladding features are arranged in a non-periodic manner when viewed in a cross section of the fibre. The cladding enables waveguidance by photonic bandgap effects in the fibre core. An optical fibre of this type may be used for light guidance in hollow core fibres for high power transmission. The special cladding structure may also provide strong positive or negative dispersion of light guided through the fibre - making the fibre useful for telecommunication applications.
摘要翻译：一种具有包层的微结构纤维，其包括多个细长特征，其布置成提供围绕纤维芯的同心圆形或多边形区域。包层包括多个同心包层区域，其中至少一些包括包层特征。包含相对低折射率类型的包层特征的包覆区域与相对较高折射率类型的包层区域交替布置。当在纤维的横截面中观察时，包层特征以非周期性方式布置。该包层通过光纤芯中的光子带隙效应使波导成为可能。这种类型的光纤可以用于用于高功率传输的中空纤维中的光引导。特殊的包层结构还可以提供通过光纤引导的光的强正或负色散，使得光纤对于电信应用是有用的。

9. 发明申请

WO0212931A2 DISPERSION MANIPULATING FIBRE 审中-公开
标题翻译：分散操作纤维
公开(公告)号：WO0212931A2
公开(公告)日：2002-02-14
申请号：PCT/DK0100511
申请日：2001-07-20
申请人： CRYSTAL FIBRE AS , LIBORI STIG EIGIL BARKOU , BROENG JES , BJARKLEV ANDERS , SOENDERGAARD THOMAS , NIELSEN MARTIN DYBENDAL
发明人： LIBORI STIG EIGIL BARKOU , BROENG JES , BJARKLEV ANDERS , SOENDERGAARD THOMAS , NIELSEN MARTIN DYBENDAL
IPC分类号： G02B6/02 , G02B6/122 , G02B6/00
CPC分类号： G02B6/02323 , B82Y20/00 , G02B6/02233 , G02B6/02242 , G02B6/02333 , G02B6/02338 , G02B6/02347 , G02B6/02357 , G02B6/02361 , G02B6/03611 , G02B6/03627 , G02B6/03633 , G02B6/03688 , G02B6/1225
摘要： Micro-structured optical fibres are improved with respect to increasing the dispersion, both to large negative or large positive values, in a first fibre design in which the fibre has a micro-structured core region being surrounded by a micro-structured cladding region with cladding features being large compared to a predetermined wavelength of light, which can be guided through the fibre. Preferably, the effective index of refraction of the core region, Nco, is larger than the effective index of refraction of the cladding region Ncl, at the predetermined wavelength of light. It is further preferred that the refractive index of one or more of the core features is lower than the refractive index of the core material. Increased dispersion is also obtained by a second optical fibre design in which the fibre has two cladding regions, where the inner cladding region may be micro-structured with inner cladding features and having an effective refrafctive index that is larger than the effective refractive index of the outer cladding region at the operating wavelengths, i.e. the fibre has an inner cladding with a raised effective refractive index. For the second fibre design it is preferred that the outer cladding region is micro-structured with outer cladding features. There is further provided a third optical fibre design, which may be used for non-linear applications, and in which the use of a raised, inner cladding provides the flexibility to obtain fibres with very, small cores and near-zero dispersion over a broad wavelengths range at near-infrared wavelengths. In the third fibre design, the optical fibre has a core region surrounded by an inner cladding region with a number of inner cladding features disposed in an inner cladding material, while the inner cladding region is surrounded by an outer cladding region. In the third design the inner cladding features have a refractive index that differs from the refractive index of the inner cladding material, and the inner cladding region has an effective refractive index Ni that is larger than_the effective refractive index No of the outer cladding region at the operating wavelength. The core region of the third design may be a substantially solid core with an effective refractive index Nco being larger than Ni at the operating wavelength. For the third design, the outer cladding region may also comprise a number of outer cladding features disposed in an outer cladding material, with the outer cladding features having a refractive index that differs from the refractive index of the outer cladding material. For the third fibre design it is preferred that the effective refractive index difference between the core region and the inner cladding region is greater than about 5%.
摘要翻译：关于在第一光纤设计中增加分散度到大的负的或大的正值的微结构光纤被改进，其中光纤具有由具有包层的微结构的包层区域包围的微结构的核心区域特征与可以被引导通过光纤的预定波长的光相比是大的。优选地，核心区域Nco的折射的有效折射率大于在预定波长的光下包层区域Ncl的有效折射率。进一步优选的是，一个或多个芯部特征的折射率低于芯材料的折射率。通过第二光纤设计获得增加的色散，其中光纤具有两个包层区域，其中内包层区域可以是具有内包层特征的微结构并且具有大于有效折射率的有效折射率外包层区域在工作波长，即纤维具有提高的有效折射率的内包层。对于第二光纤设计，优选的是，外包层区域是具有外包层特征的微结构。还提供了第三种光纤设计，其可以用于非线性应用，并且其中使用凸起的内包层提供灵活性以获得具有非常小的芯的纤维和在宽的波长范围在近红外波长。在第三光纤设计中，光纤具有由内包层区域包围的芯区域，内包层特征设置在内包层材料中，而内包层区域被外包层区域包围。在第三设计中，内包层特征具有与内包层材料的折射率不同的折射率，并且内包层区域具有有效折射率Ni，其大于所述外包层区域的有效折射率No 工作波长。第三设计的芯区域可以是在工作波长处具有大于Ni的有效折射率Nco的基本上实心的芯。对于第三设计，外包层区域还可以包括设置在外包层材料中的多个外包层特征，外包层特征具有不同于外包层材料的折射率的折射率。对于第三光纤设计，优选的是，芯区域和内包层区域之间的有效折射率差大于约5％。

10. 发明申请

WO1993002492A1 A METHOD OF AMPLIFYING AN OPTICAL SIGNAL, AN OPTICAL AMPLIFIER FOR PERFORMING THE METHOD, AND USE OF SUCH AN OPTICAL AMPLIFIER AS A SOURCE OF LIGHT 审中-公开
标题翻译：放大光信号的方法，用于执行该方法的光放大器以及作为光源的这种光放大器的使用
公开(公告)号：WO1993002492A1
公开(公告)日：1993-02-04
申请号：PCT/DK1992000228
申请日：1992-07-17
申请人： NKT RESEARCH CENTER A/S , LYCOM A/S , BJARKLEV, Anders, Overgaard , RASMUSSEN, Thomas, Peter
发明人： NKT RESEARCH CENTER A/S , LYCOM A/S
IPC分类号： H01S03/06
CPC分类号： H01S3/06708 , H01S3/0672
摘要： An optical amplifier for signal light. The amplifier amplifies signals at a certain signal wavelength and consists of an active optical waveguide (4) of simple wave type geometry at the signal wavelength, a pump laser (2) for obtaining inverted population between the energy levels involved and coupling devices for coupling pump light and signal light in the active optical waveguide (4). The active optical waveguide is doped with ions of transition metals or metals from the groups of Lanthanides or Actinides. This doping is in a cylinder shell-shaped area (13) around the axis of symmetry of the waveguide (4) so that the reduction in the optical power originating from amplified spontaneous emission is greater than the reduction in the optical power originating from amplified signal light.
摘要翻译：一个用于信号灯的光放大器。该放大器以一定的信号波长放大信号，并由信号波长的简单波形几何形状的有源光波导（4）组成，泵浦激光器（2）用于在所涉及的能量水平之间获得反向群体，耦合装置用于耦合泵光和信号光在有源光波导（4）中。有源光波导掺杂有来自镧系元素或锕系元素的过渡金属或金属的离子。这种掺杂在波导（4）的对称轴周围的圆筒形壳体区域（13）中，使得源自放大的自发发射的光功率的减小大于源自放大信号的光功率的减小光。

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