-
公开(公告)号：US06466364B1
公开(公告)日：2002-10-15
申请号：US10060868
申请日：2002-01-29
IPC分类号： H01S300
CPC分类号： H04B10/294 , G02F1/3519 , H01S3/06754 , H01S3/1302 , H01S2301/04 , H01S2301/06 , H04B10/2935
摘要： An apparatus and a method provide gain flattening in communications systems wherein a large number of optical signals at different wavelengths must be amplified while maintaining signal power within an acceptable range. Because of differences in gain of typical optical amplifiers as a function of wavelength and input power, the signals at different wavelengths are not amplified by the same amounts. Thus, when amplified multiple times, certain signals tend to become severely attenuated to the point of being no longer useable. The present gain flattening apparatus and method cause signals having higher gain-power products to be attenuated by a greater amount in response to Kerr-induced phase shifting such that after multiple stages of amplification, all the signal powers converge toward a small range of acceptable output powers. The apparatus provides amplification, multiple times, of a series of signals with a plurality of wavelengths covering a very wide spectral range, while maintaining the power of all the signals within a small range. The spread of this signal power range is robust against changes in the signal power, against changes in the number of signals, and, to some degree, against changes in the amplifier's pump power. The apparatus design is also robust against manufacturing changes in the parameters of the apparatus' components. The apparatus and invention are preferably implemented as multiple nonlinear Sagnac amplifiers having erbium-doped fiber amplifiers positioned asymmetrically in an interferometer loop.
-
公开(公告)号：US6097486A
公开(公告)日：2000-08-01
申请号：US253446
申请日：1999-02-19
CPC分类号： G01D5/35383
摘要： A fiber optic acoustic sensor array is based upon a Sagnac interferometer rather than being based upon Mach-Zehnder interferometers as in known acoustic sensor arrays. The fiber optic acoustic sensor array is used to detect acoustic waves in water. By basing the sensor array on the Sagnac interferometer rather than on a Mach-Zehnder interferometer, the sensor array has a stable bias point, has reduced phase noise, has a larger dynamic range, and allows a broadband signal source to be used rather than requiring a more expensive narrowline laser. A large number of acoustic sensors can be multiplexed into the architecture of the Sagnac interferometer.
摘要翻译： 光纤声学传感器阵列基于Sagnac干涉仪，而不是像已知的声学传感器阵列中的基于马赫 - 曾德尔干涉仪。 光纤声学传感器阵列用于检测水中的声波。 通过将传感器阵列基于Sagnac干涉仪而不是Mach-Zehnder干涉仪，传感器阵列具有稳定的偏置点，具有降低的相位噪声，具有较大的动态范围，并且允许使用宽带信号源而不是要求 一个更昂贵的窄线激光。 大量的声传感器可以复用到Sagnac干涉仪的架构中。
-
公开(公告)号：US06377391B1
公开(公告)日：2002-04-23
申请号：US09537639
申请日：2000-03-29
IPC分类号： H01S300
CPC分类号： H04B10/294 , G02F1/3519 , H01S3/06754 , H01S3/1302 , H01S2301/04 , H01S2301/06 , H04B10/2935
摘要： An apparatus and a method provide gain flattening in communications systems wherein a large number of optical signals at different wavelengths must be amplified while maintaining signal power within an acceptable range. Because of differences in gain of typical optical amplifiers as a function of wavelength and input power, the signals at different wavelengths are not amplified by the same amounts. Thus, when amplified multiple times, certain signals tend to become severely attenuated to the point of being no longer useable. The present gain flattening apparatus and method cause signals having higher gain-power products to be attenuated by a greater amount in response to Kerr-induced phase shifting such that after multiple stages of amplification, all the signal powers converge toward a small range of acceptable output powers. The apparatus provides amplification, multiple times, of a series of signals with a plurality of wavelengths covering a very wide spectral range, while maintaining the power of all the signals within a small range. The spread of this signal power range is robust against changes in the signal power, against changes in the number of signals, and, to some degree, against changes in the amplifier's pump power. The apparatus design is also robust against manufacturing changes in the parameters of the apparatus' components. The apparatus and invention are preferably implemented as multiple nonlinear Sagnac amplifiers having erbium-doped fiber amplifiers positioned asymmetrically in an interferometer loop.
摘要翻译： 一种装置和方法在通信系统中提供增益平坦化，其中必须放大不同波长的大量光信号，同时将信号功率保持在可接受的范围内。 由于作为波长和输入功率的函数的典型光放大器的增益差异，不同波长的信号不会被放大相同的量。 因此，当多次放大时，某些信号倾向于变得严重衰减到不再可用的程度。 本增益平坦化装置和方法使得具有较高增益功率乘积的信号响应于克尔感应相移而被衰减更大的量，使得在多级放大之后，所有的信号功率向着可接受的输出的小范围收敛 权力。 该装置提供多个具有覆盖非常宽的光谱范围的多个波长的一系列信号的放大倍数，同时将所有信号的功率保持在小范围内。 该信号功率范围的扩展对于信号功率的变化，对于信号数量的变化以及在一定程度上对放大器的泵功率的变化是稳健的。 该设备设计对于设备组件的参数的制造变化也是鲁棒的。 该装置和发明优选地被实现为具有在干涉仪环路中不对称地布置的掺铒光纤放大器的多个非线性Sagnac放大器。
-
公开(公告)号：US09170599B2
公开(公告)日：2015-10-27
申请号：US13290982
申请日：2011-11-07
摘要： A method utilizes an optical image processing system. The method includes calculating a product of (i) a measured magnitude of a Fourier transform of a complex transmission function of an object or optical image and (ii) an estimated phase term of the Fourier transform of the complex transmission function. The method further includes calculating an inverse Fourier transform of the product, wherein the inverse Fourier transform is a spatial function. The method further includes calculating an estimated complex transmission function by applying at least one constraint to the inverse Fourier transform.
摘要翻译： 一种方法利用光学图像处理系统。 该方法包括：计算（i）物体或光学图像的复数传播函数的傅里叶变换的测量幅度和（ii）复数传递函数的傅立叶变换的估计相位项的乘积。 该方法还包括计算乘积的逆傅里叶变换，其中逆傅立叶变换是空间函数。 该方法还包括通过对傅里叶逆变换应用至少一个约束来计算估计的复传输函数。
-
公开(公告)号：US08249400B2
公开(公告)日：2012-08-21
申请号：US12587551
申请日：2009-10-08
申请人： Onur Kilic , Michel J. F. Digonnet , Gordon S. Kino , Olav Solgaard , Shrestha Basu Mallick , Onur Can Akkaya
发明人： Onur Kilic , Michel J. F. Digonnet , Gordon S. Kino , Olav Solgaard , Shrestha Basu Mallick , Onur Can Akkaya
IPC分类号： G02B6/00
摘要： An optical structure on an optical fiber and a method of fabrication is provided. The optical structure includes an end of an optical fiber and a layer formed on the end of the optical fiber. The layer comprises one or more first portions having a first optical pathlength in a direction perpendicular to the layer and one or more second portions having a second optical pathlength in the direction perpendicular to the layer, the second optical pathlength different from the first optical pathlength.
摘要翻译： 提供光纤上的光学结构和制造方法。 光学结构包括光纤的端部和形成在光纤端部上的层。 该层包括一个或多个在垂直于该层的方向上具有第一光程长度的第一部分，以及一个或多个第二部分在垂直于层的方向上具有第二光程长度，第二光程长度不同于第一光程长度。
-
公开(公告)号：US08233151B2
公开(公告)日：2012-07-31
申请号：US13230740
申请日：2011-09-12
IPC分类号： G01C19/72
CPC分类号： G01C19/722 , G02B6/02328 , G02B6/02361
摘要： An optical sensor includes at least a portion of an optical waveguide having a hollow core generally surrounded by a cladding. The cladding substantially confines a first optical signal and a second optical signal within the hollow core as the first optical signal and the second optical signal counterpropagate through the optical waveguide. Interference between the first optical signal and the second optical signal is responsive to perturbation of the at least a portion of the optical waveguide.
摘要翻译： 光学传感器包括光波导的至少一部分，其具有通常被包层包围的中空芯。 当第一光信号和第二光信号通过光波导反向传播时，包层基本上限制在中空芯内的第一光信号和第二光信号。 第一光信号和第二光信号之间的干扰响应于光波导的至少一部分的扰动。
-
7.发明授权Apparatus for measuring a frequency-domain optical coherence tomography power spectrum from a sample 有权用于从样本测量频域光学相干断层摄影功率谱的装置公开(公告)号：US08219350B2
公开(公告)日：2012-07-10
申请号：US13224555
申请日：2011-09-02
CPC分类号： A61B5/0066 , A61B5/0073 , A61B5/7257 , G01B9/02044 , G01B9/02083 , G01B9/02091 , G01N21/4795
摘要： An apparatus is provided for measuring a frequency-domain optical coherence tomography power spectrum from a sample. The apparatus includes a partially reflective element configured to be optically coupled to a light source and to the sample. A first portion of light from the light source is configured to be reflected by the partially reflective element. A second portion of light from the light source is configured to propagate through the partially reflective element, to impinge the sample, and to reflect from the sample. The apparatus is configured to receive the first and second portions of light and to measure the frequency-domain optical coherence tomography power spectrum in response to the first portion of light and the second portion of light.
摘要翻译： 提供了一种用于从样本测量频域光学相干断层摄影功率谱的装置。 该装置包括被配置为光耦合到光源和样品的部分反射元件。 来自光源的第一部分光被构造成被部分反射元件反射。 来自光源的第二部分光被配置成传播通过部分反射元件，以撞击样品并从样品反射。 该装置被配置为接收第一和第二部分光并且响应于第一部分光和第二部分光来测量频域光学相干断层摄影功率谱。
-
公开(公告)号：US08160406B2
公开(公告)日：2012-04-17
申请号：US12874104
申请日：2010-09-01
摘要： An acoustic sensor includes at least one structure including at least one photonic crystal slab and an optical fiber optically coupled to the at least one photonic crystal slab, and having at least one optical resonance with a resonance frequency and a resonance lineshape. The acoustic sensor further includes a housing mechanically coupled to the at least one structure. At least one of the resonance frequency and the resonance lineshape is responsive to acoustic waves incident upon the housing.
摘要翻译： 声学传感器包括至少一个结构，其包括至少一个光子晶体板和光学耦合到所述至少一个光子晶体板的光纤，并且具有至少一个具有谐振频率和谐振线形的光学谐振。 声学传感器还包括机械地联接到所述至少一个结构的壳体。 谐振频率和谐振线形形状中的至少一个响应于入射到壳体上的声波。
-
公开(公告)号：US07742665B2
公开(公告)日：2010-06-22
申请号：US11828277
申请日：2007-07-25
IPC分类号： G02B6/42
CPC分类号： G02B6/02328 , G02B6/02052 , G02B6/02304 , G02B6/02347 , G02B6/02376 , G02B6/2552
摘要： An optical filter and methods of filtering are provided. The optical filter includes a hollow-core fiber including a first portion and a second portion. The first portion includes a hollow core having a first diameter and a cladding having a second diameter. The second portion includes a hollow core having a third diameter smaller than the first diameter and a cladding having a fourth diameter smaller than the second diameter.
摘要翻译： 提供滤光器和滤光器。 滤光器包括中空纤维，其包括第一部分和第二部分。 第一部分包括具有第一直径的中空芯和具有第二直径的包层。 第二部分包括具有小于第一直径的第三直径的中空芯和具有小于第二直径的第四直径的包层。
-
公开(公告)号：US07643952B2
公开(公告)日：2010-01-05
申请号：US11396935
申请日：2006-04-03
摘要： A method processes an optical image. The method includes providing a measured magnitude of the Fourier transform of a two-dimensional complex transmission function. The method further includes providing an estimated phase term of the Fourier transform of the two-dimensional complex transmission function. The method further includes multiplying the measured magnitude and the estimated phase term to generate an estimated Fourier transform of the two-dimensional complex transmission function. The method further includes calculating an inverse Fourier transform of the estimated Fourier transform, wherein the inverse Fourier transform is a spatial function. The method further includes calculating an estimated two-dimensional complex transmission function by applying at least one constraint to the inverse Fourier transform.
摘要翻译： 一种处理光学图像的方法。 该方法包括提供二维复数传输函数的傅立叶变换的测量幅度。 该方法还包括提供二维复数传输函数的傅立叶变换的估计相位项。 该方法还包括将测量的幅度和估计的相位项相乘以产生二维复数传输函数的估计傅里叶变换。 该方法还包括计算傅立叶逆变换的傅立叶逆变换，其中逆傅里叶变换是空间函数。 该方法还包括通过对傅里叶逆变换应用至少一个约束来计算估计的二维复传输函数。
-
-
-
-
-
-
-
-
-
搜索结果
120 条记录 (耗时 0.036 秒)
