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    • 3. 发明授权
    • Communication system using S-band Er-doped fiber amplifiers with depressed cladding
    • 使用具有凹陷包层的S波段掺铒光纤放大器的通信系统
    • US06903865B2
    • 2005-06-07
    • US10186561
    • 2002-06-28
    • Mark A. Arbore
    • Mark A. Arbore
    • H01S3/067H01S3/08H01S3/16H01S3/00
    • H01S3/06758H01S3/06712H01S3/06716H01S3/0672H01S3/06729H01S3/06766H01S3/0677H01S3/06775H01S3/08045H01S3/1608H01S3/1616H01S2301/02
    • An optical communication system such as a Wavelength-Division-Multiplexed (WDM) or Dense Wavelength-Division-Multiplexed (DWDM) communication system using Erbium doped fiber amplifiers (EDFAs) for amplifying signals in the S-band. The fiber amplifier has a core doped with Erbium and defined by a core cross-section and a refractive index n0. The fiber amplifier has a depressed cladding surrounding the core and a secondary cladding surrounding the depressed cladding. The depressed cladding has a depressed cladding cross-section and a refractive index n1, and the secondary cladding has a secondary cladding cross-section and a refractive index n2. The fiber amplifier has a pump source for pumping the Erbium to a level of high relative inversion D such that the Erbium exhibits positive gains in the S-band and high gains in a long wavelength band longer than the S-band, i.e., in the C- and L-Bands. The core cross-section, the depressed cladding cross-section and the refractive indices n0, n1, and n2 are selected to obtain losses at least comparable to the high gains in the long wavelength band and losses substantially smaller than the positive gains in the S-band. The optical communication system can employ the fiber amplifier as a pre-amplifier, a power-boosting amplifier or an in-line amplifier.
    • 一种光通信系统,例如使用掺铒光纤放大器(EDFA)的波分复用(WDM)或密集波分复用(DWDM)通信系统,用于放大S波段的信号。 光纤放大器具有掺杂有铒的芯并且由芯的横截面和折射率n O 0 <0>限定。 光纤放大器具有围绕芯的凹陷包层和围绕凹陷包层的次级包层。 凹陷的包层具有凹陷的包层横截面和折射率n 1,并且次级包层具有次级包层横截面和折射率n 2 2。 光纤放大器具有用于将铒掺杂到高相对反相D的水平的泵浦源,使得铒在S波段中呈现正增益,并且在比S波段长的波长带中具有高增益,即在 C-和L-带。 选择核心横截面,凹陷包层横截面和折射率n N 1,N 2和N 2,以获得 损失至少与长波段的高增益相当,并且损失明显小于S波段的正增益。 光通信系统可以使用光纤放大器作为前置放大器,功率放大放大器或串联放大器。
    • 4. 发明授权
    • Method for tuning nonlinear frequency mixing devices through degeneracy
    • 通过简并调谐非线性频率混合装置的方法
    • US06731660B2
    • 2004-05-04
    • US09863840
    • 2001-05-22
    • Mark A. ArboreLawrence E. Myers
    • Mark A. ArboreLawrence E. Myers
    • H01S310
    • G02F1/39H01S3/1083
    • A method for tuning nonlinear optical frequency converters including devices such as optical parametric amplifiers and optical parametric oscillators through degeneracy. The nonlinear conversion process is driven by a pump beam at an original pump wavelength and the tuning is accomplished by setting a passband around a first wavelength generated by the optical frequency converter and thereby generating a passband image around a second wavelength. Once the passband and passband image are within a critical range the original pump wavelength is adjusted to an adjusted pump wavelength and tuning continues by moving the passband which the adjusted pump wavelength is either held constant or further adjusted. In particular, the passband can now be moved through the resonant wavelength which corresponds to a point of degeneracy at the original pump wavelength. In some embodiments the critical range commences when the passband overlaps the passband image and the adjusted pump wavelength is selected such that the passband and the passband image do not overlap. Additional margins can be built into the critical range depending on the type of device used for setting the passband, the shape of the passband and the operating characteristics of the optical frequency converter.
    • 包括诸如光参量放大器和光参量振荡器之类的装置的非线性光频变换器的简化方法。 非线性转换过程由原始泵浦波长的泵浦光束驱动,并且通过设置由光学频率转换器产生的第一波长周围的通带并由此产生围绕第二波长的通带图像来实现调谐。 一旦通带和通带图像处于临界范围内,则原始泵浦波长被调整到调节的泵浦波长,并且通过移动经调整的泵浦波长保持恒定或进一步调节的通带来继续调谐。 特别地,通带现在可以移动通过谐振波长,该谐振波长对应于原始泵波长处的简并点。 在一些实施例中,当通带与通带图像重叠时,临界范围开始,并且选择调整的泵浦波长,使得通带和通带图像不重叠。 根据用于设置通带的设备类型,通带的形状和光频变频器的工作特性,可以将附加裕度内置到临界范围内。
    • 9. 发明授权
    • Aperiodic quasi-phasematching gratings for chirp adjustments and
frequency conversion of ultra-short pulses
    • 用于啁啾调节和超短脉冲频率转换的非周期准准同步光栅
    • US5815307A
    • 1998-09-29
    • US824032
    • 1997-03-26
    • Mark A. ArboreMartin M. Fejer
    • Mark A. ArboreMartin M. Fejer
    • G02F1/35G02F1/37H01S3/00G02B5/18
    • G02F1/3544H01S3/0057G02F1/37G02F2001/3548G02F2203/25G02F2203/26
    • An apparatus and method for simultaneous chirp adjustment and frequency conversion of an ultra-short input optical pulse A.sub.1 characterized by a center angular frequency .omega..sub.1,0 in a non-linear optical material with a quasi-phasematching (QPM) grating exhibiting an aperiodic pattern of regions D.sub.j constituting a grating. Passing the ultra-short input optical pulse A.sub.1 through the grating gives rise to a chirp-adjusted and frequency-converted output optical pulse A.sub.2. In the preferred embodiment the non-linear optical material is a Second Harmonic Generator (SHG) such that the output optical pulse A.sub.2 generated from the input optical pulse A.sub.1 is a chirp-adjusted second harmonic of said ultra-short input optical pulse A.sub.1. In the general case the method and apparatus use a transfer function D(.OMEGA.) derived from the equation: A.sub.2 (.OMEGA.)=D(.OMEGA.).multidot.A.sub.1.sup.2 (.OMEGA.), where A.sub.1.sup.2 (.OMEGA.) is the Fourier transform of the square of input optical pulse A.sub.1 and A.sub.2 (.OMEGA.) is the Fourier transform of output optical pulse A.sub.2, to engineer gratings for frequency-conversion and chirp-adjustment.
    • 一种在非线性光学材料中具有中心角频率ω1,0的特征的超短输入光脉冲A1的同步啁啾调节和频率转换的装置和方法,其具有呈非周期性模式的准正交匹配(QPM)光栅 的区域Dj构成光栅。 通过光栅传递超短输入光脉冲A1产生啁啾调节和频率转换的输出光脉冲A2。 在优选实施例中,非线性光学材料是第二谐波发生器(SHG),使得从输入光脉冲A1产生的输出光脉冲A2是所述超短输入光脉冲A1的啁啾调节二次谐波。 在一般情况下,方法和装置使用从以下等式导出的传递函数+ E,Cir D + EE(OMEGA):+ E,cir A + EE 2(OMEGA)= + E,cir D + EE(OMEGA)xA + E,cir 12 + EE(OMEGA),其中A + E,cir 12 + EE(OMEGA)是输入光脉冲A1和+ E的平方的傅里叶变换,cir A + EE 2(OMEGA)是傅立叶 转换输出光脉冲A2,工程光栅进行变频和啁啾调节。