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    • 1. 发明授权
      US06229937B1 Circularly polarized fiber in optical circuits 失效
    • Circularly polarized fiber in optical circuits
    • 光电路中的圆偏振光纤
    • US06229937B1
    • 2001-05-08
    • US09339446
    • 1999-06-24
    • Daniel Aloysius Nolan , Mohammed Nazrul Islam
    • Daniel Aloysius Nolan , Mohammed Nazrul Islam
    • G02B628
    • G02B6/274 , G02B6/105 , G02B6/2706 , G02B6/2766 , G02B6/29361 , G02B6/4215 , H04B10/532 , H04J14/02 , H04J14/06
    • The invention is directed to circularly polarized single mode waveguide fiber and to high data rate, multiplexed transmission systems that employ this fiber. The circularly polarized waveguide fiber attenuates the non-linear effects present in such high performance transmission links. In particular, self phase modulation is attenuated by more than 30% and four wave mixing is essentially eliminated. This latter effect occurs because four wave mixing does not occur when a multiplexed link is made of a plurality of circularly polarized waveguide fibers which are arranged so that adjacent fibers have opposite circular polarization. The circularly polarized fiber enhances the non-linear effect of cross phase modulation, a feature that can be used in optical switching components associated with the transmission link. In addition, the strength of the XPM in CPF is independent of the relative polarization states of the signal and control pulses.
    • 本发明涉及圆偏振单模波导光纤以及采用该光纤的高数据速率复用传输系统。 圆偏振波导纤维衰减了这种高性能传输链路中存在的非线性效应。 特别地，自相位调制被衰减超过30％，并且基本上消除了四个波混频。 发生后一种影响是因为当多路复用链路由多条圆极化波导纤维制成时，不发生四波混频，这些波导纤维布置成使相邻的光纤具有相反的圆极化。 圆偏振光纤增强了交叉相位调制的非线性效应，该特征可用于与传输链路相关联的光交换部件中。 此外，CPF中的XPM的强度与信号和控制脉冲的相对极化状态无关。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 2. 发明授权
      US06239903B1 Nonlinear fiber amplifiers for a 1430-1530nm low-loss window in optical fibers 有权
    • Nonlinear fiber amplifiers for a 1430-1530nm low-loss window in optical fibers
    • 用于光纤中1430-1530nm低损耗窗口的非线性光纤放大器
    • US06239903B1
    • 2001-05-29
    • US09558300
    • 2000-04-25
    • Mohammed Nazrul Islam , Hayden Henry Harris
    • Mohammed Nazrul Islam , Hayden Henry Harris
    • H01S3067
    • H04B10/291 , H01S3/06754 , H01S3/1083 , H01S3/302 , H04B10/2916 , H04B2210/003 , H04B2210/258
    • An apparatus and method are described for exploiting almost the full almost 25 THz of bandwidth available in the low-loss window in optical fibers (from 1430 nm to 1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths &lgr;r should lie in close proximity to the zero-dispersion wavelength &lgr;0 of the amplifying fiber. For this intermediate Raman order, spectral broadening will occur due to phase-match with four-wave mixing (if &lgr;r &lgr;0). In further cascaded Raman orders, the gain spectrum will continue to broaden due to the convolution of the gain spectrum with the spectrum from the previous Raman order.
    • 描述了一种使用光放大器的并联组合来利用光纤（从1430nm到1620nm）的低损耗窗口中几乎全部近25个THz的带宽的装置和方法。 使用掺铒光纤放大器（EDFA）可以放大约1530 nm-1620 nm的低损耗窗口。 然而，由于较短波长的铒的固有吸收，EDFA不能在低于约1525nm的范围内使用，而性能没有明显降低。 对于大约1430-1530nm的低损耗窗口，可以有效地使用基于光纤中非线性偏振的放大器。 公开了宽带非线性偏振放大器（NLPA），其将级联拉曼放大与参数放大或四波混频组合。 特别地，中间级联拉曼级别波长lambdr之一应该靠近放大光纤的零色散波长lambd0。 对于这种中间拉曼次序，由于与四波混频（如果lambdr lambd0）的相位匹配，将发生频谱展宽。 在进一步的级联拉曼级数中，由于增益谱与来自先前的拉曼序列的光谱的卷积，增益谱将继续扩大。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 3. 发明授权
      US06239902B1 Nonlinear fiber amplifiers used for a 1430-1530nm low-loss window in optical fibers 有权
    • Nonlinear fiber amplifiers used for a 1430-1530nm low-loss window in optical fibers
    • 用于光纤中的1430-1530nm低损耗窗口的非线性光纤放大器
    • US06239902B1
    • 2001-05-29
    • US09565776
    • 2000-05-05
    • Mohammed Nazrul Islam , Hayden Henry Harris
    • Mohammed Nazrul Islam , Hayden Henry Harris
    • H01S300
    • H04B10/291 , H01S3/06754 , H01S3/1083 , H01S3/302 , H04B10/2916 , H04B2210/003 , H04B2210/258
    • An apparatus and method are described for exploiting almost the full almost 25TH% of bandwidth available in the low-loss window in optical fibers (from 1430 nm-1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths &lgr;r should lie in close proximity to the zero-dispersion wavelength &lgr;0 of the amplifying fiber. For this intermediate Raman order, spectral broadening will occur due to phase-match 15 with four-wave mixing (if &lgr;o
    • 描述了一种利用光放大器的并联组合来利用光纤（来自1430nm-1620nm）的低损耗窗口几乎25％左右的带宽的装置和方法。 使用掺铒光纤放大器（EDFA）可以放大约1530 nm-1620 nm的低损耗窗口。 然而，由于较短波长的铒的固有吸收，EDFA不能在低于约1525nm的范围内使用，而性能没有明显降低。 对于大约1430-1530nm的低损耗窗口，可以有效地使用基于光纤中非线性偏振的放大器。 公开了宽带非线性偏振放大器（NLPA），其将级联拉曼放大与参数放大或四波混频组合。 特别地，中间级联拉曼级别波长lambdr之一应该靠近放大光纤的零色散波长lambd0。 对于这种中间拉曼次序，由于具有四波混频（如果lambdo
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 6. 发明授权
      US06400870B1 Symmetric interferometers unbalanced by using light exposure to tailor the spectral behavior 失效
    • Symmetric interferometers unbalanced by using light exposure to tailor the spectral behavior
    • 对称干涉仪通过使用光照不平衡来定制光谱行为
    • US06400870B1
    • 2002-06-04
    • US09480166
    • 2000-01-10
    • Kenneth O. Hill , Mohammed Nazrul Islam
    • Kenneth O. Hill , Mohammed Nazrul Islam
    • G02B626
    • G02B6/29355 , G02B6/2821 , G02B6/29395
    • Unbalanced Mach-Zehnder interferometers (MZI) are useful for a number of applications including wavelength filters, gain flattening or gain equalization elements, and band splitters or combiners. A MZI is comprised of two couplers surrounding a phase shifting region, which consists of two arms with differential propagation constants. We disclose a means of using light exposure to unbalance a symmetric MZI consisting of substantially the same lengths of substantially the same fiber. In particular, the index of refraction of a fiber can be increased by exposure to ultraviolet light, and the magnitude of the change can be increased by using higher germanium doping or by hydrogen loading the fiber. The magnitude of the phase shift can be controlled accurately by varying the fiber length exposed, the light exposure intensity, the light exposure time, and the hydrogen loading or fiber composition. In addition, exposing the other arm,of the MZI to trim back the phase shift can compensate any over-exposure of the fiber. By starting with a symmetric MZI made from substantially the same fiber, low polarization sensitivity or polarization dependent loss can be achieved, and the device can operate over a wider overall wavelength range. Also, by using a MZI with substantially the same lengths of fibers and by placing those fibers parallel to one another, low environmental sensitivity can be achieved. Moreover, the use of light exposure to unbalance the MZI has the advantage of enabling precise tailoring of the spectral response with ease of manufacturing and high yields. The MZI devices can be cascaded to achieve more complicated filtering functions in lattice devices such as Lyot-Ohman filters or Solc filters.
    • 不平衡马赫 - 策德尔干涉仪（MZI）可用于多种应用，包括波长滤波器，增益平坦化或增益均衡元件以及带分离器或组合器。 MZI由围绕相移区域的两个耦合器组成，该耦合器由具有差分传播常数的两个臂组成。 我们公开了使用曝光不平衡对称MZI的手段，该对称MZI由基本上相同长度的基本上相同的纤维组成。 特别地，可以通过暴露于紫外光来增加纤维的折射率，并且可以通过使用较高的锗掺杂或通过氢负载纤维来提高变化的幅度。 可以通过改变曝光的光纤长度，曝光强度，曝光时间和氢气负载量或纤维组成来精确地控制相移的大小。 此外，MZI的其他臂暴露以减少相移可以补偿光纤的任何过度曝光。 通过从基本上相同的光纤制成的对称MZI开始，可以实现低极化灵敏度或偏振相关损耗，并且器件可以在更宽的整体波长范围内工作。 此外，通过使用具有基本上相同长度的纤维的MZI并且通过将这些纤维彼此平行放置，可以实现低环境灵敏度。 此外，使用曝光不平衡的MZI具有使得能够容易地制造和高产量的光谱响应的精确定制的优点。 可以级联MZI器件，以在诸如Lyot-Ohman滤波器或Solc滤波器之类的晶格器件中实现更复杂的滤波功能。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 7. 发明授权
      US6101024A Nonlinear fiber amplifiers used for a 1430-1530nm low-loss window in optical fibers 失效
    • Nonlinear fiber amplifiers used for a 1430-1530nm low-loss window in optical fibers
    • 用于光纤中的1430-1530nm低损耗窗口的非线性光纤放大器
    • US6101024A
    • 2000-08-08
    • US46900
    • 1998-03-24
    • Mohammed Nazrul Islam , Hayden Henry Harris
    • Mohammed Nazrul Islam , Hayden Henry Harris
    • H01S3/06 , H01S3/067 , H01S3/10 , H01S3/108 , H01S3/30 , H04B10/291 , G02B6/26 , G02B6/42
    • H04B10/291 , H01S3/06754 , H01S3/302 , H04B10/2916 , H01S3/1083 , H04B2210/003 , H04B2210/258
    • An apparatus and method are described for exploiting almost the full almost 25 THz of bandwidth available in the low-loss window in optical fibers (from 1430 nm to 1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths .lambda..sub.r should lie in close proximity to the zero-dispersion wavelength .lambda..sub.0 of the amplifying fiber. For this intermediate Raman order, spectral broadening will occur due to phase-match with four-wave mixing (if .lambda..sub.r .lambda..sub.0). In further cascaded Raman orders, the gain spectrum will continue to broaden due to the convolution of the gain spectrum with the spectrum from the previous Raman order.
    • 描述了一种使用光放大器的并联组合来利用光纤（从1430nm到1620nm）的低损耗窗口中几乎全部近25个THz的带宽的装置和方法。 使用掺铒光纤放大器（EDFA）可以放大约1530 nm-1620 nm的低损耗窗口。 然而，由于较短波长的铒的固有吸收，EDFA不能在低于约1525nm的范围内使用，而性能没有明显降低。 对于大约1430-1530nm的低损耗窗口，可以有效地使用基于光纤中非线性偏振的放大器。 公开了宽带非线性偏振放大器（NLPA），其将级联拉曼放大与参数放大或四波混频组合。 特别地，中间级联拉曼阶波长λr之一应该靠近放大光纤的零色散波长λ0。 对于这种中间拉曼次序，由于与四波混频（如果λr <λ0）或相位匹配参数放大（如果λr>λ0）的相位匹配，将发生频谱展宽。 在进一步的级联拉曼级数中，由于增益谱与来自先前的拉曼序列的光谱的卷积，增益谱将继续扩大。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Global Dossier Espacenet 法律信息 同族专利 专利引用
    • 10. 发明授权
      US06606187B1 Nonlinear fiber amplifiers used for a 1430-1530 nm low-loss window in optical fibers 有权
    • Nonlinear fiber amplifiers used for a 1430-1530 nm low-loss window in optical fibers
    • 用于光纤中1430-1530 nm低损耗窗口的非线性光纤放大器
    • US06606187B1
    • 2003-08-12
    • US09694858
    • 2000-10-23
    • Mohammed Nazrul Islam , Hayden Henry Harris
    • Mohammed Nazrul Islam , Hayden Henry Harris
    • H01S330
    • H04B10/291 , H01S3/06754 , H01S3/1083 , H01S3/302 , H04B10/2916 , H04B2210/003 , H04B2210/258
    • An apparatus and method are described for exploiting almost the full almost 25 THz of bandwidth available in the low-loss window in optical fibers (from 1430 nm to 1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths &lgr;r should lie in close proximity to the zero-dispersion wavelength &lgr;0 of the amplifying fiber. For this intermediate Raman order, spectral broadening will occur due to phase-match with four-wave mixing (if &lgr;r &lgr;0). In further cascaded Raman orders, the gain spectrum will continue to broaden due to the convolution of the gain spectrum with the spectrum from the previous Raman order.
    • 描述了一种使用光放大器的并联组合来利用光纤（从1430nm到1620nm）的低损耗窗口中几乎全部近25个THz的带宽的装置和方法。 使用掺铒光纤放大器（EDFA）可以放大约1530 nm-1620 nm的低损耗窗口。 然而，由于较短波长的铒的固有吸收，EDFA不能在低于约1525nm的范围内使用，而性能没有明显降低。 对于大约1430-1530nm的低损耗窗口，可以有效地使用基于光纤中非线性偏振的放大器。 公开了宽带非线性偏振放大器（NLPA），其将级联拉曼放大与参数放大或四波混频组合。 特别地，中间级联拉曼级别波长lambdr之一应该靠近放大光纤的零色散波长lambd0。 对于这种中间拉曼次序，由于与四波混频（如果lambdr lambd0）的相位匹配，将发生频谱展宽。 在进一步的级联拉曼级数中，由于增益谱与来自先前的拉曼序列的光谱的卷积，增益谱将继续扩大。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
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