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    • 7. 发明授权
    • Chromatic dispersion measurement
    • 色散测量
    • US06768541B2
    • 2004-07-27
    • US10306264
    • 2002-11-27
    • James Power GordonRobert Meachem JopsonHerwig Werner KogelnikLynn E. Nelson
    • James Power GordonRobert Meachem JopsonHerwig Werner KogelnikLynn E. Nelson
    • G01N2100
    • G01M11/333G01M11/335G01M11/336
    • In one method, two light signals, of the same optical frequency, but having orthogonal states of polarization, are transmitted through an optical device and the mean signal delay of each of the light signals is measured. Calculations, based upon disclosed relationships, provide the polarization-independent delay (&tgr;0) through the optical device based upon the mean signal delays (&tgr;g1 and &tgr;g(−1)) of each of the light signals. By comparing &tgr;0 at adjacent wavelengths, the chromatic dispersion of the optical device can be accurately measured even in the presence of PMD. In a second, similar method, four light signals of non-degenerate polarizations states that span Stokes space are utilized. In a modification of the above-described methods based on the measurement of pulse delays, the methods are adapted to the measurement of phase delays of sinusoidally modulated signals.
    • 在一种方法中,具有相同光频率但具有正交偏振状态的两个光信号通过光学器件传输,并且测量每个光信号的平均信号延迟。 基于公开的关系的计算基于每个光信号的平均信号延迟(taug1和taug(-1)),通过光学装置提供偏振无关延迟(τ0)。 通过比较相邻波长的τ0,即使在存在PMD的情况下也能够精确地测量光学器件的色散。 在第二种类似的方法中,利用跨越斯托克斯空间的非退化极化状态的四个光信号。 在基于脉冲延迟测量的上述方法的修改中,该方法适于测量正弦调制信号的相位延迟。
    • 9. 发明授权
    • Raman amplifier, pump source for use in a raman amplifier and method for amplifying an optical signal
    • 拉曼放大器,用于拉曼放大器的泵浦源和用于放大光信号的方法
    • US07206123B2
    • 2007-04-17
    • US10935286
    • 2004-09-08
    • Yoshihiro EmoriJake BromageLynn E. NelsonShu Namiki
    • Yoshihiro EmoriJake BromageLynn E. NelsonShu Namiki
    • H01S4/00H04B10/12
    • H01S3/06754H01S3/0078H01S3/06758H01S3/094011H01S3/0941H01S3/10069H01S3/1305H01S3/302H04B10/2916
    • A method, pump and Raman amplifier control an amount of stimulated Brillouin scattering (SBS) produced by the Raman amplifier pump so as to regulate a power penalty experienced by a receiver due to the SBS. A multi-mode semiconductor laser produces a multi-mode pump light having a dominate mode at a predetermined wavelength. At least a portion of the multi-mode pump light is coupled to a Raman gain medium in a forward pumping direction. A reflection sensor monitors reflected light that is at least partially reflected from said Raman gain medium. The reflection sensor has a passband characteristic that passes optical power of a dominate SBS peak of said reflected light, but suppresses other SBS peaks that are offset in wavelength from said dominate SBS peak. The optical power of the dominate SBS peak is compared to an optical power of the multi-mode pump light, and it is determined whether a result of the comparing step is above a predetermined threshold.
    • 一种方法,泵浦和拉曼放大器控制由拉曼放大器泵产生的受激布里渊散射(SBS)的量,以便调节由于SBS而导致的接收器所经受的功率损失。 多模半导体激光器产生具有预定波长的主导模式的多模式泵浦光。 至少一部分多模式泵浦光在正向泵送方向上耦合到拉曼增益介质。 反射传感器监测至少部分地从所述拉曼增益介质反射的反射光。 反射传感器具有通过所述反射光的主要SBS峰值的光焦度的通带特性,但抑制了波长偏离所述主导SBS峰值的其他SBS峰值。 将主要SBS峰值的光功率与多模式泵浦光的光功率进行比较,并且确定比较步骤的结果是否高于预定阈值。
    • 10. 发明授权
    • Method and apparatus for compensating for higher order PMD in a fiber transmission system
    • 用于补偿光纤传输系统中高阶PMD的方法和装置
    • US06385356B1
    • 2002-05-07
    • US09468968
    • 1999-12-22
    • Robert M. JopsonHerwig KogelnikLynn E. Nelson
    • Robert M. JopsonHerwig KogelnikLynn E. Nelson
    • G02B600
    • G02B6/278G02B6/29394H04B10/2569
    • In an optical fiber transmission system, higher order PMD compensation is realized with a sweeper device at the input to the fiber which converts the polarization of the light beam into a frequency dependent polarization whose rate of change is similar to the rate of change of one of the PSPs of the fiber. The frequency dependent polarization of the light beam is then aligned with one of the frequency-dependent PSPs at the input of the fiber. Furthermore, differential group delay dispersion for a given frequency can be reduced by employing a chromatic dispersion compensator prior to the receiver end of the fiber transmission system. Control of the polarization of the light beam can be facilitated by monitoring PMD in the system, or alternatively, monitoring an effect of PMD in the system, such as bit error rates.
    • 在光纤传输系统中,通过在光纤的输入处的扫掠装置实现更高阶的PMD补偿,其将光束的偏振转换成频率相关极化,其变化率类似于 光纤的PSP。 然后将光束的频率相关极化与光纤输入端的频率依赖PSP之一对准。 此外,通过在光纤传输系统的接收机端之前采用色散补偿器,可以减小给定频率的差分群延迟色散。 通过监视系统中的PMD,或者监视PMD在系统中的影响,比如误码率,可以方便控制光束的偏振。