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    • 2. 发明授权
    • Mode-locked laser method and apparatus
    • 锁模激光方法和装置
    • US07079558B2
    • 2006-07-18
    • US10999711
    • 2004-11-30
    • Faming XuQiang FuBrian RogersZhengyu ChenWentao Hu
    • Faming XuQiang FuBrian RogersZhengyu ChenWentao Hu
    • H01S3/98H01S3/13H01S3/00
    • H01S3/136H01S3/08H01S3/08045H01S3/1068H01S3/1109H01S3/1305H01S3/139
    • A method and apparatus for stabilizing the output of a mode-locked laser by monitoring the temporal behavior of the pulse train profile and controlling the laser cavity optical length and/or loss modulation frequency accordingly. A mismatch of the cavity optical length and the loss modulation frequency will yield a first characteristic noise condition on the laser beam pulse train when the optical length is too short for a given loss modulation frequency and a second, different noise condition when the optical length is too long. The laser beam is monitored and analyzed to determine which noise condition is present. The cavity optical length is adjusted accordingly by movement of one or more optical elements or by changing the index of refraction of one or more optical elements. In the alternative, or additionally, the loss modulation frequency can be adjusted to bring the laser back into mode lock.
    • 一种用于通过监视脉冲序列轮廓的时间特性并相应地控制激光腔光学长度和/或损失调制频率来稳定锁模激光器的输出的方法和装置。 当光学长度对于给定的损耗调制频率来说太短时,激光束脉冲串上的光学长度和损耗调制频率的不匹配将产生第一特征噪声条件,当光学长度为 太长。 监测和分析激光束以确定存在哪种噪声条件。 相应地通过一个或多个光学元件的移动或通过改变一个或多个光学元件的折射率来调整腔光学长度。 在替代方案中,或者另外,可以调整损耗调制频率以使激光器恢复模式锁定。
    • 7. 发明授权
    • Method and apparatus for filtering an optical beam
    • 用于过滤光束的方法和装置
    • US06879619B1
    • 2005-04-12
    • US09626526
    • 2000-07-27
    • Evan D. H. GreenWilliam B. Chapman
    • Evan D. H. GreenWilliam B. Chapman
    • G02B5/28G02B6/34G02B7/00G02B26/00H01S5/022H01S5/0687H01S5/14H04J14/02H01S3/98
    • H01S5/141G02B5/281G02B5/284G02B6/29358G02B6/29361G02B6/29395G02B26/002G02B26/007H01S3/1062H01S5/02248H01S5/02284H01S5/0687H04J14/02
    • The invention pertains to wavelength-agile optical filters suitable for wavelength-division-multiplexed (WDM) optical communications networks. More particularly, the invention pertains to optical filters with a wavelength reference that can be remotely switched to arbitrarily selectable channels on a standard grid, and to re-configurable optical communications networks employing same. The present invention provides a communication apparatus with a tunable filter which may be used in a wide range of applications including tuning an external cavity laser (ECL), selecting a wavelength for an add/drop multiplexer and providing channel selection and feedback for a wavelength locker. The filter may be utilized as a discrete component or in combination with circulators, wavelength lockers and gain medium. The filter may be implemented in whole or in part as part of a gain medium. The tunable filter exhibits a compact form factor and precise tuning to any selected wavelength of a predetermined set of wavelengths comprising a wavelength grid. The tunable filter may thus be utilized in telecom applications to generate the center wavelengths for any channel on the ITU or other optical grid.
    • 本发明涉及适用于波分复用(WDM)光通信网络的波长敏捷光学滤波器。 更具体地,本发明涉及具有波长参考的光学滤波器,其可以远程地切换到标准网格上的任意可选择的信道,以及使用其的可重新配置的光通信网络。 本发明提供了一种具有可调谐滤波器的通信装置,其可以在广泛的应用中使用,包括调谐外腔激光器(ECL),为加/减多路复用器选择波长,并为波长锁定器提供信道选择和反馈 。 滤波器可以用作分立元件或与循环器,波长锁存器和增益介质组合使用。 滤波器可以全部或部分地实现为增益介质的一部分。 可调谐滤波器具有紧凑的外形尺寸并且精确调谐到包括波长网格的预定波长组的任何选定波长。 因此,可调谐滤波器可以用于电信应用中,以产生ITU或其他光栅上的任何信道的中心波长。