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    • 51. 发明授权
    • 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. HillMohammed Nazrul Islam
    • Kenneth O. HillMohammed Nazrul Islam
    • G02B626
    • G02B6/29355G02B6/2821G02B6/29395
    • 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。
    • 52. 发明申请
    • Micro-cavity laser
    • 微腔激光器
    • US20010033587A1
    • 2001-10-25
    • US09802442
    • 2001-03-09
    • CALIFORNIA INSTITUTE OF TECHNOLOGY
    • Oskar PainterMing CaiKerry J. VahalaPeter C. Sercel
    • H01S003/30
    • H01S3/0627G02B6/2821G02B6/2852H01S3/06H01S3/0604H01S3/08H01S3/083H01S3/094H01S3/1628H01S3/163H01S3/17H01S5/10H01S5/1032H01S5/1042H01S5/1075
    • The present invention is a micro-cavity laser and methods related thereto. In the preferred embodiments, the micro-cavity laser comprises a laser pump signal in a fiber waveguide which is optically coupled to a micro-cavity resonator through a fiber taper. The micro-resonator includes a gain medium necessary for lasing action. The lasing frequency can be determined based upon the gain medium, the micro-cavity structure, as well as frequency selective elements such as gratings incorporated into the micro-cavity. The tapered fiber waveguide permits the micro-cavity laser to operate without a break in the fiber waveguide. In the preferred embodiments, the micro-cavity resonator is constructed from a doped silica or a semiconductor material. The present invention provides a compact laser with improved emissions and coupling efficiencies. Alternative configurations include multiple micro-cavities on a single fiber waveguide and/or utilizing multiple waveguides attached to one or more micro-cavity resonators. The laser can be made to operate in a continuous-wave as opposed to self-pulsing mode.
    • 本发明是一种微腔激光器及其相关方法。 在优选实施例中,微腔激光器包括光纤波导中的激光泵浦信号,光纤波导通过光纤锥度光耦合到微腔谐振器。 微型谐振器包括用于激光作用所需的增益介质。 激光频率可以基于增益介质,微腔结构以及诸如结合到微腔中的光栅的频率选择元件来确定。 锥形光纤波导允许微腔激光器在光纤波导中不间断地工作。 在优选实施例中,微腔谐振器由掺杂二氧化硅或半导体材料构成。 本发明提供了具有改进的排放和耦合效率的紧凑型激光器。 替代配置包括单个光纤波导上的多个微腔和/或利用连接到一个或多个微腔谐振器的多个波导。 可以使激光器在连续波中操作,而不是自脉冲模式。