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    • 41. 发明授权
    • Method and apparatus for indirect adjustment of optical switch reflectors
    • 用于间接调整光开关反射器的方法和装置
    • US06819815B1
    • 2004-11-16
    • US10015539
    • 2001-12-12
    • Charles CorbalisJohn E. BowersShifu YuanDavid WelshRoger J. Helkey
    • Charles CorbalisJohn E. BowersShifu YuanDavid WelshRoger J. Helkey
    • G02B626
    • G02B6/3588G02B6/3512G02B6/3556G02B6/3586G02B6/4246
    • An optical switch embodiment includes a switching array of arranged to accomplish switching of input light beams to any of a plurality of output channels and an array of beam monitoring elements for indirectly measuring and providing information used for adjusting output beams. The beam monitoring element further includes means for measuring the angular misalignment and the positional misalignment of a monitor beam and adjusting the reflectors based on monitor beam information such that optical beams are output from the switch having the desired optical characteristics, such as optimized power. Another optical switch embodiment includes an array of rhomboid prism assemblies positioned to receive the output beams from the switching array and such that the beams are split into substantially parallel working and monitor beams. Whereby the working beams pass into the plurality of output channels and the monitor beams pass into the plurality of beam monitoring elements where they are measured to provide information for adjusting the angular misalignment and the positional misalignment of the working beam.
    • 光开关实施例包括一个开关阵列,其被设置成实现将输入光束切换到多个输出通道中的任一个的光束监视元件的阵列,用于间接测量和提供用于调整输出光束的信息。 光束监测元件还包括用于测量监视光束的角度偏移和位置偏移以及基于监视光束信息调整反射器的装置,使得光束从具有所需光学特性(例如优化功率)的开关输出。 另一光开关实施例包括一组菱形棱镜组件,其定位成接收来自开关阵列的输出光束,并且使得光束被分成基本上平行的工作和监视光束。 其中工作光束进入多个输出通道,监视光束进入多个光束监测元件,在那里它们被测量以提供用于调整工作光束的角度偏移和位置偏移的信息。
    • 44. 发明授权
    • Generation of high power optical pulses using flared mode-locked
semiconductor lasers and optical amplifiers
    • 使用喇叭形锁模半导体激光器和光放大器生成高功率光脉冲
    • US5799024A
    • 1998-08-25
    • US772129
    • 1996-12-19
    • John E. BowersAlan MarRoger J. HelkeyJudy Karin
    • John E. BowersAlan MarRoger J. HelkeyJudy Karin
    • H01S5/026H01S5/06H01S5/065H01S5/10H01S5/14H01S5/50H01S3/113
    • H01S5/14H01S5/065H01S5/50H01S5/026H01S5/0601H01S5/0609H01S5/1064
    • The mode-locked laser with improved pulse power output can be realized by combining an optical oscillator with a flared CW or modulated gain amplifier. An optical filter or isolator may be disposed between the oscillator and amplifier to avoid feedback of spontaneous noise. A two-segment laser is devised by providing a flared gain section between a modulated gain section and an absorber section within the integrated semiconductor laser. The flared section may taper from a larger modulated gain section to a smaller cross section absorber section or vice versa. Various combinations of absorber sections coupled to modulated gain sections by CW gain or passive flared gain sections may be combined with various arrangements of reflectors and tapered CW gain amplifiers are cascades of such amplifiers and modulated gain pairs. A saturable absorber may be used in a two-segment laser in which the absorber is bleachable and has a characteristic temperature which is increased during short time periods so that a passive gain is realized by the return pulse traveling through the saturable absorber provided that the returning pulse is timed to coincide with the temporal gain realized in the absorber.
    • 具有改善的脉冲功率输出的锁模激光器可以通过将光学振荡器与扩展的CW或调制增益放大器组合来实现。 滤光器或隔离器可以设置在振荡器和放大器之间以避免自发噪声的反馈。 通过在集成半导体激光器内的调制增益部分和吸收体部分之间提供扩张增益部分来设计双段激光器。 扩口部分可以从较大的调制增益部分逐渐变细到较小的横截面吸收体部分,反之亦然。 通过CW增益或被动扩张增益部分耦合到调制增益部分的吸收部分的各种组合可以与反射器的各种布置组合,并且锥形CW增益放大器是这种放大器和调制增益对的级联。 可饱和吸收器可以用在两段激光器中,其中吸收器是可漂白的并且具有在短时间段内增加的特征温度,使得通过可饱和吸收器行进的返回脉冲实现无源增益,只要返回 脉冲定时与吸收器中实现的时间增益一致。
    • 45. 发明授权
    • Dual coupler fiber optic recirculating memory
    • 双耦合光纤再循环存储器
    • US4479701A
    • 1984-10-30
    • US326215
    • 1981-12-01
    • Steven A. NewtonJohn E. BowersHerbert J. Shaw
    • Steven A. NewtonJohn E. BowersHerbert J. Shaw
    • G11C21/00G01S7/285G02B6/00G02B6/28G02B5/172
    • G02B6/29338G02B6/2821G02B6/2861G02B6/29332
    • A fiber optic recirculating memory is disclosed which utilizes dual couplers to form a splice-free recirculating memory device from a length of single mode optical fiber forming a loop which acts as a delay line and a second length of single mode optical fiber which provides an input end and an output end for the device. A single signal supplied as an input to the device will result in a series of output signals identical to the input signal, although at smaller, decreasing amplitudes; the invention prevents the first output signal from being substantially larger than the rest of the output signals, thus eliminating the need for protective circuitry on the output end or the rejection of the first output signal. In addition to being useful as a recirculating memory device for use in a system where data is generated at a rate faster than it can be accepted by a data processor, the invention may be used as a tap filter to pass a selected fundamental frequency and its harmonics, and to attenuate all other frequencies.
    • 公开了一种光纤再循环存储器,其利用双耦合器从一单一模式光纤的长度形成无拼接的循环存储器件,该单模光纤形成用作延迟线的环路和第二长度的单模光纤,其提供输入 端和输出端。 作为输入到设备的单个信号将产生与输入信号相同的一系列输出信号,尽管幅度较小,幅度较小。 本发明防止第一输出信号显着地大于其余的输出信号,从而消除了在输出端上对保护电路的需要或第一输出信号的抑制。 除了用作在数据以比数据处理器可以接受的速度更快的速度生成数据的系统中有用的本发明之外,本发明可以用作抽头滤波器以通过选定的基频,并且其 谐波,并衰减所有其他频率。
    • 50. 发明授权
    • High-efficiency heterostructure thermionic coolers
    • 高效异质结构热离子冷却器
    • US06403874B1
    • 2002-06-11
    • US09441787
    • 1999-11-17
    • Ali ShakouriJohn E. Bowers
    • Ali ShakouriJohn E. Bowers
    • H01L3534
    • H01L29/861H01J45/00H01L29/205H01L29/267
    • A heterostructure thermionic cooler and a method for making thermionic coolers, employing a barrier layer of varying conduction bandedge for n-type material, or varying valence bandedge for p-type material, that is placed between two layers of material. The barrier layer bandedge is at least kBT higher than the Fermi level of the semiconductor layer, which allows only selected, “hot” electrons, or electrons of high enough energy, across the barrier. The barrier layer is constructed to have an internal electric field such that the electrons that make it over the initial barrier are assisted in travel to the anode. Once electrons drop to the energy level of the anode, they lose energy to the lattice, thus heating the lattice at the anode. The barrier height of the barrier layer is high enough to prevent the electrons from traveling in the reverse direction.
    • 异质结构热离子冷却器和用于制造热离子冷却器的方法,使用放置在两层材料之间的用于n型材料的变化的导带的阻挡层或用于p型材料的变化的带状带。 阻挡层带边缘至少比半导体层的费米能级高kBT,其仅允许穿过势垒的选定的“热”电子或足够高能量的电子。 阻挡层被构造成具有内部电场,使得使其超过初始屏障的电子被辅助到行进到阳极。 一旦电子下降到阳极的能级,它们就会失去晶格的能量,从而在阳极处加热晶格。 阻挡层的势垒高度足够高以防止电子沿相反方向传播。