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    • 2. 发明授权
    • Asymmetric optical waveguides for minimizing bending losses and
techniques for fabricating same
    • 用于最小化弯曲损耗的非对称光波导及其制造技术
    • US5018811A
    • 1991-05-28
    • US555202
    • 1990-07-18
    • John R. HaavistoEdward P. Ayers
    • John R. HaavistoEdward P. Ayers
    • G02B6/125G02B6/134
    • G02B6/125G02B6/1345
    • A generally circular or elliptical waveguide (2) is fabricated within a substrate (3) such that the waveguide is surrounded by two different indices of refraction, with the index inside the waveguide ring being greater than the index outside the ring. This results, in combination with a varying index of refraction profile across the width of the waveguide inself, in a tendency to confine mode energy away from the outer perimeter of the waveguide ring where leakage is most likely to occur. As a result the asymmetrical index profile compensates for the curvature of the waveguide, wave phase front velocities are made uniform, and the mode energy remains confined within the waveguide. A two step ion exchange technique is disclosed for selectively increasing the index of refraction of the substrate and for forming the variable index of refraction profile within the waveguide.
    • 在衬底(3)内制造大致圆形或椭圆形的波导(2),使得波导被两个不同的折射率包围,波导环内的折射率大于环外的折射率。 这导致与波导自身宽度上的折射率变化的折射率分布结合在一起的趋势是将模式能量限制在最可能发生泄漏的波导环的外周边。 结果,不对称折射率分布补偿了波导的曲率,使波相位前沿速度均匀,并且模式能量保持限制在波导内。 公开了一种两步离子交换技术,用于选择性地增加衬底的折射率并在波导内形成可变折射率折射率。
    • 3. 发明授权
    • Multichannel optical wave guide resonator
    • 多通道光波导谐振器
    • US4630885A
    • 1986-12-23
    • US585577
    • 1984-03-02
    • John R. Haavisto
    • John R. Haavisto
    • G02B6/122G01C19/72G02B6/12G02B6/26
    • G01C19/727
    • A multichannel optical waveguide resonator having a plurality of evanescently coupled optical dielectric waveguide rings and an input optical waveguide and an output optical waveguide located adjacent to one of the waveguide rings. The input and output dielectric waveguides are located for evanescent wave coupling of light into and out of one of the waveguide rings. The perimeters of the waveguide rings and the spacing therebetween are selected for evanescent coupling between the waveguides and so that light in the input waveguide reinforces with light in one of the concentric waveguides to create a resonator having an increased effective perimeter.
    • 一种多通道光波导谐振器,具有多个渐逝耦合的光电介质波导环和输入光波导以及位于波导环之一附近的输出光波导。 输入和输出介质波导位于光入射到一个波导环的光的瞬逝波耦合。 选择波导环的周长和它们之间的间隔用于波导之间的ev逝耦合,并且使得输入波导中的光加强在同心波导之一中的光,以产生具有增加的有效周长的谐振器。
    • 6. 发明授权
    • Thin film passive ring resonator laser gyro
    • 薄膜无源环形谐振腔激光陀螺仪
    • US4658401A
    • 1987-04-14
    • US589711
    • 1984-03-15
    • Joseph P. SegreJohn R. Haavisto
    • Joseph P. SegreJohn R. Haavisto
    • G01C19/72H01S3/083H01S3/10
    • G01C19/727H01S3/083
    • Passive ring resonator laser gyro in which the clockwise and counterclockwise beams do not coexist in the resonator. The laser gyro employs thin film technology. In particular, the preferred laser is a gallium aluminum arsenide laser. Light from the laser is phase-modulated by means of a thin film electro-optic modulator comprising a channel waveguide disposed on an electrically active material and flanked by electrodes for modulating the phase of light from the laser. An electro-optic switch is provided for switching light from the laser to inject alternatingly clockwise and counterclockwise beams into the resonator. The resulting gyro is extremely compact and simply implemented into an integrated, thin film package. Because the clockwise and counterclockwise beams do not coexist in the resonator, various beam interaction effects such as beats, backscatter and feedback into the laser are eliminated.
    • 无源环谐振器激光陀螺仪,其中顺时针和逆时针光束不共存在谐振器中。 激光陀螺采用薄膜技术。 特别地,优选的激光器是砷化铝砷化镓激光器。 来自激光器的光通过薄膜电光调制器进行相位调制,该薄膜电光调制器包括设置在电活性材料上并且侧面由用于调制来自激光器的光的相位的电极的通道波导。 提供电光开关用于切换来自激光器的光,将交替顺时针和逆时针光束注入谐振器。 所得到的陀螺仪非常紧凑,简单地实现为集成的薄膜封装。 由于顺时针和逆时针光束不共存在谐振器中,所以消除了诸如拍子,后向散射和反馈到激光器中的各种波束相互作用效应。
    • 8. 发明授权
    • Open loop thin film laser gyro
    • 开环薄膜激光陀螺仪
    • US4674881A
    • 1987-06-23
    • US603771
    • 1984-04-25
    • Anthony W. LawrenceJohn R. HaavistoTimothy Williams
    • Anthony W. LawrenceJohn R. HaavistoTimothy Williams
    • G01P9/00G01C19/64G01C19/72H01S3/083H01S5/00G01B9/02
    • G01C19/727
    • The laser gyro includes a laser and a ring resonator. Apparatus is provided for coupling counter-propagating beams of light from the laser into the resonator. The frequency of the laser is scanned across the resonance frequency of the resonator in steps superimposed on a dc level. The intensity of light in one of the counter-propagating beams is detected during each of the steps and the difference in intensity of the detected light is determined. The difference in the intensity of the detected light is used to alter the dc level of the steps so as to drive the difference to zero. The intensity of light in the other of the counter propagating beams is detected during each of the steps and the difference in intensity is also detected. This difference is indicative of the rotation rate of the gyro.
    • 激光陀螺仪包括激光和环形谐振器。 提供了用于将来自激光器的反向传播光束耦合到谐振器中的装置。 激光器的频率在叠加在直流电平上的步骤中跨谐振器的谐振频率扫描。 在每个步骤期间检测一个反向传播光束中的光的强度,并且确定检测到的光的强度差。 使用检测光的强度差来改变步骤的直流电平,以将差值驱动到零。 在每个步骤期间检测另一个反向传播光束中的光的强度,并且还检测强度差异。 该差异表示陀螺仪的旋转速度。
    • 9. 发明授权
    • Passive resonant optical microfabricated inertial sensor and method
using same
    • 无源谐振光学微制造惯性传感器及其使用方法
    • US5872877A
    • 1999-02-16
    • US800653
    • 1997-02-04
    • John R. Haavisto
    • John R. Haavisto
    • G01C19/72G02B6/26G01B9/02
    • G01C19/727
    • Simple passive ring resonator laser gyro. The gyro eliminates the need to separately control the frequency of the two oppositely directed beams. The gyro eliminates the need to alternatively switch the light source at fixed steps of time between the two frequencies at which each of the oppositely directed beams are in resonance. A semiconductor laser diode, the beam source, is locked to one signal and its output is coupled into a closed geometric shape waveguide resonator and then sampled by detectors. The laser beam is maintained at the resonant frequency of one of the directions of propagation in the waveguide resonator. This frequency is determined by a process of modulating and demodulating the beam with a substantially sinusoidal waveform. As such the gyro need not actively switch the laser between the resonant frequencies of both of the directions of propagation in the waveguide resonator. This results in a gyro that has less noise, improved signal quality, and reduced complexity and cost of fabrication.
    • 简单的无源环形谐振腔激光陀螺仪。 陀螺仪消除了分别控制两个相反方向的波束的频率的需要。 陀螺仪消除了在两个频率之间的固定的时间段以交替地切换光源的需要,在这两个频率之间,每个相对方向的波束处于共振状态。 半导体激光二极管,光束源被锁定到一个信号,并且其输出耦合到封闭的几何形状波导谐振器中,然后由检测器采样。 激光束保持在波导谐振器中传播方向之一的谐振频率。 该频率由具有基本正弦波形的波束的调制和解调的处理决定。 因此,陀螺仪不需要在波导谐振器的两个传播方向的谐振频率之间主动切换激光。 这导致陀螺仪具有较少的噪声,改善的信号质量以及降低的复杂性和制造成本。