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1. 发明授权

US4632552A Cleaved-coupled-cavity-laser-driven system for measuring small signals 失效
标题翻译：用于测量小信号的切割耦合腔激光驱动系统
公开(公告)号：US4632552A
公开(公告)日：1986-12-30
申请号：US708962
申请日：1985-03-06
申请人： Nils A. Olsson , Yan-Chi Shi
发明人： Nils A. Olsson , Yan-Chi Shi
IPC分类号： G01N21/45 , G01B9/02 , G01D5/26 , H01S5/0683 , H01S3/13
CPC分类号： H01S5/06832 , G01D5/266
摘要： A laser-driven interferometric signal sensing system has a cleaved-coupled cavity laser with separate stabilization servo loops of different time constants for the modulator and laser sections thereof. The laser section is biased above lasing threshold, and its stabilization loop is operated at a frequency twice the frequency of laser section bias current modulation. A laser loop feedback error signal is a function of predetermined, environmental-type, parameter variations in the sensing location and is processed to be a function of the second derivative of interferometer output intensity with respect to laser section current. That error signal is applied to modify laser section bias current in a direction to zero out the feedback signal.
摘要翻译：激光驱动干涉信号感测系统具有切割耦合腔激光器，其具有用于其调制器和激光器部分的具有不同时间常数的单独的稳定伺服环路。激光部分偏置在激光阈值以上，其稳定环路的工作频率是激光器部分偏置电流调制频率的两倍。激光环路反馈误差信号是感测位置中预定的环境型参数变化的函数，并且被处理为相对于激光截面电流的干涉仪输出强度的二阶导数的函数。该误差信号用于修改激光器部分偏置电流的方向以使反馈信号为零。

2. 发明授权

US4643521A Plural-channel optical rotary joint 失效
标题翻译：多通道光学旋转接头
公开(公告)号：US4643521A
公开(公告)日：1987-02-17
申请号：US628033
申请日：1984-07-05
申请人： Edward E. Harstead , Leon Klafter , Yan-Chi Shi
发明人： Edward E. Harstead , Leon Klafter , Yan-Chi Shi
IPC分类号： G02B26/02 , G02B6/24 , G02B6/35 , G02B6/36 , G02B6/40 , G02B26/08
CPC分类号： G02B6/352 , G02B6/3604 , G02B6/3546 , G02B6/3582 , G02B6/3586
摘要： An optical rotary joint has a first pair of light beam expanding graded index (GRIN) of refraction lenses coupled to ends of a first pair of lightguide fibers for coupling signals through the rotary joint interface in a first path which is coaxial with the axis of rotation in the interface. A second pair of lightguide fibers are coupled to a second pair of GRIN lenses off-axis and of much smaller diameter than the lenses of the first pair. Prisms couple signals between the off-axis lenses and a second path across the interface and which is also coaxial with the axis of rotation. Also shown is a method for compensating for lens irregularities.
摘要翻译：光学旋转接头具有耦合到第一对光导纤维的端部的第一对光束扩展渐变折射率（GRIN），用于通过旋转接头界面在与旋转轴线同轴的第一路径中耦合信号在界面中。第二对光导纤维与离开轴的第二对GRIN透镜耦合，并且比第一对的透镜小得多的直径。棱镜之间的耦合信号在离轴透镜和跨越界面的第二路径之间，并且也与旋转轴线同轴。还示出了用于补偿透镜不规则的方法。

3. 发明授权

US5440415A Optical successive modulation-muliplexing for fiber optical network 失效
标题翻译：光纤连续调制多光纤光纤网络
公开(公告)号：US5440415A
公开(公告)日：1995-08-08
申请号：US101881
申请日：1993-08-04
申请人： Mohamed M. Mekawi , Yan-Chi Shi
发明人： Mohamed M. Mekawi , Yan-Chi Shi
IPC分类号： H04J14/00 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152 , H04J14/02 , H04J14/04 , H04J14/06
CPC分类号： H04J14/0298
摘要： A multiple-access network communication system employs a single continuous-wave optical carrier which is successively modulated and multiplexed at a plurality of data access nodes. The data access nodes are cascaded along an optical propagation path, and at each such node, the optical carrier is impressed with an modulated electrical signal which corresponds to an electrical subcarrier having a subcarrier frequency which is uniquely responsive to its associated data access node. Local data at each such node is modulated electrically in accordance with a known modulation scheme, such as FSK modulation, the resulting modulated subcarrier being conducted to a respective optical modulator which impresses same upon the optical carrier. The optical carrier is periodically, with respect to the data access nodes, amplified by an optical amplifier, and ultimately conducted to a receiver where the optical carrier is detected and converted to a corresponding electrical signal. The electrical signal is then demultiplexed, illustratively by filters tuned to the subcarrier frequencies, each of which is then demodulated, whereby the original data signal is recovered. The invention can be implemented in bidirectional embodiments which permit modulated optical carrier to be propagated in opposite directions. In addition, a bidirectional embodiment can be provided with both optical carriers from a single laser source.
摘要翻译：多址网络通信系统采用在多个数据接入节点上连续调制和多路复用的单个连续波光载波。数据访问节点沿着光传播路径级联，并且在每个这样的节点处，光载波被照射调制的电信号，该调制电信号对应于具有对其相关联的数据接入节点唯一地响应的子载波频率的电副载波。每个这样的节点处的本地数据根据已知的调制方案（例如FSK调制）进行电调制，所得到的调制副载波被传送到相应的光调制器，其对光载波施加相同的光调制器。相对于数据接入节点，光载波被周期性地由光放大器放大，并且最终被传送到接收机，其中光载波被检测并被转换成相应的电信号。然后，电信号被解复用，通过调谐到子载波频率的滤波器被解复用，然后解调每个信号，从而恢复原始数据信号。本发明可以在允许调制的光载波沿相反方向传播的双向实施例中实现。此外，双向实施例可以提供有来自单个激光源的两个光学载体。

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