公开(公告)号：US06631238B2

公开(公告)日：2003-10-07

申请号：US09810851

申请日：2001-03-16

申请人： Hongdu Liu ,  Daxin Liu ,  Shizhuo Yin ,  Lee Lisheng Huang

发明人： Hongdu Liu ,  Daxin Liu ,  Shizhuo Yin ,  Lee Lisheng Huang

IPC分类号： G02B2728

CPC分类号： G02F1/09 ,  G02B6/266 ,  G02B6/2746 ,  G02F2201/17 ,  G02F2203/48

摘要： Randomly polarized light impinges upon a birefringent crystal, is split into orthogonal polarization components and emerges from the crystal separated by a walk-off distance. The light beams then impinge on polarization rotators that cause a rotation of the plane of polarization by +45° and −45°. The light then encounters a variable polarization rotator in which the plane of polarization is rotated through a angle that varies in response to an externally-applied control signal. The maximum operating range (0 to 100% attenuation) is achieved when the variable rotator is capable of rotations in the range ±45°. A second birefringent crystal functions as a beam displacer. The beams encounter two wave plates configured to produce rotation angles of 0° and 90° followed by a retroreflector. The reverse traverse of the attenuator causes the light to emerge at an output port attenuated in intensity.

摘要翻译： 随机偏振光照射在双折射晶体上，被分裂为正交偏振分量，并从离开距离的晶体中出现。 光束然后撞击偏振旋转器，使偏振平面旋转+ 45°和-45°。 光然后遇到可变偏振旋转器，其中偏振平面旋转通过响应于外部施加的控制信号而变化的角度。 当可变转子能够在±45°的范围内旋转时，可实现最大工作范围（0至100％衰减）。 第二种双折射晶体用作光束置换器。 光束遇到两个波片，配置为产生0°和90°的旋转角度，然后是后向反射器。 衰减器的反向导通使光在强度衰减的输出端口处出现。

公开(公告)号：US06493139B1

公开(公告)日：2002-12-10

申请号：US09811138

申请日：2001-03-16

申请人： Hongdu Liu ,  Daxin Liu ,  Shizhuo Yin ,  Lee Lisheng Huang

发明人： Hongdu Liu ,  Daxin Liu ,  Shizhuo Yin ,  Lee Lisheng Huang

IPC分类号： G02B2728

CPC分类号： G02F1/313 ,  G02B6/2746 ,  G02F1/09

摘要： The present invention relates to optical switches in which switching occurs by changing the rotation of the plane of polarization by application of an externally applied control signal, particularly to magneto-optical switches controlling the port by which light emerges from the switch by externally-applied magnetic fields. The switches of the present invention function for randomly polarized input light, producing similarly randomly polarized light at the appropriate output port. Specific embodiments relate to 1×2 and 1×4 switches in both single pass and dual pass embodiments. Single pass embodiments are switches in which light passes through the optical components in one direction emerging at the appropriate output port depending on the desired switching. Dual pass embodiments are switches in which the light makes a forward and reverse traverse of the switch with total reflection. Dual pass switches typically reduce crosstalk without increasing the size of the switch. Single pass embodiments using two Faraday rotators are also disclosed for reducing crosstalk.

摘要翻译： 本发明涉及通过施加外部施加的控制信号来改变偏振面的旋转而发生切换的光开关，特别是涉及通过外部施加的磁场控制光从开关出射的端口的磁光开关 领域。 本发明的开关用于随机偏振的输入光，在适当的输出端口产生类似的随机偏振光。 具体实施例涉及单通和双通道实施例中的1x2和1x4开关。 单通道实施例是其中光根据期望的切换在一个方向上穿过光学部件在适当的输出端口处出现的开关。 双通道实施例是这样的开关，其中光线使得开关具有全反射的正向和反向横越。 双通道开关通常可以在不增加开关尺寸的情况下降低串扰。 还公开了使用两个法拉第旋转器的单通道实施例以减少串扰。

公开(公告)号：US06580546B2

公开(公告)日：2003-06-17

申请号：US09922545

申请日：2001-08-03

申请人： Hongdu Liu ,  Shizhuo Yin ,  Daxin Liu ,  Lee Lisheng Huang

发明人： Hongdu Liu ,  Shizhuo Yin ,  Daxin Liu ,  Lee Lisheng Huang

IPC分类号： G02F109

CPC分类号： G02F1/09

摘要： The present invention relates to the use of magnetic materials in combination with magneto-optic materials to improve performance of Faraday rotator devices by enhancing the latching capability and reducing the driving current. Semi-hard magnetic materials are advantageously used in connection with some embodiments of the present invention. Placing such semi-hard magnetic materials in proximity with the magneto-optic material enhances latching and reduces the drive current required to cause switching. Encompassing both the magneto-optic material and the semi-hard magnetic material further reduces drive current requirements and enhances latching by reducing leakage of the magnetic field from its generation within the coil to the magneto-optic material. Some embodiments further include soft or semi-hard material encompassing the coil.

摘要翻译： 本发明涉及磁性材料与磁光材料的组合，以通过增强锁定能力和降低驱动电流来改善法拉第旋转器件的性能。 半硬磁性材料有利地与本发明的一些实施方案结合使用。 将这种半硬磁材料放置在与磁光材料附近的位置，增强了锁定并降低了导致开关所需的驱动电流。 涵盖磁光材料和半硬磁材料进一步降低了驱动电流要求，并通过减少磁场从线圈内的产生到磁光材料的泄漏来增强闩锁。 一些实施例还包括包围线圈的软或半硬材料。