公开(公告)号：US5200795A

公开(公告)日：1993-04-06

申请号：US401175

申请日：1989-08-31

Applicant: Byoung Y. Kim ,  Hee G. Park ,  Shangyuan Huang

Inventor： Byoung Y. Kim ,  Hee G. Park ,  Shangyuan Huang

IPC: G01J9/02 ,  G02B6/34 ,  H04B10/2581

CPC classification number: H04B10/2581 ,  G01J9/02 ,  G01J2009/0226 ,  G01J2009/0288 ,  G02B6/02047 ,  G02B6/29352

Abstract: A passive quadrature phase detection system for coherent fiber systems includes first and second optical detectors positioned to receive an output signal from the output end of an optical signal apparatus such as an interferometer, or the like. The optical signal from the apparatus includes light propagating in two propagation modes. As the light propagates away from the output end of the apparatus from the near field to the far field, the light in the two modes undergoes a relative phase shift of .pi./2 in accordance with the Guoy effect. The two detectors are positioned such that the first detector detects the intensity of light resulting from the interference between the two modes in the near field of the output signal, and such that the second detector detects the intensity of light resulting from the interference between the two modes in the far field of the output signal. The additional .pi./2 phase difference introduced between the two modes as the light propagates from the near field light to the far field causes the detected light intensities to be in phase quadrature. Electrical signals proportional to the detected light intensities can be processed to determine changes in the phase difference between the two modes within the apparatus. In preferred embodiments, the detection of the near field light intensity is accomplished at a position optically displaced from the output end of the apparatus.

Abstract translation: 用于相干光纤系统的无源正交相位检测系统包括第一和第二光学检测器，其定位成从诸如干涉仪之类的光信号装置的输出端接收输出信号。 来自该装置的光信号包括以两种传播模式传播的光。 当光从设备的输出端从近场传播到远场时，两种模式中的光根据Guoy效应经历pi / 2的相对相移。 两个检测器被定位成使得第一检测器检测由输出信号的近场中的两个模式之间的干扰产生的光的强度，并且使得第二检测器检测由两者之间的干扰导致的光的强度 输出信号的远场模式。 当光从近场光传播到远场时，在两种模式之间引入的额外的π/ 2相位差导致检测到的光强度相位正交。 可以处理与检测到的光强度成比例的电信号，以确定装置内的两种模式之间的相位差的变化。 在优选实施例中，近场光强度的检测是在从设备的输出端光学位移的位置处完成的。

公开(公告)号：US5192982A

公开(公告)日：1993-03-09

申请号：US684690

申请日：1991-04-11

Applicant: Antonio Lapucci

Inventor： Antonio Lapucci

IPC: G01B9/02 ,  G01J9/02

CPC classification number: G01J9/02 ,  G01J2009/0288

Abstract: For the detection of the wavefront of a beam, based on a Mach-Zehnder interferometric configuration, synchronous detection - which replaces a temporal scan or a spatial dimension of the array of sensors - is obtained by means of frequency coding of the fringes present in the function I(x,y).