System and method for polarization detection based on silicon-based liquid crystal
A silicon-based liquid crystal and detection system technology, which is applied in the fields of optics, polarization state detection and polarization control, can solve the problems of limited application scenarios of polarization detection systems, and achieve the effect of simplifying polarization-related devices and systems
Active Publication Date: 2015-05-13
HUAZHONG UNIV OF SCI & TECH
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[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a polarization detection system and method based on liquid crystal on silicon, the purpose of which is to realize the detection and control of the polarization state of the beam through the controllable phase modulation of liquid crystal on silicon. This solves the technical problem of limited application scenarios of existing polarization detection systems
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Embodiment 2
[0064] The flow chart of the polarization detection method of embodiment 2 is as image 3 As shown, in the specific modulation process, with a phase modulation accuracy of 1°, the phase θ from 0 to 2π is loaded on the P polarization component; a series of light intensity values I are obtained by the detection of the photodetector, and θ- I curve;
[0065] There are two trough coordinates on the θ-I curve (θ i , I i ), θ i means I i Loaded phase at light intensity, i = 1 or 2; look for the first trough on the θ-I curve (θ 1 , I 1 ) adjacent points (θ m , I m ), the second trough (θ 2 , I 2 ) adjacent points (θ n ,I n ), m is not equal to n;
[0066] According to the analysis of the functional relationship between the light intensity and the loading phase established by the present invention, it is known that when the light intensity value is 0, the corresponding coordinate points are two valley points on the θ-I curve, and these two valley points correspond to T...
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The invention discloses a system and a method for polarization detection based on a silicon-based liquid crystal; the polarization detection system comprises a polarization analyzer, a light detector, a silicon-based liquid crystal driving module, a control unit and a silicon-based liquid crystal for phase modulation; the silicon-based liquid crystal performs phase modulation to the to-be-detected light under the driving of the silicon-based liquid crystal driving module, acquires a series of polarization light and acquires the polarization information of the to-be-detected light by the analysis of a series of the polarization light; and the polarization information comprises amplitudes and phase differences in the vertical direction and the horizontal direction. The system detects and controls the polarization state under precise programmable control and is not limited by the similar wavelength sensitivity of wave plates; with adoption of the silicon-based liquid crystal for phase modulation, the response time is optimized remarkably; meanwhile, the system has the characteristic of realizing light polarization state detection and control integration and has wide application scenes.
Description
technical field [0001] The invention belongs to the technical field of polarization detection and polarization control in the field of optics, and more specifically relates to a polarization detection system and method based on silicon-based liquid crystals. Background technique [0002] Polarization is one of the basic characteristics of light. Polarized light has been widely used, such as 3D movies, LCD display technology, high-definition photography technology, polarization multiplexing technology in the field of optical communication, etc.; in various fields of polarized light applications, are Involves the detection or control of the polarization state of light. For example, in an optical fiber communication system, it is necessary to evaluate the polarization mode dispersion of a section of optical fiber or a communication system. The first step is to accurately detect the polarization information of the transmitted signal before subsequent analysis can be performed. ...
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Inventor 付松年洪志坤于大伟唐明刘德明
Owner HUAZHONG UNIV OF SCI & TECH