Unlock instant, AI-driven research and patent intelligence for your innovation.

A phase modulator half-wave voltage measurement system and measurement method

A technology of phase modulator and half-wave voltage, which is applied in the direction of measuring electrical variables, measuring only voltage, and measuring devices. It can solve problems such as complex systems, high requirements for asymmetry, and limited measurement accuracy. Guarantee the effect of time domain matching and accurate measurement

Active Publication Date: 2019-06-25
SOUTH CHINA NORMAL UNIVERSITY
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This measurement method is relatively simple, but due to the instability of the light source and other factors, the measurement accuracy of this method is limited.
The extreme value method to measure the half-wave voltage also has the disadvantages of sensitive and unstable optical path difference, complex system, high cost, and easy to be affected by the external environment.
The half-wave voltage measurement method based on the Sagnac fiber interferometer solves the problem of sensitivity and instability of the optical path difference. Since the optical path of the two paths of light is the same, the system is stable, but the system requires asymmetry. very tall, difficult to build

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A phase modulator half-wave voltage measurement system and measurement method
  • A phase modulator half-wave voltage measurement system and measurement method
  • A phase modulator half-wave voltage measurement system and measurement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this embodiment, pulsed light is used as input light, such as figure 1 As shown, the half-wave voltage measurement system in this embodiment includes a polarization controller 1, a polarization-independent circulator 2, a polarization beam splitter 3, a first Faraday reflection rotating mirror 5, a second Faraday reflection rotation mirror 7, a third Faraday reflection A rotating mirror 4, a polarization-independent phase modulator 6, a driving power source 8, a polarizer 9, a photoelectric converter, and an oscilloscope, wherein the circulator 2 includes three ports, which are respectively port A, port B, and port C; The polarization beam splitter 3 includes four ports, which are respectively port A, port B, port C, and port D;

[0032] Wherein the output terminal of the polarization controller 1 is connected with the port A of the circulator 2, the port B of the circulator 2 is connected with the port A of the polarization beam splitter 3, and the port B and the po...

Embodiment 2

[0035]Continuous light is used as the input light, and the half-wave voltage measurement system of this embodiment is consistent with that of Embodiment 1. The input continuous light passes through the polarization beam splitter 3 and is divided into components in two directions: the transmission component and the reflection component. When the pulse width of the driving power supply 8 is set to different characteristic values, the modulation effect is different.

[0036] When the pulse width of the driving power source 8 is set to be greater than the time difference between the two components entering the polarization beam splitter 3 passing through the phase modulator 6 successively at the same moment. The components in both directions will be modulated by the rectangular wave voltage of the same period, and each component will be modulated twice by the phase modulator 6 to produce two identical phase changes, and then the modulated reflection component will have a time delay...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a phase-modulator half-wave voltage measuring system.The phase-modulator half-wave voltage measuring system comprises a polarization controller, a circulator, a polarization beam splitter, a first Faraday reflecting rotating mirror, a second Faraday reflecting rotating mirror, a third Faraday reflecting rotating mirror, a phase modulator, a driving power source, a polarization analyzer, a photoelectric converter and an oscilloscope.The circulator comprises three port; the polarization beam splitter comprises four ports; the output end of the polarization controller is connected with the port A of the circulator, the port B of the circulator is connected with the port A of the polarization beam splitter, the port B and the port D of the polarization beam splitter are connected with the first Faraday reflecting rotating mirror and the third Faraday reflecting rotating mirror respectively, the port C of the polarization beam splitter is connected with the input end of the phase modulator, the phase modulator is connected with the second Faraday reflecting rotating mirror, and the driving power source is connected with the control end of the phase modulator; the port C of the circulator is connected with the input end of the polarization analyzer, and the output end of the polarization analyzer is connected with the oscilloscope through the photoelectric converter.

Description

technical field [0001] The invention relates to the field of optical fiber circuit sensing, in particular to a phase modulator half-wave voltage measurement system and a measurement method. Background technique [0002] Phase modulators are widely used in optical communication, microwave photonics and other fields. The basic principle of electro-optic phase modulators is to use the photoelectric effect of crystals or anisotropic polymers, that is, to change the refractive index of crystals or anisotropic polymers by changing the applied voltage, thereby changing the phase of light waves. The half-wave voltage is one of the most important parameters of the phase modulator. It represents the amount of change in the bias voltage corresponding to the phase delay caused by the phase modulator when the phase delay is π. The half-wave voltage characterizes the modulation efficiency and modulation power consumption of the phase modulator. , largely determines the performance of the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R15/24
CPCG01R15/246G01R19/0084
Inventor 王金东陈文君苏华填王晓静江银珠魏正军张智明
Owner SOUTH CHINA NORMAL UNIVERSITY