Time filter

Source Type

Xiao Y.,Jilin University | Guo J.,Jilin University | Wu K.,Jilin University | Dong W.,Jilin University | And 4 more authors.
Optics Express | Year: 2013

We numerically investigate the operational principle and performance of stimulated Brillouin scattering based multiple microwave frequency signals measurement. The unknown signals are processed specially to generate a gain region which is measured by phase modulation to amplitude modulation converting. By sweeping the vector network analyzer, both single and multiple frequencies measurement can be achieved. The loss spectrum generated by one of the pumps is fully compensated by the gain spectrum of the other pump, which increases the measurement range from 2VB to 4VB. ©2013 Optical Society of America. © 2013 Optical Society of America. Source

Xiao Y.,Jilin University | Guo J.,Jilin University | Wu K.,Jilin University | Qu P.,Chongqing Optoelectronics Research Institute | And 5 more authors.
Optics Express | Year: 2013

A single passband microwave photonic filter with ultrawide tunable range based on stimulated Brillouin scattering is theoretically analyzed. Combining the gain and loss spectrums, tuning range with 44GHz is obtained without crosstalk by introducing two pumps. Adding more pumps, Tuning range multiplying with the multiplication factor equaling to the total quantity of pump can be achieved, which has potential application in microwave and millimeter wave wireless communication systems. © 2013 Optical Society of America. Source

Tian Z.,Chongqing Optoelectronics Research Institute
Bandaoti Guangdian/Semiconductor Optoelectronics | Year: 2013

Parameters related with displacement measurement using laser speckle were analyzed and computer simulations were carried out on the point-by-point redisplay of double-exposure exposure specklegram of various average speckle size. The results show that, high contrast interference fringes can be obtained when the same specklegram overlays with the distance of 1 to 6 times of the same average size, and is redisplayed with the laser beam at the diffraction distance metting Fresnel approximation. Source

Zeng R.,Tsinghua University | Yu J.,Tsinghua University | Wang B.,Tsinghua University | Niu B.,Tsinghua University | Hua Y.,Chongqing Optoelectronics Research Institute
Measurement: Journal of the International Measurement Confederation | Year: 2014

Intense E-field measurement is widely applied in high voltage and dielectric insulation research. In this paper, an integrated optical E-field sensor for time-domain measurement has been studied comprehensively, which is based on Mach-Zehnder interferometer with a mono-shielding electrode. Firstly, the principle and the key issues of the sensor design are presented. Secondly, the time-domain response characteristics are studied and the sensor can well follow waveforms with a rise time from nano-second to micro-second. Thirdly, the temperature stability of the sensor is analyzed, and the influence of temperature is quantified. Finally, the measurement of gas discharge field by the developed sensor is introduced, showing that the time-domain transient field measurement is an effective criterion for streamer inception. © 2014 Elsevier Ltd. All rights reserved. Source

Li G.,Chongqing Optoelectronics Research Institute
Bandaoti Guangdian/Semiconductor Optoelectronics | Year: 2010

For integrated optical intensity modulator based on M-Z optical waveguide and electro-optic effect of LiNbO3, its working principles and structures are presented and the indexes effecting its performance are discussed. An optimization of the design of a traveling-wave LiNbO3 interference modulators is discussed. Source

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