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Improved Lidar system based on optical bandpass filter
Author(s): Yan Zhang; YaXu Wang; RongZhu Zhang
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Paper Abstract

The difference between the initial wavelength of the output signal caused by the error during the tunable laser tuning process will lead to the decrease of the azimuth resolution of the synthetic aperture lidar. In order to reduce the initial wavelength error, a scheme of filtering using a cascaded micro-ring M-Z optical band-pass filter is proposed. Using the digital filter design method by cascade micro-loop assisted M-Z interferometer to achieve elliptic filter. The 24-order elliptic filter is used to realize the filter with the transition band of 0.001nm, the passband ripple of 1dB and the stopband ripple of 60dB. The use of digital filter design cascaded micro-ring M-Z interferometer optical filter, not only to achieve the desired results, but also can improve the design efficiency of optical filters. After the optimization of the parameters of the cascaded microring M-Z filter, a filter with a large bandwidth, a flat top and a very small transition band can be obtained. Used to control the initial wavelength error can achieve the desired effect.

Paper Details

Date Published: 12 December 2018
PDF: 7 pages
Proc. SPIE 10846, Optical Sensing and Imaging Technologies and Applications, 108462A (12 December 2018); doi: 10.1117/12.2505411
Show Author Affiliations
Yan Zhang, Guiyang Univ. (China)
YaXu Wang, Sichuan Univ. (China)
RongZhu Zhang, Sichuan Univ. (China)

Published in SPIE Proceedings Vol. 10846:
Optical Sensing and Imaging Technologies and Applications
Mircea Guina; Haimei Gong; Jin Lu; Dong Liu, Editor(s)

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