Ultra-high-resolution OTDR based on Linear Optical Sampling with Digital Dispersion Compensation

2016 ◽  
Author(s):  
Shuai Wang ◽  
Xinyu Fan ◽  
Qingwen Liu ◽  
Zuyuan He
Keyword(s):  
High Resolution ◽  
Dispersion Compensation ◽  
Optical Sampling ◽  
Linear Optical

A Method of Dispersion Compensation Based on Warped Frequency Transform

2013 ◽  
Vol 718-720 ◽  
pp. 2062-2067 ◽  
Author(s):  
Shang Chen Fu ◽  
Zhen Jian Lv ◽  
Ding Ma ◽  
Li Hua Shi
Keyword(s):  
High Resolution ◽  
Velocity Dispersion ◽  
Lamb Waves ◽  
Group Velocity Dispersion ◽  
Dispersion Compensation ◽  
Imaging Method ◽  
Finite Element Software ◽  
Damage Imaging ◽  
Resolution Imaging ◽  
Multi Mode

The use of Lamb waves for structural health monitoring (SHM) has complicated by its multi-mode character and dispersion effect, which impacts the damage positioning and high-resolution imaging. The group velocity dispersion curves of Lamb waves can be employed to warp the frequency axis, and then to establish warped frequency transform (WFT) to process Lamb waves. In this paper, received signals are directly compensated with warped frequency transform to suppress dispersion, and a new imaging method is proposed based on warped frequency transform. The propagation of Lamb waves in damaged aluminum plate is simulated by finite element software ABAQUS, results show that warped frequency transform can effectively compensate dispersive wave-packets, and high-resolution damage imaging can be obtained by the proposed method.

Optimization of Linear Optical Sampling Analog Front-End and Test for 128 Gb/s Signals

2016 ◽  
Vol 36 (2) ◽  
pp. 0206002 ◽  
Author(s):  
黄炎 Huang Yan ◽  
付松年 Fu Songnian ◽  
刘彬 Liu Bin ◽  
柯昌剑 Ke Changjian ◽  
刘德明 Liu Deming
Keyword(s):  
Optical Sampling ◽  
Front End ◽  
Analog Front End ◽  
Linear Optical
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