Direct measurement of group delay with joint time-frequency analysis of a white-light spectral interferogram.
We propose and demonstrate an analysis method to directly extract the group delay rather than the phase from the white-light spectral interferogram. By the joint time-frequency analysis technique, group delay is directly read from the ridge of wavelet transform, and group-delay dispersion is easily obtained by additional differentiation. The technique shows reasonable potential for the characterization of ultra-broadband chirped mirrors.
Deng
Yuqiang
Y
Institute of Quantum Electronics, State Key Laboratory of Advanced Optical Communication System and Networks, School of Electronics Engineering and Computer Science, University of Beijing, Beijing 100871, China. yqdeng@nim.ac.cn
Yang
Weijian
W
Zhou
Chun
C
Wang
Xi
X
Tao
Jun
J
Kong
Weipeng
W
Zhang
Zhigang
Z