Title :
Electric field characterization for phase-Modulated signals using measured spectrogram
Author :
Ho, Keang-Po ; Wang, Hsi-Cheng ; Chen, Hau-Kai ; Wu, Cheng-Chen
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
The complex-value electric field of a periodic phase-modulated optical signal is retrieved from the spectrogram/sonogram that is measured by a fast photodiode followed a tunable narrow-band optical filter. With an initial guess from the craters and ridges of the spectrogram, the numerical algorithm converges very fast to a mean-square error less than 1%.
Keywords :
differential phase shift keying; mean square error methods; optical filters; optical modulation; phase modulation; photodiodes; spectrometers; electric field characterization; phase-modulated signals; photodiode; sonogram; spectrogram; tunable narrow-band optical filter; Differential quadrature phase shift keying; Electric variables measurement; Fiber nonlinear optics; Nonlinear optics; Optical filters; Optical receivers; Optical sensors; Phase measurement; Pulse measurements; Spectrogram; Differential phase-shift keying (DPSK); phase retrieval; sonogram; spectrogram; time-resolved optical filtering (TROF);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.854420
