Open AccessA Novel Noise-Insensitive Chromatic Dispersion Estimation Method Based on Fractional Fourier Transform of LFM Signals
Author(s) -
Wanli Wang,
Yaojun Qiao,
Aiying Yang,
Peng Guo
Publication year - 2017
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2016.2647207
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
We propose a novel chromatic dispersion (CD) estimation method by fractional Fourier transformation of linear-frequency modulation (LFM) signals. This method can measure inband and outband CD without using extra spectrum or timeslot resources. In our method, LFM signals are added on quadrature phase-shift keying (QPSK) and 16 quadrature amplitude modulation (16-QAM) signals with different center frequency offsets. The average estimation error of CD estimation is 0.234%, 0.25%, and 0.41% when the center frequency offset is 0, 15, and 40 GHz after five, 10, 15, and 20 spans standard single-mode fiber transmission. The results demonstrates that the maximum estimation error is always below 80 ps/nm for accumulated CD less than 24 000 ps/nm. For all scenarios, the CD estimation performance barely drops with optical signal-to-noise ratio from 10 to 25 dB and launch power from 0 to 6 dBm of five channel transmission.