Title :
Data-Aided OSNR Estimation for QPSK and 16-QAM Coherent Optical System
Author :
Do, Cuong T. ; Tran, A.V. ; Zhu, C. ; Hewitt, D. ; Skafidas, E.
Author_Institution :
Dept. of Electr. & Electron. Eng., Univ. of Melbourne, Parkville, VIC, Australia
Abstract :
We propose an optical signal-to-noise ratio (OSNR) estimation technique using self-equalized complementary Golay sequences for both QPSK and 16-QAM coherent optical systems. The training sequences have complementary spectra, which enable accurate channel estimation and equalization, and have length-independent constellation for high-performance estimation. Estimation performances are verified through 100- and 40-Gb/s QPSK and 200- and 80-Gb/s 16-QAM coherent polarization-multiplexed optical systems, with an accuracy of 0.4 and 0.7 dB, in both simulations and experiments, respectively.
Keywords :
channel estimation; equalisers; multiplexing; optical modulation; quadrature amplitude modulation; quadrature phase shift keying; sequences; 16-QAM coherent optical system; QPSK; bit rate 100 Gbit/s; bit rate 200 Gbit/s; bit rate 40 Gbit/s; bit rate 80 Gbit/s; channel estimation; equalization; polarization multiplexed optical systems; quadrature amplitude modulation; quadrature phase shift keying; self-equalized complementary Golay sequences; Channel estimation; Estimation; Optical filters; Optical noise; Signal to noise ratio; Training; Golay sequences; Optical signal to noise ratio; QAM; QPSK; coherent system; data-aided;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2013.2280536
