Title :
Equalization & carrier recovery for 112Gbps optical coherent system with HEX-16-QAM modulation
Author :
Adib, Md Mosaddek Hossain ; Khalil, Md Ibrahim ; Chowdhury, Arshad M. ; Faruk, Md Saifuddin ; Gee-Kung Chang
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., North South Univ., Dhaka, Bangladesh
Abstract :
We propose and demonstrate a new 112 Gbps Polarization division Multiplexing digital optical coherent systems with hexagonal 16-QAM (HEX-16-QAM) modulation. In our proposed system we use decision directed dispersion compensation algorithm which is Least Mean Square (LMS) algorithm and single tap decision directed carrier recovery algorithm. We compare the HEX-16-QAM systems with 16-QAM system for uncompensated transmission. Our analysis result found that HEX-16-QAM can achieve bit error rate (BER) of 1.5×10-4 whereas square 16-QAM BER is 5×10-4 for uncompensated 500-km transmission at 25 dB OSNR. Propose system achieve 0.3 dB OSNR penalty with compare to square 16-QAM system.
Keywords :
compensation; equalisers; least mean squares methods; optical communication; optical dispersion; optical modulation; quadrature amplitude modulation; BER; HEX-16-QAM modulation; LMS algorithm; OSNR penalty; bit error rate; bit rate 112 Gbit/s; carrier recovery; decision directed dispersion compensation algorithm; distance 500 km; equalization; hexagonal 16-QAM modulation; least mean square algorithm; polarization division multiplexing digital optical coherent systems; uncompensated transmission; Bit error rate; Finite impulse response filters; Modulation; Optical fiber polarization; Optical noise; Optical polarization; Signal to noise ratio; 16-QAM; Coherent; Digital Equalization; HEX-16-QAM; LMS;
Conference_Titel :
Electrical & Computer Engineering (ICECE), 2012 7th International Conference on
Conference_Location :
Dhaka
Print_ISBN :
978-1-4673-1434-3
DOI :
10.1109/ICECE.2012.6471611
