Title :
Optimization of Operating Conditions for 112-Gb/s Polarization-Multiplexed 16-QAM Optical Modulation
Author :
Chang, Sun Hyok ; Chung, Hwan Seok ; Kim, Kwangjoon
Author_Institution :
Opt. Internet Res. Dept., Electron. & Telecommun. Res. Inst., Daejeon, South Korea
fDate :
6/1/2011 12:00:00 AM
Abstract :
In this letter, we analyze a 16-ary quadrature amplitude modulation (16-QAM) optical signal generated by applying four-level electrical signals to a single in-phase/quadrature (IQ)-modulator. The amplitude of optical output of the Mach-Zehnder modulator (MZM) in the IQ-modulator needs to be carefully adjusted, and the limited extinction ratio of MZM results in unwanted phase offset. Required optical signal-to-noise ratio is estimated in the 112-Gb/s polarization-division-multiplexed (PDM) 16-QAM signal by numerical simulations with various amplitudes of the electrical modulation signals. Optimal operating conditions are found to guarantee the best performance of the received PDM 16-QAM signal.
Keywords :
multiplexing; optical communication equipment; optical modulation; quadrature amplitude modulation; 16-ary quadrature amplitude modulation; Mach-Zehnder modulator; bit rate 112 Gbit/s; optical signal; polarization division multiplexed 16-QAM signal; polarization multiplexed 16-QAM optical modulation; single in phase quadrature modulator; Optical modulation; Optical noise; Optical polarization; Optical receivers; Quadrature amplitude modulation; Signal to noise ratio; Optical fiber communication; optical modulation; polarization;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2132126
