Comparison between MZI and single phase modulator for generating 112 Gbit/s PDM-QPSK signal

We demonstrated the QPSK signal generated by a single phase-modulator (PM-QPSK) is more tolerant to nonlinearity than that generated by the Mach Zehnder Interferometer (MZI-QPSK). With simulation of WDM system at 28 Gsymbol/s per polarization the performance of PM-QPSK and MZI-QPSK are compared when dispersion management is used. After 800 km's transmission in single-polarization transmission system, MZI-QPSK outperforms PM-QPSK because of its better tolerance to ISI. After 400 km's transmission in polarization multiplexing system, PM-QPSK outperforms MZI-QPSK by comparing the symbol error ratio with optimized launch power, which is because PM-QPSK has better nonlinearity tolerance in dispersion managed system.

[1]  S. Bigo,et al.  Performance comparison of 40G and 100G coherent PDM-QPSK for upgrading dispersion managed legacy systems , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[2]  S. Bigo,et al.  Experimental analysis of 100Gb/s coherent PDM-QPSK long-haul transmission under constraints of typical terrestrial networks , 2008, 2008 34th European Conference on Optical Communication.

[3]  N. Kikuchi,et al.  Intersymbol Interference (ISI) Suppression Technique for Optical Binary and Multilevel Signal Generation , 2007, Journal of Lightwave Technology.

[4]  M.G. Taylor.  Coherent Detection for Optical Communications using Digital Signal Processing , 2007, OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference.

[5]  J Renaudier,et al.  Performance comparison of singly-polarized and polarization-multiplexed at 10Gbaud under nonlinear impairments , 2008, OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference.

[6]  R. Noe.  PLL-free synchronous QPSK polarization multiplex/diversity receiver concept with digital I&Q baseband processing , 2005, IEEE Photonics Technology Letters.

[8]  K. Kikuchi,et al.  Coherent demodulation of optical multilevel phase-shift-keying signals using homodyne detection and digital signal processing , 2006, IEEE Photonics Technology Letters.

[9]  Andrew J. Viterbi,et al.  Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission , 1983, IEEE Trans. Inf. Theory.

[10]  M. Premaratne,et al.  Effects of SPM, XPM, and four-wave-mixing in L-band EDFAs on fiber-optic signal transmission , 2000, IEEE Photonics Technology Letters.