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Optimization of Operating Conditions for 112-Gb/s Polarization-Multiplexed 16-QAM Optical Modulation
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- Authors
- Sun Hyok Chang, Hwan Seok Chung, Kwangjoon Kim
- Issue Date
- 2011-06
- Citation
- IEEE Photonics Technology Letters, v.23, no.11, pp.724-726
- ISSN
- 1041-1135
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- 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 MachZehnder 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. © 2011 IEEE.
- KSP Keywords
- 16-ary quadrature amplitude modulation(16QAM), Best performance, Electrical modulation, Electrical signal, Extinction Ratio(ER), IQ modulator, In-phase, Mach-Zehnder(MZ), Numerical simulation(Trnsys16), Operating condition, Optical modulation