Abstract
We propose and demonstrate subcarrier multiplexing (SCM) based self-heterodyne (SH) coherent detection for polarization-multiplexed 16 quadrature amplitude modulation (PM-16QAM) format. Three closely spaced subcarriers carrying pilot-tone (PT) and two 16QAM signals, respectively, are generated via subcarrier modulation technique. An effective digital signal processing (DSP) scheme is proposed to eliminate image frequency interference (IFI) arising in such SH coherent detection. Meanwhile, a closed-form analytical BER formula is verified by numerical simulations with a deviation less than 0.3dB at BER=10−3. The concept of optimum modulation index (MI) ratio between data and PT signal is derived and verified, in order to reduce the distortion of 16QAM constellation. Meanwhile, we also explore the effects of optical filter bandwidth and subcarrier frequency spacing on the quality of PT signal. Finally, we are able to obtain several optimum parameters for the proposed SH coherent detection.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
