Digital coherent detection of multi-gigabit 16-QAM signals at 40 GHz carrier frequency using photonic downconversion

We experimentally demonstrate detection of multi-gigab it 16-QAM modulated signals, of up to 4 Gb/s at a 40 GHz carrier frequency by combining photonic downconversion and low bandwidth electronics We experimentally demonstrate detection of multi-gigabit 16-QAM modulated signals, of up to 4 Gb/s, at a 40 GHz carrier frequency by combining photonic downconversion and low bandwidth electronics

Radio-frequency transparent demodulation for broadband hybrid wireless-optical links

A novel demodulation technique which is transparent to radio-frequency (RF) carrier frequency is presented and experimentally demonstrated for multigigabit wireless signals. The presented demodulation technique employs optical single-sideband filtering, coherent detection, and baseband digital signal processing. Multigigabit wireless signal demodulation of 1.25-Gbaud quadrature phase-shift-keying modulated data at 40- and 35-GHz RF carrier frequency is experimentally demonstrated using the proposed demodulation scheme

Optical Modulation Format Recognition in Stokes Space for Digital Coherent Receivers

\u3cp\u3eWe report on a novel method for optical modulation format recognition based on Stokes parameters and variational expectation maximization algorithm. Discrimination among six different pol-muxed coherent modulation formats is successfully demonstrated in simulation and experiment.OFC/NFOEC Technical Digest\u3c/p\u3