Phase noise-tolerant synchronous QPSK/BPSK baseband-type intradyne receiver concept with feedforward carrier recovery

By Reinhold Noé. Journal of Lightwave Technology, 2005

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1-Tb/s Single-Channel Coherent Optical OFDM Transmission With Orthogonal-Band Multiplexing and Subwavelength Bandwidth Access (2010, background): “CO-OFDM serves as an interesting alternative to the coherent single-carrier system for long-haul transmission [14]–[18].”
Evaluation of Sensitivity of the Digital Coherent Receiver (2008, methodology): “The carrier phase noise is estimated after homodyne detection by means of digital signal processing (DSP) [6] and the -ary PSK signal is restored in a very stable manner [4].”
Feedforward Carrier Recovery for Coherent Optical Communications (2007, background): “The I and Q of the transmitted polarizations may then be recovered by a complex-valued matrix multiplication [16].”
Hardware-Efficient Coherent Digital Receiver Concept With Feedforward Carrier Recovery for $M$ -QAM Constellations (2009, methodology): “One option is to use two separate carrier recoveries for each polarization, or to have a common carrier recovery for both polarizations as proposed in [19].”
Recent advances in coherent optical communication (2009, methodology): “The equal-tap-weight filter can also be implemented by using gliding window filtering [ 18 ].”