Performance of PM QPSK and PM 16-QAM coherent optical fiber communication systems

Abstract

The performance of polarization multiplexed, quadrature phase shift keying (PM QPSK) and polarization multiplexed 16-ary quadrature amplitude modulation (PM 16-QAM) is considered with an emphasis on the signal processing algorithms that compensate transmission impairments and implement key receiver functions.

Single-Carrier 448 Gb/s Dual-Polarization 16-QAM Transmission over 1200 km Using Fixed Look-Up Table Based MAP Detection

“…The off-line signal processing was the same as in [7] except that a sliding-window two-stage simplified QPSK partitioning and QPSK constellation transformation algorithm [8] was used for the carrier phase recovery and the LUT-based MAP detection was implemented before the direct bit error counting.…”