Subset-Optimized Polarization-Multiplexed PSK for Fiber-Optic Communications
Journal article, 2013

A more power-efficient modulation format than polarization-multiplexed quadrature phase-shift keying (PM-QPSK) can be obtained by optimizing the amplitude ratio between symbols with odd and even parity in the PM-QPSK constellation. The optimal amplitude ratio approaches the golden ratio at high signal-to-noise ratio (SNR), yielding a 0.44 dB increase in asymptotic power efficiency compared to PM-QPSK. Union bound expressions are derived for the bit and symbol error rate of the new format, which together with Monte Carlo simulations give the power efficiency at both low and high SNR. A similar optimization performed on PM-8PSK gains 1.25 dB.


four-dimensional modulation


quadrature phase-shift keying


Martin E Sjödin

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Erik Agrell

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Magnus Karlsson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

IEEE Communications Letters

1089-7798 (ISSN)

Vol. 17 5 838-840 6476943

Subject Categories

Nano Technology

Other Electrical Engineering, Electronic Engineering, Information Engineering



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