Title :
K-Over-L Multidimensional Position Modulation
Author :
Eriksson, Tobias A. ; Johannisson, Pontus ; Puttnam, B.J. ; Agrell, Erik ; Andrekson, Peter A. ; Karlsson, Magnus
Author_Institution :
Dept. of Microtechnol. & Nanosci., Chalmers Univ. of Technol., Gothenburg, Sweden
Abstract :
We analyze a family of modulation formats based on multidimensional position modulation (MDPM) with multiple pulses per frame (K-over-L-MDPM) in combination with quadrature phase shift keying (QPSK), polarization multiplexed QPSK (PM-QPSK) and polarization-switched QPSK (PS-QPSK) for coherent communication systems. MDPM is a generalization of pulse position modulation where different pulse slots can be realized by time slots, polarization states, frequencies, modes of multimode fibers, cores in multicore fibers or a combination of these. We show that by using K-over-L-MDPM with QPSK, it is possible to simultaneously increase both the spectral efficiency and the asymptotic power efficiency over QPSK. We also identify K-ary inverse-MDPM (KiMDPM-QPSK) as the special case of K-over-(K - 1)-MDPM and show that 4iMDPM-QPSK has a 1.25 dB increased asymptotic power efficiency over QPSK with a maintained spectral efficiency.
Keywords :
multiplexing; optical fibre communication; optical fibre polarisation; optical modulation; quadrature phase shift keying; 4iMDPM-QPSK; K-ary inverse-MDPM; K-over-L multidimensional position modulation; K-over-L-MDPM; KiMDPM-QPSK; PM-QPSK; PS-QPSK; asymptotic power efficiency; coherent communication systems; modulation formats; multicore fiber core; multimode fiber modes; polarization multiplexed QPSK; polarization states; polarization-switched QPSK; pulse position modulation; pulse slots; quadrature phase shift keying; spectral efficiency; time slots; Crosstalk; Frequency shift keying; Multicore processing; Phase shift keying; Sensitivity; Digital modulation; multi-pulse position modulation (MPPM); multicore fiber; multidimensional position modulation (MDPM); optical fiber communication; polarization-switched quadrature phase shift keying (PS-QPSK); power efficiency; pulse position modulation (PPM); quadrature phase shift keying (QPSK); sensitivity; spectral efficiency;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2322117