Abstract
The use of incoherent multilevel modulation formats with high spectral
efficiency (more than two bits per symbol) has been proposed in order to enable
the next generation of very high-speed Time-Division Multiplexing Passive
Optical Networks (TDM-PONs). Incoherent multilevel modulation is attractive
for access applications since multilevel formats allow the scaling of the
bit rate with electronic and photonic components operating at a fraction of
the bit rate. On the other hand, incoherent detection reduces the requirement
for complicated Digital Signal Processing (DSP) and crucially an additional
local oscillator, compared to coherent receivers. The modulation formats examined
are Differential 8 Phase-Shift Keying (D8PSK) and three versions of incoherent
16 Quadrature Amplitude Modulation (QAM), specifically Star 16QAM, coded square
16QAM and 16QAM with pre-integration. Generation and detection of these formats
is discussed, as well as the implementation challenges associated with such
advanced modulation formats. The performance of these modulation formats was
evaluated through extensive simulation and experimental work. Results indicate
that incoherent modulation can fulfill important requirements of networks
operators, namely increased bit rate and increased splitting ratio, and provide
a cost-effective solution for Next-Generation Optical Access Networks.
© 2013 IEEE
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