Abstract
In this paper, a novel
single-sideband differential phase-shift keying asynchronous carrier-suppressed
return-to-zero (SSB-DPSK-ACS-RZ) format is proposed for long-haul ultradense
wavelength-division multiplexing (UDWDM) systems with 43 Gbit/s/channel and
50 GHz of channel spacing. The time delay between the DPSK and clock signals
is optimized to achieve higher eye-opening and improved group velocity dispersion
tolerance. Furthermore, the tight SSB filtering performed by the multiplexer
is used to convert the DPSK-ACS-RZ signal from phase- to amplitude-shift keying,
allowing using a lower-cost direct-detection receiver and improving its spectral
efficiency. The single-channel and UDWDM transmission performance of the novel
format is numerically investigated and compared to the SSB duobinary carrier-suppressed
RZ, bandwidth-limited duobinary, phase-modulated duobinary transmission, and
bandwidth-limited DPSK formats. The SSB-DPSK-ACS-RZ format shows similar Q-factor
and tolerances to pre- and in-line dispersion compensations and fiber nonlinearity
to the ones of other investigated direct-detection formats. Significant total
residual dispersion tolerance improvement is achieved by the SSB-DPSK-ACS-RZ
format relative to the other formats due to the signal chirp. Moreover, the
SSB-DPSK-ACS-RZ format shows higher Q-factor than the one of the bandwidth-limited
DPSK for long-haul UDWDM transmission systems. In ultra-long-haul UDWDM transmission
systems, SSB-DPSK-ACS-RZ and bandwidth-limited DPSK formats show similar performance.
© 2009 IEEE
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