Abstract
The optimization of the single-sideband (SSB) duobinary carrier-suppressed (DCS) return-to-zero (RZ) format
for long-haul ultradense wavelength-division multiplexing (UDWDM) systems with a 43-Gb/s/channel and a channel
spacing of 50 GHz is investigated numerically. It is shown that the optimized SSB-DCS-RZ format with an electrical
transmitter bandwidth of 0.35 of the bit rate has about 1 dB of Q-factor improvement relative to the conventional SSB-DCS-RZ format (an electrical transmitter bandwidth of
0.25 of the bit rate) due to the reduction of noise bandwidth, smaller linear crosstalk, and better tolerance to the
intra-channel fiber nonlinear effects. No substantially different UDWDM system performance is observed when varying
the duty cycle of the DCS-RZ signal with optimized SSB filters settings. The UDWDM transmission performance of
SSB-DCS-RZ formats is compared with the bandwidth-limited (BL)-duobinary formats. It is shown that generally, the
SSB-DCS-RZ formats have poorer Q-factor and tolerance to the
total residual dispersion but much higher tolerance to the in-line dispersion compensation and intra-channel
nonlinear effects than the BL-duobinary formats.
© 2007 IEEE
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