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Experimental evaluation of prefiltering for 56 Gbaud DP-QPSK signal transmission in 75 GHz WDM grid

Authors
Journal
Optical Fiber Technology
1068-5200
Publisher
Elsevier
Volume
20
Issue
1
Identifiers
DOI: 10.1016/j.yofte.2013.11.006
Keywords
  • Optical Prefiltering
  • Optical Modulation
  • Quaternary Phase Shift Keying
  • Coherent Detection
  • Optical Transmission
  • Wavelength Division Multiplexing

Abstract

Abstract We investigate optical prefiltering for 56Gbaud (224Gbit/s) electrical time-division multiplexed (ETDM) dual polarization (DP) quaternary phase shift keying (QPSK) transmission. Different transmitter-side optical filter shapes are tested and their bandwidths are varied. Comparison of studied filter shapes shows an advantage of a pre-emphasis filter. Subsequently, we perform a fiber transmission of the 56Gbaud DP QPSK signal filtered with the 65GHz pre-emphasis filter to fit the 75GHz transmission grid. Bit error rate (BER) of the signal remains below forward error correction (FEC) limit after 300km of fiber propagation.

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