Title :
Nonlinear crosstalk and compensation in QDPASK optical communication systems
Author :
Hansryd, Jonas ; Van Howe, James ; Xu, Chris
Author_Institution :
Sch. of Appl. & Eng. Phys., Cornell Univ., Ithaca, NY, USA
Abstract :
Nonlinear crosstalk in the quaternary differential-phase amplitude-shift-keying (QDPASK) modulation format is analyzed. Significant crosstalk penalty is measured on a QDPASK signal with a 20-Gb/s aggregate capacity for nonlinear phase shifts of 0.17π rad and above. Two different compensation techniques are demonstrated based on either prechirping or postchirping of the optical signal, increasing the nonlinear tolerance by 6.1 and 4.5 dB, respectively.
Keywords :
amplitude shift keying; chirp modulation; compensation; differential phase shift keying; optical crosstalk; optical fibre communication; optical modulation; phase modulation; quadrature phase shift keying; QDPASK; aggregate capacity; compensation; nonlinear crosstalk; nonlinear phase shifts; optical communication systems; optical signal; postchirping; prechirping; quaternary differential-phase amplitude-shift-keying; Aggregates; Amplitude shift keying; Differential quadrature phase shift keying; Nonlinear optics; Optical crosstalk; Optical fiber communication; Optical modulation; Optical receivers; Optical transmitters; Scanning probe microscopy;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.831282
