We consider a single wavelength channel in a nonlinear dispersive single-mode fiber. We simulate the propagation of binary sequences using ON-OFF keying return-to-zero modulation at a bit rate of 10 Gb/s, under different dispersion and input power conditions. We determine the impact that dispersion and nonlinearity have on the pulse sequences by measuring the Euclidian distances (EDs) among all pairs of received sequences. We then model the set of EDs as a fully connected graph and by means of a clique-finding algorithm we search for subsets of sequences that form codes matched to this nonlinear channel, resulting in significant bit-error-rate improvement.
Bibliographical noteFunding Information:
Manuscript received March 11, 2004; revised July 27, 2004. This work was supported in part by AFOSR under Contract Number F49620-01-1-0363. J. A. Anguita is with the Electrical and Computer Engineering Department, University of Arizona, Tucson, AZ 85721 USA (e-mail: janguita@ ece.arizona.edu). M. A. Neifeld is with the Electrical and Computer Engineering Department, and the Optical Sciences Center, University of Arizona, Tucson, AZ 85721 USA (e-mail: firstname.lastname@example.org). Digital Object Identifier 10.1109/LPT.2004.836754
- Dispersive nonlinear fiber
- Fiber-optic communications
- Forward error correction
- Nonlinear codes