Title :
Constrained Coding for Quasi-Linear Optical Data Transmission Systems
Author :
Pechenkin, Vladimir ; Kschischang, Frank R.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont.
Abstract :
This paper considers the application of constrained coding to 40-Gb/s dispersion-managed single-channel optical communication systems limited by intrachannel four-wave mixing (IFWM). It is shown that when transmitted sequences obey the so-called (2, infin) constraint, runlength-limited codes can be designed to not only suppress ghost pulse formation but also improve the data rate by as much as 50% without increasing the transmission bandwidth. Since IFWM is a highly pattern-dependent effect, coding schemes with certain characteristics are preferable. Two different codes with simple encoding and decoding algorithms are constructed, and their performance is analyzed and compared to that of a realistic benchmark system. One of the codes turns out to be consistently better than the other due to its superior statistical properties. The qualitative conclusions are confirmed by numerical simulations. An extension of the method to multichannel links is also considered, and similar gain in data rate is demonstrated
Keywords :
encoding; multiwave mixing; optical fibre communication; optical fibre dispersion; telecommunication channels; constrained coding; decoding; dispersion-managed single-channel optical communication; encoding; intrachannel four-wave mixing; multichannel links; quasilinear optical data transmission; Bandwidth; Data communication; Decoding; Encoding; Four-wave mixing; Nonlinear optics; Optical fiber communication; Optical mixing; Optical pulses; Performance analysis; Constrained coding; fiber-optic communications; ghost pulses; intrachannel four-wave mixing (IFWM);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2006.884973
