Influence of laser chirp on the performance of 40Gbit/s optically compensated directly modulated systems
Influence of laser chirp on the performance of 40Gbit/s optically compensated directly modulated systems, Proc International Conf. on Transparent Networks – ICTON , São Miguel, Portugal, Vol. 1, pp. 1 - 5, June, 2009.
Digital Object Identifier:
The influence of laser chirp on the performance of 40 Gbit/s directly-modulated (DM) long-haul systems (LHS)
using optimised optically pre-compensated dispersion maps (OPDM) are assessed through numerical simulation.
It is shown that, for a laser chirp parameter of 3.5, the interplay of high laser chirp with linear and nonlinear fiber
effects leads to signal distortion that prevents the efficient use of 40 Gbit/s/ DM-LHS. However, a reduced laser
chirp parameter of 1.5 allows a strong improvement of signal transmission, foreseeing the possibility of using
DM-LHS with OPDM. In addition, it is also shown that the right balancing between the laser's transient and
adiabatic chirps plays a decisive role in order to attain the best performance of DM-LHS using OPDM.
Keywords: directly modulated systems, optimised dispersion maps, pre-compensated systems.