Abstract

This paper provides detailed descriptions of the interplay between dispersion and chirp (specifically adiabatic chirp), in an optical orthogonal frequency-division multiplexing (OFDM) transmission system based on a directly modulated DFB laser (DML). We experimentally investigated various amounts of dispersion and adiabatic chirp by, respectively, varying the length of the fiber (0–150 km) and the bias current of the laser. By implementing DSP-based compensation for nonlinear distortion while taking adiabatic chirp into account, we determined that adiabatic chirp dominates nonlinear distortion after dispersive transmission. Adiabatic chirp was also shown to mediate dispersion-induced power fading and even provide a power gain. This is an indication that a specific amount of adiabatic chirp may be beneficial to transmission performance, particularly when the nonlinear distortion is mitigated by DSP-based compensation. The proposed adiabatic-chirp-related nonlinear compensation scheme enables an improvement of up to 11 Gbps in maximum capacity, and the presence of adiabatic-chirp-related gain makes it possible to achieve higher capacities following dispersive transmission.

© 2018 IEEE

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