TY - JOUR
T1 - Direct digital predistortion technique for the compensation of laser chirp and fiber dispersion in long haul radio over fiber links
AU - Hadi, Muhammad Usman
AU - Nanni, Jacopo
AU - Polleux, Jean Luc
AU - Traverso, Pier Andrea
AU - Tartarini, Giovanni
PY - 2019/6/1
Y1 - 2019/6/1
N2 - Analog Radio-over-Fiber (A-RoF) communication technology constitutes a promising technique for next generation radio access networks thanks to its relatively low bandwidth requirements. Within this context, an efficient predistortion technique is proposed, which can be applied to reduce the impairments of A-RoF systems due to the combined effects of frequency chirp of the laser source and chromatic dispersion of the optical channel. The radio frequency signal is firstly put in digital form through an analog to digital converter, then the predistortion operation is realized, and finally the resulting signal is put again into analog form. A comprehensive analysis on the theoretical basis of the proposed approach is presented, together with the approximations introduced, which makes it practically realizable. The improvements on the quality of the received signal due to the proposed solution are illustrated with reference to scenarios of applicative interest. The performance of proposed technique is evaluated in terms of adjacent channel leakage ratio and error vector magnitude when long term evolution signal is applied at the input.
AB - Analog Radio-over-Fiber (A-RoF) communication technology constitutes a promising technique for next generation radio access networks thanks to its relatively low bandwidth requirements. Within this context, an efficient predistortion technique is proposed, which can be applied to reduce the impairments of A-RoF systems due to the combined effects of frequency chirp of the laser source and chromatic dispersion of the optical channel. The radio frequency signal is firstly put in digital form through an analog to digital converter, then the predistortion operation is realized, and finally the resulting signal is put again into analog form. A comprehensive analysis on the theoretical basis of the proposed approach is presented, together with the approximations introduced, which makes it practically realizable. The improvements on the quality of the received signal due to the proposed solution are illustrated with reference to scenarios of applicative interest. The performance of proposed technique is evaluated in terms of adjacent channel leakage ratio and error vector magnitude when long term evolution signal is applied at the input.
KW - Adjacent channel leakage ratio
KW - Directly modulated laser
KW - Error vector magnitude
KW - LTE signals
KW - Predistortion
KW - Radio-over-Fiber
UR - http://www.scopus.com/inward/record.url?scp=85067304707&partnerID=8YFLogxK
U2 - 10.1007/s11082-019-1923-8
DO - 10.1007/s11082-019-1923-8
M3 - Journal article
AN - SCOPUS:85067304707
SN - 0306-8919
VL - 51
JO - Optical and Quantum Electronics
JF - Optical and Quantum Electronics
IS - 6
M1 - 205
ER -