Title :
Half-cycle modulation for VCSEL based 6-Gbaud 4-QAM transmission over 1 km multimode fibre link
Author :
Pham, T.T. ; Rodes, Roberto ; Estaran, Jose ; Jensen, J.B. ; Monroy, I.T.
Author_Institution :
Dept. of Photonics Eng., Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
A subcarrier multiplexing system with the subcarrier frequency at half the baud rate to improve the spectral efficiency is demonstrated. A 12 Gbit/s 4-QAM signal in 9GHz bandwidth was successfully transmitted over a 1 km OM4 MMF 850 nm VCSEL without any equalisation method. The 1.5 dB power penalty was improved compared to an OOK signal at the same data rate.
Keywords :
optical fibre communication; optical links; optical modulation; quadrature amplitude modulation; subcarrier multiplexing; surface emitting lasers; OM4 MMF VCSEL; OOK signal; VCSEL; bandwidth 9 GHz; bit rate 12 Gbit/s; bit rate 6 Gbit/s; distance 1 km; four-QAM transmission; half-cycle modulation; multimode fibre link; power penalty; spectral efficiency; subcarrier frequency; subcarrier multiplexing system; wavelength 850 nm;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.2256
