Title :
25-Gb/s OFDM 60-GHz Radio Over Fiber System Based on a Gain Switched Laser
Author :
Martin, Eamonn P. ; Tong Shao ; Vujicic, Vidak ; Anandarajah, Prince M. ; Browning, Colm ; Llorente, Roberto ; Barry, Liam P.
Author_Institution :
Opt. Commun. Lab., Dublin City Univ., Dublin, Ireland
Abstract :
A 25-Gb/s OFDM 60-GHz radio over fiber (RoF) transmission system employing a gain switched DFB laser for millimeter-wave generation is demonstrated. Transmission performance below the 7% FEC limit is achieved over 50 km of fiber initially by employing precompensation. This precompensation overcomes phase noise caused by the optical phase decorrelation induced by chromatic dispersion on the two optical channels separated by 60 GHz. An externally injected gain switched laser is subsequently employed to eradicate the need for the precompensation, thus reducing phase noise and increasing the tolerance to the induced time delay between the optical tones. Transmission performance below the 7% limit is achieved over 25 km of fiber with 2-m wireless transmission in this case.
Keywords :
OFDM modulation; decorrelation; fibre lasers; millimetre wave lasers; optical modulation; optical switches; radio-over-fibre; FEC limit; OFDM radio-over-fiber transmission system; bit rate 25 Gbit/s; chromatic dispersion; externally injected gain switched laser; frequency 60 GHz; gain switched DFB laser; induced time delay; millimeter-wave generation; optical channels; optical phase decorrelation; optical tones; phase noise reduction; precompensation; wireless transmission; Laser noise; OFDM; Optical fibers; Optical noise; Phase noise; Semiconductor lasers; Gain-switching; gain-switching; optical comb source; orthogonal frequency division multiplexing; phase noise; radio over fibre (RoF);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2015.2391994
