Title :
Feed-Forward Linearised Uncooled DFB Laser in a Multi-Channel Broadband Wireless over Fibre Transmission at 5.8 GHz
Author :
Ismail, T. ; Liu, C.P. ; Mitchell, J.E. ; Seeds, A.J.
Author_Institution :
Department of Electronic and Electrical Engineering, University College London, Torrington Place, London, WC1E 7JE, United Kingdom
Abstract :
We present the first experimental demonstration of a feed-forward linearised uncooled laser at 5.8 GHz in a wireless-over-fibre system for the transmission of multi-channel broadband 16 QAM and 64 QAM signals over 2.2 km of single mode fibre intended for wireless LAN applications. We demonstrate that with such a linearisation scheme, a reduction of 20 dB is achieved in the spectral re-growth caused by a strong adjacent channel. Significant reduction in the error vector magnitude and improved constellation and eye-diagrams were observed. Intermodulation distortion is reduced by 13 dB when two strong channels are at +10 dBm input level.
Keywords :
Feed-Forward systems; Intermodulation distortion; Optical communication; Radio-over-Fibre; Uncooled laser; Costs; Feedforward systems; Fiber lasers; Laser modes; Laser noise; Optical distortion; Optical fibers; Quadrature amplitude modulation; Radio frequency; Wireless LAN; Feed-Forward systems; Intermodulation distortion; Optical communication; Radio-over-Fibre; Uncooled laser;
Conference_Titel :
Microwave Photonics, 2005. MWP 2005. International Topical Meeting on
Print_ISBN :
89-950043-3-9
DOI :
10.1109/MWP.2005.203553
