Article

480-Mbps, Bi-Directional, Ultra-Wideband Radio-Over-Fiber Transmission Using a 1308/1564-nm Reflective Electro-Absorption Transducer and Commercially Available VCSELs

Univ. of Essex, Colchester
Journal of Lightwave Technology (impact factor: 2.78). 03/2009; DOI:10.1109/JLT.2008.2005644 pp.266 - 272
Source: IEEE Xplore

ABSTRACT We describe 480 Mbps, bi-directional ultra-wideband (UWB) radio signal transmission over 1 km of single-mode optical fiber. Key components are a highly linear, reflective electro absorption transducer (EAT) and commercially available 1308-nm and 1564-nm VCSELs with 4.8-GHz bandwidth. Detailed EAT and 1308-nm VCSEL distortion analyses and measurements are presented highlighting the low intermodulation and harmonic distortion necessary for typical -18-dB wireless channel error vector magnitudes (EVMs). Direct VCSEL modulation with Wimedia supported band group 1 (3.1-4.8 GHz) MB-OFDM UWB signals was modelled with VPItransmissionMaker, suggesting a minimum EVM of -18.733 dB at 0.4502 OMI. This was confirmed by 480 Mbps upstream and downstream EVM measurements over fiber of -21.4 dB or better. Fully functional, half-duplex, bi-directional data transfer was achieved with interlocked RF switches.

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Keywords

1308-nm VCSEL distortion analyses
 
4.8-GHz bandwidth
 
480 Mbps upstream
 
bi-directional data transfer
 
Direct VCSEL modulation
 
EVMs
 
fiber
 
harmonic distortion necessary
 
highlighting
 
interlocked RF switches
 
linear
 
low intermodulation
 
minimum EVM
 
single-mode optical fiber
 
typical -18-dB wireless channel error vector magnitudes
 

M.P. Thakur