Abstract
Multiband (MB) orthogonal frequency-division multiplexing (OFDM) ultra-wideband
(UWB) wireless, which provides high data rate access, is required to be distributed
by using optical fiber. The performance of MB-OFDM UWB over fiber transmission
system is investigated considering optical modulation and demodulation impact.
Theoretical analysis of the effect of fiber dispersion, optical transmitter,
and optical receiver response on system performance is carried out considering
amplitude and phase distortion. Experiments are conducted and verified by
our theoretical analysis and good agreement is obtained. It is found that
RF modulation index of $\sim
{\hbox {4}}\%$ is optimum for optical transmitter with Mach–Zehnder
modulator, and optical receiver with Chebyshev-II response is the best for
MB-OFDM UWB over fiber. Compared to back-to-back UWB over fiber, optical transmission
is mainly limited by laser phase noise converted relative intensity noise
and phase distortion induced by fiber dispersion when optimum modulation index
is used. Higher modulation index is limited by amplitude and phase distortion
to OFDM signal induced by optical transmitter and receiver response nonlinearities
and fiber dispersion and the spectral mask. It is also found that highly received
optical power is required for transmission of MB-OFDM UWB signal over fiber.
© 2009 IEEE
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