Abstract
We investigate theoretically the combined effect of fiber chromatic
dispersion and self-phase modulation (SPM) on multi-channel subcarrier multiplexed
(SCM) optical transmission systems in terms of the detected RF carrier power and
SPM-induced power gain after transmission over single-mode fiber (SMF) links.
According to the calculated power gain due to the SPM effect at the transmission
distance of P3dB using the detected radio-frequency (RF) carrier power after
photo-detection, the power gain is significantly degraded with large optical
modulation index (OMI), small SCM channel spacing, and large fiber launching power
because of the increased interaction between subcarrier channels. The nonlinear
phase shift due to linear and nonlinear fiber characteristics is investigated to
explain these results in detail. The numerical simulation results show that the OMI
per SCM channel has to be smaller than 10 % for the fiber launching power of 10 dBm
to guarantee prevention of SPM-induced power gain degradation below 0.5 dB for the
SCM system with the channel spacing of 100 MHz. This result is expected to be
utilized for the optical transmission systems using the SCM technology in future
radio-over-fiber (RoF) networks.
© 2011 Optical Society of Korea
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