Abstract
The radio over fiber (RoF)–distributed antenna system (DAS) over a wavelength division
multiplexing-passive optical network (WDM-PON) with multiple input multiple output (MIMO) employing bandpass-sampling
and optical time division multiplexing (TDM) techniques has been proposed to realize next generation broadband
wireless access with higher throughput and its preliminary feasibility has been confirmed. To investigate the
performance of bandpass-sampled and time domain multiplexed optical signals, and enhance the transmission performance
in the wireless link of the RoF-DAS over WDM-PON, we perform two-tone signal transmission experiments with
2.4 GHz band radio frequency (RF) signals and analyze the RF carrier power, third-order intermodulation
distortion (IMD) power and noise power. The analysis results confirmed that the nonlinearity of the proposed system is
mainly caused by a lithium niobate-Mach–Zehnder modulator (LN-MZM) as with the other RoF systems and that the
dominant noise components are the signal–spontaneous beat noise arising from the amplified spontaneous emission
(ASE) of two erbium doped fiber amplifiers (EDFAs) and the signal–signal beat noise caused by the interference
between the optical TDM pulses. The latter is the specific noise component in the proposed system. In addition, we
clarify the principle of the signal–signal beat noise generation and report that the signal–spontaneous
beat noise can be reduced by the gain optimization of the two EDFAs.
© 2013 IEEE
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