Abstract
In this paper, we propose and experimentally verify a low-latency digital signal processing (DSP)-free
synchronous clock distribution and recovery scheme for high-speed dense wavelength division multiplexing orthogonal
frequency division multiple access (DWDM-OFDMA)-based mobile backhaul (MBH) systems. The synchronous clock
distribution is achieved jointly with high-speed OFDMA data signal transmission through a simple and low-cost
intensity-modulation direct-detection (IMDD) optical backhaul architecture that also guarantees clock time and
frequency stability. We experimentally verify aggregate 41.09-Gb/s (7λ × 5.87 Gb/s/λ) DWDM-OFDMA
data rates with distribution and recovery of 50-MHz square wave and 4-GHz sinusoid clocks over 40 km standard single
mode fiber (SSMF) with spectrally-efficient 25-GHz channel spacing and no remote optical amplification. To demonstrate
the flexibility of the proposed system, aggregate 51.31-Gb/s (7λ × 7.33 Gb/s/λ) DWDM-OFDMA
transmission with 50-MHz square wave and 5-GHz sine wave clocks is also experimentally evaluated. Highly precise time
and frequency accuracy is achieved, featuring an order of magnitude improvement with respect to LTE-Advanced (LTE-A)
synchronization requirements. By supporting high bit rates, high spectral efficiency, and low-latency synchronization,
the proposed approach is promising for future optical MBH.
© 2014 IEEE
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