Abstract
AbstractIn this article, we propose and demonstrate an orthogonal frequency division multiplexing‐radio over fiber (OFDM‐ROF) system based on three channels sextupling‐frequency scheme using an external modulation of a distributed feedback laser diode (DFB‐LD) and dual drive Mach–Zehnder modulator (DD‐MZM) for carrying 100 GHz W‐band frequency multiple‐input multiple‐output (MIMO)‐OFDM signals with 90 Gbps downstream. MIMO‐OFDM algorithms effectively compensate for impairments in the wireless link. Without using costly W‐band components, a transmission system with 50 km single mode fiber (SMF) and 4 m wireless transmission operation at 100 GHz is experimentally validated. The power penalties for MIMO‐OFDM signals of base stations are less than 3 dBm. For the upstream transmission, wavelength reuse with 30 Gbps 4QAM upstream signals is experimentally demonstrated. The minimum optical spectral gap between residue downstream OFDM band and upstream OFDM band that guarantees a tolerable amount of optical interference has been determined through experiment. The frequency of local oscillator is reduced due to frequency sextupling scheme. The cost of the proposed system is largely reduced. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:93–99, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27251
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