Mr. John-Peter van Zelm Profile

John-Peter van Zelm

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Proceedings Article | 19 August 2003 Paper

Pure harmonic upconversion in radio-on-fiber systems

John-Peter van Zelm, Robert Davies

Proceedings Volume 5247, (2003) https://doi.org/10.1117/12.510745

KEYWORDS: Upconversion, Modulation, Distortion, Phase shift keying, Signal detection, Dispersion, Modulators, Radio optics, Radio over Fiber, Optical modulators

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The demand for residential broadband connectivity is growing world-wide, spurring on research efforts to solve the 'last mile' problem. Radio-on-fiber (ROF) based networks are an attractive solution as they offer significant infrastructure cost savings and economically leverage existing optical infrastructure. This network topology would necessarily operate in the 30GHz, LMCS band (Local Multi-User Communication system) by virtue of its broadband requirements. Such high operating frequencies and bandwidths demand expensive RF hardware. Pure harmonic upconversion of the radio subcarrier is an attractive method of reducing the frequency requirements of the system oscillator, mixer, and optical modulator with minimal complexity, thus reducing infrastructure costs. Unfortunately, severe phase and amplitude distortion results from the harmonic upconversion process and is further compounded by chromatic dispersion. This paper characterizes these distortions, and introduces a mitigating phase and amplitude predistortion scheme for harmonic upconversion with chromatic dispersion in Mach-Zehnder/direct detection based optical links. As a proof of concept, a prototype Mach-Zehnder based, 3rd order harmonically upconverted 10.41GHz, 16QAM subcarrier radio-on-fiber system is described, and preliminary experimental results presented.

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