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Performance analysis of 3G-UMTS WDM-RoF links

Almeida C., Lima M., Teixeira A.

Optica Applicata

2010

Vol. 40, nr 4

773--789

In this paper, we analyze the impact of using directly modulated lasers and low cost optical amplifiers to propagate 3G-UMTS radio signals over fiber links. First, we perform a simulation study to identify the main impairments in such systems, and then complement the work with laboratory experiments in order to confirm the results and optimize our low cost radio over fiber system.

All-optical frequency down-conversion based on cross-phase modulation in high nonlinearity dispersion-shifted fiber for WDM radio over fiber application

Yang H., Sun J., Du Q.

Optica Applicata

2009

Vol. 39, nr 1

51--62

Simultaneous all-optical frequency down-conversion technique based on cross-phase modulation in a high nonlinearity dispersion-shifted fiber is proposed and verified by simulation, and its application to a wavelength-division-multiplexing (WDM) radio over fiber (ROF) is proposed. Error-free simultaneous all-optical frequency down-conversion of the 16 WDM ROF upstream channels is achieved. The simulated results show the performance of WDM signals is in good accordance with a single signal without any interference, and the power difference of two beat frequencies of the down-conversion signal is independent of the optical local oscillator power. The wavelength span of larger than 20 nm for down-conversion signal can be obtained.