Giovanni Tartarini

Avoided-crossing-based liquid-crystal photonic-bandgap notch filter

We demonstrate a highly tunable deep notch filter realized in a liquid-crystal photonic-bandgap (LCPBG) fiber. The filter is realized without inducing a long-period grating in the fiber but simply by filling a solid-core photonic-crystal fiber with a liquid crystal and exploiting avoided crossings within the bandgap of the LCPBG fiber. The filter is demonstrated experimentally and investigated using numerical simulations. A high degree of tuning of the spectral position of the deep notch is also demonstrated.

Transmission of UMTS and WIMAX Signals Over Cost-Effective Radio Over Fiber Systems

A comprehensive theoretical and experimental investigation is presented on the performances of cost-effective radio over fiber (RoF) links where the RoF Transmitter is directly modulated by signals complying the Universal Mobile Telecommunications Service (UMTS) and Worldwide Interoperability for Microwave Access (WiMAX) standards. A numerical model for calculating intermodulation related quantities like the adjacent channel leakage ratio has been developed for this purpose. Measurements have also been performed over real RoF Systems modulated by UMTS and WiMAX signals. A very good agreement has been found between measured and modelled results, and the feasibility of these connections over distances of tens of kilometers has been investigated.

Distortion Performance Prediction in Multi-Band Radio over Fiber Systems Exploiting Direct Laser Modulation

An efficient numerical tool has been developed for radio over fiber (RoF) link performance evaluation. Successful comparisons have been made between modeled and measured quantities in RoF links intended for wireless signal distribution

Tunable Bandpass Filter based on Photonic Crystal Fiber filled with Multiple Liquid Crystals

A tunable bandpass filter based on a photonic crystal fiber filled with two different liquid crystals is demonstrated. 130 nm bandwidth tunability is achieved by tuning the temperature from 30degC to 90degC.

Liquid crystal photonic bandgap fiber components

Liquid crystal photonic bandgap fibers represent a promising platform for the design of all-in-fiber optical devices, which show a high degree of tunability and exhibit novel optical properties for the manipulation of guided light. In this review paper we present tunable fiber devices for spectral filtering, such as Gaussian filters and notch filters, and devices for polarization control and analysis, such as birefringence control devices and switchable and rotatable polarizers.

Intermodulation Distortion Modelling in IM-DD Multi-Band Radio over Fibre Links

Efficient numerical tools have been developed for Radio over Fiber (RoF) link performance evaluation. Successful comparisons have been made between modeled and measured quantities in RoF links intended for wireless signal distribution