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Risultati sfruttabili
PHOTOS exploits the new and significant technology represented by fibre grating components, written directly into photosensitive optical fibres by ultraviolet (UV) exposure, to achieve practical and advanced functionalities in wavelength division multiplexing (WDM) and time division multiplexing (TDM) systems. The work concerns the development of key fibre components for future photonic networks which can be advantageously realised with photosensitive grating technology, assessment of their system performances by supplying them for test to a set of system-oriented projects, and analysis of the network impact of this technology.
The basic material studies have provided new insights into the fundamental mechanisms, including stability, and important data for device design and implementation. Several fibre types have been realised and supplied for DFB fibre laser, bandpass filter, and optical add/drop multiplexer (OADM) realisation. Grating characterisation has been addressed with the development of fast OLCR technique, and tunability issues have been assessed. Significant results have been obtained on all classes of devices. Packaging work was also carried out on devices, supported by climatic tests, with analysis and derivation of related temperature compensation schemes. For the passive scheme, considerable development of the adhesive system, and the exact design of these packages, has now produced temperature sensitivity reduced to around 0.2 nm/100 C. It has also been shown that an active stabilization technique can provide a uniform control of larger structures, such as long chromatic dispersion compensators. Initial functional system characterization has provided first levels of assessment and feedback to designers on device performance. System modelling work has provided a useful tool for device optimization; particular benefit has been derived in grating apodisation for chromatic dispersion compensator design.
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