Solution of the light propagation model and applied implementation at optical mobile fibreless networks for indoors requires knowledge of the light behaviour at reflection. Except knowledge of the static directional characteristics of the reflected lights the knowledge of the dynamic behaviour is significant as well. Wall surfaces in precincts are furnished with paints containing colouring substances. Their metastable levels implicate time delay at reflections. By reason that typical life time in metastable states is about 10-3-10-6s it happens at bit rates above 1Mbit.s-1 to SNR influencing. Functional effect is the growth of bit error rate. The principal problem of the dynamic reflectance is that due to time delay on the pigments metastable levels the reflected light will influence far from bit interval that is a source of light for reflectance but within some of the resulting bit periods. Each surface with paints has a typical directional light distribution and in paper Fourier spectra for mostly used walls are presented.
Photonic crystal fibers technology provides us with new way to obtain fibers with much higher non-linearity than
conventional techniques. Upper limits of non-linear coefficients obtainable in silica-based photonic crystal fibers have
been already investigated. Unique dispersion characteristic and enhanced non-linearity make this kind of fibers an ideal
candidate for non-linear optical devices in telecommunication applications, for measurement and sensing and for
supercontinuum generation. However, there are limitations given by material properties, which obstruct us from
achieving theoretical limits of these fibers. Extremely small core and high air-filling fraction are here needed for reach
higher non-linearity, so when material properties of conventional silica restrict us, there is a requirement on a novel
matter. This could be poly-methyl metacrylate (PMMA), a common material for plastic optical fibers manufacturing.
These microstructured polymer optical fibers are a recent technology, which gives us with new possibilities in core size,
fiber geometry and related air-filling fraction. By this kind of fiber, we could be closer to ideal non-linear fiber, which is
core strain surrounded by air, than even before. But new kind of fiber brings new issues, like which effect in fiber will be
dominant or how will be coupled light affected by outer influences - and what difference will be between predicted and
real values in general. This is a large task and hopefully, there will be answer at least for a small part in this paper.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.