Due to low attenuation in third transmission windows, single mode fibers are the most popular medium, also, in supporting transfer of optical power to various devices. For this reason ability to achieve the maximum of optical power is still actual. There are two different ways to estimate the optical power in the fiber core. The first is analysis of mathematical model in the aim of getting the best wavelength guaranteeing maximum of optical power. Second way is approximation of distribution of optical power along radius without changes of wavelength and with constant attenuation coefficient. In this paper the second way of evaluation was chosen, where distribution of optical power in single-mode fiber is approximated by Hermite or Legendre polynomials.
VoIP is a fast-developing technology which allows making telephone calls using a data network like the Internet. VoIP converts the voice signal from the telephone into a digital signal that travels over the Internet and then converts it back at the other end so that speaking to anyone with a regular phone number is possible. VoIP may also enable the direct calls from a computer with the use of a conventional telephone or a microphone. Some services using VoIP may only allow you to call other people using the same VoIP service, but others may allow you to call anyone who has a telephone number. First condition is a broadband Internet connection for VoIP technology to work. There are two major advantages of VOIP: lower cost and increased functionality. In the paper the integration of two networks, one with a CCME based installation and the other with a full Asterisk/SIP voicemail deployment is presented. The goal was to allow dialing between VoIP's telephony from different networks and evaluate a quality of connection with the use of certain codecs.
The advantages of all-optical network's technics make them one of main elements of the metropolitan area networks. They enable different applications in high quality mulitimedia services and guarantee a constant and reliable access to the Internet. As the growing expansion of the Internet continues in an unpredictable direction, many new solutions are expected. The major challenge is the increasing demand for flexible, transparent and customised bandwidth services for both private and business customers.
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