KEYWORDS: Optical amplifiers, Single mode fibers, Asynchronous transfer mode, Linear filtering, Interfaces, Ranging, Optical filters, Optical networks, Fiber to the x, Passive optical networks
This paper presents alternative architectures for high split and long range bidirectional single mode fiber (SMF) super passive optical networks (SuperPONs). The erbium doped fiber amplifier (EDFA) is introduced to enhance power budget. Three different alternative architectures are studied: 1) using transmission speed of 10 Gbit/s and 2.5 Gbit/s at same wavelength of 1550 nm; 2) using same transmission speed of 10 Gbit/s at wavelength of 1550 nm for downstream and 1530 nm for upstream; 3) using bidirectional EDFA at transmission speed of 10 Gbit/s and 2.5 Gbit/s with same wavelength of 1550 nm. The elaboration of architectures together with their advantages and disadvantages are included. The feasibility of deploying a SuperPON with 512 optical network units (ONUs) at transmission length of 100 km was observed from power budget studies.
Tin selenide thin films have been prepared onto glass substrates at a temperature 240 degrees Celsius and fixed film thickness by means of a solid state reaction process at pressure about 10-5 mbar. Low level antimony doping was maintained at a concentration 1.8%. The dark current- voltage measurements have been performed on the sandwiched structures of Al-SnSe-Al and Al-SnSe:Sb-Al at temperatures in the range 143 - 300 K, and the results showed a ln J varies direct as V1/2 dependence which was indicative of the Poole-Frenkel effect. It was found that, the calculated field-lowering coefficients, (beta) p for the latter samples (3.71 - 4.81 X 10-5 eV m1/2 V-1/2) were higher than the predicted value (2.18 X 10-5 eV m1/2 V-1/2) by a factor of 1.71 - 2.21. These were further confirmed by the linear dependence of the graphs's slope and inverse of temperature. The results were explained in terms of lowering potential barrier by the interaction of electron with applied electric field.
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