This paper describes the fabrication and analysis of novel twin cored fiber which contains a transparent and silver halide doped photochromic core in same cladding. The Photochromic core fibers were fabricated in twin cored structure by rode and tube method. The diameter of photochromic core and transparent core is around 15 m. The distance between two cores is 1.5m. The transparent core was used to guide the probe beam and photochromic core was excited by UV source. The interaction of the probe beam with the excited photochromic core showed the photochromic behavior of the fiber.
A simple optical technique is described for the measurement of complex mode amplitudes in multimode fibers. The
technique used in this experiment involves launching a laser beam into the core of low moded optical fiber, exciting a
mixture of normal modes. The emerging mode patterns are stored in microcomputer. The complex modes are then
extracted from these recoded intensities with help of modified version of Gerchberg-Saxton algorithm. Many
experimental results are recorded in photographic form and comparison with computer analyzed pattern is made. The
evaluation of complex mode amplitudes in multimode fiber can yield useful information about the mode filling of such
fiber.
The ever increasing demand of the bandwidth has been efficiently fulfilled by the advent of Wavelength Division Multiplexing (WDM), which efficiently utilizes the available bandwidth of fiber links. The performance of these networks can be drastically improved by using efficient message scheduling and/or sequencing algorithm(s), to reduce the delay experienced by the packets and also to distribute the load among the available channels, to get maximum channel utilization. In this research we modeled protocols, which can improve network performance, as each of them may perform better in different operating circumstances. Several conditions were studied and performance of these algorithms has been compared, using our modeling tools. Most of the schemes proposed earlier ignored some parameters (e.g. tuning times of the transmitters and the receivers) or had some unrealistic assumptions, which will be discussed later in the paper. We tried to simulate more realistic scenarios. The parameters, which are monitored during the simulations, are average delay, throughput and channel utilization by changing the values of packet generation rate, number of available channels, transmitter and receiver tuning times. To verify the simulations we also developed a math model without making any unrealistic assumptions. Extensive simulations were conducted and a detailed study of the protocols is made possible.
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