Yatindra Nath Singh

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In this paper, effectiveness of semiconductor optical amplifiers (SOA's) in tree-net in terms of increase in the number of users has been investigated. In the analysis, SOA's with i) unsaturated gain, ii) average gain saturation, and iii) average gain saturation with gain fluctuations have been considered. Further, the results for the tree-net are compared(More)
Cognitive Radio Networks (CRN) have enabled us to efficiently reuse the underutilized radio spectrum. The MAC protocol in CRN defines the spectrum usage by sharing the channels efficiently among users. In this paper we propose a novel TDMA based MAC protocol with dynamically allocated slots. Most of the MAC protocols proposed in the literature employ Common(More)
This paper develops both exact and approximate models for the analysis of an all-optical packet switch based on a fiber-loop buffer memory (FLBM). The switch structure and operation is based on the fully shared buffer architecture of the Research and Development in Advanced Communications in Europe—ATM Optical Switching (RACE-ATMOS) project [1], which uses(More)
P-Cycles are one of the most promising techniques used for span protection in optical networks. However when p-cycle is used to provide protection to any failed span, there may be overlapping of some nodes in the working path and in the restoration path provided by the p-cycle. These nodes are repeated in the restored path, hence redundant link capacity is(More)
This paper describe a general scheme to design all the uni-polar codes characterized by parameter (n, w). The binary sequence of length ‘n’ (‘n’ bits) and weight ‘w’ (number of bit ‘1’s in the sequence) with its n-1 circular shifted versions represent the same code. These codes can be further put in(More)
We consider WDM networks with lightpath switching where wavelengths may be converted, as required, along the lightpath. For efficient converter usage in such a network, sparse converter placement may be followed where only some of the network nodes are equipped with wavelength converters. Given the nominal network traffic pattern, we present a simple(More)