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In this paper, a new kind of high power microwave directional coupler operating at 1.72GHz to 2.61GHz is presented. To get a directional coupler with very weak coupling but high power capacity, a two-stage coupling strategy is proposed. Multi-holes coupling structure is used for the first coupling stage, and double cross-aperture is used for the second coupling stage. The coupling factor's variation...
In this paper, we present a cognitive routing and wavelength assignment (RWA) algorithm for dynamic optical networks, named CRWA algorithm. Different from the traditional RWA algorithm, a cognitive model derived from the Case-Based Reasoning (CBR) is introduced into the proposed algorithm to reduce computing complexity. Simulation results show that the computational time of CRWA is reduced about 25%...
Algorithms of frequency offset (FO) estimation based on fast Fourier transform of the sample signal's argument have been investigated, in which the FO estimation range is ( is the symbol rate). In this letter, an improved algorithm is proposed with the sign of FO being determined by means of an improved judging method. The estimation range of the proposed algorithm can be...
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