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The accuracy of staircase-approximation techniques that are used for analyzing optical fiber properties depends on how certain discretization parameters are chosen. In this work we discuss and develop criteria for the choice of those parameters. Particular emphasis is placed on a physics-based criterion we suggest be followed for the specijkation of the refractive index of the layers into which the fiber core is discretized. 0 1993 John Wiley & Sons. lnc. using coplanar waveguide open circuit stubs for the capacitive element.ss. is investigated. Passband ripple within 1.5 d B and a stopband rejection of more than 45 d B is achieved. Comparison of the predicted and experimentally measured results is presented and the agreement is good. 0 1993 John Wiley d Sons, Inc. ABSTRACT A five-element Chebyshev low-pass filter having high roll off, built

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