High-frequency narrow-band single-mode fiber-optic transversal filters

Abstract

A cascade synthesis procedure for constructing high frequency narrow-band (or high quality factor) single-mode optical fiber transversal filters using <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">j \times j (j \geq 2)</tex> bidirectional couplers is reported. Design and analysis of the cascade filters are described. Experimental results of many fabricated cascade filters with tap numbers up to 256 and the first-order passband frequencies up to 3.25 GHz are consistent with the mathematical analysis.