Abstract

Direct-detection passive networks with optical amplifiers and tunable filters provide sensitivity and selectivity comparable to those of coherent systems and are simpler and more field worthy.1-3 Tunable fiber Fabry–Perot (FFP) filters4 and erbium-doped fiber amplifiers (EDFA’s) offer excellent optical performance and basic compatibility with single-mode optical fibers. This paper describes a tunable fiber FFP filter5 with passive temperature compensation as well as the control circuitry and design detail necessary for its initial application in an IBM research prototype wavelength-division multiple-access (WDMA) computer network called Rainbow.2

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