Abstract
An optical fiber interferometer formed when the unused output of a fiber Mach-Zehnder interferometer is fed back through a length of fiber to the unused input port is discussed. For sensor applications, the resulting optical circuit combines many features of a Mach-Zehnder with the high measured sensitivity of a resonant fiber recirculating delay line. This analysis shows that suitable choice of path lengths preserves high measurand sensitivity, yet it permits complete common-mode compensation in which the effects of all perturbations which uniformly affect the interferometer vanish.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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