Abstract

We report on an optical fiber Mach–Zehnder interferometer made by offset splicing a dual-mode fiber with two single-mode fibers. The extinction ratio can be tuned from less than 1dB to greater than 28dB by rotating the dual-mode fiber along its axial direction. The interferometer is utilized as a pulse shaper to convert a 2.5ps Gaussian pulse to a 5.2ps flat-top pulse.

© 2011 Optical Society of America

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