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 $1\mathrm{dB}$ to greater than $28\mathrm{dB}$ by rotating the dual-mode fiber along its axial direction. The interferometer is utilized as a pulse shaper to convert a $2.5\mathrm{ps}$ Gaussian pulse to a $5.2\mathrm{ps}$ flat-top pulse.

© 2011 Optical Society of America

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