Abstract
Introducing controlled birefringence in air-silica microstructure fibers (ASMF) yields polarization-preserving characteristics which will become increasingly necessary for numerous applications.1–3 Indeed, birefringence has been previously introduced in a high-delta ASMF fabricated by Lucent Technologies to ensure polarization preservation during broadband super-continuum generation.4 To date, however, the polarization properties of this particular fiber have not been analyzed in detail, although ome evidence of birefringent phasematching in nonlinear propagation has been reported.5 Here, we describe experiment studying the polarization mode dispersion (PMD) of this fiber, presenting results in excellent agreement with calculations using a hexagonal structure with a slightly elliptical core. We also report the first observation of vectorial modulational instability (Ml) in ASMF with Ml sideband shifts in excellent agreement with predictions based on the calculated PMD.
© 2002 Optical Society of America
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