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We present a class of fibers that exploit light propagation in higher-order modes, and hence decouple the dispersion-versus-mode-area trade-off encountered in conventional fibers. This enables exploiting the multitude of nonlinear optical effects afforded by fibers, at energy levels potentially approaching those of tunable solid-state lasers.
We demonstrate long-period gratings whose attenuation can be changed by 25 dB in a 48-nm spectral band, with ambient index changes of only 2.7/spl times/10/sup -4/. This is achieved by inducing coupling to ultra sensitive cladding modes in engineered fiber waveguides.
We demonstrate a tunable polarisation-dependent-loss compensator using a novel LPG-device, The PDL can be tuned continuously from 0 to 20 dB over a 10-nm bandwidth. The device enables practical implementation of PDL management in systems
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