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We demonstrate the sensing capability of a twisted multicore optical fiber with continuous grating enhanced back scatter. Our fiber allows spatially continuous temperature measurement in a sensor with more than 20dB round trip transmission loss.
Advances in hollow-core fibers employing Perturbed Resonance for Improved Single Modedness (PRISM) with higher-order mode suppression and polarization maintaining behavior are discussed.
High energy, 700 μJ, one nanosecond pulses and 490 femtosecond, 50 μJ pulses are demonstrated in an Er-doped, higher-order-mode fiber amplifier. An axicon at the output enables efficient, nonlinearity-free reconversion to a low M2 beam.
Combining a new semi-analytical step size estimation strategy with highly efficient quasi-spectral finite differences, a fast adaptive split-step solver for the nonlinear Schrodinger equation is presented. For large WDM systems, a substantial speed-up is obtained.
Using Pade approximations to the exponential function, an improved split-step method for the nonlinear Schrodinger equation is presented. For accurate simulations of large DWDM systems, substantial speed-up factors over the split-step Fourier method are obtained.
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