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Hexagonally stacked all-glass multi-core leakage-channel fibers consisting of seven fused silica cores of up to 100 mum in diameter were fabricated. Simultaneous fundamental mode propagation in all cores and their active coherent combination was demonstrated.
We demonstrate a rapidly scanning all-fiber Fourier transform spectrometer based on a temporal scanning all-optical delay line constructed with two mode-locked 1-GHz Yb fiber lasers. An effective mirror scan rate of 7.5 km/s is achieved.
We have demonstrated both theoretically and experimentally strong suppression of coupling of the guided fundamental mode into cladding modes in a Bragg grating by introducing a depressed cladding around the core region. We have also studied the effect for different depression depths.
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