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We demonstrate the fabrication of long-period fiber gratings written in six-mode fiber by CO2-laser pulses as a mode converter to realize the mode conversion from LP01 mode to LP11 mode, LP21 mode and LP02 mode successfully with efficiencies of more than 90%, respectively.
We demonstrated the fabrication of long period fiber gratings written in two-mode fiber as mode converter to realize the mode conversion between LP01 mode and LP11 mode with an efficiency of up to 99.9%.
We present a coupled-mode analysis of a six-port coupler consisting of three parallel uniform long-period fiber gratings, where a longitudinal offset distance may be introduced between the gratings. In particular, we discuss the effects of the grating coupling coefficient and the evanescent-field coupling between the parallel fibers on the performance of the coupler. Our theoretical results compare...
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