Abstract
We propose a new method to analyze the adiabaticity of a highly multimode tapered waveguide. The propagation of the optical beam in the multimode fiber taper is calculated using the Monte–Carlo ray tracing technique, and then the corresponding phase space of the optical beam is obtained. By calculating the phase space area, the etendue variation of the light is analyzed, and the quantitative criterion for evaluating the adiabaticity of the multimode fiber taper is given based on the etendue conservation principle.
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