In the last two decades, fiber-optic communication and photonic integrated circuits have been popularized rapidly. However, the dimension difference between optical fiber devices and photonic chips makes the design of fiber-to-chip couplers challenging. To solve this problem, several coupling strategies have been proposed, such as inverted taper-based structures, grating couplers and meta-material based couplers. In this paper, the simulation result of several metamaterial-based couplers for a quantum fiber-optic communication system are demonstrated. Simulation results show that these coupler has 60% focusing efficiency at the 1550nm wavelength with its mode field diameter less than 3um.
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