In this paper, the ability of Bragg fiber array to guide optical mode is investigated theoretically. Simulation shows that Bragg fiber array can be looked as a good waveguide to guide inter-fiber modes, which are supported by the external reflection of the 1-D photonic crystal claddings of the Bragg fibers. The mechanism of leakage loss of the inter-fiber is analyzed, showing that the TM01-like mode has the lowest leakage loss and less than 1dB/m leakage loss can be achieve under the wavelength of 10.6μm. As an open waveguide or 2-D microcavity, the Bragg fiber array has wide potential applications including processes of interaction between light and atoms or molecules.
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