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Pigtailing the high-Q microsphere cavity: a simple fiber coupler for optical whispering-gallery modes

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Abstract

We demonstrate a simple method for efficient coupling of standard single-mode optical fibers to a high-Q optical microsphere cavity. Phase-matched excitation of whispering-gallery modes is provided by an angle-polished fiber tip in which the core-guided wave undergoes total internal reflection. In the experimental setup, which included a microsphere with both an input and an output coupler, the total fiber-to-fiber transmission at resonance reached 23% (total insertion loss, 6.3 dB), with loaded quality factor Q3×107 and unloaded Q1.2×108 at 1550 nm. A simple pigtailing method for microspheres permits their wider use in fiber optics and photonics devices.

© 1999 Optical Society of America

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