A novel fiber optical device based on microring resonators fabricated on side-polished fiber is proposed. The compact size and light weight device structure can be useful for various fiber-optic sensors, fixed and tunable wavelength filters, and intensity modulators. Since the device is directly fabricated on the optical fiber, many issues associated with fiber-to-chip coupling and attachment can be avoided. A preliminary experiment using polymer microring resonators made by two-photon polymerization has proved this new device concept.
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