Open AccessQuasi-distributed and wavelength selective addressing of optical micro-resonators based on long period fiber gratings
Author(s) -
Daniele Farnesi,
Francesco Chiavaioli,
Francesco Baldini,
Giancarlo C. Righini,
Silvia Soria,
Cosimo Trono,
Gualtiero Nunzi Conti
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.021175
Subject(s) - optics , materials science , resonator , whispering gallery wave , fiber , optical fiber , photonic crystal fiber , coupling (piping) , graded index fiber , dispersion shifted fiber , silica fiber , fiber optic sensor , wavelength , fiber bragg grating , long period fiber grating , polarization maintaining optical fiber , optoelectronics , fiber laser , physics , composite material , metallurgy
A novel all-in-fiber method for coupling light to high-Q silica whispering gallery mode (WGM) optical micro-resonators is presented, which is based on a pair of long period fiber gratings (LPGs) written in the same silica fiber, along with a thick fiber taper (15-18 μm in waist) in between the LPGs. The proposed coupling structure is robust and can be replicated many times along the same fiber simply cascading LPGs with different bands. Typical Q-factors of the order of 10(8) and total coupling efficiency up to 60% were measured collecting the resonances of microspheres or microbubbles at the fiber end. This approach uniquely allows quasi-distributed and wavelength selective addressing of different micro-resonators along the same fiber.
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