Gradient-index optical fiber lens for efficient fiber-to-chip coupling | Zendy

Henrik Melkonyan | Zendy; Kenaish Al Qubaisi | Zendy; Karen Sloyan | Zendy; Anatol Khilo | Zendy; Marcus S. Dahlem | Zendy

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Gradient-index optical fiber lens for efficient fiber-to-chip coupling

Author(s) -

Henrik Melkonyan,

Kenaish Al Qubaisi,

Karen Sloyan,

Anatol Khilo,

Marcus S. Dahlem

Publication year - 2017

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.25.013035

Subject(s) - materials science , optics , graded index fiber , lens (geology) , mode volume , optical fiber , refractive index , single mode optical fiber , fiber , plastic optical fiber , polarization maintaining optical fiber , dispersion shifted fiber , photonic crystal fiber , gradient index optics , fiber optic sensor , optoelectronics , wavelength , physics , composite material

A gradient-index optical fiber lens is proposed and fabricated on the tip of a single-mode fiber using focused ion beam milling. Second-order effective medium theory is used to design a gradual change in the fill factor, which ensures a parabolic effective refractive index distribution. The proposed fiber lens design is simulated via the three-dimensional finite-difference time-domain method, and demonstrated through confocal optical measurements. At a wavelength of 1550 nm, the fabricated lenses focus a 10.4 μm mode field diameter exiting the fiber into spot sizes between 3-5 μm, located 4-6 μm away from the fiber tip. Direct coupling into a silicon-on-insulator chip is also demonstrated, where the fabricated gradient-index lens has a coupling efficiency comparable to a commercial lensed fiber.

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