Enhancing alignment tolerance of silicon waveguide by using a wide grating coupler

Optics Express
Jong-Moo LeeGyungock Kim

Abstract

We fabricate a 20 um wide grating coupler for a single-mode thermally-expanded-core (TEC) fiber, in order to enhance positional tolerance in alignment. The minimal coupling loss is measured at 5 dB per facet and the optical 3 dB bandwidth is measured at 40 nm. The 3 dB alignment tolerance is measured at +-7.5 microm in horizontal direction and +290 microm in vertical direction. The 1 dB alignment tolerance is measured at +-4.2 microm in horizontal direction and +125 microm in vertical direction. The alignment tolerance is enhanced twice in horizontal direction and four times in vertical direction, compared with the coupling of a standard single-mode fiber to a standard 10 microm wide grating coupler which is also fabricated in this experiment.

References

Dec 21, 2004·Optics Letters·Dirk TaillaertRoel Baets
Nov 27, 2006·Optics Express·Günther RoelkensRoel Baets
Mar 1, 2005·IEEE Photonics Technology Letters : a Publication of the IEEE Laser and Electro-optics Society·W Y OhB E Bouma

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Citations

Jan 1, 2021·Optics Express·Mohamed A EttabibJames S Wilkinson

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