Realization of alignment-tolerant grating couplers for z-cut thin-film lithium niobate

Arunita Kar, Meisam Bahadori, Songbin Gong, Lynford L Goddard

Research output: Contribution to journalArticle

Abstract

We present the design, modeling, fabrication, and characterization of grating coupler devices for z-cut lithium niobate near 1550 nm. We first experimentally measure the sensitivity of the insertion loss of a conventional grating coupler to translational misalignment through a three-factor full factorial design of experiment. Next, we design grating couplers that are significantly less sensitive to misalignment. The fabricated devices experienced less than 7 dB of excess insertion loss for combined misalignments of up to ± 5 μm in plane and up to -2 μm or + 10 μm out of plane.

Original languageEnglish (US)
Pages (from-to)15856-15867
Number of pages12
JournalOptics Express
Volume27
Issue number11
DOIs
StatePublished - Jan 1 2019

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lithium niobates
misalignment
couplers
alignment
gratings
insertion loss
thin films
factorial design
experiment design
fabrication
sensitivity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Realization of alignment-tolerant grating couplers for z-cut thin-film lithium niobate. / Kar, Arunita; Bahadori, Meisam; Gong, Songbin; Goddard, Lynford L.

In: Optics Express, Vol. 27, No. 11, 01.01.2019, p. 15856-15867.

Research output: Contribution to journalArticle

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