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 journalArticlepeer-review


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
Issue number11
StatePublished - 2019

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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