Ultra-broadband mode converters based on length-apodized long-period waveguide gratings

Wen Wang, Jieyun Wu, Kaixin Chen, Wei Jin, Kin Seng Chiang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

38 Citations (Scopus)


We propose an ultra-broadband mode converter based on the structure of a length-apodized long-period grating, where p-phase shifts are introduced at strategic locations of the grating profile. Using a 3-section length-apodized grating structure, we design and fabricate an LP01-LP11aand an LP01-LP11bmode converter with a sidewall grating and a surface grating formed along a polymer channel waveguide, respectively. The fabricated LP01-LP11aand LP01-LP11bmode converters provide a conversion efficiency higher than 99% over a bandwidth of ~120 nm and ~150 nm, respectively, or a conversion efficiency higher than 90% over a bandwidth of ~180 nm and ~300 nm, respectively. The transmission characteristics of these devices are weakly sensitive to polarization and temperature variations. These mode converters can find applications in ultra-broadband mode-division-multiplexing transmission systems based on few-mode fibers and the design principle can be applied to general grating-based mode-coupling devices for a wide range of applications.
Original languageEnglish
Pages (from-to)14341-14350
Number of pages10
JournalOptics Express
Issue number13
Publication statusPublished - 26 Jun 2017
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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