Temperature-insensitive mode converters with CO2-laser written long-period fiber gratings

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Article number7047784
Pages (from-to)1006-1009
Journal / PublicationIEEE Photonics Technology Letters
Issue number9
Online published24 Feb 2015
Publication statusPublished - 1 May 2015


We fabricate mode converters by directly writing long-period gratings in a two-mode fiber with a CO2 laser. These mode converters allow the fundamental LP01 mode to be converted to any of the four higher order cylindrical vector modes or the LP11 modes. The transmission characteristics of these devices are insensitive to temperature variations and the mode conversion efficiency is insensitive to the polarization state of the input light. One of our typical gratings, which contains 15 grating periods, can provide a conversion efficiency >99% over a bandwidth of 34.0 nm in the C-band. These robust mode converters could find applications in mode-division-multiplexing systems and other applications that require cylindrical vector modes.

Research Area(s)

  • cylindrical vector mode, Long-period fiber grating, mode converter, mode-division multiplexing