Ultra-Broadband Mode Filter Based on Phase-Shifted Long-Period Grating

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

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Original languageEnglish
Article number8717989
Pages (from-to)1052-1055
Journal / PublicationIEEE Photonics Technology Letters
Issue number13
Online published17 May 2019
Publication statusPublished - 1 Jul 2019


We propose an ultra-broadband mode filter based on the structure of a phase-shifted long-period grating formed along a few-mode waveguide terminated with two linear tapers. To demonstrate the operation principle, we design a mode filter to reject the fundamental mode of a three-mode waveguide that supports the E11, E21, and E12 modes. Our typical experimental device fabricated with polymer material, which has a length of 26 mm, provides polarization-insensitive 10-dB rejection of the E11 mode against the E21 and E12 modes with bandwidths of ∼190nm (1440-1630 nm) and ∼140nm (1450-1590 nm), respectively. The proposed mode filter could serve as a general platform for the development of mode filters and mode-dependent-loss compensators for mode-division-multiplexing applications.

Research Area(s)

  • gratings, Integrated optics devices, optical polymer, optical waveguide components