Development of long-period fiber grating coupling devices

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

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Original languageEnglish
Pages (from-to)F61-F67
Journal / PublicationApplied Optics
Issue number25
Online published8 Jun 2009
Publication statusPublished - 1 Sep 2009


A long-period fiber grating (LPFG) formed in a single-mode fiber is considered as an effective device to tap light from the core of fiber. This light-tapping property of the LPFG allows a new class of wavelength- selective optical couplers to be realized by using the configuration of parallel LPFGs. Over the years a number of four-port and six-port LPFG couplers with peak coupling efficiencies greater than 80% have been demonstrated. To further increase the functionality of LPFG couplers and facilitate device packaging and integration, long-period grating couplers formed in planar waveguides have also been proposed, and the preliminary results are promising. A review of these coupling devices is presented.