title: All-fiber multimode interference bandpass filter.
abstract: A novel design for an all-fiber bandpass filter based on a multimode interference reimaging phenomenon is presented. The filter has achieved low insertion loss with adequate bandwidth and isolation for coarse wavelength-division multiplexing. The filter can easily be made with any central wavelength that is compatible with the single-mode fiber used for its construction. The measured filter performance matches the theoretical predictions well. The filter can have broad applications in fiber-optic telecommunications, spectroscopy, and sensing.
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Waleed S
authors.initials: WS
authors.lastname: Mohammed
authors.forename: Peter W E
authors.initials: PW
authors.lastname: Smith
authors.forename: Xijia
authors.initials: X
authors.lastname: Gu