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.
© 2006 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: April 20, 2006
Revised Manuscript: June 6, 2006
Manuscript Accepted: June 17, 2006
Published: August 9, 2006
Waleed S. Mohammed, Peter W. E. Smith, and Xijia Gu, "All-fiber multimode interference bandpass filter," Opt. Lett. 31, 2547-2549 (2006)