Multimode-fiber-based edge filter for optical wavelength measurement application and its design

A novel all-fiber edge filter for optical wavelength measurement application is proposed. The filter sandwiches a multimode fiber (MMF) section with all optimally designed length between two single-mode fibers and utilizes the multimode interference in the MMF section. A measurable wavelength range of more than 50 nm is obtained with a desired spectral location through optimally choosing the length of the MMF section. (c) 2006 Wiley Periodicals. Inc.