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A novel all‐fiber edge filter for optical wavelength measurement application is proposed. The filter sandwiches a multimode fiber (MMF) section with an 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.
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Wang et al. (2006) studied this question.
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