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A novel Mach-Zehnder interferometer (MZl) based on a pair of long period fiber gratings (LPGs) in an embedded-core hollow optical fiber (ECOF) are proposed and demonstrated experimentally. Two similar LPGs with peak attenuation of approximately 3dB are fabricated in an ECOF by using high-frequency CO2 laser to form an in-fiber MZI. The dependences of the resonant peak on the temperature and the axial...
A linear five-core fiber was sandwiched in between two single-mode fibers to construct an all-fiber Mach–Zehnder interferometer (MZI). The linear five-core fiber can support multiple supermodes due to a small distance between two adjacent cores. The interferences between the fundamental supermodes, between the fundamental supermodes and the high-order core modes, and between the fundamental supermodes...
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