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Tunable mode converter using electromagnet-induced long-period grating in two-mode fiber
Affiliation:1. Shibaura institute of Technology, Toyosu 3-7-5, Koto-ku, Tokyo 135-8548, Japan;2. Awaji Materia, Kanda ogawacho 2-3-13, Chiyoda-ku, Tokyo 101-0045, Japan;3. Seikow Chemical Engineering & Machinery Ltd., Mizudocho 4-1-31, Amagasaki, Hyogo 661-0026, Japan;4. MAG-NEO, Suwa 1-4-23, Saitama Iwatsuki-ku, Saitama 339-0007, Japan;1. Instituto Federal do Espírito Santo, Vitória, ES, Brazil;2. Centro Universitário Norte do Espírito Santo, São Mateus, ES, Brazil;3. Laboratório de Telecomunicações, Universidade Federal do Espírito Santo, Vitória, ES, Brazil;1. Nanostructured Optical Devices Laboratory, Electrical and Electronic Engineering Department, Institute of Smart Cities, Public University of Navarra, Campus Arrosadia, 31006 Pamplona, Spain;2. Optical and Quantum Communications Group, iTEAM Research Institute, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain
Abstract:We present an in-fiber mode converter that changes the propagation ratio of two core modes. A dynamic long-period grating is constructed in a two-mode fiber by the combination of an electromagnet with a nonmagnetic spring coiled around a stiff iron rod. The fundamental mode is converted to the LP11 mode according to the voltage applied on the electromagnet. The mode-conversion wavelength can be tuned by stretching the coil spring. Compared to the coupling result with leaky cladding modes, the mode-conversion bandwidth expands from 5 nm to 90 nm and the drive voltage decreases almost by half.
Keywords:Mode converter  Electromagnet  Long-period grating  Microbending
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