In this work, an advanced multifunctional optical switch based on multimode fibers is proposed. It can work as a3×1 optical multiplexer/combiner, a 2×2 optical switch, a variable optical attenuator and a variable optical power splitter. Allthese functionalities can be developed in the same device without any hardware modification, only by using the proper portsand control electronics.The proposed switch has been developed for being used in the visible and near infrared wavelength range: 450–650 nm foroptical fiber automobile applications, 650–850 nm for home broadband applications; and 850–1300 nm for multimode fiberaccess networks. Up to three different types of twisted nematic liquid crystal cells have been designed and fabricated forfulfilling these different wavelength ranges as part of the proposed device.The multifunctional switch has been implemented and experimentally tested. Crosstalk usually better than−15 dB at 532 nm,660 nm and 850 nm, in any state has been measured. Switching is achieved at voltage levels of 4 Vrms. Fiber to fiber insertionlosses when operating as a 2×2 optical switch, range from 10 to 15 dB within 200 nm wavelength range; with a non-optimizedoptics for collimation and coupling.
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