Abstract

Higher-order mode converters that work over a broad wavelength range are needed for various applications. A new, to the best of our knowledge, simple and cost-effective LP₀₂ mode converter is fabricated by tapering a bundle of single-mode fibers. The device excites the LP₀₂ mode in a four-mode step index fiber with a mode purity higher than 10 dB. The polarization-dependent cross talk of the device is measured using the S² technique. The LP₀₂ mode selectivity of the device is measured over the entire C and L bands by selectively launching different modes into the device using a spatial light modulator.

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