Broadband air-clad LP02 mode converter using a tapered mode transition

Neethu Mariam Mathew*, Lars Grüner-Nielsen, Zepeng Wang, Lars Søgaard Rishøj, Karsten Rottwitt

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


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.
Original languageEnglish
JournalOptics Letters
Issue number1
Pages (from-to)38-41
Publication statusPublished - 2022


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