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01259 am a22001453u 4500 |
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65474 |
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|a Jung, Yongmin
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|a Brambilla, Gilberto
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|a Richardson, David J.
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|a Broadband single-mode operation of standard optical fibers by using a sub-wavelength optical wire filter
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|c 2008-09-03.
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|u https://eprints.soton.ac.uk/65474/1/4200.pdf
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|a We report the use of a sub-wavelength optical wire (SOW) with a specifically designed transition region as an efficient tool to filter higher order modes in multimode waveguides. Higher-order modes are effectively suppressed by controlling the transition taper profile and the diameter of the sub-wavelength optical wire. As a practical example, single-mode operation of a standard telecom optical fiber over a broad spectral window (400~1700 nm) was demonstrated with a 1µm SOW. The ability to obtain robust and stable single-mode operation over a very broad range of wavelengths offers new possibilities for mode control within fiber devices and is relevant to a range of application sectors including high performance fiber lasers, sensors, photolithography, and optical coherence tomography systems.
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