MODE CONVERSION DEVICE AND DESIGN METHOD
An objective of the present invention is to provide a mode conversion device capable of designing any coupling efficiency and full width at half maximum, and a design method therefor.According to the present invention, a mode conversion device includes a long period grating at a core of an optical f...
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Main Authors | , , , |
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Format | Patent |
Language | English |
Published |
02.05.2024
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Subjects | |
Online Access | Get full text |
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Summary: | An objective of the present invention is to provide a mode conversion device capable of designing any coupling efficiency and full width at half maximum, and a design method therefor.According to the present invention, a mode conversion device includes a long period grating at a core of an optical fiber through which light is able to propagate in at least two propagation modes. The long period grating satisfies a relationship of Expression C1, where a full width at half maximum FWHM is a wavelength band in which the coupling efficiency is a half of coupling efficiency of mode conversion at a center wavelength, C is coupling efficiency, Lc is a complete coupling length, Lg is a grating length, Λ is a grating pitch, and Δβ is a propagation constant difference between the two propagation modes at the center wavelength of a mode conversion target.[Math.C1]Λ=2πΔβC=sin2(π2LgLc)FWHM·Lc=b❘"\[LeftBracketingBar]"dΔβdλ❘"\[RightBracketingBar]"-1b=-1169.3C+1705.6(C1) |
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Bibliography: | Application Number: US202118277320 |