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  • Received: Nov. 13, 2019

    Accepted: Dec. 26, 2019

    Posted: Apr. 14, 2020

    Published Online: Apr. 15, 2020

    The Author Email: Guifang Li (li@creol.ucf.edu)

    DOI: 10.3788/COL202018.040601

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    Huiyuan Liu, He Wen, Guifang Li. Applications of weakly-coupled few-mode fibers [Invited][J]. Chinese Optics Letters, 2020, 18(4): 040601

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Kkj=ω4dxdyΔε(x,y)ek(x,y)ej(x,y),(1)

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dA1dz=iK11A1+iK12A2exp[i(β2β1)z],dA2dz=iK22A2+iK21A1exp[i(β1β2)z],(2)

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2E+n2k02E=(2x2+2y2)E+(n2k02β2)E=0,(3)

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(2x2+2y2)E+2k12Δa2(x2+y2)E=(k12β2)E,(4)

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k12β2=22k12Δa2(mx+my+1),(5)

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β=k12k122Δa(mx+my+1)k12Δa(mx+my+1).(6)

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Δn=2Δak0.(7)

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Aex2+y22σ2dxdy=2πAσ2,(8)

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Aeff=(|E|2dxdy)2|E|4dxdy=2πσ2=2πak12Δ.(9)

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AeffΔn=2πak12Δ2Δak0=λ022πn1.(10)

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AeffΔnλ02=12πn1.(11)

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