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波导中模式耦合是一种普遍的现象. 在光纤通信中不同导模之间的耦合会引起串扰, 导模和辐射模的耦合会降低导模的功率. 另一方面, 利用模式耦合现象能设计出具有特定功能的耦合器和分束器等光学器件. 模式耦合在光纤通信和光纤传感中也具有广泛应用. 因此, 分析研究波导模式如何耦合具有重要的应用价值. 模式耦合理论是研究波导中模式耦合的常用方法, 不仅提供了一种直观的物理图景来描述光学模式如何杂化, 而且还对相关模式如何杂化给出定量评估. 近年来, 以宇称时间对称性结构为代表的非厄米波导成为研究热点, 但传统模式耦合理论在这种情况下不再适用. 本文简述了模式耦合理论的发展历史, 详细介绍了构造互易波导模式耦合理论的关键概念和方法, 进一步回顾了在波导模式耦合理论方面的一系列代表性工作, 尤其是手征对称模式耦合理论以及广义模式耦合理论, 总结了这些模式耦合理论和传统模式耦合理论之间的联系, 最后简单介绍了它们在宇称时间对称波导及各向异性波导中的应用.Mode coupling is a common phenomenon in waveguides. The mode coupling among different guided modes in fiber-optic communication can cause crosstalk, and the mode coupling of guided mode and radiated mode can reduce the power of the guided mode. Application of mode coupling can guide the design of optical devices such as couplers and beam splitters with specific functions, which have been widely used in fiber optic communication and fiber sensing. So it is important to analyze how waveguide modes are coupled. The coupled-mode theory is a common method of studying mode coupling in waveguides. It provides not only an intuitive picture of how the photonic modes are hybridized, but also a quantitative assessment of how the hybridization among those relevant modes evolves. In recent years, non-Hermitian waveguides, represented by parity-time symmetrical structures, have become a research hotspot. However the conventional coupled-mode theory no longer works in this case. In this review, we briefly summarize the development history of coupled-mode theory and introduce the representative work in reciprocal waveguide coupled-mode theory in detail. Then the relationship among several coupled-mode theories is analyzed and their applications are briefly introduced.
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Keywords:
- waveguide /
- mode /
- coupling /
- reciprocity
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图 1 前向和后向传播模式之间对称关系 (a) 手征对称; (b) 时间反演对称; (c) 宇称对称
Fig. 1. Symmetry relations between the forward and backward propagating modes: (a) Chiral symmetry; (b) time reversal symmetry; (c) parity symmetry.
图 2 有效折射率
$n_{\rm{eff}}$ 实部与$\Delta {{\varepsilon}} $ (a) 纤芯1 相对介电常数为${{\varepsilon}}= {{\varepsilon}}_0 + \Delta {{\varepsilon}} $ , 纤芯2 相对介电常数为${{\varepsilon}}= {{\varepsilon}}_0 + \Delta {{\varepsilon}} $ ; (b) 纤芯1 相对介电常数为${{\varepsilon}}= {{\varepsilon}}_0 + \Delta {{\varepsilon}} $ , 纤芯2 相对介电常数为${{\varepsilon}}= {{\varepsilon}}_0 - \Delta {{\varepsilon}} $ Fig. 2. Real part of effective mode indices
$n_{\rm{eff}}$ versus$\Delta {{\varepsilon}} $ : (a)${{\varepsilon}}= {{\varepsilon}}_0 + \Delta {{\varepsilon}} $ in core layer 1 and${{\varepsilon}}= {{\varepsilon}}_0 + \Delta {{\varepsilon}} $ in core layer 2; (b)${{\varepsilon}}= {{\varepsilon}}_0 + \Delta {{\varepsilon}} $ in core layer 1 and${{\varepsilon}}= {{\varepsilon}}_0 - \Delta {{\varepsilon}} $ in core layer 2.
图 3 有效折射率
$n_{\rm{eff}}$ 实部与虚部及$\Delta {{\varepsilon}} $ (a), (c) 有效折射率$n_{\rm{eff}}$ 实部; (b), (d) 有效折射率$n_{\rm{eff}}$ 虚部Fig. 3. Real part and imaginary part of effective mode indices
$n_{\rm{eff}}$ versus$\Delta {{\varepsilon}} $ : (a), (c) Real part of effective mode indices$n_{\rm{eff}}$ ; (b), (d) imaginary part of effective mode indices$n_{\rm{eff}}$ .
图 4 各向异性波导 (a) 椭圆波导示意图; (b) 使用有限元法进行全波计算得到的有效折射率
$n_{\rm{eff}}$ 实部(红线)和虚部(黑线)与${{\varepsilon}}_{\rm{r}}$ 函数关系; (c)有效折射率$n_{\rm{eff}}$ 实部; (d) 有效折射率$n_{\rm{eff}}$ 虚部; (e)—(h) 图(b)中黑色实心圆标记点前向/后向传播模式$\phi$ 的$E_x$ 分量的实部/虚部Fig. 4. Anisotropic waveguide: (a) The schematic of elliptical waveguide; (b) the real (red line) and imaginary (black line) part of effective modal indices, calculated from fullwave simulation using finite element method, as a function of
${{\varepsilon}}_{\rm{r}}$ ; (c) real part of effective mode indices$n_{\rm{eff}}$ ; (d) imaginary part of effective mode indices$n_{\rm{eff}}$ ; (e)−(h) the real/imaginary part of$E_x$ obtained from fullwave simulation is shown for the modes$\phi$ 表 1 当
$\beta_i > 0$ 时, 互易波导中原始场和伴随场之间的对称关系Table 1. Symmetric relation of original field and adjoint field in the reciprocal waveguides with
$\beta_i > 0$ $\beta_i$对应的模式 $-\beta_i$对应的模式 $({\bar{{L}}}, {\bar{{B}}})$ $\left[\beta_i, {{\phi}}_i\right]$ $\left[-\beta_i, {{\psi}}_i\right]$ $({\bar{{L}}}^{\rm{a}}, {\bar{{B}}}^{\rm{a}})$ $\left[\beta_i, {{\psi}}_i\right]$ $\left[-\beta_i, {{\phi}}_i\right]$ 
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表 2 互易波导中原始场和伴随场之间的对称关系
Table 2. Symmetry relations of original field and adjoint field in the reciprocal waveguides.
对称关系 算符 对称性关系 约束条件 手征对称 ${\sigma}$ ${{{\psi}}}_i({{r}}) = {\bar{\sigma}}{{{\phi}}}_i({{r}})$ ${{{\varepsilon}}}_{\rm r}^{zt} = {{{\varepsilon}}}_{\rm r}^{tz} = 0$, ${{{\mu}}}_{\rm r}^{zt} = {{{\mu}}}_{\rm r}^{tz} = 0$和${\bar{ \chi}} = 0$ 时间反演对称 ${\cal{T}}$ ${{{\psi}}}_i({{r}}) = {\bar{\sigma}}({{{\phi}}}_i({{r}}))^*$ ${\bar{{{\varepsilon}}}}_{\rm r}$, ${\bar{{{\mu}}}}_{\rm r}$和${\bar{ \chi}}$是实数 宇称对称 ${\cal{P}}$ ${{{\psi}}}_i({{r}}) = {\bar{\sigma}}{{{\phi}}}_i(-{{r}})$ ${\bar{{{\varepsilon}}}}_{\rm r}({{r}}) = {\bar{{{\varepsilon}}}}_{\rm r}(-{{r}})$, ${\bar{{{\mu}}}}_{\rm r}({{r}}) = {\bar{{{\mu}}}}_{\rm r}(-{{r}})$和 ${\bar{ \chi}}({{r}}) = -{\bar{ \chi}}(-{{r}})$
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表 3 CCMT, GCMT和GCMF之间比较
Table 3. Comparison between CCMT, GCMT and GCMF.
模式耦合理论 传统模式耦合理论(CCMT) 手征对称模式耦合理论(GCMT) 广义模式耦合理论(GCMF) 耦合模式展开式形式 $\varPhi =\displaystyle \sum a_i\phi _i$ $\varPhi = \displaystyle\sum a_i\phi _i$ $\varPhi = \displaystyle\sum a_i\phi _i ^+ +b_i \psi _i ^-$ 守恒量 光功率守恒
$\nabla \left({{{{E}}} _1 \times {{{H}}} _2 ^{\ast}} + {{{E}}} _2 ^{\ast} \times {{{H}}}_1\right) = 0$作用量守恒
$\nabla \left({{{{E}}} _1 \times {{{H}}} _2 } + {{{E}}} _2 \times {{{H}}}_1\right) = 0$作用量守恒
$\nabla \left({{{{E}}} _1 \times {{{H}}} _2 } + {{{E}}} _2 \times {{{H}}}_1\right) = 0$测试函数 $\phi _j ^{\ast} $ $\sigma \phi _j$ $ \psi _j ^+$, $\psi _j ^-$ 本征方程 ${\bar{{L}}}{{\phi}}_i = \beta_i {\bar{{B}}}{{\phi}}_i $ ${\bar{{L}}}{{\phi}}_i = \beta_i {\bar{{B}}}{{\phi}}_i $ ${\bar{{L}}}{{\phi}}_i = \beta_i {\bar{{B}}}{{\phi}}_i$ 测试函数进行测试 $\displaystyle\iiint \phi _j ^{\ast} [{\bar{{L} } }{{\phi} }_i-\beta_i {\bar{{B} } }{{\phi} }_i]{\rm{d} }v \!=\! 0$ $\displaystyle\iiint \sigma \phi _j [{\bar{{L} } }{{\phi} }_i-\beta_i {\bar{{B} } }{{\phi} }_i]{\rm{d} }v \!=\! 0$ $\displaystyle\iiint \psi _j \cdot [{\bar{{L} } }{{\phi} }_i \!-\! \beta_i {\bar{{B} } }{{\phi} }_i]{\rm{d} }v \!=\! 0$
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[1] Pierce J R 1954 J. Appl. Phys. 25 179
Google Scholar
[2] Gould R W 1955 IRE Trans. Electron Devices PGED-2 37
Google Scholar
[3] Louisell W H 1960 Coupled-Mode and Parametric Electronics (New York: Wiley) pp148–225
[4] Miller S E 1954 Bell Syst. Tech. J. 33 661
Google Scholar
[5] Miller S E 1968 Bell Syst. Tech. J. 47 1801
Google Scholar
[6] Miller S E 1969 Bell Syst. Tech. J. 48 2189
Google Scholar
[7] Tang C C H 1969 Advances in Microwaves 4 301
Google Scholar
[8] Schelkunoff S A 1955 Bell Syst. Tech. J. 34 995
Google Scholar
[9] [10] Marcuse D 1971 Bell Syst. Tech. J. 50 1791
Google Scholar
[11] Marcuse D 1973 Bell Syst. Tech. J. 52 817
Google Scholar
[12] Snyder A W 1972 J. Opt. Soc. Am. 62 1267
Google Scholar
[13] Snyder A W 1970 IEEE Trans. Microwave Theory Tech. 18 383
Google Scholar
[14] Yariv A 1973 IEEE J. Quantum Electron. 9 919
Google Scholar
[15] Taylor H F, Yariv A 1974 Proc. IEEE 62 1044
Google Scholar
[16] Kogelnik H 1969 Bell Syst. Tech. J. 48 2909
Google Scholar
[17] McIntyre P D, Snyder A W 1973 J. Opt. Soc. Am. 63 1518
Google Scholar
[18] Yeh C, Manshadi F, Casey K F, Johnston A 1978 J. Opt. Soc. Am. 68 1079
Google Scholar
[19] Dionnet M J F, Shaw H J 1982 IEEE Trans. Microwave Theory Tech. 30 592
Google Scholar
[20] Thyagarajan K, Tewari R 1985 J. Lightwave Technol. 3 59
Google Scholar
[21] Zhang M, Garmire E 1987 J. Lightwave Technol. 5 260
Google Scholar
[22] Elechi C, Yeh C 1973 Opt. Commun. 7 201
Google Scholar
[23] Stoll H, Yariv A 1973 Opt. Commun. 8 5
Google Scholar
[24] Yeh P, Taylor H F 1980 Appl. Opt. 19 2848
Google Scholar
[25] Syms R R A 1985 Appl. Opt. 24 717
Google Scholar
[26] Marcuse D 1987 J. Lightwave Technol. 5 268
Google Scholar
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Google Scholar
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Google Scholar
[29] Chuang S L 1987 J. Lightwave Technol. 5 5
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
Li L, Liu G Q, Chen Y H 2013 Acta Opt. Sin. 33 0123002
Google Scholar
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Google Scholar
Wu L H, Wang M H 2015 Acta Opt. Sin. 35 0923003
Google Scholar
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Google Scholar
[56] 张志东, 赵亚男, 卢东, 熊祖洪, 张中月 2012 61 187301
Google Scholar
Zhang Z D, Zhao Y N, Lu D, Xiong Z H, Zhang Z Y 2012 Acta Phys. Sin. 61 187301
Google Scholar
[57] 王立文, 娄淑琴, 陈卫国, 鹿文亮, 王鑫 2012 61 154207
Google Scholar
Wang L W, Lou S Q, Chen W G, Lu W L, Wang X 2012 Acta Phys. Sin. 61 154207
Google Scholar
[58] Xu J, Wu B, Chen Y T 2015 Opt. Express 23 11566
Google Scholar
[59] Sakurai J J, Tuan S F 1994 Modern Quantum Mechanics (Rev. Ed.) (Reading, Mass.: Addison-Wesley Pub. Co.) pp71–73
[60] Rumsey V H 1954 Phys. Rev. 94 1483
Google Scholar
[61] Moiseyev N 2011 Non-Hermitian Quantum Mechanics (New York: Cambridge University Press) pp174–210
[62] Collin R E 1960 Field Theory of Guided Waves (New York: The Maple Press) p231
[63] McIsaac P R 1991 IEEE Trans. Microwave Theory Tech. 39 1808
Google Scholar
[64] Villeneuve A T 1959 IEEE Trans. Microwave Theory Tech. 7 441
Google Scholar
[65] Silvestre E, Abián M A, Gimeno B, Ferrando A, Andrés M V, Boria V E 2000 IEEE Trans. Microwave Theory Tech. 48 589
Google Scholar
[66] Snyder A W, Love J D 1983 Optical Waveguide Theory (New York: Springer Science & Business Media) pp214–216
[67] Zhu Y, Cangellaris A C 2006 Multigrid Finite Element Methods for Electromagnetic Field Modeling (Hoboken, N.J.: Wiley-IEEE Press) pp244–249
[68] 钱景仁 2009 光学学报 29 1188
Qian J R 2009 Acta Opt. Sin. 29 1188
[69] Liu H, Lalanne P 2008 Nature 452 728
Google Scholar
[70] Chen Y T, Zhang R Y, Xiong Z F, Hang Z H, Li J S, Shen J Q, Chan C T 2019 Nat. Commun. 10 3125
Google Scholar
[71] Shi H K, Xiong Z F, Chen W J, Xu J, Wang S B, Chen Y T 2019 Opt. Express 27 28114
Google Scholar
[72] Bender C M, Boettcher S, Meisinger P N 1999 J. Math. Phys. 40 2201
Google Scholar
[73] Bernevig B A, Hughes T L 2013 Topological Insulators and Topological Superconductors (Princeton: Princeton University Press) pp30–40
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