波导中由行波引起的光放大与衰减
Amplification and attenuation of light in a waveguide modulated by a travelling wave
AI总结：
本文研究了波导中由行波引起的光放大与衰减现象，通过分析四种调制情况，揭示了反斯托克斯共振是观察调制诱导光放大的最有利条件。
摘要：
在光学波导中传播的光可以通过与行波声波或介电常数的射频调制相互作用而增益或损失功率。本文通过考虑一个光学波与一个弱行波介电常数扰动的相互作用来建模这种传播，该扰动的频率远小于光学频率，其幅度沿传播方向呈指数衰减。分析了四种调制情况：瞬时调制、同步调制以及斯托克斯和反斯托克斯共振。对于这些情况，得到了载波和边带的传输和反射功率以及总增益和损失功率的简单表达式。尽管对于现实的调制和波导参数，可实现的总增益仍然很小，但反斯托克斯共振被识别为观察调制诱导光放大最具有前景的条件。
英文摘要：
Light propagating in an optical waveguide can gain or lose power through interaction with a travelling acoustic wave or radio-frequency modulation of permittivity. Here, we model this propagation by considering an optical wave interacting with a weak travelling-wave permittivity perturbation whose frequency is much smaller than the optical frequency and whose amplitude decays exponentially along the propagation direction. Four modulation cases are analyzed: instantaneous modulation, synchronous modulation, and the Stokes and anti-Stokes resonances. For these cases, simple expressions are obtained for the carrier and sideband transmission and reflection powers as well as for the total gain and loss powers. Although the achievable total gain remains small for realistic modulation and waveguide parameters, the anti-Stokes resonance is identified as the most promising condition for observing modulation-induced light amplification.
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