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模式重叠计算
模式重叠计算
TAGGED: lumerical
December 12, 2022 at 6:27 am
li-liucun-rc
Subscriber
老师好！我在使用MODE的overlap功能计算一个模斑转换器和光纤的耦合效率，就像 https://optics.ansys.com/hc/en-us/articles/360042305354 中Step1那样，但是看上去模场径相差很远的SSC模式和Fiber模式为什么却有超过90%的功率耦合效率呢？
December 12, 2022 at 6:07 pm
Guilin Sun
Ansys Employee
你看的是模斑，应该看场分量。
另外，OVERLAP计算出来的是估算，你看看其前提，不考虑反射。实际耦合效率可能不是这个数，你可以用FDTD加Port仿真一下。注意要选合适的模式。请参考 https://optics.ansys.com/hc/en-us/articles/360034396834-Understanding-the-mode-overlap-calculation
December 13, 2022 at 1:24 am
li-liucun-rc
Subscriber
谢谢孙老师！还有两个问题想请教您：
模式重叠的功率耦合效率不应该是跟模场径和offset有关吗？其中模场径从这个图里面看不出来吗？应该从哪里才能看出来呢？看场分量的话应该看哪一个分量呢？用FDTD加Port的话感觉比较耗费时间，请问可以用EME来计算吗？EME可以计算这种沿传播方向上折射率有（不大的）突变的情况吗？还望不吝赐教！谢谢！
December 13, 2022 at 1:43 am
Guilin Sun
Ansys Employee
这个你需要再琢磨一下了，比如光纤的两个TETM模式，模场半径可能一样，但是两个因为正交，耦合效率是零。
你大致看一下两个模式的EzEy。看只是看，不影响计算。
对这种只有一个界面的情况，FDTD仿真不会费多长时间。如果是光纤，只包括包层一部分，不截断模式即可。EME也可以，但是要选择合适的模式个数，也需要有对EME较好的理解。两种方法都行。
September 18, 2023 at 2:20 pm
hj17629929218
Subscriber
楼主你好，请问您是否解决EME仿真overlap的问题呢，或者您是使用什么方法计算overlap的，我仿真fiber-to-chip的端面耦合耦合效率始终在30%左右，是否方便和您讨论一下？
September 18, 2023 at 3:44 pm
Guilin Sun
Ansys Employee
为什么要用EME计算OVERLAP？ EME可以计算整个器件的耦合效率或者S参数，比Overlap精确。
OVERLAP仅适用于知道两个器件的模式分布，在不考虑反射情况下估算的。
你可能需要对两种算法以及你要的结果做进一步分析研究，琢磨一下。
September 19, 2023 at 1:42 am
hj17629929218
Subscriber
孙博您好，我现在仿真反taper型端面耦合器的模斑耦合效率，使用https://optics.ansys.com/hc/en-us/articles/360042305354 中的方法但感觉有些不妥，感觉案例方法是两个直波导之间模式的耦合效率，并不能反映真实的taper渐变过程，请问有什么更好的方法来计算光纤和经taper传输后的波导中的模场耦合效率吗？
September 20, 2023 at 3:59 pm
Guilin Sun
Ansys Employee
Overlap 只能计算模式与模式，你如果想用EME仿真结果（含多个模式）与直波导的模式耦合，需要将EME中的多个模式相关叠加得到总电场与总磁场，然后用公式写脚本来做Overlap。
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