I am designing a 3D wave guide using comsol multiphysics as core (Silicon nanocrystal and Sio2 composite refractive index is 1.595,length=100nm,width=300nm,height=100nm) and cladding (silicon refractive index 3.48,length=100nm,width=300nm,height=200nm).
At the input end I want to provide two supplies; pump (power=.3 and wavelength=1434nm) and signal (power=.003 and wavelength=1550nm).
Then I want to calculate mode overlapping factor between (signal and signal,pump and pump,signal and pump,pump and signal).
Here I am attaching the comsol model I designed.
It depends on which mode you would like to excite. Plus, the ion distribution determine the overlap calculation strategy as well. Considering a uniform doping, if the mode for both pump and signal is mono and symmetric, e.g. fundamental mode in SMF,one can use derived value with surface integral to calculate the power within the core and total cross section, respectively. The powers will be calculated twice with different wavelength, one for pump, another is signal. Then the overlap is obtain by power filling ratio, i.e. power of core over total power. Else if there are multi modes and some are asymmetric, a spatial discrete should be employed due to the mode intensity is spatial dependence. Moreover, if the dopant is not uniform, such spatial discrete is suggested to utilize. In that way, using Matlab co-simulation in order to track the data of mode intensity and calculate the overlap as function of radial and azimuthal position.
Hope it will be helpful.
thank u sir this information is beneficial for me but sir how to implement all those in comsol pls sir guide me
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