To design optical band pass interference filter

Can you be more specific about the type of filer you have in mind? If you want to design Bragg gratings or thin film optical filters I recommend the transfer matrix method. If you want to design ring resonators I recommend finite-difference frequency-domain or finite-difference time-domain. Here is a link to an online FDTD course and then another link to a Computational Electromagnetics course. Between these two, all of the methods I have mentioned are covered.

https://empossible.thinkific.com/courses/1D-FDTD

http://emlab.utep.edu/ee5390cem.htm

The first link above provides all of the codes in MATLAB.