Hi esakkimuthu,
I recalled one thing according to your questions. In one of the forums, I asked Damian about usage of electrodes for OptiBPM. He mentioned that OptiSPICE is definitely definitely suitable for circuit level design, which include optical component and interconnects (waveguides, micro rings). If I am not mistaken, there should be an option to save your component and add it to the library so you can use it in FDTD (that was a topic of the other forum as well).