hi kevin xiang,
fused fiber technology comes with low excess loss, high extinction ratio, and high optical power handling….
GREAT work indeed cheers….but what software have you used before you went on physical fabrication…
looking ahead for your response
for others.. visit the links for basic
https://www.academia.edu/741521/Analysis_and_Fabrication_of_Fused_Fiber_Optic_Couplers_for_Communication_Systems
with regards