Multimode fiber losses calculation with bend radius

- July 30, 2024 at 3:58 pm
  mercedes.alconcamas
  Subscriber
  I am trying to calculate the multimode optical fiber losses with bend radius. I do have questions over the following two topics:
  1. How can I calculate the losses? shall I track/sweep several modes and add up their combined losses or is there any better way to do it?
  2. Once the bend radius is small enough, even the fundamental mode seems to disappear but the modelling shows other modes. Are those other modes real? I don’t understand where they are coming from.
  I would appreciate any help.
- July 30, 2024 at 5:57 pm
  
  Guilin Sun
  Ansys Employee
  
  FDE in MODE can simulate mode properties such as mode loss.
  You will be able to get the loss for each individual modes. How do you calculate the "combined" loss for a few modes together will up to you.
  Whether the mode is physical or not, you can use PML and set sufficient number of trial modes, and see if the mode appears.