How to calculate the losses at the waveguide bends and model the bends?

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Malcolm White

Try these

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-47-16-2961

https://www.rp-photonics.com/bend_losses.html

http://photonics.intec.ugent.be/download/pub_1629.pdf

https://www.photond.com/products/fimmwave/fimmwave_applications_07.htm

Nouman Zia

Maybe you can try Lumerical FDTD. They have also an evaluation version with nice tutorials about how to start a design.

Somnath Paul

Thank you for your comments and referances !

Regis Orobtchouk

The best for the modeling of radiation losses induced by bend is to use a mode solver in cylindrical coordinates with boundary conditions like PML or TBC (TBC are better). Commercial software (Lumerical, rsoft, VFEM of Optiwave).

Please find 2 attached files with some details of the method use in a mode solver.

Regards