LP_mode_value
- ofiber.LP_mode_value(V, ell, em)[source]
Calculate guided b for mode (ell,em) in a circular step-index fiber.
b is the normalized propagation constant. Each guided mode in an optical fiber has a specific value of b that depends on the fiber parameter V and the mode number.
If no mode exists, a value of None is returned
The LP_lm is specified by the (ell,em) to avoid confusion between the number 1 and the letter l.
For cylindrical fibers, em is a positive integer: thus there are modes LP_01, LP_02, but not LP_10.
- Parameters:
V – V-parameter for optical fiber [-]
ell – primary fiber mode (integer) [-]
em – secondary fiber mode (integer>0) [-]
- Returns:
guided normalized propagation constant for mode (ell,em) [-]