Mode coupling in low NA plastic optical fibers

• The state of mode coupling in low NA (0.3) step-index plastic optical fibers is investigated.
• The coupling length Lc at which the equilibrium mode distribution is achieved is obtained.
• The length zs of the fiber required for achieving the steady-state mode distribution is also determined.

Using the power flow equation and experimental measurements, investigated in this article is the state of mode coupling in low NA (0.3) step-index plastic optical fibers for laser beam launch. Results show the coupling length Lc at which the equilibrium mode distribution is achieved and the length zs of the fiber required for achieving the steady-state mode distribution. Numerical results obtained using the power flow equation agree well with experimental measurements.