Mode coupling in 340 µm GeO₂ doped core-silica clad optical fibers

The state of mode coupling in 340 µm GeO₂ doped core-silica clad optical fibers is investigated in this article using the power flow equation. The coupling coefficient in this equation was first tuned such that the equation could correctly reconstruct previously reported measured output power distributions. It was found that the GeO₂ doped core-silica clad optical fiber showed stronger mode coupling than both, glass and popular plastic optical fibers. Consequently, the equilibrium as well as steady state mode distributions were achieved at shorter fiber lengths in GeO₂ doped core-silica clad optical fibers.