Large bandwidth, highly efficient mode coupling using long-period gratings in dispersion tailored fibers
01 January 2001
We report the demonstration of strong (>20 dB) coupling in long- period fiber-gratings over bandwidths as large as 50 nm. These novel spectra are obtained by suitably tailoring the dispersion properties of a fiber, such that the phase matching condition is satisfied over a large wavelength range. The polarization dependent coupling for the mode-converters varies by less than 0.004% over the entire spectrum.