Abstract

Fiber nonlinear effects should be considered in the design of amplified long-haul terrestrial and submarine transmission systems. Increasing the fiber effective area can reduce fiber nonlinearity and, therefore, allow higher signal power and longer amplifier spacing. Recently, we have designed and fabricated triangular segmented-core dispersion-shifted fibers with effective areas more than 80 µm².¹ We have also demonstrated reduced self-phase modulation (SPM)-induced spectral broadening in these fibers compared to conventional dispersion-shifted fibers (DSF). In this work, we will report dispersion-shifted fibers having even larger effective area, ~90 µm², using dual-ring profiles, which result in an expanded field distribution and uniquely an effective area that is always larger than the Petermann-II mode-field area.

© 1996 Optical Society of America