OPTICAL SYSTEM AND METHOD HAVING LOW LOSS AND NON-LINEAR EFFECTS

摘要

An apparatus and method for transmitting an optical signal. The invention is directed to a transmission line having first (16) and second (18) spans of single mode fiber. The fiber of the first span has a negative dispersion with an absolute value of between about 2.5 ps/nm/km and 10 ps/nm/km at the operating wavelength. The second span (1 8) is connected to the first span (16) and has a positive dispersion at the operating wavelength. The positive dispersion of the secon d span compensates for the negative dispersion of the first span such that the cumulative dispersion across the first and second spans i s approximately zero. The increased dispersion of the first span coincides with characteristics to lower non-linear effects, permits a longer length of the second span, and helps lower attenuation in the transmission line.