Abstract

The principal problem in a multigigabit-per-second long-haul optical transmission system by direct modulation is waveform distortion by laser chirp, fiber nonlinearity, and fiber dispersion. Self-phase modulation (SPM) in the fiber can be compensated by equalizers with linear dispersion arranged within certain intervals.¹ Laser transient chirp can be treated similarly, although the direction of wavelength shift in the optical pulse caused by laser chirp is opposite to that caused by SPM.²·³ On the basis of these findings the authors have theoretically investigated a technique for simultaneously compensating laser chirp, SPM, and dispersion.

© 1993 Optical Society of America