ANALYTICAL FORMULATION OF DISTORTION AND CHIRP IN CATV DFB LASERS INCLUDING SPATIAL HOLE-BURNING

Analytical formulas for distortions permitting the calculation of comp osite second order (CSO) and composite triple beat (CTB) in distribute d feedback (DFB) laser diodes are given, including gain compression an d longitudinal spatial hole burning (LSHB), An improved chirp expressi on including both effects is also proposed. Gain compression is compar ed to LSHB over the CATV band: LSHB effects on distortion and chirp ar e found to be dominant in actual CATV lasers, Nonmonotonous behavior ( dips) function of frequency and bias current is verified in second-and third-order distortions in agreement with recent results.