TRANSMISSION CHARACTERISTICS OF DFB LASER MODULES FOR ANALOG APPLICATIONS

In this paper, analog transmission characteristics of highly linear 1. 3 and 1.55-mum DFB laser modules are described. To obtain high-power a nd high-performance DFB lasers, the bias dependence of distortion char acteristics is discussed. The carrier-to-noise ratio, the composite se cond-order distortion, and the composite triple beat of the DFB laser module which is developed for analog CATV application are presented. T he analog transmission characteristics, such as CNR degradation after fiber transmission, dispersion-induced distortion, and the influence o f reflection, have been made clear. The stable high linearity of the D FB laser also has been confirmed by the composite distortion measureme nt under an accelerated aging test.