ABSTRACT
The dynamic response of the optical output power to changes of the impressed current depends on the dynamic behaviour of the laser process itself on the electrical properties of the laser diode, such as the lead inductance and capacity of the laser package. The optical pulse shape is characterized by a sharp rise, followed by relaxation oscillations, which can be extremely pronounced according to the type of laser. The spherical reflector is placed at a distance equivalent to about half the optical laser resonator length from the rear laser mirror. The optical isolator placed between the lasers prevents feedback to the master. The requirements established for application of lasers in a broadband transmission system can be summarized as follows: the intensity noise should be as low as possible; the overall power consumption should be low and there should be little sensitivity to optical feedback in the laser.
