Photodigm’s DBR seed laser diodes provide excellent spectral stability and high power for pulsed applications. These lasers are capable of producing pulses as short as a few 10’s of picoseconds and can exhibit a high degree of spectral stability, required for a seed laser for high-gain fiber amplifiers.
These short pulses are obtained through the process of gain switching. Gain switching occurs as a large number of carriers are initially pumped into the active region of the laser. Once the laser is pumped above threshold, a surge of stimulated emission depletes the carriers faster than they can be injected, resulting in a very short, high power spike -- the gain switch spike of the pulsed DBR laser.
Photodigm customers are using gain switched pulsed dbr laser diodes for the following applications: