Wideband and High Dynamic DFB Laser Used for Short Pulse Recovery

The directly modulated distributed feedback (DM-DFB) laser module is applied as a signal recovery device in a ~3ns pulse modulated 1053 nm laser system. We present its performance on short pulse recovery with various pulse waveforms. The DM-DFB laser has a bandwidth as high as 20 GHz with in-band flatness less than ±3 dB. The dynamic range of the high linear DM-DFB laser is as high as 60 dB. The recovery system employing this DM-DFB laser can operate normally with the original pulse peak amplitude dynamic range of 100:1. The experimental results show that both rectangular wave pulse and exponential wave pulse have been excellently recovered through the recovery system. The normalized deviation is lower than 0.3% when the original pulse peak amplitude is higher than 1000 mV.