All-normal dispersion mode-locked fiber lasers (ANDi-FLs) are emerging as promising pulse sources, where the pulse energy can be increased by simply elongating the cavity to reduce the repetition rate [1]. Recently, ultralong cavity (~1 km length) lasers have been demonstrated, producing ~ns duration giant-chirped pulses at ~100s kHz repetition rates [2]. Such sources could be convenient front-ends for compact chirped-pulse amplification systems, although to achieve high peak powers after amplification the pulses must be compressed (i.e. dechirped): a challenge yet to be solved due to the giant chirp of such nanosecond pulses. Here, we report a compression technique using a 400 mm long chirped fiber Bragg grating (CFBG), showing that after generating and amplifying 1.02 ns giant-chirped pulses, they can be compressed to 11 ps, enhancing the peak power by a factor of ~100.

© 2015 IEEE

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