Development of frequency comb generation by spectral broadening of periodic optical pulses in semiconductor laser amplifiers

Abstract

This paper reports an approach for the generation of an ultra-flat and ultra-wide optical frequency comb by the exploitation of gain modulation experienced by a periodic third ordered gaussian shaped optical pulse propagating inside the active region of semi-conductor optical amplifier (SOA). The gain of SOA is independent to the polarization state and phase of optical signals which makes it more favourable and stable approach for the generation of optical frequency comb. This paper reports a 94-line optical frequency comb with 5 dB maximum power deviation and 190-line optical frequency comb with 10 dB maximum power deviation.