SPECTRAL FILTERING EFFECT OF FUSED FIBER COUPLERS IN FEMTOSECOND FIBER SOLITON LASERS

A fused fibre coupler has been used as a spectral filter in a femtosec ond fibre soliton laser to eliminate the spectral sideband structure a ssociated with periodic amplification of solitons in the regime where the characteristic soliton period of the generated pulses approaches t hat of the overall fibre laser loop length.