REDUCTION OF PULSATIONS IN DFB LASERS

摘要

Output power fluctuations in a distributed feedback laser arrangement (1) ar e reduced by inducing a saturable absorption grating in a saturable absorption region. Light is coupled into a DFB region (2) and amplified in an amplification region (4). A feedback loop (5) reflects a portion of the amplified light, and the counter-propagating beams induce an absorption grating in a saturable absorption region which suppresses output oscillation s. The amplification region (4) can comprise an erbium doped fiber, and the saturable absorption region can comprise an underpumped portion of such a fiber, or a further length of such fiber, or a planar waveguide.