The paper describes the constraints placed on modulation bandwidths of horizontal cavity semiconductor lasers by the dissipative and dispersive effects due to the transmission of electric signals along a narrow injection stripe. The calculations employ a distributed transmission-line model where the incremental small-signal laser equivalent circuit incorporates the effects of photon-carrier interactions represented in relaxation oscillations. At 150 µm cavity length, such as those feasible in strained quantum-well structures, the bandwidths appear to be limited to approximately 30 GHz even under the most idealised conditions. It is suggested that further improvements in bandwidths will require a judicious design of the laser travelling-wave structure. Vertical cavity laser structures may offer an alternative approach to increasing the bandwidth.
Transmission-line delay limitations of laser bandwidths
1994-06-01
4 pages
Article (Journal)
English
relaxation oscillations , laser bandwidths , modulation bandwidths , incremental small-signal laser equivalent circuit , horizontal cavity semiconductor lasers , strained quantum-well structures , vertical cavity laser structures , laser cavity resonators , cavity length , transmission-line delay limitations , transmission line theory , dissipative effects , laser theory , distributed transmission-line model , narrow injection stripe , laser travelling-wave structure , electric signals , 30 GHz , photon-carrier interactions , dispersive effects , optical modulation , semiconductor lasers , 150 mum
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