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Gain saturation and propagation characteristics of index-guided tapered-waveguide traveling-wave semiconductor laser amplifiers (TTW-SLAs)

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3 Author(s)
Bendelli, G. ; Dept. of Phys. Electron., Tokyo Inst. of Technol., Japan ; Komori, K. ; Arai, S.

A model is developed to investigate the propagation characteristics and gain saturation performances of tapered-waveguide traveling-wave semiconductor laser amplifiers (TTW-SLAs). The influences of several physical mechanisms are analyzed. Two taper geometries are studied in detail: the exponential TTW-SLA and the linear TTW-SLA. The first is shown to be more efficient for narrow tapers (output width <14 μm), whereas the linear TTW-SLA becomes superior for wide-taper geometries because of its better adiabatic propagation characteristics. Both tapered structures can provide a consistent improvement in the saturation output power compared to the conventional TTW-SLA, reaching absolute values on the order of ~18 dBm and ~23 dBm for the exponential and linear TTW-SLAs, respectively

Published in:

Quantum Electronics, IEEE Journal of  (Volume:28 ,  Issue: 2 )