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Gain saturation coefficients of strained-layer multiple quantum-well distributed feedback lasers

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4 Author(s)
Yasaka, H. ; NTT Opto-Electron. Lab., Kanagawa, Japan ; Takahata, K. ; Yamamoto, Norio ; Naganuma, M.

The gain saturation coefficients were measured for strained and unstrained multiple quantum-well distributed feedback (MQW-DFB) lasers. The gain saturation coefficient depends on the deviation of the laser's transverse-magnetic (TM) mode gain peak wavelength from its transverse-electric (TE) mode gain peak wavelength delta lambda , which is related to the strain on the active-layer wells. The gain saturation coefficient epsilon increased with increasing compressed strain on the active-layer wells. The coefficient epsilon of the unstrained MQW DFB laser with a wavelength deviation delta lambda of -350 AA was 2.45 x 10/sup -17/ cm/sup 3/, and epsilon increased up to 12.6 x 10/sup -17/ cm/sup 3/ in the SL-MQW DFB laser with a wavelength difference delta lambda of -890 AA.

Published in:

Photonics Technology Letters, IEEE  (Volume:3 ,  Issue: 10 )