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Low-chirp and high-power 1.55-μm strained-quantum-well complex-coupled DFB laser

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5 Author(s)
Chi-Yu Wang ; Telecommun. Lab., Minist. of Transp. & Commun., Taoyuan, Taiwan ; Zuon-Min Chuang ; Wei Lin ; Yuan-Kuang Tu
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High-power, low-chirp, and low-threshold current characteristics of 1.55 μm complex-coupled compressively strained InGaAsP quantum-well DFB laser with a loss grating are presented. Kink-free light-current characteristics with single-mode power over 40 mW are demonstrated for uncoated devices. A relatively low threshold current of 10 mA and a high slope efficiency of 0.23 W/A have been obtained even with the loss grating employed. Stable single-mode emission was demonstrated with a side mode suppression ratio up to 54 dB, a low chirp of less than 0.3 nm under 1 Gb/s pseudorandom digital modulation and a spectral linewidth of 8 MHz.

Published in:

Photonics Technology Letters, IEEE  (Volume:8 ,  Issue: 3 )