Abstract
DFB lasers with high single-mode yield, high modulation bandwidth, and narrow linewidth emitting at a 1.55-μm wavelength are desirable for long-haul and high-bit-rate optical communication systems. One of the approaches is to use partly-gain-coupled strained MQW DFB lasers,1,2 in which some QWs are etched away periodically to form mixed index/gain coupling. Figure 1 shows the experimental AM response with κL ~ 5.2. The measured 3-dB modulation bandwidth is about 22 GHz, and the estimated intrinsic modulation bandwidth is around 28 GHz.2 For a similar index-coupled DFB laser of uniform grating with κL ~ 3, the measured modulation bandwidth is significantly lower, at only about 13 GHz, under a similar bias current.
© 1995 Optical Society of America
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