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1 June 1994 Dynamic characteristics of 1.55-um strained MQW-DFB lasers: improvement of high-speed performance by gain-coupling effects
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Abstract
We have fabricated 1.55 micrometers ridge waveguide DFB lasers consisting of p-doped, 1.5% compressive strained-layer all quaternary MQW active region by two-step MOCVD with a first-order grating located in the upper GRINSCH region. By optimizing the p-doped carrier concentration in the barrier layers, kL and detuning, the measured -3 dB bandwidth was 13 GHz with flat frequency response and very little RC roll-off in this structure. From RIN measurements, the intrinsic bandwidth was calculated to be 18 GHz. Furthermore, by changing the position of the grating to the MQW active region, partly gain-coupled DFB lasers were formed; these devices exhibit very stable single mode operation and narrow spectral linewidths. The -3 dB electrical bandwidth was measured around 22 GHz and the intrinsic bandwidth was estimated to be 28 - 30 GHz. Experimental results show that the devices have small wavelength chirps and clear eye patterns under 10 Gbit/s NRZ direct modulation.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hanh Lu, Toshi Makino, Guo Ping Li, Stephen M. McGarry, Ronald S. Moore, B. Foster, and Norbert Puetz "Dynamic characteristics of 1.55-um strained MQW-DFB lasers: improvement of high-speed performance by gain-coupling effects", Proc. SPIE 2148, Laser Diode Technology and Applications VI, (1 June 1994); https://doi.org/10.1117/12.176619
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