Beyond 20 GHz bandwidth of partly gain-coupled 1.55 μm strained multiquantum well DFB lasers

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Abstract
The small signal frequency responses of partly gain-coupled 1.55 μm strained MQW DFB lasers were measured with a record −3 dB bandwidth of 22 GHz at 10 mW optical output power. Experimental results show that under 10 Gbit/s pseudorandom NRZ modulation, the devices have small wavelength chirps and clear eye openings making them suitable as light sources for direct modulation in 10 Gbit/s and higher bit rate optical communication systems.