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High performance and highly reliable λ/4 shifted MQW-DFB-DC-PBH-LDs for Gb/s coherent optical communication systems

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8 Author(s)

The authors demonstrate high-performance and highly reliable single-frequency quarter-wave (λ/4)-shifted multiple-quantum-well distributed-feedback laser diodes with double-channel planar buried heterostructure (MQW-DFB-DC-PBH LDs). Superior characteristics, such as narrow spectral linewidth (about 1 MHz) and flat FM response (several GHz bandwidth with less than 50-kHz dip frequency) at high light output power, have been obtained with small values of coupling coefficient and cavity length product (κL), and thick separate-confinement-heterostructure (SCH) layers. An estimated lifetime in terms of spectral linewidth, FM response, and lasing wavelength of over 105 has been obtained, demonstrating that these devices are suitable for practical use in gigabit/second coherent optical fiber communication systems

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Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 6 )