1 June 1994 External feedback sensitivity of 1.55-um gain-coupled multiquantum well DFB lasers
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We present experimental results showing a reduction of relative intensity noise (RIN) in partly gain-coupled InGaAsP/InP multiquantum-well DFB lasers. By comparing with conventional index-coupled lasers, it is found that even a small gain-coupling improves significantly the feedback insensitivity of DFB lasers. The mechanism of the RIN reduction and the less feedback sensitivity are believed to be a combined effect of the high relaxation frequency and heavy damping rate, the stronger internal mode discrimination, the facet reflectivity immunity, and the flatter carrier distribution in the gain-coupling structure.
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Guo Ping Li, Guo Ping Li, Toshi Makino, Toshi Makino, Hanh Lu, Hanh Lu, Jin Hong, Jin Hong, Wei-Ping Huang, Wei-Ping Huang, } "External feedback sensitivity of 1.55-um gain-coupled multiquantum well DFB lasers", Proc. SPIE 2148, Laser Diode Technology and Applications VI, (1 June 1994); doi: 10.1117/12.176620; https://doi.org/10.1117/12.176620

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