The dynamic linewidth enhancement factor, (alpha) , and damping rate, (Gamma) , for distributed feedback (DFB) lasers are obtained at various bias levels by measuring the frequency modulation and amplitude modulation indices of the lasers simultaneously. The (alpha) -value of a DFB lasers is generally reduced with increasing output power except at low bias, and the (Gamma) -value typically increases with output power. The measured results show that ninety percent of the 1.3-micrometers capped-mesa buried heterostructure DFB lasers have (alpha) -values in the range 4 to 7 and (Gamma) -values below 4 X 1010 s-1. The 1.3-micrometers lasers have smaller damping rates than the 1.5- micrometers lasers of the same DFB laser structure. Compared with buried heterostructure DFB lasers, multiquantum well (MQW) DFB lasers exhibit a much smaller (alpha) -value and a larger damping rate. For both unstrained and strained 1.5-micrometers MQW-DFB lasers, (alpha) -values as low as 1.5 can be easily realized for these lasers at high output power (>= 10 mW).


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    Title :

    Measurements of dynamic linewidth enhancement factor and damping rate for distributed-feedback lasers


    Contributors:

    Conference:

    Sources and Detectors for Fiber Communications ; 1992 ; Boston,MA,United States


    Published in:

    Publication date :

    1993-02-16





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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