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aasif bashir dar
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hi fayiqa,
DMLs called as directly modulated lasers… will provide you got results for very long link as compared to EMLs
EMLS called as externally modulated lasers.. will provide overall better quality for small links as compared to DMLs

you are taking about PON networks wich have ususlly small range

it is better to use EMLS

with regards

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