HELLO DHIMAN..
Yes i agree to your point that its better to go for advanced modulation schemes.But the cost and complexity of such circuits is very high…I wish to achieve the same performance as provided by advanced schemes at much lower complexity and cost….Also my major focus is to achieve a high power budget for TWDM-PON Networks which can be achieved at high values of transmitter power.
And DMLs show an improved performance over externally modulated transmitters at very high levels of launch power…
Thanks & regards