Hi Karan,
The Laser’s rise time is the time required for laser output from 10% to 90% of total power.
Rise time is a factor that decides the 3db Bandwidth of the Laser. ( risetime = 0.35/BW )
So, for rise time = 35 ps. The BW = 1 Gbps.
In the layout attached, I directly modulated the Laser above 1Gbps and the output of laser showed absolutely no distortion.
I tried this with the analog signals also, but the result is the same.