Anonymous asked
Hey William, I am writing to you to gain some insight on Underwater optics. Its my final year project though research based I do have model the channel modeling in MATLAB. My question is:
Why to Choose a Laser Didoe than a LED as an underwater optical transmitter?
I would higly appreciate a response. Thank you for your time
Regards,
Rohan Kakade
Student at the University of Nottingham, UK
eexrk4"at"nottingham"dot"ac"dot"uk
Why to Choose a Laser Didoe than a LED as an underwater optical transmitter?
I would higly appreciate a response. Thank you for your time
Regards,
Rohan Kakade
Student at the University of Nottingham, UK
eexrk4"at"nottingham"dot"ac"dot"uk
Rohan,
It’s a complicated set of trade-offs. The biggest decider (in practice so far) seems to be the issue of pointing and tracking. This is (more) easy with a LED (or any diffuse source) than a highly colimated source like a laser. It’s up to the system designer to decide whether they want to spend money/power on better pointing and tracking or generating enough optical power with LEDs to transmit the required distance.
Source coherence seems to play little effect (so far) as the scattering from the channel destroys the coherence. You can check out this paper for more reference: http://www.mendeley.com/research/effects-underwater-turbulence-laser-beam-propagation-coupling-singlemode-optical-fiber-2
