I'm in a group trying to design an underwater optical communication system for a capstone project. For this system we are planning on using multiple high powered LEDs passing through a lens system, and a photodiode with a collector lens at the other end of the system.
- So far we have been trying to make this as realistic as possible, which means not making plane wave assumptions. Are there any simple models we can use for LEDs? (like a gaussian can be used for lasers)
- Following up on the previous question, if we plan on (need to) use multiple LEDs will we need to have multiple lenses so each is focused correctly on axis, or is there a type of lens that will allow an off axis light source to focus correctly?
- Finally, when the device is tipped off axis, we still would need to collect the light on the photodiode. Are there any types of lenses that will allow this? Maybe an aspherical lens.
Links to products that might satisfy the needs of what we're attempting would be greatly appreciated, but aren't necessary. Theoretical explanations are a must.