laser communication

[ameyambekar]

1.im doing my final semister project where i have to transmit digital data using laser at a distance of about 1 Km . can any body suggest me how do i go about .

2. my second doubt is if am using a solar panel for laser receiver what effect will it have in sunlight.and if there is any noise how do i remove it ?

 

[pedroromanvr]

Optical-fiber cable is what you need. You can transmit data up to 7km, depending on the cable.

The Solar panel is ok only if the type of light you are sending through the cable is not the same as sun light (primary infrared). Removing noise can be done electrically (eg, converting light in electricity and applying a schmitt-trigger comparator to "filter" offsets)

 

[alec_t]

If you can't use optical fiber then a focussing reflector with a sensor at the focus will probably be needed.

 

[ronv]

We are missing a few details but If you can modulate the laser at 38KHZ I think I would use a TSOP sensor (like a tv) they will give you what you need. You will probably need a reflector So you can hit it from your distance.

 

[ronsimpson]

If you put the receiver in a black tube with a lens the receiver will only see light from a very small angle. This really helps with sun light.
Modulating the light at 30 to 40khz like RonV said helps is you have a filter on the receiver.