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laser receiver for laser communication

A

ameyambekar

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hi
i want to design a laser receiver for visible laser (red) ,for laser communication system . i want my laser to be omni-directional or at least it can receive fronm four to six sides one at a time . can any body suggest me the design for the receiver . please help ...in desperate need .....
 
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Guyfromhe

Guyfromhe

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I don't think most laser systems are omni... You could probably get some sort of lens that took a large area of light and focused it into a smaller area where you could put a photocell.
 
lasersbee

lasersbee

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ameyambekar said:
hi
i want to design a laser receiver for visible laser (red) ,for laser communication system . i want my laser to be omni-directional or at least it can receive fronm four to six sides one at a time . can any body suggest me the design for the receiver . please help ...in desperate need .....
Click to expand...

Why is your need so desperate.....:thinking:

What type of communication are you referring to....
Morse Code.... RS232 Digital Data.... Voice.... Video...ETC...:thinking:

What distances.... Indoor/Outdoor...:thinking:

Not enough info...
It's like saying.... my vehicle is broken... can you make it go...


Jerry
 
A

ameyambekar

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lasersbee said:
Why is your need so desperate.....:thinking:

What type of communication are you referring to....
Morse Code.... RS232 Digital Data.... Voice.... Video...ETC...:thinking:

What distances.... Indoor/Outdoor...:thinking:

Not enough info...
It's like saying.... my vehicle is broken... can you make it go...


Jerry
Click to expand...

thanx jerry for the reply . im looking for data communication on visible laser using OOK(on off keying modulation ) at the distance of about 1 Km(outdoor) .


i am also want to use a laser beam expander to make alignment of laser with the receiver easy . can you please guide me on this issue tooo....thanking you in antisipation

regards
amey ambekar
 
Ghostchrome

Ghostchrome

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I've always thought it'd be pretty cool to have a stereo system set up that uses lasers instead of wires to the speakers. I have no idea how to even start something like that. I never actually looked into it though heh. Maybe one day for a future project.
 
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chipdouglas

chipdouglas

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Ghostchrome said:
I've always thought it'd be pretty cool to have a stereo system set up that uses lasers instead of wires to the speakers. I have no idea how to even start something like that. I never actually looked into it though heh. Maybe one day for a future project.
Click to expand...


a few people here have done diy rigs but the sound quality is horrible.
 
chipdouglas

chipdouglas

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Ghostchrome said:
Awww man. :yabbem: Gotta be a way to improve the sound/bandwidth.



Cool, thanks. Going to check that out.
Click to expand...



I'm sure there is. with filters, amp, whatever. the ones i've seen are basically a small transformer, a photo diode a driver and a laser.


michael
 
Limecat

Limecat

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Ghostchrome said:
Awww man. :yabbem: Gotta be a way to improve the sound/bandwidth.



Cool, thanks. Going to check that out.
Click to expand...

Np. I was originally being cheeky, but I'm surprised you haven't heard of em. My computer is as old as 4 years now and on the back of my mobo there's a socket for optical fibre audio. If you have a home theatre system, it should have one too. Looks like an almost-square, gray flap that opens toward the inside of the device and has red light coming out of it. That's it :)
 
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NoiseBoy

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Ghostchrome said:
Awww man. :yabbem: Gotta be a way to improve the sound/bandwidth.



Cool, thanks. Going to check that out.
Click to expand...

There are ways around it for sure. I have no experience of lasers but im a radio ham and a qualified sound technician so im planning a project to get higher quality audio down a laser. I'd like to keep it analogue.

If you do a quick google there are very simple circuits for sending audio down a laser and receiving with a photocell, the problem is that with any daylight you get lots of noise. My plan is to use an accurate oscillator on the transmitter for the carrier and a sharp filter at the receiver so that you only 'take out' the signal from the laser and nothing else. It should'nt be too difficult to do.

The simplest thing is to put the photocell at the back of a dark box with a small hole in the front for the beam!
 
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