Electronics > Projects, Designs, and Technical Stuff

Looking for Cheap, Ultra Fast LEDs (2-3ns)

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supperman:

--- Quote from: Marco on January 29, 2020, 01:01:45 am ---
--- Quote from: StillTrying on January 28, 2020, 01:12:29 am ---I think if any one here knows much about switching normal LEDs and photodiodes at these speeds they're keeping it to themselves.

--- End quote ---

The standard fast'ish cheap photodiode is SFH2701 ... the Chinese must have low cost faster photodiodes though, they sell Fiber->CATV converters for a couple bucks.

PS. actually they seem to be cheap ROSAs, not loose photodiodes. Less useful.

--- End quote ---

Yes, that is the one I'm using.  2ns rise and fall for $0.22 at DigiKey in volume..

technix:

--- Quote from: supperman on January 28, 2020, 09:02:49 pm ---
--- Quote from: technix on January 28, 2020, 07:26:28 pm ---What for though? Is it ultra-fast display? Fiber optics?

If it is the former, I have nothing. If it is the latter, maybe you can use a ready-made module (TOSLINK transmitter for slower ones, SFP+ module for something that is real fast) and just focus on the digital logic part. If your source chip has serdes, it is likely you can get SFP+ would work with that.

--- End quote ---

This is for video transmission in a very specialized "air gaped" setup. I would just call it video.. not super fast or anything.. more than 1080p, less than 4k.. uncompressed.

--- End quote ---
If it is video, maybe HDBaseT over 10Gbps fiber?

StillTrying:
Has the OP managed to make a $0.50 400Mb/s opto isolator yet.  :)

supperman:

--- Quote from: StillTrying on February 01, 2020, 08:28:22 pm ---Has the OP managed to make a $0.50 400Mb/s opto isolator yet.  :)

--- End quote ---

I'm around 200mbit and around $1 for sender and receiver components. Still some stability issues. I'm optimistic to raise this speed up into the target range. Mostly I'm dealing with radiation.. so it is as much about PCB design as anything else. This of course does not count the two FPGAs on either end that have some useful i/o capabilities.

Again, I'm not here to debate if what I'm already doing can be done or not. I was asking about other LED components that may work better than what I got.. and it has lead to some interesting conversations.

StillTrying:

--- Quote from: supperman on February 02, 2020, 01:41:17 am ---Mostly I'm dealing with radiation.. so it is as much about PCB design as anything else.
--- End quote ---

I hope that wasn't a surprise!


--- Quote ---it has lead to some interesting conversations.
--- End quote ---

We don't need to know why/what the 1cm air gap is for, and you've given reasons why some solutions aren't useful, but without knowing what/if anything is useful I think some of us will be finding the conversations just frustrating. :)

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