I ordered a large number of laser modules that look like the following:

laser modules

When inspecting mine with a basic multimeter, I noticed a 90 ohm smd resistor is fitted on the module. I see no other components fitted on.

I tried searching for datasheets for different laser modules to get an idea on the maximum data rate these modules can produce, and so far I found one source online indicating its module (that looks like a large box with two beams) is 400hz maximum bandwidth (data rate).

I also found listings in the search engine indicating that some laser beams can go much faster than 400hz.

What is the actual specific name and unit number for these modules? I want to look the name up so I can get the datasheet and figure out the absolute maximum data rate I can use. (I'm doing slow data transmission through lasers as a test).

  • 6
    \$\begingroup\$ Umm... maybe ask whoever you ordered them from? It's highly unlikely that anyone can randomly give you a full part number from a picture... Of course, with a waveform generator and scope you can quickly figure this out on your own. \$\endgroup\$ – Selvek Aug 17 '18 at 2:59
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    \$\begingroup\$ If you want a laser that goes "much faster" you don't connect to it with a 10 cm wire. These are likely not intended to be modulated at all. But you might get 400 Hz or 100 kHz out of them---just try it. \$\endgroup\$ – The Photon Aug 17 '18 at 3:17
  • \$\begingroup\$ An LED might work as a detector. \$\endgroup\$ – mkeith Aug 17 '18 at 4:23
  • \$\begingroup\$ "I ordered a large number of laser modules" - what was the reason? \$\endgroup\$ – Andy aka Aug 17 '18 at 8:31

The baud rate you can squeeze out of a laser is wildly variant between lasers. Try contacting the company. You can also test it yourself if the company isn't helpful.


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