Laser Beams Deflected Off of Nothing but Air for First Time Ever in Breakthrough Patent Pending Process - The Debrief::An international team of scientists report that they have successfully used acoustics to deflect laser beams in an engineering first.

You are viewing a single thread.
View all comments View context
3 points

Oh yes, sure you can, 140 dB is 0.000014 MB. The confusing thing is just that the non-SI unit byte also uses the symbol “B” and uses the SI prefix “M” quite often.

Sometimes when I calculate optical power levels I actually use B in between. For example:

How much signal is 88 optical channels at 1.6 dBm of power each?

0 dBm = 1 mW by definition

1.6 dB = 0.16 B = log10 ( x ) --> x = 10 ^ 0.16 = 1.45

So 1.6 dBm is 1.45 * 1 mW = 1.45 mW

Then 88 channels is 88 * 1.45 mW = 127.60 mW = 127.60 * 1 mW

log10(127.60) = 2.11 B = 21.1 dB

So 127.20 mW is 21.1 dBm, just below the output specification of our amplifier, good, nothing should melt.

permalink
report
parent
reply

Technology

!technology@lemmy.world

Create post

This is a most excellent place for technology news and articles.


Our Rules


  1. Follow the lemmy.world rules.
  2. Only tech related content.
  3. Be excellent to each another!
  4. Mod approved content bots can post up to 10 articles per day.
  5. Threads asking for personal tech support may be deleted.
  6. Politics threads may be removed.
  7. No memes allowed as posts, OK to post as comments.
  8. Only approved bots from the list below, to ask if your bot can be added please contact us.
  9. Check for duplicates before posting, duplicates may be removed

Approved Bots


Community stats

  • 17K

    Monthly active users

  • 12K

    Posts

  • 543K

    Comments