Article View: sci.electronics
Article #7224Re: Lasers for communication
From: William Lewis
Date: Thu, 13 Sep 1990 21:17
Date: Thu, 13 Sep 1990 21:17
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1535 bytes
In article <1990Sep13.020325.10622@nmt.edu> pahsnsr@nmt.edu (Paul A. Houle) writes:
> ... Controlling power input to the
>laser is also possible, but tends to add more noise and, for most models,
>you'll have to considerably modify the power supply. A final trick is to
>use a bit of mirror that you can vibrate to move the beam on and off the
>detector.
I have a HeNe laser that I'd like to use for communication also.
The tube itself has no provision for modulation, but the power supply
is seperate (built from a kit) so modifying it would be no problem.
My question is: how would I go about adding a modulator to the supply?
Do I just have to modulate the current? Does anyone have an example
schematic? I'm not well versed in high voltage electronics (high
voltage to me means "more than TTL levels" =8) )
--
wiml@milton.acs.washington.edu Seattle, Washington | No sig under
(William Lewis) | 47 41' 15" N 122 42' 58" W |||||||| construction
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!mit-eddie!wuarchive!julius.cs.uiuc.edu!apple!mips!cs.uoregon.edu!oregon!milton!wiml From: wiml@milton.u.washington.edu (William Lewis) Newsgroups: sci.electronics,sci.physics Subject: Re: Lasers for communication Message-ID: <7504@milton.u.washington.edu> Date: 13 Sep 90 21:17:26 GMT References: <1872@oucsace.cs.OHIOU.EDU> <153DAVE@ORION> <1990Sep13.020325.10622@nmt.edu> Organization: University of Washington, Seattle Lines: 19