Attila Kinali wrote:
On Mon, 01 Apr 2013 09:08:51 +1300
Bruce Griffiths<[email protected]> wrote:
Nothing to do with laser line width.
Merely indicating that the photodiode mixer can be used with a suitable
LO to build an optical spectrum analyser front end.
Are you refering to heterodyne spectrum analyser?
Attila Kinali
Essentially, however if the photdiode has say a 1GHz bandwidth the LO
could be stepped in say 1GHz steps with subsequent circuitry providing
finer resolution.
Constructing an optoelectronic version of either an LSB or USB converter
may be interesting.
Bruce
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