[time-nuts] Photodiodes for high frequency OPLL

[Bruce Griffiths]

Attila Kinali wrote:
> On Mon, 01 Apr 2013 09:08:51 +1300
> Bruce Griffiths<bruce.griffiths at xtra.co.nz>  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