[time-nuts] Photodiodes for high frequency OPLL

[Bruce Griffiths]

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.

Bruce

Attila Kinali wrote:
> Moin,
>
> On Sun, 31 Mar 2013 12:28:59 +1300
> Bruce Griffiths<bruce.griffiths at xtra.co.nz>  wrote:
>
>    
>> With a suitable low noise tunable LO (laser) the frequency spectrum
>> beyond the photodiode electrical bandwidth can be explored.
>>      
> I don't exactly get how the laser spectrum (line width?) can be
> exploited to go beyond the photodiode bandwidth?
> Could you explain that a little bit?
>
> 			Attila Kinali
>
>