[time-nuts] OT: transfer of 3 GHz via fiber optic

[Dr Bruce Griffiths]

Didier Juges wrote:
> This is for a price sensitive commercial application, not a science 
> project and he is trying to minimize the amount of hardware at the far 
> end for cost and maintenance reasons.
> A cleanup PLL becomes very costly when dealing with a frequency agile 
> system.
>
> Thanks
>
> Didier
>
> Hal Murray wrote:
>   
>>> A friend of mine wants to send a 3 GHz LO signal up a fiber optic cable.
>>>     
>>>       
>> How crazy is your friend?  What's wrong with a cleanup PLL?
>>
>> As Bruce said, the people I know of who are good in that area are the radio 
>> astronomers.  They need timing (phase) stability rather than just frequency, 
>> so their problem may be harder than yours.
>>
>> Beware: time sink alert.  His references are fun reading.
>>
>>
>>
>>   
>>     
>
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>   
Didier

Without a cleanup PLL the project is dead in the water.
The photonic link will be too noisy for just about any application 
imagineable.

Bruce