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

[Didier Juges]

Bruce,

The more I read the specs, the more obvious it becomes. I did not 
realize how jittery these things are.

I am still trying to get more info on how clean the LO has to be, but I 
am pretty sure it will be close to telecom specs.

Thanks,

Didier

Dr Bruce Griffiths wrote:
> 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
>
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