[time-nuts] OT: transfer of 3 GHz via fiber optic
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Tue Feb 20 15:31:54 EST 2007
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
> 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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Without a cleanup PLL the project is dead in the water.
The photonic link will be too noisy for just about any application
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