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

[Didier Juges]

Dr Bruce Griffiths wrote:
> Didier Juges wrote:
>   
>> 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
>>   
>>     
> Didier
>
> One of the biggest problems with RF over fibre (google ROF ) occurs when 
> the RF is modulated as the linearity of photonics systems isn't that great.
>
> Bruce
>   
Bruce,

I have read about this, noise performance also is not good for analog 
transmissions, causing very limited dynamic range.

That's probably why they use either FM or digital coding in just about 
all applications.

I just did not think the jitter would be so bad, even with a laser 
transmitter.

In my case, we are just trying to send a reference signal, but it must 
be clean, so unless a clean-up PLL is used, forget about fiber.

Thanks,

Didier