[time-nuts] 10 MHz over optical fiber?

[Scott Mace]

I think for singlemode LEAF fiber you see something around 100ps/km per degree C.
Hopefully the fiber is buried and the temperature changes are more gradual.

	Scott




Bruce Griffiths wrote:
> Didier wrote:
>> If your concern is simply a stable frequency reference, that's true, even
>> though I am not sure what kind of cleanup oscillator would match the short
>> term stability of a maser. But also if you want to use it as a time
>> standard, the phase shift in the fiber has to be compensated, and it's
>> variations over temperature/humidity/gravity and whatnot must be accounted
>> for.
>>
>> This is time-nuts, we don't simply want to make things work, we want to make
>> them work good :-)
>>
>> Didier
>>
>>   
> Didier
> 
> A linear temperature ramp will create a linear ramp (equivalent to a
> frequency shift) in the fiber delay.
> Such temperature ramps may be expected at least twice a day. In other
> words the the rate of change of temperature needs to be low to preserve
> the frequency accuracy at the receive end of the fiber.
> 
> Bruce
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
> 
>