Hi all,
I have to carry a 10 MHz standard frequency signal inside an EMC
screened room via fiber optic cable.
Not willing to re-invent the wheel, do something like an optical
standard frequency link exist on the market?
I think it is possible to use standard 100MB LAN transceivers, and
POF. Ph
On Mon, 24 Nov 2008 17:33:25 -0800, "Tom Van Baak" <[EMAIL PROTECTED]> wrote:
>> Yes. I know of several commecial systems. If you only need to do a short
>> jump, then using fairly basic E/O-O/E equipment should work well
>> enought. It all depends if you want/can to roll your own or need to buy
It's actually [1]http://www.bb-elec.com for those looking.
Bill Ezell
--
They said 'Windows or better'
so I used Linux.
Neon John wrote:
On Mon, 24 Nov 2008 17:33:25 -0800, "Tom Van Baak" [2]<[EMAIL PROTECTED]> wrot
e:
Yes. I know of several commecial systems. If you only need t
It's regular Heliax that's been temperature-conditioned by repeated
temp cycling to minimize dielectric size change vs temperature. This
minimizes phase shift over length. The cycling affects the foam used
as the dielectric, which apparently eventually stops expanding and
contractin
On 12/5/08 3:48 AM, "Neon John" <[EMAIL PROTECTED]> wrote:
> On Mon, 24 Nov 2008 17:33:25 -0800, "Tom Van Baak" <[EMAIL PROTECTED]> wrote:
>
>>> Yes. I know of several commecial systems. If you only need to do a short
>>> jump, then using fairly basic E/O-O/E equipment should work well
>>> enou
f the room.
Dave
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Marco IK1ODO -2
Sent: 24 November 2008 15:31
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] 10 MHz over optical fiber?
Hi all,
I have to carry a 10 MHz sta
In message <[EMAIL PROTECTED]>, Marco IK1ODO -2 writes:
>Hi all,
>
>I have to carry a 10 MHz standard frequency signal inside an EMC
>screened room via fiber optic cable.
>
>Not willing to re-invent the wheel, do something like an optical
>standard frequency link exist on the market?
>I think it
At 16.41 24/11/2008, you wrote:
>Why fibre optic? You'll only need to convert back to copper when you get it
>in there (unless the kit that needs the 10Mhz reference has optical 10MHz
>in), and if you do that you may as well just take it in there using high
>quality coax (say RG-400U) and a bulkhe
>HParchive.org has a service note that explains how to use that for
>reference frequency distribution.
See:
http://www.hparchive.com/Bench_Briefs/HP-Bench-Briefs-1985-06-08.pdf
from page 4
Peter
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To un
I'm looking for the same thing, but between buildings over singlemode
fiber. I have not evaluated any of these but I've been looking at:
http://www.terahertztechnologies.com
http://www.highlandtechnology.com/
http://www.luxlink.com/
Scott
Marco IK1ODO -2 wrote:
> Hi all,
>
> I have to
L PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Scott Mace
> Sent: Monday, November 24, 2008 8:37 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10 MHz over optical fiber?
>
> I'm looking for the same thing, but between building
54-2075 phone
> +1(818)393-6875 fax
>
>> -Original Message-
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] On Behalf Of Scott Mace
>> Sent: Monday, November 24, 2008 8:37 AM
>> To: Discussion of precise time and frequency measurement
>> Subj
You might look at video fiber optic transmitter/receiver. I used one
once to carry a certain telemetry signal for the same reasons your are
looking for. The fiber optics were analog in this case and rated from
30 hz to 10 Mhz at 1 volt P-P. We had to attenuate the signal going
into the tra
Hi Marco ,
You might try firecoms if it's not too hot in there. (plastic)
Steve
--- On Mon, 11/24/08, Marco IK1ODO -2 <[EMAIL PROTECTED]> wrote:
From: Marco IK1ODO -2 <[EMAIL PROTECTED]>
Subject: [time-nuts] 10 MHz over optical fiber?
To: "Discussi
Thanks to all for the quick answers and all the info. As usual,
time-nuts is a great resource :-)
Marco IK1ODO
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and follow th
Marco IK1ODO -2 skrev:
> Hi all,
>
> I have to carry a 10 MHz standard frequency signal inside an EMC
> screened room via fiber optic cable.
>
> Not willing to re-invent the wheel, do something like an optical
> standard frequency link exist on the market?
Yes. I know of several commecial syst
> Yes. I know of several commecial systems. If you only need to do a short
> jump, then using fairly basic E/O-O/E equipment should work well
> enought. It all depends if you want/can to roll your own or need to buy
> a finished product (aka "buy this, and you will be fine!").
Magnus, what's th
Hi;
This may fit your needs, Wenzel made a 10MHz reference that was
disciplined thru fiber. I am currently using one. It could be easily
modified to use battery power. It had very low phase noise.
Thomas Knox
NIST
4475 Whitney Place
Boulder Colorado 80305
1-303-554-0307
[EMAIL PROTECTED]
Quo
Hi everyone,
In message <[EMAIL PROTECTED]>, Marco IK1ODO -2
writes:
>Hi all,
>
>I have to carry a 10 MHz standard frequency signal inside an EMC
>screened room via fiber optic cable.
>
>Not willing to re-invent the wheel, do something like an optical
>standard frequency link exist on the market
In looking at the off-the-shelf boxes, jitter seemed to vary from ps range
to tens of ns. Also, how stable is the 34km of fiber... One of the
manufacturers I looked at had a 1550nm option, so it's probably not a stretch
to get it on a 100GHz ITU grid channel or other CWDM channel.
Scott
> > I'm looking into something similar: transmitting an H-Maser signal
> > (probably 10MHz) over some 34km using CWDM SFPs. At first
> glance this
> > seems fairly uncomplicated: get some SFPs, and SFP
> connector + cage.
> > Use a fast opamp/differential driver to drive the transmitting SFP,
> > a
to:[EMAIL PROTECTED] On Behalf Of Scott Mace
> Sent: Tuesday, November 25, 2008 1:42 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10 MHz over optical fiber?
>
> In looking at the off-the-shelf boxes, jitter seemed to vary
> from ps rang
Hi Didier, everyone,
Didier wrote:
> By the time you get the signal from the maser through 34 km of fiber optic,
> what you get at the end might be not better than a decent GPSDO...
That's exactly what I'm trying to work out before I'll actually start
building something like that. The JPL device
mitsu, PhD, MBA
+1-609-638-5402
--- On Wed, 11/26/08, Paul Boven <[EMAIL PROTECTED]> wrote:
From: Paul Boven <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] 10 MHz over optical fiber?
To: "Discussion of precise time and frequency measurement"
Date: Wednesday, November 26
[EMAIL PROTECTED] wrote:
> All: Sorry for jumping in abruptly on this ongoing thread. I have been
> meaning to chime in ever since the discussion got started.
>
> I apologize in advance if I am dragging up an issue that has already been
> discussed and put to rest.
>
> That being said, have
, 11/26/08, Bruce Griffiths <[EMAIL PROTECTED]> wrote:
From: Bruce Griffiths <[EMAIL PROTECTED]>
Subject: Re: [time-nuts] 10 MHz over optical fiber?
To: "Discussion of precise time and frequency measurement"
Date: Wednesday, November 26, 2008, 2:13 PM
[EMAIL PROTECTED] wr
Hi Group;
It seems to me that the increase in noise introduced with an
optoelectronic device would not matter in most applications if a
cleanup oscillator is added.
Best Wishes;
Thomas Knox
NIST
4475 Whitney Place
Boulder Colorado 80305
1-303-554-0307
[EMAIL PROTECTED]
Quoting "Paul Boven"
[EMAIL PROTECTED]
> Sent: Wednesday, November 26, 2008 2:50 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10 MHz over optical fiber?
>
> Hi Group;
> It seems to me that the increase in noise introduced with an
> optoelectronic device
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
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
>> th
Scott Mace wrote:
> 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
>
Most of it may be buried, however the ends of the fiber run may not be.
There are expensive fib
From the corning leaf spec:
Environmental Test Induced Attenuation
Condition (dB/km)
1550 nm /1625 nm
Temperature Dependence
-60°C to +85°C* ? 0.05
Temperature Humidity Cycling
-10°C to +85°C* and up to
98% RH ? 0.05
Water Immersion, +23°C ? 0.05
Heat Aging, +85°C* ? 0.05
*Reference Temperature
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Griffiths
> Sent: Wednesday, November 26, 2008 6:56 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10 MHz over optical fiber?
Tom Van Baak wrote:
>> Yes. I know of several commecial systems. If you only need to do a short
>> jump, then using fairly basic E/O-O/E equipment should work well
>> enought. It all depends if you want/can to roll your own or need to buy
>> a finished product (aka "buy this, and you will be fin
Tom Van Baak skrev:
>> Yes. I know of several commecial systems. If you only need to do a short
>> jump, then using fairly basic E/O-O/E equipment should work well
>> enought. It all depends if you want/can to roll your own or need to buy
>> a finished product (aka "buy this, and you will be fin
Paul Boven skrev:
> Hi everyone,
>
> In message <[EMAIL PROTECTED]>, Marco IK1ODO -2
> writes:
>> Hi all,
>>
>> I have to carry a 10 MHz standard frequency signal inside an EMC
>> screened room via fiber optic cable.
>>
>> Not willing to re-invent the wheel, do something like an optical
>> stand
Paul Boven skrev:
> Hi Didier, everyone,
>
> Didier wrote:
>> By the time you get the signal from the maser through 34 km of fiber optic,
>> what you get at the end might be not better than a decent GPSDO...
>
> That's exactly what I'm trying to work out before I'll actually start
> building some
On Fri, 2008-11-28 at 02:50 +0100, Magnus Danielson wrote:
> Consider also things like laser gyroscopes. The stability of the fiber
> is sufficient to detect even small shifts frequency due to Sagnac effect.
Usually called FOGs (Fiber Optic Gyroscope), where the other "laser"
type, no fibers he
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