How do I draw fiber-optic lines in a schematic?

I'm not sure there is a convention, but I've use a line with two adjacent ohs "OO" on top of the line and terminate with some sort of arrow to indicate its direction. This will obviously be some sort of graphics as opposed to an actual net.

________ OO__> (imagine that the line is continuous underneath the two ohs and that the arrow is centered on the line end)

Bob

Yes, that would be an option. Just wondering whether there are some unspoken rules about this.

google says: TIA-587, but it cost money to see what it is

-Lasse

How about regular lines, but with little lambdas alongside?

Or dotted/dashed lines? With an appropriate note somewhere.

John

Well, yes, I can do all those. But I don't know what's customary in the trade since I haven't done many FO projects until it all started last year.

And Lasse, thanks but I won't buy a freaking expensive standard printed in umpteen languages just to find out ;-)

I wouldn't either :)

when I get to work I have access to a university internet connecting they might have a subscription so I can check it out

you could try a university library

-Lasse

I would use what Aligent (HP) use on their transmitters/receivers application notes or spec sheets.

Cheers

Thanks, but only if it's quick and easy to find out.

Well, the next one is almost an hour drive away and I don't have access there. Ordering via our local library would take a long time if they do standards at all (I doubt they would).

notes or spec sheets.

So far I've only seen short pieces in "tube style" there, but no stuff integrated in circuits. This board will have FO lines that are functionally integrated. At least the real estate of a family-sized pizza.

| > I would use what Aligent (HP) use on their transmitters/receivers application notes or spec sheets. | >

| | So far I've only seen short pieces in "tube style" there, but no stuff | integrated in circuits. This board will have FO lines that are | functionally integrated. At least the real estate of a family-sized pizza. | | -- | Regards, Joerg |

The circle with arrows seems to be in an IEC standard. IEC117

Of course you need to buy the standard to find out.

Cheers

notes or spec sheets.

Yes, they are quite proliferant with optical links in their gear.

GE FANUC too.

From IEEE315-1975

-- Mark

Thanks, Mark! I guess that settles it then. Gotta make a double-arrow symbol now but with Cadsoft Eagle graphics stuff is fairly easy. One just has to plug the ears when the ERC horn blares (it doesn't like lines going through parts). Or I'll try a bitmap import.

Personally, i just use normal lines interrupted with circles with double arrows inside.

How are "waveguide" links in microwave transmitters drawn schematically, yet not included on layout netlists?

That is so-o-o-o-o IEEE... ugh :-(

...Jim Thompson

Most of the implementations that i have seen "interrupt" the line for the circle. Better CAD systems can incorporate the circle as part of a line pattern.