Does anyone know if any Single Mode QSFPs exist on the market that use wavelengths other than 1310nm (either self tunable or factory tuned)? I am looking to put more than one 40gb link on a fiber pair similar to using DWDM OADMs for 1g & 10g but can't seem to find any qsfp optics that don't use 1310nm.
Thanks.
Regards,
Mitchell T. Lewis
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QSFPs generally output 4 lanes of traffic. Either 4 channels at 10G or 4 channels at 25G. So unless you find an optic that can do single-channel OTN at 100G, you’re probably going to have a hard time plugging them into a DWDM shelf.
Does anyone know if any Single Mode QSFPs exist on the market that use wavelengths other than 1310nm (either self tunable or factory tuned)?
I am looking to put more than one 40gb link on a fiber pair similar to using DWDM OADMs for 1g & 10g but can't seem to find any qsfp optics that don't use 1310nm.
I've probed our optics vendor about this in the past when trying to achieve something similar. Although they state 1310nm, they actually run at 4 different 10G wavelengths (one of which is 1310) and as such are not suitable for Mux/Demuxing.
I believe the 40g and 100g optics are already muxing 4 channels within the transceiver before outputting it to 1310.
https://community.fs.com/blog/40gbase-lr4-qsfp-transceiver-links-cwdm-and-psm.html
Luke Guillory
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Let me clarify a bit-I understand that 40GBase-LR4 uses 4 10g wavelengths(lanes) which typically are:
1264.5- 1277.5 nm
1284.5–1297.5 nm
1304.5–1317.5 nm
1324.5–1337.5 nm
My question is are there any vendors that make optics which 4 wavelengths(lanes) are something other than those typically used by 40GBase-LR4?
Regards,
Mitchell T. Lewis
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They still leave the transceiver as a single 1310, the lanes color isn't ever expose since the mux takes place within the transceiver. When I looked into this for 40g and 100g I found no way to passively do it.
Luke Guillory
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So you weren't able to find anyone that uses different lane colors?(As an example 1550). I am not looking to mux alongside 10g waves, I am just looking to put 3 or 4 on a single fiber pair.
Regards,
Mitchell T. Lewis
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No, though the lane colors are irrelevant since we only care about the final output color. Why the lanes can’t be muxed into another output color I’m not sure, I can only find specs listed for the lanes but nothing for the final mux leaving the transceiver.
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It is a bummer, if 40/100g optics existed that used 1550 or some other color than those could be muxed onto same fiber pair as 1310 optic (The method for passively doing that extraneous to this conversation.
Regards,
Mitchell T. Lewis
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Did 40GBASE-FR ever catch on? It was supposed to be single-lane serial 40Gbps on 1310nm with the receiver also accepting 1550nm.
For that matter, what are all the optical transport folks using for ~40Gbps OTU3? Or did they all just skip that and go straight to ~100Gbps OTU4 on coherent optics (which are fairly readily available albeit in CFP, not QSFP).
Luke,
Can you link a document that corroborates this? I can only find ones that
show it as 4 separate lanes and 4 separate colors, visible on the actual
output.
Example:
https://www.nanog.org/meetings/nanog44/presentations/Monday/Hankins_100gbe_update_N44.pdf
slide
11
This is also what I've observed anecdotally, but there could be other
explanations, I am admittedly not an expert.
Seeing that it seems I’m misunderstanding things, so I went grab a meter and checked what was leaving. Both of the 100g SFPs were only outputting on 1310, while the 40g showed each of the 4 lanes.
100GBASE-LR4 QSFP28 Transceiver Module (SMF, 1310nm, 10km, LC, DOM)
Optical Components DML 1310nm
Juniper 100GBASE-ER4, Showing 1310 as the only color leaving.
Parameter
100GBASE-ER4
Optical interface
Single-mode
Standard
IEEE 802.3ba-2010
Maximum distance
SMF cable, 40 km (24.9 miles)
Transmitter wavelength per lane
1294.53 through 1296.59 nm
1299.02 through 1301.09 nm
1303.54 through 1305.63 nm
1308.09 through 1310.19 nm
40GBASE-LR4 Compatible 40GBASE-LR4 QSFP+ Transceiver Module (SMF, 1310nm, 10km, LC, DOM)
Optical Components DFB CWDM
[cid:image001.jpg@01D407E0.78FB4970]
IIRC, the lambda spacing for 100GBASE-LR4 is tighter than 40GBASE-LR4. 40G is spaced on the normal 20nm CWDM grid. 100G is spaced tighter at just under 5nm so that the entire thing mostly fits within the 20nm-wide "1310nm" CWDM grid. If you're using a CWDM meter, it'll probably bin it exactly that way.
There's a separate non-IEEE "100GBASE-CWDM4" that has the 20nm lambda spacing like 40G does.
Seeing that it seems I’m misunderstanding things, so I went grab a meter
and checked what was leaving. Both of the 100g SFPs were only outputting on
1310, while the 40g showed each of the 4 lanes.
Thanks much for checking - I didn't have a meter handy. I certainly
learned something about the tighter spacing of 100G colors.
Inphi ColorZ? They aren't tunable but you can order a variety of different wavelengths in the 15xx nm range.
Wes Felter
now hiring cloud DCI DWDM operators in Austin/NYC/Boston
This little bad-boy has the wavelengths (I believe all exactly 1310.00nm) broken out onto individual fibers (MTP/MPO)
https://www.fs.com/products/37016.html
Combine with: https://www.fs.com/products/30515.html and 4 DWDM SFP+ modules, plus 4 standard 10G LR SFP+.
Receiver sensitivity kind of sucks, but regen/amps should make interesting deployments possible with standard gear.
-Ben.
Hi Mitchell,
Does anyone know if any Single Mode QSFPs exist on the market that
use wavelengths other than 1310nm (either self tunable or factory
tuned)?
I found none.
I am looking to put more than one 40gb link on a fiber pair
similar to using DWDM OADMs for 1g & 10g but can't seem to find any
qsfp optics that don't use 1310nm.
I' considering the use of a circulator to do 40/100G over a single strand.
Do you think that would work ? Would it solve four problem ?
https://www.fs.com/products/33364.html
Best regards,