XKL is still here ...
Some caveats on 400G ZR/ZR+ devices:
- They are power hungry, cooling is a challenge. 800G even more so.
The OSFP package for 800G looks like the better choice than QSFP-DD for
this reason. We'll see, we need more mileage on this.
- For the ZR devices, not all vendors are equal. Some support 4x100GE
as well as 400GE, if that matters to you. Some have integrated BERT and
encryption, some do not.
- Do not plan on inter-operating different vendors of ZR+ devices. They
will interoperate only in ZR mode.
- Plenty of filter options out there if you are putting the ZR/ZR+ in
your router. I'll throw a plug in for the Coherent free space DWDM
filter. Free space technology has the best IL and isolation numbers.
Coherent hasn't packaged it in a module for easy racking yet (XKL can
provide that). So if you aren't adding an EDFA, the lowest IL you can
get helps your reach.
- If you have at least a few 400G channels, add an EDFA and use the Tx =
-10dBm devices, rather than the Tx = 0dBm devices. This is cost
effective. The EDFA also extends the reach considerably. You can
launch each channel up to +10dBm or more, for a modest number of
channels, without getting in trouble with fiber non-linearities
(four-wave mixing).
Chad
On 10/7/23 10:35 PM, Mark Tinka wrote:
Finally, the name came to me :-):
https://www.xkl.com/
Looks like they are still in business.
Mark.
On 10/6/23 16:02, Mark Tinka wrote:
On 10/6/23 15:52, Dave Bell wrote:
Smartoptics?
https://smartoptics.com/
Not them.
I want to say they had an "X" in their name, but memory is fuzzy.
Mark.
