nanog mailing list archives
Re: Low to Mid Range DWDM Platforms
From: Chad Lamb via NANOG <nanog () nanog org>
Date: Thu, 19 Oct 2023 13:24:53 -0700
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.
Current thread:
- Re: Low to Mid Range DWDM Platforms, (continued)
- Re: Low to Mid Range DWDM Platforms David Bass (Oct 06)
- Re: Low to Mid Range DWDM Platforms Mike Hammett (Oct 06)
- Re: Low to Mid Range DWDM Platforms David Bass (Oct 08)
- Re: Low to Mid Range DWDM Platforms Collin Rose (Oct 24)
- Re: Low to Mid Range DWDM Platforms michael brooks - ESC (Oct 09)
- Re: Low to Mid Range DWDM Platforms Ryan Hamel (Oct 06)
- Re: Low to Mid Range DWDM Platforms Joe Freeman (Oct 06)
- RE: Low to Mid Range DWDM Platforms Tim Burke (Oct 06)
- Re: Low to Mid Range DWDM Platforms Mark Tinka (Oct 06)
- Re: Low to Mid Range DWDM Platforms Mark Tinka (Oct 07)
- Re: Low to Mid Range DWDM Platforms Chad Lamb via NANOG (Oct 20)
- Re: Low to Mid Range DWDM Platforms Mark Tinka (Oct 20)
- Re: Low to Mid Range DWDM Platforms Mark Tinka (Oct 06)