Good morning, a detour this week from the original topic of this series Open networking( only for this week).
I am amazed by the progress of the optical industry from 100G/wavelength deployed in the year 2011 to 400G/wavelength deployed in the year 2017 and now with 800G lambda/wavelength being deployed starting the year 2020 (Some of the recent 800G deployment and announcements available in the reference section).
So whats' NEXT?? 1.2T /wavelength(a.k.a lambda)
There are two primary knobs that helped the industry to reach the 800G per wavelength capacity. First the use of coherent technology with higher modulation schemes and second increasing the baud rate(symbol/sec). However, physics does now allow us to play with these tools infinitely without paying a price :).
With higher modulation formats while we gain higher spectral efficiency, the reach of such link is limited(compared to another design with the same baud rate and lower modulation format). Read this document for further details.
On the other hand with a higher baud rate, long-distance(long haul/submarine) can be realized but the overall spectral width(which is proportional to the baud rate) required to transmit the channel is higher, thus limiting the total number of channels that can be packed on a fiber.
The industry is able to manage both these controls well and with improvement in FEC, DSP, mix modulation formats, and the real-world requirements, enabled combinations for the service providers to deal with the mind-boggling increase in bandwidth requirements.
1.2T(1200 Gb/s) will not be much different. Acacia demonstrated its 1200Gb/s module in ECOC 2019 using 64QAM modulation with a ~100GHz spectrum requirement( reach not known).
With 800G/wavelength in production now, it will be interesting to see the early leaders, developing and enabling network migration to 1.2T/wavelength.
Another interesting trend to watch: ill 1.2T/wavelength steal the thunder from 800G/wavelength (40GE vs 100GE)?
Surprisingly I was not able to find many public announcements for the 1.2T/wavelength available in the public domain. If you know more please leave a comment and I will update the post.
Have a good day
Reference:
Huawei and Turkcell 800G Trial
"Success is nothing more than a few simple disciplines, practiced every day"
- Jim Rohn
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