Home » Broadband Speed » Currently Reading:

Potential Optical Fiber Breakthrough: New Spin Lasers Might Deliver 240 Gigabits Per Second

Phillip Dampier April 18, 2019 Broadband Speed 1 Comment

Circular polarization (Image courtesy of: Dave3457)

German researchers are testing a new way of transferring data over optical fiber using a new laser polarization method that could boost the capacity of a single strand of fiber from 25 gigabits per second to as fast as 240 gigabits per second, while greatly reducing power consumption and heat.

The technique relies on oscillating polarization in the light beam instead of more traditional methods that rely on light intensity to transmit data. Current methods differentiate between digital “1s” and “0s” by using different light intensity.

“Normally, you make the throughput faster by pumping the laser harder, which automatically means you consume a lot of power and produce a lot of heat,” said Nils Gerhardt, chair of photonics and terahertz technology at Ruhr-University Bochum in Germany. “Which is actually a big problem for today’s server farms. But the bandwidth in our concept does not depend on the power consumption. We have the same bandwidth even [at] low currents.”

Using lower current means a less expensive power bill, particularly to remove excess heat generated from the high intensity beams of light sent across fiber cables in places like data centers. The new technique encodes a “1” as a burst of circularly polarized light that corkscrews to the left, while a “0” is represented by a burst of the same polarized light, only it corkscrews to the right. Right now, the technology is at the “proof of concept” stage in the lab, but the idea of light spinning has been around since at least 1997. The goal is to efficiently boost transmission capacity across optical fiber strands, which currently tops out at between 40-50 gigabits per second.

One of the benefits of optical fiber in fiber to the home applications is that it is considered almost infinitely upgradable, depending on laser transmission technology improvements. Currently, multiple strands of fiber are used in dedicated, very high-speed applications. If a provider uses all of its fiber strand capacity, it may have to divert excess traffic or lay down more fiber. Gerhardt’s technology could eventually expand existing fiber strand capacity by five times or more if it proves workable. But Gerhardt warns there is much research to complete, and he envisions the technology would be most useful initially in server farms and data centers, where cable lengths are shorter and heat concerns are greater. The technology would have to prove itself before being considered for internet backbone applications.

Competing technologies that could come to market before Gerhardt’s method include “mode-locked semiconductor laser diodes” and “quantum cascade lasers,” but neither have been successful much above 100 gigabits per second.

1
Leave a Reply

avatar
1 Comment threads
0 Thread replies
0 Followers
 
Most reacted comment
Hottest comment thread
1 Comment authors
L. Nova Recent comment authors

This site uses Akismet to reduce spam. Learn how your comment data is processed.

  Subscribe  
newest oldest most voted
Notify of
L. Nova
Guest
L. Nova

I remember reading about lasers being developed to replace the light signals currently in fiber optic communication lines. This is progress.

Search This Site:

Contributions:

Recent Comments:

  • Mike: Maybe your Line filters are bad. Any phone plugged into a jack will require line filter. Just a suggestion....
  • Vanessa Tomblin: Copper is so obsolete but you can’t explain to some ppl they need to complain to the fcc to get things done!...
  • Kay Tomblin: Exactly they have given stimulus money several times w The buying of frontier from Verizon and now grants which they if used on customers at all are ...
  • Bill Denham: Their service is a joke. It's out more then it's in. The price is not worth it. Total crap service....
  • Deborah: I bought my system once it was under Spectrum . I am pissed . I’m sure there will be a law suit . They can add me to there list . I chose though to g...
  • James R Curry: Steve Burke really creating some buzz for the service there, talking about "Shareholder value" by the third sentence. My hand involuntarily reached f...
  • Person: You don't need to use their equipment. Toss it in the closet and lock it away. That's what I do....
  • Ryan Faley: Pretty much...
  • shishir c babu: First of all there was no preparatory time given to the subscribers about the change.I came to know of it only in the first week of January!! Second t...
  • Alan Rodin: If there is a class action lawsuit over this count me in. I am very irate over having around $1000 of hardware go to waste. Why cant they recommend a ...
  • Berfunkle: Next week, I'm getting fiber to the home Internet from Ontario and Trumansburg Telephone Companies. $80/month for 500/500 Internet compared to what Sp...
  • James Dan Dee: Who has similar service and better pricing? My rates keep going up, for no reason....

Your Account: