New optical transmitter enables better communication networks

January 29, 2016

All the world's data – pictures, video, sounds, and text – has to traverse complex networks of optical fibers that crisscross cities, regions, and countries. To better handle the glut of information, a research team from NOKIA Bell Labs, have developed a new device that could become a crucial component of new flexible and optimized networks.

The device, a bandwidth variable transmitter (BVT), converts electronic signals to – but with a bandwidth that can change depending on need. And, it works without service interruptions, an advantage known as being "hitless."

"It's really the first transmitter that can transmit data in optical transmission networks with a bit rate change in a hitless way," said Arnaud Dupas, NOKIA Bell Labs, France. "As network demands continue to grow, this device will help to enable optical networks of the future with seamless network optimization and flexibility."

Dupas will be describing the device at The Optical Fiber Communication and Exhibition Conference (OFC), held 20-24 March in Anaheim, California, USA.

The growth of data traffic has required the development of elastic optical networks, which are flexible enough to handle a wide range of data types and transmission rates. But even without these networks, traffic is dynamic, depending on the time of day and changing demands.

Signals also don't simply travel from one point to another. Nodes in the networks have filtering functions that select and redirect signals, adding another level of variability. And, the networks themselves constantly evolve over time, as people add and change those filtering functions.

A transmitter that can adjust for varying bandwidths allows for optimized performance without requiring constant upgrades of infrastructure – which would be impractical and expensive.

Most BVTs work by changing the format of the optical signal, converting between digital and analog formats, Dupas said. But the researchers' new BVT instead changes the symbol rate, also known as Baud rate, which is the number of signal events transmitted per second (a single signal event can encode one or several bits of information).

The advantage of focusing on the symbol rate is that it's easier to implement with electronics and is cost-effective, Dupas explained. This approach incorporates smart processing and makes the transmitter hitless, allowing it to work without interruption and data loss. Normally, transmitters have to reconfigure themselves when interrupted, which can take several seconds or minutes and requires the traffic to be stopped. But the new transmitter can configure itself in less than 450 microseconds.

The device connects to a commercially available optical transport network switch, which aggregates all kinds of signals, such as video and audio, and puts it through the transmitter. It works at a bit rate between 10 and 107 Gigabits per second.

The BVT is still a prototype, and would be only one piece of a large flexible optical network. The next step, Dupas says, will be to test it in the field with network operators, integrating it with the management software and systems that control a from end-to-end.

Explore further: Delivering the Internet of the future—at the speed of light and open sourced

More information: Presentation: "Hitless 100 Gbit/s OTN Bandwidth Variable Transmitter for Software-Defined Networks," by A. Dupas, P. Layec, E. Dutisseuil, S. Bigo, S. Belotti, S. Misto, S. Annoni, Y. Yan, E. Hugues-Salas, G. Zervas, and D. Simeonidou

Related Stories

On the path to 1 terabit-per-second networks

March 1, 2012

As IP traffic continues to increase and the router interface rate extends beyond 100 gigabits-per-second (Gb/s), future optical networks—ones that would achieve unprecedented speeds of 1 terabit-per-second (Tb/s)—will ...

Improving the flow of the fibre optic freeway

March 25, 2013

Monash University researchers have played a pivotal role in the invention of an energy-efficient method of increasing the data capacity of optical networks to the point where all of the world's internet traffic could travel ...

World record: Wireless data transmission at 100 Gbit/s

October 14, 2013

Extension of cable-based telecommunication networks requires high investments in both conurbations and rural areas. Broadband data transmission via radio relay links might help to cross rivers, motorways or nature protection ...

See-through networks

March 19, 2010

(PhysOrg.com) -- Promising faster, more efficient and cheaper computer networking, transparent networks are the paradigm of the future. But thanks to European researchers, they are on their way already.

Recommended for you

Making AI systems that see the world as humans do

January 19, 2017

A Northwestern University team developed a new computational model that performs at human levels on a standard intelligence test. This work is an important step toward making artificial intelligence systems that see and understand ...

Firms push hydrogen as top green energy source

January 18, 2017

Over a dozen leading European and Asian firms have teamed up to promote the use of hydrogen as a clean fuel and cut the production of harmful gasses that lead to global warming.

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.