Tag Archives: Fiber optics

Coherent optical turns 5


Ciena's 40G WaveLogic 2 line card, 2008 (Ciena)By Bo Gowan – To fully appreciate the impact that coherent optical technology has had on the telecom industry, you need to understand the barriers that optical vendors ran into as they looked to develop the next step in transport past 10G – and that story begins back in the go-go dot.com days of the late 1990s.

A team of engineers at Nortel had spent many weeks putting the finishing touches on a new optical transport demo unveiled on the company’s booth at Telecom 99.  The demo was an industry-first – transmitting 80 Gbps of data over a single wavelength of light across a span of 480 kilometers from Geneva to Paris – and it caught the attention of the entire industry.

In 2001, the huge optical boom came to a crashing end. Network operators had drastically overbuilt global fiber capacity during the dot.com bubble, and it would be years before spending on optical transport equipment would fully rebound. The demands coming from network operators changed in an instant for optical equipment vendors.

With new network builds no longer on the horizon, Dino DiPerna and his team knew that a completely new direction was needed.

What the team produced was not so much of a single change in optical transmission but an entire series of new optical transport concepts and inventions that together enabled what we know today as coherent optical transport.

“That first chip was the birth of what we now call WaveLogic, it was the first generation of DSP-assisted electro-optics,” said DiPerna. “Transmit digital compensation allowed the use of a traditional receiver design without the need for the customer to worry about dispersion. We knew we were on a path that represented the future of optical transport.”

But to achieve coherent 40G required a revolutionary set of new technologies and innovations that could all fit together in perfect compliment.

“That 40G coherent project was a great example of a diverse team coming together to solve a problem from all angles,” said DiPerna. “Individually, each technology advancement was impressive – whether it be the advanced DSP, the coherent receiver using DP QPSK, the analog-to-digital converter development, or a dozen other parts to the puzzle.” more> http://tinyurl.com/bleymmc

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Made in IBM Labs


IBM – IBM (NYSE: IBM) scientists developed a prototype optical chipset, dubbed “Holey Optochip”, that is the first parallel optical transceiver to transfer one trillion bits – one terabit – of information per second, the equivalent of downloading 500 high definition movies.

With the ability to move information at blazing speeds – eight times faster than parallel optical components available today – the breakthrough could transform how data is accessed, shared and used for a new era of communications, computing and entertainment. The raw speed of one transceiver is equivalent to the bandwidth consumed by 100,000 users at today’s typical 10 Mb/s high-speed internet access.

“Reaching the one trillion bit per second mark with the Holey Optochip marks IBM’s latest milestone to develop chip-scale transceivers that can handle the volume of traffic in the era of big data,” said IBM Researcher Clint Schow, part of the team that built the prototype. “We have been actively pursuing higher levels of integration, power efficiency and performance for all the optical components through packaging and circuit innovations. We aim to improve on the technology for commercialization in the next decade with the collaboration of manufacturing partners.”

Using a novel approach, scientists in IBM labs developed the Holey Optochip by fabricating 48 holes through a standard silicon CMOS chip. The holes allow optical access through the back of the chip to 24 receiver and 24 transmitter channels to produce an ultra-compact, high-performing and power-efficient optical module capable of record setting data transfer rates. more> http://is.gd/KXDPxY

Ciena Widens Leadership in High Speed Optics


English: A fiber optic splice lab being used t...

Image @Wikipedia

Ciena – Ciena® Corporation (NASDAQ: CIEN), the network specialist, today (Mar 1, 2012) announced WaveLogic™ 3, the industry’s first software-programmable coherent technology that scales to 400 Gb/s. This new generation of the company’s family of silicon chips will enable service providers to accelerate the move to dynamic, software-defined Terabit networking while improving network economics. Beyond scaling bandwidth and lowering costs, WaveLogic-powered networks can be programmed to quickly respond and adapt to changing requirements for capacity, reach and latency. The new technology that underpins Ciena’s WaveLogic 3 changes the game in optical networking by making the optical layer more intelligent and responsive to application needs—an increasingly critical requirement in today’s dynamic and cloud-centric networks.

Ciena’s new coherent optical processors help service providers extract more capacity out of existing fiber optic cables to facilitate transport of today’s increasingly bandwidth-hungry applications, improving network economics. WaveLogic 3 can carry multiple 100G payloads in metro and regional environments, doubling the capacity of current 100G networks. more> http://tinyurl.com/82ljgp7