OFDM promises compact Terabit transceivers

Source ECI Telecom

A one Terabit super-channel, crafted using orthogonal frequency-division multiplexing (OFDM), has been transmitted over a live network in Germany. The OFDM demonstration is the outcome of a three-year project conducted by the Tera Santa Consortium comprising Israeli companies and universities.

Current 100 Gig coherent networks use a single carrier for the optical transmission whereas OFDM imprints the transmitted data across multiple sub-carriers. OFDM is already used as a radio access technology, the Long Term Evolution (LTE) cellular standard being one example.

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Verizon on 100G+ optical transmission developments

Source: Gazettabyte

Feature: 100 Gig and Beyond. Part 1:

Verizon's Glenn Wellbrock discusses 100 Gig deployments and higher speed optical channel developments for long haul and metro. 

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Cisco Systems demonstrates 100 Gigabit technologies

* Cisco adds the CPAK transceiver to its mix of 100 Gigabit coherent and elastic core technologies
* Announces 100 Gigabit transmission over 4,800km

"CPAK helps accelerate the feasibility and cost points of deploying 100Gbps"

Stephen Liu, Cisco

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The uphill battle to keep pace with bandwidth demand

Relative traffic increase normalised to 2010 Source: IEEE

Optical component and system vendors will be increasingly challenged to meet the expected growth in bandwidth demand.

According to a recent comprehensive study by the IEEE (The IEEE 802.3 Industry Connections Ethernet Bandwidth Assessment report), bandwidth requirements are set to grow 10x by 2015 compared to demand in 2010, and a further 10x between 2015 and 2020. Meanwhile, the technical challenges are growing for the vendors developing optical transmission equipment and short-reach high-speed optical interfaces. 

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The CFP4 optical module to enable Terabit blades

The next-generation CFP modules - the CFP2 and CFP4 - promise to double and double again the number of 100 Gigabit-per-second (Gbps) optical module interfaces on a blade.

Using the CFP4, up to 16, 100Gbps modules will fit on a blade, a total line rate of 1.6 Terabits-per-second (Tbps). With a goal of a 60W total module power budget per blade, that equates to 27Gbps/W. In comparison, the power-efficient SFP+ achieves 10Gbps/W.

 

Source: Gazettabyte, Xilinx

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Terabit Consortium embraces OFDM

A project to develop optical networks using terabit light paths has been announced by a consortium of Israeli companies and universities. The Tera Santa Consortium will spend 3-5 years developing orthogonal frequency division multiplexing (OFDM)-based terabit optical networking equipment.

“This project is very challenging and very important”

Shai Stein, Tera Santa Consortium

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Infinera details Terabit PICs, 5x100G devices set for 2012

What has been announced?

Infinera has detailed Terabit coherent detection photonic integrated circuits (PICs). The pair - a transmitter and a receiver PIC – implement a ten-channel 100 Gigabit-per-second (Gbps) link using polarisation multiplexing quadrature phase-shift keying (PM-QPSK). The Infinera development work was describe in papers given at the OFC/NFOEC event held in Los Angeles.

Infinera recently demonstrated its 5x100Gbps PIC carrying traffic within Interoute Communications’ network. The 5x100Gbps PIC-based system will be available commercially in 2012.

 

“We think we can drive the system from where it is today – 8 Terabits-per-fibre - to around 25 Terabits-per-fibre”

Dave Welch, Infinera 

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