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Entries in coherent transmission (4)


Elenion's coherent and fibre-to-the-server plans

  • Elenion’s coherent chip - an integrated modulator-receiver assembly - is now generally available. 
  • The company has a silicon photonics design library that includes over 1,000 elements. 
  • Elenion is also developing an optical engine for client-side interfaces.

Elenion Technologies has given an update on its activities and strategy after announcing itself eight months ago. The silicon photonics-based specialist is backed by private equity firm, Marlin Equity Partners, which also owns systems vendor, Coriant. Elenion had already been active for two and a half years and shipping product when it emerged from its state of secrecy last December

Larry SchwerinElenion has since announced it is selling its telecom product, a coherent transceiver PIC, to Coriant and now other companies.

It has also progressed its optical engine design for the data centre that will soon be a product. Elenion has been working with Ethernet switch chip maker, Cavium, and data centre player, Microsoft, as part of its datacom work.

“We have moved forward,” says Larry Schwerin, the CEO of Elenion.

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Meeting the many needs of data centre interconnect

High capacity. Density. Power efficiency. Client-side optical interface choices. Coherent transmission. Direct detection. Open line system. Just some of the requirements vendors must offer to compete in the data centre interconnect market.

“A key lesson learned from all our interactions over the years is that there is no one-size-fits-all solution,” says Jörg-Peter Elbers, senior vice president of advanced technology, standards and IPR at ADVA Optical Networking. “What is important is that you have a portfolio to give customers what they need.”

 Jörg-Peter Elbers

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600-gigabit channels on a fibre by 2017

NeoPhotonics has announced an integrated coherent receiver that will enable 600-gigabit optical transmission using a single wavelength. A transmission capacity of 48 terabits over the fibre’s C-band is then possible using 80 such channels.

NeoPhotonics’ micro integrated coherent receiver operates at 64 gigabaud per second (Gbps), twice the symbol rate of deployed 100-gigabit optical transport systems and was detailed at the recent ECOC show.

Current 100Gbps coherent systems use polarisation-multiplexing, quadrature phase-shift keying (PM-QPSK) modulation operate at 32 gigabaud per second. “That is how you get four bits [per symbol],” says Ferris Lipscomb, vice president of marketing at NeoPhotonics.

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Ranovus developing DWDM links for the data centre

Ranovus has raised US $11 million in funding to develop Terabit capacity links for the data centre. The Ottawa-based start-up plans to use dense wavelength-division multiplexing (DWDM) technology to create huge data pipes that reduce significantly the power consumption, and cost, per bit.


Source: Gazettabyte


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