Active Optical Cables, Part 2

by Lisa Huff

(If you haven't seen Part 1, you can read it here.)

Avago Technologies (AVGO) had a late entry into the AOC market with its 10GBASE-CX4 replacement and QSFP+ products. But they have a rich history in parallel optics so have quickly come up to speed their products. While they may have been somewhat late to market, Avago has an existing customer base to peddle its wares to.

Finisar’s (FNSR) products include Quadwire and Cwire AOCs to address early adoption of 40G and 100G. Quadwire is Finisar’s mainstream product, both in terms of its use of the VCSEL arrays the company produces in volume at its Texas fab, and in terms of its use of the popular QSFP form factor.

The high end of the Finisar product line is designed to exploit anticipated interest in 100G Ethernet and 12-channel QDR InfiniBand. Cwire offers an aggregate data rate of 150 Gbps and a CXP interface. Not only does this represent the direction of high-end enterprise cluster design, but it allows Finisar to utilize the most integrated VCSEL arrays it manufactures. The 12-channel array also represents the most cost-effective per-laser manufacturing option, allowing Finisar to take advantage of its expertise in designing large VCSEL-arrays. The benefit in high channel count can also be seen in power dissipation. While the single serial channel of Laserwire dissipates 500mW per end, the 12-channel Cwire dissipates less than 3W per end – half the power dissipation per channel.

MergeOptics (now part of FCI) was born of the old Infineon which was once a powerhouse in the optical transceiver markets—both telecom and datacom. It emerged in 2006 with its SFP and then SFP+ products and is now one of the first entrants for 40G and 100G AOCs. Unlike most of its competitors, it is focused on 10G and above products so can bring them to market rather quickly. Its technology is being leveraged for InfiniBand and Ethernet applications.

Luxtera’s Contribution to All-Optical Networks

by Lisa Huff

Last week I wrote about Avago’s new miniaturized transmitters and receivers so today I’d like to introduce you to a similar product from privately-held Luxtera. Well known for its CMOS photonics technology, Luxtera actually introduced its OptoPHY transceivers first – in late 2009.

Luxtera took a different approach to its new high-density, optical interconnect solution. It is a transceiver module and is based on LW (1490nm) optics. Just like Avago’s devices, the transceivers use 12-fiber ribbon cables provided by Luxtera, but that’s really were the similarities end. The entire 10G–per-lane module only uses about 800mW compared to Avago's 3W, and they are true transceivers as opposed to separate transmitters and receivers. Luxtera is shipping its device to customers, but have not announced which ones yet.

In addition to the projected low cost for these devices, what should also be noted is that all of the solutions mentioned in the last three entries – Intel’s Light Peak; Avago’s MicroPOD and Luxtera’s OptoPHY – have moved away from the pluggable module product theme to board-mounted devices. This in and of itself may not seem significant until you think about why there were pluggable products to begin with. The original intent was to give OEMs and end users flexibility in design so they could use an electrical, SW optical or LW optical device in a port depending on what length of cable needed to be supported. You could also grow as you needed to – so only populate those ports required at the time of installation and add others when necessary. The need for this flexibility has seemed to have waned in recent years in favor of density, lower cost and lower power consumption. The majority of pluggable ports are now optical ones, so why not just move back to board-mounted products that can achieve the miniaturization, price points and lower power consumption?

Intel's Light Peak Optical Interconnect - Coming to Data Centers?

By Lisa Huff

Intel (INTC) made a big splash at its developer's forum in September 2009 by introducing its Light Peak technology. Light Peak uses a new controller chip with LOMF (Laser Optimized Multimode Fiber) and a 10G 850nm VCSEL-based module with a new optical interface connector, which has yet to be determined. It is aimed at replacing all of your external connectors on your PC including USB, IEEE 1394, HDMI, DP, PCIe, etc. It is also targeted at other consumer electronic devices like smart phones and MP3 players.

Intel designed both the controller chip and the optical module, but will only supply the chip. It is working with a couple of top optical component manufacturers on the modules—Avago (AVGO) and TDK. The semiconductor giant expects to ship its first products this year, but would not say who its initial customers will be. It did tell me that it has "received general support from the PC makers" and both SONY and Nokia have gone on record publicly supporting Light Peak. Both companies are willing to entertain a new standard centered on the Light Peak technology. These labors are expected to pay off with formal standardization starting this year.

According to Intel, Light Peak is expected to start shipping this year with several PC manufacturers evaluating it. Next year is anticipated to be a transitional year and by 2012, we should start seeing Light Peak commercially available on PCs. While I would never bet against Intel, this is quite an aggressive schedule. Even USB took longer than that to be adopted and it was a copper solution that was easily implemented by consumers. However, it sure would be nice to have just one connector for my PC!

While Intel says it has targeted this technology at consumers, with its 10G data rate and 100-meter optical reach, it could easily be extended to LAN and/or data center applications.