MUNICH, Germany Data speeds of up to 40 GBit/s can be achieved with a technology developed by Berlin-based startup company VI Systems GmbH. The proposal will be presented at the Ethernet Alliance Forum in September.
According to VI Systems, the presentation will discuss several approaches to use duplex multimode fiber for 40 GBit/s and even 100 GBit/s data transmission. As a key component of this approach is a ultra high speed 850nm VCSEL, the company said. In addition, the startup has developed a set of optical components and ICs for such applications.
While speeds of up to 40 GBit/s can be reached with a single signal channel, using direct modulated VCSEL, for higher speed the VI Systems engineers propose to use several lines in parallel. For instance, in order to achieve a bandwidth of 100 GBit/s, four lines could be switched in parallel with each one using 25 GBit/s coarse wavelength division multiplexing (CWDM) in the wavelength range of 850 nm over duplex OM3 multimode fiber. An alternative would be 2 x 50 Gbit/s CWDM over OM4 multimode fiber, with OM4 being an enhanced class of multimode optical fiber currently under definition by the Telecommunications Industry Association (TIA).
These approaches aim at applications in future data centers. Experts believe that the on-board I/O speed of high-end servers associated to progress in the semiconductor industry will drastically increase, driving the need for high-speed interconnects.
VI Systems intends to present its ideas at the 'Life Beyond IEEE P802.3ba' forum which will take place in San Josť (California) on September 15. The IEEE P802.3ba standard is expected to be ratified in June 2010, but VI believes that further work on the physical layer will be seen.
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