Tomofumi Kise, Toshihito Suzuki, Masaki Funabashi, Kazuya Nagashima, Hideyuki Nasu


In recent years, the demand for the large capacity data transmission has been rapidly expanding in the data centers and the enterprise networks. For the purpose of short distance transmission such as the connection between racks, active optical cable (AOC) using a vertical cavity surface emitting laser (VCSEL) and multi-mode fiber (MMF) have been introduced. On the other hand, due to the increase in the size of data centers, more than 500 m transmission distance is required now, but in the case of conventional 850 nm VCSEL technology, the transmission distance is limited to about 100 m because of the effect of chromatic dispersion. We have been developing the VCSEL which operates at 28 Gb/s at the 1060 nm band where the high speed operation can be performed and the effect of chromatic dispersion is reduced. The optical link using the 1060 nm VCSEL mounted 4 channel parallel optical module and the 1060 nm optimized multi-mode fiber is constructed and the transmission characteristics were confirmed. Optical signals modulated by 28 Gb/s pseudo-random sequence 231-1 were transmitted. As a result, error free transmission was obtained even though the distance was 500 m. This technology is expected to be effective to support the optical transmission in the large scale data centers.

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