Abstract
For future applications of semiconductor lasers in LAN/SAN, to increase the maximum achievable bit rate at room temperature becomes the ultimate goal and challenge, while the importance of the high temperature stability of the laser properties plays a smaller role, as compared to application for on-chip, chip-to-chip and module-to-module data transmission. From the other side, there are optical standards which define the wavelength of 850 nm to be used for data transmission in LAN/SAN, thus the freedom to choose any desired wavelength is no more present. Consequently, to meet the requirements for the future LAN/SAN optical data transmission, cheap and robust VCSELs emitting around 850 nm with the highest possible data transmission bit rate should be realized. According to the coming standards, lasers with the bit rate of 30 Gbit/s and larger are necessary in the next several years. Additionally, optics is coming also to shorter distances and in the near future definitively will replace copper-based data transmission lines for such application like, for example, data communication between a personal computer and portable devices (USB stick, mp3 player, etc.), between computer and monitor, between TV and player, etc. These application fields require semiconductor lasers capable to a very cheap mass production, and VCSELs are practically the only suitable candidates.
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