HIGH SPEED MODULATIONS BY USING POLARIZATION SWITCHING OF MICROCAVITY SURFACE EMITTING LASERS

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Massively integrated parallel optical devices are becoming important for use in future parallel optical fiber communication systems, optical interconnects, parallel optical recording and so on. Vertical cavity surface emitting lasers (VCSELs) have been attracting much interest for optical interconnects as well as for high speed parallel optical data links becouse of their low threshold and ease in optical coupling to fibers. The purpose of this study is to develop a novel technique of high speed modulation by using polarization switching of microcavity surface emitting lasers. The highlight of our results are in the following.1) We achieved the first demonstration of polarization control of VCSELs by using non- (100) substrates. Sub-milliamperes low threshold VCSELs grown on (311) A or (311) B substrates by either MOCVD or MBE were realized. The devices shows stable polarization operation with extinction ratio over 30dB under DC and high speed operations.2) We carried out the estimation of polarization selectivity of (311) -substrate VCSELs. Numerical simulation and experimental evaluation were carried out.3) We realized high speed operation of polarization controlled VCSELs beyond 10Gb/s.4) We fabricated and characterized quanrum wire structures by using the growth on patterned substrates. A few tens nm wide quantum wire structures were formed. The structure shows the anisotropy of PL characteristics, showing a potential of polarization control in VCSELs.5) We proposed a novel modulation scheme by using polarization switching in VCSELs with a potential of high speed modulation over 10Gb/s.