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Bandwidth improvement for slow light using amplification characteristics of cascaded vertical-cavity surface-emitting lasers

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Abstract

A scheme to improve the bandwidth of slow light using cascaded vertical-cavity surface-emitting lasers (VCSELs) is proposed and experimentally demonstrated. In the scheme, a proper adjustment on the gain peaks of two cascaded VCSELs enables the generation of the desired composite gain spectrum, which has flat-top gain and delay profiles with enhanced peak values. By employing the improved gain and delay profiles in a slow light system, a large delay can be achieved within a wider bandwidth. In the experiment, by using two cascaded VCSELs, a tunable slow light up to 135 ps for a 5Gbits/s pseudorandom binary sequence is demonstrated with relatively low signal distortion.

© 2013 Optical Society of America

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