Semiconductor ring lasers (SRL) have received growing interest because of their potential as compact and coherent light source. Although intensive effort has been invested into the bistability of SRL under continuous wave operation, very little research has been conducted on the direct modulation of SRL[1]. We report the direct modulation of SRL at bit rates up to 1.5Gb/s. The experimental results show that the DC bias current is the key factor for direct modulation.

© 2011 Optical Society of America

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