Abstract

We experimentally demonstrate linewidth-tolerant real-time 40-Gbits (10-Gsymbols) 16-quadrature amplitude modulation. We achieved bit-error rates of <109 using an external-cavity laser diode with a linewidth of 200kHz and <107 using a distributed-feedback laser diode with a linewidth of 30MHz, thanks to the phase-noise canceling capability provided by self-homodyne detection using a pilot carrier. Pre-equalization based on digital signal processing was employed to suppress intersymbol interference caused by the limited-frequency bandwidth of electrical components.

© 2009 Optical Society of America

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