Abstract-In this letter, we demonstrate a simple technique for dispersion monitoring by adding a single inband subcarrier tone to the transmitted data signal. A measurable dispersion of up to 1200 ps/nm is demonstrated in a 10-Gb/s channel using a 7-9 GHz subcarrier and the addition of the subcarrier induced a power penalty of 0.5 dB. Dynamic ranges exceeding 20 dB and resolution sensitivities better than 10 (ps/nm)/dB are shown. With an 8-GHz tone and a 15% modulation depth for 10-Gb/s signals, we show a measurement range of 975 ps/nm with a 22-dB dynamic range. We used the monitor output signal to achieve accurate tunable dispersion compensation.

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Experimental results for microwave transmission losses of individual multi‐walled carbon nanotubes (MWNTs) are presented. Samples with MWNTs, as well as samples with‐out MWNTs, were fabricated with two types of electrode materials (Nb vs. Cr/Au) and configurations to compare AC transmissions loss as passive devices at room temperature. In the MWNT‐Nb samples, the transmitted current is higher and attenuation is lower than the MWNT‐Cr/Au samples. However, the transmission loss increases much faster in the Nb samples than Cr/Au samples with increasing frequency. Overall, their S ‐parameter measurements from 0.5 GHz to 110 GHz support frequency‐dependent microwave dissipation of the MWNTs and the metal‐electrode contact. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)