A 1 × 2 plasmonic demultiplexer with a rectangular metal-insulator-metal (MIM) waveguide comprising one input port and two output ports has been proposed. The proposed demultiplexer is based on the principle of interference of surface plasmon polariton waves. By placing the output port at the designed position along the rectangular MIM waveguide, the desired wavelength can be extracted from the mixture of the wavelengths. Results were simulated using finite element method (FEM) technique and plot of field and its intensity were obtained for both the wavelengths. The results agree with the proposed theory. Power transmission of more than 80% at the desired port with a suppression of more than 90% at the undesired port is obtained for both the wavelengths. A low crosstalk of less than −11.06 dB with a low insertion loss of less than 14.32 dB are measured. It is shown that the wavelength selectivity of the plasmonic demultiplexer is further dependent on the width of the MIM waveguide as well as the materials chosen. The design can be further extended to a 1×N demultiplexer by appropriate selection of position of the output ports.
We report the results of a bilateral comparison of attenuation measurements between the National Physical Laboratory (NPLI, New Delhi) and the Standards and Calibration Laboratory (SCL, Hong Kong), carried out under the Asia-Pacific Metrology Programme. Commercial 50 coaxial attenuators (in APC-7 connectors), of nominal attenuation values 3 dB, 10 dB and 20 dB, were calibrated at 30 MHz, 5 GHz and 10 GHz against the 30 MHz standard WBCO attenuators of both laboratories. A direct 30 MHz series-substitution technique and a 30 MHz intermediate-frequency substitution technique were employed at the NPLI to calibrate attenuators at 30 MHz and microwave frequencies using a VM-3 attenuator and signal calibrator, respectively. The same techniques were used at the SCL in association with a vector signal analyser (HP-89441A). The expanded uncertainty as measured at the NPLI, quoted at the 95 % confidence level for the attenuation range 3 dB to 20 dB, varies from 0.007 dB to 0.015 dB at 30 MHz, 0.017 dB to 0.032 dB at 5 GHz, and 0.020 dB to 0.037 dB at 10 GHz. The uncertainty reported by the SCL for the same attenuation range is approximately 0.010 dB at 30 MHz and varies from 0.010 dB to 0.016 dB at 5 GHz, and 0.016 dB to 0.023 dB at 10 GHz. The mean values of the measured attenuation of both laboratories were found to lie within the quoted limits of the uncertainties.
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