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Wu T.Y.,National Metrology Center
Measurement: Journal of the International Measurement Confederation | Year: 2012

A dual-channel millimeter-wave attenuation measurement system from 75 GHz to 110 GHz using a heterodyne receiver is described. The millimeter-wave attenuation is derived from the voltage ratio at 5.02 kHz using an inductive voltage divider as a reference standard. The measurement uncertainties are estimated to be 0.015-0.030 dB for attenuation ranging from 0 dB to 70 dB at 110 GHz. Measurement results of a waveguide rotary vane attenuator with 0-70 dB attenuation steps at 110 GHz are presented. © 2012 Elsevier Ltd. All rights reserved. Source


Song J.H.,Institute of Microelectronics, Singapore | Zhang J.,Institute of Microelectronics, Singapore | Zhang J.,National Metrology Center | Zhang H.,Institute of Microelectronics, Singapore | And 2 more authors.
Optics Express | Year: 2011

We report a fully packaged silicon passive waveguide device designed for a tunable filter based on a ring-resonator. Polarization diversity circuits prevent polarization dependant issues in the silicon ring-resonator. For the device packaging, the YAG laser welding technique has been used for pigtailing both of the input and output fibers. Post welding misalignment was compensated by mechanical fine tuning using the seesaw effect via power monitoring. Packaging loss less than 1.5dB with respect to chip measurement has been achieved using 10 μm-curvature radius lensed fibers. In addition, the packaging process and the module performance are presented. © 2011 Optical Society of America. Source


Ng B.,Imperial College London | Ng B.,Data Storage Institute Singapore | Wu J.,National University of Singapore | Hanham S.M.,Imperial College London | And 6 more authors.
Advanced Optical Materials | Year: 2013

Spoof plasmon surfaces consisting of linear arrays of subwavelength grooves are proposed as a novel platform for THz sensing. The tightly confined spoof plasmons, coupled via an Otto prism setup, are sensitive to the refractive index of the dielectric filling the grooves. Phase jumps at spoof plasmon resonances are used as a readout response for refractive index sensing. An overall sensitivity of 0.49 THz RIU-1 with figures-of-merit as high as 49 are achieved. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Song J.H.,Institute of Microelectronics, Singapore | Song J.H.,IBM | Chang J.H.,Institute of Microelectronics, Singapore | Zhang J.,National Metrology Center | And 4 more authors.
IEEE Photonics Technology Letters | Year: 2012

A hybrid integrated receiver on grating coupler-embedded silicon platform is presented. The platform fabricated on silicon-on-insulator consists of two grating couplers as an input and output. The active silicon layer thickness, pitch, and depth are 220, 560, and 70 nm in the grating coupler on the platform, respectively. The photodiode is integrated on the output grating coupler directly. The measured responsivity is 0.02 A/W at a reverse bias of 33 V. The performance of the hybrid integrated receiver is dependent on that of the platform. An intrinsic responsivity of the integrated receiver is 0.0055 A/W, which is corresponding to the transmission loss of 20 dB in the grating coupler embedded platform. In addition, the platform using 340-nm-silicon layer wafer has been discussed for further improvement. © 2011 IEEE. Source


Wu T.Y.,National Metrology Center
Electronics Letters | Year: 2012

A 220-325GHz millimetre-wave phase-shift measurement system is described. The differential phase-shift measurement uncertainty is estimated to be 0.58°-1.32° for a 0-60dB rotary vane attenuator (RVA) at 325GHz. The phase-shift of a WR-03 waveguide shim is measured as a line standard to verify the system. Measurement results of a WR-03 RVA are also presented. © 2012 The Institution of Engineering and Technology. Source

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