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The optical interconnection using polymer waveguides on the optical and electronic printed circuit board was designed and fabricated for low optical propagation loss and high speed data rate. The ray tracing simulation for the tolerance study of optical interconnection and fabrication was carried by the LightTools commercial software. In order for the easy fabrication and high position accuracy, the polymer waveguides were forming 45° reflective mirrors using dicing approach and followed by the e-beam deposition for silver coated 90° beam turning. The interface coupling loss was discussed in different polishing grit sizes and dicing approaches. Upto 12.5 Gb/s transmission rate and 0.1 dB/cm optical propagation loss were demonstrated in the board-embedded flexible polymer waveguide. The Q factor of 7.4 at 12.5 Gb/s and additional optical loss of 0.3 dB were experimentally shown on the 2-mm bending radius and 180° curvature angle. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1999–2003, 2013

A high-performance quadrature voltage-controlled oscillator (QVCO) with ring inductor is studied. The QVCO uses a closed-loop ring inductor and is composed of two complementary negative transconductance cells to replenish the energy loss due to the resistive LC resonator and is implemented in a standard TSMC 90 nm 1P9M CMOS technology. This QVCO operates between 7.05 and 8.15 GHz. The measured phase noise of the VCO operating at 8.15 GHz is −119.98 dBc/Hz at 1-MHz offset while the QVCO draws 4.2 mA and 3.57 mW consumption from a supply voltage of 0.85 V. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:839–842, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26714

The imbalanced Mach–Zehnder interferometer typically uses two multimode interferences individually connected with different path length for interferometric applications. When the optical loss difference between two phase arms is significant, the new splitting scheme using Mach–Zehnder based directional coupler could compensate loss discrepancy for higher extinction ratio and wavelength independence. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2950–2952, 2014