Silicon waveguide modulator based on carrier depletion in periodically interleaved pn junctions, Opt Express 17 (2009), 15947-15958.ABSTRACT: A novel compact microstrip dual-mode dual-band bandpass filter using two symmetrical twin-inductor resonators for I-band application is proposed. Double twin symmetrical rectangular-shaped inductors are connected with the stepped-impedance resonator terminals for matching 50 X impedance. The two twin-inductor ends are connected to ground with via connections. The two opposite inductors are joined and become twin-inductor structure that also behaves as an inductorinterdigital coupling. The combination of the two those twin-inductor interdigital structures give strong inductive couplings between the two ports and develop a fixed resonance frequency. This filter is designed to operate at 8.1 GHz and 10.7 GHz resonant frequency with a 20.98 and 13.08% effective bandwidth, respectively, at the 3-dB passband. More than 20 dB spurious suppression was measured in between two distinct bands. The measured insertion loss (S 21 ) was less than 1 dB recorded for both bands and return loss (S 11 ) was more than 21 dB measured at center operating frequencies of both bands. V C 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:638-641, 2012; View this article online at wileyonlinelibrary.com.

We report the demonstration of novel GaAs/AlGaAs integrated optical 1-to-N way beam splitters which use symmetric mode mixing in center-fed multimode planar waveguides. Each device has one single-mode input guide, a carefully chosen length of parallel sided multimode guide, and N equally spaced single-mode output guides. The mixing of symmetric modes shares the input light equally between the output guides by a symmetric form of the self-imaging process. We demonstrate experimentally that this type of beam splitter can be used to divide power equally, with high accuracy and low loss, between the N output guides, for values of N between 2 and 20.

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