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A design approach of Lange coupler for Si-substrate monolithic microwave integrated circuits is presented for frequency range up to 170 GHz. A combination of odd- and even-mode impedance theory and 3D EM simulation is proposed to improve the performance of Lange coupler. The value of the even number of the strip lines is determined based on the even-mode impedance calculation according to the process...
A novel design of monolithically integrated diplexers for FTTH applications is presented. A bi-level etched asymmetrical 2times2 optical coupler is analyzed for efficient couplings of both upstream and downstream signals.
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