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The design of rat-race hybrid that can operate at two widely separated frequency bands is presented. The junction reactance is considered in the design process. The final circuit has an asymmetrical structure. The proposed circuit features high isolation, wide bandwidth (lager than 300MHz at low operating frequency band and 250MHz at high operating frequency band). For validation, both simulated and...
A new wide-band microstrip phase inverter is reported in this paper. The interdigital striplines, defected ground and vias are used to obtain 180° phase shift. The structure is simple and can be realized with ordinary microwave integrated circuit(MIC) fabrication process. The lumped-element model of the phase shifter is devised to facilitate parameter optimization. The fabricated phase inverter has...
We propose and demonstrate a bandwidth-efficient overlay scheme in which a DSB (500 Mb/s) or SSB (1 Gb/s) OFDM-based video signal is superimposed over a 1.25 Gb/s times N WDM PON. Selective delivery is achieved by simply controlling individual transmitter laser biases at the central office. For subscribed customers, the optimal bias condition was obtained by observing power penalty changes for the...
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