Abstract
In this paper, we designed and fabricated a four-channel optical add-drop multiplexer (OADM) based on dual racetrack resonators. The size of the fabricated device is only 2400μm×500μm. The fabricated device can effectively and perfectly realize the signals upload and download. The free spectral range (FSR) of OADM is about 15.2nm. We take the spectral responses near 1555nm as an example. When the device acts as an optical drop multiplexer, the minimum insertion loss is 4.481dB and the maximum extinction ratio is 31.931dB. The maximum adjacent channels crosstalk is -9.845dB. When the device acts as an optical add multiplexer, the minimum insertion loss is 0.944dB and all of the extinction ratios are bigger than 25dB. The maximum crosstalk is -16.531dB which indicates the crosstalk can be neglected.
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