Abstract
We report an eight-channel reconfigurable optical add-drop multiplexers (ROADMs) based on cascaded microring resonators with low power-consumption and compact footprint. Microheaters are fabricated on top of the microring resonators, which can be modulated through the thermo-optic effect to achieve the reconfigurability of the device. We demonstrate the reconfigurable add-drop multiplexing functionality with the channel spacings of 100GHz and 50GHz, with the channel centre wavelengths aligned to the International Telecommunication Unit (ITU) grid. The crosstalks for the two channel spacings are less than -22.5dB and -15.5dB, respectively. The tuning efficiency is about 4.854 mw/nm and the tuning speed is about 12.4 kHz.
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