Ring resonator modulators reach high modulation efficiencies, are very compact and can be electrically driven as lumped elements. However, their limited optical bandwidth requires temperature stabilization, limiting their power efficiency. A novel ring assisted Mach-Zehnder modulator (MZM) aggressively reduces power consumption. Moreover, an integration scheme passively sets the 3 dB point during attachment of the input fiber relative to a multimode grating coupler used as the first splitter element of the interferometer. Straight phase shifters are replaced by arrays of highly overcoupled resonators maintaining a sufficiently high finesse and a substantial resonant enhancement while minimizing the excess losses at the resonator to waveguide junctions. A large resonance bandwidth compatible with thermal operation over 50 °C without dynamic compensation is obtained together with a factor larger than four in the reduction of power consumption relative to a conventional MZM.
Sebastian Romero-García, Alvaro Moscoso-Mártir, Saeed Sharif Azadeh, Bin Shen, Jovana Nojic, Florian Merget, and Jeremy Witzens, "Passively biased resonantly enhanced silicon photonics modulator with high optical bandwidth," Proc. SPIE 10108, Silicon Photonics XII, 1010802 (Presented at SPIE OPTO: January 30, 2017; Published: 13 March 2017); https://doi.org/10.1117/12.2253845.
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