Low Half-Wave Voltage in Hybrid Silicon/Polymer Waveguide Modulators for ECG Signal Acquisition
IEEE Photonics Technology Letters
As an electro-optic signal modulation device, the Mach-Zehnder (MZ) electro-optic modulator has potential applications in electrocardiogram (ECG) weak signal modulation. We propose a hybrid silicon/polymer asymmetric MZ electro-optic modulator that has the advantages of low half-wave voltages and low loss. The proposed modulator functions in the 1550 nm band, and it is mainly composed of two 3 dB multimode interference couplers, a bent waveguide, a modulation waveguide and a phase shifter. The loss of the multimode interference coupler is -0.43 dB at a device size of 4 μm ×19.3μm. The core device size is 160 μm ×700 μm. The initial working state of the modulator is in the linear region, which can directly realize the linear modulation of voltage. Under the simulation condition of γ33 =18.3 pm/V, the results show that the modulator has a low loss of -3.4 dB and a low half-wave voltage amplitude of 3.0 V.
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