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On-chip all-optical quantizer based on the cross polarization modulation effect in a double-ridge a-Si:H-Si3N4
Applied Optics
|February 24, 2022
Summary
This study introduces a novel all-optical quantizer using a silicon nitride waveguide for all-optical analog-to-digital conversion. It achieves 16-level quantization with a 3.79-bit effective number of bits, crucial for optical communication.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
- Electrical Engineering
Background:
- All-optical quantizers are essential for all-optical analog-to-digital conversion.
- These devices are critical for advancing optical communication and signal processing.
- Existing methods face limitations in speed and integration.
Purpose of the Study:
- To propose a novel all-optical quantization scheme.
- To leverage the cross-polarization modulation effect in a specific waveguide.
- To achieve high-resolution all-optical analog-to-digital conversion.
Main Methods:
- Utilizing a double-ridge a-Si:H-Si3N4 waveguide.
- Simulating the cross-polarization modulation effect.
- Optimizing waveguide parameters for nonlinear effects and low loss.
Main Results:
- Achieved a maximum nonlinear coefficient of 2680.5 m^-1 W^-1.
- Obtained a transmission loss of 2.246 dB/cm at the probe wavelength.
- Generated a nonlinear phase shift of 8π with 0.8 W pump power.
- Demonstrated 16-level quantization with a 4-bit resolution and 3.79 effective bits.
Conclusions:
- The proposed all-optical quantizer shows promise for ultrafast optical signal processing.
- The scheme offers a viable path towards high-performance all-optical analog-to-digital converters.
- The results are close to ideal resolution, indicating significant potential.
