研究目的
To propose a new fiber alignment method for on-wafer testing of silicon photonic devices using PN junction embedded grating couplers to enable quick and easy search for optimum optical coupling positions.
研究成果
The proposed fiber alignment method using a PN junction embedded GC with multiplexed red and IR light enables efficient and accurate on-wafer testing by providing high S/N ratio and insensitivity to alignment parameters, which is beneficial for silicon photonic device production.
研究不足
The method may be limited by the specific device structure and fabrication process; potential areas for optimization include further reducing dark current and improving responsivity for broader applicability.
1：Experimental Design and Method Selection:
The study involves designing a measurement setup using a PN junction embedded grating coupler (GC) and a novel fiber alignment method with multiplexed red (635 nm) and IR (1550 nm) light. The method leverages the insensitivity of Si-PD responsivity to angle, wavelength, and polarization for high S/N ratio alignment.
2：Sample Selection and Data Sources:
Samples include silicon photonic devices with PN junction embedded GCs fabricated using ion implantation. Data is collected from in-plane scans and I-V characteristics measurements.
3：List of Experimental Equipment and Materials:
Equipment includes a single-mode fiber (SMF), red and IR light sources, bias voltage source, and measurement instruments for photocurrent and output power detection. Materials include the fabricated GC devices with electrodes.
4：Experimental Procedures and Operational Workflow:
The procedure involves rough alignment of SMF to GC using red light to monitor photocurrent (Iph), followed by fine optimization of angle, wavelength, and polarization using IR light to monitor output power (Pout). The vertical gap is set to 100 μm, and scans are performed in the x and y planes.
5：Data Analysis Methods:
Data analysis includes comparing signal profiles and S/N ratios from Iph and Pout measurements, using graphical representations and calculations of dynamic range and responsivity.
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