Application Cases

Experiment Name: Packaging and Testing of Semi-Embedded Optical Waveguide Resonators

Research Direction: After completing the coupling of semi-embedded optical waveguide resonators, packaging is necessary to protect the device, prevent contamination of the etched groove area by impurities such as dust, and avoid potential coupling interface loosening due to device movement during experiments.

Test Equipment: High-voltage amplifier, Signal generator, Oscilloscope, Photodetector, Narrow-linewidth semiconductor laser, etc.

Experimental Process:

Figure 1: Test system diagram for the semi-embedded optical waveguide resonator

A narrow-linewidth semiconductor laser was used to test the performance of the semi-embedded optical waveguide resonator. The test system, shown in Figure 1, mainly includes: a narrow-linewidth semiconductor laser, signal generator, high-voltage amplifier, semi-embedded optical waveguide resonator, photodetector, and oscilloscope. The laser emits light at a wavelength of 1550 nm and features wavelength tuning capability. The signal generator produces scanning signals for tuning the laser wavelength, while the high-voltage amplifier adjusts the gain and bias of these scanning signals to ensure the resonator's resonant frequency falls within the laser's tuning range. The signal generator outputs to the high-voltage amplifier, which then outputs to the laser. The laser has a wavelength tuning range of 20 pm. The wavelength-tuned light from the laser enters the semi-embedded optical waveguide resonator via an optical fiber. Light at wavelengths satisfying the resonance condition resonates within the cavity, and the output light from the resonator enters the photodetector for optical-to-electrical signal conversion, which is then displayed on the oscilloscope. The measured resonance curve of the semi-embedded optical waveguide resonator is shown in Figure 2.

Figure 2: Test curve of the semi-embedded optical waveguide resonator

Experimental Results:

In Figure 2, the yellow curve represents the sinusoidal scanning signal, and the purple curve shows the resonance curve of the semi-embedded optical waveguide resonator. The cursor tool of the oscilloscope was used to measure the full width at half maximum (FWHM) of the resonance curve. The voltage difference at the FWHM is 43.19 mV. Based on the tuning coefficient of the laser, the FWHM of the semi-embedded optical waveguide resonator is calculated to be 64.79 MHz. Therefore, the quality factor (Q-factor) of the resonator is 2.99 × 10⁶.

High-Voltage Amplifier Recommendation: ATA-2082

Figure: ATA-2082 High-Voltage Amplifier Specifications

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