All-Fiber Micro-Ring Resonator Based p-Si/n-ITO Heterojunction Electro-Optic Modulator.

Area of Science:

• Photonics
• Materials Science
• Electrical Engineering

Background:

• Increasing data demands necessitate advancements in optical modulators.
• Silicon electro-optic modulators face challenges balancing modulation efficiency and bandwidth due to weak electro-optic effects.
• Existing designs often suffer from coupling and insertion losses.

Purpose of the Study:

• To propose a novel electro-optic modulator design overcoming the limitations of silicon-based devices.
• To achieve high modulation efficiency and large bandwidth in an all-fiber configuration.
• To leverage the epsilon-near-zero (ENZ) effect of Indium Tin Oxide (ITO) for enhanced modulation.

Main Methods:

• Development of an all-fiber micro-ring resonator.
• Integration of a p-Si/n-ITO heterojunction for electro-optic modulation.
• Utilizing the carrier concentration-dependent refractive index changes in ITO under reverse bias.

Main Results:

• The proposed modulator demonstrates significant phase shifts at low voltages.
• Achieved a high modulation efficiency of 3.08 nm/V.
• Reached a substantial bandwidth of 82.04 GHz.
• Eliminated spatial optical-waveguide coupling losses inherent in silicon modulators.

Conclusions:

• The novel all-fiber micro-ring resonator and p-Si/n-ITO heterojunction modulator offers superior performance compared to traditional silicon modulators.
• The design effectively addresses high insertion loss and integration challenges.
• This technology shows significant potential for future high-speed optical chip applications.