Integrated segmented IQ-modulator for orthogonal sampling and multi-level high-bandwidth signal generation

Area of Science:

• Optoelectronics
• Integrated Photonics
• Signal Processing

Background:

• Electronic signal processing faces limitations with high-bandwidth signals.
• Photonic-assisted signal processing offers a promising alternative.
• Integrated devices are crucial for compact and efficient communication systems.

Purpose of the Study:

• To present a compact, integrated photonic device combining digital-to-analog conversion (DAC) and optical IQ modulation.
• To demonstrate a novel approach for generating high-bandwidth signals using low-bandwidth electronic drivers.
• To validate the device's performance through simulation and proof-of-concept.

Main Methods:

• Development of a segmented Mach-Zehnder modulator concept.
• Implementation of orthogonal sampling techniques.
• Integration onto a silicon photonic platform.

Main Results:

• Successful generation of a 120 Gbps, 16-quadrature amplitude modulation (16-QAM) signal at 30 Gbaud.
• Demonstration of multi-level, high-bandwidth signal generation from low-bandwidth (5 GHz) non-return-to-zero (NRZ) signals.
• Proof-of-concept device with six segments validated through simulation.

Conclusions:

• The integrated photonic device offers a viable solution for high-bandwidth signal processing challenges.
• The design enables flexible speed and bandwidth operations suitable for diverse communication systems.
• This approach reduces the need for complex electronic components like pulse sources or electrical DACs.