Real-time Fourier-domain optical vector oscilloscope

Area of Science:

• Optoelectronics
• Telecommunications Engineering
• Signal Processing

Background:

• High-capacity telecommunications demand data rates exceeding 1 terabit per second per wavelength channel.
• Existing optical performance monitoring faces bandwidth limitations and synchronization challenges.
• Advanced optical multiplexing techniques exacerbate these monitoring difficulties.

Purpose of the Study:

• To address limitations in data acquisition and optical performance monitoring for high-capacity telecommunications.
• To develop a method for real-time full-field spectrum acquisition overcoming frequency limits.
• To enable precise characterization of complex optical signals.

Main Methods:

• Optically converting frequency limitations to an unlimited time axis.
• Employing chirped coherent detection for full-field spectrum retrieval.
• Demonstrating a real-time Fourier-domain optical vector oscilloscope.

Main Results:

• Achieved a 3.4-terahertz bandwidth and 280-femtosecond temporal resolution over a 520-picosecond record length.
• Successfully observed on-off keying (128 Gb/s) and quadrature phase-shift keying wavelength division-multiplexed signals (4 × 160 Gb/s) in real-time.
• Performed high-precision measurements on complex optical signals.

Conclusions:

• The developed optical vector oscilloscope overcomes bandwidth and synchronization limitations.
• This technology is a promising tool for high-speed optical communication systems.
• It offers significant potential for ultrafast optical measurement applications.