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Frequency multiplying optoelectronic oscillator based on nonlinearly-coupled double loops.

Wei Xu, Tao Jin, Hao Chi

|February 12, 2014

Summary

This study introduces a novel frequency multiplying optoelectronic oscillator using cascaded Mach-Zehnder modulators. The device generates high-frequency microwave signals from low-frequency components, achieving excellent phase noise and side-mode suppression.

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Area of Science:

Photonics and Optoelectronics
Microwave Engineering
Signal Generation

Background:

Optoelectronic oscillators (OEOs) are crucial for generating stable microwave signals.
Traditional OEOs often require high-frequency components, limiting their practicality.
Generating high-frequency signals efficiently from low-frequency devices remains a challenge.

Purpose of the Study:

To propose and demonstrate a novel frequency multiplying optoelectronic oscillator (FMOEO).
To achieve high-frequency microwave signal generation using low-frequency devices.
To investigate the performance of the FMOEO in terms of phase noise and side-mode suppression.

Main Methods:

Utilizing a frequency multiplying optoelectronic oscillator architecture with nonlinearly-coupled double loops.
Employing two cascaded Mach-Zehnder modulators for signal modulation and multiplication.
Analyzing the influence of the master oscillation loop length on the final oscillation modes.
Experimental validation of the proposed FMOEO for generating 10 GHz and 20 GHz microwave signals.

Main Results:

Successfully generated microwave signals at 10 GHz and 20 GHz.
Achieved phase noise levels of -121 dBc/Hz at 10 kHz offset for 10 GHz signals.
Achieved phase noise levels of -112.8 dBc/Hz at 10 kHz offset for 20 GHz signals.
Obtained a maximum side-mode suppression ratio of 70 dB.

Conclusions:

The proposed frequency multiplying optoelectronic oscillator effectively generates high-frequency microwave signals using low-frequency components.
The oscillation modes are primarily determined by the master loop length, offering design flexibility.
The demonstrated performance, including low phase noise and high side-mode suppression, highlights the potential of this approach for advanced microwave applications.