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Multi-format signal generation using a frequency-tunable optoelectronic oscillator.

Yang Chen, Shifeng Liu, Shilong Pan

|February 7, 2018

Summary

This summary is machine-generated.

This study introduces a novel photonic approach for generating multiple signal formats using a tunable optoelectronic oscillator (OEO). The system efficiently produces frequency-multiplied and phase-coded microwave signals, and optical frequency combs.

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Area of Science:

Photonics
Optical Communications
Microwave Engineering

Background:

Optoelectronic oscillators (OEOs) are crucial for generating microwave signals.
Existing methods for multi-format signal generation can be complex and limited.
Developing compact and versatile photonic systems is essential for advanced signal processing.

Purpose of the Study:

To propose and demonstrate a novel photonic approach for multi-format signal generation.
To utilize a frequency-tunable optoelectronic oscillator (OEO) with a dual-polarization quadrature phase shift-keying (DP-QPSK) modulator.
To achieve flexible generation of frequency-multiplied microwave signals, phase-coded signals, and optical frequency combs.

Main Methods:

A frequency-tunable OEO incorporating a DP-QPSK modulator was designed.
The upper dual-parallel Mach-Zehnder modulator (DP-MZM) was configured as a phase modulator with a phase-shifted fiber Bragg grating (PS-FBG) acting as a band-pass filter.
The lower DP-MZM was employed for frequency multiplication, phase-coded signal generation, or optical frequency comb generation via different injection methods.

Main Results:

Tunable frequency-doubled and quadrupled microwave signals up to 40 GHz were generated without an optical notch filter.
Fundamental and frequency-doubled binary phase-coded microwave signals with tunable frequencies were produced.
Tunable five-line optical frequency combs were successfully generated using the compact system, without an external radio frequency (RF) source.

Conclusions:

The proposed photonic approach offers a versatile and compact solution for multi-format signal generation.
The system demonstrates efficient frequency multiplication, phase-coded signal generation, and optical frequency comb generation.
This OEO-based system provides a flexible platform for various applications in optical communications and signal processing.