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All-optical single-sideband frequency upconversion utilizing the XPM effect in an SOA-MZI.

Doo-Ho Kim, Joo-Young Lee, Hyung-June Choi

|September 9, 2016

Summary

This study presents an all-optical single sideband (OSSB) frequency upconverter using cross-phase modulation (XPM) to eliminate power fading in radio-over-fiber systems. The novel device achieves stable signal transmission over 20 km without extra phase noise compensation.

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Area of Science:

Photonics and Optical Communications
Fiber Optic Systems
Signal Processing

Background:

Radio-over-fiber (RoF) systems face power fading due to chromatic dispersion.
Existing frequency upconversion methods require complex phase noise compensation.

Purpose of the Study:

To propose and demonstrate an all-optical single sideband (OSSB) frequency upconverter.
To overcome power fading and phase noise issues in RoF systems.

Main Methods:

Utilized cross-phase modulation (XPM) effect.
Employed an arrayed waveguide grating (AWG) and a semiconductor optical amplifier Mach-Zehnder interferometer (SOA-MZI).
Experimental demonstration over 20 km of single-mode fiber.

Main Results:

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Achieved a flat electrical radio frequency (RF) power response over fiber length.
Demonstrated negligible phase noise degradation for the upconverted 48 GHz RF signal.
Measured phase noise of -74.72 dBc/Hz at 10 kHz offset.
Obtained a spurious free dynamic range (SFDR) of 72.5 dB·Hz^2/3.

Conclusions:

The proposed OSSB frequency upconverter effectively mitigates power fading in RoF systems.
The device offers robust performance with minimal phase noise, eliminating the need for extra delay lines.
The technology shows promise for high-performance radio-over-fiber applications.