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Related Experiment Video

Updated: May 25, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

MIMO-OFDM WDM PON with DM-VCSEL for femtocells application.

M B Othman¹, Lei Deng, Xiaodan Pang

¹DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, DK-2800, Kgs. Lyngby, Denmark. mabio@fotonik.dtu.dk

|January 26, 2012

Summary

This study demonstrates a 5.6-GHz radio-over-fiber system using MIMO-OFDM and VCSELs for femtocells. The system achieves error-free transmission, showing its potential for high-speed wireless indoor applications.

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Area of Science:

Optical communications
Wireless networking
Signal processing

Background:

Femtocells require high-speed, reliable wireless backhaul.
Radio-over-fiber (RoF) offers a solution for delivering high-frequency signals over long distances.
Directly modulated Vertical-Cavity Surface-Emitting Lasers (DM-VCSELs) are cost-effective light sources for RoF systems.

Purpose of the Study:

To experimentally demonstrate a 2x2 Multiple-Input Multiple-Output Orthogonal Frequency-Division Multiplexing (MIMO-OFDM) 5.6-GHz radio-over-fiber system.
To evaluate the system's performance for femtocell applications using DM-VCSELs over a Wavelength-Division Multiplexing Passive Optical Network (WDM-PON).
To investigate the impact of wireless transmission parameters on system performance.

Main Methods:

Implementation of a 2x2 MIMO-OFDM system operating at 5.6 GHz.
Utilizing DM-VCSELs for signal transmission over a 20 km WDM-PON.
Testing with 4-Quadrature Amplitude Modulation (4-QAM) and 16-QAM signals at various data rates and wireless path lengths.
Employing MIMO-OFDM algorithms to compensate for wireless link impairments.

Main Results:

Achieved error-free signal demodulation of 64 subcarrier 4-QAM signals at 198.5 Mb/s net data rate after 20 km fiber and 2 m indoor wireless transmission.
Reported a Bit Error Rate (BER) of 7x10⁻³ for 16-QAM signals at 397 Mb/s after 1 m wireless transmission.
Investigated the performance variations based on wireless transmission path length, antenna separation, and subcarrier count.

Conclusions:

The demonstrated MIMO-OFDM radio-over-fiber system is effective for femtocell applications.
DM-VCSELs are suitable for high-speed RoF systems in WDM-PON architectures.
MIMO-OFDM techniques successfully mitigate wireless channel impairments, enabling reliable high-data-rate transmission.