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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

Spectrally efficient optical orthogonal frequency division multiplexing.

Arthur James Lowery¹

¹Department of Electrical and Computer Systems Engineering, Monash University, Clayton, Victoria 3800, Australia.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|March 3, 2020

Summary

This summary is machine-generated.

Researchers developed spectrally efficient optical orthogonal frequency division multiplexing (OFDM) for optical wireless communications. Layered techniques overcome clipping distortion, significantly boosting spectral efficiency and improving signal-to-noise ratios for high-bandwidth systems.

Keywords:

direct detection intensity modulation optical communications orthogonal frequency division multiplexing spectral efficiency

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Area of Science:

Optical Communications
Signal Processing
Wireless Technologies

Background:

Intensity-modulated direct detection (IM/DD) systems require non-negative optical signals.
Traditional DC-biased optical OFDM is energy-inefficient.
Asymmetric clipping in optical OFDM introduces distortion, reducing spectral efficiency.

Purpose of the Study:

To develop spectrally efficient optical OFDM for IM/DD systems.
To overcome distortion issues caused by signal clipping.
To enhance spectral efficiency and signal-to-noise ratio (SNR) in optical communication systems.

Main Methods:

Development of spectrally efficient optical OFDM variants.
Implementation of layered techniques to cancel clipping distortion at the receiver.
Utilizing knowledge from unpolluted signal layers to recover distorted subcarriers.
Efficient generation of multiple signal layers using Fast Fourier Transforms (FFTs).

Main Results:

Layered optical OFDM methods significantly improve spectral efficiency.
These methods achieve the best spectral efficiencies for a given optical power and high-order modulation.
Layered techniques require the lowest signal-to-noise ratios, especially with diversity combining.
Experimental demonstrations confirm effectiveness in wireless and short-haul optical links.

Conclusions:

Layered optical OFDM is crucial for high-bandwidth optical fiber systems.
These techniques offer superior spectral efficiency and SNR performance.
The advancements pave the way for more efficient optical wireless communication.