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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Optical orthogonal chirp division multiplexing with chirp index modulation.

Kunping Luo, Guo-Wei Lu, Zhouyi Hu

|February 14, 2025

Summary

We introduce Orthogonal Chirp Division Multiplexing with Chirp Index Modulation (OCDM-CIM), a novel technique reducing interference and energy consumption. This method enhances spectral efficiency, energy efficiency, and data rates compared to traditional OFDM systems.

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Quasi-light Storage for Optical Data Packets

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Published on: February 6, 2014

Area of Science:

Optical communications
Signal processing
Information theory

Background:

Orthogonal Frequency Division Multiplexing (OFDM) is a standard modulation technique.
Index modulation (IM) enhances energy efficiency but can increase interference.
Orthogonal Chirp Division Multiplexing (OCDM) offers interference rejection through chirp-spread spectrum.

Purpose of the Study:

To propose and demonstrate a novel modulation technique, OCDM-CIM, combining OCDM and IM.
To achieve a superior trade-off among spectral efficiency (SE), energy efficiency (EE), and performance.
To reduce interference and energy consumption in optical communication systems.

Main Methods:

Developing and implementing Orthogonal Chirp Division Multiplexing with Chirp Index Modulation (OCDM-CIM).
Utilizing unmodulated partial chirps to minimize interference and power usage.
Introducing a distributed subblocking strategy for enhanced coding and diversity gains.

Main Results:

OCDM-CIM reduces peak-to-average power ratio by 2.5 dB compared to OFDM with subcarrier index modulation.
Optical receiver sensitivity is enhanced by 2.7 dB.
Achievable bitrate increases by 8.7 Gbps at a 3.8 × 10^-3 bit error rate.
Achieves a 25% improvement in EE over OCDM at the same SE.

Conclusions:

OCDM-CIM offers significant advantages over conventional OFDM-IM.
The technique provides flexibility in adapting to system requirements through adjustable chirp usage.
OCDM-CIM presents a promising solution for high-performance, energy-efficient optical communication.