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The process of deriving the transfer function of a control system often involves reducing its block diagram to a single block. This simplification can be achieved through a series of strategic operations, including relocating branch points and comparators. These operations preserve the overall function of the system while allowing for easier manipulation and combination of blocks.
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Related Experiment Video

Updated: Jul 9, 2025

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Computationally efficient composite triple beat cancellation for DML-based DA-RoF fronthaul.

Yikun Zhang, Yixiao Zhu, Zijun Yan

|December 1, 2023

Summary

This study introduces a computationally efficient algorithm to cancel composite triple beat (CTB) distortions in digital-analog radio-over-fiber (DA-RoF) systems. The novel technique improves signal-to-noise ratio in low-cost directly modulated laser links without requiring training.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Area of Science:

Optical communications
Signal processing

Background:

Digital-analog radio-over-fiber (DA-RoF) is a promising solution for mobile fronthaul.
Directly modulated laser with direct detection (DML-DD) links face composite second-order (CSO) and composite triple beat (CTB) distortions due to chirp-dispersion interaction.

Purpose of the Study:

To propose and demonstrate a computationally efficient composite triple beat cancellation (CTB-C) algorithm for DA-RoF fronthaul.
To suppress CSO and CTB distortions in dispersion-uncompensated C-band DML-DD links.

Main Methods:

Developed a receiver-side digital signal processing (DSP) algorithm based on a theoretical model of nonlinear distortions.
Implemented and tested the CTB-C algorithm in a proof-of-concept experiment using a 1024-QAM OFDM signal over 10-km standard single-mode fiber (SSMF).

Main Results:

Achieved a 1.2-dB improvement in recovered signal-to-noise ratio (SNR).
Demonstrated effective suppression of CSO and CTB distortions.
The CTB-C technique showed performance comparable to Volterra-based feed-forward equalizer (VFE) under complexity constraints.

Conclusions:

The proposed CTB-C algorithm offers an efficient solution for mitigating nonlinear distortions in DA-RoF fronthaul systems.
This technique enhances the performance of low-cost DML-DD links without requiring a training process.