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Related Experiment Video

Updated: May 25, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Simple feed-forward wide-range frequency offset estimator for optical coherent receivers.

J C M Diniz¹, J C R F de Oliveira, E S Rosa

¹Reconfigurable Optical Systems Laboratory, CPqD Foundation, SP-340 Highway, km 118.5, Campinas, SP, 13086- 902, Brazil. diniz@cpqd.com.br

|January 26, 2012

Summary

We developed a hardware-efficient frequency offset estimator for optical coherent receivers. This new method accurately estimates frequency offsets, even with signal filtering, meeting industry standards.

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Area of Science:

Optical Communications
Signal Processing

Background:

Digital Signal Processing (DSP) based optical coherent receivers are crucial for modern high-speed communication systems.
Accurate frequency offset estimation is essential for reliable data recovery in these systems.

Purpose of the Study:

To propose and demonstrate a novel, hardware-efficient frequency offset estimator for DSP-based optical coherent receivers.
To achieve a wide estimation range compliant with industry standards (OIF).

Main Methods:

The proposed estimator utilizes a simple relationship derived from the signal spectrum.
It is implemented in a feed-forward architecture for hardware efficiency.
Experimental validation was performed.

Main Results:

The estimator demonstrated a wide frequency offset estimation range, meeting OIF requirements.
It exhibited high tolerance to spectrum asymmetry introduced by electrical and optical filtering.
Performance was maintained even with return-to-zero pulse shaping.

Conclusions:

The developed frequency offset estimator is a practical and efficient solution for optical coherent receivers.
Its robustness to filtering effects makes it suitable for demanding communication scenarios.