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Single-pixel optical modulation analyzer based on phase retrieval for dual-polarization IQ modulators.

Yuki Yoshida, Setsuo Yoshida, Shoichiro Oda

|January 6, 2023

Summary

This study introduces an affordable method for monitoring dual-polarization IQ modulator imbalances in optical systems. The single-pixel optical modulation analyzer (SP-OMA) effectively estimates frequency-dependent IQ imbalances for advanced coherent transmission.

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Area of Science:

Optical communications
Signal processing
Photonics

Background:

Next-generation optical systems require in-service monitoring of analog imperfections.
IQ imbalance in optical IQ modulators is a critical analog impairment.
Existing methods for IQ imbalance monitoring can be costly or lack in-service capability.

Purpose of the Study:

To extend the single-pixel optical modulation analyzer (SP-OMA) for dual-polarization IQ modulators.
To develop a novel phase retrieval algorithm for simultaneous dual-polarization IQ imbalance estimation.
To enable affordable in-service monitoring of frequency-dependent IQ imbalances.

Main Methods:

Development of a novel phase retrieval algorithm utilizing an alternating minimization procedure.
Extension of the SP-OMA concept to dual-polarization optical modulators.
Numerical simulations and experimental validation using a 63.25-Gbaud DP-16QAM signal.

Main Results:

Simultaneous identification of frequency-dependent IQ imbalances on both polarization channels from a single photodetector output.
Demonstration of the SP-OMA's validity and feasibility for dual-polarization IQ modulators.
Successful characterization of IQ imbalances in a high-speed, dual-polarization system.

Conclusions:

The proposed SP-OMA with a novel phase retrieval algorithm is a viable solution for in-service monitoring of dual-polarization IQ modulators.
This technique offers an affordable and effective approach to compensate for analog imperfections in advanced optical transmission systems.
The method supports high-order modulation formats crucial for future high-capacity optical networks.