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Nonlinearity Mitigation for Coherent Ground-to-Satellite Optical Links

Stella Civelli, Marco Secondini, Luca Potì

TL;DR

Ground-to-satellite optical links using high-power amplifiers suffer from Kerr nonlinearity that limits launch power and throughput. The authors propose two DSP-based mitigations tailored to the HPOA regime: probabilistic amplitude shaping with sphere shaping using a very short block length $N=4$ and 4D mapping, and nonlinear phase rotation (NLPR) whose effect can be split between the transmitter and receiver. Simulation results show that LUT-based shaping provides significant shaping gains with negligible complexity, and NLPR—especially when split across TX and RX—yields up to $6$ dB additional acceptable link loss for a target GMI of $5$ bit/2D. Collectively, these methods enable higher launch powers and longer links for coherent ground-to-satellite optical uplinks with modest added complexity at the satellite station.

Abstract

We propose digital signal processing techniques for nonlinearity mitigation in high power optical amplifiers used in satellite communications. The acceptable link loss increases by 6dB with negligible complexity.

Nonlinearity Mitigation for Coherent Ground-to-Satellite Optical Links

TL;DR

Ground-to-satellite optical links using high-power amplifiers suffer from Kerr nonlinearity that limits launch power and throughput. The authors propose two DSP-based mitigations tailored to the HPOA regime: probabilistic amplitude shaping with sphere shaping using a very short block length and 4D mapping, and nonlinear phase rotation (NLPR) whose effect can be split between the transmitter and receiver. Simulation results show that LUT-based shaping provides significant shaping gains with negligible complexity, and NLPR—especially when split across TX and RX—yields up to dB additional acceptable link loss for a target GMI of bit/2D. Collectively, these methods enable higher launch powers and longer links for coherent ground-to-satellite optical uplinks with modest added complexity at the satellite station.

Abstract

We propose digital signal processing techniques for nonlinearity mitigation in high power optical amplifiers used in satellite communications. The acceptable link loss increases by 6dB with negligible complexity.
Paper Structure (4 sections, 1 figure)

This paper contains 4 sections, 1 figure.

Table of Contents

  1. Introduction
  2. Nonlinearity Mitigation Techniques for High Power Optical Amplifier
  3. System Setup and Performance
  4. Conclusion

Figures (1)

  • Figure 1: (a) System setup, (b) system performance