Coherent Optical Data Transmission With DC-Balanced Pilots
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Solution Overview
Problem
Existing coherent optical communication systems face challenges in adapting to data rates beyond 400 Gbps due to high hardware complexity and signal distortion issues, including dispersion, polarization-dependent impairment, and noise, which affect long-distance transmission.
Innovation Solution
A data transmission method using a simple target polynomial to generate pilot symbols with good autocorrelation and cross-correlation characteristics, implemented with a direct current balanced structure, facilitating signal restoration at the receiving end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing transmission symbol sequences are used in coherent optical communication systems, then 400 Gbps data rate transmission is achieved, but the system cannot adapt to future scenarios over 400 Gbps (600 Gbps, 800 Gbps, and higher)
Solution Approach 1:
The patent changes the parameter of the polynomial degree from traditional high degrees to a simplified range (1-5), which enables the system to adapt to future data rates beyond 400 Gbps while reducing hardware implementation complexity. This parameter optimization allows the same hardware structure to support multiple future scenarios (600 Gbps, 800 Gbps, and higher) without requiring complex reconfiguration.
2Reliability
If traditional pilot symbol generation methods are used, then signal transmission is maintained, but hardware implementation complexity is high
Solution Approach 1:
The patent optimizes the polynomial degree parameter to a simplified range (1-5), which significantly reduces the hardware structure complexity while maintaining the reliability of signal quality restoration. The simplified polynomial structure requires fewer computational resources and simpler hardware implementation compared to traditional high-degree polynomials.
Solution Approach 2:
The patent employs a simplified polynomial structure that can be easily implemented with low-cost hardware components. The reduced complexity allows for more economical hardware implementation while still achieving the desired signal restoration performance, making the solution more practical for future high-speed optical communication systems.
Data Source
AI summary
A generated data frame includes N symbols in a polarization direction. Every M consecutive symbols in the N symbols include one pilot symbol at a fixed location and M−1 payload symbols, where N=M×Q, Q is an even number, and M is an integer greater than or equal to 1. Q pilot symbols are generated by using the target polynomial and a seed. Each pilot symbol is one of −A−Aj, −A+Aj, A−Aj, and A+Aj, where A is a real number. The Q pilot symbols are direct current balanced. A degree of the target polynomial is less than or equal to 10, and a quantity of terms of the target polynomial is greater than or equal to 2 and less than or equal to 8.