Burst Signal Conditioning in Optical Line Terminals
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Solution Overview
Problem
In 50G NRZ communication systems, the existing burst-mode PON systems face challenges in minimizing preamble time and maintaining signal quality due to the need for extensive signal equalization, which requires new receiver architectures to keep the burst mode settling time within reasonable limits and prevent power penalties.
Innovation Solution
An apparatus and method for signal conditioning in an Optical Line Terminal (OLT) that adjusts settings for analog signal conditioning of upstream signals, obtaining coefficients for digital signal conditioning to provide a second compensated signal, ensuring accurate linear reception without adversely affecting throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extensive equalization is implemented for 50G NRZ communication, then signal quality is improved, but preamble time increases and throughput decreases
Solution Approach 1:
The equalization process is divided into two distinct stages: analog signal conditioning performed during the preamble phase, and digital signal conditioning performed after the burst is received. This segmentation allows the system to perform extensive equalization without increasing preamble time, as the heavy lifting is done in the digital domain after the burst arrives.
Solution Approach 2:
The analog front-end performs preliminary signal conditioning during the preamble phase to prepare the signal for subsequent digital processing. This preliminary action reduces the burden on the digital equalizer and allows for more aggressive digital equalization without extending the overall settling time.
2Measurement precision
If analog signal conditioning settings are adjusted, then signal compensation is improved, but settling time increases
Solution Approach 1:
The signal conditioning process is segmented between analog and digital domains. The analog domain handles initial compensation with faster response, while the digital domain provides precise compensation with lower latency requirements. This division allows high accuracy without excessive settling time.
Solution Approach 2:
The system changes the parameters of signal conditioning by implementing both analog and digital conditioning stages with different characteristic parameters. The analog stage uses continuous-time parameters for initial compensation, while the digital stage uses discrete-time coefficients for precise correction, allowing optimization of both accuracy and speed.
3Measurement precision
If digital signal conditioning coefficients are obtained, then signal accuracy is improved, but processing complexity increases
Solution Approach 1:
The receiver architecture is segmented into distinct analog and digital processing blocks. The analog front-end handles initial signal conditioning with simpler circuitry, while the digital domain performs precise equalization with algorithmic complexity. This segmentation allows the system to manage complexity by distributing it across different domains with different computational characteristics.
Data Source
AI summary
In one embodiment, the apparatus includes at least one memory configured to store instructions; and at least one processor configured to execute the instructions and cause the apparatus to perform, receiving, by a receiver in an Optical Line Terminal, OLT, a burst of an upstream signal transmitted in burst mode, adjusting settings for an analog signal conditioning of the received upstream signal; performing the analog signal conditioning of the received upstream signal based on the adjusted settings such that a first compensated signal is provided, obtaining coefficient(s) for a digital signal conditioning of the first compensated signal; performing the digital signal conditioning of the first compensated signal based on the obtained coefficient(s) such that a second compensated signal is provided.