Optical Transmission System Coefficient Estimation
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Solution Overview
Problem
Estimating the response characteristics of individual devices in an optical transmission system is challenging due to device-specific linear and nonlinear characteristics, which vary greatly depending on the device, environment, and parameters, making it difficult to compensate for signal deterioration effectively.
Innovation Solution
An optical transmission system with a coefficient determination unit that optimizes coefficients based on reception signals to compensate for device characteristics, and a device characteristic estimation unit that estimates the characteristics of each device using these optimized coefficients, allowing for easy estimation of response characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device-specific characteristics are compensated for using individual estimation, then signal quality is improved, but the complexity of the system increases due to the need to estimate characteristics for each device
Solution Approach 1:
The patent applies universality by using a single coefficient determination unit that can estimate characteristics for multiple different devices (DACs, driver amplifiers, modulators, lasers, photodiodes, TIAs, ADCs) through a unified estimation process, rather than requiring separate estimation mechanisms for each device type
Solution Approach 2:
The patent uses parameter changes by optimizing coefficients that represent device characteristics through mathematical modeling, transforming the physical device characteristics into adjustable parameters that can be compensated for through coefficient optimization in the digital signal processing domain
2Measurement precision
If coefficients are optimized for each individual device, then measurement precision of device characteristics is improved, but the time required for estimation increases
Solution Approach 1:
The patent applies preliminary action by using a coefficient determination unit that pre-optimizes coefficients based on received signals before actual transmission, storing these optimized coefficients for use in compensating device characteristics during normal operation, thus avoiding time-consuming estimation during live transmission
Solution Approach 2:
The patent uses feedback by determining coefficients based on received signals and using these optimized coefficients to compensate for device characteristics, creating a closed-loop system where the estimation results are continuously refined and applied to improve signal quality
Data Source
AI summary
An optical transmission system, in which an optical transmission apparatus and an optical reception apparatus are provided, includes a coefficient determination unit configured to optimize, based on a reception signal received by the optical reception apparatus, a coefficient to be used to compensate for deterioration according to characteristics of each device configuring a transmission path between the optical transmission apparatus and the optical reception apparatus, and a device characteristic estimation unit configured to estimate the characteristics of each device by using the optimized coefficient.