Optical Transmitter Conformance Testing with Equalization Compensation
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Solution Overview
Problem
Existing conformance testing methods for optical transmitters using the NRZ-PAM2 scheme do not adequately determine whether the optical signal can meet the requirements of an optical receiver using equalization receiving technologies, as they do not consider changes in optical signal quality caused by equalization processing.
Innovation Solution
A conformance testing method that involves obtaining a testing symbol pattern, performing equalization compensation, and calculating a parameter based on the resulting eye pattern and noise enhancement coefficient to determine the transmitter's dispersion eye pattern closure degree, ensuring the signal meets the receiver's requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If equalization receiving technologies are introduced to improve signal quality at high transmission rates, then the optical receiver can better handle inter-symbol interference, but the existing conformance testing methods cannot accurately determine whether the optical signal meets the receiver's requirements
Solution Approach 1:
The patent changes the testing parameters by introducing equalization compensation processing and noise enhancement coefficient calculation. Instead of using traditional TDEC parameters alone, the method incorporates equalization-specific parameters (equalization compensation results, noise enhancement coefficients) to accurately assess signal quality under equalization receiving conditions, thereby resolving the mismatch between improved receiver capability and outdated testing methods
Solution Approach 2:
The patent introduces an intermediary testing mechanism that simulates the equalization receiving process. By incorporating an equalization compensation module in the testing apparatus and using it to process test signals, the method creates a virtual equalization environment that bridges the gap between transmitter testing and receiver performance evaluation, enabling accurate conformance determination
2Productivity
If the transmission rate is increased to improve communication efficiency, then more data can be transmitted, but inter-symbol interference increasingly degrades the quality of the transmitted data signal
Solution Approach 1:
The patent applies preliminary anti-action by performing equalization compensation on the test signal before evaluation. The testing method proactively compensates for inter-symbol interference effects in advance during the testing phase, allowing the system to evaluate whether the transmitter signal can withstand expected channel degradation and equalization processing, thus ensuring reliability even at high transmission rates where ISI is severe
Data Source
AI summary
A conformance testing method including: obtaining a testing symbol pattern in an optical signal; performing equalization compensation on the testing symbol pattern; generating a testing eye pattern; calculating a value of a first parameter based on the testing eye pattern and a noise enhancement coefficient, where the first parameter is used to determine a transmitter dispersion eye pattern closure degree of the optical transmitter; and when the value of the first parameter is less than or equal to a preset threshold, determining that conformance testing on the optical signal succeeds.