Jitter Determination Using Dual Bit Rate Sampling
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Solution Overview
Problem
Optical communication systems face limitations in determining jitter, a timing looseness phenomenon that affects communication quality, particularly in high-speed serial communications, where existing methods are inefficient and costly.
Innovation Solution
A method and apparatus that utilize two different bit rates to sample and compare data patterns, allowing for the determination of jitter in communication systems, enabling efficient and cost-effective jitter detection by generating a second data pattern at a different bit rate than the original and comparing it to the first, thereby identifying jitter characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods are used to determine jitter in high-speed serial communications, then measurement precision can be achieved, but device complexity and cost increase
Solution Approach 1:
The patent creates a copied version of the original data pattern by sampling at a different bit rate. This copied pattern allows comparison with the original to reveal jitter characteristics without requiring complex measurement equipment, thus reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent changes the sampling bit rate parameter from the original bit rate to a different bit rate. This parameter change enables the creation of a comparable data pattern that reveals jitter information through differences between the original and sampled patterns, achieving accurate jitter measurement without complex testing systems.
2Measurement precision
If existing methods are used to determine jitter, then measurement precision can be achieved, but the process becomes costly
Solution Approach 1:
The patent uses a copied data pattern generated by sampling at a different bit rate to determine jitter. This copying approach eliminates the need for expensive specialized testing equipment, making jitter measurement accessible and cost-effective while maintaining accurate measurement results.
Solution Approach 2:
The patent employs a simple, inexpensive sampling mechanism that creates a temporary copied data pattern. This disposable approach replaces expensive, complex testing systems with a low-cost method that achieves the same measurement precision, significantly reducing testing costs.
3Reliability
If sampling is performed at a different bit rate, then jitter can be effectively detected, but data accuracy may be compromised
Solution Approach 1:
The patent creates a copied data pattern through sampling at a different bit rate, which preserves the essential jitter characteristics while allowing for reliable detection. The copied pattern maintains sufficient accuracy for jitter measurement purposes without requiring bit-for-bit fidelity, thus balancing reliability with information preservation.
Data Source
AI summary
In accordance with illustrative embodiments, methods and apparati, which determine jitter are described. In one example embodiment, a method includes receiving a signal, wherein the signal comprises a first data pattern which was generated at a first bit rate. The method also includes sampling the signal at a second bit rate to generate a second data pattern. The period of the second bit rate is different from the period of the first bit rate. The method also includes comparing the first data pattern and the second data pattern to determine differences between the first data pattern and the second data pattern. Furthermore, the method includes determining jitter in the signal according to the differences between the first data pattern and the data second data pattern. In other embodiments, by using two different bit rates to determine jitter, jitter can be determined in communication systems in a convenient and cost effective manner.