Optical Fiber Signal Quality Measurement Using CRC Error Counting
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Solution Overview
Problem
Existing methods for detecting signal degradation in optical fiber data links are inadequate, leading to unplanned outages and maintenance delays, as they struggle with accurate measurement of signal quality, especially under varying temperature conditions.
Innovation Solution
A system and method for measuring optical fiber signal quality using Cyclic Redundancy Check (CRC) errors to determine bit error rates, sending status messages based on link OK, degraded, or fault thresholds, and employing a firmware solution to analyze video signals in real-time, immune to temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power measurement of the optical signal is used to detect signal degradation, then signal quality monitoring is enabled, but measurement accuracy deteriorates under varying temperature conditions
Solution Approach 1:
The patent changes the measurement parameter from optical power to bit error rate (BER). BER is measured by counting erroneous bits in the data stream, which directly reflects signal quality without being influenced by temperature-induced power variations. This parameter change resolves the contradiction by providing temperature-independent signal quality measurement.
2Reliability
If conventional power measurement schemes are used, then signal monitoring is possible, but reliability deteriorates due to inaccurate measurements under environmental variations
Solution Approach 1:
The patent transitions from measuring optical power to measuring bit error rate, which is inherently immune to temperature effects. BER directly quantifies the number of erroneous bits received, providing a reliable indicator of signal quality that is not affected by environmental temperature variations that cause power fluctuations.
3Loss of time
If early detection of signal degradation is implemented, then maintenance delays are reduced, but system complexity increases due to continuous monitoring requirements
Solution Approach 1:
The patent implements self-service monitoring where the receiving end automatically measures BER by analyzing incoming data frames and generating status messages without requiring external monitoring equipment. The system uses existing data transmission infrastructure to perform monitoring, eliminating the need for additional complex hardware while enabling early detection of signal degradation.
Solution Approach 2:
The patent makes the receiving device perform multiple functions: it both processes the incoming video data for display and simultaneously measures signal quality by detecting BER. This multi-functionality eliminates the need for separate monitoring systems, reducing overall system complexity while enabling continuous early detection of degradation.
Data Source
AI summary
A system and method are disclosed for measurement and reporting of signal quality in an optical data link in terms of Bit Error Rate (BER). The system and method of optical fiber signal quality measurement is highly accurate in early determination of signal degradation, is computationally simple in implementation, and is immune to instability with variable temperature and other environmental factors. Counting a number of error free Cyclic Redundancy Checks (CRC) of a plurality of video signals, the computationally simple method limits the data analysis required to determine a link OK, a link degraded and a link fault status of the optical data link.