Fiber Optic Reflectance Standard for Traceable ORL Calibration
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Solution Overview
Problem
Current optical return loss measurement methods lack a traceable national standard, leading to significant discrepancies and uncertainties in calibration, making it difficult to ensure accurate and consistent measurements in fiber optic communication systems.
Innovation Solution
A fiber optic reflectance standard (FORS) is implemented, comprising a 1×2 fiber optic splitter with a reflector and an attenuator, providing a known and adjustable reflectance for calibrating optical return loss meters (ORLMs) with an uncertainty of 0.12 dB or less, ensuring accurate calibration across different instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical return loss measurement methods are used, then measurement capability is provided, but measurement precision and calibration accuracy deteriorate due to lack of traceable national standard
Solution Approach 1:
The patent introduces a fiber optic reflectance standard (FORS) as an intermediary device between the optical return loss meter and the ultimate reference standard. The FORS comprises a 1x2 fiber optic splitter with a reflector and attenuator, creating a known reflectance that serves as a traceable reference. This intermediary provides a stable, known reflectance value that can be used to calibrate the measurement instrument, thereby improving measurement precision while establishing reliability through traceability to national standards.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the attenuator within the FORS to provide different known reflectance values. By changing the attenuation parameter, the system can calibrate at multiple reflectance levels, improving measurement accuracy across different operating conditions while maintaining traceability to national standards through the standardized attenuator components.
2Measurement precision
If no fiber optic reflectance standard is implemented, then device complexity is reduced, but measurement precision and calibration accuracy worsen
Solution Approach 1:
The FORS is segmented into distinct functional components: a 1x2 fiber optic splitter, a reflector, and an attenuator. This segmentation allows each component to be optimized and characterized independently, with the splitter providing signal division, the reflector providing known reflectance, and the attenuator providing adjustable loss. The segmented design improves measurement precision through better component control while managing complexity through modular assembly and standardized interfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The FORS system achieves calibration uncertainty four times better than typical methods, allowing ORLMs to meet the required accuracy of ±0.50 dB, ensuring reliable and consistent optical return loss measurements.
Implementation Method 1
an optical reflector coupled to the second end of the optical fiber to reflect back all optical signals through the optical fiber and attenuator back to the splitter
Implementation Method 2
an attenuator configured to contain a portion of the optical fiber between the first and second ends and selectively attenuate optical signal gain of the optical fiber
Data Source
AI summary
Methods, apparatus, and systems are disclosed for implementing a fiber optic reflectance standard (FORS) for testing and/or calibration of a test instrument (TI), which provides a traceable means to calibrate the making optical return loss measurements (ORLM). The apparatus for implementing the FORS may include an optical splitter, first and second optical inputs coupled to the optical splitter, and an optical fiber having first and second ends, and coupled to the optical splitter at the first end of the optical fiber. Furthermore, the apparatus includes an attenuator (e.g., a mechanical attenuator) configured to contain a portion of the optical fiber between the first and second ends and selectively attenuate optical signal gain of the optical fiber. The testing and/or calibration results in an uncertainty that is at least four times better than a typical test instrument.