Reflectometric One-Cord Referencing for Optical Power Loss
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Solution Overview
Problem
Existing optical power loss measurement (OPLM) methods, such as those used in OLTSs, face challenges in high fiber count testing environments like large datacenters and supercomputers, requiring simplified and precise referencing methods that minimize measurement biases and connector compatibility issues.
Innovation Solution
A reflectometric one-cord method combining OPLM and OTDR capabilities, allowing for a single-step connection that measures connector loss using OTDR, eliminating biases and connector incompatibilities by integrating OTDR and OPLM functions in test units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional one-cord reference procedure is used, then measurement precision is improved, but device complexity increases due to requiring large-area detectors and multiple reference steps
Solution Approach 1:
The patent combines OTDR and OPLM measurement capabilities into a single integrated test unit, allowing both reflectometric and power loss measurements to be performed through one device without requiring separate instruments or complex switching arrangements. This integration maintains measurement precision while simplifying the overall device configuration and操作流程.
Solution Approach 2:
The patent segments the measurement process into distinct functional modules within the test unit: an OTDR module for measuring connector loss through reflectometric methods, and an OPLM module for measuring insertion loss through power measurement. This segmentation allows each module to be optimized independently while working together in a coordinated fashion, reducing overall system complexity.
2Device complexity
If two-cord or three-cord reference procedures are used with fiber coupled detectors, then device complexity is reduced, but measurement precision deteriorates due to introducing small biases
Solution Approach 1:
The patent introduces an OTDR measurement as an intermediary step that characterizes the reference link including connector losses. By using the OTDR to measure and quantify connector loss separately, the system can then compensate for these losses in the final insertion loss calculation, thereby eliminating the measurement biases introduced by traditional multi-cord methods while keeping the procedure simple.
Solution Approach 2:
The patent implements a feedback mechanism where the OTDR measurement results are used to correct and refine the OPLM measurements. The connector loss values obtained from OTDR are fed back into the insertion loss calculation process, allowing the system to automatically compensate for reference link variations and achieve higher precision without increasing procedural complexity.
3Adaptability or versatility
If multiple reference procedures are implemented to handle different connector scenarios, then adaptability is improved, but ease of operation deteriorates due to requiring multiple connection steps
Solution Approach 1:
The patent creates a universal test unit that can handle all connector scenarios (different connector types, mismatched connectors, various reference link configurations) through a single standardized procedure. The integrated OTDR-OPLM capability allows the same basic measurement sequence to adapt automatically to different physical configurations, eliminating the need for operators to learn multiple specialized procedures.
Solution Approach 2:
The patent enables the measurement system to automatically characterize and compensate for its own reference link conditions without requiring external calibration or manual adjustment. The OTDR automatically measures the connector loss in the reference link, and the system automatically uses this information to correct subsequent OPLM measurements, making the entire process self-calibrating and extremely easy to operate.
4Productivity
If traditional OPLM methods are used in high fiber count testing, then productivity is maintained, but measurement precision deteriorates due to accumulated connector losses and biases
Solution Approach 1:
The patent replaces the traditional mechanical/power-based reference method with an optical reflectometric method for characterizing connector loss. Instead of using power measurements alone, the OTDR uses light reflectometry to directly measure connector loss, providing more accurate and consistent results that accumulate less error in high fiber count environments, while maintaining high productivity through automated measurement sequences.
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 method provides accurate optical insertion loss measurements with reduced uncertainty, similar to traditional one-cord methods, enabling efficient and precise measurements in various connector scenarios without complex multi-step procedures.
Implementation Method 1
performing an OTDR acquisition toward the reference optical waveguide link using the first OTDR acquisition device to obtain a first OTDR trace
Implementation Method 2
performing an OTDR acquisition toward the reference optical waveguide link using the first OTDR acquisition device to obtain a first OTDR trace
Implementation Method 3
measuring a reference power value P1 of the OPLM system, the reference power value P1 resulting from the propagation of light from the first optical source to the first power meter via a reference optical waveguide link
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Methods and systems for referencing an optical power loss measurement (OPLM) system, and methods and systems for measuring an optical insertion loss of an optical device under test (DUT) using an OPLM system referenced as such. The herein-provided reflectometric one-cord referencing method combines the capabilities of an OPLM system with that of an Optical Time Domain Reflectometer (OTDR). A first test unit comprises an optical source that is used as the light source in the OPLM. A second test unit comprises a power meter which is used as the power meter in the OPLM measurement. Either the first or the second test unit comprises an OTDR acquisition device. The reflectometric one-cord reference measures the connector loss along the reference link using OTDR capabilities of the test unit(s). Once the power reference of the OPLM devices is obtained, the reflectometric one-cord reference method may determine the optical insertion loss of the DUT while eliminating the measured connector loss.