OTDR Single-End Optical Connector Loss Testing
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Solution Overview
Problem
Existing optical testing methods are inefficient for devices without preconnectorized ends, as they require temporary connectors and bidirectional testing, making it difficult to detect errors and requiring extensive trial and error, and cannot accurately locate faults within optical devices.
Innovation Solution
The use of an optical time domain reflectometer (OTDR) to inject a signal onto optical equipment and observe reflected light, allowing for the determination of loss at optical connectors without requiring both ends to be connectorized, and adjusting for mode field diameter differences to identify faulty connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional bidirectional testing with temporary connectors is used, then both insertion loss and return loss can be measured, but testing time increases and error detection capability decreases
Solution Approach 1:
The patent extracts the testing function to a single end of the optical device using an OTDR, eliminating the need for bidirectional testing with temporary connectors. The OTDR independently measures both insertion loss and return loss from one end, removing the complex setup requiring connectors at both ends and significantly reducing testing time while maintaining measurement precision.
Solution Approach 2:
The OTDR serves as an intermediary device that enables single-end testing by injecting test signals and analyzing reflected light. This intermediary instrument provides the capability to measure optical parameters without requiring physical access to both ends of the optical device, thus eliminating the need for temporary connectors and bidirectional testing procedures.
2Ease of operation
If temporary connectors are installed for testing non-connectorized devices, then testing can be performed, but error rates increase due to trial and error connections
Solution Approach 1:
The patent removes the requirement for temporary connectors entirely by using an OTDR that can perform complete optical testing from a single connectorized end. This extraction of the testing function to one end eliminates the trial-and-error connection process and associated reliability issues with temporary connectors.
Solution Approach 2:
The OTDR performs self-service testing by injecting test signals and analyzing the reflected light to automatically determine insertion loss and return loss. This self-service capability eliminates the need for manual connector installation and adjustment, providing both ease of operation and high reliability without trial and error.
3Measurement precision
If bidirectional testing is performed to measure insertion loss and return loss, then comprehensive optical parameters are obtained, but device complexity increases
Solution Approach 1:
The OTDR is a universal testing instrument that performs multiple functions including insertion loss measurement, return loss measurement, and fault location from a single end. This multi-functionality replaces the need for separate bidirectional testing setups, maintaining comprehensive optical parameter measurement while significantly simplifying the test setup complexity.
Solution Approach 2:
The OTDR acts as an intermediary that consolidates multiple measurement functions into a single device operated from one end. This intermediary instrument provides comprehensive optical parameter measurement capability without requiring the complex bidirectional setup with multiple instruments and temporary connectors.
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
This method significantly reduces testing time and error by allowing single-direction testing of optical connectors, achieving high accuracy in identifying faulty connections and reducing the need for extensive bidirectional testing, with over 95% of connectors being successfully screened using OTDR-based analysis.
Implementation Method 1
injecting an optical signal onto the optical equipment from the optical time domain reflectometer, and observing an amount of reflected light at the connector
Data Source
AI summary
Methods for testing optical equipment are disclosed. One method includes connecting an optical time domain reflectometer to optical equipment to be tested, the optical equipment including at least one optical connector. The method includes injecting an optical signal onto the optical equipment from the optical time domain reflectometer, and observing an amount of reflected light at the connector. Based on the observed reflected light, an amount of loss attributable to the optical equipment is determined.