Tunable Coherent OTDR System for Multi-Fiber Testing
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Solution Overview
Problem
Conventional Optical Time Domain Reflectometry (OTDR) systems are labor-intensive and prone to errors when manually testing multiple fibers, and embedded OTDR systems increase costs by requiring specialized receivers and complex designs.
Innovation Solution
A tunable OTDR system with a coherent detector and wavelength division demultiplexer that transmits and detects OTDR signals across multiple fibers using a single transmitter, allowing for cost-effective and sensitive fault detection by routing OTDR signals based on wavelength and analyzing reflected spectra for time delay information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single OTDR system is permanently installed at a central office and shared for a plurality of fibers using moving parts and optical switches, then the labor intensity is reduced, but the reliability decreases and costs increase
Solution Approach 1:
The patent segments the fiber testing system by assigning a dedicated OTDR transmitter and receiver pair to each fiber, eliminating the need for shared resources with moving parts. Each fiber has its own dedicated testing equipment that remains stationary, thereby improving reliability while maintaining high productivity through parallel testing of multiple fibers.
Solution Approach 2:
The patent creates separate, dedicated OTDR testing systems for each fiber rather than sharing a single system. This copying approach ensures that each fiber has its own dedicated transmitter and receiver, eliminating the reliability issues associated with shared systems using optical switches and moving parts.
2Ease of manufacture
If embedded OTDR systems are used with the same transmitter, then costs are reduced, but design complexities increase and specialized receivers are required
Solution Approach 1:
The patent segments the testing system into separate, dedicated OTDR units for each fiber, avoiding the need to embed OTDR functionality within communication transmitters. This segmentation simplifies the overall design by eliminating the need for specialized receivers and complex signal isolation mechanisms while maintaining cost-effectiveness through dedicated, purpose-built testing equipment.
3Ease of manufacture
If low cost OTDR receivers are used, then system cost is reduced, but OTDR signal quality and testing capability decrease
Solution Approach 1:
The patent employs dedicated OTDR receivers specifically designed for each fiber, ensuring that high-quality, high-performance receivers are used rather than compromising with low-cost alternatives. This copying approach allows each fiber to have its own optimized receiver that maintains superior signal quality and measurement precision while keeping the overall system cost manageable through parallel dedicated configurations.
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 system reduces testing costs and improves sensitivity by enabling efficient detection of fiber faults across multiple fibers without the need for multiple transmitters or moving parts, maintaining high detection capability at a lower overall system cost.
Implementation Method 1
a wavelength division demultiplexer coupled to the optical transmitter and to a plurality of optical fibers
Implementation Method 2
a detector coupled to the optical transmitter and the wavelength division demultiplexer
Implementation Method 3
detecting a reflected OTDR signal spectrum that has a shifted modulated pattern comprising a frequency shift with respect to the OTDR signal spectrum
Data Source
AI summary
An apparatus comprising an optical transmitter, a coarse tuner coupled to the optical transmitter and having a first tuning range, a fine tuner coupled to the optical transmitter and having a second tuning range smaller than and within the first tuning range, a wavelength division demultiplexer coupled to the optical transmitter and to a plurality of optical fibers, and a detector coupled to the optical transmitter and the wavelength division demultiplexer.