Parallel OTDR Front-End Array for Fiber Measurement Speed
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Solution Overview
Problem
High-speed measurement of multiple optical fibers in fiber optic cables is challenging due to increased measurement times, which can negatively impact quality when trying to reduce measurement time without compromising performance or increasing costs.
Innovation Solution
Implementing a multiple front-end device based high-speed optical time domain reflectometer (OTDR) system that allows for synchronous OTDR acquisitions by using an array of independent analog and optic front-end devices to measure optical fibers in parallel, rather than sequentially, thereby reducing overall measurement time while maintaining quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sequential measurement of multiple optical fibers is used, then device complexity is reduced, but measurement time increases significantly
Solution Approach 1:
The system segments the measurement function by deploying multiple independent front-end devices (each with its own OTDR engine, laser, and detector) to measure different optical fibers simultaneously. This parallel architecture eliminates the sequential bottleneck while keeping each front-end device relatively simple in structure.
Solution Approach 2:
The system transitions from a single-dimension sequential measurement approach to a multi-dimensional parallel measurement approach by adding spatial dimensionality through multiple front-end devices operating concurrently, thereby reducing total measurement time without proportionally increasing complexity.
2Loss of time
If measurement time is reduced for each fiber, then overall measurement time decreases, but measurement quality deteriorates
Solution Approach 1:
By segmenting the measurement load across multiple independent front-end devices, each device can maintain its full measurement capability and quality standards while the overall system achieves faster throughput through parallel operation rather than compromising individual measurement quality.
3Loss of time
If multiple independent front-end devices are used for parallel measurement, then measurement time is reduced, but device complexity and cost increase
Solution Approach 1:
The system divides the measurement function into separate, modular front-end devices that can be independently configured and optimized. Each device maintains manageable complexity while the aggregate system achieves high-speed parallel measurement capabilities.
Solution Approach 2:
Multiple front-end devices perform the same universal OTDR measurement function, allowing for standardized designs that reduce per-unit complexity while enabling parallel operation. The redundancy of identical functional units simplifies individual device design compared to a single complex multi-functional system.
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 approach significantly reduces measurement time for multiple optical fibers while maintaining measurement quality, improving dynamic range and reducing the overall cost and performance requirements of the measurement unit.
Implementation Method 1
The optical fibers may transmit light from a source to a destination
Implementation Method 2
The transmitted light may be backscattered and reflected
Implementation Method 3
The transmitted light may be backscattered and reflected
Implementation Method 4
Each of the plurality of analog and optic front-end devices may include an optical receiver to convert a return signal
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
In some examples, multiple front-end device based high speed OTDR acquisition may include measuring, in parallel, light transmission with respect to specified optical fibers of a plurality of optical fibers by utilizing a plurality of analog and optic front-end devices. A front-end interface may be operatively connected to the plurality of analog and optic front-end devices. The front-end interface may convert analog signals received from the specified analog and optic front-end devices to digital signals. A measurement controller may be operatively connected to the front-end interface to control operation of the plurality of analog and optic front-end devices, and analyze, based on the digital signals, a property of the specified optical fibers.