Band-Pass Filters in Optical Repeater Supervisory Paths
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Solution Overview
Problem
Subsea network operators face challenges in optimizing the capacity and performance of fiber-optic cable plants to handle increasing bandwidth demands, requiring a supervisory system for fault detection and diagnostics that is also cost-effective and adaptable throughout the plant's lifespan.
Innovation Solution
A bidirectional optical repeater with two unidirectional optical amplifiers and a supervisory optical circuit that includes narrow band-pass optical filters, allowing independent control of supervisory optical signals and backscattered light attenuation, enabling efficient monitoring and diagnostics in optical transport systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If narrow band-pass optical filters are placed in supervisory signal paths, then supervisory signal monitoring capability is improved, but device complexity increases
Solution Approach 1:
The optical path is segmented into separate pathways: one for supervisory signals containing narrow band-pass filters and another for backscattered light that bypasses the filters. This segmentation allows each pathway to be optimized independently, improving monitoring capability without proportionally increasing overall device complexity.
Solution Approach 2:
The patent introduces an intermediary optical circuit that directs different types of light (supervisory signals vs. backscattered light) through different paths. This intermediary structure enables selective filtering without requiring all components to handle both signal types, reducing the complexity burden.
2Measurement precision
If separate control of supervisory signals and backscattered light is implemented, then monitoring precision is improved, but device complexity increases
Solution Approach 1:
The system is divided into independent control pathways: supervisory signal paths with band-pass filters and backscattered light paths that bypass them. This segmentation enables separate attenuation control for each signal type, improving monitoring precision while distributing complexity across modular components.
Solution Approach 2:
The optical circuit provides dynamic routing capabilities, allowing selective direction of supervisory signals versus backscattered light through different pathways based on wavelength and signal type. This dynamic control enables precise monitoring without requiring static complex filtering for all signals.
3Adaptability or versatility
If independent attenuation control is provided for supervisory signals and backscattered light, then adaptability is improved, but ease of operation decreases
Solution Approach 1:
Attenuation control is segmented into independent mechanisms for supervisory signals and backscattered light. The supervisory path includes band-pass filters with controlled attenuation, while the backscattered light path has separate attenuation control. This segmentation provides adaptability for different monitoring scenarios while keeping each control mechanism relatively simple.
Solution Approach 2:
The system enables independent adjustment of attenuation parameters for different signal types. By changing attenuation parameters selectively for supervisory signals versus backscattered light, the system adapts to various monitoring requirements without requiring complex coordinated control of all parameters simultaneously.
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 solution enhances the monitoring capabilities of subsea networks by allowing separate control of supervisory signals and backscattered light, improving fault detection and diagnostics while maintaining a low-cost implementation, thus addressing the growing bandwidth demands effectively.
Implementation Method 1
each of these pathways having located therein a respective narrow band-pass optical filter
Implementation Method 2
two unidirectional optical amplifiers... a first optical amplifier located in a first optical path and configured to amplify optical signals transmitted in a first direction
Implementation Method 3
an optical circuit connected to optically couple an optical output port of the first optical amplifier and a first optical port of the second optical amplifier
Data Source
AI summary
A bidirectional optical repeater having two unidirectional optical amplifiers and a supervisory optical circuit connected to optically couple the optical ports thereof. In an example embodiment, the supervisory optical circuit provides one or more pathways therethrough for supervisory optical signals, each of these pathways having located therein a respective narrow band-pass optical filter. The supervisory optical circuit further provides one or more pathways therethrough configured to bypass the corresponding narrow band-pass optical filters in a manner that enables backscattered light of any wavelength to cross into the optical path that has therein the unidirectional optical amplifier directionally aligned with the propagation direction of the backscattered light.