Reconfigurable Fiber Dispersion Reference Module
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Solution Overview
Problem
Current link models in industry standards for optical channels, particularly multimode fibers, inadequately describe fiber dispersion phenomena, leading to inconsistent performance evaluation of transceivers due to unaccounted modal and chromatic dispersion interactions, and fail to effectively test worst-case conditions, especially at higher baud rates and in single mode fiber channels.
Innovation Solution
A Multi-Port/Multi-Channel Reconfigurable Fiber Dispersion Reference Module (MM-FDRM) is designed to provide a controlled environment for testing VCSEL-based transceivers by incorporating fibers of varying characteristics and lengths, with a refractive index profile optimized for worst-case modal bandwidth and chromatic dispersion, allowing for efficient and repeatable multichannel testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If link models assume modal and chromatic dispersions do not interact, then estimation of worst-case channels is simplified, but performance evaluation of transceivers becomes inconsistent with experimental results
Solution Approach 1:
The patent introduces a new parameter α (alpha) that defines the refractive index profile shape to control the interaction between modal and chromatic dispersions. By adjusting this parameter, the system can create fiber channels with different dispersion characteristics, enabling accurate worst-case scenario testing while maintaining manageable model complexity through a single controlling parameter.
Solution Approach 2:
The patent creates dynamically configurable fiber channels that can switch between different dispersion interaction scenarios. The reconfigurable module allows testing under varying modal bandwidth and chromatic dispersion conditions, enabling the system to adapt to different worst-case scenarios rather than relying on static assumptions.
2Adaptability or versatility
If fibers with bandwidth within the critical region are manufactured, then worst-case channel testing is enabled, but manufacturing yield decreases due to variability
Solution Approach 1:
Instead of manufacturing multiple fiber types with different characteristics, the patent creates a reference module that copies or simulates various fiber channel conditions using a single standardized fiber. The reconfigurable module replicates different modal bandwidth and chromatic dispersion scenarios, eliminating the need to manufacture low-yield critical-region fibers while maintaining testing capability.
Solution Approach 2:
The patent introduces a reconfigurable reference module as an intermediary between the transceiver under test and the actual fiber channel. This intermediary can simulate different fiber characteristics (OM3, OM4, etc.) and dispersion conditions, allowing worst-case testing without requiring physical fibers manufactured to precise critical specifications.
3Length of stationary object
If single mode fiber is used for longer reaches, then transmission distance is improved, but performance degrades at higher baud rates due to multipath interference and chromatic dispersion
Solution Approach 1:
The patent applies different quality characteristics to different segments or configurations of the transmission channel. The reconfigurable module can locally adjust chromatic dispersion and modal bandwidth parameters to create optimal channel conditions for specific baud rates and reach requirements, rather than using a uniform fiber type throughout.
4Adaptability or versatility
If multiple fiber organizers with different characteristics are integrated into a single module, then multichannel testing capability is improved, but device complexity increases
Solution Approach 1:
The patent designs a universal reconfigurable reference module that can perform multiple testing functions through a single standardized interface. The fiber drum structure with rotatable organizers allows one module to test multiple transceiver types and multiple channel conditions, achieving multi-functionality without proportionally increasing operational complexity.
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 MM-FDRM enables precise evaluation and selection of transceivers across different design and production stages, effectively simulating worst-case conditions to ensure reliable high-speed data transmission by accounting for modal and chromatic dispersions, thereby improving the accuracy of performance testing.
Implementation Method 1
The new shape of the refractive index profile is designed to provide worst-case EMB, while consistently exacerbating chromatic dispersion and mode partition noise
Implementation Method 2
The new shape of the refractive index profile is designed to provide worst-case EMB, while consistently exacerbating chromatic dispersion and mode partition noise
Implementation Method 3
A fiber organizer containing fibers of different characteristics or different lengths. Multiple organizers can be placed on a single rotational axis to form what is referred to herein as a fiber drum
Data Source
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AI summary
A fiber dispersion reference module has an enclosure with at least one fiber optic port and at least one inner rotating element. Each element having a plurality of optical channels, the enclosure and inner rotating element configured such that the rotation of the inner rotating element relative to the enclosure allows the fiber optic port of the enclosure to change its coupling between the plurality of optical channels in the inner rotating element.