Multi-band Signal Processing System Joint Box Arrangement
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Solution Overview
Problem
The C+L band EQL system can only accommodate a quarter of the number of optical fibers that a single-band C band system can, requiring four joint boxes in parallel, which increases the cross-sectional area needed for optical cables.
Innovation Solution
The multi-band signal processing system includes two joint boxes, each accommodating a multi-band signal processing device and signal cables, allowing for the dense placement of single-band signal processing devices by using a pass-through configuration that enables tandem coupling of joint boxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a C+L band EQL system uses four single-band signal processing devices per optical fiber, then gain equalization for multi-band signals is achieved, but the number of optical fibers that can be accommodated in one joint box is reduced to at most 4
Solution Approach 1:
The system divides the multi-band signal processing into separate single-band signal processing devices for C band and L band, with each device handling one band independently. This segmentation allows each device to be optimized for its specific band while maintaining overall system functionality.
Solution Approach 2:
The patent implements a nested configuration where joint boxes are arranged in series, with pass-through optical fibers connecting multiple joint boxes. This nesting allows optical fibers to traverse through multiple joint boxes, effectively increasing the total accommodation capacity beyond what a single joint box could provide.
2Quantity of substance
If four joint boxes are arranged in parallel to accommodate 16 optical fibers in a C+L band system, then the number of optical fibers is increased, but the cross-sectional area perpendicular to the optical cable becomes four times as large
Solution Approach 1:
Instead of arranging joint boxes in parallel (increasing cross-sectional area), the patent transitions to a series arrangement along the optical cable length. This dimensional change from parallel to serial configuration maintains fiber accommodation capacity while minimizing the cross-sectional footprint.
Solution Approach 2:
Multiple joint boxes are merged into a compact series configuration where pass-through fibers connect them sequentially. This combining approach allows the system to accommodate multiple optical fibers through coordinated use of multiple joint boxes rather than requiring each box to independently handle all fibers.
3Reliability
If optical fiber amplifiers with monotonic amplification characteristics are used, then optical repeater transmission can be performed, but the implementation cost increases due to the requirement of spectrum inverters
Solution Approach 1:
The patent extracts and removes the spectrum inverter component from the optical repeater transmission system. By eliminating this complex and costly component, the system achieves the same transmission functionality through a simplified configuration using only standard optical fiber amplifiers with monotonic characteristics.
Solution Approach 2:
The system uses universal optical fiber amplifiers that can handle multiple bands (C band and L band) without requiring band-specific customization or additional components like spectrum inverters. This multi-functional approach reduces overall system complexity and implementation cost.
Data Source
AI summary
[Problem] To accommodate single-band signal processing devices in a high-density manner.[Solution] Provided is a system including: a first signal cable; a second signal cable; a third signal cable; a fourth signal cable; a first multi-band signal processing device that processes a first signal input from the first signal cable and outputs a resultant second signal to the second signal cable; a second multi-band signal processing device that processes a third signal input from the third signal cable and outputs a resultant fourth signal to the fourth signal cable; a first joint box that accommodates the first signal cable, the first multi-band signal processing device, the second signal cable, and the fourth signal cable; and a second joint box that accommodates the second signal cable, the third signal cable, the second multi-band signal processing device, and the fourth signal cable.