Redundant Transponder Array for RoF Picocell Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In radio-over-fiber (RoF) systems, transponder failures in optical fiber cables lead to service disruptions and are difficult to repair due to limited access, resulting in inconvenience and high costs, especially in picocellular wireless systems that require continuous operation.
Innovation Solution
Implementing a redundant transponder array with first and second antennas operating at respective frequencies to form co-located picocells, where a backup picocell can be formed by an adjacent transponder if the primary transponder fails, ensuring continuous coverage by switching the electrical signal to the backup antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transponders are sealed within optical fiber cables, then system reliability is improved, but ease of repair deteriorates
Solution Approach 1:
The patent implements preliminary action by pre-configuring backup transponders within the optical fiber cable that can automatically activate when a primary transponder fails. The backup transponders are positioned and configured in advance, so that when failure occurs, the system can immediately switch to backup without requiring physical access or manual intervention for repair.
Solution Approach 2:
The patent applies beforehand cushioning by incorporating redundant backup transponders that serve as a protective measure against primary transponder failures. These backup units are prepared in advance and can compensate for failures, cushioning the impact of transponder malfunctions on system operation.
2Area of stationary object
If transponders are distributed throughout optical fiber cable, then coverage area is improved, but difficulty of accessing for repair increases
Solution Approach 1:
The patent merges primary and backup transponders into a single distributed array within the optical fiber cable. By combining multiple transponder functions (primary and backup) into the same physical infrastructure, the system achieves wide coverage while eliminating the need for separate access paths to backup units.
Solution Approach 2:
The patent implements self-service by enabling the backup transponders to automatically activate and take over when primary transponders fail. The system performs its own repair function through automatic failover, eliminating the need for external intervention or physical access to repair locations.
3Reliability
If backup transponder is provided, then service continuity is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing backup transponders that can serve multiple purposes: they remain dormant during normal operation (minimal function) and automatically activate to provide full transponder functionality when needed. This multi-functionality approach maintains service continuity while minimizing the impact of backup units on system complexity during normal operation.
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 provides seamless coverage and minimizes service disruptions by enabling automatic switching to a backup picocell when a transponder fails, reducing maintenance costs and ensuring continuous operation of the RoF system.
Implementation Method 1
The transponder has no digital information processing capability. Rather, the digital processing capability resides in the head-end station. The transponder is transparent to the RF signals and simply converts incoming optical signals from the optical fiber link to electrical signals
Implementation Method 2
The antenna also receives electromagnetic signals (i.e., electromagnetic radiation) and converts them to electrical signals (i.e., electrical signals in wire)
Implementation Method 3
The transponder then converts the electrical signals to optical signals, which are then sent to the head-end station via the optical fiber link
Data Source
AI summary
A redundant transponder array for a radio-over-fiber (RoF) optical fiber cable is disclosed. The redundant transponder array includes two or more transponders having an antenna system. The antenna system has first and second antennas adapted to form first and second substantially co-located picocells when operated at respective first and second frequencies. The second antenna is adapted to form a picocell that extends into the adjacent picocell when operated at the first frequency. A transponder thus can serve as a backup transponder to a failed adjacent transponder by redirecting the first-frequency signal sent to the failed transponder to the second antenna of the adjacent transponder.