Pluggable PON Video Overlay Device with Triplexer OSA
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Solution Overview
Problem
Conventional radio frequency video overlay optical network units are large in volume, requiring significant installation space and making it difficult to attach, detach, and replace boards, leading to poor compatibility and increased maintenance costs due to soldered or mold-type designs without standardization.
Innovation Solution
A passive optical network-based video overlay pluggable type optical network device with a triplexer optical sub-assembly, detachable boards, and electromagnetic wave shielding, allowing easy connection and disconnection from an indoor optical network terminal, minimizing signal interference and enabling selective combinations of PON and video services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soldered-in or mold-type designs are used for video overlay optical network units, then board separation is easier and signal interference is reduced, but maintenance and replacement become difficult and installation space requirements increase
Solution Approach 1:
The device is divided into separate functional modules: PON board, RF board, and optical sub-assembly (OSA), each connected via standardized pluggable interfaces. This segmentation allows individual boards to be easily removed and replaced without affecting other components, while maintaining proper signal separation to minimize interference.
Solution Approach 2:
Standardized pluggable connectors serve as intermediaries between the PON board, RF board, and OSA. These connectors provide both electrical connection and mechanical retention, enabling easy board replacement while maintaining stable signal transmission and reducing interference through consistent positioning.
2Reliability
If conventional video overlay optical network units are designed with large volume, then board separation distance is increased reducing signal interference, but installation space requirements increase and compatibility decreases
Solution Approach 1:
The device transitions from a large-volume three-dimensional layout to a compact planar configuration. By arranging the PON board, RF board, and OSA in a two-dimensional plane with optimized spacing and using vertical stacking where possible, the design reduces the footprint while maintaining adequate separation distances for signal interference prevention.
Solution Approach 2:
The optical sub-assembly (OSA) is integrated into the housing in a nested configuration, with the PON board and RF board arranged around it. This nested layout maximizes space utilization, allowing adequate separation between signal paths while maintaining a compact overall form factor that reduces installation space requirements.
3Ease of repair
If standardized pluggable interfaces are implemented, then board replacement and maintenance become easier and compatibility improves, but device complexity increases
Solution Approach 1:
The device employs standardized pluggable interfaces that are consistent across different board types and configurations. These universal connectors handle multiple functions: electrical signal transmission, mechanical retention, and alignment positioning. This multi-functionality simplifies the overall design by eliminating the need for separate connection mechanisms for each signal type.
4Area of stationary object
If PON board and RF board are placed close together to reduce device size, then installation space is reduced, but signal interference between PON and RF signals increases
Solution Approach 1:
The optical sub-assembly (OSA) is extracted and positioned as a separate functional unit between the PON board and RF board. This physical separation created by the OSA acts as a spatial barrier that reduces electromagnetic coupling between the PON and RF signals, allowing the boards to be placed closer together without increasing interference.
Solution Approach 2:
The OSA serves as an intermediary structure between the PON board and RF board. Its physical presence and grounding structure act as a shield that blocks electromagnetic interference while allowing the boards to maintain close proximity for space efficiency. The connectors also serve as intermediaries that provide controlled impedance paths for signals.
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 solution reduces the size of the optical network unit, facilitates convenient maintenance and upgrades, minimizes signal interference, and enhances compatibility through standard interfaces, while reducing power loss and costs.
Implementation Method 1
a triplexer optical sub-assembly... which separates a PON optical signal and an RF optical signal from a video overlay optical signal
Implementation Method 2
an electromagnetic wave shielding part provided between the RF board and the PON board... blocking interference between the RF signal and the PON signal
Data Source
AI summary
The present invention relates generally to a passive optical network (PON)-based video overlay pluggable type optical network device that is easily connected and detached from an indoor optical network terminal (ONT) at a subscriber side, which transmits and receives an optical signal in which a video RF optical signal and a PON optical signal are overlaid, wherein a PON board for receiving and processing the PON optical signals and a video RF board for receiving and processing the video RF optical signals are easily removed for replacement from a housing including an optical sub-assembly (OSA), which separates the PON optical signal and the video RF optical signal, and the PON board and the video RF board are individually designed and configured in a removable manner so that interference between the signals is minimized and selective combinations and production are possible according to various types of PONs and video services.