Uneven Branch Optical Splitter for Biased PON User Distribution
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Solution Overview
Problem
Conventional PON systems face challenges in achieving long haul distance transmission due to attenuation of optical intensity and waveform distortion, especially with biased user distribution, leading to inefficient optical energy exchange and reduced network reliability.
Innovation Solution
The implementation of an uneven branch type optical splitter, which adjusts branching ratios to optimize optical energy efficiency by varying the output intensity at each port based on user distribution, allowing for longer haul distances without the need for optical amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an even branch type optical splitter is used to connect multiple ONUs, then the optical intensity is evenly divided to all branches, but the optical energy efficiency is low when user distribution is biased and transmission distance is limited
Solution Approach 1:
The patent applies asymmetry by transitioning from an even branch optical splitter to an uneven branch optical splitter. The uneven branch splitter distributes optical intensity asymmetrically according to the number of ONUs in each branch, with branches having fewer ONUs receiving higher optical intensity and branches with more ONUs receiving lower optical intensity. This asymmetric distribution optimizes optical energy efficiency for biased user distributions while maintaining network reliability.
Solution Approach 2:
The patent implements local quality by assigning different optical intensity levels to different branches based on their specific characteristics (number of ONUs). Each branch receives optical intensity tailored to its local requirements, with the branching ratio adjusted per branch to ensure optimal signal strength at each ONU location, thereby improving overall system efficiency.
2Quantity of substance
If the number of branch points is increased to accommodate more ONUs, then more users can be served, but the transmission distance becomes shorter due to cumulative branching loss
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the branching ratio parameters of the uneven branch optical splitter based on the number of ONUs in each branch. By changing the branching ratio parameters according to user distribution, the system can accommodate more ONUs while compensating for cumulative branching loss, thereby extending the feasible transmission distance.
3Length of moving object
If optical amplifiers are added to extend transmission distance, then longer haul distance is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for optical amplifiers by implementing an uneven branch optical splitter that optimizes optical intensity distribution at the source. By taking out the amplification function and replacing it with intelligent splitting at the OLT side, the system achieves extended transmission distance without adding complex active devices, thereby reducing device complexity and cost.
Solution Approach 2:
The uneven branch optical splitter acts as an intermediary that mediates between the OLT and multiple ONUs by optimizing optical intensity distribution before transmission. This intermediary device prevents signal degradation at the source rather than requiring amplification during transmission, achieving longer haul distance without additional complexity.
Data Source
AI summary
To provide an optical communication system and an optical communication method able to achieve a high reliable access network capable of long haul distance transmission considering the optical energy efficiency even if the user distribution is biased. An uneven branch optical splitter included in an optical communication system according to the present invention can output the optical intensities different for each output port by adjusting the branching configuration and the branching ratio. For example, a reach transmission distance of the farmost user can be extended or the number of connectible users can be increased by adjusting the branching configuration of the uneven branch optical splitter or the branching ratios such that the near minimum reception sensitivity is given for the ONU installed near the telecommunications carrier.