PON Transmission Device Guard Band Compression
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Solution Overview
Problem
In passive optical networks (PON) systems, the guard bands between signals from different optical network units (ONUs) reduce frequency utilization efficiency due to wavelength fluctuations, leading to inefficient use of the available frequency range.
Innovation Solution
A transmission/reception device that includes a photo-electric converter, a guard band remover to narrow the frequency intervals between adjacent signals, an electric signal combiner, and an electric-photo converter to optimize the frequency utilization by compressing guard bands and combining signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard bands are provided between frequency bands of signals from multiple ONUs, then signal interference is prevented, but frequency utilization efficiency is reduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the frequency bands of electric signals based on the detected frequency bands of received optical signals. The frequency band changing unit modifies the frequency parameters of signals from different ONUs to optimize their arrangement, reducing the need for fixed guard bands while preventing interference. This allows the system to adapt to wavelength fluctuations and achieve higher frequency utilization efficiency.
2Productivity
If frequency bands of signals are adjusted to narrow intervals, then frequency utilization efficiency is improved, but signal interference may increase
Solution Approach 1:
The patent implements feedback by detecting the frequency bands of received optical signals from multiple ONUs and using this information to adjust the frequency bands of corresponding electric signals. The frequency band changing unit receives feedback about the actual frequency positions and dynamically modifies the signal arrangement to maintain optimal spacing, preventing interference while maximizing frequency utilization efficiency.
Solution Approach 2:
The system transitions from static frequency allocation to dynamic frequency adjustment. The frequency band changing unit continuously adapts the frequency bands of signals based on real-time detection results, allowing the system to respond to wavelength fluctuations and maintain optimal signal separation without fixed guard bands.
3Productivity
If more intermediate nodes are deployed, then frequency utilization efficiency can be improved, but device complexity and cost increase
Solution Approach 1:
The patent applies universality by enabling a single intermediate node to perform multiple functions: receiving optical signals from multiple ONUs, detecting their frequency bands, changing the frequency bands of corresponding electric signals, and combining them. This multi-functional capability allows one node to handle what would traditionally require multiple nodes, reducing system complexity while maintaining frequency utilization efficiency.
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 improves the frequency utilization efficiency of the PON system by compressing guard bands, allowing for a more efficient use of the available frequency range and reducing the number of required intermediate nodes in high-density network setups.
Implementation Method 1
a photo-electric converter to receive an optical signal based on a plurality of first optical signals having frequency bands different from each other, convert the optical signal into an electric signal
Implementation Method 2
an electric-photo converter to receive the fourth electric signal output from the electric signal combiner, convert the fourth electric signal into an optical signal
Data Source
AI summary
A transmission/reception device is configured to convert an optical signal based on a plurality of first optical signals having frequency bands different from each other into an electric signal and output the electric signal as a plurality of first electric signals; receive the plurality of first electric signals, change frequency bands of some or all of a plurality of second electric signals to narrow an interval between frequency bands of two second electric signals having frequency bands adjacent to each other, and output, as third electric signals, electric signals; to receive a plurality of the third electric signals, combine and output the plurality of third electric signals as a fourth electric signal; and receive the fourth electric signal, convert the fourth electric signal into an optical signal, and output the optical signal as a second optical signal.