Optical Access Signal Superimposition Across Separate Control Bands
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Solution Overview
Problem
Interference occurs between management control signals and main signals in passive optical networks due to overlapping frequency bands, leading to ineffective superimposition of additional control signals.
Innovation Solution
An optical access system with a management control unit that generates and superimposes management control signals at different frequency bands, using a control signal superimposing unit to avoid interference by employing distinct superimposition methods for the control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If management control signals are superimposed on main signals using the same frequency band, then signal transmission efficiency is improved, but signal interference occurs leading to transmission reliability degradation
Solution Approach 1:
The patent segments the frequency spectrum into multiple bands and assigns different management control signals to different frequency bands. The management control signal transmission unit divides the spectrum so that first management control signals occupy a first frequency band while second management control signals occupy a second frequency band, preventing frequency overlap and interference while maintaining efficient superimposition transmission.
Solution Approach 2:
The patent applies local quality by assigning different frequency band characteristics to different management control signals. Each management control signal is transmitted with its own designated frequency band properties, allowing simultaneous transmission of multiple control signals without mutual interference, thus improving both transmission efficiency and reliability.
2Adaptability or versatility
If additional management control signals are superimposed on main signals, then system functionality is improved, but signal interference increases leading to transmission quality degradation
Solution Approach 1:
The patent enables the superimposition of multiple management control signals by segmenting the frequency spectrum. First management control signals are transmitted in a first frequency band while second management control signals are transmitted in a second frequency band, allowing enhanced system functionality without the harmful interference that would result from frequency overlap.
Solution Approach 2:
The patent resolves interference by transitioning from a single-frequency-dimension approach to a multi-frequency-band dimension. By distributing management control signals across different frequency dimensions (first frequency band and second frequency band), the system achieves improved adaptability and versatility while eliminating the harmful interference that would occur in a single-frequency environment.
Data Source
AI summary
Provided is an optical access system that performs communication using an optical signal on which a management control signal used for management and control is superimposed, the optical access system including: a subscriber device on a transmitting side that generates an optical signal by superimposing the management control signal on a main signal and transmits the generated optical signal; a management control unit that outputs a management control signal which is superimposed on the optical signal transmitted by the subscriber device on the transmitting side and which has a frequency band different from a frequency of the management control signal superimposed on the optical signal; and a control signal superimposing unit that superimposes the management control signal output from the management control unit on the optical signal.