Optical Access Monitoring Signal Averaging for Main-Signal Reception
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Solution Overview
Problem
Conventional optical access systems face challenges in enhancing reception sensitivity to monitoring control signals while minimizing the impact on main signals, as increasing the superimposition ratio of monitoring control signals degrades the reception sensitivity to the main signal.
Innovation Solution
An optical access system with an optical transmission device that generates and superimposes monitoring control signals on a main signal, using a photoelectric conversion unit, analog-to-digital converter, averaging processing unit, and demodulation unit to enhance reception sensitivity by averaging quantized data of monitoring control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the superimposition ratio of monitoring control signals is increased to enhance reception sensitivity, then the reception sensitivity to monitoring control signals is improved, but the reception sensitivity to the main signal is degraded
Solution Approach 1:
The patent segments the received optical signal into multiple copies through coherent detection and digital signal processing. By dividing the signal processing into separate paths (one for main signal and one for monitoring control signal), the system can enhance the monitoring control signal without degrading the main signal reception sensitivity. The segmented signal copies are then combined through averaging to improve the signal-to-noise ratio for monitoring control signals.
Solution Approach 2:
The patent employs periodic transmission of monitoring control signals superimposed on the main signal. By transmitting monitoring control signals at regular intervals and accumulating multiple copies over time, the system enhances reception sensitivity through temporal averaging. This periodic action allows the monitoring control signals to be reinforced while maintaining the integrity of the main signal transmission.
2Loss of information
If monitoring control signals are superimposed on the main signal, then the monitoring control signals can be transmitted, but the signal-to-noise ratio of the monitoring control signals is insufficient
Solution Approach 1:
The patent applies preliminary coherent detection to the received optical signal before extracting the monitoring control signals. By performing coherent detection first, the system creates multiple signal copies that can be processed separately. This preliminary action enables subsequent averaging operations that enhance the signal-to-noise ratio of the monitoring control signals without requiring increased superimposition ratios.
Solution Approach 2:
The patent creates multiple copies of the monitoring control signals through coherent detection and digital signal processing. By generating multiple identical copies of the monitoring control signal from a single superimposed signal, the system can accumulate these copies through averaging to improve the signal-to-noise ratio. This copying mechanism allows the monitoring control signals to be transmitted at low power levels while still achieving sufficient reception sensitivity.
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 system improves reception sensitivity to monitoring control signals while reducing the influence on the main signal, achieving higher signal-to-noise ratio through averaging processes.
Implementation Method 1
a photoelectric conversion unit that converts the optical signals into electrical signals
Data Source
AI summary
An optical access system includes an optical transmission device and an optical reception device. In the optical access system, the optical transmission device includes: a signal generation unit that generates a plurality of optical signals by generating monitoring control signals including identical information in predetermined cycles and superimposing the monitoring control signal on a main signal each time generating the monitoring control signal; and a transmission unit that transmits the generated optical signals to the optical reception device. The optical reception device includes: a photoelectric conversion unit that converts the optical signals into electrical signals; an analog-to-digital converter that generates quantized data of a plurality of monitoring control signals by sampling a plurality of electrical signals including the plurality of monitoring control signals; an averaging processing unit that performs an averaging process on a plurality of pieces of the generated quantized data; and a demodulation unit that demodulates the monitoring control signals, using the plurality of pieces of the quantized data subjected to the averaging process.