Optical Communication Pulse Width Control for Signal Overlap Prevention
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Solution Overview
Problem
In communication systems where multiple slave devices share a communication line, there is a risk of transmission signals overlapping, leading to impaired communication.
Innovation Solution
A communication system where a master device transmits first pulse light with a width shorter than two times the shortest distance between slave devices, and each slave device modulates the pulse light to output it as return light, allowing the master device to receive information from the slave devices without signal overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple slave devices share a communication line using time division demultiplexing, then cost is reduced and communication efficiency is improved, but signal overlap may occur leading to communication impairment
Solution Approach 1:
The patent applies periodic action by using pulse light with a specifically controlled width that is shorter than two times the shortest distance between slave devices. This periodic pulse transmission ensures that signals from different slave devices do not overlap in time, allowing multiple devices to share the communication line reliably while maintaining high communication efficiency
2Ease of operation
If a master device transmits inquiry commands to slave devices in order, then transmission timing control is achieved, but device complexity increases due to unique number allocation and detection mechanisms
Solution Approach 1:
The patent applies self-service by enabling slave devices to automatically respond to inquiry commands based on their unique identification numbers without requiring complex centralized scheduling. Each slave device independently detects whether an inquiry is addressed to it and responds accordingly, simplifying the overall system operation while maintaining timing control
3Reliability
If collision detection is used in optical fiber communication, then transmission errors are detected, but communication efficiency deteriorates because collision occurrence must be informed from master device
Solution Approach 1:
The patent applies preliminary anti-action by preventing collision before it occurs through careful selection of pulse width. By ensuring the pulse width is shorter than two times the shortest distance between slave devices, the system proactively avoids signal overlap, eliminating the need for collision detection and retransmission protocols, thus maintaining high communication efficiency while ensuring reliable transmission
Data Source
AI summary
In order to avoid the phenomenon of communication being impeded and signals transmitted by the plurality of slave devices overlapping, a communication system according to the present invention has the first master device transmits a first pulsed light to the first transmission path and receives a return light of the first pulsed light from the second transmission path; each of the slave devices modulates the first pulsed light, and outputs the modulated first pulsed light as the return light of the first pulsed light; and the width of the first pulsed light is narrower than double the shortest distance from among the transmission distance between the slave device outputting the return light and the transmission distance between the first master device and the slave device outputting the return light.