Optical Communication Device Abnormal Light Emission Prevention
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Solution Overview
Problem
The existing Passive Optical Network (PON) systems face communication abnormalities due to optical signal collisions, which are costly to prevent using monitoring photoreceptor elements in optical communication devices.
Innovation Solution
An optical communication device with a communication unit, an abnormal light emission prevention unit, and a control unit that transmits data and transmission permission signals based on transmission band assignment information, stopping signal transmission when predetermined thresholds are exceeded to prevent abnormal light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a monitoring photoreceptor element is provided in the optical communication device to prevent communication abnormality, then the reliability of the PON system is improved, but the cost for the device increases
Solution Approach 1:
The patent extracts the monitoring function from a separate photoreceptor element and integrates it into the existing control unit. The control unit now monitors transmission timing and operation signals internally, eliminating the need for an additional monitoring photoreceptor element while maintaining abnormal light emission prevention capability
Solution Approach 2:
The control unit is given multiple functions: it not only controls the normal operation of the optical communication device but also performs monitoring of transmission timing and operation signals, and executes abnormal light emission prevention. This multi-functional approach eliminates the need for dedicated monitoring hardware
2Reliability
If transmission permission signals are continuously transmitted to prevent abnormal light emission, then the reliability is improved, but the loss of time in communication increases
Solution Approach 1:
The patent implements a feedback mechanism where the communication unit sends operation signals back to the control unit to report its operating state. The control unit compares the transmission timing of permission signals with the received operation signals to detect abnormalities. This feedback loop enables real-time monitoring without requiring continuous permission signal transmission, thus minimizing communication time loss
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
This solution effectively prevents abnormal light emission in slave station devices, reducing costs by eliminating the need for expensive monitoring photoreceptor elements while maintaining normal communication in PON systems.
Implementation Method 1
the communication unit transduces the data signal into an optical signal, transmits the transduced optical signal to the master station device
Data Source
AI summary
An ONU includes a communication unit, an abnormal light emission prevention unit, and a control unit that transmits a data signal and a transmission permission signal to the communication unit and transmits the transmission permission signal to the abnormal light emission prevention unit between a transmission start time and a transmission end time. When the transmission permission signal is received, the communication unit, transmits an optical signal to an OLT, and transmits an operation signal to the abnormal light emission prevention unit during the transmission of the optical signal. The abnormal light emission prevention unit transmits a stop signal to the communication unit when a difference between a time for which the transmission permission signal is received and a time for which the operation signal is received is greater than or equal to a threshold value. The communication unit stops when the stop signal is received.