Optical Ring Network Communication Control Using Time Division Multiplexing
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Solution Overview
Problem
Conventional optical ring network systems face economic inefficiency due to the need for increasing the number of wavelengths as the number of communication paths grows, as they rely on the OADM technique for multiplexing optical signals.
Innovation Solution
Implementing a communication method that uses time division multiplexing on at least one wavelength, where one communication apparatus acts as a master to assign transmission timing to others, allowing all optical transmission apparatuses to communicate without the need for additional wavelengths, even when the number of connected apparatuses increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the OADM technique is used to multiplex optical signals in an optical ring network, then communication among optical transmission apparatuses can be established, but the number of wavelengths must be increased as the number of communication paths increases, leading to economic inefficiency
Solution Approach 1:
The patent merges multiple wavelength channels into a single wavelength by using time division multiplexing. Multiple optical transmission apparatuses share one wavelength resource by transmitting at different time slots, thereby combining the functionality of multiple wavelengths into a single wavelength channel and reducing the total number of wavelengths needed in the network
Solution Approach 2:
The patent implements periodic time division multiplexing where optical signals from different apparatuses are transmitted in periodic time slots. Each apparatus is assigned specific time windows for transmission, creating a periodic pattern of signal transmission that allows multiple apparatuses to share a single wavelength resource efficiently
Data Source
AI summary
There is provided a communication method used in a communication system in which a plurality of communication apparatuses is connected by an optical ring network, the communication method including: setting one of the plurality of communication apparatuses as a master communication apparatus and the other communication apparatuses as slave communication apparatuses, causing the master communication apparatus to transmit an optical signal at transmission timing determined in the master communication apparatus; causing the master communication apparatus to transmit an assignment signal for assigning, to the slave communication apparatuses, transmission timing at which an optical signal on at least one wavelength is time-division multiplexed and transmitted; and causing the slave communication apparatuses to transmit an optical signal to the optical ring network based on transmission timing assigned by the assignment signal received from the master communication apparatus. As a result, the number of wavelengths needed for communication is reduced, and even when communication paths increases due to an increase in the number of optical transmission apparatuses, there is no need to increase the number of wavelengths, thereby solving the problem in economic efficiency.