Variable-Wavelength Optical Transmitter for Fault-Tolerant PON
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Solution Overview
Problem
The complexity, size, and cost of optical communication systems increase when optical transceiving modules of active and standby systems are provided in optical line terminals (OLTs) to improve fault tolerance, making it difficult to cost-effectively manage high-density cellular networks with increasing mobile traffic.
Innovation Solution
An optical communication system is designed with a housing station, optical splitters, and optical network units (ONUs) that utilize variable-wavelength light sources and optical filters with shared transmission bands, allowing for continuous inter-cell cooperative transmission even when faults occur by switching to adjacent wavelengths, thereby simplifying the configuration and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical transceiving modules of active and standby systems are provided in OLTs to improve fault tolerance, then system reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the active and standby transceiving modules into a single integrated module. The single optical transceiving module dynamically switches between different wavelengths to serve multiple cells, eliminating the need for separate active and standby modules while maintaining fault tolerance through wavelength diversity and automatic switching capabilities.
Solution Approach 2:
The single optical transceiving module is designed to perform multiple functions by transmitting light at different wavelengths to different cells. It can dynamically allocate wavelengths based on cell status, serving both active and standby roles simultaneously, thereby reducing device complexity while maintaining reliability.
2Reliability
If optical transceiving modules of active and standby systems are provided in OLTs to improve fault tolerance, then system reliability is improved, but the size of OLT increases
Solution Approach 1:
The patent combines multiple transceiving functions into a single compact module, reducing the physical size of the OLT. The single module integrates wavelength switching, signal transmission, and fault handling capabilities that would traditionally require separate active and standby modules, thereby decreasing the overall OLT volume.
3Reliability
If optical transceiving modules of active and standby systems are provided in OLTs to improve fault tolerance, then system reliability is improved, but cost increases
Solution Approach 1:
The patent consolidates multiple expensive transceiving modules into a single unit, reducing material costs, manufacturing complexity, and maintenance expenses. The single module design eliminates redundant components while maintaining fault tolerance through intelligent wavelength management and automatic switching mechanisms.
Solution Approach 2:
The single optical transceiving module is designed to perform multiple roles (active transmission, standby protection, wavelength switching) that would traditionally require separate dedicated modules for each function, thereby reducing the total cost of system manufacturing and deployment.
4Device complexity
If variable-wavelength light sources and optical filters with shared transmission bands are used, then device complexity is reduced, but measurement precision may be affected
Solution Approach 1:
The patent employs precise wavelength tuning and switching mechanisms that dynamically adjust the operating wavelength to match the transmission bands of specific optical filters. This parameter control ensures accurate wavelength discrimination and signal routing despite the shared transmission bands, maintaining measurement precision while simplifying device configuration.
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 enhances fault tolerance and maintains inter-cell cooperative transmission in high-density cellular networks by allowing seamless wavelength switching, improving system availability without increasing complexity or cost.
Implementation Method 1
an optical transmitter 221 of which a transmission wavelength is variable and includes a light source 2211
Implementation Method 2
a first optical filter 611 having a first transmission band 801, 802 including a first wavelength 801 and a third wavelength 802
Data Source
AI summary
An optical communication system includes an optical transmitter, a plurality of optical receivers, and a splitter that splits light transmitted by the optical transmitter to the plurality of optical receivers. The optical transmitter includes a variable-wavelength light source capable of transmitting light of a first wavelength and light of a third wavelength between the first wavelength and a second wavelength. A first optical receiver of the plurality of optical receivers includes a first optical filter having a first transmission band including the first and third wavelengths, and a first receiving unit that receives light having passed through the first optical filter. A second optical receiver of the plurality of optical receivers includes a second optical filter having a second transmission band including the second and third wavelengths, and a second receiving unit that receives light having passed through the second optical filter.