Optical Backhaul Network Using WDM for Wireless Broadband
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Solution Overview
Problem
Conventional optical backhaul networks for wireless broadband services face inefficiencies due to the need for multiple point-to-point optical fiber connections between the center and access points, which increases costs and complexity as data transmission speeds and volumes grow.
Innovation Solution
An optical backhaul network utilizing wavelength division multiplexing (WDM) to transmit downlink optical signals in a broadcasting form and uplink optical signals with multiplexed wavelengths, efficiently connecting one center to multiple access points using a reduced number of optical fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If point-to-point optical fiber connections are used between the center and access points, then reliable data transmission is achieved, but the number of optical fibers increases and cost increases
Solution Approach 1:
The patent combines multiple point-to-point optical fiber connections into a single optical fiber by implementing WDM technology. Multiple wavelengths are multiplexed onto one fiber for upstream transmission from access points to the center, and downstream transmission uses a single wavelength broadcast on the same fiber. This merging approach maintains transmission reliability while dramatically reducing the number of optical fibers required.
Solution Approach 2:
The optical fiber is made universal by enabling it to carry multiple functions: it serves as both upstream and downstream transmission medium, and carries multiple wavelength channels simultaneously. The single optical fiber performs the work of multiple dedicated fibers through wavelength multiplexing, achieving multi-functionality that reduces infrastructure requirements.
2Productivity
If multiple optical fibers are deployed for point-to-point connections, then each access point gets dedicated bandwidth, but the network complexity and installation difficulty increase
Solution Approach 1:
The patent changes the parameter of wavelength to enable multiple data channels to coexist on a single optical fiber. By assigning different wavelengths to different access points for upstream transmission and using wavelength division multiplexing, the system maintains dedicated bandwidth capability while reducing physical fiber count and simplifying network configuration.
3Reliability
If conventional optical fiber connections are used, then point-to-point reliability is maintained, but cost and space requirements increase
Solution Approach 1:
Multiple optical fiber connections are merged into a single fiber through WDM technology. The patent combines upstream and downstream transmissions, and multiple access point connections, into one physical fiber infrastructure, significantly reducing the volume of optical fibers and associated infrastructure while maintaining connection reliability through wavelength-based channel separation.
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 approach reduces the number of optical fibers required between the center and access points, lowers costs by allowing for the use of low-cost band edge filters, and enhances connectivity while maintaining high data transmission speeds.
Implementation Method 1
an optical backhaul network based on wavelength division multiplexing (WDM) that efficiently connects one center and a plurality of APs by transmitting a downlink optical signal of a single mode in order to transmit the downlink optical signal in a broadcasting form
Implementation Method 2
a plurality of remote nodes (RNs) for outputting a part of the downlink optical signal to the ONUs and for outputting the uplink optical signal to the OLT
Data Source
AI summary
An optical backhaul network for a wireless broadband service is provided. The optical backhaul network for a wireless broadband service includes: a plurality of optical network units for outputting an uplink optical signal having a multiplexed wavelength; an optical line termination for outputting a downlink optical signal of a single mode in order to transmit the downlink optical signal to the plurality of the optical network units in a broadcasting form; and a plurality of remote nodes for outputting a part of the downlink optical signal to the plurality of the optical network units and for outputting the uplink optical signal to the optical line termination. Therefore, one center and a plurality of access points can be efficiently connected.