Optical Repeater Device Preamble Compensation WDM
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Solution Overview
Problem
Existing optical transmission systems face challenges with high costs and complexity due to the need for frequent OLT exchanges, inability to transmit signals of different wavelengths, and loss of preamble signals during long-distance transmission, which reduces throughput and increases costs.
Innovation Solution
An optical repeater device (ORD) with a preamble compensating circuit that extracts normal data signals from burst signals, adds preamble signals, and synchronizes them with a clock source, allowing for wavelength division multiplexing (WDM) using existing OLT and ONU equipment without changes, thereby maintaining throughput and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wavelength conversion is implemented using conventional methods with multiple 3(dB) couplers and opto-electric conversion devices, then wavelength division multiplexing capability is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple separate components (3(dB) couplers, opto-electric conversion devices, driver circuits) into a single integrated optical repeater device. This merging reduces the overall number of components, simplifies the system architecture, and lowers cost while maintaining wavelength conversion functionality through integrated photonic circuits.
Solution Approach 2:
The optical repeater device is designed to handle multiple functions within a single unit: it performs wavelength conversion, signal amplification, and preamble signal processing simultaneously. The device can process both upstream and downstream signals while providing WDM capability, making it a universal solution that replaces multiple specialized components.
2Length of stationary object
If conventional wavelength converters are used in long-distance transmission, then transmission distance is extended, but preamble signals are lost during transmission
Solution Approach 1:
The optical repeater device performs preliminary processing of incoming burst signals by detecting and extracting preamble signals before further wavelength conversion and transmission. This preliminary action ensures that preamble signals are preserved and can be reinserted or maintained throughout long-distance transmission, preventing the information loss that occurs in conventional systems.
Solution Approach 2:
The device implements feedback mechanisms to monitor the presence and integrity of preamble signals during transmission. By detecting preamble signals and providing feedback control, the system can adjust processing parameters to maintain preamble signal quality over long distances, ensuring that synchronization information is not lost.
3Productivity
If existing OLT and ONU equipment are modified to support WDM, then transmission capacity increases, but system change costs increase
Solution Approach 1:
The optical repeater device serves as an intermediary component that interfaces between existing OLT/ONU equipment and the WDM transmission network. It performs wavelength conversion on signals passing through it, enabling WDM capability without requiring modification of the endpoint equipment. This mediator approach allows legacy equipment to be used while achieving enhanced transmission capacity.
Solution Approach 2:
The solution segments the WDM implementation into modular optical repeater units deployed at intermediate points in the network, rather than requiring system-wide modification of all equipment. This segmentation allows incremental deployment and reduces overall system change costs by leaving existing OLT and ONU equipment unchanged.
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
Enables long-distance communication without decreasing transmission throughput and reduces system change costs by using existing equipment for WDM, eliminating the need for specialized modules for burst signals and allowing the use of low-cost components for continuous signals.
Implementation Method 1
it comprises opto-electric conversion devices 111 and 121 as light receiving elements
Data Source
AI summary
An optical transmission system is provided. The optical transmission system includes a user side optical repeater device (ORD), a central office side ORD, and wavelength multiplexing and wavelength de-multiplexing functions (MUX/DEMUX). The user side optical repeater device (ORD) is to be connected with a user side optical network unit (ONU), transmits data in two ways, and is used for wavelength division multiplexing (WDM). The central office side ORD is to be connected with a central office side optical line terminal (OLT), transmits data in two ways, and is used for WDM. The wavelength multiplexing and a wavelength de-multiplexing functions (MUX/DEMUX), are used for relaying between the user side ORD and the central office side ORD.