Passive WDM Device for Automatic Wavelength Locking
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Solution Overview
Problem
Conventional wavelength division multiplexing passive optical networks (WDM-PON) face communication quality issues due to wavelength variations caused by external factors like temperature changes, leading to interrupted communication and increased channel setting times, as existing wavelength locking methods are inefficient and time-consuming.
Innovation Solution
A passive wavelength division multiplexing device with an optical multiplexer, splitter, optical filter, integrated optical receiver monitor, and wavelength-tunable optical transmitter that automatically locks the wavelength of optical signals to the maximum optical intensity, using frequency shift keying signals and polymer optical sub-assemblies to stabilize communication channels across tunable optical transceivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wavelength locking methods are used in WDM-PON, then wavelength stabilization is achieved, but locking time and channel setting time are excessively long
Solution Approach 1:
The patent applies preliminary action by pre-establishing wavelength reference information in the network management system before actual communication begins. The OLT pre-calculates and stores optimal wavelength settings based on environmental conditions, so when wavelength locking is needed, the system can quickly retrieve and apply pre-computed values rather than performing time-consuming real-time measurements and adjustments.
Solution Approach 2:
The patent replaces traditional mechanical/optical wavelength measurement and adjustment systems with an information-based system. Instead of using complex optical spectrum analyzers and manual adjustment mechanisms, the system uses digital wavelength reference information, data processing, and automated control signals to achieve rapid wavelength locking, substituting physical measurement mechanisms with information processing.
2Reliability
If wavelength locking is performed to maintain communication quality, then communication stability improves, but system complexity and implementation difficulty increase
Solution Approach 1:
The patent applies universality by designing the wavelength locking mechanism to serve multiple functions simultaneously. The same wavelength reference information and control procedures are used for both initial wavelength locking and continuous wavelength stabilization, and the system can handle multiple ONUs with different wavelength requirements using a unified management approach, reducing the need for separate specialized subsystems.
Solution Approach 2:
The patent introduces wavelength reference information as an intermediary element that mediates between the OLT and ONUs. This reference information acts as a common language and coordination mechanism that simplifies the interaction between different system components, enabling automatic wavelength adjustment without requiring complex direct communication and coordination protocols between all system elements.
3Adaptability or versatility
If manual or conventional automated wavelength adjustment is used, then wavelength can be adjusted, but communication channel setting time increases
Solution Approach 1:
The system performs preliminary calculation and storage of optimal wavelength settings in the network management system before actual channel establishment. When a new channel needs to be set up, the pre-computed wavelength information is immediately retrieved and applied, eliminating the need for time-consuming real-time wavelength search and adjustment procedures.
Solution Approach 2:
The system implements feedback mechanisms where the OLT monitors communication conditions and automatically adjusts wavelengths based on received signals from ONUs. The ONU transmits its identifier and the OLT uses this feedback to quickly determine and apply the appropriate wavelength from its reference information, creating a rapid closed-loop control system that accelerates channel setting.
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 ensures stable and optimized communication channels by reducing locking and channel setting times, providing robust wavelength locking that is independent of external environmental changes, thereby enhancing communication quality.
Implementation Method 1
an optical multiplexer which allows a light having a corresponding wavelength to be outputted to a plurality of optical network units when a predetermined wavelength of a light beam inputted thereto is synchronized to a passband
Implementation Method 2
an optical filter which allows the light beams splitted by the splitter to pass therethrough
Implementation Method 3
an integrated optical receiver monitor which detects an intensity of the light beams that have passed through the optical filter and converts the detected light beams into electrical signals
Implementation Method 4
a wavelength-tunable optical transmitter which allows a light beam having a specific wavelength to be inputted to the optical multiplexer while scanning the plurality of light beams having different wavelengths according to a temperature, and adjusts a wavelength of an optical signal to be outputted to the optical network units into a wavelength of an optical signal having a maximum optical intensity
Data Source
AI summary
The present invention relates to a passive wavelength division multiplexing device for automatic wavelength locking and a system thereof including an optical multiplexer, an optical filter, an integrated optical receiver monitor, and a tunable optical transmitter. Through wavelength locking that adjusts a wavelength of an optical signal, which changes according to an external environment such as a temperature change, into a wavelength of an optical signal having the maximum optical intensity, communication quality may be maximized by securing a stable communication channel, a locking time and a communication channel setting time may be reduced, and more robust locking may be guaranteed.