Dynamic Wavelength Allocation for Optical Network Energy Efficiency
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Solution Overview
Problem
Conventional optical communication systems, such as TDM-PON and WDM-PON, inefficiently manage bandwidth by always using all allocated wavelengths, leading to unnecessary energy consumption and limited bandwidth expansion, especially in TDM-PON where upstream bandwidth is difficult to increase due to burst mode reception requirements.
Innovation Solution
A method and device in an optical terminal that dynamically selects and allocates wavelengths to optical network units based on network state conditions, including transmission bandwidth and subscriber positions, to optimize channel usage and reduce energy consumption by adjusting the number of used channels according to demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If all allocated wavelengths are used continuously in conventional optical networks, then wavelength availability is ensured, but energy consumption increases and bandwidth utilization becomes inefficient
Solution Approach 1:
The patent implements dynamic wavelength allocation where the OLT selectively activates or deactivates specific wavelength channels based on real-time bandwidth demands and subscriber requirements. This dynamic adjustment allows the system to transition from static full-channel usage to adaptive partial-channel usage, reducing energy consumption while maintaining necessary bandwidth capacity.
Solution Approach 2:
The system changes operational parameters by adjusting the number of active wavelength channels according to network conditions. The OLT monitors bandwidth usage and modifies the configuration of wavelength channels, switching between different channel states (active/inactive) to optimize the balance between energy efficiency and bandwidth availability.
2Productivity
If a single wavelength is used in TDM-PON, then device complexity is reduced, but upstream bandwidth expansion is limited due to burst mode reception requirements
Solution Approach 1:
The patent segments the single upstream wavelength channel into multiple wavelength channels for different ONUs. Instead of all ONUs sharing one wavelength in burst mode, each ONU is assigned a dedicated or dynamically allocated wavelength channel, eliminating burst mode reception requirements and enabling continuous upstream transmission, thereby increasing overall upstream bandwidth capacity.
Solution Approach 2:
The system transitions from time-division multiplexing (single wavelength, time-based separation) to wavelength-division multiplexing (multiple wavelengths, frequency-based separation). This dimensional change from time domain to frequency domain allows simultaneous upstream transmissions from multiple ONUs without burst mode constraints, significantly expanding upstream bandwidth.
3Productivity
If predetermined wavelengths are allocated to all channels in WDM-PON, then wavelength assignment is simplified, but bandwidth efficiency decreases when not all channels are needed
Solution Approach 1:
The OLT implements feedback mechanisms to monitor actual bandwidth usage and channel demand in real-time. Based on this feedback information, the system dynamically adjusts wavelength allocations, activating only the necessary channels and deactivating unused ones. This feedback-driven approach optimizes bandwidth utilization efficiency while adapting wavelength allocation management to actual network conditions.
Data Source
AI summary
Provided is an OLT including a wavelength splitter that splits all upstream optical signals with different wavelengths received from at least one ONU according to wavelength, at least one receiver that receive the optical signals split by the wavelength splitter according to wavelength, a wavelength selector that allocates an upstream transmission wavelength of the at least one ONU, and a transmitter that transmits wavelength allocation information allocated by the wavelength selector to the at least one ONU.