Dynamic Power and Modulation Management in Coherent Optical Networks
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Solution Overview
Problem
Conventional coherent optical communication networks operate with fixed modulation formats and forward error correction (FEC) rates, leading to inefficient use of spectral resources and power, as they cannot be optimized for diverse end-user requirements, resulting in wasted resources and energy consumption.
Innovation Solution
Implementing a power and modulation management system that dynamically controls transmission power and modulation modes, using an economic function to balance spectral efficiency and energy efficiency by relating power consumption to mutual information per symbol (MIPS), allowing for optimized resource distribution based on end-user power budgets and quality of service (QoS) requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coherent optical technology is used to support additional end users and enable higher data rates, then network capacity and spectral efficiency are improved, but energy consumption increases due to complex digital signal processing and high-order modulation requirements
Solution Approach 1:
The patent implements dynamic power and modulation management that adapts transmission parameters in real-time based on network conditions and user requirements. The system dynamically adjusts modulation formats (e.g., QPSK, 16-QAM, 64-QAM) and power levels to match actual demand, avoiding the static over-provisioning of conventional systems. This dynamic adaptation allows the network to achieve high capacity when needed while consuming minimal energy during low-demand periods.
Solution Approach 2:
The system changes operational parameters including modulation order, coding rate, and transmission power based on real-time conditions. By varying these parameters dynamically rather than maintaining fixed high-capacity settings, the system achieves high network capacity when required while significantly reducing energy consumption during normal operation. The management function continuously optimizes these parameters to balance capacity and energy efficiency.
2Device complexity
If fixed modulation formats and FEC rates are used in conventional coherent optical networks, then system complexity is reduced, but spectral resources and power are wasted due to inability to optimize for diverse end-user requirements
Solution Approach 1:
The patent segments the network into multiple service classes with different quality-of-service requirements. Each segment (or service class) receives optimized power and modulation allocation based on its specific needs. This segmentation allows the system to avoid applying high-capacity configurations to all users, thereby reducing overall energy waste while maintaining manageable system complexity through structured resource allocation.
Solution Approach 2:
The system applies different modulation formats and power levels to different users or service classes based on their specific requirements rather than using a uniform configuration. This local optimization ensures that each segment of the network consumes only the energy necessary for its specific function, eliminating the energy waste inherent in fixed configurations that must accommodate the highest-demand scenario for all users.
3Productivity
If high-order modulation formats are used to increase data rates, then spectral efficiency is improved, but energy consumption increases to maintain high signal-to-noise ratio
Solution Approach 1:
The system dynamically selects modulation formats based on real-time channel conditions and user requirements. Instead of permanently using high-order modulation formats that consume more energy, the system transitions between modulation orders (e.g., QPSK, 16-QAM, 64-QAM) as needed. This dynamic approach achieves high data rates when channel conditions permit while consuming less energy when conditions are poorer or demand is lower.
Solution Approach 2:
The patent changes the modulation order parameter based on operational conditions. By varying this parameter rather than maintaining a fixed high-order modulation format, the system achieves high spectral efficiency and data rates when necessary while reducing energy consumption during normal operation. The management function continuously adjusts this parameter to optimize the balance between data rate and energy consumption.
Data Source
AI summary
A method for automatic power and modulation management in a communication network includes (a) generating a discontinuous management function that is a weighted function of at least spectral efficiency and power consumption of the communication network, (b) determining, from the discontinuous management function, an optimal modulation format, an optimal forward error correction (FEC) rate, and an optimal output power of a transmitter of the communication network, which collectively achieve a maximum value of the management function, and (c) causing the transmitter to operate according to the optimal modulation format, the optimal FEC rate, and the optimal output power.