Variable Rate Optical Transmitter Subcarrier Control
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Solution Overview
Problem
Existing variable rate transmitters in optical WDM networks, particularly those using all-optical orthogonal frequency division multiplexing (O-OFDM) super-channel technology, face inefficiencies in power utilization and signal quality due to the generation of unnecessary subcarriers, leading to reduced transmission reach and flexibility.
Innovation Solution
A method is introduced that determines and applies an appropriate power level to a phase modulator to generate only the necessary number of subcarriers, utilizing a controller to optimize subcarrier generation and ensure uniform power distribution, thereby improving signal quality and reducing power waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the phase modulator operates at high power level to generate maximum subcarriers, then the transmitter can support higher data rates, but unnecessary subcarriers are generated causing power waste and reduced signal quality
Solution Approach 1:
The patent implements dynamic adjustment of the phase modulator's drive power level based on the required data rate. The controller continuously monitors the data rate requirement and adjusts the power level accordingly, transitioning the system from a static high-power operation to a dynamic adaptive operation that matches actual needs, thereby eliminating unnecessary subcarrier generation and optimizing power utilization.
Solution Approach 2:
The patent changes the drive power level parameter of the phase modulator dynamically according to the data rate requirement. By adjusting this key parameter, the system optimizes the number of generated subcarriers to match the actual data transmission needs, preventing both power waste from excessive subcarriers and insufficient data rate support.
2Productivity
If the phase modulator generates maximum number of subcarriers, then the transmitter achieves maximum spectral efficiency, but signal quality deteriorates due to power distribution across too many subcarriers
Solution Approach 1:
The system dynamically adjusts the number of active subcarriers by controlling the phase modulator's power level according to actual data rate requirements. This prevents the generation of excessive subcarriers that would dilute power distribution and degrade signal quality, while maintaining optimal spectral efficiency for the required data rate.
Solution Approach 2:
The patent adjusts the drive power parameter of the phase modulator to optimize the subcarrier generation. By changing this parameter dynamically, the system achieves the right balance between spectral efficiency (number of subcarriers) and signal quality (power per subcarrier), ensuring reliable transmission.
3Adaptability or versatility
If variable rate transmission is implemented in optical WDM networks, then network flexibility is improved, but transmitter complexity increases due to need for dynamic subcarrier control
Solution Approach 1:
The patent implements a universal controller that manages multiple functions: monitoring data rate requirements, determining optimal power levels, and controlling the phase modulator. This single multi-functional component provides variable rate capability without requiring separate complex control mechanisms for each function, thereby limiting the increase in overall transmitter complexity.
Solution Approach 2:
The system employs feedback control where the controller monitors the data rate requirement and adjusts the phase modulator power level accordingly. This closed-loop feedback mechanism enables automatic adaptation to different data rates, providing network flexibility while keeping the control architecture relatively simple through automated decision-making.
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 enhances power utilization, increases signal quality, and extends transmission distance by eliminating unnecessary subcarriers, while also providing flexibility and reducing operational costs through automatic control and minimal hardware modifications.
Implementation Method 1
a phase modulator, driven by a modulator driver, at an appropriate power level to generate only the necessary number of subcarriers
Data Source
AI summary
The present invention is directed to a method including determining an appropriate power level for a phase modulator for an optimum number of subcarriers; and applying the determined appropriate power level via a controller to produce the optimum number of subcarriers, wherein the optimum number of subcarriers enables an optical-orthogonal frequency division multiplex O-OFDM based variable rate transmitter with automatic control by a controller to produce an optimum setting based on a required rate.