Wavelength-Tunable Laser for Optical Modulator Stabilization
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Solution Overview
Problem
Existing optical communication systems face challenges in maintaining stable and high-sensitivity electro-optical modulation, especially in harsh environments, due to sensitivity to environmental perturbations and the complexity of local feedback control methods.
Innovation Solution
The implementation of a wavelength-tunable laser system with a control system that adjusts the optical carrier wavelength based on detected electronic signals to maintain modulation amplitude and RF power within specified ranges, using a remote stabilization approach that isolates the laser and photoreceiver from environmental perturbations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If local feedback control methods are used to stabilize electro-optical modulation, then modulation stability can be improved, but device complexity increases due to additional control components
Solution Approach 1:
The patent extracts the control function from the local modulator environment and relocates it to a remote location. The wavelength tunable laser, positioned away from the harsh environment, performs the stabilization function remotely by tuning its wavelength to track the resonant frequency of the modulator without requiring physical presence or additional control components at the modulator location.
Solution Approach 2:
The patent introduces an intermediary mechanism where the wavelength tunable laser acts as a mediator between the control system and the electro-optical modulator. By tuning the laser wavelength to match the modulator's resonant frequency, the system achieves stabilization indirectly through wavelength matching rather than direct feedback control at the modulator.
2Adaptability or versatility
If electro-optical modulators operate in harsh environments, then system versatility is improved, but reliability decreases due to sensitivity to environmental perturbations
Solution Approach 1:
The patent segments the system into two distinct parts: the wavelength tunable laser positioned in a controlled environment away from harsh conditions, and the electro-optical modulator deployed in the harsh environment. This spatial segmentation allows the sensitive laser to operate in stable conditions while the modulator handles environmental challenges, improving overall reliability.
Solution Approach 2:
The patent applies preliminary anti-action by pre-tuning the wavelength of the laser to match the resonant frequency of the modulator before deployment. The wavelength tunable laser continuously adjusts its wavelength to compensate for environmental perturbations, preventing degradation of modulation performance before it occurs.
3Measurement precision
If high sensitivity electro-optical modulation is achieved, then signal-to-noise ratio is improved, but power consumption increases
Solution Approach 1:
The patent changes the operating parameter of the laser from fixed wavelength to dynamically tunable wavelength. By adjusting the laser wavelength to precisely match the modulator's resonant frequency, the system maximizes modulation efficiency and signal-to-noise ratio without requiring increased power consumption, as the resonance enhancement provides the necessary sensitivity boost.
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 stabilizes optical modulation amplitude and RF power, reducing sensitivity to environmental fluctuations and simplifying the system by eliminating the need for local control components, thereby enhancing reliability and stability in harsh conditions.
Implementation Method 1
stabilizes optical modulation amplitude and RF power, reducing sensitivity to environmental fluctuations
Implementation Method 2
electro-optical modulator configured to receive the optical carrier from the wavelength tunable laser, receive an electronic input signal, and generate a modulated optical carrier
Data Source
AI summary
Various designs of optical interconnects and optical links may comprise one or more optically resonant electro-optical modulators used to modulate one or more optical carriers received from one or more lasers using one or more electronic input signals. A wavelength of each laser may be dynamically tuned using a control signal generated by a feedback control system to stabilize the electro-optical modulation of the optical carriers.