Light Detection Module Wavelength Stabilization
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Solution Overview
Problem
Adjustable lasers in DWDM systems experience wavelength drift, which can lead to channel offset, necessitating effective wavelength lock technology for stability, especially in large-scale commercial use.
Innovation Solution
A light detection module comprising a beam splitter, first and second optical sensors, and an optical resonator, where the optical resonator and second optical sensor are on a straight line parallel to the TO base, allowing for precise detection and adjustment of wavelength changes using the difference in current signals from both sensors to control the laser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adjustable laser is used in DWDM system, then flexibility and supply speed of light waves are improved, but wavelength stability deteriorates due to drift
Solution Approach 1:
The patent implements a feedback control system using an optical resonator (Fabry-Perot etalon) to detect wavelength drift and generate correction signals. The resonator transmits only specific wavelength components, and the transmitted light intensity is detected by a photodetector to generate feedback signals that control the laser current, thereby stabilizing the wavelength despite drift tendencies
Solution Approach 2:
The patent changes the operating parameter of the laser by dynamically adjusting the injection current based on detected wavelength drift. The system monitors wavelength variations and modifies the current parameter in real-time to compensate for drift, maintaining stable wavelength output while preserving the adjustable laser's flexibility
2Stability of the object's composition
If wavelength detection and correction system is added, then wavelength stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the wavelength detection and correction functions into a compact integrated module. The optical resonator, photodetector, and control circuitry are combined in a single assembly that interfaces directly with the laser, reducing the need for separate external components and simplifying the overall system architecture
Solution Approach 2:
The optical resonator serves as an intermediary element that simplifies the detection mechanism. Instead of requiring complex spectral analysis equipment, the resonator acts as a wavelength-selective filter that converts wavelength information into intensity variations detectable by a simple photodetector, thereby reducing system complexity
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
The module effectively stabilizes the wavelength of adjustable lasers by detecting and correcting drifts, ensuring reliable operation and reducing the risk of channel offset, with a compact design facilitating easy integration and efficient temperature management.
Implementation Method 1
a beam splitter configured to split an incident light beam into a first light beam and a second light beam
Implementation Method 2
an optical resonator in the second light path between the splitter and the second optical sensor
Data Source
AI summary
A light detection module includes: a TO base and a TO cap; wherein the TO base is fixedly provided thereon with a first optical sensor, a support frame and a support base; the support frame is fixedly provided thereon with a beam splitter, and the beam splitter and the first optical sensor are at an angle of 45 degrees; an upper surface of the support base is fixedly provided thereon with an optical resonator and a second optical sensor, the optical resonator is located between the beam splitter and the second optical sensor, and the optical resonator, the second optical sensor and the beam splitter are on a straight line parallel to a surface of the TO base; and the TO cap is provided thereon with an opening, and the opening, the first optical sensor and the beam splitter are on a straight line perpendicular to the surface of the TO base.