Optical Module Reflective Film Design for Laser Stability
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Solution Overview
Problem
The stability of optical modules is compromised due to excessive laser irradiation of the laser driving chip, leading to poor optical-to-electrical signal conversion and unstable operation, caused by reflective films coating the inner cavity walls and transmitting lenses.
Innovation Solution
The optical module design includes a lens component with a transmitting lens and a reflective film on its surface and inner cavity wall, where the reflective film is strategically reduced or absent in regions irradiated by secondarily reflected laser light, directing reflections into random directions and reducing light intensity on non-edge regions of the laser driving chip, thereby preventing interference with the clock data recovery circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If reflective film is coated on the inner cavity wall and transmitting lens, then light reflection efficiency is improved, but laser light excessively irradiates the laser driving chip causing stability degradation
Solution Approach 1:
The reflective film is selectively applied only to specific regions of the inner cavity wall and transmitting lens, rather than uniformly across all surfaces. This local quality approach ensures that light reflection is optimized in areas where it benefits optical performance, while avoiding regions where reflection would cause excessive irradiation of the laser driving chip, thus resolving the contradiction between reflection efficiency and system stability
Solution Approach 2:
The inner cavity wall and lens surfaces are divided into multiple regions with different reflective properties. Some regions have reflective film coating to enhance light collection and coupling efficiency, while other regions deliberately lack coating to allow light to escape or be absorbed, preventing excessive irradiation of the laser driving chip. This segmentation strategy balances optical efficiency with reliability
2Measurement precision
If reflective film is applied on transmitting lens surface, then optical signal transfer is improved, but clock data recovery circuit is interfered by excessive laser irradiation
Solution Approach 1:
The design intentionally allows certain reflected laser rays to reach the laser driving chip, where the harmful irradiation is converted into a beneficial function: the chip's non-edge regions act as secondary reflectors, redirecting the light away from the sensitive clock data recovery circuit. This transforms potential harm into a protective mechanism that preserves signal integrity
Solution Approach 2:
The edge regions of the laser driving chip serve as an intermediary element between the transmitting lens and the clock data recovery circuit. These edge regions receive the reflected laser light and redirect it away from the sensitive circuit areas, acting as a mediator that prevents direct harmful irradiation while maintaining the optical signal transfer function
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 design enhances the working stability of the optical module by minimizing excessive laser irradiation on the clock data recovery circuit, improving signal performance and reducing light interference.
Implementation Method 1
reflect, by the reflective film on the surface of the transmitting lens, a part of the laser light emitted by the laser
Implementation Method 2
reflect secondarily, by an edge region of the laser driving chip, the laser light reflected by the reflective film to be irradiated onto the inner cavity wall of the lens unit
Implementation Method 3
a transmitting lens for collimating and converging laser light emitted by the laser
Implementation Method 4
a transmitting lens for collimating and converging laser light emitted by the laser
Data Source
AI summary
The present application provides an optical module, including a laser, a laser driving chip, and a lens component disposed above the laser and the laser driving chip, where an inner cavity wall of the lens component that faces towards the laser and the laser driving chip is provided with a transmitting lens; a surface of the transmitting lens and the inner cavity wall around the transmitting lens are coated with a reflective film; and there is no reflective film coated on a part or entire of a region, of the inner cavity wall of the lens unit, which is irradiated by a secondarily reflected laser light.