Optical Transmission Module Dielectric Block Stray Capacitance
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Solution Overview
Problem
Existing optical transmission modules experience significant degradation in frequency characteristics at high signal frequencies due to stray capacitance between the semiconductor plane and the temperature control surface, leading to dips in electro-optical response, which limits their bandwidth and waveform quality.
Innovation Solution
The optical transmission module incorporates a dielectric block with a vacant space between the semiconductor plane and the temperature control surface, filled with a dielectric substance, which reduces stray capacitance by increasing the relative dielectric constant, thereby improving frequency characteristics and extending bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the semiconductor plane is placed close to the temperature control surface for thermal management, then temperature control efficiency is improved, but stray capacitance increases causing degradation in frequency characteristics
Solution Approach 1:
A dielectric block is introduced as an intermediary substance between the semiconductor plane and the temperature control surface. This dielectric block has a high relative dielectric constant that reduces stray capacitance while its thermal conductivity is optimized to maintain effective heat dissipation. The dielectric block thus mediates between the conflicting requirements of thermal management and electrical performance.
Solution Approach 2:
The patent changes the physical and electrical parameters of the medium between the semiconductor plane and temperature control surface by using a dielectric block with specifically selected properties (high relative dielectric constant and appropriate thermal conductivity). This parameter change allows simultaneous achievement of reduced stray capacitance and maintained thermal control efficiency.
2Reliability
If the distance between the semiconductor plane and temperature control surface is increased to reduce stray capacitance, then frequency characteristics are improved, but thermal control efficiency deteriorates
Solution Approach 1:
Instead of simply increasing the distance, the patent changes the material parameters by introducing a dielectric block with high relative dielectric constant and optimized thermal conductivity. This allows maintaining a compact structure while achieving reduced stray capacitance and effective thermal control simultaneously.
Solution Approach 2:
The dielectric block functions as a composite material solution that combines electrical insulation properties (high dielectric constant for capacitance reduction) with thermal conduction properties (optimized thermal conductivity for heat dissipation). This composite approach resolves the contradiction between electrical and thermal requirements.
3Ease of manufacture
If conventional structures without dielectric blocks are used, then manufacturing is simpler, but stray capacitance causes significant degradation in high frequency performance
Solution Approach 1:
The dielectric block serves as an intermediary component that can be integrated into the existing manufacturing process. It mediates between the simple conventional structure and the need for high frequency performance, providing a straightforward solution that maintains manufacturing simplicity while dramatically improving frequency characteristics.
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 configuration enhances the frequency characteristic of the optical signal, reducing degradation and increasing the dip frequency, resulting in improved waveform quality and extended bandwidth up to 60 GHz, while also simplifying manufacturing and reducing component count.
Implementation Method 1
stray capacitance between the semiconductor plane and the temperature control surface
Implementation Method 2
filled with a dielectric substance, which reduces stray capacitance by increasing the relative dielectric constant
Implementation Method 3
a temperature regulating element provided between the dielectric block and the metal base in the first direction, the temperature regulating element being contacted with the thermal plane
Data Source
AI summary
An optical transmission module includes a metal base including a signal terminal which extends along a first direction, a dielectric block including a dielectric substance, the dielectric block having a semiconductor plane, an optical plane, and a thermal plane, the semiconductor plane and the optical plane being parallel to the first direction, the thermal plane crossing the first direction, and the semiconductor plane being provided between the optical plane and the thermal plane in the first direction, an optical semiconductor element mounted on the semiconductor plane, the optical semiconductor element being electrically connected with the signal terminal, a temperature regulating element provided between the dielectric block and the metal base in the first direction, the temperature regulating element being contacted with the thermal plane, and a lens mounted on the optical plane.