Optical Semiconductor Module Wiring for Wideband Signal Transmission
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Solution Overview
Problem
Existing optical semiconductor modules face challenges in achieving wideband frequency characteristics due to parasitic capacitance and transmission loss, especially when integrated with inductors and high-frequency wiring.
Innovation Solution
The optical semiconductor module incorporates a block made of low-permittivity material, an inductor connected via a wire with higher inductance, and a semiconductor laser device connected via a wire with lower inductance, all housed within a module that reduces parasitic capacitance and enhances frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inductor is mounted on the module to improve frequency characteristics, then the influence on high-frequency signals is reduced, but parasitic capacitance and transmission loss increase
Solution Approach 1:
The patent applies local quality by using a low-permittivity material specifically for the block mounting the inductor, while other parts of the module use different materials optimized for their specific functions. This localized material selection reduces parasitic capacitance in the inductor region without compromising the overall module performance.
Solution Approach 2:
The patent changes the permittivity parameter of the material used for the inductor block to a low value, which directly reduces parasitic capacitance. This parameter change allows the inductor to function effectively at high frequencies while minimizing energy loss through reduced capacitive coupling.
2Reliability
If wires with higher inductance are used to connect the inductor, then frequency characteristics are improved, but the wire length and parasitic capacitance increase
Solution Approach 1:
The patent applies local quality by assigning different inductance characteristics to different wire connections based on their specific functional requirements. The wire connecting the inductor has higher inductance optimized for frequency characteristics, while the wire connecting the semiconductor laser device has lower inductance for minimal signal interference.
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 effectively suppresses the influence of the inductor on high-frequency signals, achieving wideband frequency characteristics and reducing transmission loss, thereby enhancing the module's performance.
Implementation Method 1
a block (9) made of a low-permittivity material... effectively suppresses the influence of the inductor on high-frequency signals, achieving wideband frequency characteristics and reducing transmission loss
Data Source
AI summary
An optical semiconductor module according to the embodiment includes: a board including a transmission line; a block including a low-permittivity material; an inductor mounted on the block, the inductor being connected with the transmission line via a first wire, the first wire having a first inductance; a semiconductor laser device mounted on the board, the semiconductor laser device being connected with the transmission line via a second wire, the second wire having a second inductance smaller than the first inductance; anda housing configured to accommodate the board, the block, the inductor, and the semiconductor laser device.