Optical Modulator Relay Substrate Shielding Radiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The transmission characteristics of electrical signals in optical modulator modules deteriorate due to cavity resonance phenomena caused by radiation components from lead pins, which affect the efficiency of signal transmission.
Innovation Solution
The implementation of a relay substrate with separate transmission lines and a shield to prevent radiation component interference, where the shield can be a plate member, a bonding wire, or a mesh-shaped member that covers or intersects over the radiation surface of the lead pins to suppress radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead pins are used to transmit electrical signals from the outside to the substrate, then electrical signal transmission is enabled, but cavity resonance phenomenon occurs causing deterioration of transmission characteristics
Solution Approach 1:
A relay substrate is introduced as an intermediary component between the lead pin and the signal electrode. The relay substrate receives the electrical signal from the lead pin and transmits it to the signal electrode through a transmission line, thereby mediating the signal path and preventing direct radiation from the lead pin that causes cavity resonance.
Solution Approach 2:
The harmful radiation component is extracted and isolated from the main signal path by using the relay substrate structure. The lead pin is separated from the substrate's signal electrode, and the transmission line on the relay substrate carries the signal without allowing radiation into the housing cavity, thus removing the source of cavity resonance.
2Reliability
If a shield is added to block radiation components, then transmission characteristics are improved, but device complexity increases
Solution Approach 1:
The relay substrate serves as a mediating structure that inherently prevents radiation without requiring additional shielding components. By routing the signal through the relay substrate's transmission line rather than directly from the lead pin to the substrate, the design achieves signal isolation and prevents cavity resonance without adding complex shielding structures.
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 deterioration of transmission characteristics by reducing radiation component interference, thereby maintaining signal integrity and efficiency.
Implementation Method 1
a shield that shields a radiation component of the electrical signal that is radiated from the second transmission line
Implementation Method 2
a substrate having an electro-optic effect, an optical waveguide that is formed on the substrate, an optical modulation element including a modulation electrode configured to modulate light that passes through the inside of the optical waveguide
Data Source
AI summary
Provided is an optical modulator including: a relay substrate; a first transmission line that is provided on a flat surface of the relay substrate, and transmits an electrical signal along the flat surface; a second transmission line that is provided separately from the relay substrate, is electrically connected to the first transmission line, and transmits, to the first transmission line, the electrical signal that has been input from an outer side in a direction that is not included in the flat surface; a modulation unit that modulates an optical signal by using the electrical signal that is transmitted by the first transmission line and the second transmission line; and a shield that shields a radiation component of the electrical signal that is radiated from the second transmission line.