Optical Communication Element Lid Segmentation
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Solution Overview
Problem
Optical communication components face performance degradation due to energy radiation and reflection issues within the package, particularly at the DC block portion, leading to noise and signal quality degradation, which is challenging to address with existing solutions like radio wave absorbers that also increase component count and cost.
Innovation Solution
The optical communication component design includes a package with a flat plate shape, separate regions for the optical communication element, electronic circuit element, and DC block device, and a lid with a separation projecting portion to confine energy radiated at unintended places, preventing noise return and performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC block device is embedded in the package to prevent DC signal damage, then electronic circuit element reliability is improved, but energy radiation and reflection occur at the DC block portion causing noise and signal quality degradation
Solution Approach 1:
The package is divided into separate regions: a first region for the DC block device, a second region for the optical communication element, and a third region for the electronic circuit element. This spatial segmentation prevents energy radiation from the DC block from affecting other components while maintaining the protective function.
Solution Approach 2:
A lid with a separation projecting portion is introduced as an intermediary structure. This projecting portion physically separates the DC block device region from the optical communication element and electronic circuit element regions, acting as a barrier to contain and guide electromagnetic energy, preventing its harmful radiation while allowing the DC block to function.
2Object-generated harmful factors
If separate regions are defined for different components, then energy radiation is contained and signal quality is improved, but device complexity increases due to additional lid structure
Solution Approach 1:
The lid serves multiple functions: it protects the internal components from environmental damage, provides structural support for the package, and through its separation projecting portion, acts as an electromagnetic energy barrier. This multi-functionality reduces the need for additional separate components to achieve energy containment.
Solution Approach 2:
The energy containment function is merged into the existing lid structure rather than being implemented as a separate component. The separation projecting portion is integrated directly into the lid, combining protective and energy containment functions in a single structural element.
3Reliability
If DC block device is placed on RF wiring, then DC signal is blocked protecting electronic circuits, but layout considerations require increased wiring width or distant GND electrodes increasing reflection and radiation
Solution Approach 1:
The package is segmented into distinct functional regions with the DC block device isolated in a first region separate from the RF wiring and electronic circuit elements. This segmentation allows the DC block to be positioned without requiring modifications to RF wiring layout, maintaining optimal wiring dimensions and grounding configurations.
Solution Approach 2:
The lid with separation projecting portion acts as an intermediary that enables the DC block device to be placed near RF wiring without causing harmful interactions. The projecting portion creates physical separation and guides electromagnetic energy, allowing close proximity placement while preventing reflection and radiation issues.
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 prevents energy radiation from causing noise and performance degradation, maintaining signal quality while reducing component complexity and cost, and is suitable for a wide temperature range.
Implementation Method 1
a capacitor component referred to as a DC block that allows a high-frequency signal to pass therethrough, but does not allow the DC signal to pass therethrough is needed on the RF wiring
Implementation Method 2
a lid with a separation projecting portion to separately define a region where the DC block device is present and a region where the optical communication element and the electronic circuit element are present
Data Source
AI summary
A COSA as an optical communication component that can prevent energy radiated in a package from causing performance degradation includes a DC block capacitor that is mounted on an upper surface of the package and located at a position different from those of a SiP chip and an optical modulator driver IC to cut off a DC signal included in a RF signal to be transmitted to the IC and a lid provided over an upper portion of the package. A separation projecting portion of the lid projecting toward an upper surface of the package separately defines a region where the capacitor is present and a region where the SiP chip and the IC are present. The separation projecting portion is connected to GND of the package, and the lid is at a GND potential.