EA Modulator Side-Face Inductor Layout for Wider Passband
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Solution Overview
Problem
The existing high-impedance line portion in optical communication devices occupies a large area, limiting the expansion of the signal passband in electroabsorption modulators without increasing the substrate area.
Innovation Solution
The optical communication device configures the laser diode and electroabsorption modulator on the front or back surface of the high-frequency line substrate, with a pattern line having an inductance component formed on the side face, allowing for a wider signal passband without increasing the substrate area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-impedance line portion is formed on the same plane as the EA portion, then the signal passband in the EA modulator is expanded, but the area of the substrate increases
Solution Approach 1:
The pattern line is formed on the side face of the substrate rather than on the front or back surface planes. This three-dimensional arrangement allows the high-impedance line to provide inductance for expanding the signal passband while occupying vertical space instead of horizontal substrate area, thus resolving the contradiction between passband expansion and substrate area conservation
Solution Approach 2:
The pattern line with inductance component is integrated into the side face structure of the substrate, effectively nesting the high-impedance line within the existing substrate volume. This allows the inductance component to be incorporated without adding to the footprint area, maintaining compact device dimensions while achieving the desired signal passband expansion
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 widens the signal passband in the electroabsorption modulator, maintaining the substrate area while enhancing the passband performance.
Implementation Method 1
an electroabsorption modulator that modulates light output from a laser diode on the basis of a high-frequency signal
Data Source
AI summary
An optical communication device is configured to include: a laser diode that outputs light; an EA modulator including a cathode and an anode, to modulate the light output from the laser diode on the basis of a high-frequency signal applied between the cathode and the anode; a resistor connected between the cathode and the anode; and a pattern line connected in series with the resistor and having an inductance component, in which each of the laser diode and the EA modulator is formed on a front surface of the high-frequency line substrate or a back surface of the high-frequency line substrate, and the pattern line is formed on a side face of the high-frequency line substrate.