Optical Modulator Integrated Laser Layout for Impedance Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing bandwidth of semiconductor light-emitting devices leads to impedance mismatch, resulting in signal loss and inadequate transmission of modulation signals to optical modulation elements.
Innovation Solution
The integration of an optical modulator with a laser unit and a modulation unit, including signal and ground potential pads, where the modulation signal is connected to a wire holding ground potential, reducing impedance mismatch and signal loss by ensuring the signal progresses alongside the ground potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bandwidth of semiconductor light-emitting devices is increased, then the transmission capacity is improved, but impedance mismatch occurs causing signal loss
Solution Approach 1:
The patent applies equipotentiality by providing a ground potential line extending from the signal line through the optical modulation unit to the modulation signal input terminal. This creates a continuous reference potential path that maintains impedance consistency throughout the signal transmission path, preventing impedance mismatch and signal loss while enabling high-bandwidth operation.
2Reliability
If the ground potential line is extended through the optical modulation unit, then impedance mismatch is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the ground potential line with the existing signal transmission path by extending it through the optical modulation unit alongside the signal line. This integration approach maintains impedance matching without adding separate independent grounding structures, thereby reducing overall device complexity while improving reliability.
Data Source
AI summary
An optical modulator integrated semiconductor laser includes a laser unit outputting a laser beam, an optical modulation unit modulating the laser beam, a signal pad for connection to a first wire for inputting a modulation signal to the optical modulation unit, and a first pad for connection to a second wire holding a ground potential.