Optical Semiconductor Driving Circuit With Segmented Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical semiconductor devices face challenges with high power consumption and accuracy demands in FETs due to through currents when maintaining '1' or '0' states, and require precise internal conductance values for voltage application, which is difficult to achieve with pre-emphasis circuits.
Innovation Solution
The optical semiconductor device employs a driving circuit with a first and second switching circuit to independently charge and discharge an electric-optic conversion element, using switches with specific internal conductance relationships to minimize through currents and maintain accurate voltage application, thereby reducing power consumption and improving signal waveform eye opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pre-emphasis circuit is used to maintain '1' or '0' states, then voltage application accuracy is improved, but power consumption increases due to through currents
Solution Approach 1:
The patent applies periodic action by using separate charge and discharge switching circuits that operate in alternating periods. The charge circuit charges the capacitance during a first period when the output is '1', and the discharge circuit discharges during a second period when the output is '0'. This periodic operation eliminates continuous through currents while maintaining voltage accuracy, thereby reducing power consumption.
2Measurement precision
If internal conductance values are precisely controlled in switching circuits, then voltage application accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the switching circuit into separate charge and discharge circuits with distinct switching elements. The charge circuit includes a charge switch and the discharge circuit includes a discharge switch, allowing independent control of charging and discharging processes. This segmentation simplifies the control logic compared to using precise internal conductance values in a single switching circuit, while maintaining voltage application accuracy.
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 through currents and enhances signal waveform eye opening by ensuring accurate voltage application and reduced power consumption, addressing the limitations of pre-emphasis circuits.
Implementation Method 1
Electrically, the phase modulator and the semiconductor laser are an electric-optic conversion element including a diode with a p-n junction
Data Source
AI summary
An optical semiconductor device includes: an electric-optic conversion element that is provided with a diode; and a driving circuit that drives the diode in a forward direction, the driving circuit including a first switching circuit that is provided with a first switch, and a second switching circuit that is provided with a second switch, wherein the first switching circuit constitutes a first signal line that charges the electric-optic conversion element with an electric charge by bringing the first switch into an ON state and the second switch into an OFF state, and the second switching circuit constitutes a second signal line that discharges the electric charge stored in the electric-optic conversion element by bringing the second switch into an ON state and the first switch into an OFF state.