Tape Electric Line for Laser Driver Voltage Drop
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Solution Overview
Problem
In underwater communication systems using 450 nm blue laser diodes, the length of the electric line between the laser driver and semiconductor laser increases voltage drop, making high-speed modulation difficult, while the need for cooling limits the proximity of the laser driver, thus restricting the reduction of electric line length.
Innovation Solution
A novel electric line structure with a tape-like configuration featuring stacked conductive and insulating layers reduces inductance and capacitance, allowing for efficient high-frequency current transmission and matching characteristic impedance, enabling high-speed modulation while maintaining cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the length of the electric line is reduced by disposing the laser driver proximate to the semiconductor laser, then the voltage drop is reduced, but the laser driver is blocked by the cooler, limiting the ability to dispose the laser driver proximate to the semiconductor laser
Solution Approach 1:
The electric line is transformed from a conventional three-dimensional routing into a two-dimensional planar structure by stacking conductive layers in the thickness direction. This dimensional change allows the electric line to bypass the cooler's physical obstruction while maintaining short electrical path length, thus reducing voltage drop without being blocked by the cooler.
Solution Approach 2:
The electric line is constructed as a composite structure with multiple conductive layers and insulating layers stacked together. This composite design provides both electrical conductivity and physical routing flexibility, enabling the electric line to achieve low inductance and low voltage drop while navigating around the cooler obstruction.
2Loss of energy
If a voltage applied by the laser driver is increased in order to compensate for the voltage drop at the electric line, then the voltage drop is compensated, but high speed modulation of laser light becomes difficult
Solution Approach 1:
By transforming the electric line into a stacked planar structure, the inductance is reduced due to the shortened current path in the thickness direction. This allows high-speed modulation to be achieved without requiring excessive compensation voltage, as the inherent inductance of the electric line is minimized through its geometric configuration.
Data Source
AI summary
A laser device includes: a semiconductor laser, at least one driver that supplies the semiconductor laser with a current; a modulator that modulates the current supplied to the semiconductor laser; and at least one electric line for conveying the current from at least one driver to the semiconductor laser. The at least one electric line is a wire in a form of a tape, and includes the first conductive layer, the second conductive layer, and the insulating layer which are extending in the longitudinal direction of the wire. The first conductive layer and the second conductive layer are stacked, with the insulating layer in between, in the direction of thickness of the wire.