DBR Tunable Laser Diode Vertical Electrode Overlap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing DBR tunable laser diodes face limitations in efficiently tuning the wavelength of laser light, as they lack effective mechanisms for simultaneous electrical and thermal tuning.
Innovation Solution
A distributed Bragg reflector tunable laser diode is designed with a substrate that includes a gain section and a distributed reflector section, featuring gratings, a current injection electrode, and a heater electrode that vertically overlap, allowing for electrical and thermal tuning of the laser light wavelength by adjusting the refractive index of the passive waveguide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a typical DBR tunable laser diode structure is used, then the device can operate as a longitudinal single-mode light source, but the wavelength tuning efficiency is limited due to lack of simultaneous electrical and thermal tuning mechanisms
Solution Approach 1:
The patent combines electrical tuning (via current injection electrode) and thermal tuning (via heater electrode) mechanisms into a single DBR laser diode structure. The current injection electrode and heater electrode are both disposed on the passive waveguide, allowing simultaneous or independent operation to achieve comprehensive wavelength tuning coverage and improved tuning efficiency.
Solution Approach 2:
The passive waveguide serves multiple functions: it guides the laser light, provides a platform for both electrical and thermal tuning mechanisms, and enables the DBR structure to achieve both fast electrical tuning and fine thermal adjustment. This multi-functional design enhances the overall adaptability and tuning capability of the laser device.
2Speed
If only electrical tuning is implemented, then fast wavelength adjustment is achieved, but the tuning range and precision are limited
Solution Approach 1:
The patent merges electrical tuning (fast response) and thermal tuning (fine adjustment and extended range) mechanisms. The current injection electrode provides fast wavelength adjustment, while the heater electrode extends the tuning range and enables fine precision control, complementing each other to overcome the limitations of either mechanism alone.
3Adaptability or versatility
If only thermal tuning is implemented, then extended wavelength range is achieved, but the tuning speed becomes slow
Solution Approach 1:
The patent combines thermal tuning (for extended range) and electrical tuning (for fast response) mechanisms. The heater electrode enables extended wavelength range adjustment, while the current injection electrode provides fast tuning response, allowing the system to achieve both broad coverage and rapid adjustment by operating the two mechanisms in coordination.
4Productivity
If multiple tuning mechanisms are added, then tuning efficiency improves, but the device structure becomes more complex
Solution Approach 1:
The patent integrates multiple tuning mechanisms (current injection electrode and heater electrode) onto the passive waveguide in a compact arrangement. Both electrodes are disposed on the same waveguide structure, sharing common support infrastructure and control circuits, which reduces overall system complexity while maintaining high tuning efficiency through coordinated operation.
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 enables efficient tuning of the laser light wavelength, allowing for both reduction and increase of wavelength by current injection and heating, respectively, enhancing the tunability of the laser diode.
Implementation Method 1
a current injection electrode disposed on the passive waveguide and configured to provide a current into the passive waveguide to electrically tune a wavelength of the laser light
Implementation Method 2
a heater electrode disposed on the current injection electrode and configured to heat the passive waveguide to thermally tune the wavelength of the laser light
Implementation Method 3
gratings disposed on or under the passive waveguide
Data Source
AI summary
Provided is a distributed Bragg reflector tunable laser diode including a substrate provided with a gain section having an active waveguide from which a gain of laser light is obtained and a distributed reflector section having a passive waveguide connected to the active waveguide, wherein the distributed reflector section includes gratings disposed on or under the passive waveguide, a current injection electrode disposed on the passive waveguide and configured to provide a current into the passive waveguide to electrically tune a wavelength of the laser light, and a heater electrode disposed on the current injection electrode and configured to heat the passive waveguide to thermally tune the wavelength of the laser light, wherein the gratings, the current injection electrode, and the heater electrode vertically overlap each other.