Thermally Floating DBR Laser Wavelength Selection Region
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Solution Overview
Problem
Conventional DBR laser diodes experience spectral mode hopping due to temperature changes, leading to discontinuous wavelength tuning, which is undesirable for certain applications.
Innovation Solution
The wavelength selection region is thermally floating relative to the gain region, allowing it to maintain the same temperature and track the peak gain passively, preventing mode hops by adjusting reflectivity in sync with thermally induced changes in the gain region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wavelength selection region is thermally coupled to the gain region, then temperature control is simplified, but spectral mode hopping occurs due to temperature changes
Solution Approach 1:
The laser device is segmented into two distinct thermal zones: the gain region is thermally coupled to the substrate for active temperature control, while the wavelength selection region is thermally isolated (floating) to passively track the gain region temperature. This segmentation allows each region to have optimized thermal characteristics, preventing mode hopping without requiring complex active thermal management of the entire device.
Solution Approach 2:
The patent introduces an intermediary thermal isolation layer (such as an air gap or low thermal conductivity material) between the wavelength selection region and the substrate. This intermediary prevents direct thermal coupling, allowing the wavelength selection region to thermally float and maintain the same temperature as the gain region through passive heat transfer, thereby eliminating mode hops.
2Reliability
If the wavelength selection region is thermally floating, then mode hops are prevented, but manufacturing complexity increases
Solution Approach 1:
The wavelength selection region is designed to be self-regulating through passive thermal floating. It automatically tracks the temperature of the gain region without requiring external active control mechanisms, complex manufacturing steps, or additional control electronics. The structure itself provides the temperature tracking function through its thermal isolation design.
3Temperature
If active cooling is applied to the wavelength selection region, then temperature stability is improved, but device complexity and power consumption increase
Solution Approach 1:
The wavelength selection region uses passive thermal floating to automatically maintain temperature stability by tracking the gain region temperature. This eliminates the need for active cooling systems, thermoelectric coolers, or temperature control electronics in the wavelength selection region, significantly reducing power consumption while maintaining temperature stability.
Solution Approach 2:
The patent extracts the active temperature control requirement from the wavelength selection region, removing the need for separate cooling systems. Only the gain region requires active cooling, while the wavelength selection region relies on passive thermal coupling to the gain region, reducing overall system complexity and power consumption.
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 a wide mode-hop-free spectral tuning range, preventing spectral mode hops and allowing continuous wavelength tuning, as demonstrated by the elimination of sudden jumps in optical frequency with varying drive currents.
Implementation Method 1
the wavelength selection region is thermally floating relative to the gain region, allowing it to maintain the same temperature
Implementation Method 2
adjusting reflectivity in sync with thermally induced changes in the gain region
Data Source
AI summary
Laser with extended mode-hop free spectral tuning ranges and methods for manufacturing such lasers are disclosed. In an embodiment the method includes providing a light emitting device, the light emitting device comprising a gain region and a first wavelength selection region and mounting the light emitting device on a thermally conductive carrier such that the gain region is mounted on a first carrier surface and the first wavelength selection region is arranged over and spaced apart from a second carrier surface.