Flexible Laser Driver ASIC for Low-Noise Current and Voltage Compliance
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Solution Overview
Problem
Current quantum systems face challenges due to demanding laser requirements, leading to the need for costly and bulky 'research-grade' lasers and electronics, which are not scalable and become less reliable and more expensive as the laser count grows.
Innovation Solution
An integrated circuit (ASIC) design that includes a user-controllable laser driver with external connections for sense resistors and transistors, allowing for flexibility in accommodating different laser types and optimizing noise and voltage compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If commercially available integrated circuits are used for laser operation, then cost is reduced and device size is minimized, but noise requirements and voltage compliance are insufficient for quantum systems
Solution Approach 1:
The patent segments the laser driver functionality into modular components: a core integrated circuit providing basic current drive, with separate external components (precision resistors, low-noise voltage references, compliance voltage regulation) that can be selectively added to achieve ultralow noise performance without paying for unnecessary features in all cases.
Solution Approach 2:
The patent introduces external precision resistors and low-noise voltage reference circuits as intermediary components between the commercial IC and the laser diode. These intermediaries filter out noise and provide stable voltage compliance, enabling quantum-grade noise performance while using commercially available core electronics.
2Reliability
If research-grade lasers and electronics are used to meet demanding laser requirements, then noise performance and voltage compliance are improved, but device size increases and cost increases
Solution Approach 1:
The patent merges commercial off-the-shelf integrated circuit technology with selectively added precision components to create a hybrid solution that achieves research-grade noise performance without the full cost and size of complete research-grade laser systems.
Solution Approach 2:
The patent creates a universal laser driver platform based on commercial ICs that can be adapted through external components to serve multiple quantum applications with different noise and voltage requirements, eliminating the need for application-specific custom designs.
3Adaptability or versatility
If the number of lasers in quantum systems increases, then system functionality is improved, but reliability decreases and cost increases exponentially
Solution Approach 1:
The patent develops a universal laser driver module using commercial ICs that can be replicated and scaled to drive multiple lasers with consistent performance. This standardized approach ensures that each laser channel has identical reliability characteristics, preventing the exponential degradation that occurs with custom designs.
Solution Approach 2:
The patent employs commercially available integrated circuits that can be easily replaced if needed, rather than relying on expensive custom-designed electronics. This approach makes the system more resilient to failures and simplifies maintenance in scaled quantum systems.
Data Source
AI summary
Embodiments herein describe an ASIC design where certain portions of the laser driver are controllable by the user. In one embodiment, the ASIC may include one or more pins which provide a connection interface where the user can electrically connect a sense resistor that corresponds to the particular laser being used. The remaining portions of the laser driver are implemented in the ASIC, thereby giving the user the flexibility to adapt the laser driver to her selected laser while having the advantages that come from using an ASIC.