Light Source Assembly Direct Coupling to CMOS Chip
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Solution Overview
Problem
Conventional copper data channels face limitations due to signal attenuation and crosstalk from radiated electromagnetic energy, requiring significant power, complexity, and bulk, which are mitigated only modestly by existing techniques, while optical communication offers a more scalable and reliable alternative.
Innovation Solution
A light source assembly is integrated directly with a CMOS chip, comprising a laser, microlens, turning mirror, and polarization control elements, enabling efficient coupling of optical signals into grating couplers on the chip, thereby eliminating the need for external modulators and reducing assembly costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If copper data channels are used for high data rate transmission, then signal transmission can be achieved, but signal attenuation and crosstalk increase significantly
Solution Approach 1:
The patent replaces electrical signal transmission through copper channels with optical signal transmission through optical fibers. This substitution eliminates the fundamental limitations of copper channels (signal attenuation and crosstalk) by using light-based transmission, enabling high data rates with superior signal integrity over long distances.
2Reliability
If equalization, coding, and shielding techniques are applied to copper channels, then signal quality improves modestly, but power consumption and system complexity increase considerably
Solution Approach 1:
Instead of applying complex electrical signal processing techniques (equalization, coding, shielding) to mitigate copper channel limitations, the patent substitutes the entire transmission medium with optical fibers. This fundamental replacement achieves superior signal quality without requiring the complex auxiliary systems needed for copper channels.
3Length of stationary object
If equalization, coding, and shielding are implemented, then reach is improved modestly, but cable bulk and power requirements increase
Solution Approach 1:
The patent replaces copper cable infrastructure with optical fiber cables. Optical fibers achieve dramatically longer transmission reaches without signal degradation and require significantly less cable bulk due to their lower attenuation characteristics, eliminating the need for frequent repeaters and reducing overall system infrastructure.
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 integration enhances signal integrity, reliability, and scalability, reducing assembly costs and power consumption, while enabling high-speed optical data transmission with improved reliability and efficiency.
Implementation Method 1
A light source assembly affixed to a CMOS chip may comprise a laser
Implementation Method 2
a microlens, which may focus an optical signal from the laser
Data Source
AI summary
Methods and systems for a light source arrangement supporting direct coupling to a photonically enabled complementary metal-oxide semiconductor (CMOS) chip are disclosed. The arrangement may include a laser, a microlens, a turning mirror, reciprocal and/or non-reciprocal polarization rotators, and an optical bench. The laser may generate an optical signal that may be focused utilizing the microlens. The optical signal may be reflected at an angle defined by the turning mirror, and may be transmitted out of the light source arrangement to one or more grating couplers in the chip. The laser may include a feedback insensitive laser. The light source arrangement may include two electro-thermal interfaces between the optical bench, the laser, and a lid affixed to the optical bench. The turning mirror may be integrated in a lid affixed to the optical bench or may be integrated in the optical bench.