PIC Tunable Laser Control for Frequency Grid Alignment

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Solution Overview

Problem

Lasers on photonic integrated circuit (PIC) dies vary in frequency, leading to misalignment with communication protocol channels, which affects the alignment and efficiency of optical communication systems.

Innovation Solution

A system with temperature and current control mechanisms adjusts the frequency of lasers on PIC dies by using a temperature control device and control circuitry to align them with a communication protocol frequency grid, employing methods such as PID control loops and fine-tuning of laser drive currents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If lasers are fabricated on PIC dies, then integration density and productivity are improved, but frequency alignment precision deteriorates due to manufacturing variations

Engineering Contradiction:

Improveintegration densityVSAvoidfrequency alignment

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by adjusting the drive current of each laser individually to shift its frequency. The control circuitry varies the current parameters for different lasers to compensate for manufacturing variations and achieve precise frequency alignment with the communication protocol channels, thereby resolving the contradiction between high integration density and frequency alignment precision.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If temperature control is applied to all lasers, then average frequency alignment is improved, but device complexity and power consumption increase

Engineering Contradiction:

Improveaverage frequency alignmentVSAvoidcontrol mechanism complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the frequency control into two levels: a global temperature control mechanism that adjusts the average frequency of all lasers, and individual current control for each laser to fine-tune specific frequencies. This segmented approach reduces overall system complexity compared to full individual control while maintaining precise frequency alignment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent merges temperature control and current control mechanisms to achieve frequency alignment. The temperature control device adjusts the average frequency of multiple lasers simultaneously, while the control circuitry combines this with individual current adjustments to achieve both average frequency alignment and individual channel alignment, resolving the contradiction between alignment precision and device complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Manufacturing precision

If individual current control is applied to each laser, then frequency alignment precision is improved, but power consumption and device complexity increase

Engineering Contradiction:

Improvefrequency alignmentVSAvoidpower consumption

Core Design Contradiction:

Manufacturing precisionVSUse of energy by moving object

Solution Approach 1:

The patent segments the control approach into global temperature control for average frequency adjustment and individual current control only where needed for channel alignment. This reduces overall power consumption compared to continuous individual control of all lasers, while maintaining precise frequency alignment through targeted current adjustments.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses parameter changes in drive current as an efficient means to adjust laser frequencies. By changing the current parameter individually for each laser based on measured frequency deviations, the system achieves precise alignment with minimal power consumption, avoiding the need for more power-intensive alternative control methods.

Inventive Principle:

Principle #35Parameter changes

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

The system effectively aligns laser frequencies with communication channels, enhancing signal-to-noise ratio and communication bandwidth while potentially prolonging laser lifetime or increasing power efficiency.

Implementation Method 1

a temperature control device to adjust a frequency of the plurality of lasers

Methodology Applied

Scientific EffectThermal control of laser frequency:

Implementation Method 2

control circuitry to control a frequency for individual lasers of the plurality of lasers

Methodology Applied

Scientific EffectCurrent control of laser frequency:

Data Source

PatentUS20250286346A1Technologies for tunable lasers in photonic integrated circuit dies

Publication Date: 2025.09.11 INTEL CORP

AI summary

Technologies for tunable lasers in a photonic integrated circuit (PIC) die are disclosed. In an illustrative embodiment, a system includes one or more PIC dies with several lasers and a temperature control device such as a thermoelectric device. Control circuitry can control the temperature control device to tune an average frequency of the lasers on the PIC die, and the control circuitry can control laser driver current to further tune the frequency of individual lasers of the PIC die. The control circuitry can align the lasers of the PIC die to channels on a grid for a communication protocol. Light from the lasers can be modulated within the channels to communicate information.