Quantum Dot Coherent Comb Lasers for Stable Optical Tones

Solution Overview

Problem

Conventional communication networks relying on external mode-locking optical frequency comb light sources are complex and costly, limiting their stability and scalability for high-performance applications like coherent optics and mmWave technologies.

Innovation Solution

The use of a quantum dot (QD) coherent comb laser (CCL) that self-mode-locks, generating a stable optical frequency comb without external devices, simplifying and reducing the cost of converged communication networks while supporting high-performance technologies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If external mode-locking optical frequency comb light sources are used, then stable optical frequency comb can be generated, but device complexity and cost increase

Engineering Contradiction:

Improvestability of optical frequency combVSAvoidcomplexity of communication network

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The quantum dot coherent comb laser achieves self-mode-locking without requiring external mode-locking devices. The quantum dot structure inherently provides the necessary nonlinearity and gain characteristics to generate stable optical frequency combs autonomously, eliminating the need for separate mode-locking components and reducing overall system complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent combines the laser generation and mode-locking functions into a single quantum dot coherent comb laser device. By integrating these functions, the system eliminates the need for separate external mode-locking devices while maintaining stable optical frequency comb generation, thereby reducing device complexity and cost.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If external mode-locking optical frequency comb light sources are used, then stable optical frequency comb can be generated, but cost increases

Engineering Contradiction:

Improvestability of optical frequency combVSAvoidcost of communication network

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The quantum dot coherent comb laser achieves self-mode-locking without requiring external mode-locking devices. The quantum dot structure inherently provides the necessary nonlinearity and gain characteristics to generate stable optical frequency combs autonomously, eliminating the need for separate mode-locking components and reducing overall system complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent combines the laser generation and mode-locking functions into a single quantum dot coherent comb laser device. By integrating these functions, the system eliminates the need for separate external mode-locking devices while maintaining stable optical frequency comb generation, thereby reducing device complexity and cost.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If conventional optical frequency comb light sources are used, then communication network can operate, but scalability is limited

Engineering Contradiction:

Improvescalability of communication networkVSAvoidcomplexity of communication network

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The quantum dot coherent comb laser serves multiple functions simultaneously: it acts as both the light source and the mode-locking device, and can generate optical frequency combs suitable for various applications including coherent optics and mmWave technologies. This multi-functionality enhances the scalability and adaptability of communication networks.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The quantum dot coherent comb laser achieves self-mode-locking without requiring external mode-locking devices. The quantum dot structure inherently provides the necessary nonlinearity and gain characteristics to generate stable optical frequency combs autonomously, eliminating the need for separate mode-locking components and reducing overall system complexity.

Inventive Principle:

Principle #25Self-service

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 QD CCL provides a stable optical frequency comb, enabling efficient data transmission in converged communication networks with reduced complexity and cost, supporting advanced communication protocols like coherent optics and mmWave technologies.

Implementation Method 1

The use of a quantum dot (QD) coherent comb laser (CCL) that self-mode-locks, generating a stable optical frequency comb without external devices

Methodology Applied

Scientific EffectSelf-mode-locking:

Implementation Method 2

A quantum dot (QD) coherent comb laser (CCL)

Methodology Applied

Scientific EffectQuantum dot lasing:

Data Source

PatentUS11990944B1Communication networks including quantum dot coherent comb lasers, and associated methods

Publication Date: 2024.05.21 CABLE TELEVISION LAB INC

AI summary

A method for generating optical communication signals in a communication network includes (1) generating at least a first optical tone and a second optical tone using a quantum dot (QD) coherent comb laser (CCL), the first and second optical tones having different respective wavelengths, (2) modulating the first optical tone according to a first modulation signal to generate a first communication signal, and (3) modulating the second optical tone according to a second modulation signal to generate a second communication signal.