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Updated: Jul 21, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Broadband quantum-dot frequency-modulated comb laser.

Bozhang Dong¹, Mario Dumont², Osama Terra^3,4

¹Institute for Energy Efficiency, University of California, Santa Barbara, CA, USA. bdong@ucsb.edu.

Light, Science & Applications

|July 25, 2023

Summary

This summary is machine-generated.

Quantum-dot lasers can now generate both amplitude-modulated (AM) and frequency-modulated (FM) laser combs independently. This breakthrough offers a wider bandwidth for applications in silicon photonics.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

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Area of Science:

Optoelectronics and Photonics
Quantum Dot Lasers
Integrated Photonics

Background:

Frequency-modulated (FM) laser combs are crucial for applications like wavelength-division multiplexing and precision metrology.
Existing FM comb generation methods, often in quantum cascade lasers, require low-dispersion cavities, posing challenges for material-dominated dispersion platforms.
Quantum cascade Fabry-Perot (FP) lasers have been widely used for FM comb generation, but cavity design is critical.

Purpose of the Study:

To report a novel quantum-dot (QD) mode-locked laser capable of independently generating both amplitude-modulated (AM) and frequency-modulated (FM) combs.
To demonstrate efficient FM comb generation in a QD laser platform by leveraging high four-wave mixing (FWM) efficiency.
To explore practical engineering of Kerr nonlinearity for enhanced FM comb bandwidth without relying on group velocity dispersion (GVD) engineering.

Main Methods:

Development of a 60 GHz quantum-dot mode-locked laser.
Characterization of AM and FM comb generation capabilities.
Measurement of FWM efficiency and analysis of Kerr nonlinearity effects on comb bandwidth.

Main Results:

Independent generation of both AM and FM combs was achieved in the QD laser.
High FWM efficiency (-5 dB) facilitated efficient FM comb generation.
Engineered Kerr nonlinearity broadened the FM comb bandwidth to a maximum of 2.2 THz (3-dB) without GVD engineering.

Conclusions:

The quantum-dot laser platform offers a versatile solution for generating both AM and FM combs.
This approach overcomes limitations of previous methods by enabling FM comb generation without strict GVD engineering.
The study paves the way for compact, electrically pumped, and energy-efficient frequency combs for silicon photonic integrated circuits.