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Updated: Mar 18, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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Modeling and analysis of distributed feedback quantum dot passively mode-locked lasers.

Javad Rahimi, Vahid Ahmadi, Mohammad Hasan Yavari

|July 14, 2016

Summary

This study numerically compares two quantum dot lasers for high-speed applications. Distributed feedback quantum dot lasers offer higher peak power, while grating-embedded structures provide shorter pulses.

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Area of Science:

Optics and Photonics
Semiconductor Lasers
Quantum Dot Devices

Background:

Quantum dot passively mode-locked lasers (QDMLLs) are crucial for ultrahigh-bit-rate and single-mode applications.
Enhancing the performance of QDMLLs is essential for advancing optical communication technologies.

Purpose of the Study:

To numerically investigate two monolithic distributed feedback quantum dot passively mode-locked lasers (DFB-QDMLLs).
To compare DFB-QDMLLs with and without gratings in the saturable absorber (SA) section for enhanced performance.
To analyze temporal and spectral behaviors for optimizing ultrahigh-bit-rate and single-mode applications.

Main Methods:

Numerical investigation of two proposed DFB-QDMLL structures.
Comparison of laser performance based on grating length in the saturable absorber section.
Analysis of temporal and spectral characteristics under specified bias conditions and SA lengths.

Main Results:

Both structures can generate optical pulses with durations of 3-8 ps at 2nd and 4th harmonics of cavity round-trip frequencies.
DFB-QDMLLs produce higher peak power optical pulses compared to grating-embedded saturable absorber (GESA-DFB-QDMLL) structures.
GESA-DFB-QDMLLs yield shorter pulses with narrower spectral bandwidths.
DFB-QDMLLs exhibit a wider operating range of absorber voltages than the sensitive GESA-DFB-QDMLL structure.

Conclusions:

The choice between DFB-QDMLLs and GESA-DFB-QDMLLs depends on specific application requirements for pulse duration, peak power, and operating voltage range.
DFB-QDMLLs are suitable for applications prioritizing peak power and wider operational stability.
GESA-DFB-QDMLLs are advantageous for applications requiring shorter pulses and narrower spectral bandwidths.