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Investigation of monolithic passively mode-locked quantum dot lasers with extremely low repetition frequency.

Xu T, Cao J, Montrosset I - Nanoscale Res Lett (2015)

Bottom Line: A modified multisection delayed differential equation model is proposed to accomplish simulations of both two-section and three-section passively mode-locked lasers with long cavity.According to the numerical simulations, it is shown that fundamental and harmonic mode-locking regimes can be multistable over a wide current range.In addition, we demonstrate that fundamental pulses with higher peak power can be achieved when the laser is designed to work in a region with smaller differential gain.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050 China.

ABSTRACT
The dynamical regimes and performance optimization of quantum dot monolithic passively mode-locked lasers with extremely low repetition rate are investigated using the numerical method. A modified multisection delayed differential equation model is proposed to accomplish simulations of both two-section and three-section passively mode-locked lasers with long cavity. According to the numerical simulations, it is shown that fundamental and harmonic mode-locking regimes can be multistable over a wide current range. These dynamic regimes are studied, and the reasons for their existence are explained. In addition, we demonstrate that fundamental pulses with higher peak power can be achieved when the laser is designed to work in a region with smaller differential gain.

No MeSH data available.


Related in: MedlinePlus

Bifurcation diagrams illustrating different operation regimes of the 2-cm-long two-section ML laser. (a) Peak power, (b) pulse width, and (c) average power at the fixed reverse-bias voltage V = −2 V and as a function of the injection current for this device are shown. The fundamental ML branch (red cross) and the second (black circle), the third (green cross), and the fourth (blue plus) harmonic ML branches are illustrated. Arrows in (a) identify the working point which will be discussed later in Figure 3.
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Fig2: Bifurcation diagrams illustrating different operation regimes of the 2-cm-long two-section ML laser. (a) Peak power, (b) pulse width, and (c) average power at the fixed reverse-bias voltage V = −2 V and as a function of the injection current for this device are shown. The fundamental ML branch (red cross) and the second (black circle), the third (green cross), and the fourth (blue plus) harmonic ML branches are illustrated. Arrows in (a) identify the working point which will be discussed later in Figure 3.

Mentions: In this subsection, we analyze the dynamic regimes for the previously described 2-cm-long two-section passively ML laser. In Figure 2, the bifurcation diagrams of the achieved peak power, pulse width, and average power are reported.Figure 2


Investigation of monolithic passively mode-locked quantum dot lasers with extremely low repetition frequency.

Xu T, Cao J, Montrosset I - Nanoscale Res Lett (2015)

Bifurcation diagrams illustrating different operation regimes of the 2-cm-long two-section ML laser. (a) Peak power, (b) pulse width, and (c) average power at the fixed reverse-bias voltage V = −2 V and as a function of the injection current for this device are shown. The fundamental ML branch (red cross) and the second (black circle), the third (green cross), and the fourth (blue plus) harmonic ML branches are illustrated. Arrows in (a) identify the working point which will be discussed later in Figure 3.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384970&req=5

Fig2: Bifurcation diagrams illustrating different operation regimes of the 2-cm-long two-section ML laser. (a) Peak power, (b) pulse width, and (c) average power at the fixed reverse-bias voltage V = −2 V and as a function of the injection current for this device are shown. The fundamental ML branch (red cross) and the second (black circle), the third (green cross), and the fourth (blue plus) harmonic ML branches are illustrated. Arrows in (a) identify the working point which will be discussed later in Figure 3.
Mentions: In this subsection, we analyze the dynamic regimes for the previously described 2-cm-long two-section passively ML laser. In Figure 2, the bifurcation diagrams of the achieved peak power, pulse width, and average power are reported.Figure 2

Bottom Line: A modified multisection delayed differential equation model is proposed to accomplish simulations of both two-section and three-section passively mode-locked lasers with long cavity.According to the numerical simulations, it is shown that fundamental and harmonic mode-locking regimes can be multistable over a wide current range.In addition, we demonstrate that fundamental pulses with higher peak power can be achieved when the laser is designed to work in a region with smaller differential gain.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050 China.

ABSTRACT
The dynamical regimes and performance optimization of quantum dot monolithic passively mode-locked lasers with extremely low repetition rate are investigated using the numerical method. A modified multisection delayed differential equation model is proposed to accomplish simulations of both two-section and three-section passively mode-locked lasers with long cavity. According to the numerical simulations, it is shown that fundamental and harmonic mode-locking regimes can be multistable over a wide current range. These dynamic regimes are studied, and the reasons for their existence are explained. In addition, we demonstrate that fundamental pulses with higher peak power can be achieved when the laser is designed to work in a region with smaller differential gain.

No MeSH data available.


Related in: MedlinePlus