Numerical simulations on narrow-linewidth photonic microwave generation based on a QD laser simultaneously subject to optical injection and optical feedback

Zaifu Jiang; Zaifu Jiang; Zhengmao Wu; Wenyan Yang; Wenyan Yang; Chunxia Hu; Chunxia Hu; Xiaodong Lin; Yanhong Jin; Ming Dai; Bin Cui; Dianzuo Yue; Guangqiong Xia

doi:10.1364/AO.388489

Applied Optics
Vol. 59,
Issue 9,
pp. 2935-2941
(2020)
•https://doi.org/10.1364/AO.388489

Numerical simulations on narrow-linewidth photonic microwave generation based on a QD laser simultaneously subject to optical injection and optical feedback

Zaifu Jiang, Zhengmao Wu, Wenyan Yang, Chunxia Hu, Xiaodong Lin, Yanhong Jin, Ming Dai, Bin Cui, Dianzuo Yue, and Guangqiong Xia

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Zaifu Jiang, Zhengmao Wu, Wenyan Yang, Chunxia Hu, Xiaodong Lin, Yanhong Jin, Ming Dai, Bin Cui, Dianzuo Yue, and Guangqiong Xia, "Numerical simulations on narrow-linewidth photonic microwave generation based on a QD laser simultaneously subject to optical injection and optical feedback," Appl. Opt. 59, 2935-2941 (2020)

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Table of Contents Category
- Lasers, Optical Amplifiers, and Laser Optics
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About this Article
History
- Original Manuscript: January 20, 2020
- Revised Manuscript: February 12, 2020
- Manuscript Accepted: February 15, 2020
- Published: March 20, 2020

Abstract

Based on a three-level model for quantum dot (QD) lasers, the characteristics of the photonic microwave generated by a QD laser simultaneously subject to optical injection and optical feedback are numerically investigated. First, the performance of the microwave signal generated by an optical injected QD laser operating at period one state are analyzed, and the mappings of the frequency and intensity of the generated microwave in the parameter space of the frequency detuning and injection strength are given, which are roughly similar to those reported experimentally. Next, an optical feedback loop is further introduced to the optically injected QD laser for compressing the linewidth of the microwave signal, and the results demonstrate that the linewidth of the generated microwave can be reduced by at least 1 order of magnitude under suitable feedback parameters. Finally, the effect of the linewidth enhancement factor on the generated microwave signal is analyzed.

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Symbol	Parameter	Value
$τ_{E S}^{R S}$	Capture time from RS to ES	6.3 ps
$τ_{G S}^{E S}$	Relaxation time from ES to GS	2.9 ps
$τ_{R S}^{E S}$	Escape time from ES to RS	2.7 ns
$τ_{E S}^{G S}$	Escape time from GS to ES	10.4 ps
$τ_{R S}^{s p}$	RS spontaneous decay time	0.5 ns
$τ_{E S}^{s p}$	ES spontaneous decay time	0.5 ns
$τ_{G S}^{s p}$	GS spontaneous decay time	1.2 ns
$τ_{p}$	Lifetime of photon	4.1 ps
$L$	Cavity length of QD laser	$5 \times 10^{- 2} c m$
$a_{G S}$	Differential gain of GS	$5 \times 10^{- 15} {c m}^{2}$
$a_{E S}$	Differential gain of ES	$10 \times 10^{- 15} {c m}^{2}$
$ξ$	Gain confinement factor	$2 \times 10^{- 16}$ ${c m}^{2}$
$Γ_{p}$	Optical confinement factor	0.06
$N_{B}$	Total number of QDs	$1 \times 10^{7}$
$α$	LEF	1
$v_{g}$	Group velocity of photonic	$8.57 \times 10^{7} m / s$
$V_{B}$	Volume of QDs	$5 \times 10^{- 11} {c m}^{3}$
$η$	Current injection efficiency	0.12
$β$	Spontaneous emission coefficient	$10^{- 4}$

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Applied Optics