Broadband Chaos Signal Generation Based on Dual-mode DFB Laser with Optical Feedback

Yiteng Zhang; Zhiwei Jia; Qingtian Li; Longsheng Wang; Anbang Wang

doi:10.3788/AOS202141.2114001

Acta Optica Sinica, Volume. 41, Issue 21, 2114001(2021)

Broadband Chaos Signal Generation Based on Dual-mode DFB Laser with Optical Feedback

Yiteng Zhang^1,2, Zhiwei Jia^1,2, Qingtian Li^1,2, Longsheng Wang^1,2, and Anbang Wang^1,2、*

¹Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China

²College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China

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Figures & Tables(9)

Fig. 1. Static characteristics of DM－DFB laser at I＝8I_th. (a) Optical spectrum；(b) power spectrum; (c) time series

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Fig. 2. Typical chaotic states of optical feedback DM－DFB laser at I＝8I_th

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Fig. 3. Effects of mode interval on chaotic bandwidth when κ_f＝0.8

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Fig. 4. Effect of feedback coefficients on chaotic bandwidth. (a) Effect of Δυ on chaotic bandwidth when I＝8I_th;(b) effect of bias current I on chaotic bandwidth when Δυ＝35 GHz

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Fig. 5. Setup diagram of chaotic signal generation using DM－DFB laser optical feedback

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Fig. 6. VPI simulation results of optical feedback DM－DFB laser at I＝8I_th

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Fig. 7. The influence of external parameters on the bandwidth of chaotic signals. (a) Distribution of chaotic bandwidth as function of bias current and feedback intensity; (b) effects of feedback delay time on chaotic bandwidth when I＝8I_th and κ＝－3 dB

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Table 1. Simulation parameters of the DM－DFB laser with optical feedback

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Table 1. Simulation parameters of the DM－DFB laser with optical feedback

Description	Symbol	Value
Linewidth enhancement factor	α	5
Differential gain coefficient /s^－1	g	3.2×10³
Transparency carrier number	N₀	1.25×10⁸
Gain saturation coefficient	ε	1×10^－23
Optical angular frequency interval /GHz	Δω_L	2π×35
Gain peak frequency /THz	Δω_c	2π×193.5
Gain width /THz	Δω_g	2π×10
Photon lifetime /ps	τ_P	4.2
Feedback delay time /ns	τ_f	5
Spontaneous emission factor	β	0.001
Facet amplitude reflectivity	r₀	0.548
Internal round－trip time /ps	τ_L	28.57
Carrier lifetime /ns	τ_N	1.6
Elementary charge /C	q	1.602×10^－19

Table 2. Parameters for DM－DFB laser used in VPI software

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Table 2. Parameters for DM－DFB laser used in VPI software

Description	Symbol	Value
Active section length /μm	L	900
Active section width /μm	W	2.5
Group velocity index	n_g	3.8
Index grating coupling coefficient /cm^－1	κ_i	5
Defect recombination coefficient /s^－1	A	3×10⁸
Radiation recombination coefficient /(m³·s^－1)	B	1×10^－16
Auger recombination coefficient /(m⁶·s^－1)	C	1.3×10^－41
Internal loss factor /cm^－1	a	10
Linewidth enhancement factor	α	6
Transparency carrier density /m^－3	N₀	1.5×10²⁴
Linear material gain coefficient /m²	G	3×10^－20
Reflectivity of facets	R	0.32

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Yiteng Zhang, Zhiwei Jia, Qingtian Li, Longsheng Wang, Anbang Wang. Broadband Chaos Signal Generation Based on Dual-mode DFB Laser with Optical Feedback[J]. Acta Optica Sinica, 2021, 41(21): 2114001

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Paper Information

Category: Lasers and Laser Optics

Received: Apr. 25, 2021

Accepted: May. 18, 2021

Published Online: Oct. 29, 2021

The Author Email: Anbang Wang (wanganbang@tyut.edu.cn)

DOI:10.3788/AOS202141.2114001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology