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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

CN 10-1029/TN

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Front. Optoelectron.    2017, Vol. 10 Issue (2) : 180-188    https://doi.org/10.1007/s12200-017-0711-y
RESEARCH ARTICLE
Theoretical demonstration of all-optical switchable and tunable UWB doublet pulse train generator utilizing SOA wavelength conversion and tunable time delay
Zhefeng HU(), Jianhui XU, Min HOU
School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
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Abstract

An all-optical ultrawide band (UWB) doublet pulse train signal generator is proposed and theoretically simulated by utilizing an inverse wavelength conversion base on the cross-gain modulation (XGM) effect in a semiconductor optical amplifier (SOA) and controllable time delay in two optical delay lines (ODLs). The proposed scheme is not only optically switchable in the polarity of pulse by switching the polarity of input pulse but also tunable in signal pulse width and radiofrequency (RF) spectrum by tuning the ODLs.
Keywords microwave photonics      ultrawide band (UWB)      tunable      switchable      semiconductor optical amplifier (SOA)      tunable time delay     
Corresponding Author(s): Zhefeng HU   
Just Accepted Date: 26 April 2017   Online First Date: 22 June 2017    Issue Date: 05 July 2017
 Cite this article:   
Zhefeng HU,Jianhui XU,Min HOU. Theoretical demonstration of all-optical switchable and tunable UWB doublet pulse train generator utilizing SOA wavelength conversion and tunable time delay[J]. Front. Optoelectron., 2017, 10(2): 180-188.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-017-0711-y
https://academic.hep.com.cn/foe/EN/Y2017/V10/I2/180
Fig.1  Working principle of the proposed switchable and tunable UWB pulse train generation scheme. (a) UWB pulse train in a negative doublet shape; (b) UWB pulse train in a positive doublet shape
symboldescriptionvalue
lactive region length10−3 m
wactive region width1.5 × 10−6 m
dactive region thickness2 × 10−7 m
Acoefficient of unimolecular recombination1.5 × 108 s−1
Bcoefficient of bimolecular recombination1 × 10−16 m3/s
Ccoefficient of Auger recombination1.2 × 10−40 m6/s
a1gain coefficient 15 × 10−20 m2
a2gain coefficient 27.4 × 1018 m−3
a3gain coefficient 33.155 × 1025 m−4
a4gain coefficient 43 × 10−32 m4
N0transparency carrier density1 × 1024 m−3
l0transparency wavelength1.56 × 10−6 m
αlinewidth enhancement factor4
aintinternal loss5 × 103 m−1
Γconfinement factor0.3
Tab.1  Parameters of SOA used in simulation
Fig.2  Temporal trace of lights at different wavelengths when the input signal is a Gaussian pulse train. (a) Input signal; (b) output signal; (c) output probe at lp1; (d) output probe at lp2
Fig.3  Temporal trace of lights at different wavelengths when the input signal is a polarity-reversed Gaussian pulse train. (a) Input signal; (b) output signal; (c) output probe at lp1; (d) output probe at lp2
Fig.4  Waveforms of the obtained UWB signal in doublet shape with time delay introduced by ODL1 tuned at different values. (a)–(c) 40, 80, and 120 ps (UWB signals in negative doublet shape); (d)–(f) 40, 80, and 120 ps (UWB signals in positive doublet shape)
Fig.5  Pulse widths depending on time delay of ODL1. (a) UWB signals in negative doublet shape; (b) UWB signals in positive doublet shape
Fig.6  RF spectra of the generated signals and their envelopes in doublet shape with time delay introduced by ODL1 tuned at different values. (a)–(c) 40, 80, and 120 ps (UWB signals in negative doublet shape); (d)–(f) 40, 80, 120 ps (UWB signals in positive doublet shape) Fc: central frequency; BW10 dB: bandwidth at 10 dB
Fig.7  Central frequency, 10 dB bandwidth, and fractional bandwidth depending on the time delay of ODL1. (a) and (b) UWB signal in negative doublet shape; (c) and (d) UWB signal in positive doublet shape. (a) and (c) central frequency and 10 dB bandwidth; (b) and (d) fractional bandwidth
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