Theoretical study on chirp of wavelength conversion based on QD-SOA

CHEN Tingting; WANG Hailong; LIU Song; GONG Qian

doi:10.7510/jgjs.issn.1001-3806.2016.02.030

Chirp characteristics of signal light can largely affect the performance of quantum-dot semiconductor optical amplifiers (QD-SOA), cause the walk-off effect of transmitted signal and increase the bit error rate. To improve this situation, chirp characteristics of QD-SOA all-optical wavelength converters were analyzed. Based on all-optical wavelength conversion principle of QD-SOA's cross-gain modulation (XGM), using Newton's method and 4-order Runge-Kutta method, rate equations and light field transmission equation were solved, chirp values of converted light of a QD-SOA all-optical wavelength converter were calculated with the change of injection current, pumping light pulse width and extinction ratio of pumping light. The results show that increasing pulse width of pumping light, reducing injection current and extinction ratio of pumping light can reduce the chirp value of converted light. The impact of chirp can be reduced by optimizing these parameters. But during the design of QD-SOA all-optical wavelength converters, the balance between extinction ratio of pump light and chirp of conversion light should be considered.

Theoretical study on chirp of wavelength conversion based on QD-SOA

Corresponding author: WANG Hailong, hlwang@mail.qfnu.edu.cn;

1. College of Physics and Engineering, Qufu Normal University, Qufu 273165, China;

2. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

Received Date: 2014-12-16

Accepted Date: 2015-01-21

Available Online: 2016-03-25

Abstract: Chirp characteristics of signal light can largely affect the performance of quantum-dot semiconductor optical amplifiers (QD-SOA), cause the walk-off effect of transmitted signal and increase the bit error rate. To improve this situation, chirp characteristics of QD-SOA all-optical wavelength converters were analyzed. Based on all-optical wavelength conversion principle of QD-SOA's cross-gain modulation (XGM), using Newton's method and 4-order Runge-Kutta method, rate equations and light field transmission equation were solved, chirp values of converted light of a QD-SOA all-optical wavelength converter were calculated with the change of injection current, pumping light pulse width and extinction ratio of pumping light. The results show that increasing pulse width of pumping light, reducing injection current and extinction ratio of pumping light can reduce the chirp value of converted light. The impact of chirp can be reduced by optimizing these parameters. But during the design of QD-SOA all-optical wavelength converters, the balance between extinction ratio of pump light and chirp of conversion light should be considered.

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Reference (19)

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Theoretical study on chirp of wavelength conversion based on QD-SOA

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