Generation and transmission analysis of 4-ary frequency shift keying based on dual-parallel Mach-Zehnder modulator

doi:10.1007/s12200-016-0637-9

Front. Optoelectron.

2017, Vol. 10

Issue (2) : 160-165 https://doi.org/10.1007/s12200-016-0637-9

RESEARCH ARTICLE

Generation and transmission analysis of 4-ary frequency shift keying based on dual-parallel Mach-Zehnder modulator

Liu YANG, Fengguang LUO(

)

National Engineering Laboratory for Next Generation Internet Access System, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

We proposed an optical 4-ary frequency shift keying (FSK) modulation scheme applying dual-parallel Mach-Zehnder (MZ) modulator. The 4-ary FSK based on the single-side-band modulation scheme can greatly lower the transmission speed in each sub-carriers and increase the transmission performance, comparing with the 2-FSK signal. The transmission performance of the 4-ary FSK was demonstrated after a 50 km single mode fiber. The results showed that the 4-ary FSK can realize error-free transmission. Moreover, we analyzed the influence of factors (such as disperse compensation and demodulation bandwidth) on the transmission performance in this paper. The analysis of the influenced factors can provide a theoretical basic for experiment.

Keywords 4-ary frequency shift keying (FSK) modulation scheme disperse compensation

Corresponding Author(s): Fengguang LUO

Just Accepted Date: 30 September 2016 Online First Date: 27 October 2016 Issue Date: 05 July 2017

Cite this article:

Liu YANG,Fengguang LUO. Generation and transmission analysis of 4-ary frequency shift keying based on dual-parallel Mach-Zehnder modulator[J]. Front. Optoelectron., 2017, 10(2): 160-165.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-016-0637-9
https://academic.hep.com.cn/foe/EN/Y2017/V10/I2/160

Fig.1 Structure of dual-parallel FSK modulation and the scheme of 4-ary FSK modulation

Fig.2 Structure of 4-ary FSK transmission. PRBS: pseudo random binary sequence, RF: radio frequency, EDFA: Erbium doped fiber amplifier, SSMF: standard single mode fiber, DCF: dispersion compensation fiber, PD: photodiode, BERT: bit error rate tester

Fig.3 Spectrums of A-E points in Fig. 2

Fig.4 Transmission performance of 4-ary FSK signal after 50 km SSMF and 10 km DCF. The dispersion slop of DCF is (a) -0.375 ps/nm²/km and (b) 0.26 ps/nm²/km

Fig.5 Transmission performances of 4-ary FSK signal under different (a) dispersion slop compensations and (b) different dispersion compensations

Fig.6 Transmission performance of 4-ary FSK signal under different modulation and demodulation bandwidths

Fig.7 BER performance versus received power

Fig.8 Received power versus the deviation of central frequency

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