FSK signal generation with wavelength reuse capability in 8 Gbit/s radio over fiber systems

doi:10.1007/s12200-013-0331-0

Front Optoelec

2013, Vol. 6

Issue (3) : 303-311 https://doi.org/10.1007/s12200-013-0331-0

RESEARCH ARTICLE

FSK signal generation with wavelength reuse capability in 8 Gbit/s radio over fiber systems

Lubna NADEEM, Rameez ASIF(

)

Telecommunication Engineering Department (TED), University of Engineering and Technology (UET), Taxila 47050, Pakistan

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Abstract

In this paper, a technique was numerically implemented to generate a frequency shift keying (FSK) radio-over-fiber (RoF) signal in optical domain. Due to the oscillator free generation of FSK signal, this scheme is highly stable with reduced complexity and extremely cost effective. The remote heterodyne detection method was used to detect the signal, where beating occurs to detect the FSK signal. With this scheme, it is able to efficiently generate FSK signal in the range of 60 and 75 GHz at 8 Gbit/s and effectively transmit it over 80 km link without degrading the signal shape and quality. The nonlinear threshold (NLT) point of the system has also been numerically analyzed to estimate the nonlinear tolerance of the system. Besides, the impact of transmission distance and polarization mode dispersion (PMD) was evaluated. Furthermore, the wavelength reuse for the uplink was implemented in the scheme by reusing the same wavelength for uplink that was used for signal generation at downlink. The whole process was performed in optical domain. Thus this scheme is very cost effective as the overall architecture of RoF system is simplified.

Keywords frequency shift keying (FSK) wavelength reuse transmission parameters photonic generation

Corresponding Author(s): ASIF Rameez,Email:rameez.asif@uettaxila.edu.pk

Issue Date: 05 September 2013

Cite this article:

Lubna NADEEM,Rameez ASIF. FSK signal generation with wavelength reuse capability in 8 Gbit/s radio over fiber systems[J]. Front Optoelec, 2013, 6(3): 303-311.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-013-0331-0
https://academic.hep.com.cn/foe/EN/Y2013/V6/I3/303

Fig.1 Block diagram showing proposed solution. RF: radioβfrequency; CW: continuous wave; MZM: Mach Zehnder modulator; SMF: single mode fiber

Fig.2 Modulation of CW laser with RF signal using MZM

Fig.3 Block diagram explaining signal generation by optical heterodyning. EA: electronic amplifier, SMF: single mode fiber, MZM: Mach-Zehnder modulator

Fig.4 Uplink path of proposed scheme

Fig.5 Original input signal

Fig.6 Inverted of input signal

Fig.7 Spectrum output of photo-detector at downlink

Fig.8 Generated FSK signal at photo-detector

Fig.9 Eye diagram

Fig.10 Demodulated output

Fig.11 Change in BER by varying input power

Fig.12 Change in BER by varying transmission distance

Fig.13 Change in BER by varying PMD

Fig.14 Change in BER by varying input power at different bitrates

Fig.15 Input signal for uplink

Fig.16 Output signal after demodulation

Fig.17 Spectrum at output showing peak at 60 GHz

Fig.18 Eye diagram for uplink output signal

Fig.19 Trend in bit error rate by varying input power at 25 km

Fig.20 Trend in bit error rate by changing transmission distance

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[2]	Liu YANG,Fengguang LUO. Novel frequency shift keying modulation based on fiber Bragg gratings and intensity modulators[J]. Front. Optoelectron., 2016, 9(4): 616-620.

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