OFDM signal up and down frequency conversions by a sampling method using a SOA-MZI

Termos, Hassan; Rampone, Thierry; Sharaiha, Ammar; Hamié, Ali; Alaeddine, Ali

doi:10.1109/icm.2017.8268822

Cited by 12 publications

(36 citation statements)

References 12 publications

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“…For switching, a differentially‐driven SOA‐MZI provides superior performances compared to single‐ended operation [7]. SOA‐MZI has been used as a sampling mixer in a previous work to perform up and down frequency conversions both in single‐ended and differential configurations [8–10]. In this Letter, we show that increasing the sampling frequency improves the efficiency and the quality of the optical transmission of QPSK and OFDM signals.…”

Section: Introductionmentioning

confidence: 84%

Sampling rate influence in up and down mixing of QPSK and OFDM signals using an SOA‐MZI in a differential configuration

2018

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Up and down frequency conversions in the range of 0.5-39.5 GHz are performed by using a Semiconductor Optical Amplifier-Mach-Zehnder interferometer (SOA-MZI) in a differential configuration as a sampling mixer. The authors show that increasing the sampling frequency by a ratio of 2.5 (from 7.8 to 19.5 GHz) improves the efficiency and the quality of the optical transmission of QPSK and OFDM signals due to a better signal level and a lower aliased noise power when the sampling rate is higher. At the high sampling rate, the obtained EVM is sufficiently low for allowing data bit rates higher than 1 Gbit/s and 245 Mbit/s, respectively, for QPSK and OFDM modulated data.

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Section: Introductionmentioning

confidence: 84%

Sampling rate influence in up and down mixing of QPSK and OFDM signals using an SOA‐MZI in a differential configuration

2018

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“…The conversion gain achieved in this range of frequencies was reduced from 15.5 to −13.4 dB. During our previous work in [22][23][24][25], the maximum frequency range that corresponded to the highest mixing frequency of the up-converted signals was obtained up to 39.5 GHz. In other studies, the maximum frequency range was observed up to 60 GHz without the use of the sampling technique.…”

Section: Introductionmentioning

confidence: 75%

“…The XPM effect is exploited within a SOA-MZI (SOA Mach-Zehnder interferometer) for up-conversion [17,18], and up and down conversions for full-duplex applications [19]. Sampling techniques [20,21] based on a sampling signal driven by an optical pulse source can be used in electronic or optical digital systems for frequency mixing [22][23][24][25]. Furthermore, several techniques are used to implement a RoF system for increasing the channel capacity of a single-mode fiber (SMF) [8,26,27].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Up-Conversion Based on a Co- & Counter-Directions SOA-MZI Sampling Mixer with Standard & Differential Modulation Modes

2022

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Simulation and experimental performance analyses of simultaneous up-converted signals, for the first time, were investigated utilizing a semiconductor optical amplifier Mach–Zehnder interferometer (SOA-MZI) sampling mixer in co- and counter-directions for standard and differential modulation modes. An optical pulse source at a sampling frequency of fs = 15.6 GHz was used as a sampling signal. The IF signal channels carrying quadrature phase shift keying (QPSK) data at frequencies fm were up-converted at different mixing frequencies up to 195.5 GHz. Using the Virtual Photonics Inc. (VPI) simulator, we realized mixed QPSK signals and studied their characteristics through a conversion gain and an error vector magnitude (EVM). Simulations of up mixing operated in a frequency range up to 158 GHz. For the standard modulation in the co-direction, the conversion gain decreased from 43.3 dB at the mixing frequency of 16.6 GHz to 21.8 dB at 157 GHz for the first channel and from 43 dB at 17.6 GHz to 21 dB at 158 GHz for the second channel. The use of the differential modulation principle improved the conversion gain by about 10 dB at 195.5 GHz compared to standard modulations in co- and counter-directions. The EVM reached, respectively, 15.5 and 17.5% for the differential modulation in both configurations, at the bit rate of 100 Gbit/s at 195.5 GHz. The benefit provided by the differential modulation was that EVM values were shifted by 20% for all channels in both configurations at 100 Gbit/s. In the real measurement, we confirmed that co-directional conversion exhibited a better performance than the counter-directional operation. In addition, the real mixed signal exhibited lower efficiency and quality in comparison with simulated signals due to the sensitivity of the receiver.

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“…Semiconductor optical amplifiers (SOAs) rely on their nonlinearity such as cross-gain modulation (XGM) [10] and XPM [11][12][13][14][15][16][17][18][19][20] can also be used for shifting at the same time in the layout of a detached apparatus or implemented in an interferometric structure such as an SOA-Mach-Zehnder Interferometer (SOA-MZI). SOA-MZIs can achieve good performance, such as a frequency range up to 100 GHz [19].…”

Section: Introductionmentioning

confidence: 99%

“…SOA-MZIs can achieve good performance, such as a frequency range up to 100 GHz [19]. All-optical mixing based on a sampling SOA-MZI [11][12][13][14][15][16][17] has achieved excellent characteristics such as high positive conversion gain for both experimental and simulation studies. The used SOA-MZI combined with an optical pulse source that uses a mode-locked laser in order to generate an optical pulse train can be used up and down conversion simultaneously with good efficiency.…”

Section: Introductionmentioning

confidence: 99%

Frequency Alteration Built on an Electro-Optical Sampling SOA–MZI Using a Differential Modulation Schema

Termos

Mansour

2022

Optics

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In this paper, we present a real and simulated study of a frequency up mixing employing an electro-optical sampling semiconductor optical amplifier Mach–Zehnder interferometer (SOA–MZI) along with the differential modulation schema. The sampling signal is generated by an optical pulse clock (OPC) at a frequency of fs= 19.5 GHz. The quadratic phase shift keying (QPSK) signal at an intermediate frequency (IF) fIF is shifted to high frequencies nfs ± fIF at the SOA–MZI output. Using a simulator entitled Virtual Photonics Inc. (VPI), we generate sampled QPSK signals and analyze their merits during conversion gains and error vector magnitudes (EVMs). We conducted simulations of mixing in the SOA–MZI operating in a high-frequency band up to 195.5 GHz. The positive conversion gain is accomplished over the mixing frequencies. The EVM is used to evaluate the performance of the electro-optical sampling up-convertor. The EVM reaches 14% at a data rate of 5 Gbit/s at 195.5 GHz. During the experimental work, the results obtained in simulations are set side by side with the factual ones in the frequency range up to 59 GHz. Thus, the comparison between them confirms that they have approximately the same performance.

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OFDM signal up and down frequency conversions by a sampling method using a SOA-MZI

Cited by 12 publications

References 12 publications

Sampling rate influence in up and down mixing of QPSK and OFDM signals using an SOA‐MZI in a differential configuration

Sampling rate influence in up and down mixing of QPSK and OFDM signals using an SOA‐MZI in a differential configuration

Simultaneous Up-Conversion Based on a Co- & Counter-Directions SOA-MZI Sampling Mixer with Standard & Differential Modulation Modes

Frequency Alteration Built on an Electro-Optical Sampling SOA–MZI Using a Differential Modulation Schema

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