Design of an ultrafast all-optical NOR logic gate based on Mach-Zehnder interferometer using quantum-dot SOA

Nurmohammadi, Tofiq; Abbasian, K.; Asadi, Mohammad Javad; Jafari, D.

doi:10.1016/j.ijleo.2014.01.119

Cited by 13 publications

(6 citation statements)

References 25 publications

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“…Today's optical technologies developed in many aspects and branches [1][2][3][4][5][6]. The rapid growth of the internet, increasing data traffic and all-optical processing and storages in the modern societies force the communication networks to increase the bandwidth and capacity [7][8][9]. Hence, it is preferred to use optical communication networks that work based on optical packet switching (OPS) instead of current optical packet circuits (OPC) networks [10,11].…”

Section: Introductionmentioning

confidence: 99%

A novel variable-length header extraction scheme based on ring laser for all-optical packet switching network

et al. 2021

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In this paper, a novel header extraction scheme based on semiconductor ring laser is proposed and simulated for proof of principle. This scheme is to be used in all-optical packet switching network which can extract return-to-zero (RZ) format modulation data packet with variable header/payload length and intensive spacing. Simulations and numerical analysis for a 3-byte header and 128-byte payload show that this structure can extract the headers with more than 20 dB contrast ratio. Additionally, the structure simplicity and its small size is proper candida to integration in alloptical circuits.

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Section: Introductionmentioning

confidence: 99%

A novel variable-length header extraction scheme based on ring laser for all-optical packet switching network

et al. 2021

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“…XGM speed increases with the decrease in the gain recovery time. Achieving ultra-fast gain recovery in QDSOA was reported in the literature using several methods [21,22]. In these theoretical works, a control pulse in different wavelengths of the pump pulse was used to increase the accumulation rate in excited state (ES).…”

Section: Introductionmentioning

confidence: 99%

Quantum dot semiconductor optical amplifier: investigation of ultra-fast cross gain modulation in the presence of a second excited state

Izadyar¹,

Razaghi²,

Hassanzadeh³

2020

J. Phys. D: Appl. Phys.

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In this paper, a theoretical model is proposed to investigate and analyze an ultra-fast cross gain modulation (XGM) in quantum dot semiconductor optical amplifiers (QDSOAs). The proposed model is based on a set of carrier’s rate equations, propagation equations for pump and probe signals and phase equations. To investigate the XGM mechanism, nonreturn-to-zero (NRZ) pulse trains with various bitrates are supposed to propagate as the input pump signals through the QDSOA’s active layer. The probe signal is assumed to be a continuous wave (CW) signal. Furthermore, optical gain of quantum dots (QDs) is calculated using a density matrix approach. For the first time, to the best of our knowledge, a second excited state is considered in the band diagram of QDs, to obtain the ultra-fast XGM in QDSOAs. Therefore, in the presented model, the rate equations are written for the carriers in the ground state, first and second excited states (ES2), continuum state and the wetting layer. In the presence of ES2, gain recovery time and gain saturation is reduced and, therefore, ultra-high bitrate pulse trains can be modulated with negligible pattern effects and wave distortion. The effect of the injection current density increment and carrier’s relaxation lifetime decrement are illustrated to show the improvement in the XGM mechanism in the QDSOA. It is shown theoretically that ultra-high bitrate XGM up to 450 Gbps is possible due to the reduced gain recovery time in the presence of ES2. It is demonstrated that at the same pump power for higher injection current densities and lower carrier relaxation lifetimes, the pattern effect and wave distortion has almost vanished. Although, in this case, the extinction ratio (ER) is decreased. It is shown that to recover the ER, the input pump power should be increased. Furthermore, based on the results in the presence of ES2, the ER is decreased by 0.5 dB.

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“…Since the first pioneering works predicted most desirable electronic and dynamic properties for quantum dots (QDs), 1,2 they have been in the focus of research for use in semiconductor optical amplifiers (SOAs). Ultrafast gain recovery and pronounced nonlinear effects 3 substantiate the high potential of QD-SOAs in the fields of high frequency signal amplification, all-optical data processing and wavelength conversion using four-wave-mixing (FWM) [4][5][6][7] . Devices with modulation frequencies exceeding 200 GHz 8 and a 120 nm broadband gain with saturation output powers above 20 dB facilitate wavelength division multiplexing 9,10 and high efficiency symmetric FWM.…”

Section: Introductionmentioning

confidence: 99%

Twofold gain enhancement by elongation of QDs in polarization preserving QD-SOAs

Greif¹,

Mittelstädt²,

Jagsch³

et al. 2019

Semicond. Sci. Technol.

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The impact of quantum dot (QD) elongation on key parameters of QD-based semiconductor optical amplifiers (SOAs) is investigated using a combination of 8-band k•p -theory including strain and piezoelectricity up to second order and a rate equation model describing the population of QD ground, excited and wetting layer states. By considering columnar QDs of selected aspect ratios, we show that chip gain and saturation gain can be enhanced by up to +3.6 dB via an increased elongation of the individual QDs while retaining polarization preserving amplification and gain recovery times below 700 fs. Our results enable the optimization of polarization preserving QD-SOA devices which combine ultrafast gain recovery with high gain and low power consumption.

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Design of an ultrafast all-optical NOR logic gate based on Mach-Zehnder interferometer using quantum-dot SOA

Cited by 13 publications

References 25 publications

A novel variable-length header extraction scheme based on ring laser for all-optical packet switching network

A novel variable-length header extraction scheme based on ring laser for all-optical packet switching network

Quantum dot semiconductor optical amplifier: investigation of ultra-fast cross gain modulation in the presence of a second excited state

Twofold gain enhancement by elongation of QDs in polarization preserving QD-SOAs

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