Investigation of a cross‐gain modulation in a semiconductor optical amplifier based on a quantum dot‐in‐a‐well structure

Ezra, Yosef Ben; Lembrikov, B. I.

doi:10.1049/iet-opt.2014.0061

Cited by 4 publications

(19 citation statements)

References 34 publications

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“…We investigated theoretically the optical synchronization of the carrier dynamics in the optically injected QDWELL laser and SOA and its influence on the QDWELL laser and SOA performance [23][24][25][26][27]. We solved numerically the LS equations (14)- (17) for the optically injected QDWELL laser [24][25][26] and Eqs.…”

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

“…We solved numerically the LS equations (14)- (17) for the optically injected QDWELL laser [24][25][26] and Eqs. (17)- (22) for the QDWELL SOA [23,27] [17,20]. We used the MATLAB environment for the numerical simulations.…”

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

“…Consider now the influence of the optical pumping on the QDWELL SOA performance [23,27]. We investigated the copropagating pumping and signal optical waves characterized by the optical power P p, s and the wavelengths λ p, s , respectively [23].…”

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

“…It is shown in Figure 12 that due to the carrier dynamics synchronization provides the XGM process without the pattern effect, and the chirp reduces to about 5GHz and becomes symmetric [23,27]. The strong optical pumping wave of several milliwatts during the XGM process may enhance the QDWELL SOA bandwidth up to 100 nm for a central wavelength of 1350 nm [27]. We investigated the ER dependence on the XGM detuning for the signal wave wavelength Figure 11.…”

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

“…The output signal eye diagram for the signal power of 1 mW, optical pumping power of 2 mW, the bias current density of 2j th , and modulation bit rate of 140 GB/s. Optical Communication Technologyλ s ¼ 1:35μm and optical power P s ¼ 1 mW, and the CW pumping wave power P p of 0.1 and 0.01 mW [27]. The simulation results are shown in Figure 13.…”

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

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Improvement of the Quantum Dot-in-a-Well (QDWELL) Laser and Amplifier Performance under the Optical Injection

Ezra¹,

Lembrikov²

2017

Optical Communication Technology

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Quantum dot (QD) laser devices can be successfully used in optical communications due to their unique properties caused by the carrier localization in three dimensions. In particular, quantum dot-in-a-well (QDWELL) lasers are characterized by an extremely low threshold current density and the high modulation frequency. However, their operation rate is limited by the strongly nonlinear electron and hole scattering rates in and out of QD. We investigated theoretically the nonlinear optical phenomena in QDWELL lasers and amplifiers under the optical injection. We have shown that the synchronization of the carrier dynamics in QD and quantum well (QW) caused by the optical injection improves the QDWELL laser performance and, in particular, enhances the relaxation oscillation (RO) frequency. As a result, the QDWELL laser performance in the analogous optical link (AOL) is significantly improving. The optical injection also improves the performance of the QDWELL-based semiconductor optical amplifiers (SOA).

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Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

Section: Optical Synchronization Of a Qdwell Laser Dynamics And Its Imentioning

confidence: 99%

See 3 more Smart Citations

Improvement of the Quantum Dot-in-a-Well (QDWELL) Laser and Amplifier Performance under the Optical Injection

Ezra¹,

Lembrikov²

2017

Optical Communication Technology

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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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Simulation research of location mechanism of chaotic distributed optical fiber sensing system

et al. 2017

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Investigation of a cross‐gain modulation in a semiconductor optical amplifier based on a quantum dot‐in‐a‐well structure

Cited by 4 publications

References 34 publications

Improvement of the Quantum Dot-in-a-Well (QDWELL) Laser and Amplifier Performance under the Optical Injection

Improvement of the Quantum Dot-in-a-Well (QDWELL) Laser and Amplifier Performance under the Optical Injection

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

Simulation research of location mechanism of chaotic distributed optical fiber sensing system

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