Narottam Kumar Das

Central Queensland University

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Yasuhiro Yamayoshi

Yamagata University

Hitoshi Kawaguchi

Nara Institute of Science and Technology

Mohammad Razaghi

University of Kurdistan

Nemai Chandra Karmakar

Monash University

Seyed Rasoul Hosseini

Amirkabir University of Technology

Tadashi Kawazoe

Nichia Corporation (Japan)

Vahid Ahmadi

Tarbiat Modares University

Aram Fardi

University of Kurdistan

Hamed Baghban

University of Tabriz

Syed Islam

Hammersmith Hospital

Cooperative Institutions

University of Kurdistan

Japan Science and Technology Agency

Tarbiat Modares University

Nanophoton (Brazil)

Ilam University

Amirkabir University of Technology

Yamagata University

Yamagata University Hospital

Yamaguchi University

University of Guilan

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Numerical Analysis of All-Optical Demultiplexing Characteristics in Semiconductor Optical Amplifiers Based on Four-Wave Mixing

Conference on Optoelectronic and Microelectronic Materials and Devices (2006)

Narottam Kumar Das Yasuhiro Yamayoshi Hitoshi Kawaguchi

Numerically, we have analyzed the basic characteristics of all-optical demultiplexing based on four-wave mixing in semiconductor optical amplifiers by solving a modified nonlinear Schrodinger equation using the finite-difference beam propagation method. For high on-off ratio, the optimum input pump pulsewidth is 1~3 ps for 1 ps, 250 Gbit/s probe pulse. From the simulation results, it is clear that for the faster demultiplexing operation, semiconductor optical amplifiers with wider gain bandwidth are required. We have simulated pattern effects in the FWM signal. We have also obtained demultiplexing from the time-multiplexed signals by repetitive pump pulses

Four-wave mixing

10.1109/commad.2004.1577487

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Citations (4)

Pattern effect reduction scheme for high-speed all-optical amplification system

Optical Engineering (2014)

Mohammad Razaghi Omid Jafari Narottam Kumar Das

A method for high-bit-rate optical pulse amplification without a pattern effect (PE) phenomenon is numerically analyzed and presented. In the proposed new scheme, the input signals are applied to a series of 1×2 optical switches and semiconductor optical amplifiers (SOAs). Based on the input signal bit rate and the desired PE reduction rate, it is shown that the number of these devices can be easily optimized. For reducing the SOA nonlinearities on the output signal, a high-birefringent fiber loop mirror is used as an optical Gaussian filter. The achieved results depict that symmetry and the time-bandwidth product of the output signal obtained by this filter are significantly improved. The simulations are performed for high bit-rate signals (>50 Gbps); therefore, in the SOA model, all relevant nonlinear effects that occur in the subpicosecond regimes are taken into account.

SIGNAL (programming language)

Optical engineering

10.1117/1.oe.53.7.076107

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Citations (3)

Four-wave mixing characteristics among short optical pulses in semiconductor optical amplifiers with optimum time-delays

Narottam Kumar Das Nemai Chandra Karmakar Yasuhiro Yamayoshi Hitoshi Kawaguchi

We have analyzed the four-wave mixing (FWM) characteristics among short optical pulses in semiconductor optical amplifiers (SOAs) with optimum time-delays. An excellent agreement is observed between the simulated and experimental results of FWM in SOAs.

Four-wave mixing

10.1109/leos.2005.1547911

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Study of Optical Frequency Multiplication for Radio-Over-Fiber Systems

2006 IEEE Antennas and Propagation Society International Symposium (2006)

Narottam Kumar Das Nemai Chandra Karmakar Sushim Mukul Roy

We have studied and analyzed the optical frequency multiplication or optical harmonic up-conversion of low-frequency microwave signals while optically up-converting their frequencies. We have simulated the relative intensity of the harmonic components of the generated microwave signal for a triangular wavelength sweep. It has observed in the simulation results that with the increase of harmonic components, the relative intensity decreases for the low values of plate reflectivity

Harmonic

Intensity

SIGNAL (programming language)

Harmonic Analysis

10.1109/aps.2006.1711362

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Analysis of basic four-wave mixing characteristics in a semiconductor optical amplifier by the finite-difference beam propagation method

IEEE Journal of Quantum Electronics (2000)

Narottam Kumar Das Yasuhiro Yamayoshi Hitoshi Kawaguchi

We have numerically analyzed nondegenerate four-wave mixing (FWM) among short optical pulses in a semiconductor optical amplifier (SOA) by the finite-difference beam propagation method (FD-BPM). We used the nonlinear propagation equation taking into account gain spectrum dynamic gain saturation which depends on carrier depression, carrier heating, and spectral hole-burning, group velocity dispersion, self-phase modulation, and two-photon absorption. To analyze FWM in an SOA, the evolution in time and spectral domain of two input optical pulses with different frequencies during propagation was calculated. From this simulation, it has become clear that the method me used here is a very useful technique for simulating FWM characteristics in SOA's. We also found that the wavelength dependence of the gain is crucial if the detuning is larger than 1 THz.

Beam propagation method

Four-wave mixing

10.1109/3.880659

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Citations (67)

Analysis of input pump pulse energy optimization for maximum four-wave mixing conversion efficiency in semiconductor optical amplifier

Optical Engineering (2012)

Seyed Rasoul Hosseini Mohammad Razaghi Narottam Kumar Das

We configure the input pump pulse energy of semiconductor optical amplifiers (SOAs) to maximize the four-wave mixing (FWM) con- version efficiency. We simulate the propagation of optical waves in the SOA using the nonlinear propagation equation, taking into account the gain spectrum dynamics, gain saturation, which depends on carrier deple- tion, carrier heating, spectral hole-burning, group velocity dispersion, self- phase modulation, and two photon absorption. Our simulation results con- firm that corresponding to each input probe pulse, there is an input pump pulse with optimum energy that maximizes the FWM conversion efficiency in the SOA. We introduce a pattern for tuning the input pump pulse energy of SOA, which leads to saving the energy in practical applications. We show that the FWM conversion efficiency will decrease when the input pump pulse energy increases from its optimum point. Moreover, for further input pump pulse energies, the width of the generated FWM pulse increases, and its energy will remain constant. © 2012 Society of Photo-Optical

Four-wave mixing

Energy transformation

Optical Pumping

10.1117/1.oe.51.7.075004

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Four-Wave Mixing Characteristics with Optimum Time-Delays Between Pump-Probe Pulses in Semiconductor Optical Amplifiers

Narottam Kumar Das Nemai Chandra Karmakar Yasuhiro Yamayoshi Hitoshi Kawaguchi

We have analyzed the four-wave mixing (FWM) characteristics with optimum time-delays between pump and probe pulses in semiconductor optical amplifiers (SOAs) by the finite-difference beam propagation method (FD-BPM). The study of FWM characteristics with optimum time-delays between pump and probe pulses in SOAs has the importance to achieve the high FWM conversion efficiency and to clarify the timing jitter. From the simulations, we have clarified that the FWM conversion efficiency increases with optimum time-delays between pump and probe pulses. In the experiment, we have found the same tendency. Therefore, we have obtained an excellent agreement between the simulation and experimental results of FWM characteristics with optimum time-delays between pulses in SOAs.

Four-wave mixing

10.1109/icece.2006.355284

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Citations (0)

Numerical Simulations of Four-Wave Mixing among Short Optical Pulses in Semiconductor Optical Amplifiers by the Beam Propagation Method

Narottam Kumar Das

Four-wave mixing

Beam propagation method

10.11501/3178618

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Citations (2)

Nonlinear propagation and wave mixing characteristics of pulses in semiconductor optical amplifiers

Microwave and Optical Technology Letters (2008)

Narottam Kumar Das Nemai Chandra Karmakar

Nonlinear propagation and wave mixing characteristics of pulses in semiconductor optical amplifiers (SOAs) are analyzed using the finite-difference beam propagation method (FD-BPM). From the analyzed output waveform it is found that the peak positions of pulses are shifted to the leading edge. The output spectra are red-shifted and the dips are found at the higher frequency side in the frequency spectra. Two pulses propagate in SOAs and four-wave mixing (FWM) characteristics are obtained. Next, all-optical demultiplexing (DEMUX) characteristics of pulses in SOAs based on FWM are analyzed. From this analysis, it is clear that the SOAs with wider gain bandwidth are required for faster DEMUX operation. The DEMUX characteristics from the time-multiplexed signals by the repetitive pump pulses are also analyzed. The FWM signal intensity decreases with the strong pump pulses. However, there is no pattern effect due to gain saturation of pulses, because the pump pulses are injected continuously. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1223–1227, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23350

Four-wave mixing

10.1002/mop.23350

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Citations (6)

Comparison of different plasmonic nanograting profiles for quality light absorption in nanostructured metal-semiconductor-metal photodetectors

Optical Engineering (2013)

Farzaneh Fadakar Masouleh Narottam Kumar Das Hamid Reza Mashayekhi

We have demonstrated the possibility of quality light absorption in plasmonic nanostructured metal-semiconductor-metal (MSM) photodetectors with different groove shapes and analyzed the device performance by varying the physical parameters. The simulations revealed the quality light absorption for various nanogratings. The MSM photodetectors (MSM-PDs) utilizing nanostructure fabrication enable future high-speed devices to achieve high-responsivity bandwidth product. Finite difference time-domain method is used to evaluate the quality light absorption by plasmonics one dimensional nanostructures with the illumination of transverse magnetic light, since the surface plasmon polariton excitation is polarization sensitive. In our modeling, various nanograting profiles incorporated on the conventional MSM-PDs perform in different ways to improve the light absorption capacity in the subwavelength aperture region of the device. Therefore, the grooves' shape and size are the effective parameters to enhance the light concentration below the diffraction limit. The simulation results demonstrated the light absorption enhancement of ∼33.6 times for newly introduced nonlinearly tapered (or trapezoidal) ellipse wall nanogratings with the aid of plasmonic nanogratings effects.

Nanophotonics

Ray

10.1117/1.oe.52.12.127101

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Citations (20)