Dispersion Compensation Research Papers - Academia.edu (original) (raw)

In this paper, an ultra-high capacity inter-satellite optical wireless communication (OWC) system using different modulation is presented. The proposed system is achieved by using 64-channel dense wavelength division multiplexing (DWDM)... more

In this paper, an ultra-high capacity inter-satellite optical wireless communication (OWC) system using different modulation is presented. The proposed system is achieved by using 64-channel dense wavelength division multiplexing (DWDM) by different modulation methods. The inter-satellite link has been designed for various distance and external modulation of carrier-suppressed return-to-zero (CSRZ), duo binary return-to-zero (DRZ) and modified duo binary return-to-zero (MDRZ) at different bit rate. The proposed system is simulated at different bit rates, 10, 20 and 40 Gbps by using atmosphere model. To show the good performance of the proposed system, its eye diagram, received power and Q-factor are shown. The comparative analyses show that at 10 and 20 Gbps, the proposed system has maximum quality factor, Q, and minimum bit error rate (BER) for all three modulations. Also, at 40 Gbps the MDRZ modulation has better performance in comparison to the CSRZ and DRZ modulations. © 2016 El...

In this paper the hybrid combination of Erbium doped fiber amplifier (EDFA) and Raman amplifier are projected for wavelength division multiplexed system. Gain flatness achieved for C+L Band through hybrid amplifier is more than EDFA with... more

In this paper the hybrid combination of Erbium doped fiber amplifier (EDFA) and Raman amplifier are projected for wavelength division multiplexed system. Gain flatness achieved for C+L Band through hybrid amplifier is more than EDFA with Gain flattening filter. The hybrid optical amplifier has maximum gain of 25.6259dB, gain flatness of 3.17dB and noise figure less than 6dB at input power -20dBm of each channel.

This paper introduces a backpropagation-based technique for the calibration of the mismatch errors of time-interleaved analog to digital converters (TI-ADCs). This technique is applicable to digital receivers such as those used in... more

This paper introduces a backpropagation-based technique for the calibration of the mismatch errors of time-interleaved analog to digital converters (TI-ADCs). This technique is applicable to digital receivers such as those used in coherent optical communications. The error at the slicer of the receiver is processed using a modified version of the well known backpropagation algorithm from machine learning. The processed slicer error can be directly applied to compensate the TI-ADC mismatch errors with an adaptive equalizer, or it can be used to digitally estimate and correct said mismatch errors using analog techniques such as delay cells and programmable gain amplifiers (PGA). The main advantages of the technique proposed here compared to prior art are its robustness, its speed of convergence, and the fact that it always works in background mode, independently of the oversampling factor and the properties of the input signal, as long as the receiver converges. Moreover, this techniq...

In Fiber-Optics communication network pulse broadening due to chromatic dispersion becomes an important factor for signal quality degradation. This paper review of the chromatic dispersion compensation in optical fiber communication... more

In Fiber-Optics communication network pulse broadening due to chromatic dispersion becomes an important factor for signal quality degradation. This paper review of the chromatic dispersion compensation in optical fiber communication system. In optical communication system to compensate dispersion Fiber Bragg grating (FBG) is one amongst the applicable and necessary components. During this the appliance of chirped FBG was studied as a dispersion compensator in optical communication systems. This paper studied the various types of simulation in optical fiber communication system. The reviews of the analysis based on the chromatic dispersion are studied in the paper. There are three widely used dispersion compensation techniques i.e. Fiber Bragg Grating (FBG), EDFA and Dispersion Compensation Fiber (DCF). A fiber brag grating (FBG) is one of the most important and applicable component in an optical communication system. The use of chirped FBG has been studied as a dispersion compensato...

The performance of Erbium Doped Fiber Amplifier (EDFA) depends on various parameters like, Er+3 doping concentration, active fiber length, pump power, pumping wavelength etc. In this paper, the analysis of gain and noise figure (NF) of... more

The performance of Erbium Doped Fiber Amplifier (EDFA) depends on various parameters like, Er+3 doping concentration, active fiber length, pump power, pumping wavelength etc. In this paper, the analysis of gain and noise figure (NF) of EDFA is done at different pump power (10, 50, & 100mw) and at different fiber length (10, 30, & 50m) for different pumping configuration i.e. forward pumping, backward pumping, and bidirectional pumping operating in C-band at high data rate.

E-mail: tshioda@mail.saitama-u.ac.jp Fast frequency scanning laser with discrete frequency step of several hundred GHz is proposed. The laser simply consists of laser medium and frequency tuning part in a ring configuration. The lasing... more

E-mail: tshioda@mail.saitama-u.ac.jp Fast frequency scanning laser with discrete frequency step of several hundred GHz is proposed. The laser simply consists of laser medium and frequency tuning part in a ring configuration. The lasing frequency, allowed by a Fabry-Perot etalon, is discretely oscillated in the laser cavity with scanning resonant-frequency. In this paper, the resonant-frequency was swept by a combination of polygon scanner and diffraction grating as a demonstration. The discrete frequency step of a 435 GHz was confirmed with 14 kHz scanning rate and 1.8μs of frequency switching time

In this work an approach for detecting and locating impacts on comp osite plates using piezoelectric transducers is presented. Low velocity impacts are among the most common causes that tr igger the advance of barely visible damages in... more

In this work an approach for detecting and locating impacts on comp osite plates using piezoelectric transducers is presented. Low velocity impacts are among the most common causes that tr igger the advance of barely visible damages in aerospace composite structures. Deeper knowledge of the location of potentially damaged areas allows to evaluate composite structures with less effort and significantly reduces system downtime. A quasi-isotropic composite plate composed of 8 layers are investigated in finite element software ABAQUS. Wave propagation speed in a material and time delay between stress waves, opens way to estimate impact locus. However, m easuring velocity in anisotropic material is not very simple due to different mechanical properties along differ ent directions. An array of piezoelectric sensors provides the history of plate deflections. Hitting some impacts at desire d plac s and measuring time difference between voltages measured by sensors, enable the velocity curve...

Reflective semiconductor optical amplifiers (RSOAs) are key elements for modern optical communications. Despite their widespread deployment, their performance when intended for ultrafast data amplification is limited by their inherently... more

Reflective semiconductor optical amplifiers (RSOAs) are key elements for modern optical communications. Despite their widespread deployment, their performance when intended for ultrafast data amplification is limited by their inherently slow gain dynamics. In this paper, we propose to employ a birefringent fiber loop (BFL) to compensate for the RSOA pattern-dependent behavior and extend its operation well beyond that allowed by its nominal optical modulation bandwidth. We apply a reduced model to describe the RSOA response and quantify the RSOA output distortion by means of a non-return-to-zero data pulse overshoot. We validate the outcomes of this model in the time domain both for the RSOA alone and with the assistance of the BFL by an extensive comparison to available measurements. The excellent matching between simulation and experimental results allows us to further investigate the impact of critical operating parameters and derive specifications for them so that the performance...

In this article is given research results about nonlinear phenomena four-wave mixing (FWM) potential use in the optical flber (OF) nonlinear coe-cient ∞ and polarization mode dispersion (PMD) evaluation. First of all we give theoretical... more

In this article is given research results about nonlinear phenomena four-wave mixing (FWM) potential use in the optical flber (OF) nonlinear coe-cient ∞ and polarization mode dispersion (PMD) evaluation. First of all we give theoretical review about FWM causes in the OF. Afterwards the ∞ parameter measurement technique based on FWM is proposed. Fiber used in the experimental measurements is highly non-linear flber (HNLF) wich ∞ parameter is unknown and therefore is suitable for this research work.

A study has been carried out on the Cu doping and PVA capping induced optical property changes in ZnS : Cu nanocrystalline powders and thin film. For this study, ZnS : Cu nanopowders with Cu concentrations of 0.1%, 0.15%, 0.2%, 0.3% and... more

A study has been carried out on the Cu doping and PVA capping induced optical property changes in ZnS : Cu nanocrystalline powders and thin film. For this study, ZnS : Cu nanopowders with Cu concentrations of 0.1%, 0.15%, 0.2%, 0.3% and 0.4% are synthesized by the wet chemical method. The polyvinyl alcohol (PVA)-capped ZnS thin film with 0.2% Cu concentration and various PVA concentrations are prepared by the spin-coating method. The microstructures of the samples are investigated by the X-ray diffraction (XRD) patterns and transmission electron microscopy (TEM). The results show that the prepared samples belong to the wurtzite structure with the average particle size of about 3–7 nm. The optical properties of samples are studied by measuring absorption and photoluminescence (PL) spectra in the wavelength range from 300 nm to 900 nm at 300 K. It is shown that the luminescent intensity of ZnS : Cu nanopowders reaches the highest intensity for optimal Cu concentration of 0.2% with the...