scholarly journals Shaping Lightwaves in Time and Frequency for Optical Fiber Communication

2021 ◽  
Author(s):  
Junho Cho ◽  
Xi Chen ◽  
Greg Raybon ◽  
Di Che ◽  
Ellsworth Burrows ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Chromatic Dispersion ◽  
Kerr Nonlinearity ◽  
Optical Fiber Communication ◽  
Fiber Communication ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
Fiber Link ◽  
The Impact ◽  
Low Dispersion

Abstract In optical communications, sphere shaping is used to limit the energy of lightwaves to within a certain value over a period. This minimizes the energy required to contain information, allowing the rate of information transmission to approach the theoretical limit if the transmission medium is linear. In optical fiber, however, the sphere shaping induces Kerr nonlinearity in a peculiar way that makes analysis of transmission performance difficult, potentially lowering the communications capacity. In this article, we show how the impact of sphere shaping on Kerr nonlinearity varies with the chromatic dispersion and the structure of shaped lightwaves in time and frequency, and give insights into why the structure matters. As a practical consequence, by optimally controlling the structure of lightwaves in time and frequency, it is experimentally demonstrated that the information rate can be increased by up to 25% in low-dispersion channels on a 2824-km dispersion-managed wavelength-division multiplexed optical fiber link.

scholarly journals ANALISIS KOMPENSASI DISPERSI MENGGUNAKAN PENGUAT RAMAN PADA JARINGAN WDM (WAVELENGTH DIVISION MULTIPLEXING) DALAM KOMUNIKASI SERAT OPTIK

2018 ◽  
Vol 15 (2) ◽  
pp. 88
Author(s):  
Roby Ikhsan ◽  
Romi Fadli Syahputra ◽  
Saktioto Saktioto
Keyword(s):  
Optical Fiber ◽  
Wavelength Division Multiplexing ◽  
Data Transmission ◽  
Dispersion Compensation ◽  
Optical Fiber Communication ◽  
Fiber Communication ◽  
Wavelength Division ◽  
Fiber Raman Amplifier ◽  
Wdm Network ◽  
Transmission Speed

The discovery of optical fiber cause widespread revolution of communication system. Optical fiber communication has excellency on data transmission speed, security, flexibility, and broadly bandwidth. The applying of WDM network can broaden the bandwidth so that the transmission performance becomes more splendid. Although some factors such as dispersion, attenuation, and scattering can hinder the performance of fiber optic on sending data. Moreover dispersion can wreck data and spread pulse as it travels alongs fiber so that causing interference. There is some methods  of dispersion compensation. In this paper, Fiber Raman Amplifier is used on WDM network to strengthen signal which is sent to detector. This research utilize simulation approachment  with various bandwidth and length fiber. The results show lowest BER value and highest Q-factor at bandwidth frequency of 30 GHz and fiber length of 20 km.

scholarly journals Mitigating the Impact of Noise on Nonlinear Frequency Division Multiplexing

2020 ◽  
Vol 10 (24) ◽  
pp. 9099
Author(s):  
Stella Civelli ◽  
Enrico Forestieri ◽  
Marco Secondini
Keyword(s):  
Dispersion Compensation ◽  
Kerr Nonlinearity ◽  
Optical Fiber Communication ◽  
Frequency Division Multiplexing ◽  
Nonlinear Frequency ◽  
Frequency Division ◽  
Fiber Communication ◽  
Range Rate ◽  
Conventional Systems ◽  
The Impact

In the past years, nonlinear frequency division multiplexing (NFDM) has been investigated as a potentially revolutionary technique for nonlinear optical fiber communication. However, while NFDM is able to exploit the Kerr nonlinearity, its performance lags behind that of conventional systems. In this work, we first highlight that current implementations of NFDM are strongly suboptimal, and, consequently, oversensitive to noise: the modulation does not ensure a large minimum distance between waveforms, while the detection is not tailored to the statistics of noise. Next, we discuss improved detections strategies and modulation techniques, proposing some effective approaches able to improve NFDM. Different flavors of NFDM are compared through simulations, showing that (i) the NFDM performance can be significantly improved by employing more effective detection strategies, with a 5.6 dB gain in Q-factor obtained with the best strategy compared to the standard strategy; (ii) an additional gain of 2.7 dB is obtained by means of a simple power-tilt modulation strategy, bringing the total gain with respect to standard NFDM to 8.3 dB; and (iii) under some parameters range (rate efficiency η≤30%), the combination of improved modulation and detection allows NFDM to outperform conventional systems using electronic dispersion compensation.

scholarly journals Performance Enhancement of DWDM-FSO Optical Fiber Communication Systems Based on Hybrid Modulation Techniques under Atmospheric Turbulence Channel

Photonics ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 464
Author(s):  
Mohammed R. Hayal ◽  
Bedir B. Yousif ◽  
Mohamed A. Azim
Keyword(s):  
Optical Fiber ◽  
Atmospheric Turbulence ◽  
Adaptive Optics ◽  
Communication Systems ◽  
Optical Fiber Communication ◽  
Passive Optical Network ◽  
Communication Link ◽  
Fiber Communication ◽  
Digital Pulse ◽  
The Impact

In this paper, we enhance the performance efficiency of the free-space optical (FSO) communication link using the hybrid on-off keying (OOK) modulation, M-ary digital pulse position modulation (M-ary DPPM), and M-pulse amplitude and position modulation (M-PAPM). This work analyzes and enhances the bit error rate (BER) performance of the moment generating function, modified Chernoff bound, and Gaussian approximation techniques. In the existence of both an amplified spontaneous emission (ASE) noise, atmospheric turbulence (AT) channels, and interchannel crosstalk (ICC), we propose a system model of the passive optical network (PON) wavelength division multiplexing (WDM) technique for a dense WDM (DWDM) based on the hybrid fiber FSO (HFFSO) link. We use eight wavelength channels that have been transmitted at a data rate of 2.5 Gbps over a turbulent HFFSO-DWDM system and PON-FSO optical fiber start from 1550 nm channel spacing in the C-band of 100 GHz. The results demonstrate (2.5 Gbps × 8 channels) 20 Gbit/s-4000 m transmission with favorable performance. In this design, M-ary DPPM-M-PAPM modulation is used to provide extra information bits to increase performance. We also propose to incorporate adaptive optics to mitigate the AT effect and improve the modulation efficiency. We investigate the impact of the turbulence effect on the proposed system performance based on OOK-M ary- PAPM-DPPM modulation as a function of M-ary DPPM-PAPM and other atmospheric parameters. The proposed M-ary hybrid DPPM-M-PAPM solution increases the receiver sensitivity compared to OOK, improves the reliability and achieves a lower power penalty of 0.2–3.0 dB at low coding level (M) 2 in the WDM-FSO systems for the weak turbulence. The OOK/M-ary hybrid DPPM-M-PAPM provides an optical signal-to-noise ratio of about 4–8 dB of the DWDM-HFFSO link for the strong turbulence at a target BER of 10−12. The numerical results indicate that the proposed design can be enhanced with the hybrid OOK/M-DPPM and M-PAPM for DWDM-HFFSO systems. The calculation results show that PAPM-DPPM has increased about 10–11 dB at BER of 10−12 more than the OOK-NRZ approach. The simulation results show that the proposed hybrid optical modulation technique can be used in the DWDM-FSO hybrid links for optical-wireless and fiber-optic communication systems, significantly increasing their efficiency. Finally, the use of the hybrid OOK/M-ary DPPM-M-PAPM modulation schemes is a new technique to reduce the AT, ICC, ASE noise for the DWDM-FSO optical fiber communication systems.

Gain performance of cascaded and hybrid semiconductor optical amplifier in CWDM system

2014 ◽  
Vol 23 (01) ◽  
pp. 1450007 ◽  
Author(s):  
Khadijah Ismail ◽  
P. Susthitha Menon ◽  
Sahbudin Shaari ◽  
Abang Annuar Ehsan ◽  
Hesham Bakarman ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Wavelength Division Multiplexing ◽  
Semiconductor Optical Amplifier ◽  
Optical Fiber Communication ◽  
Fiber Amplifier ◽  
Optical Amplifier ◽  
Gain Bandwidth ◽  
Erbium Doped Fiber Amplifier ◽  
Fiber Communication ◽  
Wavelength Division

The incorporation of cascaded and hybrid-type optical amplifiers into the optical fiber link is advantageous for the purpose of achieving wide gain bandwidth of multi-wavelength coarse wavelength division multiplexing (CWDM) systems. Different amplifiers whose operating gain region differ from each other are connected in cascade, thus providing better gain performance as the overall gain is combined and flattened over a larger spectrum. In this paper, the effect of the crossover of the uniform gain of the semiconductor optical amplifier (SOA) and the nonuniform gain of erbium-doped fiber amplifier (EDFA) is analyzed using an in-line cascaded SOA-SOA and an in-line hybrid SOA-EDFA configuration in the amplification of an 8-channels CWDM system obtained from the simulation using Optisystem software. It was observed that the cascaded SOA-SOA produces higher gain of 25 dB and wider gain bandwidth of 60 nm compared to the hybrid SOA-EDFA configuration with maximum gain of only 24 dB and 40 nm bandwidth. In addition, better bit-error-rate (BER) performance which is within the typical values in optical fiber communication is also achieved from the cascaded SOA topology. Wider gain bandwidth obtained with the SOA-SOA configuration would permit the transmission of video application at 1551 nm in the proposed Ethernet CWDM system transmitted at 100 Mb/s data rates.

Evaluation of Chirped Fiber Bragg Grating with APD on Designed Optical Fiber Communication Link

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Suresh Kumar ◽  
Shiwani Rathee ◽  
Payal Arora
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Grating ◽  
Chromatic Dispersion ◽  
Optical Fiber Communication ◽  
Bragg Grating ◽  
Communication Link ◽  
Linear Quadratic ◽  
Fiber Communication ◽  
Eye Diagram ◽  
Apodization Function

AbstractApplication of fiber Bragg grating (FBG) in optical communication is an evolving field. In this research paper, various types of chirped FBG’s (CFBG) have been used with avalanche photodiode (APD) on the designed optical fiber communication (OFC) link. Data rate of 20 Gbps and return-to-zero modulation format has been kept as fixed parameters. The designed link has been evaluated for varying fiber lengths (100, 200, 300, 400 and 500 km), various type of CFBG’s (linear, quadratic, square root and cubic root) with Gaussian apodization function, varying grating lengths (10, 20, 30, 40 and 50 mm) and operating temperatures (5°C, 10°C, 15°C, 20°C, 25°C, 30°C). The designed OFC link has also been evaluated for APD with and without CFBG. The performance evaluation matrix parameters selected are Q-factor, bit error rate and eye diagram. The OFC link employing CFBG with APD has been found to be superior. In compensating chromatic dispersion, optimum results have been observed for linear CFBG with Gaussian apodization function in comparison to other types of CFBG with 50 mm grating length for the maximum transmission distance.

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