scholarly journals Application of the G'/G Expansion Method in Ultrashort Pulses in Nonlinear Optical Fibers

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Jiang Xing-Fang ◽  
Wang Jun ◽  
Wei Jian-Ping ◽  
Hua Ping
Keyword(s):  
Optical Fibers ◽  
Wavelength Division Multiplexing ◽  
Nonlinear Optical ◽  
Group Velocity Dispersion ◽  
Ultrashort Pulses ◽  
Expansion Method ◽  
Input Power ◽  
Trigonometric Function ◽  
High Order ◽  
Wavelength Division

With the increasing input power in optical fibers, the dispersion problem is becoming a severe restriction on wavelength division multiplexing (WDM). With the aid of solitons, in which the shape and speed can remain constant during propagation, it is expected that the transmission of nonlinear ultrashort pulses in optical fibers can effectively control the dispersion. The propagation of a nonlinear ultrashort laser pulse in an optical fiber, which fits the high-order nonlinear Schrödinger equation (NLSE), has been solved using the G'/G expansion method. Group velocity dispersion, self-phase modulation, the fourth-order dispersion, and the fifth-order nonlinearity of the high-order NLSE were taken into consideration. A series of solutions has been obtained such as the solitary wave solutions of kink, inverse kink, the tangent trigonometric function, and the cotangent trigonometric function. The results have shown that the G'/G expansion method is an effective way to obtain the exact solutions for the high-order NLSE, and it provides a theoretical basis for the transmission of ultrashort pulses in nonlinear optical fibers.

Optical Networks Performance Optimization Based on Hybrid Configurations of Optical Fiber Amplifiers and Optical Receivers

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
I. S. Amiri ◽  
Fatma Mohammed Aref Mahmoud Houssien ◽  
Ahmed Nabih Zaki Rashed ◽  
Abd El-Naser A. Mohammed
Keyword(s):  
Optical Fiber ◽  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Performance Optimization ◽  
Input Power ◽  
Fiber Amplifiers ◽  
Q Factor ◽  
Wavelength Division ◽  
Transmission Distance ◽  
Optical Fiber Amplifiers

AbstractThe 16-channels dense wavelength division multiplexing (DWDM) systems have been optimized by utilizing hybrid configurations of conventional optical fiber amplifiers (EDFA, RAMAN and SOA) and optical photodetectors (PIN, APD(Si) and APD(InGaAs)). The DWDM systems were implemented for 5 Gb/s channel speed using one of these configurations with 100 GHz channel spacing and 25 km amplifying section. The hybrid configurations are the combinations of (PIN + EDFA), (PIN + RAMAN), (PIN + SOA), (APD(Si) + EDFA), (APD(Si) + RAMAN), (APD(Si) + SOA), (APD(InGaAs) + EDFA), (APD(InGaAs) + RAMAN) and (APD(InGaAs) + SOA). Based on BER, Q-factor and eye diagrams, the performance was compared for these configurations under influences of various thermal noise levels of photodetectors over different fiber lengths ranging from 25 km up to 150 km. The results revealed that both APD structures give optimum performance at input power Pin = 5 dBm due to high internal avalanche gain. EDFA outperforms RAMAN and SOA amplifiers. SOA amplifier shows degraded performance because of nonlinearity effects induced. RAMAN amplifier seems to be the best alternative for long reach DWDM systems because it minimizes the effects of fiber nonlinearities. The configuration (APD(Si) + EDFA) is the most efficient and recommended to be used for transmission distance beyond 100 km due to its larger Q-factor.

scholarly journals Performance Analysis of Crosstalk Subcarrier Multiplexing and Wave Division Multiplexing in Optical Communication System

2021 ◽  
Author(s):  
Ebrahim E. Elsayed
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Communication ◽  
Stimulated Raman Scattering ◽  
Optical Network ◽  
Digital Signal ◽  
Input Power ◽  
Single Fiber ◽  
Wavelength Division ◽  
Channel Bandwidth ◽  
Subcarrier Multiplexing

Abstract In traditional optical communication, duplexity is achieved by using two fibers, each having a transmitter and a receiver. Economically, bidirectional wavelength division multiplexing (WDM) transmission systems utilizing a single fiber will be more attractive not only reducing the use of the fiber by a factor of two, but also the number of components. Duplex transmissions over a single fiber can double the capacity of an installed unidirectional link. The idea of this paper is to study another approach using the subcarrier multiplexing (SCM)-based optical network and evaluate the physical transmission quality of analog and digital signal using SCM approach and the characteristic of fiber nonlinear crosstalk such as stimulated Raman scattering, Cross phase modulation and four-wave mixing in the SCM externally modulation optical link. A suitable bandwidth of 890 – 950 MHz is selected for subcarriers and channel bandwidth of 200 KHz and carrier. By measuring the optical bit interference (OBI) performance limitations of the subcarrier multiplexing WDM optical transmission system is investigated. The OBI for 10 channels for input power 1 dB is -40 dB whereas for 110 channels the OBI is -20 dB separation of 250 KHz are considered.

Design of EDFA based 16 channel WDM system using counter directional high pump power

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Md. Asraful Sekh ◽  
Mijanur Rahim ◽  
Anjumanara Begam
Keyword(s):  
Pump Power ◽  
Wavelength Division Multiplexing ◽  
Input Power ◽  
Low Noise ◽  
Fiber Amplifiers ◽  
Wavelength Division ◽  
High Pump Power ◽  
Erbium Doped ◽  
High Pump ◽  
Channel Wavelength

Abstract In this paper, design of erbium-doped fiber amplifiers (EDFA) based 16 channel wavelength-division multiplexing (WDM) system for different pump powers and input signal levels using counter propagating pumping scheme is reported. Wavelength range between 1548 and 1560 nm in C-band with channel spacing of 0.75 nm at a bit rate of 10 Gbps are used. Input power given to all the channels is taken between −20 and −35 dBm with 3 dBm variation. Pump power levels between 100 and 500 mW at 980 nm wavelength are used. Low gain flatness with high gains and low noise figures are achieved with the proposed scheme.

Simulation Research on Strategy for Wavelength Division Multiplexing-Based Compensating Photon Polarization in Optical Fibers

2015 ◽  
Vol 35 (5) ◽  
pp. 0506003 ◽  
Author(s):  
王剑 Wang Jian ◽  
朱勇 Zhu Yong ◽  
周华 Zhou Hua ◽  
苏洋 Su Yang ◽  
张志永 Zhang Zhiyong
Keyword(s):  
Optical Fibers ◽  
Wavelength Division Multiplexing ◽  
Photon Polarization ◽  
Simulation Research ◽  
Wavelength Division

Comparative Analysis of High Speed 20/20 Gbps OTDM-PON, WDM-PON and TWDM-PON for Long-Reach NG-PON2

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Meet Kumari ◽  
Reecha Sharma ◽  
Anu Sheetal
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Optical Network ◽  
Access Network ◽  
Cost Effective ◽  
Input Power ◽  
Passive Optical Network ◽  
Wavelength Division ◽  
Transmission Distance ◽  
Wdm Pon

AbstractNowadays, bandwidth demand is enormously increasing, that causes the existing passive optical network (PON) to become the future optical access network. In this paper, next generation passive optical network 2 (NG-PON2) based, optical time division multiplexing passive optical network (OTDM-PON), wavelength division multiplexing passive optical network (WDM-PON) and time & wavelength division multiplexing passive optical network (TWDM-PON) systems with 20 Gbps (8 × 2.5 Gbps) downstream and 20 Gbps (8 × 2.5 Gbps) upstream capacity for eight optical network units has been proposed. The performance has been compared by varying the input power (−6 to 27 dBm) and transmission distance (10–130 km) in terms of Q-factor and optical received power in the presence of fiber noise and non-linearities. It has been observed that TWDM-PON outperforms OTDM-PON and WDM-PON for high input power and data rate (20/20 Gbps). Also, TWDM-PON shows its superiority for long-reach transmission up to 130 km, which is a cost-effective solution for future NG-PON2 applications.

COMPARISON OF INTERCHANNEL FOUR-WAVE MIXING WITH CONTINUOUS WAVES, QUASI-CONTINUOUS WAVES AND ULTRASHORT PULSES

2003 ◽  
Vol 12 (03) ◽  
pp. 377-384 ◽  
Author(s):  
SHIMING GAO ◽  
CHANGXI YANG ◽  
GUOFAN JIN
Keyword(s):  
Conversion Efficiency ◽  
Wavelength Division Multiplexing ◽  
Pulse Width ◽  
Continuous Wave ◽  
Ultrashort Pulses ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Propagation Length ◽  
Wavelength Division ◽  
Continuous Waves

We compare the interchannel four-wave mixing (FWM) in dense wavelength division multiplexing (DWDM) systems with continuous waves, quasi-continuous waves and ultrashort pulses. The differences are theoretically analyzed for the three inputs. We investigate the FWM conversion efficiency as a function of the channel spacing, the fiber length, the single bit energy and the pulse width. It is shown that the FWM effect in DWDM systems with quasi-continuous waves is the strongest and with ultrashort pulses is the lowest among the three cases. The FWM conversion efficiency changes periodically with the propagation length, and it is approximately an exponential function of the single bit energy. The performance of the pulse FWM effect versus the pulse width is different from that of the quasi-continuous wave FWM, which may be one possible way to suppress the interchannel FWM.

Current Advances in Development of Material in the Field of Wiring in Japan

1998 ◽  
Vol 531 ◽  
Author(s):  
S. Takagi ◽  
N. Ishii ◽  
D. Hashimoto
Keyword(s):  
Optical Fibers ◽  
Wavelength Division Multiplexing ◽  
New Technologies ◽  
High Density ◽  
Fiber Amplifiers ◽  
Wavelength Division ◽  
Access System ◽  
Plastic Optical Fibers ◽  
Transmission Speed

AbstractThis paper presents the current advances in the development of materials in the field of telecommunication wiring together with the background which created the need for the new technologies. The background is somewhat unique to the current socio-economical situation of Japan. The key technical areas, which are addressed in this paper, are; (1) fibers for transmission of over 1 Tbps by utilizing WDM (wavelength division multiplexing), (2) fibers for fiber amplifiers to replace repeaters within trunk lines, (3) high density cables with over 1000 fiber counts, (4) ABF (air blown fiber) for access system, (5) plastic optical fibers wiring in premises or offices operating at the transmission speed of over 200 Mbps.

Impact of Different Modulation Data Formats on DWDM System Using SOA With Narrow-Channel Spacing

2019 ◽  
Vol 40 (4) ◽  
pp. 435-439
Author(s):  
Aruna Rani ◽  
Manpreet Singh
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Power ◽  
Narrow Channel ◽  
Optical Amplifier ◽  
Input Power ◽  
Channel Spacing ◽  
Wavelength Division ◽  
Data Formats ◽  
Transmission Length ◽  
Eye Closure

Abstract In this paper, the transmission performance of 64×10 Gbps wavelength division multiplexing system using semiconductor optical amplifier (SOA) with 0.4nm channel spacing has been demonstrated with different modulation data formats. The suitability of various data formats like nonreturn to zero rectangular (NRZ-rectangular), nonreturn to zero raised cosine, return to zero raised cosine, return to zero rectangular, return to zero supergaussian and return to zero soliton for an optical transmission link at ‒40dBm signal input power is evaluated. The results have been carried out by evaluating the value of quality factor, bit error rate (BER), eye closure and received optical power. It is found that using NRZ-rectangular data format, the signal can travel up to a transmission length of 260 km with acceptable BER (1.10e-09) and Q-factor (15.0 dB), respectively.

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