scholarly journals Mitigation of Fiber Nonlinear Effects in 1.28 Tbps DQPSK Modulated DWDM System

2019 ◽  
Vol 23 (1) ◽  
pp. 3 ◽  
Author(s):  
Tomáš Huszaník ◽  
Ján Turán ◽  
Ĺuboš Ovseník
Keyword(s):  
Wavelength Division Multiplexing ◽  
Phase Modulation ◽  
Fractional Fourier Transform ◽  
High Capacity ◽  
Nonlinear Effects ◽  
Optical Signal ◽  
Wavelength Division ◽  
Time Frequency ◽  
Linear And Nonlinear ◽  
Dwdm System

The main limitation factor of high capacity multichannel DWDM (Dense Wavelength Division Multiplexing) systems are fiber nonlinear effects. The optical signal is severely degraded due to fiber nonlinear effects also known as Kerr fiber nonlinearity. Nonlinear effects under investigation are self-phase modulation (SPM) and cross-phase modulation (XPM). There are several methods to compensate these nonlinear distorts, some less or more effective. Nonlinear distort due to SPM and XPM can be effectively mitigated through implementation of optical DQPSK modulation over commonly used intensity modulation known as OOK (On-Off Keying). This paper presents a numerical simulation model of 1.28 Tbps DWDM system with optical DQPSK modulation. We present several scenarios and methods to mitigate fiber nonlinear effects including Fractional Fourier Transform (FrFT). Linear and nonlinear effects are considered together, so we implement the inline FrFT module in the optical domain which causes a time-frequency plane rotation to mitigate combined linear and nonlinear effects. The performance of proposed 1.28 Tbps DQPSK modulated DWDM system is evaluated in term of bit error rate (BER) and Q factor value.

REVIEW ARTICLE ON THE MITIGATION OF FOUR WAVE MIXING IN OPTICAL COMMUNICATION SYSTEM

2021 ◽  
Vol 15 (1) ◽  
pp. 53-65
Author(s):  
Robert Oluwayimika Abolade ◽  
Oluwaseun Olayinka Tooki ◽  
David Oluwagbemiga Aborisade
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Capacity ◽  
Nonlinear Effects ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Fibre Optics ◽  
Modulation Formats ◽  
Main Challenge ◽  
Dwdm System ◽  
Nonlinear Impairments

The main challenge faced in today's telecommunication is the ever increasing demand for bandwidth and data rates. The desire to expand the capacity of fiber optic communication to accommodate this demand accelerated the development of high capacity Dense Wavelength Division Multiplexing (DWDM) transmission equipment. However, nonlinear impairments are the fundamental limiting mechanisms to the amount of data that can be transmitted in DWDM. In DWDM, Four Wave Mixing is the most critical of nonlinear effects in fibre optics communication. This effect limits the DWDM’s channel capacity. There are numerous researches on nonlinear impairments that show the intricacy of FWM phenomena in DWDM system. This article present review of the several measures which have been carried out by researchers to overcome nonlinear effects in DWDM. Such measures include Modulation Formats, Channel Spacing, Channel Shuffling Algorithm and Electro-Optic Phase Modulation. The review provides insight into the methods, parameters and approaches used by other researchers. This will pave way for can thus lead to significant improvement in the design of DWDM system.

Transmission Performance of 112 Gb/s POLMUX QPSK Signal in OOK/DPSK WDM System

2020 ◽  
Vol 41 (2) ◽  
pp. 171-176
Author(s):  
Harmanpreet Kaur Sandhu ◽  
R.S Kaler ◽  
Gurpreet Kaur ◽  
Rajneesh Randhawa
Keyword(s):  
Phase Shift ◽  
Wavelength Division Multiplexing ◽  
Phase Modulation ◽  
Optical Signal ◽  
Phase Shift Keying ◽  
Error Vector Magnitude ◽  
Differential Phase Shift ◽  
Wavelength Division ◽  
Shift Keying ◽  
The Impact

AbstractIn this article, the impact of cross-phase modulation (XPM) and cross-polarization modulation (XpolM) on transmission of 112 Gb/s polarization multiplexed quadrature phase shift keying (POLMUX QPSK) signal in a wavelength division multiplexing (WDM) system has been investigated. This WDM system comprises of on-off keying (OOK) or differential phase shift keying (DPSK) channels. It is observed that the effects of XPM and XpolM are greatly reduced in a hybrid system of co-propagating OOK and DPSK channels. This is due to the dominance of phase modulation of DPSK signals rather than the intensity modulated OOK signals. The error vector magnitude (EVM) of the received optical signal is evaluated for the increase in number of neighbouring OOK and DPSK channels respectively within a bandwidth of 350 GHz. Also, the effect of increase in bit rate for two neighbouring OOK and DPSK channels has been observed individually on the 112 Gb/s POLMUX QPSK signal. It is concluded that DPSK signals display an improvement of −9.44 dB in EVM over OOK signals when there are eight neighbouring channels in the transmission system.

scholarly journals Performance evaluation and analysis of four waves mixing in DWDM optical communications

2021 ◽  
Author(s):  
Ebrahim E. Elsayed
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Wavelength Conversion ◽  
Power Level ◽  
Wave Length ◽  
Nonlinear Effects ◽  
Wdm Optical Networks ◽  
Component Reliability ◽  
Wavelength Division ◽  
Dwdm System

Abstract Optical nonlinearities give rise to many ubiquitous effects in optical fibres ’. These effects are interesting in themselves and can be detrimental in optical communication. In the Dense Wave length division multiplexing system (DWDM) the nonlinear effects plays important role .DWDM system offers component reliability, system availability and system margin. DWDM system carries different channels. Hence power level carried by fiber increases which generates nonlinear effect such as SPM, XPM, SRS, SBS and FWM. Four wave mixing (FWM) is one of the most troubling issues. The FWM gives crosstalk in DWDM system whose channel spacing is narrow. Wavelength exchanging enables data swapping between two different wavelengths simultaneously. These phenomena have been used in many applications in Wavelength Division Multiplexing (WDM) optical networks such as, wavelength conversion, wavelength sampling, optical 3R, optical interconnects and optical add-drop multiplexing.

scholarly journals DWDM Networks When Using Raman Configurations with DCF Fibers

2017 ◽  
Vol 15 (41) ◽  
pp. 27-43
Author(s):  
Geovanny Andrés Muñoz Castro
Keyword(s):  
Wavelength Division Multiplexing ◽  
Phase Modulation ◽  
Dispersion Compensation ◽  
Chromatic Dispersion ◽  
Polarization Mode Dispersion ◽  
Nonlinear Effects ◽  
Wavelength Division ◽  
Mode Dispersion ◽  
Linear Effects ◽  
Theoretical Foundations

In this paper, the basic theoretical foundations regarding a DWDM [Dense Wavelength Division Multiplexing] network when using Raman configurations with DCF [Dispersion Compensation Fiber] are studied, through the revision of: linear effects, such as noise, loss, chromatic dispersion and PMD [Polarization Mode Dispersion]; and nonlinear effects, such as Self-Phase Modulation [SPM], Cross-Phase Modulation [XPM] and Four-Wave Mixing [FWM], compared to Optical Monitoring Parameters [OPM].

scholarly journals Performance evaluation and analysis of four waves mixing in DWDM optical communications

2021 ◽  
Author(s):  
Ebrahim E. Elsayed
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Wavelength Conversion ◽  
Power Level ◽  
Wave Length ◽  
Nonlinear Effects ◽  
Wdm Optical Networks ◽  
Component Reliability ◽  
Wavelength Division ◽  
Dwdm System

Abstract Optical nonlinearities give rise to many ubiquitous effects in optical fibres ’. These effects are interesting in themselves and can be detrimental in optical communication. In the Dense Wave length division multiplexing system (DWDM) the nonlinear effects plays important role .DWDM system offers component reliability, system availability and system margin. DWDM system carries different channels. Hence power level carried by fiber increases which generates nonlinear effect such as SPM, XPM, SRS, SBS and FWM. Four wave mixing (FWM) is one of the most troubling issues. The FWM gives crosstalk in DWDM system whose channel spacing is narrow. Wavelength exchanging enables data swapping between two different wavelengths simultaneously. These phenomena have been used in many applications in Wavelength Division Multiplexing (WDM) optical networks such as, wavelength conversion, wavelength sampling, optical 3R, optical interconnects and optical add-drop multiplexing.

Efficient Routing of Star–Ring Hybrid Topology with Optical Add and Drop Multiplexer in DWDM System

2016 ◽  
Vol 37 (4) ◽  
Author(s):  
Anju Bala ◽  
Sanjeev Dewra
Keyword(s):  
Wavelength Division Multiplexing ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Wavelength Routing ◽  
Ring Network ◽  
Channel Spacing ◽  
Wavelength Division ◽  
Hybrid Topology ◽  
Dwdm System ◽  
Add And Drop Multiplexer

AbstractThis paper investigates the performance of star–ring hybrid topology networks with optical add and drop multiplexer (OADM) in dense wavelength division multiplexing (DWDM) system with 0.8 nm channel spacing at different bit rates (5, 10 and 15 Gbps) in terms of bit error rate (BER), quality factor and optical signal-to-noise ratio (OSNR). OADM has the capability to add and drop the new channels and provides the wavelength routing between star and ring topologies. It is observed that the hybrid topology supports 128 users on upper and lower ends with 150 km distance between the nodes of ring network without dispersion compensating fiber.

scholarly journals Performance evaluation and analysis of four waves mixing in DWDM optical communications

2021 ◽  
Author(s):  
Ebrahim E. Elsayed
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Wavelength Conversion ◽  
Power Level ◽  
Wave Length ◽  
Nonlinear Effects ◽  
Wdm Optical Networks ◽  
Component Reliability ◽  
Wavelength Division ◽  
Dwdm System

Abstract Optical nonlinearities give rise to many ubiquitous effects in optical fibres. These effects are interesting in them and can be detrimental in optical communication. In the Dense Wave length division multiplexing system (DWDM) the nonlinear effects plays important role .DWDM system offers component reliability, system availability and system margin. DWDM system carries different channels. Hence power level carried by fiber increases which generates nonlinear effect such as SPM ,XPM, SRS, SBS and FWM. Four waves mixing (FWM) is one of the most troubling issues. The FWM gives crosstalk in DWDM system whose channel spacing is narrow. Wavelength exchanging enables data swapping between two different wavelengths simultaneously. These phenomena have been used in many applications in Wavelength Division Multiplexing (WDM) optical networks such as, wavelength conversion, wavelength sampling, optical 3R, optical interconnects and optical add-drop multiplexing.

8CH AWG Multi/Demultiplexer With MEMS Variable Optical Attenuator

2003 ◽  
Author(s):  
K. Ishikawa ◽  
Q. Yu
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Signal ◽  
Arrayed Waveguide Grating ◽  
Optical Contrast ◽  
Network Systems ◽  
Micro Electro Mechanical Systems ◽  
Wavelength Division ◽  
Power Intensity ◽  
Variable Optical Attenuator ◽  
Arrayed Waveguide

An integrated arrayed waveguide grating multi/demultiplexer (AWG) with a micro-electro-mechanical systems (MEMS) based variable optical attenuator (VOA) is reported. The device consists of an AWG based on silica and a MEMS-VOA chip. The MEMS chip includes 100 μm × 100 μm polysilicon shutter plates coated with gold and electrostatic comb-drive actuators. The MEMS chip is interposed in a trench located in the middle of the I/O waveguides of the AWG to tune the optical transmitting power intensity through the waveguides continuously. The MEMS-VOA shutters have more than a 10 μm displacement. Using those shutters, 30 dB optical contrast from 5 dB at the transmit state to 35 dB at the isolation state is achieved. The obtained attenuation contrast is greater than that of a conventional waveguide-based Mach-Zehnder interferometer VOA and sufficient to adjust and equalize the optical signal power in the wavelength division multiplexing (WDM) network systems.

DWDM Transmission with LEAF and RDF Structure in 40 Gb/s Single MZM with RZ-DPSK Modulation

2017 ◽  
Vol 38 (1) ◽  
Author(s):  
Hsiu-Sheng Lin ◽  
Po-Chou Lai
Keyword(s):  
Wavelength Division Multiplexing ◽  
Dispersion Compensation ◽  
Fiber Amplifier ◽  
Effective Area ◽  
Erbium Doped Fiber Amplifier ◽  
Differential Phase Shift ◽  
Wavelength Division ◽  
Modulation Format ◽  
Shift Keying ◽  
Dwdm System

AbstractWe propose the experiment transport of 48 Chs 40 Gb/s dense wavelength division multiplexing (DWDM) system that uses larger effective area fiber (LEAF) in combination with reverse dispersion fiber (RDF), which is a dispersion compensation device, in C band (1,530–1,560 nm) and L band (1,570–1,610 nm) wavelength range to solve the dispersion program. The single Mach–Zehnder modulation (MZM) format with erbium-doped fiber amplifier (EDFA) configuration to generate return-to-zero differential phase-shift keying (RZ-DPSK) modulation signal can compensate dispersion impairment in 48×40 Gb/s DWDM system. The proposed 48×40 Gb/s DWDM system successfully employs single MZM RZ-DPSK modulation format to reduce modulation complex configuration with EDFA to promote the power signal and using LEAF and RDF in 28 spans over 3,360 km ultra-long-haul fiber transmission successfully.

scholarly journals Cylindrical vector beam multiplexer/demultiplexer using off-axis polarization control

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Shuqing Chen ◽  
Zhiqiang Xie ◽  
Huapeng Ye ◽  
Xinrou Wang ◽  
Zhenghao Guo ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Transmission Rate ◽  
High Capacity ◽  
Wavelength Division ◽  
Polarization Control ◽  
Vector Beam ◽  
Vector Mode ◽  
Control Technologies ◽  
Polarization Division Multiplexing ◽  
Cylindrical Vector Beam

AbstractThe emergence of cylindrical vector beam (CVB) multiplexing has opened new avenues for high-capacity optical communication. Although several configurations have been developed to couple/separate CVBs, the CVB multiplexer/demultiplexer remains elusive due to lack of effective off-axis polarization control technologies. Here we report a straightforward approach to realize off-axis polarization control for CVB multiplexing/demultiplexing based on a metal–dielectric–metal metasurface. We show that the left- and right-handed circularly polarized (LHCP/RHCP) components of CVBs are independently modulated via spin-to-orbit interactions by the properly designed metasurface, and then simultaneously multiplexed and demultiplexed due to the reversibility of light path and the conservation of vector mode. We also show that the proposed multiplexers/demultiplexers are broadband (from 1310 to 1625 nm) and compatible with wavelength-division-multiplexing. As a proof of concept, we successfully demonstrate a four-channel CVB multiplexing communication, combining wavelength-division-multiplexing and polarization-division-multiplexing with a transmission rate of 1.56 Tbit/s and a bit-error-rate of 10−6 at the receive power of −21.6 dBm. This study paves the way for CVB multiplexing/demultiplexing and may benefit high-capacity CVB communication.

Sign in / Sign up

Export Citation Format

Share Document