scholarly journals Hybrid compensation of polarization-multiplexed QPSK optical format for high bit rate networks

2020 ◽  
Vol 20 (3) ◽  
pp. 1325
Author(s):  
Omar Y. Shabaan ◽  
Omar A. Athab
Keyword(s):  
Single Channel ◽  
Optical Network ◽  
Digital Signal ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Bit Rate ◽  
Fiber Network ◽  
Transmission Distance ◽  
Regeneration Stage ◽  
High Bit Rate

<span lang="EN-GB">Transmitting the highest capacity throughput over the longest possible distance without any regeneration stage is an important goal of any long-haul optical network system. Accordingly, Polarization-Multiplexed Quadrature Phase-Shift-Keying (PM-QPSK) was introduced lately to achieve high bit-rate with relatively high spectral efficiency. Unfortunately, the required broad bandwidth of PM-QPSK increases the linear and nonlinear impairments in the physical layer of the optical fiber network. Increased attention has been spent to compensate for these impairments in the last years. In this paper, Single Mode Fiber (SMF), single channel, PM-QPSK transceiver was simulated, with a mix of optical and electrical (Digital Signal Processing (DSP)) compensation stages to minimize the impairments. The behaviour of the proposed system was investigated under four conditions: without compensation, with only optical compensator, with only DSP compensator and finally with both compensators. An evidence improvement was noticed in the case of hybrid compensation, where the transmission distance was multiplied from (720 km) to more than (3000 km) at 40 Gb/s.</span>

scholarly journals Extinction Ratio and the Fiber Optic Transmission Networks

2021 ◽  
Vol 12 (6) ◽  
pp. 2244-2252
Author(s):  
Ved Nath Jha, Supriya Rani, Ved Nath Jha
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Optical Network ◽  
Extinction Ratio ◽  
Wavelength Division Multiplex ◽  
Single Mode ◽  
Fiber Amplifier ◽  
Single Mode Fiber ◽  
Erbium Doped Fiber Amplifier ◽  
Fiber Network

In the fiber optic communication network for example,- FTTH, EPON, NBN, OTN and so on, the most important components are fiber length between transmitter and receiver point. So, to make, cheap and meaningful communication through optical fiber it must be required to calculate how and what amount of signal is transmitted with the given length of the fiber. Finally, it is said that the optical fiber network have several limitations like extension ratio. So, it is necessary to investigate its affect on the performance of the Optical Network. This research is based on simulation by OptiSystem 0.17 on the basis of Dense wavelength division multiplex (DWDM) technology, Erbium Doped Fiber Amplifier (EDFA), dispersion Compensating Fiber (DCF) and single mode fiber of length 50–100 km.

scholarly journals Unrepeatered 240-km 64-QAM Transmission Using Distributed Raman Amplification over SMF Fiber

2020 ◽  
Vol 10 (4) ◽  
pp. 1433
Author(s):  
P. Rosa ◽  
G. Rizzelli ◽  
X. Pang ◽  
O. Ozolins ◽  
A. Udalcovs ◽  
...  
Keyword(s):  
Digital Signal Processor ◽  
Back Propagation ◽  
Digital Signal ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Raman Amplification ◽  
Raman Fiber Laser ◽  
Modulation Format ◽  
Transmission Distance ◽  
Nonlinear Compensation

We present a theoretical and experimental investigation of unrepeatered transmission over standard single-mode fiber (SMF-28) using several schemes of distributed Raman amplification, including first, second, and dual order. In order to further extend the transmission distance, we utilize advanced bidirectional higher-order ultra-long Raman fiber laser-based amplification, where we use fiber Bragg gratings (FBGs) to reflect Stokes-shifted light from the secondary pumps. Our work demonstrates the possibility of transmission up to 240-km span length with a total span loss of 52.7 dB. Here, we use a 28-Gbaud signal using a 64-quadrature amplitude modulation (QAM) modulation format. Our results highlight the contribution of nonlinear compensation using digital back propagation in a digital signal processor (DSP) code at the receiver.

Performance Investigation of OTDM Link at 10*4 Gbps and Link Range of 348 km Using NRZ and RZ Schemes

2019 ◽  
Vol 40 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Gaurav Soni
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Modulation Scheme ◽  
Bit Rate ◽  
Q Value ◽  
Optical Signals ◽  
Transmission Distance ◽  
Link Performance ◽  
Optical Time ◽  
Time Division

Abstract In Optical Time Division Multiplexing (OTDM)-based systems, several optical signals with low bit rate B share the same carrier frequency and are optically multiplexed to form a composite bit stream at the higher bit rate N*B, where N denotes the number of channels multiplexed. In this paper, the analysis and investigation of the performance of OTDM link are carried out with help of simulation. In this paper, OTDM link is designed based on four channels having data rate of each channel which is equal to 10 Gbps with the use of RZ and NRZ schemes being analyzed. The proposed optical link achieved maximum transmission distance of 348 km over single mode fiber. The system operated over a distance of 348 km with bit error rate of 1.39×10−31 and Q-value of 11.60 with RZ, and bit rate of 1.47×10−24 and Q-value of 10.13 with NRZ respectively. The results shows that the proposed link performance is better optimized using RZ modulation scheme in comparison to NRZ scheme. This simulation work is done in optisystem 7.0. Further in this proposed OTDM link the comparison of the link performance is also analyzed using different pulse shapes for RZ and NRZ. The results being presented in this paper are significantly taken at transmitted power of 0 dBm and 2 dBm.

LEDS AS HIGH-BIT-RATE SOURCES FOR SINGLE-MODE FIBER

Optics News ◽  
1985 ◽  
Vol 11 (12) ◽  
pp. 5 ◽  
Author(s):  
P. W. SHUMATE ◽  
M. B. ROMEISER ◽  
N. K. CHEUNG
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Bit Rate ◽  
High Bit Rate

scholarly journals Influence of Even-Order Dispersion on Super-Sech Soliton Transmission Quality under Coherent Crosstalk

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Aleksandra Panajotovic ◽  
Daniela Milovic ◽  
Anjan Biswas ◽  
Essaid Zerrad
Keyword(s):  
Fourth Order ◽  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Higher Order ◽  
Trailing Edges ◽  
Even Order ◽  
Transmission Quality ◽  
The Impact ◽  
Order Dispersion

The transmission speed of optical network strongly depends on the impact of higher order dispersion. In presence of coherent crosstalk, which cannot be otherwise controlled by optical filtering, the impact of higher order dispersions becomes more pronounced. In this paper, the general expressions, that describe pulse deformation due to second- and fourth-order dispersions in a single-mode fiber, are given. The responses for such even-order dispersions, in presence of coherent crosstalk, are characterized by waveforms with long trailing edges. The transmission quality of optical pulses, due to both individual and combined influence of second- and fourth-order dispersions, is studied in this paper. Finally, the pulse shape and eye diagrams are obtained.

Multichannel FMCW lidar for imaging velocimetry and range finding

2021 ◽  
Author(s):  
Iskander Gazizov ◽  
Sergei Zenevich ◽  
Oleg Benderov ◽  
Alexander Rodin
Keyword(s):  
Near Infrared ◽  
Moving Objects ◽  
Single Channel ◽  
Basic Research ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Time Data ◽  
Range Finding ◽  
Scan Time ◽  
Laser Control

&lt;p&gt;We present a concept of near-infrared FMCW lidar for real-time low-resolution imaging velocimetry and range finding of moving objects. One of the problems this instrument to challenge is the detection of unmanned aerial vehicles in an urban environment. The use of a lidar-based system is either in the detection of the object itself or of the wingtip vortices generated by rotating blades. A significant drawback of typical wind lidar is the long measurement time associated with the need to scan the area of &amp;#8203;&amp;#8203;interest, therefore we propose an 8x2 matrix of receivers to reduce the total scan time. The main feature of the instrument is the use of commercially available components, including DFB lasers and single-mode fiber for the optical circuit, which can significantly reduce the cost of the device, as well as development time. Data processing and laser control are handled by the FPGA. The characteristics of the multichannel lidar are estimated based on ongoing testing of the single-channel prototype.&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Acknowledgements&lt;/strong&gt;&lt;/p&gt;&lt;p&gt;This work has been supported by the Russian Foundation for Basic Research grants #19-29-06104&lt;/p&gt;

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