Comparison Of Lightwave System Performance Using Single-Mode Silica (1.55 µm) & Fluoride Fibers (2.55 µm) With Direct And Coherent Detection

1990 ◽  
Author(s):  
Harish R. D. Sunak ◽  
Clark P. Engert ◽  
Kriengrai Tintasuwan
Keyword(s):  
System Performance ◽  
Single Mode ◽  
Coherent Detection

scholarly journals Enhanced Spectral Amplitude Coding OCDMA System Utilizing a Single Photodiode Detection

2018 ◽  
Vol 8 (10) ◽  
pp. 1861 ◽  
Author(s):  
Somia Abd El-Mottaleb ◽  
Heba Fayed ◽  
Ahmed Abd El-Aziz ◽  
Mohamed Metawee ◽  
Moustafa Aly
Keyword(s):  
System Performance ◽  
Multiple Access ◽  
Group Velocity Dispersion ◽  
Single Mode ◽  
Fiber Amplifier ◽  
Single Mode Fiber ◽  
Spectral Amplitude ◽  
Erbium Doped Fiber Amplifier ◽  
Spectral Amplitude Coding ◽  
Code Division Multiple

In this paper, the performance of a spectral amplitude coding-optical code division multiple access (SAC-OCDMA) system is investigated utilizing a single photodiode (SPD) detection technique. The proposed system uses enhanced double weight (EDW) codes as signature codes with three simultaneous users to overcome both phase-induced intensity noise (PIIN) and multiple access interference (MAI). In addition, a dispersion compensating fiber (DCF) is used in order to decrease the group velocity dispersion (GVD) caused in the single mode fiber. An erbium-doped fiber amplifier (EDFA) is used to overcome the attenuation. The use of both DCF and EDFA leads to an appreciable enhancement in the system performance. The system performance is evaluated through its bit error rate (BER), Q-factor, and received power. A comparison between the EDW codes and modified double weight (MDW) codes on the SAC-OCDMA system is demonstrated. Simulation is carried out through Optisystem ver. 7. The simulation results show that: (a) using an avalanche photodiode (APD) over PIN photodiode allows data transmission over longer distances; (b) the use of DCF improves the system BER;(c) using MDW codes gives better BER than using EDW codes.

scholarly journals Distributed Fiber Birefringence Measurement Using Pulse-Compression Φ-OTDR

2020 ◽  
Author(s):  
Yongxiang Chen ◽  
Yun Fu ◽  
Ji Xiong ◽  
Zinan Wang
Keyword(s):  
Spatial Resolution ◽  
Pulse Compression ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Time Domain Reflectometry ◽  
Coherent Detection ◽  
Compression Phase ◽  
Optical Time Domain Reflectometry ◽  
Fiber Birefringence ◽  
Optical Time

Abstract In this paper, a novel birefringence measurement method through the Rayleigh backscattered lightwave within single-mode fiber is proposed, using a single chirped-pulse with arbitrary state of polarization. Numerical analysis is carried out in detail, then pulse-compression phase-sensitive optical time domain reflectometry (PC-Φ-OTDR) with polarization-diverse coherent detection is employed to verify this method. A 2km spun single-mode fiber is tested with 8.6 cm spatial resolution, and the average birefringence of the fiber under test is measured as 0.234rad/m, which is consistent with previous literatures about single-mode fiber. Moreover, the relationship between the measured birefringence and the spatial resolution is also studied for the first time, and the results show that spatial resolution is crucial for fiber birefringence measurement.

Performance Comparison of LS and LMMSE Channel Estimation Algorithm for CO-OFDM System

2011 ◽  
Vol 130-134 ◽  
pp. 2965-2968
Author(s):  
Zheng Rong Tong ◽  
Min Jie Guo ◽  
Xiu Feng Yang ◽  
Wei Hua Zhang
Keyword(s):  
Optical Fiber ◽  
Bit Error Rate ◽  
System Performance ◽  
Single Mode ◽  
Estimation Algorithm ◽  
Performance Comparison ◽  
Ofdm System ◽  
Fiber System ◽  
Single Mode Optical Fiber ◽  
Simulation Results

The CO-OFDM single-mode optical fiber system is constructed by the Matlab coupled with the Optisystem. And the influence of different channel algorithm on the receiver of system is researched. The simulation results show that the system performance is improved by using LS or LMMSE channel algorithm. And the LMMSE channel algorithm can provide better performance than the LS channel algorithm. Compared with LS algorithm, the required receiver OSNR is reduced by about 1 dB using improved LMMSE algorithm at bit-error-rate (BER) =10-4 in the CO-OFDM single-mode optical fiber system.

Investigation on Chirping induced performance degradation in Single Mode Directly modulated 1.55um DFB laser

2019 ◽  
Vol 40 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Abida Yousuf ◽  
Hakim Najeeb-ud-din
Keyword(s):  
System Performance ◽  
Single Mode ◽  
High Gain ◽  
Rate Equations ◽  
Gain Compression ◽  
Eye Diagram ◽  
Single Mode Laser ◽  
Propagation Regime ◽  
System Output ◽  
Anomalous Propagation

Abstract Dynamic characteristics of directly modulated laser are investigated by simulating the single mode laser rate equations, emphasized on the effect of the gain compression for the two laser models: one adiabatic chirp dominated and another with a combination of adiabatic and transient chirp-dominated laser. The influence of laser adiabatic and transient chirp on system performance in normal and anomalous propagation regime is investigated by simulation. It is shown that in the anomalous propagation regime, the presence of fiber nonlinearity can be beneficial, improving the system performance by opening the eye diagram at system output. Contrarily, in the normal propagation regime, presence of high gain compression coefficient (ε > 4 × 10–17 cm3) can strongly degrade the system performance by closing the eye diagram at system output. Finally, it is shown that the laser model with a combination of adiabatic and transient chirp with anomalous dispersion coefficient shows much better result in the saturated regime. This can be used to extend the transmission distance in optical communication.

Characterization of Electrostriction Nonlinearity in a Standard Single-Mode Fiber Based on Coherent Detection and Cross-Phase Modulation

2015 ◽  
Vol 33 (22) ◽  
pp. 4547-4553 ◽  
Author(s):  
Rongqing Hui ◽  
Charles Laperle ◽  
Michael Reimer ◽  
Andrew D. Shiner ◽  
Maurice OSullivan
Keyword(s):  
Phase Modulation ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Coherent Detection ◽  
Cross Phase Modulation
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