scholarly journals Joint Encryption Scheme Based on the Chaotic DCT Matrix and SLM Algorithm in an OFDM-PON System

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Shuai Zhang ◽  
Liqun Huang ◽  
Mingxu Zhu
Keyword(s):  
Data Transmission ◽  
Orthogonal Frequency Division Multiplexing ◽  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Passive Optical Network ◽  
Encryption Scheme ◽  
Chaotic Mapping ◽  
Data Transmission Security ◽  
Selective Mapping

In order to effectively solve the problem of data transmission security and peak-to-average ratio (PAPR) in an orthogonal frequency division multiplexing passive optical network (OFDM-PON) transmission system, in this paper, a joint encryption scheme of discrete cosine transform (DCT) and selective mapping (SLM) based on chaotic mapping is proposed. In this scheme, the chaotic sequence of a 3D Lorenz chaotic system is used as the row and column index of the DCT matrix and the phase factor of SLM to resist selective plaintext attack, and the system encryption is realized while reducing PAPR. The theoretical analysis and numerical simulation show that the common OFDM-PON, the proposed algorithm, can obtain a PAPR suppression gain of ∼4.8 dB and improve the receiver sensitivity by ∼4 dB BER @ 10 − 3 . In addition, it shows that, with the increase of row/column index mismatch of the DCT matrix, the bit error rate of the system increases gradually. An encrypted data transmission of 8 GB/s 16-QAM optical OFDM signals is successfully simulated over a 20 km standard single-mode fiber, which proves the excellent confidentiality of the proposed secure transmission.

Long-Reach Transmission Characteristics of Tunable External Cavity Laser

2015 ◽  
Vol 15 (10) ◽  
pp. 7462-7466
Author(s):  
Su Hwan Oh ◽  
Ki-Hong Yoon ◽  
Seung-Hyun Cho ◽  
Jun-Kyu Seo
Keyword(s):  
Tuning Range ◽  
Optical Network ◽  
External Cavity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Bragg Reflector ◽  
Passive Optical Network ◽  
Lasing Spectrum ◽  
External Cavity Laser ◽  
Cavity Laser

We report the transmission capability of a tunable external cavity laser (T-ECL) that utilizes a super-luminescent diode (SLD) and a polymer Bragg reflector (PBR) operating with a direct modulation of 2.5 Gb/s for a light source of a long-reach wavelength division multiplexed-passive optical network (WDM-PON). The T-ECL successfully operated at an ambient temperature of −20 °C to 70 °C when employing a cooled SLD. A tuning range of 12-nm is achieved with a tuning power of lower than 80 mW. A side mode suppression ratio of more than 35 dB was obtained for the whole tuning range. The linewidth of the lasing spectrum is less than 0.1 nm at 20 dB from the peak power. The transmission performance of the T-ECL, including an optical bandpass filter (OBPF), is better than that of the T-ECL excluding an OBPF for a long-reach transmission over 80 km of single mode fiber (SMF). The power penalty of the T-ECL is less than 1.4 dB when using an OBPF for an 80-km transmission.

scholarly journals A Viable Passive Optical Network Design for Ultrahigh Definition TV Distribution

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Shahab Ahmad Niazi ◽  
Xiaoguang Zhang ◽  
Lixia Xi ◽  
Abid Munir ◽  
Muhammad Idrees ◽  
...  
Keyword(s):  
Optical Network ◽  
High Capacity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Passive Optical Network ◽  
High Definition ◽  
International Telecommunication Union ◽  
Single Carrier ◽  
Optical Network Design ◽  
High Definition Tv

International Telecommunication Union (ITU) has recently standardized ultrahigh definition television (UHD-TV) with a resolution 16 times more than the current high definition TV. An increase in the efficiency of video source coding or in the capacity of transmission channels will be needed to deliver such programs by passive optical network (PON). In this paper, a high capacity integrated PON infrastructure is proposed to overlay ultrahigh definition television by a complete passive coexistence of 10G-PON (XG-PON) and single carrier directly modulated, duo-binary 40G-PON (XLG-PON) signal. The simulation results show error-free transmission performance and further distribution to 32 optical network units (ONUs) on broadcast basis with negligible power penalty over 20 km of bidirectional standard single mode fiber.

An ultra-dense spacing-based PON by incorporating dual drive Mach–Zehnder modulator for comb generation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Navjot Singh ◽  
Bharat Naresh Bansal
Keyword(s):  
Optical Networks ◽  
High Speed ◽  
Low Cost ◽  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Passive Optical Network ◽  
Passive Optical Networks ◽  
Differential Phase Shift ◽  
High Data

Abstract Wavelength division multiplexed passive optical is promising technique to achieve a high data rate and large number of user. The notable advantages of WDM PON is the combination of reliability, cheap in cost, accessible bandwidth, high security, large optical reach and it can support large number of ONU. There are multiple approaches to achieve high-speed WDN PON using different transmission techniques. In WDM, multiple lasers are required which increase the cost of the system. To reduce cost, an optical multicarrier generation system is proposed. An economical multiple carrier generation with the incorporation of sine generator and Mach–Zehndar modulator is demonstrated. Utmost work of sine generator and dual drive modulator was to attain low cost functioning of passive optical networks. Multicarrier generation was done and replacement of laser carriers with optical multicarrier generator. Carriers were generated with the frequency spacing of 20 GHz and these carriers were used in the passive optical networks with the tone-to-noise ratio of 40 dB, amplitude difference of 1.4 dB. For the transmission of downstream in the PON, differential phase shift keying was employed at 10 Gbps data speed. Transmission distance achieved was 30 km using single-mode fiber and this was a part of optical distribution network. Optical network unit was next part after ODN and signals were received with balanced receiver. Moreover, half signal was given to intensity modulator for the signal re-modulation. Bit error rate of 10–9 was achieved at all channels in the downstream. An upstream of 10 Gbps was accomplished in the passive optical network.

Performance Analysis of 4×10 Gbps OFDM-PON System Over ROF Link

2019 ◽  
Vol 40 (2) ◽  
pp. 113-117 ◽  
Author(s):  
Anjali Koundal ◽  
Sanjeev Dewra
Keyword(s):  
Quality Factor ◽  
Bit Error Rate ◽  
Error Rate ◽  
Orthogonal Frequency Division Multiplexing ◽  
Optical Network ◽  
Single Mode ◽  
Input Power ◽  
Passive Optical Network ◽  
Laser Source ◽  
Bit Rate

Abstract In this paper, an OFDM-ROF-PON transmission system at bit rate of 4×10 Gbps is proposed and demonstrated. This paper analyzes orthogonal frequency division multiplexing system for radio over fiber in passive optical network at different input powers. A laser source of 193.1 THz is used with single mode fibers of length 400 km and 500 km. A transmission bit rate of 10 Gbits/sec is used to simulate the OFDM-ROF-PON system. The performance of the system has been analyzed with acceptable Quality Factor and Bit Error Rate at low signal input power in the presence of fiber non-linearities. Also the system does not use any amplifiers and the work is done at higher bit rates. It is analyzed that as the input power increases quality factor also increases and bit error rate decreases.

scholarly journals Performance Enhancement and Capacity Enlargement for a DWDM-PON System Utilizing an Optimized Cross Seeding Rayleigh Backscattering Design

2019 ◽  
Vol 9 (21) ◽  
pp. 4520 ◽  
Author(s):  
Mohammed ◽  
Hamdi Mansi
Keyword(s):  
Wavelength Division Multiplexing ◽  
Performance Enhancement ◽  
Optical Network ◽  
High Capacity ◽  
Evaluation Process ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Passive Optical Network ◽  
Rayleigh Backscattering ◽  
The Cross

In this work, a record of 16 channels, with future channel spacing in the telecommunication standardization sector of the International Telecommunications Union G.694.1 (ITU-T G.694.1) for Dense Wavelength Division Multiplexing (DWDM) (i.e., 12.5 GHz), is simulated and tested. This work is done to realize a proposed high capacity DWDM-Passive Optical Network (DWDM-PON) system. These specifications are associated with enhancing the upstream (US) capacity to 2.5 Gb/s over a 25 km Single-Mode Fiber (SMF) transmission and producing a noteworthy average Bit Error Rate (BER) of 10−12 during the system’s evaluation process. These performance indicators are achieved through design optimization of the cross-seeding Rayleigh Backscattering (RB) elimination technique. This optimization has successfully reduced (compared to the cross-seeding related literature) the simulated DWDM-PON components and maintained an effective Rayleigh Backscattering elimination with the aforementioned system’s performance enhancement and capacity enlargement.

RSOA-Based Full-Duplex WDM-PON for 20 Gbps Transmission in Two Channels Over a Long-Haul SMF Using External Modulation Scheme

2015 ◽  
Vol 36 (3) ◽  
Author(s):  
Anindya Sundar Das ◽  
Ardhendu Sekhar Patra
Keyword(s):  
Optical Network ◽  
Single Mode ◽  
Optical Amplifier ◽  
Single Mode Fiber ◽  
Passive Optical Network ◽  
Full Duplex ◽  
Modulation Scheme ◽  
Wavelength Division ◽  
External Modulation ◽  
Wdm Pon

AbstractWe have proposed and demonstrated a full-duplex wavelength division multiplexed passive optical network (WDM-PON) configuration based on reflective semiconductor optical amplifier (RSOA). RSOA is used for reusing and remodulate the downlink signal in the uplink. We have used external modulation scheme for transmitting 20 Gbps data rates in two channels over a 40 km single mode fiber (SMF). The uplink and the downlink performances are checked by the bit error rate (BER) and the eye diagrams.

scholarly journals 25 Gb/s Data Transmission Using a Directly Modulated InGaAlAs DBR Laser over 14 nm Wavelength Tuning Range

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 84
Author(s):  
Daibing Zhou ◽  
Yiming He ◽  
Dan Lu ◽  
Song Liang ◽  
Lingjuan Zhao ◽  
...  
Keyword(s):  
Mobile Networks ◽  
Data Transmission ◽  
Tuning Range ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Bragg Reflector ◽  
Wavelength Tuning ◽  
Passive Optical Network ◽  
Light Sources ◽  
Distributed Bragg Reflector

With the deployment of the fifth generation of mobile networks (5G), 25 and 100 Gb/s directly modulated lasers and modules will become the mainstream optical transmitters. A directly modulated InGaAlAs/InP distributed Bragg reflector (DBR) laser is fabricated by butt-joint technology. A 25 Gb/s data transmission over a single-mode fiber of up to 10 km is demonstrated, and a wavelength tuning range of 14.28 nm is achieved through injection current tuning of a DBR section and temperature control of a thermoelectric cooler (TEC), which is the best candidate of colorless light sources for wavelength-division-multiplexed passive optical network (WDM-PON) systems.

20 Gbps Bidirectional Transmission via Four Channels over Long-haul SMF in a WDM-PON Architecture using External Modulation Scheme

2017 ◽  
Vol 38 (2) ◽  
Author(s):  
Anindya Sundar Das ◽  
Ardhendu Sekhar Patra
Keyword(s):  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Passive Optical Network ◽  
Modulation Scheme ◽  
Wavelength Division ◽  
Wavelength Division Multiplexed ◽  
External Modulation ◽  
Data Rates ◽  
High Bandwidth

AbstractA novel architecture of bidirectional gigabit signal transport system over long-haul single-mode fiber (SMF) using wavelength division multiplexed passive optical network technique is proposed and demonstrated. In order to offer multimedia services of high bandwidth, four signals of 5 Gbps data rates are externally modulated and transmitted through four channels over 100-km SMF in uplink and downlink. In our proposed scheme, an excellent bit error rate, good

scholarly journals Polarization Division Multiplexing of OFDM Radio-over-Fiber Signals in Passive Optical Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Maria Morant ◽  
Joaquin Pérez ◽  
Roberto Llorente
Keyword(s):  
Optical Networks ◽  
Spectral Efficiency ◽  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Radio Over Fiber ◽  
Passive Optical Network ◽  
Passive Optical Networks ◽  
The Impact ◽  
Polarization Division Multiplexing

This paper describes the state-of-the-art of polarization multiplexing for optical networks transmission. The use of polarization division multiplexing (PDM) permits to multiply the user capacity and increase the spectral efficiency. Combining PDM and orthogonal frequency division multiplexed (OFDM) modulation allows maximizing the optical transmission capacity. The experimental demonstration of transmitting OFDM signals following ECMA-368 ultrawide band (UWB) standard in radio-over-fiber using PDM in passive optical networks is herein reported. The impact of cross-polarization and cochannel crosstalk is evaluated experimentally in a three-user OFDM-UWB subcarrier multiplexed (SCM) configuration per polarization. Each SCM uses up to three OFDM-UWB channels of 200 Mbit/s each, achieving an aggregated bitrate of 1.2 Gbit/s with 0.76 bit/s/Hz spectral efficiency when using PDM transmission. The experimental results for the polarization-multiplexed SCM indicate that a 4 dB additional polarization crosstalk interference can be expected compared to a nonpolarization-multiplexed transmission system which translates to 2.4 dB EVM penalty in the UWB signals. The successful PDM transmission of SCM multiuser OFDM-UWB over a passive optical network of 25 km standard-single mode fiber (SSMF) reach is demonstrated.

FBMC-based dispersion compensation using artificial neural network equalization for long reach-passive optical network

2019 ◽  
Vol 18 (01) ◽  
pp. 1941011
Author(s):  
L. Jerart Julus ◽  
D. Manimegalai ◽  
S. Sibi Chakkaravarthy
Keyword(s):  
Optical Networks ◽  
Direct Detection ◽  
Dispersion Compensation ◽  
Chromatic Dispersion ◽  
Optical Network ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Passive Optical Network ◽  
Filter Bank Multicarrier ◽  
Artificial Neural

This paper presents a Filter Bank Multicarrier (FBMC), a viable waveform candidate for fifth generation (5G) communications using Staggered-Modulated Multitone (SMT). FBMC is preferred in optical communication because of its ability to work without Cyclic Prefix (CP). In any case, the operation of FBMC in optical access systems with Artificial Neural Networks (ANNs) has not been broadly explored either downstream or upstream. This work presents an advanced Nonlinear Feed-Forward Equalizer (NFFE) that makes use of multilayer ANN for dispersion compensation. ANN is trained to act as a filter with an extensive equalizer training which has the ability to mitigate dispersion and increase the performance of the system. The simulation work is used to study the performance of intensity modulated FBMC system with direct detection in Long Reach-Passive Optical Networks (LR-PONs).The transmission data rate is varied between 8 and 10[Formula: see text]Gbps with the optical fiber length from 30 to 90[Formula: see text]km of Standard Single Mode Fiber (SSMF). The obtained result suggests that FBMC system with ANN-NFFE equalizer fundamentally builds the resilience to the Chromatic Dispersion (CD) distortion, and a CP-less transmission is possible upto 90[Formula: see text]km.

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