OFDM-PON System Research Articles

Efficient Pipeline Conflict Resolution for Layered QC-LDPC Decoders in OFDM-PON

Efficient Pipeline Conflict Resolution for Layered QC-LDPC Decoders in OFDM-PON

Chaotic Dynamical Enhanced Optical Physical Layer Encryption in OFDM-PON System Based on Echo State Network

Chaotic Dynamical Enhanced Optical Physical Layer Encryption in OFDM-PON System Based on Echo State Network

Study on Digital TV Broadcasting Signals Transmission over OFDM(A) PON System Supporting Radio-over-Fiber

Study on Digital TV Broadcasting Signals Transmission over OFDM(A) PON System Supporting Radio-over-Fiber

OFDM-PON系统中基于信道相位信息的动态加密方案

OFDM-PON系统中基于信道相位信息的动态加密方案

Optical power budget enhancement in next-generation DDO-OFDM-based optical access networks using square root module

A passive optical network based on orthogonal frequency division multiplexing (OFDM-PON) gives improved performance for high speed optical access network due to its greater resistance to fiber dispersion and higher bandwidth efficiency. In optical fiber communication, chromatic dispersion (CD) is a linear distortion in fiber, but it is converted into nonlinear distortion due to square-law characteristic of photo diode detector at the receiver side resulting in degradation of performance. To compensate for this nonlinear distortion, we proposed to use a linearized receiver circuit with square root module (SRM) device which can improve the performance of system in terms of CD tolerance. In this paper, we have analytically analyzed the performance of OFDM-PON system with and without SRM device for direct-detection optical OFDM-PON (DDO-OFDM-PON) system. At BER of $$10^{-3}$$10-3, which is the limit of forward error correction, there is 11.1 and 13.5 dB improvement in optical budget with SRM for downstream and upstream direction, respectively, as compared to conventional DDO-OFDM-PON system.

Enhanced Secure Strategy for OFDM-PON System by Using Hyperchaotic System and Fractional Fourier Transformation

We propose and experimentally demonstrate a scheme whereby hyperchaos and fractional Fourier transform (FrFT) techniques are integrated in an orthogonal frequency-division multiplexing (OFDM) passive optical network system. In our experiment, both security issues and transmission performance are investigated under an overall frame, and 7.64-Gb/s 16-quadrature-amplitude-modulation OFDM data with a four-level encryption scheme are successfully transmitted over a 25-km standard single-mode fiber. The results show that the system security and the transmission performance can be improved simultaneously. Moreover, the proposed scheme allows a flexible adjustment between the safety and the transmission performance according to the actual requirements.

Optical OFDM for Downstream Transmission in Long-Reach PON

Orthogonal Frequency Division Multiplexing (OFDM) has gained great attention in the next generation Long-Reach Passive Optical Network (LR-PON) due to its high spectrum efficiency, flexible resource allocation and natural compatibility with Digital Signal Processing (DSP)-based implementation. In this paper, we propose and demonstrate a 40Gbit/s direct-detection long reach OFDM-PON system for downstream transmission over 100km standard signal mode fiber (SSMF). By using a simple Least Square (LS) method for the channel estimation, our proposed system achieves high bit rate without the need for chromatic dispersion compensation.

Allocation Scheme of Short Training Sequence Based on OFDM-PON

A new structure of short training sequence for symbol synchronization in OFDM-PON system is proposed in this paper. By adjusting the subcarrier allocation scheme of short training sequence in a wireless LAN, it makes the mean of short training sequence signal in time domain from non-zero to zero mean and solves the receiving data demodulation interference caused by the wrong trail of the non-zero mean short training sequence in time-domain. Data demodulation simulation and experimental results show that the improved method can effectively reduce the training sequence interference errors caused by tailing.

40Gbps OFDM PON系统采用偏振复用技术实现上行链路传输

40Gbps OFDM PON系统采用偏振复用技术实现上行链路传输

Direct-detection optical OFDM superchannel for long-reach PON using pilot regeneration

We demonstrate a novel long-reach PON downstream scheme based on the regenerated pilot assisted direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) superchannel transmission. We use the optical comb source to form DDO-OFDM superchannel, and reserve the center carrier as a seed pilot. The seed pilot is further tracked and reused to generate multiple optical carriers at the local exchange. Each regenerated pilot carrier is selected to beat with an adjacent OFDM sub-band at ONU, so that the electrical bandwidth limitation can be much released compared to the conventional DDO-OFDM superchannel detection. With the proposed proof-of-concept architecture, we experimentally demonstrated a 116.7 Gb/s superchannel OFDM-PON system with transmission reach of 100 km, and 1:64 splitting ratio. We analyze the impact of carrier-to-sideband power ratio (CSPR) on system performance. The experiment result shows that, 5 dB power margin is still remained at ONU using such technique.

The Performance of Synchronization Algorithm in Real-time OFDM—PON System

In OFDM-PON system, the synchronization signal is very important. We use synchronization signal to get a whole OFDM signal. Due to the real-time system, we need to get the fast change signal. So get a true signal is very important and very hard. That is to say, we need to design an excellent algorithm to get finish this demand. This is another point of this project. In the paper, the author designed a new algorithm to solve the problems. we use some simulations to compare the performances of different algorithms to get the further understanding. In the experiment, we use more detail algorithms to estimate if it is useful in real-time OFDM-PON system. When the SNR is 10, we can get the synchronization signal correctly. DOI: http://dx.doi.org/10.11591/telkomnika.v10i7.1576 Full Text: PDF

Demonstration and Performance Analysis of ROF Based OFDM-PON System for Next-Generation Faber Optic Communication

Demonstration and Performance Analysis of ROF Based OFDM-PON System for Next-Generation Faber Optic Communication