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A Simple Nonlinear Companding Transfrom for Nonlinear Compensation of Direct-Detection Optical OFDM Systems

Ngo Trang T., Nguyen Nhan D.

International Journal of Electronics and Telecommunications

2020

Vol. 66, No. 3

515--520

In direct-detection OFDM systems, the nonlinear effects caused by optical modulation and fiber transmission can degrade the system performance severely. In this study, we propose a new nonlinear companding transform to improve the performance of direct detection optical OFDM transmission systems. The demonstration is realized by Monte-Carlo simulation of the intensity modulation and direct detection DCO-OFDM optical transmission system at 40 Gbps over a 80 km of standard single mode fiber link. The influence of the companding parameters on the performance of system in different nonlinear transmission conditions has been investigated via simulation.

Variable-Weight Optical Code Division Multiple Access System using Different Detection Schemes

Seyedzadeh S., Moghaddasi M., Anas S. B. A.

Journal of Telecommunications and Information Technology

2016

nr 3

50--59

In this paper a Variable Weight OCDMA (VW-OCDMA) system using KS code with Direct Decoding (DD), Complementary Subtraction (CS) and AND subtraction detections is proposed. System performance is analyzed using mathematical approximation and software simulation. In mathematical analysis, the eects of Phase-Induced Intensity Noise, shot noise and thermal noise are taken into account. Bit Error Rate of dierent users is plotted as a function of received optical power per chip with varying the bit rates and number of active users. It has been shown that for dierent bit rates and number of users, system using DD has better performance than the system applying CS and AND detection. Using DD scheme, the number of active users are 100 while this value is 27 and 25 in case of using CS and AND detection, respectively, when the received optical power per chip is -10 dBm.

Metody detekcji promieniowania optycznego

Bielecki Z.

Elektronika : konstrukcje, technologie, zastosowania

2004

Vol. 45, nr 12

19-28

W artykule omówiono zagadnienia dotyczące detekcji promieniowania optycznego, a szczególnie: układy detekcji bezpośredniej, zaawansowane sposoby detekcji promieniowania optycznego, układy odczytu stosowane w nowej generacji matryc detektorów.

A review detection method of optical radiation is presented. Direct detection systems, advanced methods of optical detection and readout electronics for new generation arrays are presented.