Journal ArticleDOI
The Trade Off Between Different Modulation Schemes for Maximum Long Reach High Data Transmission Capacity Optical Orthogonal Frequency Division Multiplexing (OOFDM)
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TLDR
It is observed that multi level QAM has presented better performance than multi level PSK and finally multi level DPSK in optical OFDM systems and OSNR, SNR, and BER are improved using 4-QAM OFDM system than either QPSK or 4-DPSK.Abstract:
This paper shows the trade off between different modulation techniques such as multi level quadrature amplitude modulation, multi level phase shift keying, and multi level differential phase shift keying for upgrading direct detection optical orthogonal frequency division multiplexing systems with possible transmission distance up to 15,000 km and total bit rate of 2.56 Tb/s. The 2.56 Tb/s signal is generated by multiplexing 64 OFDM signals with 40 Gb/s for each OFDM. Variations of optical signal to noise ratio (OSNR), signal to noise ratio (SNR), and bit error rate (BER) are studied with the variations of transmission distance. Maximum radio frequency power spectrum, and output electrical power after decoder are measured for different multi level modulation techniques with carrier frequency. It is observed that multi level QAM has presented better performance than multi level PSK and finally multi level DPSK in optical OFDM systems. Maximum output power after decoder is enhanced with both 32-PSK, and 64-QAM. Quadrature signal amplitude level at encoder is upgraded with 64-QAM. It is noticed that OSNR, SNR, and BER are improved using 4-QAM OFDM system than either QPSK or 4-DPSK.read more
Citations
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Distributed Feedback Laser (DFB) for Signal Power Amplitude Level Improvement in Long Spectral Band
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TL;DR: In this paper, a distributed feedback laser for signal power amplitude level improvement in the long spectral band of 1550-nm wavelength within supporting pumped wavelength of 1480-nm was presented, where the bias and modulation peak currents were varied to test the signal power level, peak signal amplitude variations after the fiber-optic channel and light detectors.
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References
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Transmission simulation of coherent optical OFDM signals in WDM systems.
Hongchun Bao,William Shieh +1 more
TL;DR: The results show that the system Q of the WDM channels at 10 Gb/s is over 13.0 dB for a transmission up to 4800 km of standard-single-mode-fiber (SSMF) without dispersion compensation.
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Study of OFDM Technique on RoF Passive Optical Network
TL;DR: This paper investigates the use of the OFDM as a modulation technique for radio over fiber in passive optical network (PON) and the proposed system can provide a flexible, cost effective and significant high data rate.
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Performance analysis of the ofdm scheme for wireless over fiber communication link
TL;DR: This paper investigates the performance and characteristics of Orthogonal Frequency Division Multiplexing (OFDM) as a modulation technique for a ROF and modeling and simulates OFDM Radio Over Fiber scheme using latest commercial software called Optisystem.
Coherent Detection WDM Optical OFDM System
Manpreet Singh,Karamjit Kaur +1 more
TL;DR: In this paper, the phase modulator system is proposed at the receiver end to recover higher-order dispersion which would not be compensated by Dispersion compensating fiber (DCF), Optical Filters etc.
Journal ArticleDOI
Designing and Performance Evaluation of 64 QAM OFDM System
Sahasha Namdeo,Reena Rani +1 more
TL;DR: The MATLAB script based model of the 64 QAM-OFDM system with normal AWGN channel and Rayleigh fading channel has been made for study error performance and throughput under different channel conditions, which maximizes the system throughput in the presence of narrowband interference.