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Investigation of phase-shift keying and quadrature amplitude modulation formats in wavelength division multiplexing system | IEEE Conference Publication | IEEE Xplore

Investigation of phase-shift keying and quadrature amplitude modulation formats in wavelength division multiplexing system


Abstract:

Nowadays increase of data transmission leads to the improving optical communication and data systems. One of the challenges are how effectively utilize bandwidth of the t...Show More

Abstract:

Nowadays increase of data transmission leads to the improving optical communication and data systems. One of the challenges are how effectively utilize bandwidth of the transmission media. Wavelength division multiplexing is common used method of multiplexing to create high-speed full-optical networks. Increase of transmission capacity can be achieved by using high-order modulation formats. This paper deals with comparison of bit error rate for the same symbol rate of phase-shift keying and quadrature amplitude modulation technique. The VPIphotonic software was used as a simulation tool. The simulation results show, how high-order modulation formats can increase the transmission capacity and allow better adaptation of transmission signal to transmission channel. Results shows, that quadrature amplitude modulation has better performance in comparison with on/off keying and phase-shift keying modulation.
Date of Conference: 19-20 April 2016
Date Added to IEEE Xplore: 26 May 2016
ISBN Information:
Conference Location: Kosice, Slovakia

1. Introduction

In the general sense the modulation technique allows coding to prevent transmission errors from occurring (‘line coding’) or to correct for already occurred transmission errors (‘error correcting coding’) [1]. By reaching transmission rate 40 Gb/s with utilizing of on-off keying modulation format at the turn of the millennium, optical high-order modulation formats and coding became very important. The steadily growing demands for capacity in fiber-optic communication networks forcing use new techniques which utilize more efficient the available bandwidth in optical fibers. High-order modulation formats have attracted much interest since they allow increased spectral efficiencies by encoding multiple bits per one transmitted symbol [1], [2]. Higher optical transmission capacity can be achieved by using high-order modulation formats, without deployment of new optical fibers. Generally, the implementation of high-order modulation formats in fiber optic transmission systems is very significant goal for the next generation of communication systems [3], [4]. The experimentally demonstrated record for the aggregate capacity over a single optical fiber is currently at 25.6 Tb/s transmission over 240 km using 160 WDM (wavelength division multiplex) channels on a 50 GHz grid in the C+L bands. Every channel contains two polarization-multiplexed 85.4 Gbit/s RZ-DQPSK (return-to-zero differential quadrature phase-shift keying) signals, yielding a spectral efficiency of 3.2 b/s/Hz in each wavelength [1].

References

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