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 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.