Design of Multichannel Optical OFDM System Using Advanced Modulation Techniques

Abstract

Existing single-channel orthogonal frequency division multiplexing (OFDM) system can transmit data from single source to single destination occupying the entire link but bit error rate (BER) provided by these systems is quite high. The multichannel system gives the liberty to route the traffic through the different channels depending upon the availability. So there is a need to design a multichannel system which can transmit the data at higher rate by transmitting multiple symbols simultaneously with improved BER. So, in this research work, we propose a multichannel OFDM system by using an advanced modulation technique, i. e. quadrature amplitude modulation which not only improves the capacity but also makes the system power efficient. In order to demonstrate that our proposed system is power efficient, a set of simulations have been performed. Results show that BER (as a function of power) obtained for the proposed system is low in comparison to the already existed phase shifting keying- and differential phase shift keying-based system.

A 500 km Long Transmission with Coherent Optical OFDM Using Dual Polarization Quadrature Phase Shift Keying (QPSK) and Double Sideband Suppressed‐Enhanced Carrier (DSS‐EC)

“…The ultimate solution for high spectral efficiency was observed by using different advanced modulations in coherent multilevel modulation systems and offers multiple bits per second per hertz. [4,5] Direct and balanced detection in one bandwidth-efficient modulation is seen in orthogonal frequency division multiplexing (OFDM) systems and is popular for long-haul communication systems. [3] Digital coherent receivers for different polarizations and phases can significantly increase the capacity of optical fiber communication systems and this is due to the use of two states of orthogonal polarizations, of in-phase and quadraturephase components.…”

“…The ultimate solution for high spectral efficiency was observed by using different advanced modulations in coherent multilevel modulation systems and offers multiple bits per second per hertz. [ 4,5 ] Direct and balanced detection in one bandwidth‐efficient modulation is seen in orthogonal frequency division multiplexing (OFDM) systems and is popular for long‐haul communication systems. [ 3 ]…”