Analysis of system capacity and spectral efficiency of fixed-grid network

TL;DR

This paper evaluates the capacity and spectral efficiency of a fixed-grid optical network using various modulation formats, demonstrating how different modulations impact data rates, transmission distances, and spectral efficiency.

Contribution

It introduces an analysis of fixed-grid network performance with multiple modulation formats, highlighting their capacities, spectral efficiencies, and transmission distances using digital signal processing.

Findings

Spectral efficiencies of 2, 3, and 4 bits/s/Hz for PM-QPSK, PM-8 QAM, and PM-16 QAM.

System capacities of 8-9 Tbps, 12-13.5 Tbps, and 16-18 Tbps for the respective modulations.

Transmission distances of 3000 km, 1300 km, and 700 km with acceptable BER.

Abstract

In this article, the performance of a fixed grid network is examined for various modulation formats to estimate the system's capacity and spectral efficiency. The optical In-phase Quadrature Modulator structure is used to build a fixed grid network modulation, and the homodyne detection approach is used for the receiver. Data multiplexing is accomplished using the Polarization Division Multiplexed technology. 100 Gbps, 150 Gbps, and 200 Gbps data rates are transmitted under these circumstances utilizing various modulation formats. Various pre-processing and signal recovery steps are explained by using modern digital signal processing systems. The achieved spectrum efficiencies for PM-QPSK, PM-8 QAM, and PM-16 QAM, respectively, were 2, 3, and 4 bits/s/Hz. Different modulation like PM-QPSK, PM-8-QAM, and PM-16-QAM each has system capacities of 8-9, 12-13.5, and 16-18 Tbps and it reaches transmission distances of 3000, 1300, and 700 kilometers with acceptable Bit Error Rate less than equal to 2*10-3 respectively. Peak optical power for received signal detection and full width at half maximum is noted for the different modulations under a fixed grind network.