Analysis of signed chromatic dispersion monitoring by waveform asymmetry for differentially-coherent phase-modulated systems

Abstract

Abstract:We analytically study received waveform asymmetries induced by chromatic dispersion (CD) for signed CD monitoring in differential quadrature phase-shift keying (DQPSK) systems and show that the asymmetries are results of differential detection and the ±π/4 phase shifters used in conventional DQPSK receivers. The theoretical insights developed help explain various published results on signed CD monitoring based on waveform asymmetries and allow us to further propose signed CD monitoring for differential eight phase-shift keying (D8PSK) systems without any modification to the receiver. Simulation results also show that the CD-induced waveform asymmetric features are preserved in presence of self-phase modulation (SPM) and polarization-mode dispersion (PMD).

Modulation format identification in heterogeneous fiber-optic networks using artificial neural networks

“…Some of these techniques have demonstrated monitoring of multiple modulation formats and data rates and hence are suitable for OPM in heterogeneous fiber-optic networks. However, these techniques assume either a prior knowledge of the signal modulation format and data rate or the attainment of this information from the network management system [6][7][8][9][10][11][12][13][14][15][16]. In [17], a technique for the identification of data rates is proposed using asynchronous delay-tap sampling for a few modulation formats types.…”

Optical Performance Monitoring: A Review of Current and Future Technologies

“…Asynchronous sampling-based techniques for e.g. asynchronous amplitude histograms (AAHs) [21]- [28], asynchronous delay-tap plots (ADTPs) [29]- [38], asynchronous two-tap plots (ATTPs) [39], [40], and asynchronous single channel sampling (ASCS) [41], are considered attractive since they do not require clock information and they are also capable of monitoring multiple impairments simultaneously, thus being cost-effective.…”

“…ADTS-based monitoring techniques are quite interesting since they offer the potential for data rate and modulation format independent multi-impairment monitoring [29]- [38]. Like AAH, ADTS-based techniques also exploit the statistical properties of the asynchronously sampled signal.…”