Intra-Cavity Chromatic Dispersion Impacts on 10-Gb/s Optical OFDM Transmissions Over 25-km Dual-RSOA-Based Self-Seeded PON Systems

Abstract

Owing to the lack of strong physical mechanisms capable of elaborately balancing a large number of longitudinal modes created in a self-seeded passive optical network (PON), the resulting coherent-like optical signals are vulnerable to frequencydependent optical phenomena such as chromatic dispersion (CD). In this paper, based on our recently reported real-time dual-reflective semiconductor optical amplifier (RSOA)-based self-seeded adaptive optical orthogonal frequency-division multiplexing (OOFDM) transmitters, detailed experimental explorations are undertaken, for the first time, of the impacts of intra-cavity CD on 10-Gb/s OOFDM transmissions over 25-km self-seeded PON systems. The cavity length-dependent intra-cavity CD effect is identified to be one of the most prominent physical mechanisms determining the practically achievable performance of such PON systems. In comparison with a 10-m-long dual-RSOA self-seeded fiber cavity, the accumulated intra-cavity CD effect associated with a 1-km-long dual-RSOA self-seeded fiber cavity not only considerably broadens the optical spectral width of the self-seeding-created coherent-like optical signal but increases the signal relative intensity noise (RIN) by 4.8 dB (at a 2-GHz signal spectral region) as well. In addition, a further 1.1-dB signal RIN growth is also measured after the 25-km single-mode fiber (SMF) PON system transmissions. As a direct result, the dual-RSOA self-seeded PON with a 1-km-long fiber cavity suffers from a 2.2-dB power penalty degradation for 10 Gb/s over 25-km SMF intensity modulation and direct detection OOFDM transmissions.

Enhanced Amplitude Noise Tolerance of a Self-Seeded RSOA Laser Using Balanced Detection

“…The resulting large number of longitudinal modes induces high relative intensity noise (RIN) dominated by mode beating after detection, which can become the main limiting factor for transmission, notably under the effect of chromatic dispersion [4,5,7].…”

Asymmetric peak to average power ratio impacts on direct‐detected optical OFDM transmission link

“…For these reasons, numerical analysis of SWG is an essential step for a project. In this context, to study the SWG characteristics various methods have been applied, some of them based on FDTD [2,5], Fourier Eigenmode Expansion Method [6], and 2D finite element method (FEM) [7]. In this article, a novel 3D vector FEM for analysis of eigenvalue problems for periodic structures is presented.…”

“…The performance of the direct detection optical OFDM transmission degrades with various nonlinear optical effects caused by a chromatic dispersion (CD). It has been reported that the CD entails two main optical phenomena as follows . First, An ISI and inter‐carrier interference (ICI) are generated due to the overlap between two OFDM symbols caused by the CD.…”