Power efficient Space Division Multiplexing–Wavelength Division Multiplexing system using multimode EDFA with elevated refractive index profile

Abstract

Summary Space division multiplexing (SDM) is an endowment technology to increase the collective bandwidth of multimode transmission in wavelength division multiplexing (WDM) system. In this paper, four wavelength signals from 229.6 to 232.6 THz are transmitted. For each wavelength, three linearly polarized (LP) modes are multiplexed using SDM. These 12 LP modes are transmitted through four parallel Multimode Step Index (MSI) fibers and received by four optical network units (ONUs). A multimode erbium doped fiber amplifier (MMEDFA) with elevated refractive index profile (ERIP) is used as preamplifier to this SDM–WDM system. This ERIP is complying with ITU‐T G.651.1 standard fiber in dispersion performance. The pumping power of 10 mW is adequate for this MMEDFA which is very low and cost effective. LP modes are transmitted, and performance of proposed transmission system is evaluated in terms of spatial electric fields, pumping power requirement, output optical power, and bit error rate (BER).

Fabrication and spectral properties of two-dimensional fiber gratings based on LMA fiber

“…The new fiber grating concept of two-dimensional fiber grating studied in this subject is based on the multi-wavelength filter structure in the wavelength division multiplexing system [11][12][13] and the resonator structure of the multi-wavelength laser [14][15][16][17]. The refractive index is one-dimensionally modulated, and two-dimensional fiber grating refers to fiber gratings with multiple different periods distributed on the sub-wavelength scale of the fiber core, in order to realize a new structure of compact gratings with multi-channel and multi-wavelength output.…”