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Abstract
The recent introduction of optical OFDM and spatial MIMO techniques has led to considerable increases in spectral efficiency and aggregate throughput for future optical networks. However, these spatial and spectral domains can also be exploited for next-generation elastic optical networking. In this paper, we introduce the first hierarchy for dynamic multidimensional spatial and spectral optical networking and complement it with adaptive coded-modulation to form the basis of a novel elastic networking concept.
Highlights
IntroductionThe need to establish lightpaths (optical connection between two entities) in arbitrary directions, and switch them on-demand has led to the adoption of photonic routing devices mostly in the form of reconfigurable optical add-drop multiplexers (ROADM), and photonic crossconnects (PXC) [1]
In current optical networks, the need to establish lightpaths in arbitrary directions, and switch them on-demand has led to the adoption of photonic routing devices mostly in the form of reconfigurable optical add-drop multiplexers (ROADM), and photonic crossconnects (PXC) [1]
With the introduction of optical orthogonal frequency division multiplexing (OFDM) [4], or Nyquist-based pulse generation [5], novel frequency-domain degrees of freedom have been added to optical transmission
Summary
The need to establish lightpaths (optical connection between two entities) in arbitrary directions, and switch them on-demand has led to the adoption of photonic routing devices mostly in the form of reconfigurable optical add-drop multiplexers (ROADM), and photonic crossconnects (PXC) [1]. While previous work has considered physical-layer benefits of spatial mode (multimode and multicore) fiber transmission, to the best of our knowledge, no previous analysis exists on exploiting this spatial dimension for optical networking (i.e. switching and routing.) The spatial multiplexing domain (i.e. the use of multiple fiber core and/or spatial modes) emerges as a novel and appealing networking tool. Spectral arrangements within individual lightpaths featuring an ITU-T DWDM MUX structure, or supercarrier-based all-optical OFDM (Level 2 from Fig. 1). The OFDM approach can be used in bandwidth elastic transponders at the optical transmission side in conjunction with both spectral and spatial multiplexing, all supported by the eventual adoption of novel optical fibers [6].
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