Network upgrade exploiting multi band: S- or E-band?

Nowadays, the fiber spectrum is only partially exploited, i.e., mainly in C-band and more recently C + L-band, where attenuation profile experiences minimum. Thus, communications technology—amplifiers, switching, transceivers, etc.—and networking solutions are mature for those bands. However, continuous increase traffic means that capacity saturation of current infrastructure looming. Taking advantage unused portions (e.g., S- E-bands) may be an efficient solution to accommodate without installing new fibers. Research thus investigating multi-band transmission evaluate enable such network upgrades. Some issues need solved or taken into account, from enabling technology amplifiers E-band still under development) physical layer effects previously neglected, as stimulated Raman scattering (SRS). SRS affects wideband transmission, potentially degrading active channels. The contribution this paper investigation upgrades L-band systems. In particular, exploiting E- S-bands compared taking account each band on both already deployed channels (in C- L-bands). A detailed analysis provided also presence guard bands between exploited used upgrade. By leveraging assessment, a carried out supported signal quality degradation due results suggest support comparable traffic. exploitation with 14 THz E-bands avoid detrimental suggesting upgrade strategy can most effective two.