Distance-Aware Optimization of Fractional Bandwidth in SOA-Based Photonic UWB Systems Across the S-, C-, and L-Bands

Filiz M., SARAÇOĞLU Ö. G.

IEEE Access, cilt.14, ss.83367-83376, 2026 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 14
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1109/access.2026.3699014
  • Dergi Adı: IEEE Access
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC, Directory of Open Access Journals
  • Sayfa Sayıları: ss.83367-83376
  • Anahtar Kelimeler: Fractional bandwidth (FBW), pulse generation, semiconductor optical amplifier (SOA), ultra-wideband (UWB)
  • Erciyes Üniversitesi Adresli: Evet

Özet

This study investigates distance-dependent optimization of fractional bandwidth (FBW) while ensuring compliance with the Federal Communications Commission (FCC) spectral mask in a semiconductor optical amplifier (SOA)-based photonic ultra-wideband (UWB) pulse generation system. Fiber lengths of 40, 80, and 100 km across the S-, C-, and L-bands are analyzed to evaluate distance-induced spectral variations. FBW is adopted as the primary optimization metric, while FCC mask compliance is considered as a regulatory constraint. The simulation results demonstrate high spectral efficiency, with FBW values ranging from 88-100% in the S-band, 92-100% in the C-band, and 96-100% in the L-band. Although FBW gradually decreases with increasing fiber length due to nonlinear SOA dynamics and fiber dispersion, the level of degradation is strongly band-dependent. In particular, the L-band exhibits superior long-distance robustness, maintaining near-maximum FBW values (96-97%) even at a fiber length of 100 km, whereas the S-band shows higher sensitivity to propagation distance. The C-band provides balanced intermediate performance. Accordingly, this study provides a practical framework for distance-aware band selection in long-distance UWB-over-fiber communication systems.