Abstract
We compare the long-haul coherent transmission performance of 30 GBaud DP-16-QAM WDM signals using five different S-band optical amplifiers: a thulium doped fiber amplifier (TDFA), a distributed Raman amplifier (DRA) and three different lumped Raman amplifiers (LRAs) using 10 km inverse dispersion fiber (IDF), 10 km, and 5 km Raman optical fibers (ROFs). Over 1050 km standard single-mode fiber (SSMF), the DRA performed the best with an SNR of 14.2 dB at the optimum launch power of -2.3 dBm, followed by the TDFA with an SNR of 13.0 dB and the LRA using 10 km IDF with 11.6 dB of SNR.
| Original language | English |
|---|---|
| Pages (from-to) | 349-352 |
| Number of pages | 4 |
| Journal | IEEE Photonics Technology Letters |
| Volume | 38 |
| Issue number | 5 |
| Early online date | 28 Nov 2025 |
| DOIs | |
| Publication status | E-pub ahead of print - 28 Nov 2025 |
Bibliographical note
For the purpose of open access, the author(s) has applied a Creative Commons Attribution (CC BY) license to any Accepted Manuscript version arising.Funding
This work was supported by UK EPSRC grants ARGON (EP/V000969/1), TRANSNET (EP/R035342/1) Royal Society grants (IES/IE/223001) and the department of Science and Innovation and Technology and the Royal Academy of Engineering under Research Fellowship. The authors thank Lightera for the provision of the Raman optical fibers (ROFs).
Keywords
- Optical fiber amplifiers
- Gain
- Optical fiber dispersion
- Optical fibers
- Stimulated emission
- Signal to noise ratio
- Noise figure
- Wavelength division multiplexing
- Optical fiber couplers
- Optical losses