Effective linewidth reduction in self-homodyne coherent reception by stimulated Brillouin scattering-based optical carrier recovery
Abstract
In this paper, we demonstrate a self-homodyne coherent system with a significantly narrowed effective linewidth using optical carrier recovery based on stimulated Brillouin scattering (SBS), employing only coarse path length matching. The effective linewidth of the SBS-based receiver system is reduced from 75 kHz to less than 2 kHz, which is estimated by Lorentzian fitting of power spectra, and confirmed by simulation results of the tolerance window length for phase noise compensation (PNC) with different linewidth. Both experimental and numerical studies on the tracking requirements on PNC algorithms confirm effective linewidth reduction to this level, and show a 32x relaxation of the phase recovery tracking window length. This highlights the potential to significantly reduce the computational complexity of PNC even in coarsely optimized SBS-based self-homodyne coherent systems, providing an alternative to using demanding ultra-low linewidth lasers.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 27, 2021
- Source ID
- 10.1364/oe.430439
Entities
People
- Amol Choudhary
- Ben Eggleton
- Bill Corcoran
- Cai Li
- Moritz Merklein
- Yang Liu
Organizations
- Air Force Office of Scientific Research
- Australian Research Council
- Indian Institutes of Technology
- Monash University
- Office of Naval Research Global
- Science and Engineering Research Board
- University of Sydney