Answers are grounded in this paper and cite their sources.
Two novel external cavity lasers are demonstrated experimentally. The first utilises a Bragg grating fabricated in highly birefringent optical fibre and offers the ability to switch between modes that are separated in polarisation and wavelength. The second utilises two spatially separate Bragg gratings fabricated in mono-mode fibre. Both can be used for tunable beat frequency generation.
No takes yet. Share an insight, caveat, or question.
Reilly et al. (2002) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: