Answers are grounded in this paper and cite their sources.
A very compact and rugged all-fibre coupler for wavelength division multiplexing has been realised. The advantages of this type of coupler are low insertion loss (1 dB–1.5 dB), high crosstalk attenuation (> 35 dB for duplexing), simple and cheap fabrication and excellent stability against environmental factors.
No takes yet. Share an insight, caveat, or question.
Rode et al. (1982) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: