PMID: 18200274Dec 1, 1983Paper

Comparison of efficiency and feedback characteristics of techniques of coupling semiconductor lasers into single-mode fiber

Applied Optics
G Wenke, Y Zhu

Abstract

The coupling of CSP lasers to single-mode fibers with different coupling structures made on the fiber face is investigated. In this case easy to make coupling arrangements such as tapers and microlenses, result in a high launching efficiency (approximately 2-dB loss), in contrast to launching from gain-guided lasers with strong astigmatism and a broader far-field pattern. Index-guiding lasers exhibit, however, a higher sensitivity to optical feedback. Laser output power and wavelength are changed due to reflections from the fiber tip. Critical distances exist which lead to a highly unstable laser spectrum. A comparison of the influence of various fiber faces on laser power and wavelength stability is presented. It is concluded that a tapered fiber end with a large working distance reduces the influence on the laser's performance.

References

Jan 1, 1974·Applied Optics·L G Cohen, M V Schneider
Jun 1, 1979·Applied Optics·M Saruwatari, K Nawata
Dec 1, 1982·Applied Optics·M Shirasaki, K Asama

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Citations

Apr 20, 1993·Applied Optics·C A EdwardsL W Stulz
Jan 31, 2006·Optics Letters·Enbang Li
Dec 1, 1984·Applied Optics·W B Joyce, B C DeLoach
Jun 20, 1990·Applied Optics·H M PresbyC A Edwards

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