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

Autor: Y. Zhu, G. Wenke
Přispěvatelé: Publica
Rok vydání: 1983
Předmět:
critical distances
Optical fiber
Materials science
light reflection
Materials Science (miscellaneous)
Physics::Optics
optical fibres
Polarization-maintaining optical fiber
feedback
fiber face
Graded-index fiber
Industrial and Manufacturing Engineering
law.invention
tapered fiber
Optics
microlenses
law
Fiber laser
semiconductor laser coupling to single mode fibres
Dispersion-shifted fiber
Physics::Atomic Physics
Laser power scaling
Business and International Management
feedback characteristics
reflections
far-field pattern
laser power
coupling structures
business.industry
launching efficiency
wavelength stability
gain-guided lasers
unstable laser spectrum
working distance
csp lasers
astigmatism
efficiency
index guiding lasers
Optoelectronics
tapers
laser beam applications
business
laser output power
optical feedback
Tunable laser
Photonic-crystal fiber
Zdroj: Applied optics. 22(23)
ISSN: 1559-128X
Popis: 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.
Databáze: OpenAIRE
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