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1983
Journal Article
Titel
Comparison of efficiency and feedback characteristics of techniques for coupling semiconductor lasers to single-mode fiber
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.
Language
English
Tags
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feedback
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laser beam applications
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light reflection
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optical fibres
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semiconductor laser coupling to single mode fibres
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index guiding lasers
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laser output power
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critical distances
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efficiency
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feedback characteristics
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csp lasers
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coupling structures
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fiber face
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tapers
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microlenses
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launching efficiency
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gain-guided lasers
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astigmatism
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far-field pattern
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optical feedback
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reflections
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unstable laser spectrum
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laser power
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wavelength stability
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tapered fiber
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working distance