1994
DOI: 10.1063/1.111096
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Tapered active stripe for 1.5-μm InGaAsP/InP strained multiple quantum well lasers with reduced beam divergence

Abstract: We propose and demonstrate the application of an intracavity horizontally tapered (in width) active stripe to adiabatically reduce the output beam divergence of a 1.48-μm InGaAsP/InP strained quantum well laser. We achieve far-field full width at half-maximum divergences as low as 13° together with 100 mW emitted power into stable single transverse mode and 400 mA driving current. Maximum coupling efficiency to lensed single mode fiber of 73% is obtained.

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Cited by 70 publications
(7 citation statements)
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“…The mismatch in spot size between semiconductor lasers and optical fibres is overcome by employing laser lenses together with various fibre alignment techniques or by increasing the spot size of the laser [1,2]. The former solution is costly whilst the latter places significant constraints on the active layer thickness and therefore performance.…”
Section: Introductionmentioning
confidence: 98%
“…The mismatch in spot size between semiconductor lasers and optical fibres is overcome by employing laser lenses together with various fibre alignment techniques or by increasing the spot size of the laser [1,2]. The former solution is costly whilst the latter places significant constraints on the active layer thickness and therefore performance.…”
Section: Introductionmentioning
confidence: 98%
“…There are still sophisticated designs such as the buried heterostructure (BH) [17,18], in which the active region stripe was tapered with its width greatly reduced. As such, its mode profile is almost rounded, and so the far-field pattern is.…”
Section: Introductionmentioning
confidence: 99%
“…Various spot-size converters have been studied on lasers or passive components [4][5][6][7][8]. So far, most of them were based on a buried structure [9] with or without selective area growth. Moreover, many of these structures use very narrow waveguides (less than 0.5 µm), which require special lithography and may be sensitive to the width of the taper tip [10].…”
Section: Introductionmentioning
confidence: 99%