Coherent light generators – Particular active media – Semiconductor
Patent
1982-12-09
1985-07-16
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
357 17, 372 46, H01S 319
Patent
active
045300992
ABSTRACT:
Double heterostructure lasers which use a narrow stripe contact exhibit linear characteristics with a low lasing threshold current making them very suitable for fiber optic communication systems. Linearity and low threshold currents are achieved if the carrier current injected into the device is confined to a narrow region of the active layer. To further confine the current a p-type diffusion is performed to produce a relatively low conductivity path between the contact stripe and the lasing region of the active layer. Ideally the diffusion front extends to within 0.5 microns of the active layer. In order to achieve this, a p-type double heterostructure second confining layer of 0.5 microns or less is grown immediately adjacent to the active layer and an n-type blocking layer is grown on the second confining layer. By diffusing the p-type dopant through the n-type blocking layer the diffusion front can be accurately monitored using a scanning electron microscope. As soon as the diffusion front merges with the p-type second confining layer then it can be concluded that it is within 0.5 microns of the active layer. Moreover the pn junction between the second confining layer and the blocking layer is reverse biased in use and so provides further charge carrier confinement in comparison with the conventional wholly p-type second confining layer which is usually of the order of 1.5 .mu.m thick.
REFERENCES:
patent: 4426703 (1984-01-01), Kuroda et al.
Hong et al., Appl. Phys. Lett. 40(3), 1 Feb. 1982, pp. 208-210.
Davie James W.
Northern Telecom Limited
Wilkinson Stuart L.
LandOfFree
Planar narrow-stripe laser with improved charge carrier confinem does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Planar narrow-stripe laser with improved charge carrier confinem, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planar narrow-stripe laser with improved charge carrier confinem will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1739767