Coherent light generators – Particular active media – Semiconductor
Patent
1995-10-26
1997-08-12
Bovernick, Rodney B.
Coherent light generators
Particular active media
Semiconductor
372 46, 385 43, 385131, H01S 319, G02B 626, G02B 610
Patent
active
056573383
ABSTRACT:
Disclosed is a tapered thickness waveguide integrated semiconductor laser which has an active layer in which light emits and recombines; and an output tapered waveguide which facilitates an optical coupling to an optical fiber; wherein the active layer and the output tapered waveguide are monolithically integrated on a common substrate, and the output waveguide has a buried structure and the width and thickness of the output waveguide are smaller than those of the active layer. The active layer may be placed between two cladding layers each of which has a different conductivity type with each other, and the output tapered waveguide has a portion which contacts undoped cladding layer.
REFERENCES:
Kasaya et al., "Monolithically Integrated DBR Lasers with Simple Tapered Waveguide for Low-Loss Fibre Coupling", Electronics Letters, vol. 29, No. 23, pp. 2067-2068 Nov. 1993.
Moerman et al., "Monolithic Integration of a Spot Size Transformer With a Planar Buried Heterostructure In GaAsP/InP-Laser Using the Shadow Masked Growth Technique", IEEE Photonics Technology Letters, vol. 6, No. 8, pp. 888-890 Aug. 1994.
Tohmori et al., "Spot-size Converted 1.3um laser with Butt-Jointed Selectively Grown Vertically Tapered Waveguide", Electronics Letters, vol. 31, No. 13, pp. 1069-1070 Jun. 1995.
"Tapered Thickness MQW Waveguide BH MQW Lasers", The Institute of Electronics Informations and Communications Engineers, digest of Spring Conference 1994, pp. 4-240. Kobayashi et al. (no month available).
"Monolithically Integrated Laser With a Simple Laterally Tapered Waveguide", The Institute of Electronics Informations and Communications Engineers, digest of Autumn Conference 1993, pp. 4-261 Kasaya et al. (no month available).
"Tapered Thickness MQW Waveguide BH MQW Lasers", IEEE Photonics Technology Letters, vol. 6, No. 9, Sep., 1994, pp. 1080 to 1081 (1994) Kobayashi et al.
"InGaAsP/InP tapered active layer multiquantum well laser with 1.8dB coupling loss to cleaved singlemode fibre", Electronics Letters, 29th Sep. 1994, vol. 30, No. 20, pp. 1685 to 1687 Lealman et al.
Bovernick Rodney B.
NEC Corporation
Phan Luong-Quyen T.
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