Browse Prior Art Database

Original Publication Date: 1979-Jun-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 298K

Publishing Venue

Xerox Disclosure Journal


With the development of integrated optical circuits, there is a need to provide coupling of light from one optical waveguide or light source to another optical waveguide. One way of accomplishing this coupling of light is to align and secure the cleaved facet of a heterostructure diode laser (output) with the input of an optical circuit, such as an optical fiber or an optical waveguiding layer. This is a difficult task since the active layer of the laser is submerged and the optical circuit to which coupling is desired may be surface element and alignment of these two becomes very arduous.

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Donald R. Scifres

Proposed Classification
U.S~Cl. 331/94,5H mt. CL H01s 3/00

F/a 1

Volume 4 Number 3 May/3une 1979 361

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Figure 1 shows another way to perform this coupling in an integrated structures Rather than couple light from the cleaved facets of the laser 1, the light is transferred through the upper layers of the laser and there converted into a surface wave~ Wave radiation 3 is extracted from the submerged active laser 2 at an angle due to the submerged grating 4~ The radiation 3 is then converted into a confined wave 5 in a waveguiding layer 6 at the surface of laser I~

There are several ways in which this conversion in layer 6 may be accomplished, two of which are shown respectively in Figures 1 and 2~ In Figure 1, a periodic perturbation or grating 7 is used to enhance desired scattering directions while one end 8 of the guiding layer 6 may be made reflective in order to couple more radiation in a single output directions In Figure 2, a tapered coupler 9 is shown for reflecting and guiding light along waveguiding layer 6~

Waveguiding layer 6 is coupled at 10 to an optical circuit 11~

                 XEROX DISCLOSURE 3OURNAL 362 Volume 4 Number 3 ~v1ay/3une1979

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