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Optoelectronic integrated semiconductor device including a separator of the TE and TM polarizations
| Details |
Inventors: Gamonal, Remi;
Assignee: U.S. Philips Corp. (New York, NY)
Primary Examiner: Lee; John D.
Assistant Examiner: Heartney; Phan T.
Attorney, Agent or Firm: Botjer; William L.
An optoelectronic integrated semiconductor device including a separator of the polarizations TE and TM, this separator comprising two parallel and monomode optical guides G.sub.1 and G.sub.2, one of which receives at the input a luminous signal, and comprising means for carrying out the separation of this signal and its two components TE and TM, one of which TE is transported to the output through one of the guides and the other component TM is transported to the output through the other guide, characterized in that: the guides are formed by at least a heterostructure S/C.sub.1 and by two parallel erected guiding ribbons R at the surface, and the means for carrying out the separation of the components TE and TM consist of a matallic layer extending between the guiding ribbons at the surface of the structure over a length D, whose value is connected with the coupling length of the component TE by the relation D=L.sub.c (TE), the parameters of the physical quantities of the device being chosen so that the relation L.sub.c (TE)=2L.sub.c (TM), is satisfied |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown diagrammatically, viewed from above, in FIG.
1a, the separator of the TE and TM polarizations according to the invention comprises, formed on a substrate S of a III-V material: two optical parallel guides G.
sub.
1 and G.
sub.
2, respectively, integrated on this substrate S, having a transverse dimension W, spaced apart by an edge-to-edge distance d and made themselves of III--V material, and, arranged between the two optical guides G.
sub.
1 and G.
sub.
2, a metallic layer 10.
This layer has a transverse dimension d identical to the distance which separates the guides from edge-to-edge and a longitudinal dimension D, whose value will be defined hereinafter.
The dimensions and characteristics of the guides G.
sub.
1 and G.
sub.
2 are chosen so that they are monomode, that is to say that for a given wavelength they transport the fundamental mode or zero order mode.
A light beam being applied to the input I.
sub.
1 of the guide G.
sub.
1, the object of the invention is to obtain that one of the components TE or TM is available at the output O.
sub.
1 of the guide G.
sub.
1 so that it continues to be transported through this guide G.
sub.
1, and that the other component is then available at the output O.
sub.
2 of the guide G.
sub.
2 so that it continues to be transported through this guide G.
sub.
2, these components TE and TM of the initial signal thus being separated.
The assembly of FIGS.
2 and the assembly of FIGS.
3 each illustrate a method of manufacturing the optical guides integrated on III-V material and apt to constitute a separator of TE and TM polarizations according to the invention.
FIGS.
2a and 2b show in a sectional view taken on the axis I--I and the axis II--II of FIG.
1a, respectively, the device according to the invention in the first embodiment.
FIGS.
3a and 3b show in a sectional view taken on the axis I--I and the axis II--II of FIG.
1, respectively, the device according to the invention in the second embodiment.
In one and the other of these embodiments, the optical guides are constituted by a guiding layer C
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LCD 
