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Article comprising a passive optical waveguide
| Details |
Inventors: Blyler, Jr., Lee L.; Chandross, Edwin A.; Cohen, Leonard G.; Manzione, Louis T.;
Assignee: AT&T Bell Laboratories (Murray Hill, NJ)
Primary Examiner: Healy; Brian
Assistant Examiner:
Attorney, Agent or Firm: Finston; M. I., Pacher; E. E.
Disclosed is a planar optical waveguide that is manufacturable by the compression molding or embossing of a multilayer film of polymeric material. In one embodiment, the waveguide comprises a core layer of relatively high refractive index included between cladding layers of lower refractive index. The waveguiding channels are bounded by regions where the cladding layers are in contact and from which core material has been excluded. |
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DETAILED DESCRIPTION In a broad sense, the invention is an article which comprises a polymeric waveguiding film mounted on a substantially planar surface of a base member.
The film comprises a layer of core material having a glass transition temperature T.
sub.
g, and overlying the core layer, a layer of cladding material having a melting point T.
sub.
m or glass transition temperature T.
sub.
g,clad which is greater than T.
sub.
g.
At least at a given wavelength, the refractive index of the core material is greater than the refractive index of the cladding material.
As a consequence, the cladding material serves an optical waveguiding function, confining at least some electromagnetic radiation to the core layer.
The base member optionally includes a polymeric second cladding layer, which also has a melting point or glass transition temperature greater than T.
sub.
g, mounted on a substantially planar surface of a substrate such that it underlies the core layer.
At least at the given wavelength, the refractive index of the core material should also be greater than the refractive index of the material of the second cladding layer, such that this layer also serves an optical waveguiding function.
If such a second cladding layer is not included, then, in any case, that portion of the substrate that underlies the core layer should have a refractive index (at least at the given wavelength) smaller than that of the core material, such that the portion serves an optical waveguiding function.
At least one waveguiding channel is defined in the film, extending substantially parallel to the surface of the base member and adapted for guiding electromagnetic radiation of the given wavelength.
The channel comprises a core of core material having a substantially planar lower surface in contact with the surface of the base member.
The waveguiding channel further comprises at least an upper cladding of cladding material overlying and at least partially surrounding the core, such that the core has an upper surface (which is typically a curved surface) in contact with the upper cladding
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