Selectively dispersive optical waveguide films

• US 4,606,602 A
• Filed: 12/01/1982
• Issued: 08/19/1986
• Est. Priority Date: 12/01/1981
• Status: Expired due to Fees

• Current Assignee: Ant Nachrichtentechnik GmbH
• Original Assignee: Ant Nachrichtentechnik
• Inventors: Unger, Hans-Georg, Jacob, Jorn
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Gonzalez, Frank
• Application Number:
  US06/445,995
• Time in Patent Office: 1,357 Days
• Field of Search: 350/96.11, 350/96.12, 350/96.15, 350/96.16, 350/96.17, 350/96.18, 350/96.19
• US Class Current: 385/130
• CPC Class Codes: G02B 6/122 Basic optical elements, e.g. light-guiding paths

Abstract

Planar waveguide film structure for an integrated optical system, composed of: a carrier substrate having a first index of refraction n_s ; a film having a selected thickness D and a second index of refraction n_F greater than the first index of refraction applied onto the substrate for substantially guiding light waves; and a localized optically effective coating applied to the film, the coating having an index of refraction n_A and a thickness d such that the following conditions apply:

0.05 D<d<1.00 D

n.sub.S <n.sub.F <n.sub.A.

Claims

1. Planar waveguide film structure for propagating light waves in an integrated optical system, comprising:

a carrier substrate having a first index of refraction n_S ;

a film having a second index of refraction n_F greater than the first index of refraction applied onto said substrate for substantially guiding the light waves being propagated in said structure; and

an optically effective coating applied to said film, said coating having an index of refraction n_A and forming with the portion of said film therebelow an optical component, wherein;

n_S =1.4;

n_F =1.51;

n_A =1.53;

the ratio of the thickness of said coating to the thickness of said portion of said film is 1;

10; and

the thickness of said coating is approximately 0.65 times λ

, where λ

is the free space wavelength of the light waves to be guided by said structure;

so that at ##EQU2## where d is the thickness of said coating, said optical component has a minimum dispersion value.

2. Structure as defined in claim 1 wherein said coating is embedded completely in said film.

3. Structure as defined in claim 1 wherein said coating is partially embedded in said film to a depth of approximately 50% of the thickness of said coating.

4. Structure as defined in claim 1 wherein said coating is localized to be disposed on only a portion of said film.

5. Structure as defined in claim 4 wherein said coating has the form of a lens.

6. Structure as defined in claim 4 wherein said coating has the form of a prism.

7. Planar waveguide film structure for propagating light waves in an integrated optical system, comprising:

a carrier substrate having a first index of refraction n_S ;

a film having a second index of refraction n_F greater than the first index of refraction applied onto said substrate for substantially guiding the light waves being propagated in said structure; and

an optically effective coating applied to said film, said coating having an index of refraction n_A and forming with the portion of said film therebelow an optical component, wherein;

n_S =1.4;

n_F =1.51;

n_A =1.53;

the ratio of the thickness of said coating to the thickness of said portion of said film is 1.5; and

the thickness of said coating is approximately 0.8 times λ

, where λ

is the free space wavelength of the light waves to be guided by said structure;

so that at ##EQU3## where d is the thickness of said coating, said optical component has a minimum dispersion value.

8. Structure as defined in claim 7 wherein said coating is embedded completely in said film.

9. Structure as defined in claim 7 wherein said coating is partially embedded in said film to a depth of approximately 50% of the thickness of said coating.

10. Structure as defined in claim 7 wherein said coating is localized to be disposed on only a portion of said film.

11. Structure as defined in claim 10 wherein said coating has the form of a lens.

12. Structure as defined in claim 10 wherein said coating has the form of a prism.

13. Planar waveguide film structure for propagating light waves in an integrated optical system, comprising:

a carrier substrate having a first index of refraction n_S ;

a film having a second index of refraction n_F greater than the first index of refraction applied onto said substrate for substantially guiding the light waves being propagated in said structure; and

an optically effective coating applied to said film, said coating having an index of refraction n_A and forming with the portion of said film therebelow an optical component, wherein;

n_S =1.4;

n_F =1.41;

n_A =1.68;

the ratio of the thickness of said coating to the thickness of said portion of said film is 1;

10; and

the thickness of said coating is approximately 0.34 times λ

, where λ

is the free space wavelength of the light waves to be guided by said structure;

so that at ##EQU4## where d is the thickness of said coating, said optical component has a maximum dispersion value.

14. Structure as defined in claim 13 wherein said coating is embedded completely in said film.

15. Structure as defined in claim 13 wherein said coating is partially embedded in said film to a depth of approximately 50% of the thickness of said coating.

16. Structure as defined in claim 13 wherein said coating is localized to be disposed on only a portion of said film.

17. Structure as defined in claim 16 wherein said coating has the form of a lens.

18. Structure as claimed in claim 16 wherein said coating has the form of a prism.