The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1976
Filed:
Jun. 27, 1974
John Edwin Midwinter, Woodbridge, EN;
The Post Office, London, EN;
Abstract
The number of modes propagating as guided modes along a dielectric optical waveguide depends on the refractive index difference between core and cladding materials. By altering this difference the number of modes which are permitted to propagate may be controlled. The effective bandwidth of a dielectric optical waveguide depends on the number of modes transmitted because of group delay dispersion and hence this bandwidth may be controlled by controlling the number of propagating modes. In the case of a liquid cored dielectric optical waveguide, the difference between core and cladding refractive indices and hence the bandwidth may be controlled by controlling the temperature of the dielectric optical waveguide.