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:
Nov. 28, 1978
Filed:
Jun. 29, 1977
Tingye Li, Rumson, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A multimode optical waveguide having refractive index n, width a, and length L is provided with branches on either side of each end and has an electrode pattern capable of differentially delaying the even modes and the odd modes of light of wavelength .lambda. in the waveguide when voltage is applied. When the length L is a half-critical length, calculated to be (2na.sup.2 /.lambda.), or multiple thereof, the device acts as an amplitude modulator or switch. At least one of the electrodes typically is very slender and has a width less than about one-fourth the waveguide width a, so as to achieve different effects on the different modes by causing a laterally nonuniform but bilaterally symmetric refractive index change in the waveguide.