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. 24, 1987
Filed:
Jun. 22, 1984
Hans-Georg Unger, Brunswick, DE;
ANT Nachrichtentechnik GmbH, Backnang, DE;
Abstract
A symmetrical waveguide coupler having two signal channels for coupling a first signal having a wavelength .lambda..sub.1 and a second signal having a wavelength .lambda..sub.2 which is longer than .lambda..sub.1. The coupler includes a carrier substrate and first and second dielectric strips embedded in the substrate to form two identical dielectric waveguides which together with the substrate define a coupling region. The first waveguide has first and second arms connected to the coupling region and the second waveguide has a third arm connected to the coupling region. The second and third arms are oriented in a direction facing away from the first arm. The dielectric strips are so dimensioned and arranged within the substrate as to present an effective coupling length c.sub.1 L.sub.1 equal to .pi./.sub.2 at a wavelength of .lambda..sub.1 for coupling the first signal between the first and third arms and an effective coupling length c.sub.1 L.sub.1 equal to .pi. at a wavelength of .lambda..sub.2 for coupling the second signal between the first and second arms, with c.sub.1 being the coupling coefficient between the fundamental modes of the signals in the strips and a function of wavelength, and L.sub.1 being the length of the coupling region.