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. 12, 1996
Filed:
Mar. 13, 1995
Applicant:
Inventors:
Hideaki Arai, Hitachi, JP;
Hisato Uetsuka, Hitachi, JP;
Assignee:
Hitachi Cable, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 27 ; 385 15 ; 359127 ;
Abstract
A guided-wave optical multi/demultiplexer is capable of providing a wide wavelength band freely. Each of two directional couplers is constructed so that the coupling ratio of light intensity in the wavelength .lambda..sub.2 is at least 50% and the coupling ratio of light intensity in the wavelength .lambda..sub.3 having a wavelength band in close proximity to the wavelength .lambda..sub.1 is 0% or 100%, the light in the wave band containing the wavelength .lambda..sub.1 and the wavelength .lambda..sub.3 and the light in the wave band containing the wavelength .lambda..sub.2 being multiplexed and demultiplexed.