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. 10, 1981
Filed:
Dec. 14, 1979
Akira Hasegawa, New Providence, NJ (US);
Bell Telephone Laboratories, Incorporated, Murry Hill, NJ (US);
Abstract
Method for achieving phase matching for electromagnetic radiation propagating through single mode transmission media, such as, for instance, single mode optical fiber. When coherent, monochromatic radiation of essentially constant amplitude, the carrier, is propagating through such a medium, and if the frequency of the carrier is chosen to be within a region of anomalous dispersion of the medium, then, provided the medium has a finite nonlinear coefficient of the index of refraction, the carrier wave is subject to a modulational instability. This instability results in the generation and exponential growth of sidebands, the two closest to the carrrier frequency being the dominant ones. The modulation frequency is proportional to the square root of the power in the carrier wave. Apparatus for using the method is also disclosed, such as apparatus for using the method to tunably generate coherent radiation in the far infrared, apparatus for tunably generating coherent radiation relatively close to the carrier frequency, and apparatus for using the method for amplifying radiation at a frequency relatively close to the carrier frequency.