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:
Feb. 23, 1999
Filed:
Jul. 22, 1997
Victor Mizrahi, Columbia, MD (US);
Stephen R Harmon, Severn, MD (US);
Ciena Corporation, Linthicum, MD (US);
Abstract
In accordance with the present invention, an in-fiber Bragg grating is coupled to the output of a directly modulated DFB laser. The output of the DFB laser is spectrally broadened, but has peak optical power at the channel wavelength. Typically, the grating is designed to have a substantially vertical 'edge', i.e., segment of the transmissivity vs. wavelength characteristic, at a particular wavelength, between a transmission minimum and a transmission maximum. Amounts of light transmitted through and reflected by the grating are compared to adjust the channel wavelength to a desired wavelength at or near the edge of the grating.