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:
Jul. 30, 2002
Filed:
Jan. 26, 1999
Takaharu Tomita, Kanagawa, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
In an optical wavelength multiplexing system capable of multiplexing 16 wavelengths at maximum, when only a part of wavelengths are used in an initial operation in a newly established system, the operation of an optical amplifier causes the level of an optical signal per wavelength to be too high, thereby deteriorating the waveform of an optical signal by the nonlinear effect in a transmission line, etc. As a result, the transmission quality is lowered because the system is established based on 16 multiplexed wavelengths. Therefore, when only a part of the 16 waves are used as signal wavelengths, a light having a wavelength &lgr;c different from the signal wavelength is transmitted with the optical signal so that a total level of a light propagated in a transmission line can be equal to the level obtained when 16 waves are wavelength-multiplexed. Thus, the level of the optical signal having each wavelength is approximately adjusted.