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:
Apr. 25, 2000
Filed:
Nov. 18, 1997
Tadayuki Chikuma, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In an optical transmission system in which an optical main signal and a monitoring control optical signal are wavelength-multiplexed and transmitted from a transmitter and the optical signal is directly amplified by a repeater and transmitted, low frequency pulse signals which are synchronized with the respective optical main signal and monitoring control signal are multiplexed with each others, a distance of a transmission section is specified by a phase difference between the low frequency pulse signals according to a difference in propagation rate of a transmission line due to a difference of wavelength between the optical main signal and the monitoring control signal and the optimal dispersion compensation is made possible even when a required dispersion compensation is changed due to a change of the transmission line by switching the optical transmission line to a DCF having an optimal amount of dispersion compensation.