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:
Aug. 18, 1998
Filed:
Dec. 04, 1995
Mizuyuki Ushirozawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
It is the object of the invention to provide a lightwave transmitter, in which the lightwave surge is not generated, as soon as the input lightwave signal is down momentarily. A signal down detecting circuit monitors a data signal and a clock signal, and generates a down detecting signal, as soon as one down of the data and clock signals is detected, and till a predetermined period of time, which is longer than a mean life time of carriers on excitation level of Er-doped optical fiber, has passed. While the down detecting signal is supplied, an output power control circuit stops the supply of a pumping light power. Moreover, while the down detecting signal is generated, the supply of the lightwave signal by the electrical to lightwave signal converter is ceased. As mentioned in the above, since the amplification of the light power signal is restarted after the energy of carriers sufficiently decreased by spontaneous emissions of carriers, the light wave surge is not generated.