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:
Sep. 05, 2000
Filed:
Mar. 20, 1998
Hiroyuki Nobuhara, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An office-side optical burst receiving apparatus in for example an optical PON transmission system which solves the problem of reception failure due to a low frequency response, constituted by being provided with a pre-amplifier circuit for amplifying an output from a light receiving element, a main amplifier circuit for receiving the output signal thereof and a threshold value as differential inputs and discriminating logics '1' and '0', a threshold control circuit having a '1' level detection circuit and a '0' level detection circuit of the output signal, and a memory/calculation circuit for updating and storing the value regarding the level of the detected logic whenever a cell signal is received. It further contains an adder circuit which defines substantially a half value of a difference of levels of the logics '1' and '0' as a level value, adds the level of the logic '0' detected for the output signal now being received and the stored level, and applies the added value to the main amplifier circuit.