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:
Jun. 16, 2009
Filed:
Mar. 29, 2007
Tohru Kazawa, Kokubunji, JP;
Masaki Ohira, Yokohama, JP;
Yusuke Yajima, Fujisawa, JP;
Akihiko Tsuchiya, Yokohama, JP;
Yoshinobu Morita, Yokohama, JP;
Tohru Kazawa, Kokubunji, JP;
Masaki Ohira, Yokohama, JP;
Yusuke Yajima, Fujisawa, JP;
Akihiko Tsuchiya, Yokohama, JP;
Yoshinobu Morita, Yokohama, JP;
Hitachi Communication Technologies, Ltd., Tokyo, JP;
Abstract
In a light reception element such as an APD (Avalanche Photo Diode) used for receiving a high-speed and weak optical signal, it is possible to prevent the phenomenon of distortion of a signal inputted after a large-level light is received. A PON (Passive Optical Network) system includes an OLT (Optical Line Terminal) which can impartially and effectively transmit light reception data to each ONU (Optical Network Unit). According to a light reception amplitude received by each ONU, an inter-frame gap of an appropriate length is assigned for each ONU. The OLT includes a unit for measuring and accumulating the reception light amplitude and data on the inter-frame gap of an appropriate length decided in advance according to the characteristic of the light reception device and generates a grant value for assuring an inter-frame gap of an appropriate length by using the both information.