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:
May. 30, 2017
Filed:
Jan. 24, 2014
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Kengo Horikoshi, Yokosuka, JP;
Kohki Shibahara, Yokosuka, JP;
Etsushi Yamazaki, Yokosuka, JP;
Mitsuteru Yoshida, Yokosuka, JP;
Koichi Ishihara, Yokosuka, JP;
Takayuki Kobayashi, Yokosuka, JP;
Yoshiaki Kisaka, Yokosuka, JP;
Takuya Ohara, Yokosuka, JP;
Masahito Tomizawa, Yokosuka, JP;
Tomoyoshi Kataoka, Yokosuka, JP;
Nippon Telegraph And Telephone Corporation, Tokyo, JP;
Abstract
The optical receiving device with phase compensation apparatus uses coherent opto-electric conversion and is designed for receiving phase- or quadrature-amplitude-modulated optical signals. The phase compensation apparatus includes following elements: a carrier-phase estimation unit that estimates carrier phase errors in a received symbol string; a gain adjustment unit that adjusts weighting of each symbols in phase error evaluation performed in the carrier-phase adjustment unit; a phase-cycle-slip reduction unit with a phase-cycle-slip detector using statistical processing performed on the output symbols from the carrier-phase estimation unit; and a phase compensation circuit that compensates carrier phase errors of the received signal using an output from the carrier phase estimation unit.