公开(公告)号：US09667350B2

公开(公告)日：2017-05-30

申请号：US14758941

申请日：2014-01-24

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Kengo Horikoshi ,  Kohki Shibahara ,  Etsushi Yamazaki ,  Mitsuteru Yoshida ,  Koichi Ishihara ,  Takayuki Kobayashi ,  Yoshiaki Kisaka ,  Takuya Ohara ,  Masahito Tomizawa ,  Tomoyoshi Kataoka

IPC: H04B10/60 ,  H04B10/61 ,  H04L27/06 ,  H04L27/38 ,  H04L7/00

CPC classification number: H04B10/6165 ,  H04L7/0041 ,  H04L7/0075 ,  H04L27/066 ,  H04L27/389

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.