公开(公告)号：US20190109668A1

公开(公告)日：2019-04-11

申请号：US16139503

申请日：2018-09-24

Applicant: Fujitsu Optical Components Limited

Inventor： Kiyotoshi NOHEJI ,  Masato NISHIHARA

IPC: H04J14/02 ,  H04L27/26 ,  H04B10/572

CPC classification number: H04J14/0278 ,  H04B10/506 ,  H04B10/548 ,  H04B10/572 ,  H04J14/0256 ,  H04J14/0298 ,  H04L27/2697

Abstract: An optical transmitter includes: a light source; a wavelength detecting unit configured to detect a wavelength of light emitted from the light source; a wavelength difference information generating unit configured to generate wavelength difference information representing a wavelength difference between a predetermined reference wavelength and a wavelength of the light detected by the wavelength detecting unit; a subcarrier count determination unit configured to determine a number of subcarriers to be used, based on the wavelength difference indicated by the wavelength difference information; a multi-valued level determination unit configured to determine, for each of the subcarriers, a multi-valued level which is a number of bits transmitted by a corresponding subcarrier of the subcarriers; a modulated signal generating unit configured to generate a modulated signal by modulating the subcarriers such that each of the subcarriers has the determined multi-valued level.

公开(公告)号：US20180294888A1

公开(公告)日：2018-10-11

申请号：US15946202

申请日：2018-04-05

Applicant: Fujitsu Optical Components Limited

Inventor： Sukeyuki IWATA ,  Toshiki TANAKA ,  Masato NISHIHARA ,  Naoki KUWATA

IPC: H04B10/588 ,  H04B10/54 ,  H04B10/61

CPC classification number: H04B10/588 ,  H04B10/541 ,  H04B10/61

Abstract: An optical transmitter includes an optical modulator configured to modulate light from a light source; and a processor configured to generate a drive signal that is input into the optical modulator. The processor inserts a bias control signal amplitude-modulated at a low frequency, into an analog signal at fixed intervals, to generate the drive signal.