公开(公告)号：US20130223838A1

公开(公告)日：2013-08-29

申请号：US13688624

申请日：2012-11-29

Applicant: Fujitsu Optical Components Limited

Inventor： Masakazu Horishita ,  Shinichi Sakuramoto

IPC: H04B10/071

CPC classification number: H04B10/071

Abstract: A transmitting apparatus connected via an optical branching apparatus to an optical communication device group includes a control unit that for each periodic transmission period including a first transmission period with a test period in which the optical communication device group is not allowed to transmit optical signals and a second transmission period without the test period, allows the optical communication device group to transmit the optical signals during a period different from the test period; a test light sending unit that sends test light to the optical branching apparatus during the test period; a light receiving unit that receives optical signals transmitted from the optical communication device group, and reflected light of the sent test light; a measuring unit that measures intensity of the reflected light received at different elapsed times after the test light is sent; and an output unit that outputs information based on the measured intensity.

Abstract translation: 经由光分支装置连接到光通信装置组的发送装置包括控制单元，对于每个周期性的传输周期，包括具有不允许光通信设备组发送光信号的测试周期的第一传输周期，以及 没有测试周期的第二传输周期允许光通信设备组在与测试周期不同的时间段内传输光信号; 测试光发送单元，在测试期间将测试光发送到光分支设备; 光接收单元，其接收从光通信设备组发送的光信号和所发送的测试光的反射光; 测量单元，其测量在发射测试光之后在不同经过时间接收的反射光的强度; 以及输出单元，其基于测量的强度输出信息。

公开(公告)号：US11316590B2

公开(公告)日：2022-04-26

申请号：US17168306

申请日：2021-02-05

Applicant: Fujitsu Optical Components Limited

Inventor： Masakazu Horishita

IPC: H04B10/548 ,  H04J14/02

Abstract: An optical transmission device includes a first detector, a generator, a second detector, and a controller. The first detector detects optical output power of an optical signal for each channel for input to a Mach-Zehnder unit that has asymmetric optical waveguides. The generator superimposes, based on the detected optical output power for each of the channels, a dither signal onto an optical signal in a specific channel from among the plurality of channels for input to the Mach-Zehnder unit. The second detector detects an amplitude value of the dither signal superimposed onto the optical signal in the specific channel output from the Mach-Zehnder unit. The controller adjusts a phase difference in the Mach-Zehnder unit such that the amplitude value of the dither signal superimposed onto the detected optical signal in the specific channel is less than a predetermined threshold.