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公开(公告)号：US20220294534A1
公开(公告)日：2022-09-15
申请号：US17580234
申请日：2022-01-20
Applicant: Fujitsu Optical Components Limited
Inventor： Takeyasu Tomioka , Shuichi Yasuda
Abstract: An optical transmitter includes an optical modulator, a tunable optical filter, a temperature sensor, and a processor. The tunable optical filter is provided on an output side of the optical modulator and transmits light of a frequency corresponding to a control voltage. The temperature sensor detects a temperature around the tunable optical filter. The processor detects an optical loss occurring in the tunable optical filter, calculates a width of a range of the control voltage in which the detected optical loss is smaller than a specified threshold, adjusts the control voltage based on the temperature detected by the temperature sensor, and shifts the control voltage by a specified amount that is larger than zero and smaller than or equal to a half of the calculated width of the range when the optical loss is larger than or equal to the threshold.
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公开(公告)号：US09020363B2
公开(公告)日：2015-04-28
申请号：US13661606
申请日：2012-10-26
Applicant: Fujitsu Optical Components Limited
Inventor： Shuichi Yasuda
IPC: H04B10/04 , H04B10/50 , H04B10/548
CPC classification number: H04B10/50575 , H04B10/548
Abstract: After a startup of an optical transmitter, a control is started in such a way that a modulation amplitude of a driving signal of a phase modulator is set as 0, and that an operational point of a bias voltage is set as the lowest point of light transmission characteristics of the phase modulator. When the operational point of the bias voltage reaches the lowest point, the modulation amplitude of the driving signal is gradually increased from 0 to 2Vπ.
Abstract translation: 在光发射机的启动之后，开始控制，使得相位调制器的驱动信号的调制幅度被设置为0，并且将偏置电压的操作点设置为最低点 相位调制器的传输特性。 当偏置电压的工作点达到最低点时，驱动信号的调制幅度从0逐渐上升到2V＆pgr。
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公开(公告)号：US20200381895A1
公开(公告)日：2020-12-03
申请号：US16864399
申请日：2020-05-01
Applicant: Fujitsu Optical Components Limited
Inventor： Shuichi Yasuda , Tamotsu Akashi
IPC: H01S5/0687 , H01S3/13 , H01S5/068 , H01S5/06
Abstract: An optical module includes an optical device that outputs an optical signal corresponding to a control voltage, a voltage controller that applies the control voltage on which a dither signal is superimposed to the optical device, a monitor unit that monitors the optical signal output from the optical device, and outputs a monitor signal, a multiplier that multiplies the monitor signal by a reference signal corresponding to the dither signal, a filter unit that extracts a direct-current component included in a multiplication result, and a controller that causes the voltage controller to change the control voltage in accordance with the direct-current component. The controller changes the frequency of the dither signal or the reference signal such that the frequency of the reference signal is twice as large as that of the dither signal, when the direct-current component satisfies a predetermined condition.
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Patent Agency Ranking
公开(公告)号：US20180152242A1
公开(公告)日：2018-05-31
申请号：US15723462
申请日：2017-10-03
Applicant: Fujitsu Optical Components Limited
Inventor： Masayuki Kurisu , Shuichi Yasuda
IPC: H04B10/079 , H04B10/61 , H04J14/06
CPC classification number: H04B10/0795 , H04B10/60 , H04B10/613 , H04B10/616 , H04B10/6166 , H04J14/02 , H04J14/06
Abstract: An optical receiver includes a processor. The processor calculates first through fourth optical intensities that respectively indicate input optical intensities of in-phase component in the first polarization, quadrature component in the first polarization, in-phase component in the second polarization and quadrature component in the second polarization. The processor calculates polarization dependent intensity ratio and phase dependent intensity ratio based on the first through fourth optical intensities. The processor calculates an input optical intensity of a polarization multiplexed optical signal based on an optical intensity of one of the first through fourth amplifiers, the polarization dependent intensity ratio, and the phase dependent intensity ratio.
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公开(公告)号：US10670809B2
公开(公告)日：2020-06-02
申请号：US16380464
申请日：2019-04-10
Applicant: Fujitsu Optical Components Limited
Inventor： Shuichi Yasuda
Abstract: An optical transmission device controls driving of a mirror that adjusts an attenuation amount of a VOA and a transmission frequency of a TOF. The device acquires an adjustment amount of a reference voltage in which the intensity of output light becomes a target at detecting a change in the attenuation amount. The device calculates a deviation of an attenuation amount by using a difference between the reference frequency and the adjusted frequency specified from the characteristic of the mirror. The device calculates a deviation of an attenuation amount from a relationship at detecting a change in a new attenuation amount. The device calculates an adjustment amount by using a difference between the voltage of the reference frequency specified from the characteristic and the voltage of the frequency that is after deviation, adds the adjustment amount to the reference voltage, and sets the result.
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公开(公告)号：US11387910B2
公开(公告)日：2022-07-12
申请号：US16864399
申请日：2020-05-01
Applicant: Fujitsu Optical Components Limited
Inventor： Shuichi Yasuda , Tamotsu Akashi
Abstract: An optical module includes an optical device that outputs an optical signal corresponding to a control voltage, a voltage controller that applies the control voltage on which a dither signal is superimposed to the optical device, a monitor unit that monitors the optical signal output from the optical device, and outputs a monitor signal, a multiplier that multiplies the monitor signal by a reference signal corresponding to the dither signal, a filter unit that extracts a direct-current component included in a multiplication result, and a controller that causes the voltage controller to change the control voltage in accordance with the direct-current component. The controller changes the frequency of the dither signal or the reference signal such that the frequency of the reference signal is twice as large as that of the dither signal, when the direct-current component satisfies a predetermined condition.
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公开(公告)号：US10044439B2
公开(公告)日：2018-08-07
申请号：US15723462
申请日：2017-10-03
Applicant: Fujitsu Optical Components Limited
Inventor： Masayuki Kurisu , Shuichi Yasuda
Abstract: An optical receiver includes a processor. The processor calculates first through fourth optical intensities that respectively indicate input optical intensities of in-phase component in the first polarization, quadrature component in the first polarization, in-phase component in the second polarization and quadrature component in the second polarization. The processor calculates polarization dependent intensity ratio and phase dependent intensity ratio based on the first through fourth optical intensities. The processor calculates an input optical intensity of a polarization multiplexed optical signal based on an optical intensity of one of the first through fourth amplifiers, the polarization dependent intensity ratio, and the phase dependent intensity ratio.
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公开(公告)号：US09647753B1
公开(公告)日：2017-05-09
申请号：US14993484
申请日：2016-01-12
Applicant: Fujitsu Optical Components Limited
Inventor： Masayuki Kurisu , Shuichi Yasuda , Takeyasu Tomioka
IPC: H04B10/06 , H04B10/079 , H04J14/02 , H04B10/61
CPC classification number: H04B10/07957 , H04B10/614 , H04B10/615 , H04J14/0221
Abstract: A coherent optical receiver includes: an attenuator that adjusts a power of an input optical signal; a mixer that mixes an optical signal output from the attenuator and local oscillator light; a photo detector that converts an optical signal output from the mixer into an electric signal; an amplifier that amplifies an output signal of the photo detector; a gain controller that controls a gain of the amplifier; a memory that stores dependence information that indicates a relation between an input optical power of an optical signal of a specified wavelength and a gain of the amplifier; and a controller that calculates an input optical power of the target wavelength based on a gain of the amplifier and the dependence information, and controls an attenuation amount of the attenuator based on the calculated input optical power, when a WDM optical signal is input into the coherent optical receiver.
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