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1. 发明申请

US20190214782A1 PHASE SHIFTER FOR AN OPTICAL PHASE-SENSITIVE AMPLIFIER 审中-公开
公开(公告)号：US20190214782A1
公开(公告)日：2019-07-11
申请号：US15868703
申请日：2018-01-11
申请人： Fujitsu Limited
发明人： Youichi Akasaka , Tadashi Ikeuchi
IPC分类号： H01S3/10 , G02B6/02 , H01S3/30 , G02F1/365
CPC分类号： H01S3/10053 , G02B6/02085 , G02B6/02195 , G02F1/365 , H01S3/302 , H04B10/67 , H04J14/0201
摘要： An FBG element is configured to apply a phase shift to at least one of an input optical signal, a first pump light, and an idler signal between stages of a phase sensitive amplifier. The FBG element is apodized using a trapezoidal apodization function over the length of the first FBG element to enable tuning of the phase shift over a range of 2π radians.

2. 发明授权

US10349154B2 Intra data center optical switching 有权
公开(公告)号：US10349154B2
公开(公告)日：2019-07-09
申请号：US15695801
申请日：2017-09-05
申请人： Fujitsu Limited
发明人： Youichi Akasaka , Tadashi Ikeuchi
IPC分类号： H04J14/00 , H04Q11/00 , H04J14/02
摘要： Methods and systems for intra data center optical switching of optical signals use an intra data center optical switch to optically transmit N optical wavelengths as an optical signal transmitting a data stream generated by a data center system included within N data center systems. The data center system may selectively receive one of N−1 optical wavelengths as another optical signal corresponding to one of N−1 other data center systems excluding the data center system from the intra data center optical switch. In this manner, intra data center optical switching may be performed without utilizing Ethernet and optical switches, which may result in reduced power consumption for data center communication.

3. 发明申请

US20180366900A1 OPTICAL PHASE-SENSITIVE AMPLIFIER WITH SIGNAL NOISE REMOVAL 审中-公开
公开(公告)号：US20180366900A1
公开(公告)日：2018-12-20
申请号：US15628245
申请日：2017-06-20
申请人： Fujitsu Limited
发明人： Youichi Akasaka , Tadashi Ikeuchi , Daniel Bihon , Richard Colter
IPC分类号： H01S3/10 , H01S3/067 , H04B10/291 , G02F1/31 , H01S3/131 , H01S3/30
摘要： Phase modulation of an output optical signal from a phase-sensitive amplifier may be used to perform phase adjustment for optimal phase-sensitive amplification. Specifically, when the optical pump is phase modulated to suppress SBS, a second phase modulator may be used to counter dither the first phase modulator. Both phase modulators may be controlled by a phase shifter. Intensity modulation of the output optical signal may also be performed to reduce noise. In this manner, the OSNR of the output optical signal may be increased.

4. 发明授权

US10050738B1 Low noise colorless, directionless, contentionless reconfigurable optical add/drop multiplexer 有权
公开(公告)号：US10050738B1
公开(公告)日：2018-08-14
申请号：US15412872
申请日：2017-01-23
申请人： Fujitsu Limited
发明人： Youichi Akasaka , Takeshi Hoshida , Tadashi Ikeuchi
IPC分类号： H04J14/02 , H04Q11/00
摘要： Methods and systems for implementing a low noise CDC ROADM include incorporating individual stages of an optical PSA before and after WSSs included in the CDC ROADM. The WSSs may be used to route the pump and idler signals, as well as to perform phase tuning for optimal phase-sensitive amplification.

5. 发明授权

US09515727B2 In-band optical signal-to-noise ratio monitor 有权
标题翻译：带内光信噪比监视器
公开(公告)号：US09515727B2
公开(公告)日：2016-12-06
申请号：US14639757
申请日：2015-03-05
申请人： Fujitsu Limited
发明人： Jeng-Yuan Yang , Youichi Akasaka , Motoyoshi Sekiya , Takuji Maeda , Hiroki Ooi , Satoru Okano
IPC分类号： H04B10/079
CPC分类号： H04B10/07953 , H04B10/07955
摘要： Methods and systems for in-band OSNR monitoring include a tunable optical filter to scan a passband of a desired optical channel. The optical power over the passband is measured and digitized to power waveform data. The power waveform data is processed with a digital signal processor to calculate OSNR. Additionally, various implementations accommodate dual polarization modulation formats using a parallel architecture and an alternating sequential architecture.
摘要翻译：用于带内OSNR监测的方法和系统包括用于扫描期望光通道的通带的可调谐滤光器。通过通带的光功率被测量并数字化以对波形数据供电。用数字信号处理器处理功率波形数据，以计算OSNR。此外，各种实施方式适用于使用并行架构和交替顺序架构的双偏振调制格式。

6. 发明申请

US20150200724A1 CORRECTION TABLE FOR INTERFEROMETRIC OPTICAL SIGNAL-TO-NOISE RATION MONITOR 有权
标题翻译：用于干涉光信号噪声监测的校正表
公开(公告)号：US20150200724A1
公开(公告)日：2015-07-16
申请号：US14153692
申请日：2014-01-13
申请人： Fujitsu Limited
发明人： Jeng-Yuan Yang , Youichi Akasaka , Motoyoshi Sekiya , Takuji Maeda , Hiroki Ooi , Kentaro Nakamura , Satoru Okano
IPC分类号： H04B10/079 , H04B17/00
CPC分类号： H04B10/07953 , H04B17/0085
摘要： The present disclosure includes a computer-implemented method of correcting a measured optical signal-to-noise ratio (OSNR) comprising receiving an optical signal and measuring OSNR of the optical signal using an interferometric OSNR monitor device. The method also includes applying a correction table to the measured OSNR to generate a corrected OSNR using a controller, the correction table comprising a correction function to counteract an artifact in the measured OSNR. The method also includes storing the corrected OSNR in a non-transitory computer-readable medium. The present disclosure also includes associated devices applying the correction table and methods of generating the correction table.
摘要翻译：本公开包括校正测量的光信噪比（OSNR）的计算机实现的方法，包括使用干涉式OSNR监视器装置接收光信号和测量光信号的OSNR。该方法还包括将校正表应用于所测量的OSNR以使用控制器产生校正的OSNR，所述校正表包括校正功能以抵消测量的OSNR中的伪像。该方法还包括将经修正的OSNR存储在非暂时的计算机可读介质中。本公开还包括应用校正表的相关联的设备和生成校正表的方法。

7. 发明申请

US20140369678A1 DUAL-POLARIZATION INTERFEROMETRIC OPTICAL SIGNAL-TO-NOISE RATIO MONITOR 有权
标题翻译：双极化干涉光信号信噪比监测
公开(公告)号：US20140369678A1
公开(公告)日：2014-12-18
申请号：US13920308
申请日：2013-06-18
申请人： Fujitsu Limited
发明人： Jeng-Yuan Yang , Youichi Akasaka , Motoyoshi Sekiya , Takuji Maeda , Hiroki Ooi , Satoru Okano
IPC分类号： H04B10/079 , H04B10/2507
CPC分类号： H04B10/07953 , H04B10/2572
摘要： The present disclosure includes a method of determining optical signal-to-noise ratio (OSNR) of a signal, comprising separating one polarization component from a plurality of polarization components in an optical signal, selecting one wavelength from a plurality of wavelengths in the optical signal, delaying a first portion of the one polarization component of the one wavelength of the optical signal, shifting a phase of the first portion by a first amount and the first amount plus pi radians, causing the first portion to interfere with a second portion, measuring a power of the interference of the first and second portions, receiving the power of the interference, and comparing the power of the interference when the phase is shifted by the first amount with the interference when the phase is shifted by the first amount plus pi radians to determine OSNR. The present disclosure also includes associated devices.
摘要翻译：本公开包括确定信号的光信噪比（OSNR）的方法，包括从光信号中的多个偏振分量中分离一个偏振分量，从光信号中的多个波长中选择一个波长延迟光信号的一个波长的一个偏振分量的第一部分，将第一部分的相位移位第一数量和第一数量加上pi弧度，使第一部分干扰第二部分，测量第一部分和第二部分的干扰的功率，接收干扰的功率，以及当相位偏移第一量与当相位偏移了第一量值加上pi弧度的干扰时，将干扰的功率进行比较以确定OSNR。本公开还包括相关联的设备。

8. 发明授权

US11563300B2 Suppressing signal noise on an optical fiber 有权
公开(公告)号：US11563300B2
公开(公告)日：2023-01-24
申请号：US16569294
申请日：2019-09-12
申请人： Fujitsu Limited
发明人： Youichi Akasaka , Tadashi Ikeuchi
IPC分类号： H01S3/30 , H01S3/10
摘要： An optical system for suppressing signal noise on an optical fiber, including an input power signal; a pump laser configured to receive the input power signal; a phase modulator coupled to the pump laser configured to modulate, in response to the input power signal, a phase of the pump laser to increase a stimulated Brillouin scattering (SBS) threshold of the pump laser, wherein the pump laser is further configured to: increase a power at the pump laser to be greater than the SBS threshold; generate a back scattering power based on the power of the pump laser being greater than the increased SBS threshold; and limit an output power signal of the pump laser based on the generated back scattering power.

9. 发明授权

US11506916B2 Dual polarization optical pumping 有权
公开(公告)号：US11506916B2
公开(公告)日：2022-11-22
申请号：US17227085
申请日：2021-04-09
申请人： FUJITSU LIMITED
发明人： Youichi Akasaka
IPC分类号： G02F1/01 , H04B10/25 , H04B10/66 , H04B10/532
摘要： According to an aspect of an embodiment, operations may include receiving a light wave and generating a pumping wave by performing polarization modulation on the light wave based on a bit stream. The pumping wave may include a first polarization component having a first polarization and a second polarization component having a second polarization and having a same wavelength as the first polarization component. The operations may also include emitting the pumping wave in an optical medium such that the pumping wave amplifies an optical signal propagating within the optical medium.

10. 发明授权

US11438086B2 Optical amplification in an optical network 有权
公开(公告)号：US11438086B2
公开(公告)日：2022-09-06
申请号：US16748076
申请日：2020-01-21
申请人： Fujitsu Limited
发明人： Youichi Akasaka , Takeshi Hoshida
IPC分类号： H04J14/02 , H04B10/556 , H04B10/25 , G02F1/35 , H04B10/2537
摘要： An optical system, comprising a first wavelength conversion module to: adjust a power of a first pump wavelength; couple an input signal with the first pump wavelength to generate a first coupled signal; perform a first wavelength conversion of the first coupled signal to generate a first wavelength converted signal, the power of the first pump wavelength is adjusted such that the first wavelength conversion is performed with 0 dB conversion efficiency; the optical amplifier to amplify the first wavelength converted signal; a second wavelength conversion module to: adjust a power of a second pump wavelength; couple the amplified first wavelength converted signal with the second pump wavelength to generate a second coupled signal; perform a second wavelength conversion of the second coupled signal to generate a second wavelength converted signal with 0 dB conversion efficiency.

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