-
公开(公告)号：US11533548B2
公开(公告)日：2022-12-20
申请号：US17360002
申请日：2021-06-28
申请人： FUJITSU LIMITED
IPC分类号： H04Q11/00 , H04J14/02 , H04B10/291
摘要： A transmission device including a demultiplexer configured to demultiplex a multiplexed light obtained by multiplexing the plurality of wavelength division multiplexing (WDM) optical signals including different wavelength bands into the plurality of WDM optical signals, a plurality of optical amplifiers configured to amplify the plurality of WDM optical signals, respectively, a wavelength converter configured to convert a first wavelength band of the wavelength bands of at least a first WDM optical signal of the plurality of WDM optical signals amplified by the plurality of optical amplifiers into a second wavelength band of the wavelength bands of a second WDM optical signal of the plurality of WDM optical signals so that the second wavelength band does not overlap among the wavelength bands, and a multiplexer configured to multiplex the plurality of WDM optical signals which include the wavelength bands converted by the wavelength converter.
-
公开(公告)号：US20220060273A1
公开(公告)日：2022-02-24
申请号：US17515702
申请日：2021-11-01
申请人： FUJITSU LIMITED
发明人： Tomoyuki Kato , Shigeki Watanabe , Takeshi Hoshida
摘要： An optical transmission device includes a first wavelength multiplexer, a second wavelength multiplexer, a wavelength converter and a third wavelength multiplexer. The first wavelength multiplexer multiplexes optical signals in a first wavelength band to generate first wavelength multiplexed light. The second wavelength multiplexer multiplexes optical signals in the first wavelength band to generate second wavelength multiplexed light in a first polarization. The wavelength converter converts a wavelength of the second wavelength multiplexed light from the first wavelength band into a second wavelength band by a cross phase modulation among the second wavelength multiplexed light, first pump light in a second polarization and second pump light in the second polarization. The second polarization is orthogonal to the first polarization. The third wavelength multiplexer multiplexes the second wavelength multiplexed light whose wavelength has been converted by the wavelength converter and the first wavelength multiplexed light.
-
公开(公告)号：US11228367B2
公开(公告)日：2022-01-18
申请号：US16679775
申请日：2019-11-11
申请人： FUJITSU LIMITED
发明人： Takahito Tanimura , Takeshi Hoshida
IPC分类号： H04B10/079 , H04Q11/00
摘要： A communication device used in an optical communication system, the communication device includes a mode change over device configured to switch between a learning mode for learning a normal state of an optical transmission path before operation and a monitoring mode for monitoring a state of the optical transmission path during operation, an anomaly detector configured to detect an anomaly of the optical transmission path using a prediction model determined by the learning mode when the monitoring mode is selected, and a data writer configured to extract waveform data including information related to the anomaly to output the extracted waveform data to an outside when the anomaly is detected.
-
公开(公告)号：US10999659B2
公开(公告)日：2021-05-04
申请号：US16937707
申请日：2020-07-24
申请人： FUJITSU LIMITED
摘要： An optical network device receives an optical signal, to which polarization information is added, from a transmitter via a transmission line. The receiver generates electric-field-information signal of the optical signal. The processor acquires, for respective polarization rotation amounts, the electric-field-information signal during a period specified by the polarization information. The processor calculates, for respective polarization rotation amounts and based on the electric-field-information signal, evaluation values corresponding to powers of the optical signal at a plurality of positions on the transmission line. The processor calculates, for respective positions, variations in the evaluation values corresponding to the polarization rotation amounts. The processor output information that indicates a first position when the variation in the evaluation values for the first position is larger than that for a second position where the second position is adjacent to the first position on a transmitter side.
-
公开(公告)号：US20200036446A1
公开(公告)日：2020-01-30
申请号：US16506199
申请日：2019-07-09
申请人： FUJITSU LIMITED
发明人： Yi Ge , Shoichiro Oda , YUICHI AKIYAMA , Takeshi Hoshida
IPC分类号： H04B10/294 , H04J14/02 , H04L25/03 , H04B10/075
摘要： An optical transmission device includes: a frontend circuit, a converter, an equalizer, a recovery, spectrum detector a correction information generator, and a transmitter. The frontend circuit converts an optical signal received via an optical network into an electric signal. The converter converts an output signal of the frontend circuit into a digital signal. The equalizer equalizes the digital signal or a second digital signal that is generated based on the digital signal. The recovery recovers a symbol from an output signal of the equalizer. The spectrum detector detects a reception spectrum of the optical signal based on the digital signal or the second digital signal. The correction information generator generates, according to the reception spectrum, correction information for correcting a shape of a transmission spectrum of the optical signal. The transmitter transmits the correction information to the source device.
-
公开(公告)号：US10396900B2
公开(公告)日：2019-08-27
申请号：US15923129
申请日：2018-03-16
申请人： FUJITSU LIMITED
IPC分类号： H04B10/2569 , H04B10/2507 , H04B10/564 , H04B10/50 , H04B10/532 , H04J14/08 , H04B10/61
摘要： A method of controlling a transmission signal, includes transmitting a training signal including four polarization states having a given relation; and performing rotation control and transmission power level control of a polarization component of a data signal, based on a rotation control matrix for a polarization state and an inverse-operation control matrix for a power level imbalance, which are estimated from Stokes parameters related to input power level present on a Poincare sphere acquired from the training signal and Stokes parameters related to output power level present on the Poincare sphere.
-
37.发明申请公开(公告)号：US20190165865A1
公开(公告)日：2019-05-30
申请号：US16171250
申请日：2018-10-25
申请人： FUJITSU LIMITED
发明人： GOJI NAKAGAWA , Kyosuke Sone , Yoshio Hirose , Takeshi Hoshida , Setsuo Yoshida
IPC分类号： H04B10/572 , H04J14/02 , H04B10/27
摘要： An optical transmission apparatus includes a wavelength variable filter whose transmission light wavelength is variable; a receiver that receives light, the light being sent from another optical transmission apparatus and passing through the wavelength variable filter; a transmitter that sends to the another optical transmission apparatus, a utilization permission request for a second wavelength corresponding to a first wavelength of the light received by the receiver, the transmitter sending the utilization permission request as light of the second wavelength and in a form of a tone signal of a predetermined frequency; and a controller that, when receiving from the another optical transmission apparatus, a utilization permission notification of the second wavelength for a sender of the utilization permission request, configures a wavelength of a main signal to the second wavelength, the main signal being sent from the transmitter to the another optical transmission apparatus.
-
公开(公告)号：US10256903B2
公开(公告)日：2019-04-09
申请号：US15821018
申请日：2017-11-22
申请人： FUJITSU LIMITED
发明人： Shoichiro Oda , Yasuhiko Aoki , Takeshi Hoshida , Hisao Nakashima , Hiroki Oi
IPC分类号： H04B10/079 , H04L27/00 , H04J14/06 , H04B10/564 , H04J14/02
摘要： A network controller includes: a first acquisition unit configured to acquire, based on a signal quality amount of each of wavelength paths set in a network of an optical wavelength-multiplexed transmission system, a signal quality amount of each of spans in each of the wavelength paths; an arithmetic unit configured to calculate a signal quality amount of each of spans in a wavelength path of an estimation target, based on the signal quality amount acquired by the first acquisition unit; and an estimation unit configured to estimate a signal quality amount of the wavelength path of the estimation target, based on the signal quality amount calculated by the arithmetic unit.
-
公开(公告)号：US20190081701A1
公开(公告)日：2019-03-14
申请号：US16110451
申请日：2018-08-23
申请人： FUJITSU LIMITED
发明人： Shoichiro Oda , Takeshi Hoshida , Hisao Nakashima , Yi Ge
IPC分类号： H04B10/079 , H04L1/20
CPC分类号： H04B10/07953 , H04L1/20 , H04L1/205
摘要： A transmission device includes: a receiving unit that receives an optical signal; an acquiring unit that acquires spectrum information from the optical signal, the spectrum information relating to a spectrum of the optical signal; and a narrowing calculating unit that calculates an index value for narrowing of a band of the optical signal by calculating a sampling timing error in accordance with the spectrum information, the sampling timing error being an error when a clock signal is extracted from the optical signal.
-
公开(公告)号：US20190028205A1
公开(公告)日：2019-01-24
申请号：US16035650
申请日：2018-07-15
申请人： FUJITSU LIMITED
发明人： GUOXIU HUANG , Hisao Nakashima , YUICHI AKIYAMA , Takeshi Hoshida
IPC分类号： H04B10/564 , H04B10/079 , H04B10/516
CPC分类号： H04B10/564 , H04B10/07955 , H04B10/50572 , H04B10/516 , H04B10/532 , H04B10/5561
摘要： An optical transmitter includes, a processor that receives an input data signal from an outside and performs rotation processing for periodically or repeatedly rotating a polarization state or phase of the optical output signal upon the input data signal, an optical modulator that modulates light transmitted from a light source based on the input data signal, a digital-to-analog converter that converts an output of the processor into an analog electric signal, a driving circuit that amplifies an output of the digital-to-analog converter and drives the optical modulator, and a monitoring control circuit that monitors an optical output signal output from the optical modulator and adjusts at least one of an output of the digital-to-analog converter and a gain of the driving circuit based on a result of monitoring of the optical output signal.
-
-
-
-
-
-
-
-
-
搜索结果
151 条记录 (耗时 0.03 秒)
