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公开(公告)号：US11990727B2
公开(公告)日：2024-05-21
申请号：US16978460
申请日：2018-03-07
申请人： NEC Corporation
IPC分类号： H01S3/13 , H01S3/067 , H01S3/094 , H01S3/10 , H01S3/23 , H04B10/25 , H04B10/294 , H04B10/572 , H04B10/66 , H04J14/02
CPC分类号： H01S3/1301 , H01S3/06737 , H01S3/06754 , H01S3/094007 , H01S3/094069 , H01S3/10015 , H01S3/1003 , H01S3/1305 , H01S3/2391 , H04B10/25 , H04B10/2942 , H04B10/572 , H04B10/66 , H04J14/02
摘要： It is difficult to flatten the gain profile of an optical amplifier without increasing the power consumption, the cost, and the size of the optical amplifier; therefore, a monitoring apparatus for optical amplifier according to an exemplary aspect of the invention includes an optical filtering means for receiving a monitor light beam of the optical amplifier and transmitting a filtered monitor light beam with a set range of wavelength band; a photoelectric conversion means for converting the filtered monitor light beam into a monitoring signal; and a spectrum information generating means for generating spectrum information based on the monitoring signal, the spectrum information including information on a spectrum profile of output of the optical amplifier.
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公开(公告)号：US12027813B2
公开(公告)日：2024-07-02
申请号：US17044088
申请日：2019-04-08
申请人： NEC Corporation
CPC分类号： H01S3/094015 , H01S3/06716 , H01S3/06733 , H01S3/06737 , H01S3/06754 , H01S3/094007 , H01S3/094053 , H01S3/1001 , H01S3/1608
摘要： In optical amplifiers that use a multicore optical fiber, the absorption efficiency of excitation light in an optical amplification medium is low and the amplification efficiency of light intensity becomes lower in the cladding excitation method; therefore, an optical amplification apparatus according to the present invention includes an optical amplification medium, having a gain in a wavelength band of signal light, configured to receive the signal light; excitation light introduction means for introducing, into the optical amplification medium, excitation light to excite the optical amplification medium; and residual excitation light introduction means for introducing, into the optical amplification medium, residual excitation light output from the optical amplification medium, the residual excitation light having a wavelength component of the excitation light.
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3.发明授权公开(公告)号：US11876339B2
公开(公告)日：2024-01-16
申请号：US17043488
申请日：2018-03-30
申请人： NEC Corporation
CPC分类号： H01S3/1001 , H01S3/06737 , H01S3/06754 , H01S3/094007 , H01S3/094049 , H01S3/10015 , H04B10/2581 , H04B10/50 , H04B10/61 , H01S2301/02
摘要： A pumping light source outputs pumping lights. A pumping light source outputs a pumping light. Optical multiplexers couple the pumping lights to a plurality of cores. The optical multiplexer couples the pumping light to the clad. A pumping light source drive unit drives a pumping light source. A pumping light source drive unit drives a pumping light source. A monitoring unit outputs a monitoring signal indicating a monitoring result of the number of wavelengths used in each of optical signals amplified by the plurality of the cores. The control unit controls the power of the pumping lights based on the monitoring signal. The control unit controls the power of each of the pumping lights in accordance with the number of wavelengths used in each of the optical signals and controls the power of the pumping light so that signal qualities of the optical signals fall within a prescribed range.
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公开(公告)号：US10205528B2
公开(公告)日：2019-02-12
申请号：US15558799
申请日：2015-03-20
申请人： NEC Corporation
IPC分类号： H04B10/04 , H04B10/516 , H04B10/588
摘要： It is impossible to compensate non-linearity in an optical transmitter during operations, therefore, an optical transmitter according to an exemplary aspect of the invention includes a selective addition means for adding a coefficient to digital data to be transmitted if the digital data being included in one of data intervals of predetermined number, the predetermined number being integer more than one, and for changing the coefficient with a period longer than the symbol period of the data transmitted by the optical transmitter; a data processing means for processing the digital data by using a parameter; a driving signal means for generating a driving signal from the digital data adjusted by the selective addition means and the data processing means; a modulating means for modulating light into lightwave signal by the driving signal; and a control means for receiving a monitor signal obtained by monitoring the lightwave signal having a frequency component determined by the period of changing the added coefficients, and for modifying the parameter of the data processing means in order for the monitor signal to reach an extremum.
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公开(公告)号：US12072243B2
公开(公告)日：2024-08-27
申请号：US17797843
申请日：2021-02-15
申请人： NEC Corporation
IPC分类号： G01K11/3206 , G02B6/02
CPC分类号： G01K11/3206 , G02B6/02042
摘要： Provided are a monitoring device, a monitoring method, and an optical transmission system which are adapted for an increase in the number of cores of a multi-core optical fiber transmission path and suitable for crosstalk monitoring. The monitoring device monitors a multi-core optical fiber transmission path having a plurality of use cores and at least one or more non-use cores, and comprises: an applying means for applying, at a start point of the multi-core optical fiber transmission path, dithering to signal light propagating in the use cores; a monitoring means for monitoring the power of the non-use cores at an input side of a relay in the multi-core optical fiber transmission path; and a separating means for separating a monitoring result from the monitoring means into power components from the plurality of use cores.
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公开(公告)号：US11870208B2
公开(公告)日：2024-01-09
申请号：US16976162
申请日：2019-03-06
申请人： NEC Corporation
IPC分类号： H01S3/091 , H01S3/067 , H01S3/094 , H01S3/0941
CPC分类号： H01S3/0912 , H01S3/06754 , H01S3/0941 , H01S3/094007 , H01S3/094015 , H01S3/06737
摘要： Provided are a low-cost and low power-consumption optical fiber amplifier, an optical fiber amplifier control method, and a transmission system. The optical fiber amplifier comprises: an optical fiber to which pumping light is supplied and which amplifies an optical signal, the optical fiber including a plurality of cores in a cladding; a light source which outputs the pumping light; a combining means which supplies the pumping light from the light source to the cladding of the optical fiber and causes the pumping light to be combined with the optical signal; a collect means which collects, without collecting the signal light, pumping light among the supplied pumping light that has not been absorbed by the optical fiber; a monitor means which monitors residual pumping light that has passed through the optical fiber and collected by the collect means; and a control means which controls the state of the pumping light.
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公开(公告)号：US10567078B2
公开(公告)日：2020-02-18
申请号：US16070541
申请日：2016-01-18
申请人： NEC Corporation
IPC分类号： H04B10/08 , H04B10/079 , H04B10/50 , H04J14/02
摘要： An optical transmitter using multiplexed optical signals increases in cost and in size in order to control an optical carrier frequency with high precision, therefore, an optical transmitter according to an exemplary aspect of the invention includes optical signal generating means for adding a first optical component to a first optical carrier and adding a second optical component to a second optical carrier; multiplexing means for multiplexing the first optical carrier and the second optical carrier to generate a multiplexed optical signal; monitoring means for monitoring the multiplexed optical signal to detect a monitor signal having a difference frequency between the first optical component and the second optical component; and controlling means for controlling a carrier frequency of at least one of the first optical carrier and the second optical carrier according to the monitor signal.
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公开(公告)号：US10191307B2
公开(公告)日：2019-01-29
申请号：US15559165
申请日：2016-03-18
申请人： NEC Corporation
IPC分类号： G02F1/01 , H04B10/516 , G02F1/225 , H04B10/556 , G02F1/21
摘要： To provide a modulation control method and an optical transmission device that realize high reliability by more stably performing bias control of an optical modulator using an optical QAM scheme, an optical transmitter according to the present invention comprises a first waveguide and a second waveguide, wherein each of the first waveguide and the second waveguide are provided with an optical modulator that modulates a carrier light with a modulation driving signal that has multiple strength level values, a phase shift unit that provides a predetermined phase difference between a first optical signal outputted from the first waveguide and a second optical signal outputted from the second waveguide, a light detector that detects and photoelectrically converts a portion of a multiple value optical signal obtained by multiplexing the first optical signal and the second optical signal which have been provided with the phase difference and a control circuit that, on the basis of signal amplitude information obtained by a signal amplitude detector from wideband signal components from the light detector, corrects a first voltage provided to the first waveguide and corrects a second voltage provided to the second waveguide.
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公开(公告)号：US09819525B2
公开(公告)日：2017-11-14
申请号：US14906632
申请日：2013-07-31
申请人： NEC Corporation
IPC分类号： H04L25/06 , H04L27/20 , H04B10/50 , H04B10/556
CPC分类号： H04L27/2096 , H04B10/5057 , H04B10/50575 , H04B10/50595 , H04B10/5561 , H04L25/06
摘要： To provide signal generating apparatus that is capable of controlling the DC bias of the optical modulator applicable to various kinds of modulation format, a signal processing apparatus includes a digital processing unit for deserializing an input digital data into parallel data lanes, for comparing the value of the digital data of symbol rate F to at least one predetermined threshold value, for selecting an offset value based on the result of the comparison; and for adding the selected offset value to the digital data, a converting unit for converting the digital data added the offset value to analog signals in each lane; an optical modulating unit for modulating a lightwave according to the analog signals with predetermined modulation format at the symbol rate F, where the modulated signal contains a frequency component at F/N.
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公开(公告)号：US11824320B2
公开(公告)日：2023-11-21
申请号：US17431822
申请日：2020-02-19
申请人： NEC Corporation
CPC分类号： H01S3/0912 , H01S3/0014 , H01S3/06737 , H01S3/06754 , H01S3/10069 , H04B10/25
摘要： An optical amplifier uses, in a gain medium, a multicore optical fiber having a plurality of cores, and comprises: an input-light power monitor that monitors the optical power of input light to the plurality of cores of the multicore optical fiber; an output-light power monitor that monitors the optical power of medium-passed output light from the plurality of cores that has passed through the multicore optical fiber; a crosstalk monitor that monitors the amount of inter-core crosstalk among the plurality of cores; and a controller that controls the pump-light power of pump light superimposed on the input light to the plurality of cores on the basis of the monitored optical power of input light, the monitored optical power of output light, and the monitored amount of inter-core crosstalk.
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