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1. 发明授权

US10514587B2 Interval control-type optical comb 有权
公开(公告)号：US10514587B2
公开(公告)日：2019-12-24
申请号：US16336467
申请日：2017-09-12
申请人： NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
发明人： Takahide Sakamoto , Naokatsu Yamamoto , Atsushi Matsumoto
IPC分类号： G02F2/02 , G02F1/01
摘要： To provide an optical comb generation device and an optical comb signal generation method capable of stably generating an optical comb signal having an optical frequency interval exceeding the drive electric signal band of a modulator. When light output from a first optical modulator 5 and a second optical modulator 7 is multiplexed in a multiplexing unit 13, the first optical modulator 5 and the second optical modulator 7 cancel the even-ordered components or odd-ordered components included in the light output from the first optical modulator 5 and the second optical modulator 7 and, when light output from a third optical modulator 9 and a fourth optical modulator 11 is multiplexed in the multiplexing unit 13, the third optical modulator 9 and the fourth optical modulator 11 cancel the even-ordered components or odd-ordered components included in the light output from the third optical modulator 9 and the fourth optical modulator 11, wherein the same components cancelled in the light output from the first optical modulator 5 and the second optical modulator 7 are cancelled.

2. 发明授权

US09954615B2 Optical up/down conversion-type optical phase conjugate pair signal transmission/reception circuit 有权
公开(公告)号：US09954615B2
公开(公告)日：2018-04-24
申请号：US15514529
申请日：2015-09-02
申请人： NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
发明人： Takahide Sakamoto
IPC分类号： H04B10/2507 , G02F1/225 , H04B10/516 , H04B10/58 , G02F1/21
CPC分类号： H04B10/2507 , G02F1/01 , G02F1/2255 , G02F2/00 , G02F2001/212 , H04B10/2543 , H04B10/2575 , H04B10/516 , H04B10/58
摘要： To provide a method capable of easily compensating waveform distortion due to a non-linear effect caused by a complicated electric circuit, and a device for implementing the method. Provided are a method capable of effectively compensating signal degradation such as waveform distortion due to a nonlinear effect caused by an optical fiber that is an optical transfer path using an optical phase conjugate signal pair at the time of optical up-conversion or down-conversion, and a device capable of implementing the method. This emission device 25 includes an optical modulator 11, a signal source 13, an optical fiber 15, a multiplexing unit 17, a multiplexing local signal source 19, an optical detector 12, and a transmission antenna 23.

3. 发明授权

US10944481B2 Coherent sampling 有权
公开(公告)号：US10944481B2
公开(公告)日：2021-03-09
申请号：US16305057
申请日：2017-05-12
申请人： NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
发明人： Takahide Sakamoto
IPC分类号： H04B10/61 , G01M11/02 , G01R13/02 , G01R13/34 , H04B10/079 , H04L27/26
摘要： To realize sampling (signal measurement) and analysis of a signal to be measured easily at low cost by capturing optical phase fluctuation even when low-speed sampling is carried out. This sampling method includes: a step for acquiring main sampling points at a repetition period equal to or less than a half of the band frequency of a signal to be measured; a step for acquiring sub-sampling points by executing sampling separately from that executed for the main sampling points; a step for acquiring an amplitude difference, a phase difference, and a frequency difference between the signal to be measured at each of the sub-sampling points and a reference signal; a step for acquiring a time difference, an amplitude difference (ΔA), a phase difference (Δφ), and a frequency difference (Δf) between each of the main sampling points and each of the sub-sampling points; and a step for acquiring the amplitude fluctuation, the phase fluctuation, and the frequency fluctuation of the signal to be measured by using the time difference (Δt), the amplitude difference (ΔA), the phase difference (Δφ), and the frequency difference (Δf) between each of the main sampling points and each of the sub-sampling points.

4. 发明授权

US10911153B2 High-speed photodetector array 有权
公开(公告)号：US10911153B2
公开(公告)日：2021-02-02
申请号：US16494766
申请日：2018-03-07
申请人： NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
发明人： Toshimasa Umezawa , Takahide Sakamoto , Atsushi Kanno , Naokatsu Yamamoto , Tetsuya Kawanishi
IPC分类号： H04B10/00 , H04B10/60 , G02B6/42 , H01L27/144 , H04B10/2581 , H04J14/04
摘要： To provide a photodetector which enables reception of massively parallel optical communication, and with which a large volume of data for multi-mode transmission or multi-core transmission can be received instantaneously at once. A photodetector comprising a two-dimensional photodetector array in which a plurality of photodetectors 9 are arranged in a two-dimensional array, and which includes a wire 12 having a width of not more than 4 μm between the plurality of photodetectors. Each of the photodetectors has a light reception area with a side measuring not more than 100 μm. The plurality of photodetectors arranged in a two-dimensional array are spaced apart from each other by not less than 20 μm.

5. 发明授权

US10090918B2 Collective acquisition-type photodetection device and photodetection method having a time delay adjustment unit wherein each time-adjusted optical signal train is photomixed with an optical frequency comb at different timings in a photomixer 有权
公开(公告)号：US10090918B2
公开(公告)日：2018-10-02
申请号：US15323728
申请日：2015-06-02
申请人： NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY
发明人： Takahide Sakamoto
IPC分类号： G01J11/00 , H04B10/079 , G01J1/44 , G01J1/42
摘要： To realize collective measurement of ultrawide-band optical signals which have exceeded an electrical band limit. This photodetection device (100) comprises: a time-delay adjustment means (10) into which is input an optical signal that is a detection object; an optical frequency comb generator (20) that generates an optical frequency comb; a photomixer (30) that photomixes optical signal series which are sequentially output from the time delay adjustment means (10) and which were subjected to time adjustment, and the optical frequency comb signal which is output from the optical frequency comb generator (20); and a photodetector (40) that detects the mixed signal output from the photomixer (30). The time delay adjustment means (10) performs time adjustment on the optical signal series so that each of the time adjusted optical signal series is photomixed with the optical frequency comb at different timings in the photomixer (30).

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