公开(公告)号：US20230318710A1

公开(公告)日：2023-10-05

申请号：US18126663

申请日：2023-03-27

Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION NATIONAL INSTITUTES OF NATURAL SCIENCES

Inventor： Hitoshi KIUCHI

IPC: H04B10/2575 ,  H04B10/548 ,  H04B10/67 ,  H04B10/50

CPC classification number: H04B10/25753 ,  H04B10/548 ,  H04B10/676 ,  H04B10/50597 ,  H04B10/50577

Abstract: A forward optical intensity modulation signal, generated by optical intensity-modulating a laser signal using a forward microwave phase modulation signal, is transmitted from a base to a remote station. A backward microwave phase modulation signal, in which frequency of the forward microwave phase modulation signal is changed by demodulating the forward optical intensity modulation signal, is generated, and a backward optical intensity modulation signal, generated by optical intensity-modulating the laser signal using the backward microwave phase modulation signal, is transmitted from the remote station to the base. The backward microwave phase modulation signal is extracted by photoelectric converting the backward optical intensity modulation signal, a round trip timing is extracted by demodulating the backward microwave phase modulation signal, and transmission delay is determined from a difference between the timing and the round trip timing.

公开(公告)号：US20170180054A1

公开(公告)日：2017-06-22

申请号：US15296919

申请日：2016-10-18

Applicant: NATIONAL INSTITUTES OF NATURAL SCIENCES

Inventor： Hitoshi KIUCHI

IPC: H04B10/572 ,  G01J1/42 ,  G02F1/225 ,  H04B10/50 ,  H04B10/516

CPC classification number: H04B10/572 ,  G01J1/4228 ,  G01J3/108 ,  G02F1/2255 ,  G02F2001/212 ,  G02F2203/56 ,  H04B10/503 ,  H04B10/516 ,  H04B10/90 ,  H04B2210/006

Abstract: In an optical synthesizer, a laser source outputs a laser. An optical modulator modulates the frequency of the laser to output a light including a first frequency component. An optical filter extracts the first frequency component from the output of the optical modulator. An optical comb generator generates an optical comb based on the laser and a predetermined driving signal. A variable-wavelength narrowband filter extracts a second frequency component from the optical comb. An optical-electric converter outputs an electric signal based on the frequency difference between the first and second frequency components.

公开(公告)号：US20180356598A1

公开(公告)日：2018-12-13

申请号：US16001951

申请日：2018-06-07

Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION, NATIONAL INSTITUTES OF NATURAL SCIENCES ,  NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY

Inventor： Hitoshi KIUCHI ,  Atsushi KANNO ,  Tetsuya KAWANISHI

IPC: G02B6/35 ,  G01L1/24 ,  H04J14/02 ,  H04B10/00 ,  H04B10/50 ,  H04Q11/00

CPC classification number: G02B6/3586 ,  G01L1/246 ,  H04B10/12 ,  H04B10/506 ,  H04J14/02 ,  H04Q11/0001

Abstract: To provide a method for performing phase control of coherent two light wave signals while maintaining coherence in the state of the light signal, and a device which realizes such a method, there is provided, as illustrated in FIG. 1, a phase adjustment device 1 for two light waves including: a two light wave source 3, a wavelength separator 5, a first phase modulator 7, and a second phase modulator 9, whereby coherent two light waves are used as input signals to perform wavelength separation of those input signals thereafter to control optical phases of the respective light signals thereafter to multiplex them by using a multiplexer 11, thus to be able to obtain an output signal of which optical phase has been adjusted.

公开(公告)号：US20170214464A1

公开(公告)日：2017-07-27

申请号：US15296927

申请日：2016-10-18

Applicant: NATIONAL INSTITUTES OF NATURAL SCIENCES

Inventor： Hitoshi KIUCHI

IPC: H04B10/25 ,  H04L7/00 ,  H04B10/69

CPC classification number: H04B10/2504 ,  H04B10/00 ,  H04B10/691 ,  H04L7/0075

Abstract: An optical oscillator 10 combines optical signals L1′ and L2 to generate an optical signal L3. The optical signal L1′ includes light waves W1′ and W2′ having frequencies spaced apart by a frequency difference Δf1. The optical signal L2 includes light waves W3 and W4 having frequencies spaced apart by a frequency difference Δf2. The optical oscillator 10 separates the optical signal L3 into optical signals L4 and L5, wherein the optical signal L4 includes the light waves W1′ and W3 and the optical signal L5 includes the light waves W2′ and W4. The optical oscillator 10 compares the frequency differences Δf1 and Δf2 based on frequency difference Δf3 between the light waves W1′ and W3 included in the optical signal L4 and frequency difference Δf4 between the light waves W2′ and W4 included in the optical signal L5.