公开(公告)号：US20190250484A1

公开(公告)日：2019-08-15

申请号：US16336467

申请日：2017-09-12

Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY

Inventor： Takahide SAKAMOTO ,  Naokatsu YAMAMOTO ,  Atsushi MATSUMOTO

IPC: G02F2/02 ,  G02F1/01

CPC classification number: G02F2/02 ,  G02F1/0123 ,  G02F2203/56

Abstract: 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.

公开(公告)号：US20190020319A1

公开(公告)日：2019-01-17

申请号：US16069457

申请日：2017-01-10

Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY

Inventor： Toshimasa UMEZAWA ,  Kouichi AKAHANE ,  Atsushi MATSUMOTO ,  Atsushi KANNO ,  Naokatsu YAMAMOTO ,  Tetsuya KAWANISHI

IPC: H03F3/19 ,  H03F3/08 ,  H03F1/02 ,  H04B10/69

Abstract: There is provided a photoelectric converter that converts an optical signal into an electrical signal for amplification, the photoelectric converter including a photoelectric conversion element that converts the optical signal into an electrical signal and outputs the electrical signal from an output terminal, a high-frequency amplifier that includes an input terminal of an electrical signal output from the output terminal and a DC cut-off capacitor which is disposed at an output stage of the input terminal and is serially connected to the input terminal and that amplifies the electrical signal, and an inductance element that is disposed between a bias power supply applying bias voltage or bias current to the photoelectric conversion element and the input terminal and which is connected in parallel to the DC cut-off capacitor.

公开(公告)号：US20180375291A1

公开(公告)日：2018-12-27

申请号：US16008261

申请日：2018-06-14

Applicant: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY

Inventor： Atsushi MATSUMOTO ,  Kouichi AKAHANE ,  Naokatsu YAMAMOTO

IPC: H01S5/34 ,  H01S5/02 ,  H01S5/343

Abstract: A semiconductor optical device 1 includes an active layer 4 provided on a substrate 2, a clad layer 5 provided on the active layer 4, and a contact layer 7 provided on the clad layer 5. The contact layer 7 contains a first impurity and a second impurity different from the first impurity. A semiconductor light source includes the active layer 4 provided on the substrate 2, the clad layer 5 provided on the active layer 4, and the contact layer 7 provided on the clad layer 5. The contact layer 7 contains the first impurity and the second impurity different from the first impurity.