公开(公告)号：US20200272018A1

公开(公告)日：2020-08-27

申请号：US16738450

申请日：2020-01-09

Applicant: Fujitsu Optical Components Limited

Inventor： Manabu WATANABE

IPC: G02F1/225 ,  G02F1/01

Abstract: A Mach-Zehnder optical modulator creates a first driving signal to be applied to a first section, and a second driving signal to be applied to a second section, and includes a generator, an optical modulator, and a setting unit. The generator generates a first dither signal and a second dither signal. The optical modulator optical modulates an optical signal into a quaternary or more value optical modulation signal by applying the first driving signal superimposed by the first dither signal, and by applying the second driving signal superposed by the second dither signal. The setting unit sets, when a length of the second section is n times as long as the first section, the first dither signal and the second dither signal to have a same phase, and sets such that an amplitude of the first dither signal is n times as large as that of the second dither signal.

公开(公告)号：US10754179B2

公开(公告)日：2020-08-25

申请号：US16515573

申请日：2019-07-18

Applicant: Fujitsu Optical Components Limited

Inventor： Yasuhiro Ohmori ,  Yoshinobu Kubota ,  Masaharu Doi ,  Shintaro Takeuchi ,  Yoshihiko Yoshida

IPC: G02F1/035 ,  G02F1/225 ,  G02F1/21 ,  G02B6/12

Abstract: An optical modulator includes an optical waveguide of a ridge type formed of a thin film of a dielectric material having an electro-optic effect over a substrate, a buffer layer covering the optical waveguide, and a signal electrode provided over the optical waveguide via the buffer layer, wherein a width of the signal electrode is greater than a ridge width of the optical waveguide and wherein the signal electrode covers at least one of sidewalls of a ridge of the optical waveguide.

公开(公告)号：US20200177281A1

公开(公告)日：2020-06-04

申请号：US16667337

申请日：2019-10-29

Applicant: Fujitsu Optical Components Limited

Inventor： Yamato IWAMA ,  Mai Luan Nguyen ,  Masato Nishihara ,  Toshiki Tanaka

IPC: H04B10/516 ,  H04B10/66

Abstract: An optical transmission device includes a light source that is driven according to a multicarrier modulation signal in which data is allocated to a plurality of subcarriers to transmit an optical multicarrier modulation signal to another optical transmission device, and a control unit that controls a driving condition of the light source, based on the number of bits allocatable to each of the subcarriers of the multicarrier modulation signal, the number of bits being determined according to transmission characteristics of the optical multicarrier modulation signal in the other optical transmission device.

公开(公告)号：US20200064404A1

公开(公告)日：2020-02-27

申请号：US16503696

申请日：2019-07-05

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G01R31/3185 ,  G01R31/28 ,  H04B10/40 ,  G02B27/28

Abstract: An optical device is formed on an optical IC chip. The shape of the optical IC chip is rectangular or parallelogram. The optical device induces: an optical device circuit; a first optical waveguide that is coupled to the optical device circuit; a pad that is electrically connected to the optical device circuit; a grating coupler; and a second optical waveguide that is coupled to the grating coupler. The pad is formed in a region close to a first side of the optical IC chip. The grating coupler is formed in a specified region, which is not close to the first side, on the optical IC chip. The first optical waveguide and the second optical waveguide are respectively extended to an edge of the optical IC chip.

公开(公告)号：US10560213B2

公开(公告)日：2020-02-11

申请号：US16369259

申请日：2019-03-29

Applicant: Fujitsu Optical Components Limited

Inventor： Shuntaro Makino ,  Kazumasa Takabayashi

IPC: H04J14/06 ,  G02B27/28 ,  G02F1/225 ,  H04B10/40 ,  G02F1/21

Abstract: An optical device includes an optical coupler that performs branching of the input light and outputs a first-type branched light and a second-type branched light; a polarization converter that changes the direction of polarization of the second-type branched light output from the optical coupler; and a polarization synthesizer that outputs a polarization multiplexed light by synthesizing the first-type branched light, which is output from the optical coupler, and the second-type branched light, which has the direction of polarization changed by the polarization converter. The optical coupler has the wavelength characteristic that cancels out the wavelength characteristic of the polarization synthesizer regarding the second-type branched light included in the polarization multiplexed light.

公开(公告)号：US20200041824A1

公开(公告)日：2020-02-06

申请号：US16515573

申请日：2019-07-18

Applicant: Fujitsu Optical Components Limited

Inventor： Yasuhiro OHMORI ,  Yoshinobu KUBOTA ,  Masaharu DOI ,  Shintaro TAKEUCHI ,  Yoshihiko YOSHIDA

IPC: G02F1/035 ,  G02F1/225

Abstract: An optical modulator includes an optical waveguide of a ridge type formed of a thin film of a dielectric material having an electro-optic effect over a substrate, a buffer layer covering the optical waveguide, and a signal electrode provided over the optical waveguide via the buffer layer, wherein a width of the signal electrode is greater than a ridge width of the optical waveguide and wherein the signal electrode covers at least one of sidewalls of a ridge of the optical waveguide.

公开(公告)号：US10551642B2

公开(公告)日：2020-02-04

申请号：US16050347

申请日：2018-07-31

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02F1/01

Abstract: A tunable light source includes a substrate; a light source; a wavelength selecting device that selects, according to a control signal, output light with a specific wavelength from light output from the light source; a wavelength filter that is disposed on the substrate, filters the output light, and outputs the filtered light; a light-receiving device that receives the filtered light from the wavelength filter; and a controller configured to generate the control signal based on an output transmittance corresponding to a quantity of the received light received by the light-receiving device, a first transmittance corresponding to a target wavelength, a second transmittance corresponding to a shorter-wavelength limit of a control range including the target wavelength, and a third transmittance corresponding to a longer-wavelength limit of the control range, and output the generated control signal to the wavelength selecting device.

公开(公告)号：US10509166B2

公开(公告)日：2019-12-17

申请号：US16048753

申请日：2018-07-30

Applicant: Fujitsu Optical Components Limited

Inventor： Masaki Sugiyama

IPC: G02B6/12 ,  G02B6/293

Abstract: A tunable optical source includes a substrate, a light source disposed on the substrate, and a wavelength selecting element configured to select light of a specific wavelength as output light, from light emitted from the light source, in accordance with a control signal. On the substrate, a wavelength filter including multiple output ports and a photodetector are disposed. The wavelength filter is configured to receive a part of the output light and to output light beams to the respective output ports. The photodetector is configured to receive the light beam output from one of the output ports. The tunable optical source further includes an inspection waveguide connecting to the photodetector at one end, and an inspection light input unit for inputting inspection light provided at the other end of the inspection waveguide.

公开(公告)号：US10471683B2

公开(公告)日：2019-11-12

申请号：US16166438

申请日：2018-10-22

Applicant: Fujitsu Optical Components Limited

Inventor： Kazuyuki Wakabayashi ,  Toshihiro Ohtani

IPC: H01L23/373 ,  B23B9/00 ,  B32B9/00 ,  B32B3/02 ,  B32B7/12 ,  H05K7/20 ,  H05K1/02 ,  H01L23/367

Abstract: A disclosed electronic device includes a graphite laminate having a plurality of layers laminated in a first direction, each layer containing graphite, where the graphite laminate has a portion in a stepwise form in which edges of the plurality of layers are offset from each other.

公开(公告)号：US10419153B2

公开(公告)日：2019-09-17

申请号：US16139503

申请日：2018-09-24

Applicant: Fujitsu Optical Components Limited

Inventor： Kiyotoshi Noheji ,  Masato Nishihara

IPC: H04J14/02 ,  H04B10/572 ,  H04L27/26

Abstract: An optical transmitter includes: a light source; a wavelength detecting unit configured to detect a wavelength of light emitted from the light source; a wavelength difference information generating unit configured to generate wavelength difference information representing a wavelength difference between a predetermined reference wavelength and a wavelength of the light detected by the wavelength detecting unit; a subcarrier count determination unit configured to determine a number of subcarriers to be used, based on the wavelength difference indicated by the wavelength difference information; a multi-valued level determination unit configured to determine, for each of the subcarriers, a multi-valued level which is a number of bits transmitted by a corresponding subcarrier of the subcarriers; a modulated signal generating unit configured to generate a modulated signal by modulating the subcarriers such that each of the subcarriers has the determined multi-valued level.