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公开(公告)号：US11086189B1
公开(公告)日：2021-08-10
申请号：US16739973
申请日：2020-01-10
Applicant: INPHI CORPORATION
Inventor： Xiaoguang Tu , Jie Lin , Masaki Kato
Abstract: A silicon optical modulator includes two silicon waveguide branches coupled between a 2×2 splitter at a common input end and a 2×2 splitter at a common output end. The modulator further includes at least one of the two silicon waveguide branches comprising a ridge-shape having a central portion of a height sandwiched in a width direction by a first side portion and a second side portion throughout a length of the waveguide. The central portion in each cross-section plane thereof includes a p-region and a n-region separated by a continuous borderline to form an irregular shaped PN junction. The borderline is configured to have at least one section-line with a sloped angle relative to the width direction and have a total border-length substantially longer than the height. The p-region is in contact with the first side portion and the n-region is in contact with the second side portion.
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公开(公告)号：US11002913B2
公开(公告)日：2021-05-11
申请号：US16835093
申请日：2020-03-30
Applicant: INPHI CORPORATION
Inventor： Xiaoguang Tu , Radhakrishnan L. Nagarajan , Masaki Kato
Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.
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公开(公告)号：US10527795B2
公开(公告)日：2020-01-07
申请号：US16157409
申请日：2018-10-11
Applicant: INPHI CORPORATION
Inventor： Xiaoguang Tu , Radhakrishnan L. Nagarajan , Masaki Kato
Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.
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公开(公告)号：US10310185B1
公开(公告)日：2019-06-04
申请号：US16033074
申请日：2018-07-11
Applicant: INPHI CORPORATION
Inventor： Jie Lin , Masaki Kato
Abstract: The present application discloses a Transverse Electric (TE) polarizer. The TE polarizer includes a silicon-on-insulator substrate having a silicon dioxide layer. The TE polarizer further includes a waveguide embedded in the silicon dioxide layer. Additionally, the TE polarizer includes a plate structure embedded in the silicon dioxide layer substantially in parallel to the waveguide with a gap distance. In an embodiment, the plate structure induces an extra transmission loss to a Transverse Magnetic (TM) mode in a light wave traveling through the waveguide.
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公开(公告)号：US10274680B2
公开(公告)日：2019-04-30
申请号：US16015854
申请日：2018-06-22
Applicant: INPHI CORPORATION
Inventor： Masaki Kato , Radhakrishnan L. Nagarajan
Abstract: An apparatus of polarization self-compensated delay line interferometer. The apparatus includes a first waveguide arm of a first material of a first length disposed between an input coupler and an output coupler and a second waveguide arm of the first material of a second length different from the first length disposed between the same input coupler and the same output coupler. The apparatus produces an interference spectrum with multiple periodic passband peaks where certain TE (transverse electric) and TM (transverse magnetic) polarization mode passband peaks are lined up. The apparatus further includes a section of waveguide of a birefringence material of a third length added to the second waveguide arm to induce a phase shift of the lined-up TE/TM passband peaks to a designated grid as corresponding polarization compensated channels of a wide optical band.
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Patent Agency Ranking
公开(公告)号：US10126629B1
公开(公告)日：2018-11-13
申请号：US15668584
申请日：2017-08-03
Applicant: INPHI CORPORATION
Inventor： Xiaoguang Tu , Radhakrishnan L. Nagarajan , Masaki Kato
Abstract: An optical dispersion compensator integrated with a silicon photonics system including a first phase-shifter coupled to a second phase-shifter in parallel on the silicon substrate characterized in an athermal condition. The dispersion compensator further includes a third phase-shifter on the silicon substrate to the first phase-shifter and the second phase-shifter through two 2×2 splitters to form an optical loop. A second entry port of a first 2×2 splitter is for coupling with an input fiber and a second exit port of a second 2×2 splitter is for coupling with an output fiber. The optical loop is characterized by a total phase delay tunable via each of the first phase-shifter, the second phase-shifter, and the third phase-shifter such that a normal dispersion (>0) at a certain wavelength in the input fiber is substantially compensated and independent of temperature.
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公开(公告)号：US10120259B2
公开(公告)日：2018-11-06
申请号：US15812551
申请日：2017-11-14
Applicant: INPHI CORPORATION
Inventor： Masaki Kato
Abstract: An apparatus for modulating a beam of light with balanced push-pull mechanism. The apparatus includes a first waveguide comprising a first PN junction on a substrate and a second waveguide comprising a second PN junction on the silicon-on-insulator substrate. The second PN junction is a replica of the first PN junction shifted with a distance. The apparatus further includes a first source electrode and a first ground electrode coupled respectively with the first PN junction and a second source electrode and a second ground electrode coupled respectively with the second PN junction. The apparatus additionally includes a third ground electrode disposed near the second PN junction at the distance away from the second ground electrode, wherein the first ground electrode, the second ground electrode, and the third ground electrode are commonly grounded to have both PN junctions subjected to a substantially same electric field varied in ground-source-ground pattern.
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公开(公告)号：US10031289B2
公开(公告)日：2018-07-24
申请号：US15088862
申请日：2016-04-01
Applicant: INPHI CORPORATION
Inventor： Masaki Kato , Radhakrishnan L. Nagarajan
Abstract: An apparatus of polarization self-compensated delay line interferometer. The apparatus includes a first waveguide arm of a first material of a first length disposed between an input coupler and an output coupler and a second waveguide arm of the first material of a second length different from the first length disposed between the same input coupler and the same output coupler. The apparatus produces an interference spectrum with multiple periodic passband peaks where certain TE (transverse electric) and TM (transverse magnetic) polarization mode passband peaks are lined up. The apparatus further includes a section of waveguide of a birefringence material of a third length added to the second waveguide arm to induce a phase shift of the lined-up TE/TM passband peaks to a designated grid as corresponding polarization compensated channels of a wide optical band.
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公开(公告)号：US09958614B2
公开(公告)日：2018-05-01
申请号：US15786156
申请日：2017-10-17
Applicant: INPHI CORPORATION
Inventor： Masaki Kato , Radhakrishnan L. Nagarajan
CPC classification number: G02B6/305 , G02B6/1228 , G02B6/136 , G02B6/26 , G02B2006/12061
Abstract: An apparatus for converting fiber mode to waveguide mode. The apparatus includes a silicon substrate member and a dielectric member having an elongated body. Part of the elongated body from a back end overlies the silicon substrate member and remaining part of the elongated body up to a front end is separated from the silicon substrate member by a second dielectric material at an under region. The apparatus also includes a waveguide including a segment from the back end to a tail end formed on the dielectric member at least partially overlying the remaining part of the elongated body. The segment is buried in a cladding overlying entirely the dielectric member. The cladding has a refractive index that is less than the waveguide but includes an index-graded section with decreasing index that is formed at least over the segment from the tail end toward the back end.
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40.发明授权公开(公告)号：US09864146B1
公开(公告)日：2018-01-09
申请号：US15356438
申请日：2016-11-18
Applicant: INPHI CORPORATION
Inventor： Pei-Keng Fu , Chris Kiyoshi Togami , Masaki Kato , Radhakrishnan L. Nagarajan
CPC classification number: G02B6/30 , G02B6/3636 , G02B6/3893
Abstract: An apparatus for handling a fiber-array to be attached with a silicon-photonics chip. The apparatus includes a bottom-plate having a first trench formed with two first branches connected to two first recessed regions at a first end and one second branch straight to a second end thereof and a second trench sharing the same second branch and having two third branches connected to two second recessed regions with an angle towards two sides outside the two first branches. The bottom-plate includes many female clip structures located at the first end, the second end, and the two sides. The apparatus includes a top-plate having corresponding male clip structures configured to lock with the female clip structures to at least have two shaped cavities at the first end for firmly holding fiber ferrules of the fiber-array substantially without lateral and axial motion while leaving excess lengths of fibers outside the second end.
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