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公开(公告)号：US20200225429A1
公开(公告)日：2020-07-16
申请号：US16245076
申请日：2019-01-10
Applicant: INPHI CORPORATION
Inventor： Radhakrishnan L. NAGARAJAN , Masaki KATO
Abstract: A silicon-based edge coupler for coupling a fiber with a waveguide includes a cantilever member being partially suspended with its anchored end coupled to a silicon photonics die in a first part of a silicon substrate and a free end terminated near an edge region separating a second part of the silicon substrate from the first part. The edge coupler further includes a mechanical stopper formed at the edge region with a gap distance ahead of the free end of the cantilever member. Additionally, a V-groove is formed in the second part of the silicon substrate characterized by a top opening and a bottom plane symmetrically connected by two sloped side walls along a fixed Si-crystallography angle. The V-groove is configured to support a fiber with an end facet being pushed against the mechanical stopper and a core center being aligned with the free end of the cantilever member.
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公开(公告)号：US20200018903A1
公开(公告)日：2020-01-16
申请号：US16389078
申请日：2019-04-19
Applicant: INPHI CORPORATION
Inventor： Jie LIN , Masaki KATO
Abstract: The present application discloses a Transverse Electric (TE) polarizer. The TE polarizer includes a semiconductor substrate having an oxide layer. The TE polarizer further includes a waveguide embedded in the oxide layer. Additionally, the TE polarizer includes a plate structure embedded in the oxide 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：US20180299620A1
公开(公告)日：2018-10-18
申请号：US16015854
申请日：2018-06-22
Applicant: INPHI CORPORATION
Inventor： Masaki KATO , Radhakrishnan L. NAGARAJAN
CPC classification number: G02B6/274 , G02B6/1228 , G02B6/125 , G02B6/126 , G02B6/2793 , G02B6/29352 , G02B6/29395
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 passpand 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：US20180217334A1
公开(公告)日：2018-08-02
申请号：US15928732
申请日：2018-03-22
Applicant: INPHI CORPORATION
Inventor： Masaki KATO , Radhakrishnan L. NAGARAJAN
IPC: G02B6/30
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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公开(公告)号：US20180167146A1
公开(公告)日：2018-06-14
申请号：US15890616
申请日：2018-02-07
Applicant: INPHI CORPORATION
Inventor： Masaki KATO , Radhakrishnan L. NAGARAJAN
CPC classification number: H04B10/677 , G02B6/12007 , G02B6/12028 , G02B6/2813 , G02B6/29344 , G02B6/29352 , H04B10/69 , H04J14/02
Abstract: A silicon photonics based temperature-insensitive delay line interferometer (DLI). The DLI includes a first arm comprising a first length of a first material characterized by a first group index corresponding to a first phase delay to transfer a first light wave with a first peak frequency and a second arm comprising a second length of a second material characterized by a second group index corresponding to a second phase to transfer a second light wave with a second peak frequency with a time-delay difference relative to the first light wave. The first phase delay and the second phase delay are configured to change equally upon a change of temperature. The time-delay difference between the first light wave and the second light wave is set to be inversed value of a free spectral range (FSR) to align at least the first peak frequency to a channel of a designated frequency grid.
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Patent Agency Ranking
公开(公告)号：US20180067375A1
公开(公告)日：2018-03-08
申请号：US15812551
申请日：2017-11-14
Applicant: INPHI CORPORATION
Inventor： Masaki KATO
CPC classification number: G02F1/2257 , G02F1/025 , G02F2001/212 , G02F2201/121 , G02F2201/126
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：US20160173221A1
公开(公告)日：2016-06-16
申请号：US14569471
申请日：2014-12-12
Applicant: INPHI CORPORATION
Inventor： Masaki KATO
CPC classification number: G02B6/29398 , G02B6/00 , G02B6/29344 , H04B10/40 , H04J14/02
Abstract: A temperature insensitive DEMUX/MUX device whose wavelength does not change by environment temperature is provided for WDM application. The temperature insensitive DEMUX/MUX device includes a waveguide-based delay-line-interferometer configured to receive an input light bearing multiplexed wavelengths and output a first output light bearing the same multiplexed wavelengths but with a shifted intensity peak position. The first output light is transmitted into a DEMUX device through a first free space coupler and a grating fiber or waveguide to be demultiplexed for forming a plurality of second output lights each bearing an individual wavelength. The DEMUX device includes a second free space coupler for refocusing each second output light to corresponding output channel. The shifted intensity peak position of the first output light is tunable to make each second output light free from any temperature-induced drift off corresponding output channel.
Abstract translation: WDM应用提供了一种温度不敏感的DEMUX / MUX器件，其波长不会因环境温度而变化。 温度不敏感的DEMUX / MUX器件包括基于波导的延迟线干涉仪，其被配置为接收携带复用波长的输入光，并且输出具有相同复用波长但具有偏移的强度峰值位置的第一输出光。 第一输出光通过第一自由空间耦合器和光栅光纤或波导传输到DEMUX器件中，以被解复用以形成各自带有单个波长的多个第二输出光。 DEMUX设备包括第二自由空间耦合器，用于将每个第二输出光重新聚焦到相应的输出通道。 第一输出光的偏移强度峰值位置是可调的，以使得每个第二输出光不受相应输出通道的任何温度感应漂移。
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公开(公告)号：US20210116726A1
公开(公告)日：2021-04-22
申请号：US17094736
申请日：2020-11-10
Applicant: INPHI CORPORATION
Inventor： Xiaoguang TU , Masaki KATO
Abstract: A silicon optical modulator is fabricated to have a multi-slab structure between the contacts and the waveguide, imparting desirable performance attributes. A first slab comprises dopant of a first level. A second slab adjacent to (e.g., on top of) the first slab, comprises a doped region proximate to a contact, and an intrinsic region proximate to the waveguide. The parallel resistance properties and low overlap between the highly doped silicon and optical mode pigtail afforded by the multi-slab configuration, allow the modulator to operate with reduced optical losses and at a high speed. Embodiments may be implemented in a Mach-Zehnder interferometer or in micro-ring resonator modulator configuration.
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公开(公告)号：US20200264373A1
公开(公告)日：2020-08-20
申请号：US16814825
申请日：2020-03-10
Applicant: INPHI CORPORATION
Inventor： Jie LIN , Masaki KATO
Abstract: The present application discloses a Transverse Electric (TE) polarizer. The TE polarizer includes a semiconductor substrate having an oxide layer. The TE polarizer further includes a waveguide embedded in the oxide layer. Additionally, the TE polarizer includes a plate structure embedded in the oxide 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：US20180323577A1
公开(公告)日：2018-11-08
申请号：US16039568
申请日：2018-07-19
Applicant: INPHI CORPORATION
Inventor： Brian TAYLOR , Radhakrishnan L. NAGARAJAN , Masaki KATO
CPC classification number: H01S5/0687 , G02B6/125 , G02B6/2813 , G02B6/2861 , G02B6/4286 , G02B2006/12135 , G02B2006/1215 , H01S5/12 , H04B10/5057 , H04J14/02
Abstract: A wavelength locker integrated with a silicon photonics transmission system comprising a silicon-on-insulator (SOI) substrate and an input via a power tap coupler to receive a fraction of a transmission signal with one or more frequencies from a primary output path of the silicon photonics transmission system. The wavelength locker further includes a splitter configured to split the input to a first signal in a first path and a second signal in a second path and a first delay-line-interferometer (DLI) coupled to the second path to receive the second signal and configured to generate an interference spectrum and output at least two sub-spectrums tunable to keep quadrature points of the sub-spectrums at respective one or more target frequencies. The wavelength locker is configured to generate an error signal fed back to the silicon photonics transmission system for locking the one or more frequencies at the one or more target frequencies.
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