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公开(公告)号：US10734090B2
公开(公告)日：2020-08-04
申请号：US16458084
申请日：2019-06-30
申请人： Luxtera, Inc.
发明人： Oleksiy Zabroda
摘要： Systems and methods for a track and hold amplifier with extended dynamic range may include a track amplifier comprising a first PMOS transistor coupled to a first NMOS transistor, a second PMOS transistor coupled to a second NMOS transistor, a capacitor at gates of each NMOS and PMOS transistor, and a plurality of switches. The track and hold amplifier is operable to, during a tracking mode of the track and hold amplifier, couple a differential input signal to each NMOS and PMOS transistor via a first switch coupled to a first capacitor coupled to the gate of the first PMOS transistor and a second capacitor coupled to the gate of the first NMOS transistor, and via a second switch coupled to a third capacitor coupled to the gate of the second PMOS and a fourth capacitor coupled to the gate of the second NMOS transistor.
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公开(公告)号：US20200052791A1
公开(公告)日：2020-02-13
申请号：US16593111
申请日：2019-10-04
申请人： Luxtera, Inc.
IPC分类号： H04B10/40 , H04B10/077
摘要： Methods and systems for an optical connection service interface may include, in an optical data link comprising an optical fiber coupling first and second transceivers, generating a signal for the transceivers at a low frequency, and communicating, utilizing the optical fiber, an optical data signal at a high frequency and an Optical Connection Service interface (OCSi) signal at an intermediate frequency. An optical signal may be modulated at the intermediate frequencies for the OCSi, and may be modulated and communicated to the second transceiver. The communicated modulated signal and the optical data signal may be detected utilizing a photodetector in the second transceiver. The detected optical signal may be demodulated, and an optical power of the optical data signal may be configured based on the demodulated signal.
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公开(公告)号：US10560197B2
公开(公告)日：2020-02-11
申请号：US16268774
申请日：2019-02-06
申请人： Luxtera, Inc.
发明人： Gianlorenzo Masini , Subal Sahni
IPC分类号： H04B10/60 , G01J1/44 , H01L31/0224 , H01L31/028 , H01L31/0368 , H01L31/11 , H03F3/08
摘要： A method and system for optoelectronic receivers utilizing waveguide heterojunction phototransistors (HPTs) integrated in a wafer are disclosed and may include receiving optical signals via optical fibers operably coupled to a top surface of the chip. Electrical signals may be generated utilizing HPTs that detect the optical signals. The electrical signals may be amplified via voltage amplifiers, or transimpedance amplifiers, the outputs of which may be utilized to bias the HPTs by a feedback network. The optical signals may be coupled into opposite ends of the HPTs. A collector of the HPTs may comprise a silicon layer and a germanium layer, a base may comprise a silicon germanium alloy with germanium composition ranging from 70% to 100%, and an emitter including crystalline or poly Si or SiGe. The optical signals may be demodulated by communicating a mixer signal to a base terminal of the HPTs.
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公开(公告)号：US20190334649A1
公开(公告)日：2019-10-31
申请号：US16505349
申请日：2019-07-08
申请人： Luxtera, Inc.
发明人： Brian Welch
摘要： A method and system is provided for cassette based wavelength division multiplexing and may include an optical system with an aggregating cassette. The optical system may include optical transceivers, with each generating optical signals at a different wavelength. The aggregating cassette may include one or more multiplexers coupled to each of the optical transceivers via optical fibers. The optical transceivers may generate modulated optical signals at one of the different wavelengths. The optical fibers may communicate one of the modulated optical signals from each of the optical transceivers to the one or more multiplexers. The modulated optical signals may be multiplexed to one or more output optical fibers. The multiplexed signals may be communicated to one or more receiving demultiplexers using the one or more output optical fibers. The one or more demultiplexers may demultiplex the multiplexed signals into separate wavelength signals.
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公开(公告)号：US10439734B2
公开(公告)日：2019-10-08
申请号：US15636540
申请日：2017-06-28
申请人： Luxtera, Inc.
发明人： Simon Pang , Joseph Balardeta
摘要： Methods and systems for waveguide delay based equalization summing at single-ended to differential converters in optical communication are disclosed and may include: in an optoelectronic receiver including a directional coupler, photodetectors, transimpedance amplifiers (TIAs), and a gain stage, receiving an input optical signal; splitting the input optical signal into first and second optical signals using the directional coupler; generating a first current from the first optical signal using a first photodetector; generating a first voltage from the first current using a first TIA; communicating the first voltage to a first input of the gain stage; generating a second current from the second optical signal using a second photodetector; generating a second voltage from the first signal using a second TIA; communicating the second voltage to a second input of the gain stage; and generating a differential output voltage from the first and second voltages using the gain stage.
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6.发明申请公开(公告)号：US20190296826A1
公开(公告)日：2019-09-26
申请号：US16424142
申请日：2019-05-28
申请人： Luxtera, Inc.
摘要： Methods and systems for a bi-directional receiver for standard single-mode fiber based on grating couplers may include, in an integrated circuit, a multi-wavelength grating coupler, and first and second optical sources coupled to the integrated circuit: coupling first and second source optical signals at first and second wavelengths into the photonically-enabled integrated circuit using the first and second optical sources, where the second wavelength is different from the first wavelength, receiving a first optical data signal at the first wavelength from an optical fiber coupled to the multi-wavelength grating coupler, and receiving a second optical data signal at the second wavelength from the optical fiber. Third and fourth optical data signals at the first and second wavelengths may be communicated out of the optoelectronic transceiver via the multi-wavelength grating coupler.
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公开(公告)号：US10365447B2
公开(公告)日：2019-07-30
申请号：US15907543
申请日：2018-02-28
申请人： Luxtera, Inc.
摘要： Methods and systems for a chip-on-wafer-on-substrate assembly are disclosed and may include in an optical communication system comprising an electronics die and a substrate. The electronics die is bonded to a first surface of a photonic interposer and the substrate is coupled to a second surface of the photonic interposer opposite to the first surface. An optical fiber and a light source assembly are coupled to the second surface of the interposer in one or more cavities formed in the substrate. A continuous wave (CW) optical signal may be received in the photonic interposer from the light source assembly, and a modulated optical signal may be communicated between the optical fiber and photonic interposer. The received CW optical signal may be coupled to an optical waveguide in the photonic interposer using a grating coupler.
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8.发明申请公开(公告)号：US20190229689A1
公开(公告)日：2019-07-25
申请号：US16372164
申请日：2019-04-01
申请人： Luxtera, Inc.
发明人： Brian Welch
CPC分类号： H03F3/45237 , G01J1/44 , H03F1/34 , H03F3/087 , H03F3/45071 , H03F3/45076 , H03F3/45475 , H03F3/45968 , H03F2200/405 , H03F2203/45222 , H03F2203/45288 , H03F2203/45511 , H03F2203/45526
摘要： A system for a differential trans-impedance amplifier circuit comprising: an amplifier having a pair of input nodes and configured to generate an amplified replica of a differential voltage on said pair of input nodes; a photodiode; a pair of capacitors coupling said photodiode to said pair of input nodes; at least one resistance coupled between said pair of input nodes of said amplifier; and a bias network comprising two photodiode biasing resistances each photodiode biasing resistance coupled in series between said photodiode and a respective DC voltage. A feedback loop for the amplifier may include source followers that are operable to level shift voltages prior to coupling capacitors that couple said photodiode to said amplifier to ensure stable bias conditions for said amplifier. The source followers may include CMOS transistors. The amplifier may be integrated in a complementary metal-oxide semiconductor (CMOS) chip, which may include a CMOS photonics chip.
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公开(公告)号：US10348459B2
公开(公告)日：2019-07-09
申请号：US15962829
申请日：2018-04-25
申请人： Luxtera, Inc.
发明人： Steffen Gloeckner , Subal Sahni , Joseph Balardeta , Simon Pang , Stefan Barabas , Scott Denton
IPC分类号： H04B10/00 , H04L1/24 , H04B10/40 , H04B10/077 , H04B10/80
摘要： Methods and systems for an optoelectronic built-in self-test (BIST) system for silicon photonics optical transceivers are disclosed and may include, in an optoelectronic transceiver having a transmit (Tx) path and a receive (Rx) path, where the Rx path includes a main Rx path and a BIST loopback path: generating a pseudo-random bit sequence (PRBS) signal, generating an optical signal in the Tx path by applying the PRBS signal to a modulator, communicating the optical signal to the BIST loopback path and converting to an electrical signal utilizing a photodetector, the photodetector being a replica of a photodetector in the main Rx path, and assessing the performance of the Tx and Rx paths by extracting a PRBS signal from the electrical signal. The transceiver may be a single complementary-metal oxide semiconductor (CMOS) die or in two CMOS die, where a first comprises electronic devices and a second comprises optical devices.
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公开(公告)号：US10348437B2
公开(公告)日：2019-07-09
申请号：US15585838
申请日：2017-05-03
申请人： Luxtera, Inc.
发明人： Brian Welch
IPC分类号： H04J14/02 , H04B10/25 , H04B10/40 , H04B10/50 , H04B10/516 , G02B6/42 , G02B6/12 , G02B6/30 , G02B6/34
摘要： A method and system is provided for cassette based wavelength division multiplexing and may include an optical system with an aggregating cassette. The optical system may include optical transceivers, with each generating optical signals at a different wavelength. The aggregating cassette may include one or more multiplexers coupled to each of the optical transceivers via optical fibers. The optical transceivers may generate modulated optical signals at one of the different wavelengths. The optical fibers may communicate one of the modulated optical signals from each of the optical transceivers to the one or more multiplexers. The modulated optical signals may be multiplexed to one or more output optical fibers. The multiplexed signals may be communicated to one or more receiving demultiplexers using the one or more output optical fibers. The one or more demultiplexers may demultiplex said multiplexed signals into separate wavelength signals.
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