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公开(公告)号：US12287538B2
公开(公告)日：2025-04-29
申请号：US17820673
申请日：2022-08-18
Applicant: Nokia Solutions and Networks Oy
Inventor： Ruizhi Shi , Ari Novack , Alexander Rylyakov , Eu-Jin Andy Lim
Abstract: An apparatus includes a lithium niobate (LN) layer, and a planar electro-optical modulator having at least one hybrid optical core segment formed of a portion of the LN layer and an optical guiding rib. The optical guiding rib may be located in a top silicon layer of a silicon photonics (SiP) chip, to which a thin-film LN chip is flip-chip mounted, and may be coupled to optical waveguide cores in a first silicon core layer of the SiP chip. One or more drive electrodes are disposed between a substrate of the SiP chip and the LN layer. In some embodiments hybrid optical core segments may include silicon nitride core segments and may form an MZM configured to be differentially or dual-differentially driven.
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公开(公告)号：US11953800B2
公开(公告)日：2024-04-09
申请号：US17667578
申请日：2022-02-09
Applicant: Nokia Solutions and Networks Oy
Inventor： Ajay Mistry , Meisam Bahadori , Alexander Rylyakov , Rafid Sukkar , Matthew Streshinsky
CPC classification number: G02F1/212 , G02F1/2255
Abstract: An optical resonant modulator based on coupling modulation, comprising a resonant structure with an embedded Mach-Zehnder interferometer that is differentially driven to induced amplitude modulation at the output port. The principle of coupling modulation enables high data/baud rates to be achieved in a photonic integrated circuit, e.g. silicon, footprint that is considerably smaller than that of a conventional traveling-wave Mach-Zehnder modulator, in particular by utilizing space saving features, such as ring resonator phase shifters and bend waveguide arms.
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公开(公告)号：US20240195371A1
公开(公告)日：2024-06-13
申请号：US18356608
申请日：2023-07-21
Applicant: Nokia Solutions and Networks Oy
Inventor： Mark Ferriss , Lorenzo Iotti , Alexander Rylyakov
CPC classification number: H03F3/45475 , G05F1/56 , H03F2200/129
Abstract: An apparatus, such as a coherent optical receiver, includes a trans-impedance amplifier (TIA) and a low dropout (LDO) voltage regulator circuit for providing a supply voltage to the TIA. The LDO circuit is configured to adjust the supply voltage responsive to a DC voltage at an output of the TIA. In some implementations the LDO circuit may provide only a fraction of a supply current to the TIA, with another fraction provided by a partial current replica source.
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公开(公告)号：US20240195364A1
公开(公告)日：2024-06-13
申请号：US18356576
申请日：2023-07-21
Applicant: Nokia Solutions and Networks Oy
Inventor： Mark Ferriss , Lorenzo Iotti , Alexander Rylyakov
CPC classification number: H03F1/52 , H03F3/45475 , H03F2200/426
Abstract: An apparatus, such as a coherent optical receiver, includes a transimpedance amplifier (TIA) with differential outputs, and a multi-tanh type current limiter connected across the differential outputs of the transimpedance amplifier. The multi-tanh type current limiter includes two tanh-type current limiters shifted in voltage and connected to subtract an output current thereof from an output current of the TIA.
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公开(公告)号：US20240195374A1
公开(公告)日：2024-06-13
申请号：US18356478
申请日：2023-07-21
Applicant: Nokia Solutions and Networks Oy
Inventor： Lorenzo Iotti , Mark Ferriss , Alexander Rylyakov
CPC classification number: H03G3/30 , H03F3/45197 , H03G2201/103
Abstract: An apparatus, e.g., an optical signal receiver, includes a trans-impedance amplifier (TIA) circuit. The TIA circuit includes a variable gain amplifier (VGA) having a tunable tail current source. The TIA circuit is configured to tune the tail current source to stabilize a DC current to a load resistor of the VGA over an operating gain range of the TIA circuit.
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Patent Agency Ranking
公开(公告)号：US20230251546A1
公开(公告)日：2023-08-10
申请号：US17667578
申请日：2022-02-09
Applicant: Nokia Solutions and Networks Oy
Inventor： Ajay Mistry , Meisam Bahadori , Alexander Rylyakov , Rafid Sukkar , Matthew Streshinsky
CPC classification number: G02F1/212 , G02F1/2255
Abstract: An optical resonant modulator based on coupling modulation, comprising a resonant structure with an embedded Mach-Zehnder interferometer that is differentially driven to induced amplitude modulation at the output port. The principle of coupling modulation enables high data/baud rates to be achieved in a photonic integrated circuit, e.g. silicon, footprint that is considerably smaller than that of a conventional traveling-wave Mach-Zehnder modulator, in particular by utilizing space saving features, such as ring resonator phase shifters and bend waveguide arms.
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公开(公告)号：US11599005B2
公开(公告)日：2023-03-07
申请号：US17396954
申请日：2021-08-09
Applicant: Nokia Solutions and Networks Oy
Inventor： Christopher Williams , Mostafa Ahmed , Alexander Rylyakov , Richard C. Younce , Yang Liu , Ran Ding , Abdelrahman Ahmed
Abstract: A multi-section optical modulator and related method are disclosed wherein two waveguide arms traverse a plurality of successive modulating sections. A differential drive signal is applied separately to each waveguide arm of each modulating sections in synchronism with the transmission of light along the waveguide arms, effecting a dual differential driving of each section. By suitably selecting the number of modulating sections and the section length, a high modulation bandwidth and a high modulation efficiency may be achieved simultaneously for a given peak-to-peak voltage swing of the drive signal.
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公开(公告)号：US20240195375A1
公开(公告)日：2024-06-13
申请号：US18356519
申请日：2023-07-21
Applicant: Nokia Solutions and Networks Oy
Inventor： Lorenzo Lotti , Mark Ferriss , Alexander Rylyakov
CPC classification number: H03G3/3084 , H03F1/301 , H03F1/3211 , H03F3/45475 , H03G1/0088
Abstract: A transimpedance amplifier (TIA) includes a voltage amplifier and a first set of variable-resistors connected in parallel as a variable shunt feedback to the voltage amplifier. A control circuit is connected to control the variable resistors of the first set in a manner responsive to a TIA gain control voltage VGC. The control circuit includes a ramp generator and a reference set of variable-resistors connected in parallel. The ramp generator is configured to generate, responsive to an output voltage of the control circuit, a plurality of ramp voltages such that each of the voltages adjusts a corresponding one of the variable-resistors of the first set and of the reference set.
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公开(公告)号：US20240195373A1
公开(公告)日：2024-06-13
申请号：US18356462
申请日：2023-07-21
Applicant: Nokia Solutions and Networks Oy
Inventor： Lorenzo Iotti , Mark Ferriss , Alexander Rylyakov
CPC classification number: H03G3/30 , H03F3/45475 , H03G2201/103
Abstract: An apparatus, such as a coherent optical receiver, includes a TIA, the TIA including a cascode circuit having a cascode node. A first tunable element is connected to tunably shunt the cascode node to vary a voltage gain of the TIA, e.g., up to a first amount. Implementations of the TIA further include another tunable element connected to vary a load of the cascode circuit to vary the voltage gain, e.g., up to a second amount. A current steering circuit may be provided to vary the voltage gain up to a third amount, each of the amounts being only a fraction of a target voltage gain variation of the TIA.
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公开(公告)号：US20210373409A1
公开(公告)日：2021-12-02
申请号：US17396954
申请日：2021-08-09
Applicant: Nokia Solutions and Networks Oy
Inventor： Christopher Williams , Mostafa Ahmed , Alexander Rylyakov , Richard C. Younce , Yang Liu , Ran Ding , Abdelrahman Ahmed
IPC: G02F1/225
Abstract: A multi-section optical modulator and related method are disclosed wherein two waveguide arms traverse a plurality of successive modulating sections. A differential drive signal is applied separately to each waveguide arm of each modulating sections in synchronism with the transmission of light along the waveguide arms, affecting a dual differential driving of each section. By suitably selecting the number of modulating sections and the section length, a high modulation bandwidth and a high modulation efficiency may be achieved simultaneously for a given peak-to-peak voltage swing of the drive signal.
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