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公开(公告)号：US20210088870A1
公开(公告)日：2021-03-25
申请号：US17025289
申请日：2020-09-18
Applicant: Nokia Solutions and Networks Oy
Inventor： Argishti Melikyan , Po Dong
IPC: G02F1/225
Abstract: An apparatus including an optical modulator and an electronic controller. The optical modulator includes a parallel-nested pair of MZIs, each arm of the MZIs including one or more EAMs therein. The electronic controller is electrically connected to drive the MZIs such that the optical modulator outputs an optical carrier modulated according to a quadrature amplitude modulation constellation with at least five different symbols.
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公开(公告)号：US10715258B1
公开(公告)日：2020-07-14
申请号：US16402558
申请日：2019-05-03
Applicant: Nokia Solutions and Networks Oy
Inventor： Argishti Melikyan , Po Dong
Abstract: An apparatus including first, second, third and fourth photodiodes, optical mixer and first and second optical power splitters. The optical mixer has two or more input ports, three output ports to output first, second and third mixtures of light corresponding to input light received from the input ports and transferred to the output ports. The first splitter has an input port and first and second output ports, to transmit part of one of the mixtures of light from one of the output ports to the first photodiode and a remaining part of the one mixture of light from the other one of the output ports to the third photodiode. The second splitter has an input port and first and second output ports, the second splitter to transmit part of another one of the mixtures of light from one of the output ports to the first photodiode and a remaining part of the other one of the mixtures of light from the other one of the output ports to the fourth photodiode. The third output port of the optical mixer is connected to transmit a different one of the mixtures of light to the second photodiode.
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公开(公告)号：US20190052044A1
公开(公告)日：2019-02-14
申请号：US15671231
申请日：2017-08-08
Applicant: Nokia Solutions and Networks OY
Inventor： Po Dong , Guilhem De Valicourt
Abstract: A directly modulated semiconductor laser whose optical output can be modulated by varying the transmittance of an end reflector of the laser cavity. In an example embodiment, the end reflector can be implemented using a lightwave circuit in which optical waveguides are arranged to form an optical interferometer. At least one of the optical waveguides may include a waveguide section configured to modulate the phase of an optical beam passing therethrough in response to an electrical radio-frequency drive signal in a manner that causes the transmittance and reflectance of the end reflector to be modulated accordingly. Advantageously, relatively high (e.g., >10 GHz) phase and/or amplitude modulation speeds of the optical output can be achieved in this manner to circumvent the inherent modulation-speed limitations of the laser's gain medium.
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Patent Agency Ranking
公开(公告)号：US20180341062A1
公开(公告)日：2018-11-29
申请号：US15604817
申请日：2017-05-25
Applicant: Nokia Solutions and Networks OY
Inventor： Argishti Melikyan , Po Dong
Abstract: An optical device that can be used as an optical hybrid, e.g., in CMOS-compatible PICs. In an example embodiment, the optical device has a single optical input and four optical outputs. The two optical input signals to be mixed in the optical device are applied to the single optical input as transverse electric (TE) and transverse magnetic (TM) polarization components, respectively, of the corresponding polarization-multiplexed optical input signal. In response to the latter, the optical device causes the four outputs to receive four different relative-phase combinations of the two optical input signals, each combination being coupled into a TE waveguide mode at the respective optical output. A PIC having one or more instances of the optical device can be used, e.g., to implement a coherent optical receiver, wherein the TE and TM polarization components of the optical input signal are populated by a communication signal and a local-oscillator signal.
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15.发明申请公开(公告)号：US20180284343A1
公开(公告)日：2018-10-04
申请号：US15476607
申请日：2017-03-31
Applicant: Nokia Solutions and Networks Oy
Inventor： Argishti Melikyan , Young-Kai Chen , Po Dong
CPC classification number: G02B6/124 , G02B6/30 , G02B6/4214 , G02B2006/12107
Abstract: An optical apparatus comprising an optical device having an optical input-output face, at least two planar waveguide arms being located on a substrate, an optical splitter being located on the substrate, and, an optical grating coupler being located on the substrate. The optical splitter has an optical input and a plurality of optical outputs, each optical output being optically connected to a corresponding one of the planar waveguide arms. The optical grating coupler is connected to receive light from each planar waveguide arm and form diffraction pattern therefrom such that a principal maximum of one of the diffraction patterns overlaps with a principal maximum of another of the diffraction patterns on the optical input-output face of the optical device, the principal maxima of the one and another of the diffraction patterns being directed in different directions.
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公开(公告)号：US11899333B2
公开(公告)日：2024-02-13
申请号：US17025289
申请日：2020-09-18
Applicant: Nokia Solutions and Networks Oy
Inventor： Argishti Melikyan , Po Dong
Abstract: An apparatus including an optical modulator and an electronic controller. The optical modulator includes a parallel-nested pair of MZIs, each arm of the MZIs including one or more EAMs therein. The electronic controller is electrically connected to drive the MZIs such that the optical modulator outputs an optical carrier modulated according to a quadrature amplitude modulation constellation with at least five different symbols.
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公开(公告)号：US11139907B2
公开(公告)日：2021-10-05
申请号：US16183261
申请日：2018-11-07
Applicant: Nokia Solutions and Networks OY
Inventor： Argishti Melikyan , Po Dong
Abstract: An optical system having a plurality of ring resonators that can be tuned by regulating their local temperatures in a manner that enables: initial spectral alignment of the optical resonances with the desired carrier wavelengths; fine-tuning of the ring resonators to spectrally align a selected feature of the optical resonances with the carrier wavelengths; and continuous tuning of the ring resonators to counter any detuning thereof during operation. The initial spectral alignment can be performed using intensity/frequency modulation of different carrier wavelengths with different respective frequencies and detection of said frequencies in the photocurrents generated by the individual ring resonators under reverse-bias conditions. After the initial spectral alignment, the ring resonators can be tuned by dithering the local temperatures and then using frequency decomposition of the feedback signal generated by a single photodiode coupled to the optical bus waveguide downstream from the ring resonators to adjust the heater voltages.
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公开(公告)号：US20190187495A1
公开(公告)日：2019-06-20
申请号：US15845073
申请日：2017-12-18
Applicant: Nokia Solutions and Networks OY
Inventor： Argishti Melikyan , Po Dong
CPC classification number: G02F1/0353 , G02F1/0123 , G02F1/01708 , G02F1/0327 , G02F2001/212 , G02F2201/127
Abstract: An electro-optical circuit in which diode-like electrical characteristics of an optical modulator employed therein are used to generate one or more DC-offset levels that place the optical modulator into a proper electrical operating configuration for modulating light transmitted therethrough. In an example embodiment, the optical modulator includes an optical waveguide comprising at least a portion of a semiconductor diode connected to a data driver using a clamping circuit, the clamping circuit being configured to cause a data-modulated electrical signal outputted by the data driver to set a DC-offset level applied to the semiconductor diode. As a result, the use of on-chip and/or on-board bias-tees can advantageously be avoided. In some embodiments, the optical modulator can be driven using two different data signals, each used to set a different respective DC-offset level at the semiconductor diode. In various embodiments, the optical modulator can be an intensity modulator and/or a phase modulator.
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