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

IPC: G02B6/124 ,  G02B6/42 ,  G02B6/30

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.

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

IPC: G02F1/225 ,  G02F1/21

CPC classification number: G02F1/225 ,  G02F1/212

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.

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

IPC: H04J14/02 ,  G02F1/01 ,  H04B1/04 ,  H04B1/10

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.

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

IPC: G02F1/035 ,  G02F1/03 ,  G02F1/017 ,  G02F1/01

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.