Voyant Photonics, Inc.

Columbia University

Seeqc Inc.

Cornell University

Hypres, Inc.

Christopher Thomas Phare

Michal Lipson

Oleg A Mukhanov

Alan M Kadin

Igor V Vernik

Keren Bergman

Steven A Miller

Lawrence Dah Ching Tzuang

Viraj Shah

Moshe Zadka

Aseema Mohanty

You-Chia Chang

Sajan Shrestha

Samantha P Roberts

Lawrence D Tzuang

Daniel E Bush

A cryogenic optoelectronic data link, comprising a sending module operating at a cryogenic temperature less than 100 K. An ultrasensitive electro-optic modulator, sensitive to input voltages of less than 10 mV, may include at least one optically active layer of graphene, which may be part of a microscale resonator, which in turn may be integrated with an optical waveguide or an optical fiber. The optoelectronic data link enables optical output of weak electrical signals from superconducting or other cryogenic electronic devices in either digital or analog form. The modulator may be integrated on the same chip as the cryogenic electrical devices. A plurality of cryogenic electrical devices may generate a plurality of electrical signals, each coupled to its own modulator. The plurality of modulators may be resonant at different frequencies, and coupled to a common optical output line to transmit a combined wavelength-division-multiplexed (WDM) optical signal.

System and method for cryogenic optoelectronic data link

In an optical emitter device, when point emitters are placed on the focal plane of a lens system, each individual point emitter will point to a specific free space angle depending on the position of the point emitter relative to the longitudinal central axis of the lens system. Point emitters comprising end-fire tapers combined with both a turning mirror and a micro-lens provide improved performance, because, unlike grating couplers, end-fire tapers enable uniform broadband operation with all possible polarization states. A turning mirror may be added to direct the light emission from the end-fire tapers to vertically upwards, which enables both a two-dimensional point emitter array and a more streamlined assembly process.

Emitter array

Optical switch trees are commonly used to route light from one input channel to multiple possible output channels one at a time. As the number of output channels increases, the number of wire-bonding pads increases and the drive electronics becomes more complicated. The optical switch tree comprises an array of optical switches arranged in a plurality of rows of optical switches, each connected by a row bus, which are connected to a first multiplexer and a common power source; and a plurality of columns of optical switches, each connected by a column bus, which are connected to a second multiplexer and a common ground. A control processor selects one of the plurality of columns of optical switches to connect to the common ground, and selects one of the plurality of rows of optical switches to connect to the common power source, thereby selecting a single optical switch in the array of optical switches to activate.

Optical multiplexer switch tree

What is disclosed are systems and methods for measurement, pre-distortion, and linearization of FMCW (Frequency Modulated Continuous Wave) LiDAR chirped laser signals, in which I/Q channels of an IF optical signal of a combination of delayed and undelayed versions of the laser signal are generated and used in the process of pre-distorting waveform data for linearization.

Multi-chirp pre-distorted laser linearization for FMCW LiDAR

An optical phased array comprising a row-column driving mechanism is disclosed that reduces the number of digital to analog converter (DAC) channels to the number of rows N and the total number of interface pin counts down to the number of columns plus the number of rows M+N. Disclosed herein are systems and architecture for thermal waveguide-based phase shifters which improve thermal efficiency by having multi-pass waveguides arranged proximate a heating element in a serpentine fashion, which enables an increase in phase shift without increasing the length or the power consumption of the heating element by increasing the total length of waveguide being heated by a singular heating element.

Optical phased array driver

Disclosed herein are systems and architecture for thermal waveguide-based phase shifters which improve thermal efficiency by having multi-pass waveguides arranged under the heating element in a serpentine fashion, with the waveguides having mismatched propagation constants. The combination allows for an increase in phase shift without increasing the length or the power consumption of the resistive heating element by increasing the total length of waveguide being heated by a singular heating element.

High-efficiency thermal phase shifter

A millimeter scale weak grating coupler comprising a silicon waveguide having bars of overlay material of length (a) disposed periodically at a period (&#x2227;) adjacent the silicon waveguide whereby a uniform grating output is achieved.

Millimeter scale long grating coupler

A method of forming an emitting array of waveguides, comprising providing a plurality of waveguides that exhibit different propagation constants so as to ensure that nearby waveguides do not couple evenly over parallel propagation lengths by varying a length in one or more dimensions of respective waveguides, whereby the respective waveguides are phase mismatched with at least their nearest neighbor.

Densely-packed optical phased arrays via k-vector mismatch and metamaterial rods

The optical phased array may use a grating based emitter in order to emit light out of the plane of a PIC chip from an array of output waveguides. A longer grating allows for a larger aperture in the output waveguide dimension and allows for a small spot size. However, even for the relatively thick grating layers available in production foundries, the gratings still cause light to decay within less than 0.5 mm. To reduce the grating strength, some or all of the diffraction gratings may only be provided between the output waveguides, e.g. over trenches between the output waveguides, but not over top the output waveguides, whereby the periodicity only interacts with the weaker evanescent tails of the confined mode instead of the entire cross section of the output waveguides. By forming sufficiently narrow slots in the grating layer only down to the upper cladding layer, the diffraction gratings may be made extremely weak.

Integrated optical waveguide emitter

Methods, systems, and devices are disclosed for implementing electro-optical modulators in which a resonating cavity structure is coupled to a transmission waveguide. In one example, the resonating structure includes a ring resonator whose coupling strength is controlled via an electrical control signal. The ring resonator is made of a capacitor comprising monolayer graphene sheets separated by a thick layer of dielectric material.

Growing community of inventors

New York, NY, United States of America

Christopher Thomas Phare