Raytheon Company

Lightmatter, Inc.

The Charles Stark Draper Laboratory, Inc.

Anthony Kopa

Nicholas Christopher Harris

Darius Bunandar

Michael G Moebius

Michael Gould

Gregg E Favalora

Jonathan P Comeau

Matthew A Morton

Carlos Dorta-Quinones

Carl Ramey

Jeffrey A Korn

Steven J Byrnes

Valery S Kaper

Mykhailo Tymchenko

Joseph J Register

Shashank Gupta

Ian Ward Frank

Ajay Joshi

Dennis M Callahan, Jr

Valerie J Bloomfield

Bradford Turcott

Binoy Shah

Robert Turner

Hongmei Zhang

Peter H Lewis

Reza Baghdadi

Steven Klinger

Nikhil Kumar

Srinivasan Ashwyn Srinivasan

Elliot Greenwald

Jessie Rosenberg

Sandeep Sane

Kuang Liu

Photonic interposers that enable low-power, high-bandwidth inter-chip (e.g., board-level and/or rack-level) as well as intra-chip communication are described. Described herein are techniques, architectures and processes that improve upon the performance of conventional computers. Some embodiments provide photonic interposers that use photonic tiles, where each tile includes programmable photonic circuits that can be programmed based on the needs of a particular computer architecture. Some tiles are instantiations of a common template tile that are stitched together in a 1D or a 2D arrangement. Some embodiments described herein provide a programmable physical network designed to connect pairs of tiles together with photonic links.

Photonic communication platform and related architectures, systems and methods

Described herein are wavelength division multiplexing (WDM) transceivers configured to support fast, bidirectional communication over optical channels. An optical transceiver comprises a transmitter, a receiver, an input/output (I/O) port and an optical interleaver. The transmitter comprises a first bus waveguide and a plurality of optical modulators coupled to the first bus waveguide, each of the optical modulators being resonant at a respective wavelengths in a first wavelength set. The receiver comprises a second bus waveguide and a plurality of optical filters coupled to the second bus waveguide, each of the optical filters being resonant at a respective wavelength in a second wavelength set. The (I/O) port is coupled to an optical channel. The optical interleaver is configured to selectively couple light having wavelengths in the first wavelength set from the first waveguide bus to the I/O port, and selectively couple light having wavelengths in the second wavelength set from the I/O port to the second bus waveguide.

Spectrally interleaved optical transceivers

Photonic processors are described. The photonic processors described herein are configured to perform matrix multiplications (e.g., matrix vector multiplications). Matrix multiplications are broken down in scalar multiplications and scalar additions. Some embodiments relate to devices for performing scalar additions in the optical domain. One optical adder, for example, includes an interferometer having a plurality of phase shifters and a coherent detector. Leveraging the high-speed characteristics of these optical adders, some processors are sufficiently fast to support clocks in the tens of gigahertz of frequency, which represent a significant improvement over conventional electronic processors.

Photonics processor architecture

A light steeling system and method for diffractive steering of electromagnetic radiation such as visible light is disclosed. Embodiments of the light steering system include leaky-mode SAW modulators as light modulator devices. The SAW modulators preferably include reflective diffractive gratings. The gratings are mounted to/patterned upon an exit face that opposes an exit surface of the SAW modulator, in one example. Steering of light signals emitted from the SAW modulators in these systems can be accomplished by varying wavelength of light signals introduced to the SAW modulators, and/or by varying frequency of RF drive signals applied to the SAW modulators. In addition, light field generators that incorporate SAW modulators of the proposed light steering system within displays of the light field generators are also disclosed.

System and method for diffractive steering of electromagnetic radiation

Packaging and interconnect systems for edge-emitting light modulators are disclosed. Embodiments address the challenge of integrating many edge-emitting modulators such as surface acoustic wave (SAW) modulators together in a single light field generator system. In one example, a proposed light field generator system includes a stack of projector modules and a mounting block having slots. The projector modules preferably have a printed circuit board (PCB) form factor that enables the slots of the mounting block to receive and hold the modules. Each module includes a module board and one or more SAW substrates carried by the module board, and an array of SAW modulators are formed/fabricated within each substrate. Proposed substrate fabrication techniques provide wiring and routing of RF and optical signals to the SAW modulators within each substrate to achieve a density of light modulators suitable for practical application to light field projection systems.

Packaging and interconnect systems for edge-emitting light modulators based on surface acoustic wave (SAW) modulation

A frequency conversion circuit having a plurality of N signal channels, each being fed an input signal and a train of pluses having a period T and a duty cycle T/N. Each channel includes: a sampler coupled the input signal and being responsive to sampling signals; and a controllable time delay for producing the train of sampling signals in response to the train of pulses, the time delay imparting a time delay to the pulses in accordance with a time delay command signal fed to the time delay. Each one of the sampling signals is produced by the time delay in each one of the channels with the period T and the duty cycle T/N with the sampling signals in one of the trains of the sampling signals being delayed with respect to the sampling signals in another one of the trains the sampling signals a time T/N.

Beam forming system having linear samplers

An interface for connecting a differential signal circuit having a differential signal output and a reference potential terminal to an input of a single ended signal circuit and a reference potential terminal. The interface includes a differential transmission line having a pair of electromagnetically coupled microwave transmission lines having first ends connected to the differential signal output and second ends, one of the second ends being connected to the single ended circuit input and the other one of the second ends being coupled to the reference potential terminals of the differential signal circuit and the single ended signal circuit.

Differential-to-single-ended transmission line interface

A frequency conversion circuit having a plurality of N signal channels, each being fed an input signal and a train of pluses having a period T and a duty cycle T/N. Each signal channel includes: a column III-V semiconductor sampler coupled the input signal and being responsive to sampling signals; and a column IV semiconductor controllable time delay for producing the train of sampling signals in response to a train of pulses produced on the column IV semiconductor, the time delay imparting a time delay to the pulses in accordance with a time delay command signal fed to the time delay. Each one of the sampling signals is produced by the time delay in each one of the channels with the period T and the duty cycle T/N with the sampling signals in one of the trains of the sampling signals being delayed with respect to the sampling signals in another one of the trains the sampling signals a time T/N.

Linear sampler

A DAC for converting a sequence of digital words into a corresponding analog signal. The DAC includes: a thermometer code generator fed by the sequence of digital words for providing N parallel outputs, each one of the outputs having one of two discrete levels; and an amplifier section having a plurality of N amplifiers, each one of the N amplifiers being fed by a different one of the M outputs. Each one of the amplifiers is driven into saturation in response to one of the two discrete levels or pinched-off in response to the other one of the two discrete levels. A combiner sums outputs of the N amplifiers producing a sequence of analog signals having levels related to the decimal values of the sequence of the digital words. An interconnection network interleaves connections between the thermometer code generator and the plurality of amplifier sections.

Digital to analog converter (DAC)

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Somerville, MA, United States of America

Anthony Kopa