Residue arithmetic nanophotonic system

Patent metadata

Field	Value
Publication number	US-11922136-B2
Application number	US-201916284762-A
Country	US
Kind code	B2
Filing date	Feb 25, 2019
Priority date	Feb 23, 2018
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

An integrated photonics computing system implements a residue number system (RNS) to achieve orders of magnitude improvements in computational speed per watt over the current state-of-the-art. RNS and nanophotonics have a natural affinity where most operations can be achieved as spatial routing using electrically controlled directional coupler switches, thereby giving rise to an innovative processing-in-network (PIN) paradigm. The system provides a path for attojoule-per-bit efficient and fast electro-optic switching devices, and uses them to develop optical compute engines based on residue arithmetic leading to multi-purpose nanophotonic computing.

First claim

The invention claimed is:

1. A residue photonic system, comprising:
an array of a plurality of 2×2 photonic switches, said array having M modulus inputs and M modulus outputs and receiving a light signal at one input of the M modulus inputs, said plurality of photonic switches each having a bar state and a cross state and arranged to indicate a residual value of the received light signal as an output at one output of the M modulus outputs, whereby the one of the M modulus inputs reflects a first value and the bar state and cross state reflect a second value, and the one output reflects an arithmetic operation of the first value and the second value, wherein the light signal comprises a plurality of light signals, wherein each of the plurality of light signals is at a different set of wavelengths and the light signals are processed in parallel using wavelength division multiplexing; and
a set of one or more filters at each of the plurality of outputs, said set of filters determining a wavelength of the light signal at that output.

2. The residue photonic system of claim 1 , wherein the arithmetic operation comprises an addition of the first value and the second value.

3. The residue photonic system of claim 1 , wherein the one output reflects a residue value of an M modulus.

4. The residue photonic system of claim 1 , wherein the arithmetic operation comprises multiplication.

5. The residue photonic system of claim 1 , wherein the light signal has a single wavelength.

6. The residue photonic system of claim 1 , wherein the plurality of photonic switches are comprised of a material whose refractive index is actively modulated.

7. A residue photonic system, comprising:
an array of a plurality of photonic devices, said array having M modulus inputs and M modulus outputs and receiving a light signal at one input of the M modulus inputs, said plurality of photonic devices arranged to indicate a residual value of the received light signal as an output at one output of the M modulus outputs, whereby the one of the M modulus inputs reflects a first value and a state of one of the plurality of the photonic devices reflects a second value, and the one output reflects an arithmetic operation of the first value and the second value, wherein the light signal comprises a plurality of light signals, wherein each of the plurality of light signals is at a different set of wavelengths and the light signals are processed in parallel using wavelength division multiplexing; and
a set of one or more filters at each of the plurality of outputs, said set of filters determining a wavelength of the light signal at that output.

8. The residue photonic system of claim 7 , wherein the arithmetic operation comprises an addition of the first value and the second value.

9. The residue photonic system of claim 7 , wherein the one output reflects a residue value of an M modulus.

10. The residue photonic system of claim 7 , wherein the arithmetic operation comprises multiplication.

11. The residue photonic system of claim 7 , wherein the light signal has a single wavelength.

12. The residue photonic system of claim 7 , wherein said photonic devices comprise spatial light modulators (SLM) and/or digital mirror displays (DMD).

13. The residue photonic system of claim 7 , wherein the plurality of photonic switches are comprised of a material whose refractive index is actively modulated.

Assignees

• Univ George Washington

Inventors

• Peng Jiaxin
• El-Ghazawi Tarek
• Sorger Volker J
• Sun Shuai

Classifications

• G06F7/729 Primary

  using representation by a residue number system · CPC title

• G02B6/122

  Basic optical elements, e.g. light-guiding paths · CPC title

• G02B6/3596

  With planar waveguide arrangement, i.e. in a substrate, regardless if actuating mechanism is outside the substrate · CPC title

• G02F1/311

  Cascade arrangement of plural switches · CPC title

• G02F1/3132 Primary

  of directional coupler type · CPC title