Wavelength agile multiplexing

Patent metadata

Field	Value
Publication number	US-11815719-B2
Application number	US-202117479987-A
Country	US
Kind code	B2
Filing date	Sep 20, 2021
Priority date	Sep 25, 2020
Publication date	Nov 14, 2023
Grant date	Nov 14, 2023

Abstract

Methods and systems concerning demultiplexing and multiplexing light in optical multiplexing systems are disclosed herein. An optical multiplexing system may include a number of light emitters and a number of associated waveguides. Light emitted from each of the number of light emitters may travel through the associated waveguide and may enter a multiplexer, where a multiplexing operation may occur. At least one of the number of light emitters may be configured to emit light with multiple wavelengths. Such a light emitter may further be associated with a demultiplexer to demultiplex the light with multiple wavelengths before the light reaches a multiplexer. After a demultiplexing operation, the demultiplexed light may be directed to multiple waveguides and the multiple waveguides may guide the demultiplexed light to a multiplexer.

First claim

What is claimed is:

1. A multiplexing system comprising:
a multi-wavelength light emitter configured to emit a multi-wavelength light output;
a demultiplexer configured to receive the multi-wavelength light output and to split the multi-wavelength light output into:
a first split light output having a first wavelength; and
a second split light output having a second wavelength different from the first wavelength;

a light emitter configured to emit a single wavelength light output having a third wavelength different from the first wavelength and the second wavelength; and
a light combiner configured to combine the first split light output, the second split light output, and the single wavelength light output, wherein:
the light emitter is a first light emitter;
the single wavelength light output is a first single wavelength light output;
the multiplexing system further comprises a second single wavelength light emitter configured to emit a second single wavelength light output having a fourth wavelength;
the first wavelength, the second wavelength, the third wavelength, and the fourth wavelength are all different from each other; and
the light combiner is further configured to combine the first split light output, the second split light output, the first single wavelength light output, and the second single wavelength light output into a combined light output.

2. The multiplexing system of claim 1 , wherein the first wavelength, the second wavelength, the third wavelength, and the fourth wavelength are each in a short-wave infrared spectrum.

3. The multiplexing system of claim 1 , further comprising:
a first input waveguide coupled to the demultiplexer and configured to direct the first split light output to a first input channel of the light combiner;
a second input waveguide coupled to the demultiplexer and configured to direct the second split light output to a second input channel of the light combiner; and
a third input waveguide coupled to the light emitter and configured to direct the single wavelength light output to a third input channel of the light combiner.

4. The multiplexing system of claim 3 , wherein the first input channel, the second input channel, and the third input channel are each separated by a distance between 3 nm to 15 nm.

5. The multiplexing system of claim 1 , wherein the first wavelength and the second wavelength are phase shifted by about 180 degrees.

6. The multiplexing system of claim 5 , wherein the light combiner is an Echelle multiplexer that combines the first split light output, the second split light output, and the single wavelength light output to generate a spectrographic output.

7. A method for multiplexing light, the method comprising:
emitting a first light output from a first single wavelength light emitter into a first waveguide, the first light output having a first wavelength;
emitting a second light output from a multi-wavelength light emitter into a demultiplexer, the demultiplexer configured to split the second light output into a first split light output having a second wavelength and a second split light output having a third wavelength;
receiving the first split light output into a second waveguide;
receiving the second split light output into a third waveguide;
emitting a third light output from a second single wavelength light emitter into a fourth waveguide, the third light output having a fourth wavelength;
receiving the first light output, the first split light output, the second split light output, and the third light output into a multiplexer via the first waveguide, the second waveguide, the third waveguide, and the fourth waveguide, respectively;
combining, within the multiplexer, the first light output, the first split light output, the second split light output, and the third light output into a combined light; and
outputting the combined light from the multiplexer and into an output waveguide.

8. The method of claim 7 , wherein:
the first wavelength, the second wavelength, and the third wavelength are separated by about 3 nm to 15 nm.

Assignees

• Apple Inc

Inventors

• Arbore Mark Alan
• Bismuto Alfredo

Classifications

• G02B6/2938 Primary

  for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM · CPC title

• G02B6/2931

  Diffractive element operating in reflection · CPC title

• G02B6/29307

  components assembled in or forming a solid transparent unitary block, e.g. for facilitating component alignment · CPC title

• G02B6/29308 Primary

  Diffractive element having focusing properties, e.g. curved gratings (Rowland circle spectrometers G01J3/20) · CPC title

• H04J14/0205

  Select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping · CPC title