Reduced crosstalk photonic switch

Patent metadata

Field	Value
Publication number	US-11350190-B2
Application number	US-202117161104-A
Country	US
Kind code	B2
Filing date	Jan 28, 2021
Priority date	Mar 14, 2018
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

Described are various configurations of reduced crosstalk optical switches. Various embodiments can reduce or entirely eliminate crosstalk using a coupler that has a power-splitting ratio that compensates for amplitude imbalance caused by phase modulator attenuation. Some embodiments implement a plurality of phase modulators and couplers as part of a dilated switch network to increase overall bandwidth and further reduce potential for crosstalk.

First claim

What is claimed is:

1. A method for routing light using an optical switch, the method comprising:
receiving a plurality of light beams using one or more waveguides of the optical switch, the plurality of light beams including a first light beam at a first optical power and a second light beam at a second optical power that is lower than the first optical power due to attenuation, the optical switch having a physical shape that compensates for attenuation differences of internal light in the optical switch; and
coupling the plurality of light beams using the optical switch such that constructive interference occurs for a first port of the optical switch and destructive interference occurs for a second port of the optical switch due to the physical shape of the optical switch.

2. The method of claim 1 , further comprising:
receiving an input light beam using one or more input ports of the optical switch.

3. The method of claim 2 , further comprising:
generating the plurality of light beams by separating the input light beam into the first light beam and the second light beam.

4. The method of claim 3 , wherein the input light beam is separated into the first light beam and the second light beam by a coupler.

5. The method of claim 1 , wherein the optical switch comprises a coupler that has the physical shape that compensates for attenuation differences of light in the coupler.

6. The method of claim 5 , wherein the coupler has tapered sides that modify a superposition of light in the coupler.

7. The method of claim 6 , wherein the superposition of light in the coupler is modified by the tapered sides such that a power splitting ratio of the coupler compensates for attenuation differences of light in the coupler.

8. The method of claim 7 , wherein the power splitting ratio is t{circumflex over ( )}/(1+t{circumflex over ( )}2), where t is a ratio of field transmission coefficients of an optical component in the optical switch.

9. The method of claim 7 , wherein the power splitting ratio is t/(1+t), where t is a ratio of field transmission coefficients of an optical component in the optical switch.

10. The method of claim 1 , wherein the attenuation is due to one or more optical components in the optical switch.

11. The method of claim 10 , wherein the one or more optical components comprise one or more optical modulators.

12. The method of claim 11 , further comprising:
modulating the second light beam using the one or more optical modulators.

13. The method of claim 11 , wherein the one or more optical modulators include a phase modulator that modulates the second light beam using phase modulation.

14. The method of claim 13 , wherein modulating the second light beam comprises shifting, using the phase modulator, a phase of the second light beam in the optical switch by approximately 90 degrees.

15. The method of claim 13 , wherein modulating the second light beam comprises shifting, using the phase modulator, a phase of the second light beam in the optical switch by approximately 180 degrees.

16. The method of claim 13 , wherein the one or more optical modulators modulate the second light beam based on a quantity of embedded positive and negative carriers in the one or more optical modulators.

17. The method of claim 13 , wherein the one or more optical modulators include a first modulator and a second modulator, and wherein the second modulator modulates the second light beam while the first modulator is inactive.

18. The method of claim 17 , wherein the first modulator that is inactive passes the first light beam unmodulated.

19. The method of claim 1 , further comprising:
outputting light from the first port of the optical switch to an optical network.

20. An optical switch comprising:
one or more waveguides to receive a plurality of light beams that include a first light beam at a first optical power and a second light beam at a second optical power that is lower than the first optical power due to attenuation, the optical switch having a physical shape that compensates for attenuation differences of internal light in the optical switch; and
a first port and a second port, the plurality of light beams coupled such that constructive interference occurs for the first port and destructive interference occurs for the second port due to the physical shape of the optical switch.

Assignees

• Aurrion Inc

Inventors

• Roth Jonathan Edgar

Classifications

• H04Q2011/0015

  using splitting combining · CPC title

• G02B6/3546

  NxM switch, i.e. a regular array of switches elements of matrix type constellation · CPC title

• H04Q2011/0049

  Crosstalk reduction; Noise; Power budget · CPC title

• G02B6/355

  1x2 switch, i.e. one input and a selectable single output of two possible outputs · CPC title

• G02B6/3588

  of the processed beams, i.e. controlling during switching of orientation, alignment, or beam propagation properties such as intensity, size or shape · CPC title