Faraday-based polarization scrambler

Patent metadata

Field	Value
Publication number	US-10866438-B2
Application number	US-201916351131-A
Country	US
Kind code	B2
Filing date	Mar 12, 2019
Priority date	Mar 12, 2019
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A Faraday-based polarization scrambler is disclosed. The Faraday-based polarization scrambler may comprise a first toroidal assembly. The first toroidal assembly may include an optical fiber that is looped to form a first looped portion, and a first electrical wire that coils around the first looped portion to form a first toroidal configuration. In some examples, the first electrical wire may be connected to a voltage source and carries a current to form a magnetic field within the first toroidal configuration. In some examples, there may be additional toroidal assemblies provided to the Faraday-based polarization scrambler. One or more of these toroidal assemblies may create an actuation field to effect modulation for polarization scrambling and emulation that mitigates polarization-dependent effects.

First claim

The invention claimed is:

1. A Faraday-based polarization scrambler, comprising:
a first toroidal assembly comprising:
an optical fiber that is looped to form a first looped portion; and
a first electrical wire that coils around the first looped portion to form a first toroidal configuration, wherein the first electrical wire is connected to a voltage source and carries a current to form a magnetic field within the first toroidal configuration; and

a second toroidal assembly connected to the first toroidal assembly via the optical fiber; and
wherein the first toroidal assembly creates an actuation field to effect modulation for polarization scrambling and emulation that mitigates polarization-dependent effects, and the second toroidal assembly is offset from the first toroidal assembly, wherein the offset is between 0 to 90 degrees from a plane of the optical fiber.

2. The system of claim 1 , wherein the optical fiber transmits light from a polarized light source.

3. The system of claim 1 , wherein the looped portion comprises a plurality of optical fiber loops.

4. The system of claim 1 , wherein the electrical wire coils the looped portion N times, wherein N represents an integer.

5. The system of claim 1 , wherein the second toroidal assembly comprises:
a second looped portion comprising the optical fiber; and
a second electrical wire that coils around the second looped portion to form a second toroidal configuration, wherein the second electrical wire is connected to a voltage source and carries a current to form a magnetic field within the second toroidal configuration.

6. The system of claim 5 , wherein the offset is 45 degrees from a plane of the optical fiber.

7. The system of claim 5 , further comprising:
additional toroidal assemblies connected to the first toroidal assembly and the second toroidal assembly via the optical fiber, each of the additional toroidal assembly comprising:
a looped portion comprising the optical fiber; and
an electrical wire that coils around the looped portion to form an additional toroidal configuration, wherein the electrical wire is connected to a voltage source and carries a current to form a magnetic field within the additional toroidal configuration; and
wherein the additional toroidal assemblies are offset from each other, as well as from the first toroidal assembly and the second toroidal assembly.

8. The system of claim 7 , wherein the Faraday-based polarization scrambler mitigates polarization-dependent effects by leveraging Faraday effects to synthesize or emulate desired state of polarization (SOP) trajectories.

9. The system of claim 8 , wherein the offsets of the first toroidal assembly, the second toroidal assembly, and additional toroidal assemblies obviate any incidental assembly alignment to an eigen-axis that results in having no effect on the SOP.

10. A method of making Faraday-based polarization scrambler, comprising:
providing a first toroidal assembly comprising:
an optical fiber that is looped to form a first looped portion; and
a first electrical wire that coils around the first looped portion to form a first toroidal configuration, wherein the first electrical wire is connected to a voltage source and carries a current to form a magnetic field within the first toroidal configuration; and

providing one or more additional toroidal assemblies connected to the first toroidal assembly via the optical fiber,
wherein the first toroidal assembly creates an actuation field to effect modulation for polarization scrambling and emulation that mitigates polarization-dependent effects, and wherein each of the additional toroidal assemblies are offset from each other, as well as from the first toroidal assembly, wherein the offset is determined by the following:
Offset=90×(½) N ,

where N is an integer that represents each additional toroidal assembly, and where offset is measured in degrees from a plane of the optical fiber.

11. The method of claim 10 , wherein each of the additional toroidal assemblies comprises:
a looped portion comprising the optical fiber; and
an electrical wire that coils around the looped portion to form an additional toroidal configuration, wherein the electrical wire is connected to a voltage source and carries a current to form a magnetic field within the additional toroidal configuration.

12. The method of claim 11 , wherein the Faraday-based polarization scrambler mitigates polarization-dependent effects by leveraging Faraday effects to synthesize or emulate desired state of polarization (SOP) trajectories.

13. The method of claim 11 , wherein the offsets of the first toroidal assembly and additional toroidal assemblies obviate any incidental assembly alignment to an eigen-axis that results in having no effect on the SOP.

14. A non-transitory computer-readable storage medium having an executable stored thereon, which when executed instructs a processor to perform the method of claim 11 .

15. A method of using Faraday-based polarization scrambler, comprising:
providing a first toroidal assembly comprising:
an optical fiber that is looped to form a first looped portion; and
a first electrical wire that coils around the first looped portion to form a first toroidal configuration, wherein the first electrical wire is connected to a voltage source and carries a current to form a magnetic field within the toroidal configuration; and

providing one or more additional toroidal assemblies connected to the first toroidal assembly via the optical fiber, each of the additional toroidal assemblies comprising:
a looped portion comprising the optical fiber; and
an electrical wire that coils around the looped portion to form an additional toroidal configuration, wherein the electrical wire is connected to a voltage source and carries a current to form a magnetic field within the additional toroidal configuration; and

wherein each of the additional toroidal assemblies are offset from each other, as well as from the first toroidal assembly, wherein the offset is determined by the following:
Offset=90×(½) N ,

where N is an integer that represents each additional toroidal assembly, and where offset is measured in degrees from a plane of the optical fiber; and
wherein the first toroidal assembly and the additional toroidal assemblies together create an actuation field to effect modulation for polarization scrambling and emulation that mitigates polarization-dependent effects.

16. The method of claim 15 , wherein the Faraday-based polarization scrambler mitigates polarization-dependent effects by leveraging Faraday effects to synthesize or emulate desired state of polarization (SOP) trajectories.

17. The method of claim 15 , wherein the offsets of the first toroidal assembly and additional toroidal assemblies obviate any incidental assembly alignment to an eigen-axis that results in having no effect on the SOP.

18. A non-transitory computer-readable storage medium having an executable stored thereon, which when executed instructs a processor to perform the method of claim 15 .

Assignees

• Viavi Solutions Inc

Inventors

• Philipson Joshua
• Wagner Christopher Russell

Classifications

• G02F1/0139

  Polarisation scrambling devices; Depolarisers · CPC title

• G02F1/09 Primary

  based on magneto-optical elements, e.g. exhibiting Faraday effect · CPC title

• G01R15/246

  based on the Faraday, i.e. linear magneto-optic, effect · CPC title

• G02F1/0136 Primary

  for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation (G02F1/0353 takes precedence) · CPC title

• G01R15/247

  Details of the circuitry or construction of devices covered by G01R15/241 - G01R15/246 · CPC title