Polarization-insensitive optical link

Patent metadata

Field	Value
Publication number	US-11095390-B2
Application number	US-201816110185-A
Country	US
Kind code	B2
Filing date	Aug 23, 2018
Priority date	Aug 23, 2018
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

Systems, computer-implemented methods, and computer program products to facilitate rotated polarization detection and adjustment are provided. According to an embodiment, a system can comprise a memory that stores computer executable components and a processor that executes the computer executable components stored in the memory. The computer executable components can comprise an optical component that can comprise a polarization monitor component that can detect a rotated polarization state of an optical signal. The computer executable components can further comprise a second optical component that can comprise a polarization controller component that can control a rotation polarization state of the second optical component. The computer executable components can further comprise a feedback loop component that can couple the polarization monitor component to the polarization controller component.

First claim

What is claimed is:

1. A system, comprising:
at least one memory that stores computer executable components; and
at least one processor that executes the computer executable components stored in the at least one memory, wherein the computer executable components comprise:
a polarization monitor component that:
detects an incorrect rotated polarization state of a wavelength of an optical signal received at an optical component from a second optical component, and
transmits a feedback signal to a polarization controller component, wherein the feedback signal comprises a photo current value representing an amount of rotation of the incorrect rotated polarization state of the wavelength of the optical signal;

the polarization controller component that:
accesses a lookup table that comprises settings of a polarization controller of the second optical component for the polarization controller to produce various rotated polarization states of wavelengths of the optical signal, wherein the lookup table was generated during a calibration of the polarization controller, and the settings comprise respective settings of elements selected from a group consisting of a polarization-rotator-splitter and a tunable coupler,
selects at least one setting from the lookup table to generate a correct rotated polarization state of the wavelength of the optical signal based on the feedback signal, and
adjusts the polarization controller to employ the at least one setting to modify the incorrect rotated polarization state of the wavelength of the optical signal transmitted from the second optical component into the correct rotated polarization state.

2. The system of claim 1 , wherein the polarization controller component adjusts the settings of the polarization controller further based on the selected setting, thereby facilitating improved performance associated with the system.

3. The system of claim 1 , further comprising a controller component that manages the feedback signal.

4. The system of claim 1 , wherein the optical component is selected from a group consisting of an optical receiver, a wavelength-division multiplexer optical receiver, an optical switch, and an optical repeater.

5. The system of claim 1 , wherein the second optical component is selected from a group consisting of an optical transmitter, a wavelength-division multiplexer optical transmitter, an optical switch, and an optical repeater.

6. The system of claim 1 , wherein at least one of the optical component or the second optical component comprises one or more polarization-dependent components, thereby facilitating improved power efficiency associated with the processor.

7. The system of claim 1 , further comprising an optical fiber that couples the optical component and the second optical component to one another, wherein the second optical component transmits the optical signal to the optical component via the optical fiber.

8. The system of claim 1 , wherein the polarization monitor component detects respective rotated polarization states of wavelengths of a wavelength-division multiplexed optical signal.

9. The system of claim 8 , wherein the polarization monitor component transmits one or more other feedback signals to the polarization controller component based on the respective rotated polarization states of the wavelengths of the wavelength-division multiplexed optical signal, and wherein the polarization controller component adjusts the settings of the polarization controller to modify the rotated polarization states of the wavelengths of the wavelength-division multiplexed optical signal based on the one or more other feedback signals.

10. The system of claim 1 , wherein the lookup table is a first lookup table, and polarization monitor component employs a second lookup table to determine the photo current value as a function of polarization state, wavelength, and time.

11. A computer-implemented method, comprising:
detecting, by a system operatively coupled to at least one processor, via a polarization monitor component, an incorrect rotated polarization state of a wavelength of an optical signal transmitted by an optical component;
transmitting, by the system, via the polarization monitor component, a feedback signal to a polarization controller component, wherein the feedback signal comprises a photo current value representing an amount of rotation of the incorrect rotated polarization state of the optical signal;
accessing, by the system, via the polarization controller component, a lookup table that identifies settings of a polarization controller of the optical component for the polarization controller to produce various rotated polarization states of wavelengths of the optical signal, wherein the lookup table was generated during a calibration of the polarization controller, and the settings comprise respective settings of elements selected from a group consisting of a polarization-rotator-splitter and a tunable coupler;
selecting, by the system, via the polarization controller component, at least one setting from the lookup table to generate a correct rotated polarization state of the wavelength of the optical signal based on the feedback signal; and
adjusting, by the system, via the polarization controller component, the polarization controller to employ the at least one setting to modify the incorrect rotated polarization state of the wavelength of the optical signal transmitted from the optical component into a correct polarization state.

12. The computer-implemented method of claim 11 , further comprising adjusting, by the system, via the polarization controller component, the settings of the polarization controller based on the selected setting.

13. The computer-implemented method of claim 11 , wherein the lookup table is a first lookup table, and the detecting further comprises employing a second lookup table to determine the photo current value as a function of polarization state, wavelength, and time.

14. The computer-implemented method of claim 11 , wherein the optical signal is received at a second optical component.

15. The computer-implemented method of claim 14 , wherein the second optical component is selected from a group consisting of an optical receiver, a wavelength-division multiplexer optical receiver, an optical switch, and an optical repeater.

16. A computer program product facilitating a rotated polarization detection and adjustment process, the computer program product comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by at least one processor to cause a system to:
detect, by a polarization monitor component, an incorrect rotated polarization state of a wavelength of an optical signal transmitted by an optical component;
transmit, by the polarization monitor component, a feedback signal to a polarization controller component, wherein the feedback signal comprises a photo current value representing an amount of rotation of the incorrect rotated polarization state of the optical signal,
access, by the polarization controller component, a lookup table that identifies settings of a polarization controller of the optical component for the polarization controller to produce various rotated polarization states of wavelengths of the optical signal, wherein the lookup table was generated during a calibration of the polarization controller, and the settings comprise respective settings of elements selected from a group consisting of a polarization-rotator-splitter and a tunable coupler;
select, by the polarization

Assignees

• IBM

Inventors

• Dupuis Nicolas
• Lee Benjamin
• Kuchta Daniel M
• Schares Laurent

Classifications

• H04J14/0305

  in end terminals · CPC title

• H04B10/25

  Arrangements specific to fibre transmission · CPC title

• H04B10/2572 Primary

  due to forms of polarisation-dependent distortion other than PMD · CPC title

• H04J14/06 Primary

  Polarisation multiplex systems · CPC title

• H04J14/02

  Wavelength-division multiplex systems · CPC title