Optical fiber identification and distance measurement
In some examples, optical fiber identification and distance measurement may include utilizing a reflectometer and optical fiber connection device that includes a Rayleigh wavelength pass filter to pass, in one direction, an optical reflectometer signal to an optical fiber. The reflectometer and optical fiber connection device may include a Raman wavelength pass filter to filter out, in another direction, Rayleigh backscattering from the optical reflectometer signal. Further, the Raman wavelength pass filter may pass, in the another direction, a Raman Anti-Stokes signal from the optical fiber.
1. A system comprising:
a connection device comprising:
a Rayleigh wavelength pass filter to pass, in one direction, an optical reflectometer signal to an optical fiber among a plurality of optical fibers; and
a Raman wavelength pass filter to:
pass, in another direction, a Raman Anti-Stokes signal from the optical fiber; and
a fiber optic optical reflectometer connected to the connection device to:
generate the optical reflectometer signal to the optical fiber via the connection device to obtain a reference measurement of the Raman Anti-Stokes signal;
subsequent to obtaining the reference measurement, cause a temperature application source to apply a temperature stimulus at a specified location of the optical fiber, wherein the temperature application source is to be spatially selective in applying the temperature stimulus to the optical fiber to minimize temperature side effects on neighboring optical fibers;
subsequent to the temperature stimulus being applied at the specified location of the optical fiber, generate another optical reflectometer signal to the optical fiber via the connection device to obtain a new measurement of the Raman Anti-Stokes signal;
compare the reference measurement with the new measurement to detect and locate a variation in the optical fiber due to presence of the temperature stimulus at the specified location of the optical fiber; and
identify, based on the located variation in the optical fiber, the optical fiber from the plurality of optical fibers.
2. The system according to claim 1 , wherein the fiber optic optical reflectometer includes an optical time domain reflectometer (OTDR).
3. The system according to claim 1 , wherein the fiber optic optical reflectometer includes an optical frequency domain reflectometer.
4. The system according to claim 1 , wherein the Raman wavelength pass filter is to filter out, in the another direction, Rayleigh backscattering from the optical reflectometer signal.
5. The system according to claim 1 , wherein the temperature application source is a remote controlled temperature application source to generate the temperature stimulus upon actuation of the remote controlled temperature application source.
6. The system according to claim 1 , a wherein the temperature application source is caused to apply the temperature stimulus by heating up the specified location of the optical fiber.
7. The system according to claim 1 , a wherein the temperature application source is caused to apply the temperature stimulus by cooling down the specified location of the optical fiber.
8. The system according to claim 1 , wherein the fiber optic optical reflectometer is connected to a connection of the connection device to transmit the optical reflectometer signal towards the optical fiber, and wherein the optical fiber is connected to another connection of the connection device to transmit signals back to the fiber optic optical reflectometer.
9. A system comprising:
a first filter to pass, in one direction, an optical reflectometer signal to an optical fiber among a plurality of optical fibers;
a second filter to pass, in another direction, a Raman signal from the optical fiber; and
a fiber optic optical reflectometer connected to the first and second filters to:
generate the optical reflectometer signal to the optical fiber via the first and second filters to obtain a reference measurement of the Raman signal;
subsequent to obtaining the reference measurement, cause a temperature application source to apply a temperature stimulus at a specified location of the optical fiber, wherein the temperature application source is to be spatially selective in applying the temperature stimulus to the optical fiber to minimize temperature side effects on neighboring optical fibers;
subsequent to the temperature stimulus being applied at the specified location of the optical fiber, generate another optical reflectometer signal to the optical fiber via the first and second filters to obtain a new measurement of the Raman signal;
compare the reference measurement with the new measurement to detect and locate a variation in the optical fiber due to presence of the temperature stimulus at the specified location of the optical fiber; and
identify, based on the located variation in the optical fiber, the optical fiber from the plurality of optical fibers.
10. The system according to claim 9 , wherein the Raman signal includes a Raman Stokes signal.
11. The system according to claim 9 , wherein the Raman signal includes a Raman Anti-Stokes signal.
12. A method comprising:
establishing a connection from an optical reflectometer to an optical fiber among a plurality of optical fibers via a connection device, wherein the connection device comprises filtering devices for controlling, in one direction, passage of an optical reflectometer signal from the optical reflectometer to the optical fiber and for controlling, in another direction, passage of a Raman signal from the optical fiber to the optical reflectometer;
generating, by a processor of the optical reflectometer, the optical reflectometer signal to the optical fiber via the connection device to obtain a reference measurement of the Raman signal;
subsequent to obtaining the reference measurement, causing, by the processor, a temperature application source to apply a temperature stimulus at a specified location of the optical fiber, wherein the temperature application source is to be spatially selective in applying the temperature stimulus to the optical fiber to minimize temperature side effects on neighboring optical fibers;
subsequent to the temperature stimulus being applied at the specified location of the optical fiber, generating, by the processor, another optical reflectometer signal to the optical fiber via the connection device to obtain a new measurement of the Raman signal;
comparing, by the processor, the reference measurement with the new measurement to detect and locate a variation in the optical fiber due to a presence of the temperature stimulus at the specified location of the optical fiber; and
identifying, based on the located variation in the optical fiber, the optical fiber from the plurality of optical fibers.
13. The method according to claim 12 , further comprising:
identifying, based on the located variation in the optical fiber, a location of the temperature stimulus applied to the optical fiber.
14. The method according to claim 12 , further comprising:
determining, based on the located variation the optical fiber, a distance from one end of the optical fiber to a location of application of the temperature stimulus.
15. The method according to claim 12 , wherein the filtering devices include a Rayleigh wavelength pass filter and a Raman wavelength pass filter, and the method further comprises:
controlling in the one direction, by the Rayleigh wavelength pass filter, the passage of the optical reflectometer signal to the optical fiber;
controlling in the another direction, by the Raman wavelength pass filter, passage of Rayleigh backscattering from the optical reflectometer signal; and
controlling in the another direction, by the Raman wavelength pass filter, the passage of the Raman signal from the optical fiber.
16. The method according to claim 12 , wherein the filtering devices include an optical circulator and a wavelength division multiplexing (WDM) coupling device, and the method further comprises:
controlling in the one direction, by the optical circulator, the passage of the optical reflectometer signal to the optical fiber;
controlling in the another direction, by the optical circulator, passage of Rayleigh backscattering from the optical reflectometer signal; and
controlling in the another direction, by the wavelength division multiplexing (WDM) coupling device, the passage of the Raman signal from the optical fiber.
17. The method according to claim 12 , wherein the filtering devices include a first optical circulator, a second optical circulator, and an optical filter, and the method further comprises:
controlling in the one direction, by the first optical circulator, the passage of the optical reflectometer signal to the optical fiber;
controlling in the another direction, by the second optical circulator, passage of Rayleigh backscattering from the optical reflectometer signal; and
controlling in the another direction, by the optical filter, the passage of the Raman signal from the optical fiber.
18. The method according to claim 12 , further comprising:
applying the temperature stimulus to different optical fibers of the plurality of optical fibers; and
identifying, based on the application of the temperature stimulus to the different optical fibers of the plurality of optical fibers, the optical fiber from the plurality of optical fibers.