ESTIMATION APPARATUS, ESTIMATION METHOD AND PROGRAM
An aspect of the present invention is an estimation device including: a control unit that estimates a vibration position that is a position on an optical fiber where vibration is induced by vibration of an external environment based on a reception signal that is a result of propagation of a transmission signal that is an optical signal transmitted by a transmitter through the optical fiber, in which the control unit executes estimation processing including: compensation processing including wavelength dispersion compensation processing of compensating for wavelength dispersion with respect to the reception signal, transmission signal estimation processing of estimating the transmission signal based on a result of the wavelength dispersion compensation processing, wavelength dispersion reapplication processing of reapplying the wavelength dispersion to a result of the compensation processing, and vibration position estimation processing of estimating the vibration position based on a result of inverse mapping of mapping according to the vibration position, the mapping representing a change in the transmission signal due to propagation through the optical fiber, acting on a result of the wavelength dispersion reapplication processing and a result of the transmission signal estimation processing.
1 . An estimation device comprising:
a processor;
a storage medium having computer program instructions stored thereon, wherein the computer program instruction, when executed by the processor, perform processing of:
estimating a vibration position that is a position on an optical fiber where vibration is induced by vibration of an external environment based on a reception signal that is a result of propagation of a transmission signal that is an optical signal transmitted by a transmitter through the optical fiber, wherein
estimation processing is executed, including:
compensation processing including wavelength dispersion compensation processing of compensating for wavelength dispersion with respect to the reception signal,
transmission signal estimation processing of estimating the transmission signal based on a result of the wavelength dispersion compensation processing,
wavelength dispersion reapplication processing of reapplying the wavelength dispersion to a result of the compensation processing, and
vibration position estimation processing of estimating the vibration position based on a result of inverse mapping of mapping according to the vibration position, the mapping representing a change in the transmission signal due to propagation through the optical fiber, acting on a result of the wavelength dispersion reapplication processing and a result of the transmission signal estimation processing.
2 . The estimation device according to claim 1 , wherein
in the vibration position estimation processing, a position having a highest level of similarity between a result of the inverse mapping acting on the result of the wavelength dispersion reapplication processing and the result of the transmission signal estimation processing is estimated as the vibration position.
3 . The estimation device according to claim 1 , wherein
the processor executes the estimation processing on a plurality of reception signals having different timings of propagation through the optical fiber.
4 . The estimation device according to claim 1 , wherein
the vibration position estimation processing executes, for one or a plurality of candidates for the vibration position, removal condition optimization processing of estimating a condition for most removing phase noise at the vibration position based on the result of the inverse mapping acting on the result of the wavelength dispersion reapplication processing and the result of the transmission signal estimation processing.
5 . The estimation device according to claim 4 , wherein
in estimation of the condition, a value of phase variation at the vibration position is estimated.
6 . The estimation device according to claim 4 , wherein
in the removal condition optimization processing, a function represented by the n-th order (n is an integer of 1 or more) term of a Taylor expansion of exp(−jε) is used as a function approximating a phase variation at the vibration position.
7 . An estimation method comprising:
estimating a vibration position that is a position on an optical fiber where vibration is induced by vibration of an external environment based on a reception signal that is a result of propagation of a transmission signal that is an optical signal transmitted by a transmitter through the optical fiber, wherein
estimation processing is executed, including:
compensation processing including wavelength dispersion compensation processing of compensating for wavelength dispersion with respect to the reception signal,
transmission signal estimation processing of estimating the transmission signal based on a result of the wavelength dispersion compensation processing,
wavelength dispersion reapplication processing of reapplying the wavelength dispersion to a result of the compensation processing, and
vibration position estimation processing of estimating the vibration position based on a result of inverse mapping of mapping according to the vibration position, the mapping representing a change in the transmission signal due to propagation through the optical fiber, acting on a result of the wavelength dispersion reapplication processing and a result of the transmission signal estimation processing.
8 . A non-transitory computer readable medium which stores a program for causing a computer to function as the estimation device according to claim 1 .