Optical power distribution estimation apparatus, optical power distribution estimation method, and computer program

Patent metadata

Field	Value
Publication number	US-2026058726-A1
Application number	US-202219103630-A
Country	US
Kind code	A1
Filing date	Sep 13, 2022
Priority date	Sep 13, 2022
Publication date	Feb 26, 2026
Grant date	—

Abstract

An optical power distribution estimation device includes: a partial wavelength dispersion application unit that applies, to a signal, partial wavelength dispersion corresponding to a distance from an optical transmission device to an optical power measurement position; a nonlinear operation unit that performs, on the signal to which the partial wavelength dispersion has been applied, nonlinear operation using a linear term obtained by Taylor-expanding a mathematical expression used for phase rotation; a residual dispersion application unit that applies residual wavelength dispersion corresponding to a distance from the optical power measurement position to an optical reception device to the signal subjected to the nonlinear operation by the nonlinear operation unit; and a correlation calculation unit that estimates an optical power distribution of an optical transmission line by obtaining, for each optical power measurement position, a correlation between the signal to which the residual wavelength dispersion has been applied and a reception signal based on an optical signal transmitted from the optical transmission device and received via the optical transmission line.

First claim

1 . An optical power distribution estimation device comprising:
a partial wavelength dispersion applicator configured to apply, to a signal, partial wavelength dispersion corresponding to a distance from an optical transmission device to an optical power measurement position; a nonlinear operator configured to perform, on the signal to which the partial wavelength dispersion has been applied, nonlinear operation using a linear term obtained by Taylor-expanding a mathematical expression used for phase rotation; a residual dispersion applicator configured to apply residual wavelength dispersion corresponding to a distance from the optical power measurement position to an optical reception device to the signal subjected to the nonlinear operation by the nonlinear operator; and a correlation calculator configured to estimate an optical power distribution of an optical transmission line by obtaining, for each optical power measurement position, a correlation between the signal to which the residual wavelength dispersion has been applied and a reception signal based on an optical signal transmitted from the optical transmission device and received via the optical transmission line.

2 . The optical power distribution estimation device according to claim 1 , further comprising
a transmission signal restore configured to restore a transmission signal transmitted by the optical transmission device on a basis of the reception signal, wherein the partial wavelength dispersion applicator applies the partial wavelength dispersion to the restored transmission signal or a signal obtained by performing predetermined processing on the restored transmission signal.

3 . The optical power distribution estimation device according to claim 2 , further comprising
a preprocessor configured to perform the predetermined processing on the transmission signal restored by the transmission signal restorer, wherein: the reception signal is a signal in which an influence caused by the optical transmission line has not been compensated for; the transmission signal restorer restores the transmission signal on a basis of a signal in which the influence caused by the optical transmission line has been compensated for; and as the predetermined processing, the preprocessor applies a value corresponding to the influence caused by the optical transmission line in order to bring the transmission signal close to the reception signal.

4 . The optical power distribution estimation device according to claim 2 , wherein:
the reception signal is a signal in which an influence caused by the optical transmission line has been compensated for; the transmission signal restorer restores the transmission signal on a basis of the signal in which the influence caused by the optical transmission line has been compensated for; and the partial wavelength dispersion applicator applies the partial wavelength dispersion to the restored transmission signal.

5 . An optical power distribution estimation method comprising:
applying, to a signal, partial wavelength dispersion corresponding to a distance from an optical transmission device to an optical power measurement position; performing, on the signal to which the partial wavelength dispersion has been applied, nonlinear operation using a linear term obtained by Taylor-expanding a mathematical expression used for phase rotation; applying residual wavelength dispersion corresponding to a distance from the optical power measurement position to an optical reception device to the signal subjected to the nonlinear operation; and estimating an optical power distribution of an optical transmission line by obtaining, for each optical power measurement position, a correlation between the signal to which the residual wavelength dispersion has been applied and a reception signal based on an optical signal transmitted from the optical transmission device and received via the optical transmission line.

6 . A non-transitory storage medium that stores a program for making a computer perform processes, the processes comprising:
applying, to a signal, partial wavelength dispersion corresponding to a distance from an optical transmission device to an optical power measurement position; performing, on the signal to which the partial wavelength dispersion has been applied, nonlinear operation using a linear term obtained by Taylor-expanding a mathematical expression used for phase rotation; applying residual wavelength dispersion corresponding to a distance from the optical power measurement position to an optical reception device to the signal subjected to the nonlinear operation; and estimating an optical power distribution of an optical transmission line by obtaining, for each optical power measurement position, a correlation between the signal to which the residual wavelength dispersion has been applied and a reception signal based on an optical signal transmitted from the optical transmission device and received via the optical transmission line.

Assignees

• Ntt Inc

Inventors

• Sasai Takeo
• Yamazaki Etsushi
• Nishizawa Hideki
• Sone Yoshiaki
• Kisaka Yoshiaki

Classifications

• H04B10/07951

  Monitoring or measuring chromatic dispersion or PMD · CPC title

• H04B10/07955 Primary

  Monitoring or measuring power · CPC title

• H04B10/075

  using an in-service signal (H04B10/071 takes precedence) · CPC title