Estimation device, node device, estimation method, optical network system, and program

Abstract

This provides a network technology that enables faster Raman tilt estimation and compensation. [Solution] An estimation device for estimating the Raman tilt of an optical transmission path in an all-photonics network, the estimation device comprising: acquisition means for acquiring the utilization status of each wavelength used in the optical transmission path and the optical power of each wavelength used at the exit of adjacent nodes of the optical transmission path; determination means for determining the number of divisions; and Raman tilt calculation means for estimating the Raman tilt using an integral formula in which each of the subbands obtained by dividing the entire utilization bandwidth into the number of divisions is used as an integral step, with the utilization status of each wavelength used, the optical power of each wavelength used, a loss coefficient determined by the fiber type of the optical transmission path, a link distance defined as the distance between adjacent nodes, and the Raman coefficient as parameters.

Claims

1. An estimation device for estimating the Raman tilt of an optical transmission path in an all-photonic network, An acquisition means for acquiring the utilization status of each wavelength used in the optical transmission path and the optical power of each wavelength used at the exit of an adjacent node of the optical transmission path, A means for determining the number of divisions, A Raman tilt calculation means for estimating the Raman tilt using an integral formula in which each of the subbands obtained by dividing the entire usable bandwidth into the aforementioned number of divisions is used as an integral step, with parameters being the utilization status of each of the aforementioned wavelengths, the optical power of each of the aforementioned wavelengths, the loss coefficient determined by the fiber type of the optical transmission path, the link distance defined as the distance between adjacent nodes, and the Raman coefficient. An estimation device equipped with the following features.

2. The system further includes a holding mechanism for maintaining the calculated Raman tilt. The estimation device according to claim 1.

3. The estimation device according to claim 1 or 2, An optical transmission path that transmits optical signals from adjacent nodes, An optical amplifier connected to the optical transmission path and which amplifies the optical signal, An equalizer connected to the optical amplifier to correct the optical signal, A tap coupler that extracts a portion of the optical output of the equalizer, An optical switch connected to the equalizer, which switches the direction of the optical signal, An optical transceiver connected to the optical switch and which adds / drops client signals to the optical switch, A device controller that controls the optical amplifier, the equalizer, the tap coupler, the optical switch, and the optical transceiver, A node device equipped with the following features.

4. The system further includes an equalizer adjustment means for correcting the power of the plurality of subbands based on the Raman tilt calculated by the Raman tilt calculation means. The node device according to claim 3.

5. A Raman tilt measurement means for measuring the power of an arbitrary measurement channel from the optical output extracted by the tap coupler, A flatness calculation means that calculates flatness based on the power of the measurement channel measured by the Raman tilt measurement means, To further enhance The node device according to claim 4.

6. The system further includes a means for changing the number of divisions if the calculated flatness exceeds a predetermined threshold. The node device according to claim 5.

7. An estimation method for estimating the Raman tilt of an optical transmission path in an all-photonic network, The utilization status of each wavelength in the optical transmission path, and the optical power of each wavelength at the adjacent node exit of the optical transmission path are to be acquired. Determining the number of divisions, The Raman tilt is estimated using an integral formula in which each of the subbands obtained by dividing the entire usable bandwidth into the aforementioned number of divisions is used as an integral step, with parameters being the utilization status of each of the aforementioned wavelengths, the optical power of each of the aforementioned wavelengths, the loss coefficient determined by the fiber type of the optical transmission line, the link distance defined as the distance between adjacent nodes, and the Raman coefficient. An estimation method that includes the following features.

8. A plurality of node devices as described in claim 3, and a control of the plurality of node devices Optical network system.

9. A program for causing a computer to function as an estimation device according to claim 1, wherein the acquisition means, the determination means, and the Raman tilt calculation means are all functions of the computer.

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