# US 10,313,007 B2 · System performance prediction method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,007 B2 - Document ID: US10313007B2 - Status: Granted - Kind: B2 - Application number: 15/729,008 - Filed: 2017-10-10 - Published: 2018-04-12 - Granted: 2019-06-04 - Earliest claimed: 2016-10-10 - Assignees: Fujitsu Limited - Applicants: Fujitsu Limited - Inventors: Zhenning Tao; Ying Zhao - Web page: https://patentgrep.com/patent/US10313007B2 ## CPC - H04B 10/07953: {Monitoring or measuring OSNR, BER or Q} - H04B 10/073: using an out-of-service signal (H04B10/071 takes precedence) - H04B 10/07955: {Monitoring or measuring power} - H04B 10/25: Arrangements specific to fibre transmission - H04B 10/079: using measurements of the data signal - H04B 10/0795: {Performance monitoring; Measurement of transmission parameters} - H04B 10/40: Transceivers - H04B 10/50: Transmitters - H04B 10/60: Receivers - H04B: TRANSMISSION ## Abstract A system performance prediction method and apparatus where the transmission system performance prediction apparatus includes: a calculating unit configured to calculate system performance at second power according to first power of a signal and a first noise component generated by the system at the first power. With the above system performance prediction apparatus, by changing power and predicting the system performance by using noise components at different power, accuracy of the prediction of the system performance may be improved, and problems in the related art may be avoided that in predicting system performance, a large-capacity database needs to be prepared and accuracy of the prediction of the system performance is low. ## Claims ### Claim 1 An apparatus, used to calculate transmission system performance, comprising: a memory that stores a plurality of instructions; and a processor coupled to the memory and configured to execute the plurality of instructions to: calculate at least one second noise component at a second power according to a first power of a signal and at least one first noise component generated by the transmission system at the first power; and calculate the transmission system performance at the second power according to the at least one second noise component, wherein the first power includes a first base channel calibration power and a first neighboring channel calibration power, and the second power includes a second base channel power and a second neighboring channel power; and wherein, the processor configured to execute the plurality of instructions to one of: take a product of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is a linear noise component; take a product of a power of three of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is an optical fiber transmission intra-channel nonlinear distortion, take a product of a square of a ratio of the second neighboring channel power to the first neighboring channel calibration power and a ratio of a second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is an optical fiber transmission inter-channel nonlinear distortion, and take a product of a power of α of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is a receiver noise; where, α is not 1 and 0; and take the first noise component as the second noise component when the first noise component is a constant noise component. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the at least one first noise component and the at least one second noise component include one of a linear noise component, a nonlinear noise component, and a constant noise component. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the transmission system performance is at least one of a signal to noise ratio, or a bit error rate, or a Q value. ### Claim 4 (depends on 2) The apparatus according to claim 2, wherein when the transmission system performance is a signal to noise ratio, the processor is configured to execute the plurality of instructions to: use a ratio of a second base channel power to a sum of at least one second noise component as the signal to noise ratio, and wherein, the second power includes the second base channel power and a second neighboring channel power. ### Claim 5 (depends on 1) The apparatus according to claim 1, wherein the at least one first noise component and the at least one second noise component include two of a linear noise component, a nonlinear noise component, a constant noise component. ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein the at least one first noise component and the at least one second noise component include a linear noise component, a nonlinear noise component, and a constant noise component. ### Claim 7 (depends on 2, 5, 6) The apparatus according to any one of claim 2, 5 or 6, wherein the linear noise component includes one of: a transmitter noise, or a transmitter noise and an optical fiber transmission linear distortion; the nonlinear noise component includes: an optical fiber transmission intra-channel nonlinear distortion and an optical fiber transmission inter-channel nonlinear distortion; the constant noise component includes: an amplified spontaneous emission noise, or an amplified spontaneous emission noise and a receiver noise; a transmitter noise and a receiver noise, or a transmitter noise, a receiver noise and an optical fiber transmission linear distortion; the nonlinear noise component includes: an optical fiber transmission intra-channel nonlinear distortion and an optical fiber transmission inter-channel nonlinear distortion; and the constant noise component includes: an amplified spontaneous emission noise; and, a transmitter noise, or a transmitter noise and an optical fiber transmission linear distortion; the nonlinear noise component includes: an optical fiber transmission intra-channel nonlinear distortion, an optical fiber transmission inter-channel nonlinear distortion and a receiver noise; and the constant noise component includes: an amplified spontaneous emission noise. ### Claim 8 A transmission system performance prediction method, including: calculating, by a processor in an apparatus, at least one second noise component at a second power according to a first power of a signal and at least one first noise component generated by the transmission system at the first power; and calculating, by the processor in the apparatus, the transmission system performance at the second power according to at least one second noise component; wherein the first power includes a first base channel calibration power and a first neighboring channel calibration power, and the second power includes a second base channel power and a second neighboring channel power; and wherein, the calculating at least one second noise component at the second power according to the first power of the signal and at least one first noise component at the first power includes one of: taking, by the processor in the apparatus, a product of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is a linear noise component; taking, by the processor in the apparatus, a product of a power of three of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is an optical fiber transmission intra-channel nonlinear distortion, taking a product of a square of a ratio of the second neighboring channel power to the first neighboring channel calibration power and a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is an optical fiber transmission inter-channel nonlinear distortion, and taking a product of a power of α of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is a receiver noise; where, α is not 1 and 0; and taking, by the processor in the apparatus, the first noise component as the second noise component when the first noise component is a constant noise component. ### Claim 9 (depends on 8) The method according to claim 8, wherein the at least one first noise component and the at least one second noise component include one of a linear noise component, a nonlinear noise component, and a constant noise component. ### Claim 10 (depends on 8) The method according to claim 8, wherein the at least one first noise component and the at least one second noise component include two of a linear noise component, a nonlinear noise component, a constant noise component. ### Claim 11 (depends on 8) The method according to claim 8, wherein the at least one first noise component and the at least one second noise component include a linear noise component, a nonlinear noise component, and a constant noise component. ### Claim 12 (depends on 9, 10, 11) The method according to any of claim 9, 10 or 11, wherein the linear noise component includes one of: a transmitter noise, or a transmitter noise and an optical fiber transmission linear distortion; the nonlinear noise component includes: an optical fiber transmission intra-channel nonlinear distortion and an optical fiber transmission inter-channel nonlinear distortion; the constant noise component includes: an amplified spontaneous emission noise, or an amplified spontaneous emission noise and a receiver noise; a transmitter noise and a receiver noise, or a transmitter noise, a receiver noise and an optical fiber transmission linear distortion; the nonlinear noise component includes: an optical fiber transmission intra-channel nonlinear distortion and an optical fiber transmission inter-channel nonlinear distortion; and the constant noise component includes: an amplified spontaneous emission noise; and a transmitter noise, or a transmitter noise and an optical fiber transmission linear distortion; the nonlinear noise component includes: an optical fiber transmission intra-channel nonlinear distortion, an optical fiber transmission inter-channel nonlinear distortion and a receiver noise; and the constant noise component includes: an amplified spontaneous emission noise. ### Claim 13 (depends on 8) The method according to claim 8, wherein the transmission system performance is at least one of a signal to noise ratio, or a bit error rate, or a Q value. ### Claim 14 (depends on 8) The method according to claim 8, wherein when the transmission system performance is a signal to noise ratio, a ratio of second base channel power to a sum of at least one second noise component is taken as the signal to noise ratio; and wherein, the second power includes the second base channel power and second neighboring channel power. ### Claim 15 (depends on 8) A non-transitory computer readable storage medium storing a method according to claim 8 for controlling a computer.