Method and apparatus for obtaining transmitter test parameter, and storage medium

Patent metadata

Field	Value
Publication number	US-11962344-B2
Application number	US-202217682836-A
Country	US
Kind code	B2
Filing date	Feb 28, 2022
Priority date	Aug 31, 2019
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

Embodiments of this application provide a method and an apparatus for obtaining a transmitter test parameter, and a storage medium. The method includes: performing waveform sampling on an optical signal sent by a transmitter, to obtain a sampled electrical signal, obtaining a first noise amount associated with the sampled electrical signal based on a preset initial noise ratio parameter and a level amplitude of the sampled electrical signal, and obtaining a second noise amount associated with an ideal electrical signal based on the initial noise ratio parameter and a level amplitude of the ideal electrical signal. According to the application, a noise amount associated with a level amplitude of a sampled electrical signal is obtained without limiting a type of a receiver that performs a consistency test on a transmitter by using a transmitter test parameter.

First claim

What is claimed is:

1. A method for obtaining a transmitter test parameter, wherein the method is applied to a hardware processor of an apparatus, and comprises:
performing waveform sampling on an optical signal sent by a transmitter, to obtain a sampled electrical signal;
obtaining a first noise amount associated with the sampled electrical signal based on a preset initial noise ratio parameter and a level amplitude of the sampled electrical signal,
wherein the level amplitude of the sampled electrical signal is greater than a minimum level and less than a maximum level,
wherein the preset initial noise ratio parameter is a ratio of a maximum noise amount to a minimum noise amount,
wherein the maximum noise amount is a noise amount associated with an electrical signal at the maximum level,
wherein the minimum noise amount is a noise amount associated with an electrical signal at the minimum level, and
wherein the first noise amount is a noise amount that is greater than the minimum noise amount and less than the maximum noise amount; and

obtaining a second noise amount associated with an ideal electrical signal based on the initial noise ratio parameter, a first level amplitude of the ideal electrical signal and a second level amplitude of the ideal electrical signal,
wherein an optical modulation amplitude of the ideal electrical signal equals to the optical modulation amplitude of the sampled electrical signal, and
wherein the first level amplitude of the ideal electrical signal is the maximum level, the second level amplitude of the ideal electrical signal is the minimum level, wherein

the first noise amount and the second noise amount are used to perform a consistency test on the transmitter.

2. The method according to claim 1 , wherein obtaining the first noise amount associated with the sampled electrical signal comprises:
determining that the level amplitude of the sampled electrical signal is between the maximum level and the minimum level; and
using the maximum noise amount and the minimum noise amount as an interpolation condition, and performing interpolation calculation on the level amplitude of the sampled electrical signal based on the initial noise ratio parameter to obtain the first noise amount.

3. The method according to claim 2 , wherein using the maximum noise amount and the minimum noise amount as the interpolation condition, and performing the interpolation calculation on the level amplitude of the sampled electrical signal based on the initial noise ratio parameter to obtain the first noise amount comprise:
obtaining a tolerable-noise amount σ G associated with the sampled electrical signal at a preset sampling point;
determining a maximum noise amount σ max associated with the electrical signal at the maximum level according to the following:
σ max =Mσ G , wherein M represents the initial noise ratio parameter;
determining the minimum noise amount associated with the electrical signal at the minimum level is σ G ;
performing quantization between the maximum level and the minimum level to obtain N level values, wherein the N level values are all between the maximum level and the minimum level, and N is a positive integer;
determining N noise amounts respectively associated with the N level values according to a preset interpolation algorithm;
determining that the level amplitude of the sampled electrical signal is a first level value in the N level values; and
obtaining a first noise amount associated with the first level value based on an association between the N level values and the N noise amounts.

4. The method according to claim 1 , wherein obtaining the first noise amount associated with the sampled electrical signal comprises:
obtaining an association between a level amplitude and a noise amount based on the preset initial noise ratio parameter, the maximum noise amount, and the minimum noise amount,
wherein the association between a level amplitude and a noise amount comprises a noise amount associated with each level amplitude that is greater than the minimum level and less than the maximum level; and
searching the association between a level amplitude and a noise amount by using the level amplitude of the sampled electrical signal to obtain the first noise amount.

5. The method according to claim 1 , wherein after performing the waveform sampling on the optical signal sent by the transmitter, the method further comprises:
performing time-domain equalization processing on the sampled electrical signal by using an equalizer, to obtain an equalized electrical signal.

6. The method according to claim 5 , wherein obtaining the first noise amount associated with the sampled electrical signal comprises:
obtaining an equalization parameter associated with the equalizer, wherein the equalization parameter comprises a tap length of the equalizer and a tap coefficient of the equalizer; and
obtaining the first noise amount associated with the equalized electrical signal based on the level amplitude of the sampled electrical signal, the equalization parameter, and the initial noise ratio parameter.

7. The method according to claim 6 , wherein obtaining the first noise amount associated with the equalized electrical signal comprises:
obtaining an association between level amplitudes and noise amounts at consecutive sampling points based on the level amplitude of the sampled electrical signal, the equalization parameter, and the initial noise ratio parameter;
determining a third noise amount associated with the electrical signal at the maximum level and a fourth noise amount associated with the electrical signal at the minimum level based on the association between level amplitudes and noise amounts at consecutive sampling points;
modifying the initial noise ratio parameter based on the third noise amount and the fourth noise amount to obtain a modified noise ratio parameter;
obtaining a noise enhancement factor based on the equalization parameter, wherein the noise enhancement factor represents a noise enhancement degree of the equalizer; and
obtaining the first noise amount associated with the equalized electrical signal based on the level amplitude of the sampled electrical signal, the modified noise ratio parameter, the noise enhancement factor, and an average optical power, wherein the average optical power is an average value of optical powers of the sampled electrical signal at different level amplitudes.

8. The method according to claim 7 , wherein obtaining the first noise amount associated with the equalized electrical signal comprises:
determining the first noise amount σ DUT_estimated associated with the equalized electrical signal according to the following:

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Assignees

• Huawei Tech Co Ltd

Inventors

• Zhang Kuo
• Zhou Lei
• Li Borui
• Li Shengping

Classifications

• H04B10/0795 Primary

  Performance monitoring; Measurement of transmission parameters · CPC title

• H04B10/0799 Primary

  Monitoring line transmitter or line receiver equipment · CPC title

• H04B10/524

  Pulse modulation · CPC title

• H04B10/07953

  Monitoring or measuring OSNR, BER or Q · CPC title