Optical fiber measurement system

An optical fiber measurement method, comprising:

• sending, by a signal generator, a signal light ray to a wavelength-division multiplexer, wherein the signal light ray is a multi-wavelength signal light ray;
• sending, by a first optical time-domain reflectometer, a first measurement light ray and a second measurement light ray to the wavelength-division multiplexer, wherein a wavelength of the first measurement light ray is longer than a maximum wavelength of the multi-wavelength signal light ray, wherein a wavelength of the second measurement light ray shorter than a minimum wavelength of the signal light ray, wherein both a wavelength difference between the wavelength of the first measurement light ray and the maximum wavelength and a wavelength difference between the minimum wavelength and the wavelength of the second measurement light ray are within a preset Raman gain range, and wherein the preset Raman gain range is a maximum wavelength difference that enables two optical signals of different wavelengths to generate an obvious stimulated Raman scattering effect;
• combining, by the wavelength-division multiplexer, the first measurement light ray, the second measurement light ray, and the signal light ray to obtain a combined light ray;
• sending, by the wavelength-division multiplexer, the combined light ray to an optical fiber;
• sending, by the wavelength-division multiplexer, a returned light ray from the optical fiber to the first optical time-domain reflectometer, wherein the returned light ray is based on the combined light ray;
• and
• determining, by the first optical time-domain reflectometer, a performance of the optical fiber based on the returned light ray.

An optical fiber measurement system, comprising:

• a signal generator configured to send a signal light ray;
• a first optical time-domain reflectometer configured to send a first measurement light ray and a second measurement light ray, wherein a wavelength of the first measurement light ray and a wavelength of the second measurement light ray are respectively longer than and shorter than a wavelength of the signal light ray;
• a wavelength-division multiplexer configured to:
• receive the signal light ray from the signal generator;
• receive the first measurement light ray and a second measurement light ray from the first optical time-domain reflectometer;
• combine the first measurement light ray, the second measurement light ray, and the signal light ray to obtain a combined light ray;
• send the combined light ray to an optical fiber;
• and
• send a returned light ray from the optical fiber to the first optical time-domain reflectometer, wherein the returned light ray is based on the combined light ray, and wherein the first optical time-domain reflectometer is further configured to determine a performance of the optical fiber based on the returned light ray;
• and
• a wavelength-division demultiplexer and a second optical time-domain reflectometer connected to the wavelength-division demultiplexer, wherein the wavelength-division multiplexer and the wavelength-division demultiplexer are respectively located at two ends of the optical fiber, wherein the second optical time-domain reflectometer is configured to send a third measurement light ray and a fourth measurement light ray to the wavelength-division demultiplexer, wherein a wavelength of the third measurement light ray and a wavelength of the fourth measurement light ray are respectively longer than and shorter than the wavelength of the signal light ray, wherein the wavelength-division demultiplexer is configured to:
• send the third measurement light ray and the fourth measurement light ray to the optical fiber;
• and
• send a returned light ray from the optical fiber to the second optical time-domain,
• wherein the second optical time-domain reflectometer is further configured to determine performance of the optical fiber in another direction based on the returned light ray, and
• wherein wavelengths of the first measurement light ray, the second measurement light ray, the third measurement light ray, and the fourth measurement light ray are different.