CN110763436A - Optical fiber dispersion measurement method and system based on dual-wavelength mode-locked optical fiber laser - Google Patents

Optical fiber dispersion measurement method and system based on dual-wavelength mode-locked optical fiber laser Download PDF

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CN110763436A
CN110763436A CN201911095300.1A CN201911095300A CN110763436A CN 110763436 A CN110763436 A CN 110763436A CN 201911095300 A CN201911095300 A CN 201911095300A CN 110763436 A CN110763436 A CN 110763436A
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dispersion
optical fiber
dual
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夏汉定
许党朋
田小程
范孟秋
周丹丹
朱娜
彭志涛
陈波
郑奎兴
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Laser Fusion Research Center China Academy of Engineering Physics
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    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
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    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract

The invention discloses a method and a system for measuring optical fiber dispersion based on a dual-wavelength mode-locked optical fiber laser, which can accurately measure intracavity net dispersion and optical fiber dispersion according to the relationship between the frequency interval of dual-wavelength mode-locked pulses and the central wavelength interval of dual-wavelength soliton pulses. The position of Kelly sideband in traditional soliton spectrum can be used to measure intracavity net dispersion and optical fiber dispersion, the method needs to test the width of soliton pulse and the offset of each level sideband relative to central wavelength, and the test of ultrashort pulse width needs autocorrelator, and the alignment adjustment is relatively complex. Therefore, compared with a method for testing dispersion by adopting a Kelly sideband, the method for measuring the optical fiber dispersion based on the dual-wavelength mode-locked optical fiber laser is a simpler, more effective and more accurate calculation method, and has the advantages of simple operation, low cost and the like.

Description

Optical fiber dispersion measurement method and system based on dual-wavelength mode-locked optical fiber laser
Technical Field
The invention relates to the field of optical fiber measurement, in particular to an optical fiber dispersion measurement method and system based on a dual-wavelength mode-locked optical fiber laser.
Background
In high-speed optical transmission systems, fiber dispersion is one of the important parameters affecting transmission performance. Because of the presence of chromatic dispersion, the transmission rates of different wavelengths of light in an optical fiber are not the same. The optical signal transmitted in the optical fiber is not monochromatic, so that the pulse is broadened, further causing crosstalk between adjacent patterns, thereby affecting the communication quality. Therefore, in an optical transmission system, a dispersion compensation device is required to compensate the dispersion of a transmission fiber, and then the dispersion compensation is premised on measuring the dispersion coefficients of the fiber to be compensated and the dispersion compensation device.
The current methods for measuring chromatic dispersion mainly include time delay method, phase shift method and interference method. These methods have disadvantages, and the time delay method requires a pulse laser with high cost and has low measurement accuracy. The phase shift method requires a high adjustment accuracy of the light source, which makes the overall apparatus expensive. The interference method is easy to introduce errors in the coherence process of the two beams of light, so that the deviation of the measured value is caused.
The position of Kelly sideband in traditional soliton spectrum can be used to measure intracavity net dispersion and optical fiber dispersion, the method needs to test the width of soliton pulse and the offset of each level sideband relative to central wavelength, and the test of ultrashort pulse width needs autocorrelator, and the alignment adjustment is relatively complex.
Therefore, when measuring the optical fiber dispersion, how to reduce the measurement cost and simplify the measurement process on the premise of ensuring small measurement error becomes a difficult problem that needs to be solved in the present society.
Disclosure of Invention
The invention aims to provide a method and a system for measuring optical fiber dispersion based on a dual-wavelength mode-locked optical fiber laser, which improve the measurement precision of optical fiber dispersion, simplify the process of measuring optical fiber dispersion and reduce the cost of measuring optical fiber dispersion.
In order to achieve the purpose, the invention provides the following scheme:
the optical fiber dispersion measuring method based on the dual-wavelength mode-locked optical fiber laser is used for measuring the dispersion of an optical fiber and comprises the following steps:
acquiring a first working pulse output by the dual-wavelength mode-locked fiber laser in a dual-wavelength soliton mode-locked state;
acquiring a first frequency interval and a first central wavelength interval of the first working pulse;
calculating a first average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first frequency interval and the first center wavelength interval;
calculating a first net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first average dispersion;
subtracting a set length from the optical fiber in the dual-wavelength mode-locking optical fiber laser, and acquiring a second working pulse output by the dual-wavelength soliton mode-locking state of the dual-wavelength mode-locking optical fiber laser;
acquiring a second frequency interval and a second central wavelength interval of the second working pulse;
calculating a second average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second frequency interval and the second center wavelength interval;
calculating a second net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second average dispersion;
and calculating the dispersion of the optical fiber according to the set length, the first net dispersion and the second net dispersion.
Optionally, according to a formula
Figure BDA0002268154430000021
Calculating the first average dispersion;
where c is the speed of light in vacuum, n is the refractive index of the fiber, Δ f1For said first frequency interval, Δ λc1Is the first center wavelength interval, L1For the initial length of the optical fiber,
Figure BDA0002268154430000022
is the first average dispersion.
Optionally, according to a formula
Figure BDA0002268154430000023
Calculating the first net dispersion;
wherein D is1Is said first net dispersion, L1For the initial length of the optical fiber,
Figure BDA0002268154430000024
is the first average dispersion.
Optionally, according to a formula
Figure BDA0002268154430000025
Calculating the second average dispersion;
wherein, Δ f2For the first frequency interval, c is the speed of light in vacuum, n is the refractive index of the fiber,
Figure BDA0002268154430000031
is said second average dispersion, Δ λc2Is the second center wavelength interval, L1For the initial fiber length, Δ L is the set length of the fiber that is trimmed.
Optionally, according to a formula
Figure BDA0002268154430000032
Calculating the second net dispersion;
wherein D is2Is the second net dispersion，L1For the initial length of the optical fiber,
Figure BDA0002268154430000033
is the second average dispersion.
Optionally, according to a formula
Figure BDA0002268154430000034
Calculating the dispersion of the optical fiber;
wherein D is the dispersion of the optical fiber, D1For said first net dispersion, D2For the second net dispersion, Δ L is the set length of the fiber that is trimmed.
In order to achieve the above purpose, the invention also provides the following scheme:
optical fiber dispersion measurement system based on dual wavelength mode locking fiber laser includes:
the first working pulse acquisition unit is used for acquiring a first working pulse output by the dual-wavelength mode-locked fiber laser in a dual-wavelength soliton mode-locked state;
the first frequency interval acquisition unit is connected with the first working pulse acquisition unit and used for acquiring a first frequency interval of the first working pulse;
a first central wavelength interval obtaining unit, connected to the first working pulse obtaining unit, for obtaining a first central wavelength interval of the first working pulse;
a first average dispersion obtaining unit, connected to the first frequency interval obtaining unit and the first center wavelength interval obtaining unit, respectively, for calculating a first average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first frequency interval and the first center wavelength interval;
the first net dispersion obtaining unit is connected with the first average dispersion obtaining unit and used for calculating first net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first average dispersion;
the second working pulse acquisition unit is used for subtracting a set length from the optical fiber in the dual-wavelength mode-locked fiber laser and acquiring a second working pulse output by the dual-wavelength soliton of the dual-wavelength mode-locked fiber laser in a mode-locked state;
the second frequency interval acquisition unit is connected with the second working pulse acquisition unit and used for acquiring a second frequency interval of the second working pulse;
a second central wavelength interval obtaining unit, connected to the second working pulse obtaining unit, for obtaining a second central wavelength interval of the second working pulse;
a second average dispersion obtaining unit, connected to the second frequency interval obtaining unit and the second center wavelength interval obtaining unit, respectively, for calculating a second average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second frequency interval and the second center wavelength interval;
the second net dispersion obtaining unit is connected with the second average dispersion obtaining unit and used for calculating second net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second average dispersion;
and the dispersion acquisition unit is respectively connected with the first net dispersion acquisition unit and the second net dispersion acquisition unit and is used for calculating the dispersion of the optical fiber according to the set length, the first net dispersion and the second net dispersion.
Optionally, the first average dispersion obtaining unit uses a formula
Acquiring the first average dispersion;
where c is the speed of light in vacuum, n is the refractive index of the fiber, Δ f1For said first frequency interval, Δ λc1Is the first center wavelength interval, L1For the initial length of the optical fiber,
Figure BDA0002268154430000042
is the first average dispersion.
Optionally, the first net dispersion obtaining unit uses a formula
Figure BDA0002268154430000043
Calculating the first net dispersion;
wherein D is1Is said first net dispersion, L1For the initial length of the optical fiber,
Figure BDA0002268154430000044
is the first average dispersion.
Optionally, the dispersion obtaining unit uses a formula
Figure BDA0002268154430000045
Calculating the dispersion of the optical fiber;
wherein D is the dispersion of the optical fiber, D1For said first net dispersion, D2For the second net dispersion, Δ L is the set length of the fiber that is trimmed.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, after the first frequency interval and the first central wavelength interval of the optical fiber to be measured are measured, the first average dispersion of the optical fiber to be measured is calculated by using a formula, and then the net dispersion of the optical fiber to be measured is calculated according to the first average dispersion of the optical fiber to be measured and the length of the optical fiber to be measured. And then, subtracting the set length of the optical fiber to be detected, measuring a second frequency interval and a second center wavelength interval of the trimmed optical fiber to be detected, calculating second average dispersion and second net dispersion by using a formula, and finally calculating the dispersion of the optical fiber to be detected according to the first net dispersion and the second net dispersion. The invention only needs to measure the frequency interval and the central wavelength interval of the optical fiber, and other parameters can be obtained by calculation, thereby avoiding the error caused by measuring related parameters to a certain extent and indirectly improving the precision of measuring the dispersion value. In addition, the invention only needs to measure the frequency interval and the central wavelength interval of the optical fiber to be measured, has simple operation process and small number of used devices, and can reduce the measurement cost.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a method for measuring optical fiber dispersion based on a dual-wavelength mode-locked fiber laser according to the present invention;
FIG. 2 is a diagram of a system for measuring fiber dispersion based on a dual wavelength mode-locked fiber laser according to the present invention.
Description of the symbols:
a first working pulse acquisition unit-1; a first frequency interval acquisition unit-2; a first center wavelength interval acquisition unit-3; a first average dispersion obtaining unit-4; a first net dispersion obtaining unit-5; a second working pulse acquisition unit-6; a second frequency interval acquisition unit-7; a second center wavelength interval acquisition unit-8; a second average dispersion obtaining unit-9; a second net dispersion obtaining unit-10; and a dispersion acquisition unit-11.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a method and a system for measuring optical fiber dispersion based on a dual-wavelength mode-locked optical fiber laser, which improve the measurement precision of optical fiber dispersion and simplify the process of measuring optical fiber dispersion.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a flow chart of a method for measuring optical fiber dispersion based on a dual-wavelength mode-locked fiber laser according to the present invention, as shown in fig. 1, the method for measuring optical fiber dispersion based on a dual-wavelength mode-locked fiber laser according to the present invention comprises:
step 101: and acquiring a first working pulse output by the dual-wavelength mode-locked fiber laser in a dual-wavelength soliton mode-locked state.
Step 102: acquiring a first frequency interval and a first central wavelength interval of the first working pulse; wherein the first frequency interval and the first center wavelength interval are both measured.
In this example, the fiber to be measured is SMF ((SM Fibe, single mode fiber) with a length of 14.13m, and at this time, the first center wavelength interval is measured to be 28nm and the first frequency interval is measured to be 982 Hz.
Step 103: calculating a first average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first frequency interval and the first center wavelength interval; in particular, according to the formula
Figure BDA0002268154430000061
Calculating the first average dispersion;
where c is the speed of light in vacuum, n is the refractive index of the fiber, Δ f1For said first frequency interval, Δ λc1Is the first center wavelength interval, L1For the initial length of the optical fiber,is the first average dispersion.
According to the formula calculation, the first average dispersion of the optical fiber SMF to be measured in this embodiment is 11.817 ps/(nm.km).
Step 104: calculating a first net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first average dispersion; specifically, according to the formula
Figure BDA0002268154430000063
The first net dispersion is calculated.
Wherein D is1Is said first net dispersion, L1For the initial length of the optical fiber,
Figure BDA0002268154430000064
is the first average dispersion.
Step 105: and subtracting a set length from the optical fiber in the dual-wavelength mode-locking optical fiber laser, and acquiring a second working pulse output by the dual-wavelength soliton mode-locking state of the dual-wavelength mode-locking optical fiber laser.
The set length in this embodiment is 0.5m, but the invention is not limited thereto, and those skilled in the art can adjust the length according to actual needs.
Step 106: acquiring a second frequency interval and a second central wavelength interval of the second working pulse; the second frequency interval and the second center wavelength interval are both measured.
Wherein in this embodiment, the second center wave interval is 26nm and the second frequency interval is 936 Hz.
Step 107: calculating a second average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second frequency interval and the second center wavelength interval; in the present embodiment, according to the formula
Calculating the second average dispersion;
wherein, Δ f2For the first frequency interval, c is the speed of light in vacuum, n is the refractive index of the fiber,
Figure BDA0002268154430000072
is said second average dispersion, Δ λc2Is the second center wavelength interval, L1For the initial fiber length, Δ L is the set length of the fiber that is trimmed.
The second average dispersion of the SMF calculated in this example was 11.615 ps/(nm.km).
Step 108: calculating a second net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second average dispersion;in particular, according to the formula
Figure BDA0002268154430000073
Calculating the second net dispersion;
wherein D is2Is the second net dispersion, L1For the initial length of the optical fiber,
Figure BDA0002268154430000074
is the second average dispersion.
Step 109: and calculating the dispersion of the optical fiber according to the set length, the first net dispersion and the second net dispersion. Wherein according to the formula
Figure BDA0002268154430000075
Calculating the dispersion of the optical fiber;
wherein D is the dispersion of the optical fiber, D1For said first net dispersion, D2For the second net dispersion, Δ L is the set length of the fiber that is trimmed.
The dispersion of the SMF to be measured is 17.352ps/(nm.km) through calculation, and compared with the actual dispersion value of the SMF, which is 18ps/(nm.km), the deviation rate is only 3.6%. Therefore, the optical fiber dispersion measuring method based on the dual-wavelength mode-locked optical fiber laser can ensure the measuring accuracy while simplifying the measuring procedure.
The invention further discloses the following technical effects based on the optical fiber dispersion measurement method of the dual-wavelength mode-locked optical fiber laser:
from the above embodiments, it can be seen that the RF frequency spacing Δ f is based on the dual wavelength mode-locked pulse and the center wavelength spacing Δ λ of the dual wavelength soliton pulsecThe relation between the two can accurately measure the net chromatic dispersion in the cavity and the chromatic dispersion of the optical fiber. It is worth pointing out that the position of the Kelly sideband in the traditional soliton spectrum can also be used to measure the intracavity net dispersion and the fiber dispersion, the method needs to test the width of the soliton pulse and the offset of each stage of sideband relative to the central wavelength, and the test of the ultrashort pulse width needs the autocorrelator, and the alignment adjustment is relatively complicated. Therefore, compared with the method for testing dispersion by adopting Kelly sideband, the invention is based on the dual-wavelength mode-locked fiber laserThe optical fiber dispersion measurement method of the optical device is a simpler, effective and accurate calculation method, and has the advantages of simple operation, low cost and the like.
In order to achieve the above object, the present invention further discloses an optical fiber dispersion measuring system based on a dual-wavelength mode-locked fiber laser, as shown in fig. 2, the optical fiber dispersion measuring system based on the dual-wavelength mode-locked fiber laser of the present invention includes a first working pulse obtaining unit 1, a first frequency interval obtaining unit 2, a first central wavelength interval obtaining unit 3, a first average dispersion obtaining unit 4, a first net dispersion obtaining unit 5, a second working pulse obtaining unit 6, a second frequency interval obtaining unit 7, a second central wavelength interval obtaining unit 8, a second average dispersion obtaining unit 9, a second net dispersion obtaining unit 10, and a dispersion obtaining unit 11.
The first working pulse obtaining unit 1 is used for obtaining a first working pulse output by the dual-wavelength mode-locked fiber laser in a dual-wavelength soliton mode-locked state.
The first frequency interval obtaining unit 2 is connected to the first working pulse obtaining unit 1, and the first frequency interval obtaining unit 2 is configured to obtain a first frequency interval of the first working pulse.
The first central wavelength interval obtaining unit 3 is connected to the first working pulse obtaining unit 1, and the first central wavelength interval obtaining unit 3 is configured to obtain a first central wavelength interval of the first working pulse.
The first average dispersion obtaining unit 4 is connected to the first frequency interval obtaining unit 2 and the first center wavelength interval obtaining unit 3, respectively, and the first average dispersion obtaining unit 4 is configured to calculate a first average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first frequency interval and the first center wavelength interval;
the first average dispersion obtaining unit 4 uses a formula
Figure BDA0002268154430000081
And acquiring the first average dispersion.
Where c is the speed of light in vacuum, n is the refractive index of the fiber, Δ f1For said first frequency interval, Δ λc1Is the first center wavelength interval, L1For the initial length of the optical fiber,
Figure BDA0002268154430000082
is the first average dispersion.
The first net dispersion obtaining unit 5 is connected to the first average dispersion obtaining unit 4, and the first net dispersion obtaining unit 5 is configured to calculate a first net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first average dispersion;
the first net dispersion obtaining unit 5 uses a formula
Figure BDA0002268154430000091
Calculating the first net dispersion;
wherein D is1Is said first net dispersion, L1For the initial length of the optical fiber,
Figure BDA0002268154430000092
is the first average dispersion.
The second working pulse obtaining unit 6 is configured to subtract a set length from an optical fiber in the dual-wavelength mode-locked fiber laser, and obtain a second working pulse output by the dual-wavelength mode-locked fiber laser in a dual-wavelength soliton mode-locked state;
the dispersion obtaining unit 6 uses a formula
Figure BDA0002268154430000093
Calculating the dispersion of the optical fiber;
wherein D is the dispersion of the optical fiber, D1For said first net dispersion, D2For the second net dispersion, Δ L is the set length of the fiber that is trimmed.
The second frequency interval obtaining unit 7 is connected to the second working pulse obtaining unit 6, and the second frequency interval obtaining unit 7 is configured to obtain a second frequency interval of the second working pulse.
The second central wavelength interval obtaining unit 8 is connected to the second working pulse obtaining unit 6, and the second central wavelength interval obtaining unit 8 is configured to obtain a second central wavelength interval of the second working pulse.
The second average dispersion obtaining unit 9 is connected to the second frequency interval obtaining unit 7 and the second center wavelength interval obtaining unit 8, respectively, and the second average dispersion obtaining unit 9 is configured to calculate a second average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second frequency interval and the second center wavelength interval.
The second net dispersion obtaining unit 10 is connected to the second average dispersion obtaining unit 9, and the second net dispersion obtaining unit 10 is configured to calculate a second net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second average dispersion.
The dispersion obtaining unit 11 is connected to the first net dispersion obtaining unit 5 and the second net dispersion obtaining unit 10, respectively, and the dispersion obtaining unit 11 is configured to calculate the dispersion of the optical fiber according to the set length, the first net dispersion, and the second net dispersion.
Based on the prior art, the optical fiber dispersion measurement system based on the dual-wavelength mode-locked optical fiber laser is the same as the optical fiber dispersion measurement method based on the dual-wavelength mode-locked optical fiber laser, and details are not repeated here.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

1. An optical fiber dispersion measurement method based on a dual-wavelength mode-locked fiber laser is used for measuring the dispersion of an optical fiber, and is characterized by comprising the following steps:
acquiring a first working pulse output by the dual-wavelength mode-locked fiber laser in a dual-wavelength soliton mode-locked state;
acquiring a first frequency interval and a first central wavelength interval of the first working pulse;
calculating a first average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first frequency interval and the first center wavelength interval;
calculating a first net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first average dispersion;
subtracting a set length from the optical fiber in the dual-wavelength mode-locking optical fiber laser, and acquiring a second working pulse output by the dual-wavelength soliton mode-locking state of the dual-wavelength mode-locking optical fiber laser;
acquiring a second frequency interval and a second central wavelength interval of the second working pulse;
calculating a second average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second frequency interval and the second center wavelength interval;
calculating a second net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second average dispersion;
and calculating the dispersion of the optical fiber according to the set length, the first net dispersion and the second net dispersion.
2. The method of claim 1 wherein the method is based on the formula
Figure FDA0002268154420000011
Calculating the first average dispersion;
where c is the speed of light in vacuum, n is the refractive index of the fiber, Δ f1For said first frequency interval, Δ λc1Is the first center wavelength interval, L1For the initial length of the optical fiber,
Figure FDA0002268154420000012
is the first average dispersion.
3. The method of claim 1 wherein the method is based on the formula
Figure FDA0002268154420000013
Calculating the first net dispersion;
wherein D is1Is said first net dispersion, L1For the initial length of the optical fiber,
Figure FDA0002268154420000014
is the first average dispersion.
4. The method of claim 1 wherein the method is based on the formula
Calculating the second average dispersion;
wherein, Δ f2For the first frequency interval, c is the speed of light in vacuum, n is the refractive index of the fiber,
Figure FDA0002268154420000022
is said second average dispersion, Δ λc2Is the second center wavelength interval, L1For the initial fiber length, Δ L is the set length of the fiber that is trimmed.
5. The method of claim 1 wherein the method is based on the formula
Figure FDA0002268154420000023
Calculating the second net dispersion;
wherein D is2Is the second net dispersion, L1For the initial length of the optical fiber,
Figure FDA0002268154420000024
is the second average dispersion.
6. The method of claim 1 wherein the method is based on the formula
Figure FDA0002268154420000025
Calculating the dispersion of the optical fiber;
wherein D is the dispersion of the optical fiber, D1For said first net dispersion, D2For the second net dispersion, Δ L is the set length of the fiber that is trimmed.
7. An optical fiber dispersion measurement system based on a dual-wavelength mode-locked fiber laser, comprising:
the first working pulse acquisition unit is used for acquiring a first working pulse output by the dual-wavelength mode-locked fiber laser in a dual-wavelength soliton mode-locked state;
the first frequency interval acquisition unit is connected with the first working pulse acquisition unit and used for acquiring a first frequency interval of the first working pulse;
a first central wavelength interval obtaining unit, connected to the first working pulse obtaining unit, for obtaining a first central wavelength interval of the first working pulse;
a first average dispersion obtaining unit, connected to the first frequency interval obtaining unit and the first center wavelength interval obtaining unit, respectively, for calculating a first average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first frequency interval and the first center wavelength interval;
the first net dispersion obtaining unit is connected with the first average dispersion obtaining unit and used for calculating first net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the first average dispersion;
the second working pulse acquisition unit is used for subtracting a set length from the optical fiber in the dual-wavelength mode-locked fiber laser and acquiring a second working pulse output by the dual-wavelength soliton of the dual-wavelength mode-locked fiber laser in a mode-locked state;
the second frequency interval acquisition unit is connected with the second working pulse acquisition unit and used for acquiring a second frequency interval of the second working pulse;
a second central wavelength interval obtaining unit, connected to the second working pulse obtaining unit, for obtaining a second central wavelength interval of the second working pulse;
a second average dispersion obtaining unit, connected to the second frequency interval obtaining unit and the second center wavelength interval obtaining unit, respectively, for calculating a second average dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second frequency interval and the second center wavelength interval;
the second net dispersion obtaining unit is connected with the second average dispersion obtaining unit and used for calculating second net dispersion in the cavity of the dual-wavelength mode-locked fiber laser according to the second average dispersion;
and the dispersion acquisition unit is respectively connected with the first net dispersion acquisition unit and the second net dispersion acquisition unit and is used for calculating the dispersion of the optical fiber according to the set length, the first net dispersion and the second net dispersion.
8. The system of claim 7, wherein the first average dispersion obtaining unit utilizes a formula
Figure FDA0002268154420000031
Acquiring the first average dispersion;
where c is the speed of light in vacuum, n is the refractive index of the fiber, Δ f1For said first frequency interval, Δ λc1Is the first center wavelength interval, L1For the initial length of the optical fiber,
Figure FDA0002268154420000032
is the first average dispersion.
9. The system of claim 7, wherein the first net dispersion obtaining unit uses a formula
Figure FDA0002268154420000033
Calculating the first net dispersion;
wherein D is1Is said first net dispersion, L1For the initial length of the optical fiber,
Figure FDA0002268154420000034
is the first average dispersion.
10. The system of claim 7, wherein the dispersion obtaining unit uses a formula
Figure FDA0002268154420000035
Calculating the dispersion of the optical fiber;
wherein D is the dispersion of the optical fiber, D1For said first net dispersion, D2For the second net dispersion, Δ L is the set length of the fiber that is trimmed.
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