CN109946047B - Technology for measuring phase frequency noise characteristics of weak laser signals - Google Patents
Technology for measuring phase frequency noise characteristics of weak laser signals Download PDFInfo
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- CN109946047B CN109946047B CN201910260022.4A CN201910260022A CN109946047B CN 109946047 B CN109946047 B CN 109946047B CN 201910260022 A CN201910260022 A CN 201910260022A CN 109946047 B CN109946047 B CN 109946047B
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Abstract
The invention discloses a weak laser signal phase-frequency noise characteristic measurement technology, which comprises a weak laser light source to be measured, an erbium-doped fiber amplifier, a coupler, a 120-degree phase difference interferometer and an industrial personal computer; the weak laser light source to be detected amplifies weak signals of the light source through the erbium-doped fiber amplifier, the amplified light source signals are divided into two light sources through the coupler, the first light source is used for testing the phase-frequency noise characteristic of the weak laser light source to be detected, the second light source is used for feeding back the amplified light source signals to the power detection unit, and the light power incident to the 120-degree phase difference interferometer is guaranteed to be maintained at the same level; the first beam of light source is incident on the 120-degree phase difference interferometer, and the 120-degree phase difference interferometer is used for demodulating the differential phase information of the first beam of light source signal and transmitting the differential phase information to the industrial personal computer for analysis. The invention realizes the phase frequency noise characteristic test of the weak signal and is beneficial to researching the influence of the weak signal on the performance of the whole system.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a technology for measuring phase frequency noise characteristics of weak laser signals.
Background
When laser is transmitted along a long-distance optical fiber link, in order to ensure that the laser is not affected by the stimulated brillouin effect, it is generally required to ensure that the transmitted light is below the stimulated brillouin threshold, and therefore, the signal light at the receiving end is generally weak. In order to better study the characteristics of the signal light and deeply study the influence of the signal light on a subsequent system, we need to accurately characterize and measure the phase-frequency noise characteristics of the signal light.
In 2013, flying in the shanghai optical engine, et al proposed a phase-frequency noise test technique for a single-frequency laser based on a 120-degree phase-difference interferometer (prior art one). The method is mainly based on the interferometer measurement principle and skillfully borrows the idea of coherent detection, namely, an additional variable is added, then adaptive phase demodulation is carried out through a digital processing algorithm, and phase-related parameters can be accurately represented and measured. However, this method requires an incident power of about 10dBm due to the loss of the whole interference system and the signal-to-noise ratio of the system, so the weak laser signal cannot be directly measured by the proposed system.
In 2017, the Minoru Yamada research group of Malaysia-Japan International technology institute studied the noise evolution law in the weak signal amplification process in detail (prior art II). The results show that the density of the erbium ions and the spontaneous emission in the fiber amplifier do not affect the phase frequency noise characteristics of the laser. Therefore, an idea is provided for improving the signal-to-noise ratio of the phase-frequency noise characteristic test of the weak laser signal.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a technology for measuring the phase-frequency noise characteristics of weak laser signals aiming at the defects of the prior art.
The technical scheme is as follows: the invention relates to a weak laser signal phase-frequency noise characteristic measurement technology, which comprises a weak laser light source to be measured, an erbium-doped fiber amplifier, a coupler, a 120-degree phase difference interferometer and an industrial personal computer; the weak laser light source to be detected amplifies weak signals of the light source through the erbium-doped fiber amplifier, the amplified light source signals are divided into two light sources through the coupler, the first light source is used for testing the phase-frequency noise characteristic of the weak laser light source to be detected, the second light source is used for feeding back the amplified light source signals to the power detection unit, and the light power incident to the 120-degree phase difference interferometer is guaranteed to be maintained at the same level; the first beam of light source is incident on the 120-degree phase difference interferometer, and the 120-degree phase difference interferometer is used for demodulating the differential phase information of the first beam of light source signal and transmitting the differential phase information to the industrial personal computer for analysis; the second light source feeds back to the power detection unit, and the power control unit detects whether the light power entering the 120-degree phase difference interferometer maintains the same level or not; and the second light source output by the power control unit compares whether the set light power is equal to the light power fed back by the feedback control unit, and if the set light power is not equal to the light power fed back by the feedback control unit, the feedback control unit actively feeds back and changes the gain coefficient of the erbium-doped fiber amplifier.
Preferably, the weak laser light source 1 to be detected is a weak laser signal or other weak light signals after passing through the long optical fiber link.
Preferably, the weak laser light source 1 to be measured is signal light of a commercial fiber bragg distribution feedback type fiber laser after passing through a 100km fiber link, and the power of the signal light is-60 dBm.
Preferably, the industrial personal computer analyzes the differential phase information obtained by the 120-degree phase difference interferometer 4, and further obtains other phase frequency noise parameters related to the phase.
Has the advantages that: (1) the amplified optical signal is divided into the first beam of light source and the second beam of light source through the coupler, the first beam of light source directly enters the 120-degree phase difference interferometer, the size of the incident light can be not limited, the measurement of a weak optical signal can be realized, and the method can be better applied to the fields of optical fiber optical frequency transmission, coherent optical communication and the like; according to the invention, the power of the incident 120-degree phase difference interferometer is controlled externally without changing the original phase frequency noise characteristic of the laser signal, so that the phase frequency noise characteristic test of the weak optical signal is realized, and the influence of the weak optical signal on the performance of the whole system is favorably researched;
(2) the method combines the weak laser signal amplification technology and the single-frequency laser phase-frequency noise characteristic testing technology based on the 120-degree phase difference interferometer, controls the light power entering the testing system through the feedback control unit, improves the signal-to-noise ratio of the testing system, and more comprehensively and accurately represents the phase-frequency noise characteristic of the weak laser signal.
Drawings
FIG. 1 is a block diagram of a measurement technique according to the present invention;
wherein, 1-weak laser light source to be detected; 2-erbium doped fiber amplifier; a 3-coupler; 31-a first beam source; 32-a second beam of light; 4-120 degree phase difference interferometer; 5-a power detection unit; 6-a feedback control unit; 7-industrial personal computer.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example (b): a weak laser signal phase-frequency noise characteristic measurement technology comprises a weak laser light source 1 to be measured, an erbium-doped fiber amplifier, a coupler 3, a 120-degree phase difference interferometer 4 and an industrial personal computer 7; the weak laser light source 11 to be detected is a weak laser signal or other weak light signals after passing through a long optical fiber link, in the embodiment, the weak laser light source 11 to be detected is signal light of a commercial optical fiber Bragg distribution feedback type optical fiber laser after passing through a 100km optical fiber link, the power of the signal light is-60 dBm, the weak laser light source 1 to be detected amplifies the weak signal of the light source through an erbium-doped optical fiber amplifier, the amplified light source signal is divided into two light sources through a coupler 3, the first light source 31 is used for testing the phase-frequency noise characteristic of the weak laser light source 1 to be detected, the second light source 32 is used for feeding back the amplified light source signal to the power detection unit 5, and the light power incident to the 120-degree phase-difference interferometer 4 is guaranteed to be maintained at the same; the first beam of light source 31 is incident on the 120-degree phase difference interferometer 4, the 120-degree phase difference interferometer 4 is used for demodulating the differential phase information of the first beam of light source 31 signal and transmitting the differential phase information to the industrial personal computer 7 for analysis, and the industrial personal computer 7 analyzes the differential phase information obtained by the 120-degree phase difference interferometer 4 and further obtains other phase frequency noise parameters related to the phase; the second light source 32 is fed back to the power detection unit 5, and the power control unit detects whether the light power entering the 120-degree phase difference interferometer 4 maintains the same level; the second light source 32 output by the power control unit compares the set optical power with the optical power fed back by the feedback control unit 6, and if the set optical power is not equal to the optical power fed back, the feedback control unit 6 actively feeds back and changes the gain coefficient of the erbium-doped fiber amplifier 2.
The specific operation steps of the invention are as follows:
1. measuring the power of a weak laser light source 1 to be detected;
2. adjusting the gain coefficient of the erbium-doped fiber amplifier 2 according to the power of the weak laser light source 1 to be measured, and outputting an optical signal of the second light source 32 by the measuring coupler 3 to ensure that the optical power incident to the 120-degree phase difference interferometer 4 is 10 dBm;
3. according to the value of the optical signal of the second light source 32 output by the coupler 3 measured by the power detection unit 5, the gain coefficient of the erbium-doped fiber amplifier 2 is actively changed in a feedback mode through the feedback control unit 6;
4. the industrial personal computer 7 analyzes and calculates the differential phase information obtained by the 120-degree phase difference interferometer 4, and obtains other phase-related noise parameters according to the relation between the phase frequency noise parameters.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A weak laser signal phase frequency noise characteristic measurement technology is characterized in that: the device comprises a weak laser light source to be detected, an erbium-doped fiber amplifier, a coupler, a 120-degree phase difference interferometer and an industrial personal computer; the weak laser light source to be detected amplifies weak signals of the light source through the erbium-doped fiber amplifier, the amplified light source signals are divided into two light sources through the coupler, the first light source is used for testing the phase-frequency noise characteristic of the weak laser light source to be detected, the second light source is used for feeding back the amplified light source signals to the power detection unit, and the light power incident to the 120-degree phase difference interferometer is guaranteed to be maintained at the same level; the first beam of light source is incident on the 120-degree phase difference interferometer, and the 120-degree phase difference interferometer is used for demodulating the differential phase information of the first beam of light source signal and transmitting the differential phase information to the industrial personal computer for analysis; the second light source feeds back to the power detection unit, and the power control unit detects whether the light power entering the 120-degree phase difference interferometer maintains the same level or not; and the second light source output by the power control unit compares whether the set light power is equal to the light power fed back by the feedback control unit, and if the set light power is not equal to the light power fed back by the feedback control unit, the feedback control unit actively feeds back and changes the gain coefficient of the erbium-doped fiber amplifier.
2. The technique for measuring the phase-frequency noise characteristics of the weak laser signals according to claim 1, wherein: the weak laser light source 1 to be detected is a weak laser signal passing through the long optical fiber link.
3. The technique for measuring the phase-frequency noise characteristics of the weak laser signal according to claim 2, wherein: the weak laser light source 1 to be detected is signal light of a commercial fiber Bragg distributed feedback type fiber laser after passing through a 100km fiber link, and the power of the signal light is-60 dBm.
4. The technique for measuring the phase-frequency noise characteristics of the weak laser signals according to claim 1, wherein: the industrial personal computer analyzes the differential phase information obtained by the 120-degree phase difference interferometer 4.
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