CN109946047A - A kind of weak laser signal phase frequency noise characteristic measuring technique - Google Patents
A kind of weak laser signal phase frequency noise characteristic measuring technique Download PDFInfo
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- CN109946047A CN109946047A CN201910260022.4A CN201910260022A CN109946047A CN 109946047 A CN109946047 A CN 109946047A CN 201910260022 A CN201910260022 A CN 201910260022A CN 109946047 A CN109946047 A CN 109946047A
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Abstract
The present invention discloses a kind of weak laser signal phase frequency noise characteristic measuring technique, including weak laser light source to be measured, EDFA Erbium-Doped Fiber Amplifier, coupler, 120 degree of difference interferometers and industrial personal computer；The weak laser light source to be measured amplifies the small-signal of light source by EDFA Erbium-Doped Fiber Amplifier, light source is divided into two bundles by coupler by the light signal of amplification, first light source beam is used to test the phase frequency noise characteristic of weak laser light source to be measured, second light source beam is used to guarantee amplified light signal feedback to power detection unit that the optical power for being incident on 120 degree of difference interferometers to maintain same level；First light source beam is incident on 120 degree of difference interferometers, and 120 degree of differences interferometer is used to demodulate the differential phase information of the first light source beam signal, and passes in industrial personal computer and analyzed.The present invention realizes the phase frequency noise characteristic test of small-signal, is conducive to study influence of the small-signal for whole system performance.
Description
Technical field
The invention belongs to the technical fields of laser, and in particular to a kind of weak laser signal phase frequency noise characteristic measurement skill
Art.
Background technique
When laser is along long-distance optical fiber link transmission, in order to guarantee not influenced by stimulated Brillouin effect, usually need
Guarantee that transmitting light is in excited Brillouin threshold value hereinafter, therefore the signal light of receiving end is generally fainter.In order to preferably
The characteristic of signal light is studied, furthers investigate influence of the signal light to follow-up system, it would be desirable to accurately characterize and measure its phase
Frequency noise characteristic.
2013, Shanghai ray machine Yang Fei et al. propose a kind of single-frequency laser phase that interferometer is differed based on 120 degree
The technology (prior art one) of frequency noise testing.This method is based primarily upon interferometer measurement principle and ingenious reference coherent detection
Thought, that is, increasing supplementary variable, then passing through digital processing algorithm carries out adaptive phase demodulating, can accurate table
Sign and measurement obtain the relevant parameter of phase.But it is limited to loss and the system signal noise ratio of entire interference system, this side
It is 10 dBm or so that method, which requires incident power, therefore weak laser signal directly can not be measured directly with proposed system.
2017, Minoru Yamada study group, Malaysia-Japan internationality technical college had studied in detail faint
Noise Evolution (prior art two) in signal amplification process.The result shows that the density and fiber amplifier of bait ion
In spontaneous radiation will not influence the phase frequency noise characteristic of laser.Therefore, this is the phase frequency noise for improving weak laser signal
The signal-to-noise ratio of characteristic test provides a kind of thinking.
Summary of the invention
Goal of the invention: present invention aims in view of the deficiencies of the prior art, provide a kind of weak laser signal phase frequency to make an uproar
Sound characteristics measuring technique.
Technical solution: a kind of weak laser signal phase frequency noise characteristic measuring technique of the present invention, including it is to be measured faint
Laser light source, EDFA Erbium-Doped Fiber Amplifier, coupler, 120 degree of difference interferometers and industrial personal computer；The weak laser light source to be measured
The small-signal for amplifying light source by EDFA Erbium-Doped Fiber Amplifier, is divided into two bundles light by coupler by the light signal of amplification
Source, the first light source beam are used to test the phase frequency noise characteristic of weak laser light source to be measured, and the second light source beam is used for will be amplified
Light signal feedback guarantees that the optical power for being incident on 120 degree of difference interferometers maintains same level to power detection unit；First
Light source beam is incident on 120 degree of difference interferometers, and 120 degree of differences interferometer is used to demodulate the difference of the first light source beam signal
Phase information, and pass in industrial personal computer and analyzed；Second light source beam is fed back to power detection unit, the power control
Whether the optical power that unit detection enters 120 degree of difference interferometers maintains same level；The of power control unit output
Two light source beams compare setting optical power by feedback control unit and whether the optical power fed back is equal, when unequal, then
The gain coefficient of feedback control unit active feedback change erbium-doped fiber amplifier.
Preferably, the weak laser light source 1 to be measured be weak laser signal after long optical fibers link or its
His faint optical signal.
Preferably, the weak laser light source 1 to be measured is Commercial fibers Prague distributed feedback optical fiber laser process
Signal light after 100km optical fiber link, power are -60dBm.
Preferably, the industrial personal computer analysis differs the differential phase information that interferometer 4 obtains by 120 degree, and further
To other relevant phase frequency noise parameters of phase.
The utility model has the advantages that (1) present invention is by be divided into the first light source beam and the through coupler for amplified optical signal
Two light source beams in the directly incident 120 degree of difference interferometers of the first light source beam, can be not only restricted to the size of incident light, Ke Yishi
The measurement of existing faint optical signal can be preferably applied for the transmitting of optical fiber optical frequency, the fields such as coherent light communication；The present invention passes through outer
The power of the incident 120 degree of differences interferometer of portion's control realizes faint light without changing the original phase frequency noise characteristic of laser signal
The phase frequency noise characteristic of signal is tested, and is conducive to study influence of the faint optical signal for whole system performance；
(2) present invention is combined weak laser signal amplification technique and is differed the single-frequency laser phase frequency of interferometer based on 120 degree
Noise characteristic measuring technology enters the size of the optical power of test macro by feedback control unit control, improves test system
The signal-to-noise ratio of system more comprehensively accurately characterizes the phase frequency noise characteristic of weak laser signal.
Detailed description of the invention
Fig. 1 is the structural block diagram of measuring technique of the present invention；
Wherein, 1- weak laser light source to be measured；2- erbium-doped fiber amplifier；3- coupler；The first light source beam of 31-；The second beam of 32-
Light source；4-120 degree differs interferometer；5- power detection unit；6- feedback control unit；7- industrial personal computer.
Specific embodiment
Technical solution of the present invention is described in detail below by attached drawing, but protection scope of the present invention is not limited to
The embodiment.
Embodiment: a kind of weak laser signal phase frequency noise characteristic measuring technique, including weak laser light source 1 to be measured, mix
Bait fiber amplifier, 3,120 degree of difference interferometers 4 of coupler and industrial personal computer 7；Weak laser light source 11 to be measured is through too long light
Weak laser signal or other faint optical signals after fine link, in the present embodiment, weak laser light source 11 to be measured is quotient
With optical fiber Bragg distributed feedback optical fiber laser by the signal light after 100km optical fiber link, power is -60dBm,
Weak laser light source 1 to be measured amplifies the small-signal of light source by EDFA Erbium-Doped Fiber Amplifier, passes through by the light signal of amplification
Coupler 3 is divided into two bundles light source, and the first light source beam 31 is used to test the phase frequency noise characteristic of weak laser light source 1 to be measured, and second
Light source beam 32 is used for amplified light signal feedback to power detection unit 5, and 120 degree of difference interferometers 4 are incident in guarantee
Optical power maintain same level；First light source beam 31 is incident on 120 degree of difference interferometers 4, and 120 degree of difference interferometers 4 are used
It in the differential phase information of demodulation 31 signal of the first light source beam, and passes in industrial personal computer 7 and is analyzed, industrial personal computer 7 is analyzed by 120
The differential phase information that degree difference interferometer 4 obtains, and further obtain other relevant phase frequency noise parameters of phase；Second beam
The feedback of light source 32 arrives power detection unit 5, and whether the optical power that power control unit detection enters 120 degree of difference interferometers 4 is tieed up
Hold same level；Second light source beam 32 of power control unit output compares setting optical power and anti-by feedback control unit 6
Whether equal it is fed back to the optical power come, when unequal, then 6 active feedback of feedback control unit changes erbium-doped fiber amplifier 2
Gain coefficient.
Using the present invention carry out specific steps are as follows:
1. measuring the power of weak laser light source 1 to be measured；
2. measurement coupler 3 is defeated according to the gain coefficient of the power regulation erbium-doped fiber amplifier 2 of weak laser light source 1 to be measured
The optical signal of second light source beam 32 out, the optical power for guaranteeing to be incident on 120 degree of difference interferometers 4 is 10dBm；
3. measuring the value of the optical signal for the second light source beam 32 that obtained coupler 3 exports according to power detection unit 5, pass through
The gain coefficient of 6 active feedback of feedback control unit change erbium-doped fiber amplifier 2；
4. the differential phase information that 120 degree of 7 analytical calculation of industrial personal computer difference interferometers 4 obtain, and according to phase frequency Noise Parameters
Between relationship obtain other relevant noise parameters of phase.
As described above, must not be explained although the present invention has been indicated and described referring to specific preferred embodiment
For the limitation to invention itself.It without prejudice to the spirit and scope of the invention as defined in the appended claims, can be right
Various changes can be made in the form and details for it.
Claims (4)
1. a kind of weak laser signal phase frequency noise characteristic measuring technique, it is characterised in that: including weak laser light source to be measured, mix
Bait fiber amplifier, coupler, 120 degree of difference interferometers and industrial personal computer；The weak laser light source to be measured is by mixing bait light
Fiber amplifier amplifies the small-signal of light source, and the light signal by amplification is divided into two bundles light source, light beam by coupler
Source is used to test the phase frequency noise characteristic of weak laser light source to be measured, and the second light source beam is for feeding back amplified light signal
To power detection unit, guarantee that the optical power for being incident on 120 degree of difference interferometers maintains same level；First light source beam is incident on
On 120 degree of difference interferometers, 120 degree of differences interferometer is used to demodulate the differential phase information of the first light source beam signal, and
It passes in industrial personal computer and is analyzed；Second light source beam feedback to power detection unit, the power control unit detect into
Whether the optical power for entering 120 degree of difference interferometers maintains same level；Second light source beam of the power control unit output is logical
Cross that feedback control unit compares setting optical power and whether the optical power fed back is equal, when unequal, then feedback control list
The gain coefficient of first active feedback change erbium-doped fiber amplifier.
2. a kind of weak laser signal phase frequency noise characteristic measuring technique according to claim 1, it is characterised in that: described
Weak laser light source 1 to be measured is the weak laser signal or other faint optical signals after long optical fibers link.
3. a kind of weak laser signal phase frequency noise characteristic measuring technique according to claim 2, it is characterised in that: described
Weak laser light source 1 to be measured is Commercial fibers Prague distributed feedback optical fiber laser by after 100km optical fiber link
Signal light, power are -60dBm.
4. a kind of weak laser signal phase frequency noise characteristic measuring technique according to claim 1, it is characterised in that: described
Industrial personal computer analysis differs the differential phase information that interferometer 4 obtains by 120 degree, and further obtains other relevant phase frequencies of phase
Noise parameter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111122126A (en) * | 2019-12-31 | 2020-05-08 | 北京灵犀微光科技有限公司 | Optical system definition testing method and device |
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