CN206922758U - The measuring system of fibre-optical dispersion - Google Patents
The measuring system of fibre-optical dispersion Download PDFInfo
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- CN206922758U CN206922758U CN201720555662.4U CN201720555662U CN206922758U CN 206922758 U CN206922758 U CN 206922758U CN 201720555662 U CN201720555662 U CN 201720555662U CN 206922758 U CN206922758 U CN 206922758U
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Abstract
A kind of measuring system of fibre-optical dispersion, including power supply, two light-pulse generators, testing fiber, detector and oscillograph are the utility model is related to, described power supply, two light-pulse generators, testing fiber, detector and oscillograph are sequentially connected.Using the measuring system of the fibre-optical dispersion of the utility model, user is without buying expensive traditional dispersion tester and testing out the dispersion curve of optical fiber by the device, method of complexity, build by simple link to obtain the platform of chromatic dispersion compensation quantity merely with the equipment such as general pulse light source and oscillograph can, and the methods of across test dispersion curve, the dispersion compensation distance of dispersion compensation module can be measured by corresponding software calculation formula, is with a wide range of applications.
Description
Technical field
It the utility model is related to technical field of optical fiber communication, more particularly to chromatic dispersion measurement technical field, in particular to one kind
The measuring system of fibre-optical dispersion.
Background technology
With flourishing for fiber optic communication field, optical fiber plays more and more important effect in the communications field.Optical fiber
As a kind of information telecommunication media, have message capacity big, traffic rate is high, and stability is good, the advantages that strong antijamming capability.But
It is to be used as optical fiber is more and more extensive, its shortcoming also gradually highlights.Loss, dispersion, it is non-linear be restrict optical fiber
Three big factors of information capability, and being substantially improved with traffic rate are transmitted, dispersion and nonlinear influence seem particularly
It is important.
In current fiber link design, there is the method for maturation for dispersion compensation, i.e., using dispersion compensation module
(DCM) dispersion caused by long-distance link optical fiber is compensated.General dispersion compensation module is with dispersion compensating fiber or light
Fine grating carries out dispersion compensation.Although the dispersion distance that the module is compensated can be indicated on dispersion compensation module, actually
The dispersion that compensate for caused by how many kilometers of single-mode fibers is unknown, and once because this problem causes link communication not
It is logical, it is difficult to expect that this respect can be problematic again, there is very strong fascination.
Ripe chromatic dispersion measurement method has three kinds at present：Impulse method, phase shift method, interferometric method.Wherein phase shift method and difference phase
Shifting method, it is to make method universal used in the producer of chromatic dispersion measurement equipment.
Impulse method is exactly that the optical signal of different wave length is measured using the optical signal of the different wave length after the modulation of same burst pulse
Caused delay inequality, directly calculates abbe number according to definition after optical fiber transmits.This measuring method principle is simple,
But need to use the laser of various different wave lengths, and require that light source output power is stable, it is Wavelength stabilized, and different wave length
Quantity have impact on measuring accuracy.
After the model of different wave length entered same fibre transmission, because different time delays shows the difference of phase shift,
Phase shift method is exactly the optical signal by measuring the different wave length after same sinusoidal signal modulation, caused by after optical fiber transmits
Phase shift difference determines the relation of group delay and wavelength, and then exports a kind of method of abbe number.One reference wavelength is set
For, then for input the flashlight of the different wave length caused phase shift difference after optical fiber transmits be relative to reference wavelength and
Speech.So by measuring the phase-shift value under different wave length, one group of corresponding time delay difference data can be calculated, then by not sharing the same light
Fine group delay formula carries out curve fitting, and so as to obtain the relevant coefficient in abbe number formula, and then tries to achieve the optical fiber
Dispersion curve.
The test philosophy of interferometric method is by the use of two arms of Mach-Zehnder interferometer or Michelson's interferometer as treating
Fiber arm and reference arm are surveyed, changes the length of reference arm, the strength information of the interference fringe of two arm emergent lights is obtained, by strong
Degree information can be converted into the phase information of two light waves.But actual phase value can not be obtained, can only be in frequency domain extraction to phase
Relative difference, and then by calculate can obtain corresponding dispersion values.This method test equipment structure is complicated, and cost is held high
It is expensive, and it is relevant with the inverted population of phase difference to survey fine length, but measuring accuracy can obtain larger guarantee.
Utility model content
The purpose of this utility model is the shortcomings that overcoming above-mentioned prior art, there is provided one kind can realize reduction measurement
The measuring system of the fibre-optical dispersion of the cost of dispersion compensation distance.
To achieve these goals, the utility model has following form：
The measuring system of the fibre-optical dispersion, including power supply, two light-pulse generators, testing fiber, detector and oscillograph, institute
Power supply, two light-pulse generators, testing fiber, detector and the oscillograph stated are sequentially connected.
It is preferred that the wavelength of two described light-pulse generators is unequal, and pass through optical coupling device multiplex.
It is preferred that described light-pulse generator is the Distributed Feedback Laser of different wave length.
It is preferred that it is connected between described light-pulse generator, testing fiber and detector by optical fiber.
It is preferred that described detector is photodetector.
The measuring system of the fibre-optical dispersion in the utility model is employed, user is without buying expensive traditional chromatic dispersion test
Instrument simultaneously tests out the dispersion curve of optical fiber by the device, method of complexity, is set merely with general pulse light source and oscillograph etc.
Standby can builds to obtain the platform of chromatic dispersion compensation quantity by simple link, and across the methods of testing dispersion curve, passes through
Corresponding software calculation formula can measure the dispersion compensation distance of dispersion compensation module, be with a wide range of applications.
Brief description of the drawings
Fig. 1 is the structural representation of the measuring system of fibre-optical dispersion of the present utility model.
Embodiment
In order to more clearly describe technology contents of the present utility model, enter traveling one with reference to specific embodiment
The description of step.
In a kind of specific embodiment, the measuring system of the fibre-optical dispersion, including power supply, two light-pulse generators, treat
Light-metering is fine, detector and oscillograph, described power supply, two light-pulse generators, testing fiber, detector and oscillograph connect successively
Connect.
In a kind of preferably embodiment, the wavelength of described two light-pulse generators is unequal, and by optical coupled
Device multiplex.
In a kind of preferably embodiment, described light-pulse generator is the Distributed Feedback Laser of different wave length.
In a kind of preferably embodiment, pass through optical fiber phase between described light-pulse generator, testing fiber and detector
Connection.
In a kind of preferably embodiment, described detector is photodetector.
Method in above-mentioned technical background introduction can measure the dispersion curve of different optical fiber, but actually and need not
Know that DCM compensate for how many dispersion measures, but only know that the module can compensate the color caused by how many kilometers of single-mode fibers
Dissipate.Therefore the utility model is passed through so that requirement of the chromatic dispersion measurement to detection means greatly reduces, while can meet reality again
The demand of border application.
Therefore, we have built an easy scheme, the program is based on impulse time delay method, but easier, as a result
It is more directly perceived, it is intended to test the occurrence of the chromatic dispersion compensation quantity of DCM modules.
Test system includes two not by two light-pulse generators, detector, oscillograph and testing fiber composition, light-pulse generator
The light source of co-wavelength, use optical coupler multiplex.After the soft exchange testing fiber after multiplex, using routine detector and
Oscillograph is detected, shown and measured.Because the dispersion measure of different wave length is different, so the delay inequality of two pulse signals
Can be different, two impulse waveforms can be then observed on oscillograph, the time difference of two peak values of measurement is exactly two differences
The relative difference of caused group delay of the light of wavelength in this section of testing fiber, further according to two in dispersion curve corresponding ripples
The difference of long point caused delay volume in the optical fiber of unit length, to calculate the dispersion length of the module for compensating.
Wherein；
Power supply：For the suitable voltage drive source of light-pulse generator；
Light-pulse generator：Can produce two wavelength, with pulse signal driving light pulse (wavelength is respectively λ 1 and λ 2,
And λ 1<λ2)；
Photodetector：Two pulsed optical signals after DCM are detected, and are converted into corresponding electric signal；
Oscillograph：Show the waveform of two pulse signals and measure their relative time delay, be designated as Δ T.
According to transmission abbe number curve D (λ), unit ps/km.nm of the light in G.652 optical fiber, then the dispersion compensation
The actual uncompensation distance of module is (unit km)：
The measuring system of the fibre-optical dispersion in the utility model is employed, user is without buying expensive traditional chromatic dispersion test
Instrument simultaneously tests out the dispersion curve of optical fiber by the device, method of complexity, is set merely with general pulse light source and oscillograph etc.
Standby can builds to obtain the platform of chromatic dispersion compensation quantity by simple link, and across the methods of testing dispersion curve, passes through
Corresponding software calculation formula can measure the dispersion compensation distance of dispersion compensation module, be with a wide range of applications.
In this description, the utility model is described with reference to its specific embodiment.But it is clear that still can be with
Various modification can be adapted and conversion is without departing from spirit and scope of the present utility model.Therefore, specification and drawings are considered as
It is illustrative and not restrictive.
Claims (4)
- A kind of 1. measuring system of fibre-optical dispersion, it is characterised in that described measuring system include power supply, two light-pulse generators, Testing fiber, detector and oscillograph, described power supply, two light-pulse generators, testing fiber, detector and oscillograph connect successively Connect；The wavelength of two described light-pulse generators is unequal, and passes through optical coupling device multiplex.
- 2. the measuring system of fibre-optical dispersion according to claim 1, it is characterised in that described light-pulse generator is different ripples Long Distributed Feedback Laser.
- 3. the measuring system of fibre-optical dispersion according to claim 1, it is characterised in that described light-pulse generator, treat light-metering It is connected between fine and detector by optical fiber.
- 4. the measuring system of fibre-optical dispersion according to claim 1, it is characterised in that described detector is photodetection Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720555662.4U CN206922758U (en) | 2017-05-18 | 2017-05-18 | The measuring system of fibre-optical dispersion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720555662.4U CN206922758U (en) | 2017-05-18 | 2017-05-18 | The measuring system of fibre-optical dispersion |
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| CN206922758U true CN206922758U (en) | 2018-01-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116915321A (en) * | 2023-09-12 | 2023-10-20 | 威海威信光纤科技有限公司 | Rapid test method and system for optical fiber bus |
-
2017
- 2017-05-18 CN CN201720555662.4U patent/CN206922758U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116915321A (en) * | 2023-09-12 | 2023-10-20 | 威海威信光纤科技有限公司 | Rapid test method and system for optical fiber bus |
| CN116915321B (en) * | 2023-09-12 | 2023-12-01 | 威海威信光纤科技有限公司 | Rapid test method and system for optical fiber bus |
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