CN106253973B - A kind of long range less fundamental mode optical fibre characteristic measurement method and device - Google Patents
A kind of long range less fundamental mode optical fibre characteristic measurement method and device Download PDFInfo
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- CN106253973B CN106253973B CN201610623443.5A CN201610623443A CN106253973B CN 106253973 B CN106253973 B CN 106253973B CN 201610623443 A CN201610623443 A CN 201610623443A CN 106253973 B CN106253973 B CN 106253973B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
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Abstract
The present invention relates to a kind of long range less fundamental mode optical fibre characteristic measurement method and devices, and this approach includes the following steps：The optical carrier of frequency comb light source transmitting generates double-side band output signal light after optical modulation system；Double-side band output signal light inspires the higher order mode of less fundamental mode optical fibre, and emergence pattern interference generates the output signal light for carrying higher order mode information in transmission process after Butt-coupling system；The output signal light for carrying higher order mode information produces electric signal interference information figure after optical filter and photodetector；Simple data is carried out to electric signal interference information figure to handle to obtain the higher order mode characteristic information of less fundamental mode optical fibre.The present invention is with measuring device is simple, easy to operate, measuring speed is fast；The less fundamental mode optical fibre characteristic of long range can be measured.It measures obtained electric signal interference information figure and calculates the characteristic information that can be obtained less fundamental mode optical fibre by simple data.
Description
Technical field
The invention belongs to optic fibre characteristic field of measuring technique, more particularly to a kind of long range less fundamental mode optical fibre feature measurement side
Method and device.
Background technology
Optical fiber telecommunications system be using light as carrier wave, using the glass-pulling of very high purity at superfine optical fiber as pass
Defeated medium is used up by light-to-current inversion to transmit the communication system of information.It is at full speed with Internet business and communication industry
Development, the information-based development to world's productivity and human society bring great promotion.Fiber optic communication is as informationization
One of major technique pillar will become 21 century most important strategic industry.But rapidly with various data services
Increase, is especially the big data epoch of representative, various information service streams in Next Generation Internet, Internet of Things, smart city etc.
Amount demand promotes optical fiber telecommunications system that must rapidly update transmission rate and capacity in time.Currently, using advanced modulation technology
It is the key technology that optical fiber telecommunications system is studied extensively with multidimensional multiplexing technology.Wherein, most widely used one of multiplexing technology
It is exactly space division multiplexing technology (SDM).
Realize that one of the major technique of SDM is exactly to carry out data-reusing transmission with less fundamental mode optical fibre (FMF).The technology can be abundant
The characteristic that can be transmitted into row information as independent channel using FMF different orthogonals pattern, with this lifting system transmission speed
Transmission and capacity.Since FMF is the important transmission medium of mode multiplexing technology, characteristic includes the ginsengs such as pattern group delay, dispersion
It is several to have important influence to next-generation fibre-optic transmission system (FOTS), thus the feature measurement of less fundamental mode optical fibre is also just become increasingly to weigh
It wants.
For this purpose, being badly in need of finding a kind of quick, simple, accurate less fundamental mode optical fibre measuring technique, for next-generation mode multiplexing
Optical fiber telecommunications system especially long range less fundamental mode optical fibre communication system provides technical support.
Invention content
In order to solve the above technical problems, the present inventor proposes that a kind of long range less fundamental mode optical fibre characteristic is surveyed by studying for a long period of time
Measure method and device, long range less fundamental mode optical fibre characteristic measurement method and device, the present invention can fast, accurately measure it is long away from
From less fundamental mode optical fibre characteristic, and experimental provision is simple, easy to operate.
According to the present invention in a first aspect, provide a kind of long range less fundamental mode optical fibre characteristic measurement method, belong to based on electricity
The long range less fundamental mode optical fibre characteristic measurement method of signal interference technology comprising following steps：
S1. the optical signal of frequency comb light source transmitting multi-wavelength (frequency) generates double-side band output after optical modulation system
Signal light；
S2. double-side band output signal light passes through Butt-coupling system, passes through Regulate signal light entering in less fundamental mode optical fibre end face
Position is penetrated to excite high-order fiber mode, and then emergence pattern interference generation carries higher order mode information in less fundamental mode optical fibre
Output signal light；
S3. the output signal light for carrying higher order mode information generates electric signal after optical filter and photodetector
Interference information figure；
S4. simple data is carried out to electric signal interference information figure to handle to obtain the wave band model covered in the frequency comb light source
The higher order mode characteristic information of less fundamental mode optical fibre in enclosing.
Wherein, step S1 is specially：Multi-wavelength (frequency) optical carrier of frequency comb light source transmitting passes through Polarization Control
Device adjusts optical signal polarization state, subsequently into intensity modulator, in vector network analyzer RF driving signal and direct current biasing
Under the action of voltage, double sideband modulation is carried out to light carrier, has generated double-side band output signal light.The signal light passes through a light
Fine coupler, one end output access spectrometer, to monitor the quality of double-side band output signal light, the other end exports then conduct
The incoming signal light of Butt-coupling system.
Wherein, step S2 is specially：The incoming signal light of Butt-coupling system is focused by collimation lens to be directed at coupling
The object lens of platform, while platform is coupled to adjust incident signal beam with being clipped in by the three-dimensional regulation system of optical coupled platform
On less fundamental mode optical fibre end face between relative position, the higher order mode in less fundamental mode optical fibre is excited with this.The high-order fiber mode of generation
It is transmitted in less fundamental mode optical fibre, under the action of mode-interference, output carries the interference of different higher order mode characteristic informations
Signal light simultaneously enters optical filter and photodetector.
Wherein, step S3 is specially：The interference signal light for carrying higher order mode information is selected by optical filter
It filters and after photodetector, electric signal interference information figure between the pattern of different wave length channel will be obtained, this hum pattern connects
It can be shown after entering vector network analyzer.
Wherein, step S4 is specially：Electric signal interference information diagram data is extracted from vector network analyzer, is passed through
Fast Fourier Transform (FFT) (FFT) obtains the peak point corresponding to time domain difference high-order fiber mode, the when meta position of these peak points
It sets and corresponds to delay inequality of the different higher order modes relative to the less fundamental mode optical fibre basic mode.By calculate different higher order modes relative to
The delay inequality of basic mode can be obtained different higher order modes relative to ginsengs such as the difference modes group delay (DMGD) of basic mode and dispersions
Number；By the carry out simple data analysis for the different wave length that same procedure covers frequency comb light source, you can obtain required wave band
The characteristics such as the difference modes group delay DMGD and abbe number of the less fundamental mode optical fibre in range.
Second aspect according to the present invention provides a kind of long range less fundamental mode optical fibre characteristic measurement method for realizing the above method
Device belongs to a kind of Butt-coupling device comprising：Polarization Controller, intensity modulator, collimating mirror, three-dimensional adjustable light
Platform and less fundamental mode optical fibre are coupled, the Polarization Controller is used for adjusting the polarization state of optical signal；The intensity modulator is used for producing
Raw double-side band output signal light；The collimating mirror is used for being focused output signal beam；The three-dimensional adjustable light coupling
Platform is used for adjusting the relative position between input signal light and less fundamental mode optical fibre end face supports transmission to excite in less fundamental mode optical fibre
High-order fiber mode；The less fundamental mode optical fibre is testing fiber.
Further, described device further includes：Frequency comb light source, RF driving signal, DC offset voltage, fiber coupling
Device, spectrometer, optical filter, photodetector and vector network analyzer, the frequency comb are used for generating covering C-band wavelength
The optical carrier of (frequency)；The RF driving signal is generated by vector network analyzer, and the signal frequency is in setting range
It is interior continuously adjustable, it is mainly used for modulate intensity modulator to generate the double-side band output signal light at specific frequency interval；It is described straight
Stream bias voltage is mainly used to control the working condition of intensity modulator, it is made to be operated in no chirped modulation state；The optical fiber
Coupler is used for completing the separation of the coupling and required ratio to input signal light；The spectrometer is used for monitoring double-side band output
The quality of signal light；The optical filter is used for carrying out selection filtering；The signal light that the photodetector is used for input turns
Become electric signal；The vector network analyzer is used for providing the RF driving signal and record less fundamental mode optical fibre of particular frequency range
Frequency response.
Long range less fundamental mode optical fibre characteristic measurement method and device of the present invention are compared to mode multiplexing optical fiber telecommunications system now
In for the widely applied technology for measuring less fundamental mode optical fibre characteristic, have the following advantages that and effect：Measuring device is simple, is easy behaviour
Work, measuring speed are fast；The less fundamental mode optical fibre characteristic of long range can be measured.Obtained electric signal interference pattern is measured by simple number
It can be obtained the characteristic information of less fundamental mode optical fibre according to calculating.
Description of the drawings
Fig. 1 is the structural schematic diagram of long range less fundamental mode optical fibre characteristic measuring device according to the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.Additionally, protection scope of the present invention should not only be limited to following
Specific module or design parameter.
Long range less fundamental mode optical fibre characteristic measurement method and device of the present invention by as be possible to be applied to high speed optical fiber communication
System performance compensation technique has obtained invention and research.
In the present invention, a kind of long range less fundamental mode optical fibre characteristic measurement method includes the following steps：
S1. the optical carrier of frequency comb light source transmitting generates double-side band output signal light after optical modulation system；
S2. double-side band output signal light is coupled into the interference of less fundamental mode optical fibre emergence pattern by Butt-coupling system, generates
Carry the output signal light of higher order mode information；
S3. the output signal light for carrying higher order mode information generates electric signal after optical filter and photodetector
Interference information figure；
S4. simple data is carried out to electric signal interference information figure to handle to obtain the characteristic information of less fundamental mode optical fibre higher order mode.
Above-mentioned S1 the specific steps are：Multi-wavelength (frequency) optical signal of frequency comb light source transmitting is adjusted through Polarization Controller
After the polarization state of optical signal, into intensity modulator, in the RF driving signal and direct current biasing of vector network analyzer output
Under the action of voltage, double sideband modulation is carried out to light carrier, double-side band is generated and exports optical signal.This signal passes through an optical fiber coupling
Clutch, one end output access spectrometer export optical signal to monitor double-side band, and other end output enters as incoming signal light
Butt-coupling system.
The frequency comb light source working is at C-band (1530-1565nm)；
The Polarization Controller is used for adjusting the polarization state of the emitted signal light of lasing light emitter；
The intensity modulator is right under the action of the RF driving signal of vector network analyzer and DC offset voltage
Light carrier has carried out double sideband modulation；
The RF driving signal is mainly used to driving intensity modulator, and frequency sweeping ranges are the work of special setting
Range, such as 10MHz-15GHz, to obtain the frequency response interference pattern in the working range；
The DC offset voltage is mainly used to set the working condition of intensity modulator, even if intensity modulator is operated in
Zero additional phase shift state；
The fiber coupler is asymmetric photo-coupler, and output power ratio is 90: 10, and 90% output end is as incident
Signal light is coupled into less fundamental mode optical fibre, and 10% output end accesses spectrometer to monitoring signals quality；
The spectrometer is used for showing and monitoring double-side band quality of output signals；
Above-mentioned S2 the specific steps are：Incoming signal light focuses the object lens for being directed at optical coupled platform by collimating mirror, leads to
The relative position crossed three-dimensional regulation system adjustment incident signal beam and be clipped between coupling the end face of the less fundamental mode optical fibre on platform, with this
Excite the higher order mode in less fundamental mode optical fibre.Different mode in less fundamental mode optical fibre interferes effect, and generation carries high-order
The output signal light of pattern information simultaneously enters optical filter and photodetector therewith.
The collimating mirror is used for focusing signal beams, the convenient Butt-coupling with less fundamental mode optical fibre carried out later；
The three-dimensional coupling platform is used for controlling the Butt-coupling of input signal beam and less fundamental mode optical fibre, adjusts their phase
To position to inspire higher order mode；
Above-mentioned S3 the specific steps are：The output signal light for carrying higher order mode information is visited by optical filter and photoelectricity
Access vector network analyzer has produced the electric signal interference information figure between different mode after surveying device detection.
The optical filter is used for carrying out selective filter to the optical signal of input；
The photodetector is used for detecting the optical signal of input；
The vector network analyzer is used for receiving the electric signal after photodetector detects, and records and show unicast
Frequency response of long (frequency) channel within the scope of certain frequency；
Above-mentioned S4 the specific steps are：Electric signal interference information diagram data is extracted from vector network analyzer,
Fast Fourier Transform (FFT) (FFT) is carried out in software MATLAB, obtains the peak value corresponding to time domain difference higher order mode, these peak values
Delay positions, that is, delay inequality of the different higher order modes relative to basic mode.Delay inequality by different higher order modes relative to basic mode
Difference modes group delay (DMGD) and abbe number of the different higher order modes relative to basic mode can be calculated；By phase Tongfang
The carry out simple data analysis for the different wave length that method covers frequency comb light source, you can obtain few mould in required wavelength band
The characteristics such as the difference modes group delay DMGD of optical fiber and abbe number.
More specifically, as shown in Figure 1, long range less fundamental mode optical fibre characteristic measurement method includes four steps (part).When
The generation of modulated signal light：Multi-wavelength (frequency) optical signal that frequency comb light source 1 emits adjusts optical signal by Polarization Controller 2
Polarization state, subsequently into intensity modulator 3, the RF driving signal 5 and the direct current biasing electricity that are generated in vector network analyzer
Under the action of pressure 4, double sideband modulation is carried out to optical carrier.Double-side band output signal passes through a fiber coupler 6, one
End output access spectrometer 7, to monitor double-side band quality of output signals, other end output enters collimation as incoming signal light
Mirror 8 is focused.
Second is that Butt-coupling and mode-interference process：Incoming signal light focuses the object of alignment coupling platform 9 by collimating mirror 8
Mirror, by couple platform 9 three-dimensional regulation system adjustment incident signal beam be clipped in 10 end of less fundamental mode optical fibre coupled on platform
Relative position between face, farthest to excite the higher order mode in less fundamental mode optical fibre 10 to be measured.In less fundamental mode optical fibre 10 to be measured
The different mode output signal light of output with higher order mode information after interfering effect enters optical filter 11 and is selected
Selecting property filters, and filters out specific wavelength channel and enters photodetector 12.
Third, signal photoelectricity conversion process：The output signal light for carrying higher order mode information is visited by photodetector 12
The electric signal interference information figure between the different mode within the scope of the generation certain frequency of vector network analyzer 13 is accessed after survey.
Fourth, simple data processing procedure：The electric signal interference information figure number extracted from vector network analyzer 13
According to, Fast Fourier Transform (FFT) (FFT) is carried out in software MATLAB, obtains the peak value corresponding to time domain difference higher order mode, this
Delay positions, that is, delay inequality of the different higher order modes relative to basic mode of a little peak points.By different higher order modes relative to basic mode
Delay inequality difference modes group delay (DMGD) and abbe number of the different higher order modes relative to basic mode can be calculated；
By the carry out simple data analysis for the different wave length that same procedure covers frequency comb light source, you can obtain required wavelength band
The characteristics such as the difference modes group delay DMGD of interior less fundamental mode optical fibre and abbe number.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Those skilled in the art is appreciated that without departing substantially from appended right
It is required that in the case of the spirit and scope of the present invention of definition, various modifications can be made in form and detail.
Claims (6)
1. a kind of long range less fundamental mode optical fibre characteristic measurement method belongs to the long range less fundamental mode optical fibre based on electric signal interference technique
Characteristic measurement method comprising following steps：
S1. the optical signal of frequency comb light source transmitting generates double-side band output signal light after optical modulation system；
S2. double-side band output signal light enters progress mode-interference generation in less fundamental mode optical fibre after Butt-coupling system and carries
The output signal light of higher order mode information；
S3. carrying the output signal light of higher order mode information, that electric signal is produced after optical filter and photodetector is dry
Relate to hum pattern；
S4. simple data is carried out to electric signal interference information figure to handle to obtain in the wavelength band that the frequency comb light source is covered
Less fundamental mode optical fibre higher order mode characteristic information；
Wherein, step S1 is specially：The multi-wavelength or frequency optical signal emitted by frequency comb light source is adjusted by Polarization Controller
Optical signal polarization state, subsequently into optical modulation system, the RF driving signal and direct current generated in vector network analyzer is inclined
Under the action of setting voltage, double sideband modulation is carried out to optical signal, has generated double-side band output signal light；The signal light passes through one
Fiber coupler, one end output access spectrometer, to monitor double-side band quality of output signals, other end output is as incident
Signal light enters Butt-coupling system；The optical modulation system includes intensity modulator, radio-frequency driven and DC offset voltage；
The Butt-coupling system includes collimation lens, object lens and three-dimensional regulation system；
Step S2 is specially：Incoming signal light focuses the object lens for being directed at optical coupled platform by collimating mirror, by optical coupled
It is opposite between the three-dimensional regulation system adjustment incident signal beam of platform and the less fundamental mode optical fibre end face being clipped on optical coupled platform
Position, to excite the higher order mode in less fundamental mode optical fibre, and then emergence pattern interference generation carries high-order in transmission process
The output signal light of pattern information；
Step S3 is specially：The interference signal light for carrying higher order mode information carries out selection filtering by optical filter and passes through
After photodetector, electric signal interference information figure between the pattern of different wave length channel will be obtained, this hum pattern accesses vector network
It can be shown after analyzer；
Step S4 is specially：Electric signal interference information diagram data is extracted from vector network analyzer, in software MATLAB
Middle progress Fast Fourier Transform (FFT) FFT obtains the peak value that different higher order modes correspond to time domain, the delay positions of these peak points
Delay inequality of the i.e. different higher order modes relative to basic mode；Delay inequality by different higher order modes relative to basic mode can calculate
Differential mode group delay DMGD and abbe number to different higher order modes relative to basic mode；By same procedure to frequency comb light source institute
The carry out simple data analysis of the different wave length of covering, you can obtain the difference modes group of the less fundamental mode optical fibre in required wavelength band
Time delay D MGD and abbe number.
2. a kind of long range less fundamental mode optical fibre characteristic measuring device for realizing method as described in claim 1 comprising：Polarization Control
Device, intensity modulator, collimating mirror, three-dimensional adjustable light coupling platform and less fundamental mode optical fibre, the Polarization Controller are used for adjusting light
The polarization state of signal；The intensity modulator is used for generating double sideband modulation signal；The collimating mirror be used for signal beams into
Line focusing；Three-dimensional adjustable light coupling platform be used for adjusting the relative position between input signal light and less fundamental mode optical fibre end face with
Excite the higher order mode in less fundamental mode optical fibre；The less fundamental mode optical fibre, that is, less fundamental mode optical fibre to be measured.
3. long range less fundamental mode optical fibre characteristic measuring device according to claim 2, which is characterized in that further include：Frequency comb
Light source, RF driving signal, DC offset voltage, fiber coupler, spectrometer, optical filter, photodetector and vector net
Network analyzer；The frequency comb light source is used for generating covering C-band wavelength or the optical carrier of frequency.
4. long range less fundamental mode optical fibre characteristic measuring device according to claim 3, which is characterized in that the radio-frequency driven letter
It number is generated by vector network analyzer, which is continuously adjusted in setting range, is mainly used for modulate intensity modulator
To generate the double-side band output signal light at specific frequency interval.
5. according to any long range less fundamental mode optical fibre characteristic measuring device of claim 2-4, which is characterized in that described straight
Stream bias voltage is mainly used to control the working condition of intensity modulator, it is made to be operated in no chirped modulation state；The optical fiber
Coupler is used for completing the separation of the coupling and required ratio to input signal light.
6. according to any long range less fundamental mode optical fibre characteristic measuring device of claim 2-4, which is characterized in that the light
Spectrometer is used for monitoring the quality of double-side band output signal light；The optical filter is used for carrying out selection filtering；The photodetection
Device is used for the signal light of input being changed into electric signal；The vector network analyzer is used for providing the radio frequency of particular frequency range
The frequency response of drive signal and record less fundamental mode optical fibre.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106895959B (en) * | 2017-04-17 | 2019-01-25 | 吉林大学 | A kind of less fundamental mode optical fibre Mode Coupling measuring device based on two-photon lantern and less fundamental mode optical fibre circulator |
| CN107677452B (en) * | 2017-10-24 | 2020-06-02 | 长飞光纤光缆股份有限公司 | Few-mode optical fiber comprehensive tester and testing method |
| CN108736961B (en) * | 2018-06-27 | 2023-11-10 | 辽宁华星天绘科技有限公司 | Optical fiber detection device, system and method based on distributed vector network analyzer |
| CN110401482A (en) * | 2019-07-22 | 2019-11-01 | 杭州电子科技大学 | A kind of device and method carrying out fibre-optical dispersion measurement using wavelength-time map |
| CN113098595B (en) * | 2021-03-12 | 2022-02-15 | 华中科技大学 | Method, system and device for measuring group delay of few-mode optical fiber differential mode |
| CN112702119B (en) * | 2021-03-25 | 2021-06-01 | 南京信息工程大学 | Differential mode group delay compensation method and system based on photoelectric fusion |
| CN113483880A (en) * | 2021-08-17 | 2021-10-08 | 广东电网有限责任公司 | Vibration sensing system based on few-mode optical fiber |
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