CN105577299B - A kind of bandwidth for multimode optical fibers measuring device and method - Google Patents
A kind of bandwidth for multimode optical fibers measuring device and method Download PDFInfo
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- CN105577299B CN105577299B CN201510980919.6A CN201510980919A CN105577299B CN 105577299 B CN105577299 B CN 105577299B CN 201510980919 A CN201510980919 A CN 201510980919A CN 105577299 B CN105577299 B CN 105577299B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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Abstract
The present invention proposes a kind of multimode fibre broadband measuring device, including：Source, optical sender, light injected system, tested multimode fibre, annular flux test system, photoreceiver, spectrum analyzer, frequency meter, computer are swept in synthesis.The present invention proposes whether meet full injection condition using annular flux test system evaluation light injection state, the measurement reproducibility of ensuring equipment, it analyzes and describes the optimization to bandwidth for multimode optical fibers parameter measurement repeatability and improve the uncertainty of bandwidth for multimode optical fibers measurement result, and provide the Gaussian lineshape fitting formula of bandwidth for multimode optical fibers parameter.
Description
Technical field
The present invention relates to technical field of measurement and test, more particularly to it is more to further relate to one kind for a kind of bandwidth for multimode optical fibers measuring device
Mode fiber wide-band width measurement method.
Background technology
Optical fiber can be regarded as a low-pass filter, when high fdrequency component by when will be attenuated.It is one very narrow
Light pulse includes many high fdrequency components, and after one section of multimode fibre, light pulse can be broadened for this very narrow light pulse, so that
Influence the identification of neighbouring code.Rate is higher, and intersymbol interference is more serious, to limit transmission code speed.
The bandwidth parameter of multimode fibre be as unit of MHzkm, refer to one section of optical fiber can by maximum modulating frequency
The modulating frequency of pulse and the product of fiber lengths.Since bandwidth limits the most bloom that multimode optical fiber systems channel can transmit
Pulse rate, in high speed, big information capacity optical network, influence of the bandwidth of an optical fiber for transmission range be can not ignore, at this moment
Multimode fibre can only transmit hundreds of meters of distance, therefore the accurate bandwidth parameter for measuring multimode fibre is extremely important, this is also more
The reason of mode fiber must survey bandwidth parameter when dispatching from the factory.
There are two ways to bandwidth measurement：Time domain method and frequency domain method.International Telecommunication Union (ITU) recommendation is measured with frequency domain method
The bandwidth parameter of multimode fibre.
GB/T 15972.41-2008《The 41st part of Fiber Optic Test method specification：The measurement of transmission characteristic and optical characteristics
Method and test procedure --- bandwidth》The description of bandwidth for multimode optical fibers is measured as shown in Figure 1, including to frequency domain method：
Ancillary equipment
Suitable ancillary equipment should be used, such as：
A) spectrum analyzer or Network Analyzer；
B) sinusoidal wave source.
Program
1. the centering of sample end face
By optic fibre input end and injection light axis of cone line centering, and fiber-optic output is aligned with detector surface, makes detection
Device can receive whole emergent lights of subject optical fiber.
2. data acquisition and processing (DAP)
Firing test device records the output optical signal P of subject optical fiber respectively2The output optical signal of (ω) and reference optical fiber
P1(ω)。
3. reference optical fiber
Can use intercept method by tested optical fiber away from after being cut at injection end about 2m as with reference to optical fiber, it is also possible to it is pre-recorded simultaneously
The data of the reference optical fiber of storage.If the photoelectricity part of light source or receiver, which has, should repeat storage reference data when change.
It calculates
A) according to record result P1(ω) and P2(ω), is pressedDefinition calculate frequency response G (ω)；
B) width-frequency characteristic curve is drawn, and Gaussian function fitting is carried out to curve, is not advised with eliminating baseband response curve
The influence that then bandwidth measurement result is brought.- 3dB (luminous power) points are subject bandwidth of an optical fiber on curve.
GB/T 15972.41-2008《The 41st part of Fiber Optic Test method specification：The measurement of transmission characteristic and optical characteristics
Method and test procedure --- bandwidth》The measurement method for only loosely describing bandwidth for multimode optical fibers parameter, only enumerates more
The simple measuring process of mode fiber bandwidth parameter, there is no the uncertainties etc. from optimization measurement reproducibility, improvement measurement result
Aspect is analyzed and is described, and the Gaussian lineshape fitting formula of bandwidth for multimode optical fibers is not provided yet.
Invention content
The purpose of the present invention is to propose to a kind of bandwidth for multimode optical fibers measuring device and methods, are carrying out bandwidth for multimode optical fibers survey
When amount, proper use of spectrum analyzer, optimization measurement parameter setting, so as to improve the measurement reproducibility of multi-mode ribbons width values.
The base band frequency response of multimode fibre is in Gaussian, The present invention gives the Gaussian lineshape fitting formula of bandwidth for multimode optical fibers parameter, into
One step improves the measurement reproducibility and uncertainty of measurement of multi-mode ribbons width values.
The technical proposal of the invention is realized in this way：
A kind of multimode fibre broadband measuring device, including：Source, optical sender, light injected system, tested multimode light are swept in synthesis
Fine, annular flux test system, photoreceiver, spectrum analyzer, frequency meter, computer；
The sine wave signal of setpoint frequency range is launched in the synthesis source of sweeping, which modulates optical sender, modulation light
After light injected system, it is incident on tested multimode fibre, after optical fiber transmits, system monitoring is tested by annular flux and is adjusted
Light injected system, then modulation signal is demodulated by photoreceiver, which is measured by spectrum analyzer, is recorded with dB values defeated
Light extraction frequency-domain function P2(ω), and be stored in spectrum analyzer memory B；Then optical fiber is cut, input is measured at cutting
Light frequency-domain function P1(ω), and be stored in spectrum analyzer memory A；The dB values of memory A, B subtract each other to obtain optical fiber base band
The amplitude-versus-frequency curve indicated with dB, the curve data substitute into mathematical model, and least square method is used in combination to calculate -3dB points correspondence
Frequency values, the length which is multiplied by tested multimode fibre is exactly the bandwidth value of tested multimode fibre.
Optionally, the length for being tested multimode fibre is measured by multimode optical time domain reflectometer.
Optionally, the frequency meter is used to calibrate the clock signal of spectrum analyzer.
Optionally, the smooth injected system includes mode scrambler, mode filter and cladding mode stripper, and wherein mode scrambler is using strong
Strong geometry perturbation motion method accelerates each pattern to be rapidly reached steady-state distribution, mode filter and cladding mode stripper for filtering out high-order mode
With the optical mode in covering.
Optionally, the annular flux test system is for evaluating whether light injection state meets full injection condition.
Based on above-mentioned apparatus, the invention also provides a kind of multimode fibre wide-band width measurement methods, based on Gaussian function
Founding mathematical models draw amplitude-versus-frequency curve, and carry out Gaussian function fitting to curve, eliminate and are tested multimode fibre base band sound
The influence for answering curve irregularly to be brought to bandwidth measurement result, the corresponding frequency of -3dB points is tested multimode fibre on curve
Bandwidth；Bandwidth for multimode optical fibers experiment curv data are brought into Gauss model, to obtain bandwidth measurement.
Optionally, the bandwidth of multimode fibre is determined by the least square of Gaussian lineshape, is established one and is with Gaussian lineshape
The mathematical model on basis, there are two parameters in the mathematical model：Bandwidth and peak power, can by Gauss mathematical formulae (1) formula
Know, the two parameters are used to generate the Gaussian power Spectral structure relative to frequency f：
In formula：The bandwidth of bandwidth --- multimode fibre；
Pkamp (0Hz) --- when frequency is zero hertz, the peak power in Gaussian lineshape；
Using least square method, gone out in (1) formula by each data point reverse on bandwidth for multimode optical fibers experiment curv
Two variables of bandwidth and pkamp (0Hz), to obtain bandwidth value：
In formula：N --- sampling number；
xi--- it is each using the corresponding frequency values of point；
yi--- it is each using the corresponding range value of point.
Optionally, it is carried out curve fitting to its frequency response calibration data using broadband optical receiver, obtains required Frequency point
Responsiveness eliminates influence of the photoreceiver frequency response to bandwidth measurement result.
Optionally, using spectrum analyzer for measuring, analyzing frequency-region signal.
Optionally, before bandwidth for multimode optical fibers parameter measurement, the calibration of power and frequency calibration are carried out to spectrum analyzer.
The beneficial effects of the invention are as follows：
The present invention proposes whether meet full injection condition, ensuring equipment using annular flux test system evaluation light injection state
Measurement reproducibility, analyze and describe the optimization to bandwidth for multimode optical fibers parameter measurement repeatability and improve multi-mode ribbons
The uncertainty of wide measurement result, and provide the Gaussian lineshape fitting formula of bandwidth for multimode optical fibers parameter.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is mode baseband response test device (frequency response) structure chart in the prior art；
Fig. 2 is the bandwidth for multimode optical fibers measuring device structure chart of the present invention；
Fig. 3 is that bandwidth for multimode optical fibers measures sampling curve and Gauss curve fitting curve analogous diagram.
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 embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
Bandwidth limits the highest light pulse rate that multimode optical fiber systems channel can transmit, when being multimode fibre manufacture
Parameter must be surveyed.
GB/T 15972.41-2008《The 41st part of Fiber Optic Test method specification：The measurement of transmission characteristic and optical characteristics
Method and test procedure --- bandwidth》The measurement method for only loosely describing bandwidth for multimode optical fibers, only lists fibre ribbon
The simple measuring process of wide parameter, there is no carried out from the uncertainty etc. for optimizing measurement reproducibility, improvement measurement result
Analysis and description, do not provide the Gaussian lineshape fitting formula of bandwidth for multimode optical fibers yet.
The present invention measures the bandwidth parameter of multimode fibre using frequency domain method, analyzes and describe the optimization to measurement reproducibility
And improve the uncertainty of measurement result, and provide the Gaussian lineshape fitting formula of bandwidth for multimode optical fibers.
The present invention is described in detail with reference to the accompanying drawings of the specification.
In multimode fibre, dispersion causes pulse expansion.There are two main classes for the dispersion of multimode fibre：Chromatic dispersion (by
The transmission rate difference of different wavelength in a fiber causes in light source) and modal dispersion (by optical fiber, there are multiple patterns to draw
Rise), the dispersion of optical fiber determines bandwidth of an optical fiber.In the multimode fiber transmission system using laser as light source, banding
Width is the main determining factor of bandwidth for multimode optical fibers.The present invention determines multimode by measuring the mode baseband response of multimode fibre
Bandwidth of an optical fiber.
The baseband response of practical multimode fibre is in Gaussian lineshape.On the amplitude frequency curve of baseband frequency response, 1 amplitude point
Corresponding frequency is light cutoff frequency fc, -3dB the light belts which is known as multimode fibre are wide (or -6dB electricity bandwidth), which multiplies
It is the bandwidth of tested multimode fibre with the length of tested optical fiber.The unit of bandwidth for multimode optical fibers parameter is MHzkm.
As shown in Fig. 2, the measuring device of the present invention includes mainly：Synthesis is swept source, optical sender, light injected system, is tested
Multimode fibre, annular flux test system, photoreceiver, spectrum analyzer, frequency meter, computer etc..
The sine wave signal of setpoint frequency range is launched in the synthesis source of sweeping, which modulates optical sender, modulation light
After light injected system, it is incident on tested multimode fibre, after optical fiber transmits, system monitoring is tested by annular flux and is adjusted
Light injected system is until meet full injection condition, then demodulate modulation signal by photoreceiver, the electric signal is by spectrum analysis
Instrument measures, with dB values record output light frequency-domain function P2(ω), and be stored in spectrum analyzer B memories.Then in distance
Optical fiber is cut at about 2 meters of injection end, and input light frequency-domain function P is measured at cutting1(ω), and be stored in spectrum analyzer A and deposit
In reservoir.The dB values of memory A, B subtract each other to obtain measurement result, i.e., the amplitude-versus-frequency curve that optical fiber base band is indicated with dB.The song
Line number is used in combination least square method accurately to calculate the corresponding frequency values of -3dB points, the frequency values according to the mathematical model established is substituted into
The length for being multiplied by tested multimode fibre is exactly the bandwidth value of tested multimode fibre.The length of tested multimode fibre is by multimode optical time domain
Reflectometer (OTDR) is measured；Frequency meter is used to calibrate the clock signal of spectrum analyzer.
Light injected system in measuring device of the present invention includes mode scrambler, mode filter and cladding mode stripper, wherein disturbing mould
Device uses strong geometry perturbation motion method, and each pattern is accelerated to be rapidly reached steady-state distribution, mode filter and cladding mode stripper for filtering
Except the optical mode in high-order mode and covering.
Annular flux test system in measuring device injects whether state meets full injection condition for evaluating light, for
The repeatability of device plays guaranteeing role.
When multimode fibre is by random perturbation, emergence pattern is coupled between each communication mode, makes each communication mode
Superficial velocity tends to be identical, and light pulse distortion caused by Mode Coupling is changed.It is sufficient in Mode Coupling, light arteries and veins
It is punched in propagate in multimode fibre and has obtained stable state propagation, in this condition, the broadening of light pulse and the square root of propagation distance
It is directly proportional.Since the quality of current optical fiber is preferable, the degree of the Random Coupling in optical fiber between pattern is smaller, so will be more
The transmission range reached in mode fiber needed for stable state propagation is very long, therefore generally takes measurement light when measuring the bandwidth of multimode fibre
Fine length is 2.2km or so, and being generally acknowledged that between multimode fibre unit length bandwidth and distance in such transmission range is
Linear dependence.
The measurement of bandwidth for multimode optical fibers parameter to be repeated, it is effective as a result, injection condition is particularly significant.This be because
For multimode transmissions when, different pattern group velocitys are different, if mode power does not reach stable state or balanced distribution, encourage item
The variation of part very little can all make the power of reception be distributed generation large change, and the result that base band measures has very big difference.Using
Full injection mode reaches the steady-state distribution for receiving power.Full injected system is used to measure full injection bandwidth, at this moment injection light cone angle
More than the maximum theoretical numerical aperture of tested multimode fibre, and launch spot diameter and tested multimode fibre core diameter phase
When.Tested multimode fibre should be made without micro-bend, the Energy distribution substantially constant of full injected system output end, and with the coupling nothing of light source
It closes (showing all guided modes by normal excitation).
In measurement process, in order to monitor mode injection condition in real time, high performance annular flux tester is purchased, with
Ensure that the light injection condition generated meets the requirements, improves systematic survey repeatability.
The method of traditional processing bandwidth for multimode optical fibers parameter measurement data is by measuring on amplitude frequency curve than maximum frequency
The Frequency point corresponding to small 3dB is rung, bandwidth for multimode optical fibers measured value is obtained.The repetition of the bandwidth measurement obtained in this way
Property and uncertainty are all poor, this is because two aspect reasons：(1) this method is by determining the frequency corresponding to certain point
Bandwidth value is obtained, therefore the various noises in measurement process can be such that the repeatability of bandwidth measurement substantially reduces；(2) due to frequency
The influence of spectrum analysis instrument local oscillator so that the initial frequency of measurement can not possibly be too low, and theoretically the power corresponding to zero hertz is
Maximum power, bandwidth measurement actual in this way also need to add initial frequency, and different initial frequencies can make bandwidth measurement
Uncertainty greatly increase, especially when measuring small bandwidth, it is this influence it is especially pronounced.
The base band frequency response of multimode fibre is in Gaussian, and measuring device of the invention and method are established based on Gaussian function
Mathematical model draws amplitude-versus-frequency curve, and carries out Gaussian function fitting to curve, and multimode fibre baseband response is tested to eliminate
The influence that curve irregularly brings bandwidth measurement result, the corresponding frequency of -3dB points is the band of tested multimode fibre on curve
It is wide.Bandwidth for multimode optical fibers experiment curv data are brought into Gauss model, to obtain accurate bandwidth measurement.With the present invention's
The repeatability and uncertainty for the bandwidth value that measuring device and method obtain are all relatively good, and there are four aspect advantages：
(1) all data points on bandwidth measurement curve are all used to calculate obtained bandwidth value, so calculating knot
The repeatability and uncertainty of fruit are all relatively good；
(2) it no longer needs that very low initial frequency is arranged in order to show power maximum point and -3dB points；
(3) influence of spectrum analyzer local oscillator is eliminated, can be measured by the way that higher initial frequency is arranged, to
Weaken influence of the spectrum analyzer local oscillator to bandwidth measurement result；And in the case where being measured using conventional method, it can only
Reduce spectrum analyzer local oscillator by the way that lower initial frequency, smaller resolution bandwidth and longer sweep time is arranged
It influences；
(4) noise of experiment curv is averaged, and individual measurement points on frequency response curve have seemed less important and (have been directed to
Conventional method is by for determining 3dB power points smaller than maximum power).
The bandwidth of multimode fibre can be determined that establish one thus is with Gaussian lineshape by the least square of Gaussian lineshape
The mathematical model on basis.There are two parameters in the model：Bandwidth and peak power (power at zero hertz).By Gaussage
Formula (1) formula is learned it is found that the two parameters are used to generate the Gaussian power Spectral structure relative to frequency f.
In formula：The bandwidth of bandwidth --- multimode fibre；
Pkamp (0Hz) --- when frequency is zero hertz, the peak power in Gaussian lineshape.
Using least square method, by each data point (frequency, power to) reverse on bandwidth for multimode optical fibers experiment curv
Go out two variables of bandwidth and pkamp (0Hz) in (1) formula, to obtain accurate bandwidth value：
In formula：N --- sampling number；
xi--- it is each using the corresponding frequency values of point；
yi--- it is each using the corresponding range value of point.
Fig. 3 is that bandwidth for multimode optical fibers measures sampling curve and Gauss curve fitting curve analogous diagram, and solid line represents sampling song in figure
Line, dotted line represent Gauss curve fitting curve.
In addition, using highly sensitive broadband optical receiver, and carry out curve fitting to its frequency response calibration data, it obtains required
The responsiveness of Frequency point, to eliminate influence of the photoreceiver frequency response to bandwidth measurement result.Using high-performance spectrum analyzer
For measuring, analyzing frequency-region signal.Frequency response in order to reduce spectrum analyzer influences, and reduces the measurement of spectrum analyzer introducing not
Degree of certainty carries out the calibration of power and frequency calibration before bandwidth for multimode optical fibers parameter measurement to the spectrum analyzer in device,
Also the uncertainty of measurement of system can be substantially improved.
Traditional -3dB point bandwidth for multimode optical fibers measurement methods are by determining the power on base band frequency response curve relatively most
Big value point determines bandwidth value with -3dB points.This by putting the method to determine bandwidth value individually, measurement reproducibility compared with
Difference.Bandwidth measurement result can be made seriously to be deviateed by the influence of spectrum analyzer local oscillator in addition, lower initial frequency is arranged
The actual value of bandwidth.
The present invention measures frequency response curve Gaussian lineshape fitting technique using bandwidth for multimode optical fibers and measures bandwidth for multimode optical fibers ginseng
It counts, all data points on experiment curv are all used to calculate obtained bandwidth value, it is no longer necessary in order to show power
Maximum point and -3dB points and very low initial frequency is set, this method obtains the repeatability of bandwidth value and uncertainty all compares
It is good.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (10)
1. a kind of multimode fibre broadband measuring device, which is characterized in that including：Synthesis sweep source, optical sender, light injected system,
Tested multimode fibre, annular flux test system, photoreceiver, spectrum analyzer, frequency meter, computer；
The sine wave signal of setpoint frequency range is launched in the synthesis source of sweeping, and swept-frequency signal modulates optical sender, and modulation light passes through light
After injected system, it is incident on tested multimode fibre, after optical fiber transmits, system monitoring is tested by annular flux and adjusts light injection
System, then modulation signal is demodulated by photoreceiver, which is measured by spectrum analyzer, and output optical frequency is recorded with dB values
Domain function P2(ω), and be stored in spectrum analyzer memory B；Then optical fiber is cut, input light frequency domain is measured at cutting
Function P1(ω), and be stored in spectrum analyzer memory A；The dB values of memory A, B subtract each other to obtain optical fiber base band with dB tables
The amplitude-versus-frequency curve shown, the curve data substitute into mathematical model, least square method are used in combination to calculate the corresponding frequency of -3dB points
Value, the length which is multiplied by tested multimode fibre are exactly the bandwidth value of tested multimode fibre.
2. multimode fibre broadband measuring device as described in claim 1, which is characterized in that the length of tested multimode fibre is by more
Mould optical time domain reflectometer is measured.
3. multimode fibre broadband measuring device as described in claim 1, which is characterized in that the frequency meter is for calibrating frequency spectrum
The clock signal of analyzer.
4. multimode fibre broadband measuring device as described in claim 1, which is characterized in that the smooth injected system includes disturbing mould
Device, mode filter and cladding mode stripper, wherein mode scrambler use strong geometry perturbation motion method, and each pattern is accelerated to be rapidly reached stable state
Distribution, mode filter and cladding mode stripper are used to filter out the optical mode in high-order mode and covering.
5. multimode fibre broadband measuring device as described in claim 1, which is characterized in that the annular flux test system is used
Whether meet full injection condition in evaluation light injection state.
6. the multimode fibre wide-band width measurement method based on any one of claim 1 to 5 described device, which is characterized in that with Gauss
Function is basic founding mathematical models, draws amplitude-versus-frequency curve, and carry out Gaussian function fitting to curve, eliminates and be tested multimode
The influence that optical fiber baseband response curve irregularly brings bandwidth measurement result, the corresponding frequency of -3dB points is tested on curve
The bandwidth of multimode fibre；Bandwidth for multimode optical fibers experiment curv data are brought into Gauss model, to obtain bandwidth measurement.
7. multimode fibre wide-band width measurement method as claimed in claim 6, which is characterized in that the bandwidth of multimode fibre is by gaussian line
The least square of type determines, establishes a mathematical model based on Gaussian lineshape, and there are two ginsengs in the mathematical model
Number：Bandwidth and peak power, by Gauss mathematical formulae (1) formula it is found that the two parameters are used to generate the Gauss relative to frequency f
Power Spectrum Distribution：
In formula：The bandwidth of bandwidth --- multimode fibre；
Pkamp (0Hz) --- when frequency is zero hertz, the peak power in Gaussian lineshape；
Using least square method, gone out in (1) formula by each data point reverse on bandwidth for multimode optical fibers experiment curv
Two variables of bandwidth and pkamp (0Hz), to obtain bandwidth value：
In formula：N --- sampling number；
xi--- it is each using the corresponding frequency values of point；
yi--- it is each using the corresponding range value of point.
8. multimode fibre wide-band width measurement method as claimed in claim 7, which is characterized in that using broadband optical receiver to its frequency
It rings calibration data to carry out curve fitting, obtains the responsiveness of required Frequency point, eliminate photoreceiver frequency response to bandwidth measurement result
Influence.
9. multimode fibre wide-band width measurement method as claimed in claim 7, which is characterized in that using spectrum analyzer for surveying
Amount, analysis frequency-region signal.
10. multimode fibre wide-band width measurement method as claimed in claim 7, which is characterized in that surveyed in bandwidth for multimode optical fibers parameter
Before amount, the calibration of power and frequency calibration are carried out to spectrum analyzer.
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| CN112511220B (en) * | 2019-09-16 | 2022-02-22 | 华为技术有限公司 | Measuring method for rapidly and effectively judging multimode fiber bandwidth |
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|---|---|---|---|---|
| CN102804647A (en) * | 2009-06-15 | 2012-11-28 | 泛达公司 | Design method and metric for selecting and disigning multimode fiber for improved performance |
| CN102854563A (en) * | 2011-07-01 | 2013-01-02 | 德拉克通信科技公司 | Multimode optical fiber |
| CN103278271A (en) * | 2013-04-27 | 2013-09-04 | 天津大学 | Distributed optical fiber monitoring system and monitoring method thereof |
| CN104020520A (en) * | 2008-09-17 | 2014-09-03 | Ofs菲特尔有限责任公司 | Bandwidth-maintaining multimode optical fibers |
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| US8489369B2 (en) * | 2009-08-28 | 2013-07-16 | Panduit Corp. | Methods for calculating multimode fiber system bandwidth and manufacturing improved multimode fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020520A (en) * | 2008-09-17 | 2014-09-03 | Ofs菲特尔有限责任公司 | Bandwidth-maintaining multimode optical fibers |
| CN102804647A (en) * | 2009-06-15 | 2012-11-28 | 泛达公司 | Design method and metric for selecting and disigning multimode fiber for improved performance |
| CN102854563A (en) * | 2011-07-01 | 2013-01-02 | 德拉克通信科技公司 | Multimode optical fiber |
| CN103278271A (en) * | 2013-04-27 | 2013-09-04 | 天津大学 | Distributed optical fiber monitoring system and monitoring method thereof |
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