CN103414517B - A kind of optical signal rate recognition methods and system - Google Patents
A kind of optical signal rate recognition methods and system Download PDFInfo
- Publication number
- CN103414517B CN103414517B CN201310308540.1A CN201310308540A CN103414517B CN 103414517 B CN103414517 B CN 103414517B CN 201310308540 A CN201310308540 A CN 201310308540A CN 103414517 B CN103414517 B CN 103414517B
- Authority
- CN
- China
- Prior art keywords
- signal
- nptf
- optical signal
- tdc
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention relates to a kind of optical signal rate recognition methods and the system of fiber optic communication field, including: after Tunable Dispersion Compensator TDC optical signal to be identified to input rate applies certain dispersion values, output optical signal injects non-linear power transfer function NPTF generation module after image intensifer amplifies, and NPTF generation module output end signal mean power measured by light power meter；Control and digital signal processing module drives described TDC to work in step-scan mode, and sweep limits and step-length are zoomed in and out to record at equal pace under a series of different zoom ratio in TDC scanning process NPTF output signal mean power with the change curve of dispersion, and it is mated with the dispersion values-average power signal sample curve of the signal that speed is B, obtaining the scaling R that matching degree is the highest, the speed of signal the most to be identified isThe present invention works without any prior information, it is adaptable to various modulation formats and the signal of speed, has simple in construction, the advantage that cost performance is high.
Description
Technical field
The present invention relates to fiber optic communication, All-optical signal and digital signal processing technique field.
Background technology
Along with improving constantly traffic capacity demands, past 20 years, optical fiber telecommunications system was rapidly sent out
Exhibition.Along with the appearance of broadband data services, such as video request program, IPTV, multimedia is believed
Breath service, game on line etc., this needs constantly upgrading existing fiber communication network, to support that these are high
Transfer rate is applied.On the other hand, service supplier be also required to retain some existing low speed voice and
Data, services.Therefore, optical fiber telecommunications system needs the optical signal supporting multiple speed to transmit simultaneously, with
Meet the demand of different user.In this heterogeneous network, network is managed, optimizes, to light
Detection and the reception of signal are the most increasingly complex.Signal rate accurately estimate for network timing synchronization,
The search of Modulation Mode Recognition, signal specific and receiver demodulation all have important meaning.Should in military affairs
Also it is the key issue in electronic communication antagonism and signal interception with the identification of field signal rate.
The method of the rate identification proposed at present mainly has Clock Extraction, filtering sampling, spectrum analysis and divides
Frequency meter number etc..Clock Extraction is that the optical signal to different-format is for conversion into the base band letter of electricity through optical electrical
Number, owing to the speed of signal is different, so their clock is the most different. according to this feature,
They are carried out Clock Extraction to measure signal rate.The advantage using Clock Extraction scheme is that function is complete
Face, effective, the clock extracted can be as a part for following receiver.Make suitable extension,
The optical electrical modular converter of a multi tate can be made.But it is due to Clock Extraction chip, the highest
The Clock Extraction chip price of speed is expensive, and the most this scheme cost is the highest, for the letter of two-forty
Number there is also electronic bottleneck to limit.In addition, to can lock according to clock and judge, and want
Wheel brings judgement, recognition speed and discrimination one by one is not highly desirable.Filtering sampling is by transmission
Optical signal is electricity baseband signal through optical electrical shift conversion, the power spectrum of the baseband signal of different rates
Differ, signal rate can be identified by the power spectrum of filter scan baseband signal.This
The method of kind is easily adjudicated, but high frequency filter is difficult to make and control, and is easily disturbed by outside noise.
Additionally due to the speed of optical signal typically can reach more than 40Gb/s, the bandwidth requirement to Sampling device
The highest, therefore it is difficult to realize.Spectra methods is to flashlight by high-resolution spectrogrph
Clock spectral line or the spectrum width of spectrum measure, to differentiate the speed of signal.This method is to spectrogrph
Resolution requirement is relatively strong, and this type of high resolution spectrometer price is sufficiently expensive, and volume is bigger.In addition
The method is for the speed of some signal (such as quadrature amplitude modulation QAM signal) without clock spectral line
Rate identification difficulty.Frequency division counter is within the regular hour, counts the signal of different rates
Number, the count value of gained is different, thus can identify different signal rates easily.Frequency dividing meter
Number scheme low cost, recognition speed are fast, and the probability of erroneous judgement is the lowest.But, for higher than Gb/s
The enumerator of speed be relatively difficult to realize, need generally signal at a high speed first to be divided into low speed signal
Count the most again, it is achieved get up complex.
Need exploitation a kind of without any prior information, to optical signal modulation form for solving the problems referred to above
Unconfined with speed, it is not necessary to expensive high speed optoelectronic device or accurate spectrum analysis equipment, simple in construction,
The optical signal rate recognition methods that cost performance is high.
Summary of the invention
The technical problem to be solved is to propose a kind of optical signal rate recognition methods and system, should
Method should be unrestricted to format modulation signal and speed without any prior information, it is not necessary to expensive height
Speed photoelectric device or accurate spectrum analysis equipment, have simple in construction, the advantage that cost performance is high.
For solving above-mentioned technical problem, the present invention proposes a kind of optical signal rate recognition methods, and its feature exists
In, relate to Tunable Dispersion Compensator TDC, image intensifer OA, input optical filter, non-linear merit
There is module, light power meter PM and control and Digital Signal Processing in rate transfer function NPTF
Ctr-DSP.Owing to Talbot effect can cause signal pulse peak power to present the cycle with CD change
Property change, square being inversely proportional to of Cycle Length and signal rate.After described NPTF, its peak work
Rate change is exaggerated and is mapped in the mean power change of unused light, thus can pass through described PM
Measure and obtain the peak power change curve CD-Power with dispersion.Owing to Talbot effect is the most synchronized
But the CD-Power curve shape of rate signal is identical can occur telescopic variation in x coordinate direction, stretch
Square being inversely proportional to of contracting ratio and signal rate.The recognition methods that when being embodied as, the present invention proposes includes
Following steps:
Optical signal to be measured initially enters TDC, TDC and works in step-scan mode, executes signal
Adding the CD value of certain intervals in certain limit, its output optical signal is after OA is amplified to certain power
Inject NPTF and module occurs；
Described NPTF occurs module to produce the average power signal under certain C D value, and described PM surveys
There is module output end signal mean power in amount NPTF；
TDC described in described Ctr-DSP module drive works in step-scan mode, and to scanning model
Enclose with step-length that to zoom in and out to record TDC under a series of different zoom ratio at equal pace scanned
In journey, NPTF output signal mean power is with the change curve of dispersion, and with speed is the letter of B by it
Number CD-Power curve sample mate, obtain the scaling R(R > 1 that matching degree is the highest
Representing and amplify, R < 1 represents and reduces), the speed of signal the most to be identified is
The described CD-Power curve sample that CD-Power is surveyed array and corresponding modulating format signal
Originally the algorithm carrying out mating includes cross correlation algorithm, feature recognition algorithms, maximum likelihood algorithm or nerve
Network algorithm.
The present invention also proposes the system of a kind of optical signal modulation format identification method, it is characterised in that bag
Including, Tunable Dispersion Compensator TDC, image intensifer OA, input optical filter, non-linear power passes
There is module, light power meter PM and control and Digital Signal Processing Ctr-DSP in defeated function NPTF；
Described TDC, is used for receiving optical signal to be identified, and optical signal to be identified is applied certain C D
Value, its output optical signal enters described OA,
Described OA, is used for amplifying optical signal to certain power, then optical signal injects described NPTF
There is module；
There is module in described NPTF, for by big for input signal pulse peak power under certain C D value
Little it is mapped on output signal mean power size；
, there is the average power signal of module outfan for measuring NPTF in described PM；
TDC described in described Ctr-DSP module drive works in step-scan mode, and to scanning model
Enclose with step-length that to zoom in and out to record TDC under a series of different zoom ratio at equal pace scanned
In journey, NPTF output signal mean power is with the change curve of dispersion, and with speed is the letter of B by it
Number dispersion values-average power signal sample curve mate, obtain the scaling that matching degree is the highest
R, the speed of signal the most to be identified is
As preferably, NPTF occurs the working mechanism of module based on the four-wave mixing in nonlinear dielectric
(FWM) effect, now, NPTF occurs module to include semiconductor laser LD, photo-coupler
OC, nonlinear dielectric and output optical filter OF.Described TDC output frequency is ωsOptical signal,
After OA amplifies, producing frequency with described LD is ωpContinuous probe light close after ripple through described OC
Injecting described nonlinear dielectric, there is four-wave mixing in detection light and flashlight in described nonlinear dielectric
FWM effect, it is ω that this effect causes energy to be transferred to newly generated frequency by flashlighti=2ωs-ωp's
Unused light；Described unused light is leached by described OF, output to described PM.
Described nonlinear dielectric is highly nonlinear optical fiber HNLF or photonic crystal fiber or III-V chemical combination
Object wave is led or silica-based waveguides.
Preferred as another, NPTF occurs the working mechanism of module to be also based on semiconductor light detection
Two-photon absorption (TPA) effect in device.Now, NPTF occurs module to include having TPA effect
The photo-detector TPA-PD answered and driving and control circuit thereof form, and described TDC exports optical signal
Amplify injection described TPA-PD, described TPA-PD through described OA and output signals to described PM.
As another preferred, it is also possible to the working mechanism structure of reflection characteristic based on nonlinear fiber loop mirror
Make NPTF and module occurs, i.e. NPTF occurs module by nonlinear fiber loop mirror and to be used for controlling letter
The Polarization Controller composition of number polarization direction, described TDC output optical signal amplifies note through described OA
Entering described optic fibre environment input port, the output port of described optic fibre environment connects the input of described PM
End.
Described TDC device is based on fiber grating, GT etalon, liquid crystal on silicon (LCOS) or
Other can produce the device of a series of certain intervals CD value.
The present invention works without any prior information, it is adaptable to various modulation formats and the signal of speed,
There is simple in construction, the advantage that cost performance is high.
Accompanying drawing explanation
With detailed description of the invention, technical scheme is made the most below in conjunction with the accompanying drawings
Bright.
Fig. 1 is the rate identification system structure schematic diagram that the present invention is embodied as.
Fig. 2 is NPTF input-output wave shape schematic diagram.As seen from the figure, for peak value of pulse merit
The gain that input signal NPTF that rate is higher gives it is relatively big, and therefore the mean power of output signal is relatively
High.So input signal pulse peak power size can be mapped to the average merit of output signal by NPTF
On rate size.
The NPTF obtained based on FWM that Fig. 3 is.Input signal light peak power exists
Time between 18dBm-26dBm, it is logarithmic coordinates system that the slope of NPTF reaches 4.6(), it is 4.6
Power function, effectively can amplify the change of input signal peak value of pulse and be mapped to NPTF output signal
On mean power change.
Fig. 4--Fig. 6 gives the telescopic variation with speed of the CD-Power curve to 66%RZ signal
Situation, using as description example.Three kinds of speed are respectively 10GBaud, 28GBaud and 40GBaud
(ratio is 0.25:0.7:1), CD-Power curve ranges is respectively ± 5120, ± 640 and ± 320ps/nm,
Scaling is 16:2:1 ≈ (0.25)-2:(0.7)-2:1-2, it can be seen that curve telescopic variation just with letter
Square being inversely proportional to of number speed.
Detailed description of the invention
Full rate identification system as shown in Figure 1 includes: 1 Tunable Dispersion Compensator (TDC), 2
Image intensifer (OA), 3 input optical filters, 4 non-linear power transfer functions (NPTF) are sent out
Raw module, 5 light power meters (PM) and 6 control and Digital Signal Processing (Ctr-DSP) module.
Optical signal to be measured initially enters TDC, TDC and applies certain dispersion values to inputting optical signal to be identified
Rear output optical signal injects non-linear power transfer function NPTF after image intensifer amplifies and mould occurs
Block, light power meter is measured NPTF and module output end signal mean power is occurred；Control and digital signal
Processing module drives described TDC to work in step-scan mode, and presses same to sweep limits and step-length
It is defeated that one ratio zooms in and out to record under a series of different zoom ratio NPTF in TDC scanning process
Go out the average power signal change curve with dispersion, and by the dispersion values of signal that itself and speed are B-
Average power signal sample curve is mated, and obtains the scaling R that matching degree is the highest, then wait to know
The speed of level signal is
The working mechanism of NPTF generation module can also be based on the four-wave mixing in nonlinear dielectric
(FWM) effect, nonlinear dielectric can use highly nonlinear optical fiber (HNLF), as photon is brilliant
Body optical fiber, III-V compound waveguide or silica-based waveguides.Now NPTF occurs module to be swashed by quasiconductor
Light device (LD), photo-coupler (OC), highly nonlinear optical fiber (HNLF) and output light filtering
Device (OF) forms.(frequency is ω to TDC output optical signals) through OA amplify after and described LD
(frequency is ω to the continuous probe light producedp) after described OC closes ripple, inject described HNLF, detection
There is four-wave mixing (FWM) effect in light and flashlight in described HNLF, this effect causes energy
Amount is transferred to newly generated unused light by flashlight, and (frequency is ωi=2ωs-ωp).The instantaneous merit of unused light
Rate is the exponential type function of flashlight instantaneous power, and constitutes so-called " non-linear power transmission between the two
Function " (NPTF), the signal that input pulse peak power is higher is given bigger by this NPTF
Gain, on the contrary the least, therefore can be by input signal pulse peak power with the variation characteristic of CD
Amplify and be mapped to output unused smooth mean power with the variation characteristic of CD on.Unused light is by described
OF leaches, and measures its mean power size with described PM.There is the working machine of module in NPTF
Two-photon absorption (TPA) effect that reason is also based in semiconductor photodetector, now NPTF
It is made up of with control circuit the photo-detector (TPA-PD) and driving thereof with TPA effect, TDC
Output optical signal amplifies injection TPA-PD through OA, and measures TPA-PD output letter with described PM
Number mean power size.NPTF occurs the working mechanism of module to be also based on nonlinear fiber loop mirror
Reflection characteristic, now NPTF occur module by nonlinear fiber loop mirror and for control signal inclined
Shake direction Polarization Controller composition, TDC output optical signal through OA amplify injection fibre environment input
Port, and measure its optic fibre environment output port average power signal size with described PM.
As Figure 4-Figure 6 for obtain based on NPTF shown in Fig. 3 for 10GBaud, 28GBaud
CD-Power curve with the 66%RZ signal of 40GBaud.It can be seen that
CD-Power curve has periodically, the CD-Power curve x-axis scaling of different rates with
Square being inversely proportional to of speed.
Table 1-3 gives the knowledge of 3 kinds of conventional transfer rates of 9 kinds of modulation format signals as description example
Other result, in table, numerical value is the cross-correlation coefficient weighing actual measurement profile with sample curve matching degree.
Sample signal speed is B=40GBaud, and sample curve TDC sweep limits and step-length are
± 320ps/nm and 8ps/nm.The highest matching degree (i.e. maximum cross-correlation is depended in the judgement of signal rate
Coefficient) corresponding TDC sweep limits and the scaling R of step-length, i.e. judgement speed is equal to
Can be seen that nine kinds of all court verdicts of modulation format the most correctly identify signal rate.
Table 1,10GBaud speed nine kinds conventional modulation format signal rate recognition result
Table 2,28GBaud speed nine kinds conventional modulation format signal rate recognition result
Table 3,40GBaud speed nine kinds conventional modulation format signal rate recognition result
The rate identification workflow that this detailed description of the invention is described further below is as follows:
1) optical signal to be measured being inputted TDC device, NPTF occurs module and PM to be activated and in
Duty.TDC is controlling and is working in step-scan mode under DSP module driving.
2) TDC output optical signal is amplified into NPTF generation module through OA.
3) module outfan is occurred to use energy meter to measure its output signal mean power at NPTF.
4) control and DSP module drives described TDC to work in step-scan mode, and to scanning model
Enclose with step-length that to zoom in and out to record TDC under a series of different zoom ratio at equal pace scanned
In journey, NPTF output signal mean power is with the change curve of dispersion, and with speed is the letter of B by it
Number dispersion values-average power signal sample curve mate, obtain the scaling that matching degree is the highest
R, the speed of signal the most to be identified is
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme
And unrestricted, although the present invention being described in detail with reference to preferred embodiment, this area common
It will be appreciated by the skilled person that technical scheme can be modified or equivalent, and
Without departing from the spirit and scope of technical solution of the present invention, it all should contain the claim model in the present invention
In the middle of enclosing.
Claims (8)
1. an optical signal rate recognition methods, it is characterised in that relate to Tunable Dispersion Compensator TDC,
Image intensifer OA, inputs optical filter, and non-linear power transfer function NPTF occurs module, light
Energy meter PM and control and Digital Signal Processing Ctr-DSP module；Comprise the following steps:
Optical signal to be identified initially enters described TDC, described TDC and signal is applied dispersion CD value,
Its output optical signal injects described NPTF after described OA amplifying power and module occurs；
Described NPTF occurs module that the input signal pulse peak power under CD value is changed amplification also
Being mapped on the change of output signal mean power, described PM measures described NPTF and occurs module defeated
Go out the change of end signal mean power；
TDC described in described Ctr-DSP module drive works in step-scan mode, and to scanning model
Enclose with step-length that to zoom in and out to record TDC under a series of different zoom ratio at equal pace scanned
In journey, NPTF output signal mean power is with the change curve of dispersion, and with speed is the letter of B by it
Number dispersion values--average power signal sample curve is mated, obtain the pantograph ratio that matching degree is the highest
Example R, the speed of signal the most to be identified is
Optical signal rate recognition methods the most according to claim 1, it is characterised in that described general
NPTF output signal mean power is with the dispersion values of the signal that change curve and the speed of dispersion are B--
The algorithm that average power signal sample curve carries out mating includes cross correlation algorithm, feature recognition algorithms,
Maximum likelihood algorithm or neural network algorithm.
3. the system of the optical signal rate recognition methods described in a claim 1, it is characterised in that
Including: Tunable Dispersion Compensator TDC, image intensifer OA, input optical filter, non-linear power
There is module, light power meter PM and control and Digital Signal Processing in transfer function NPTF
Ctr-DSP；
Described TDC, is used for receiving optical signal to be identified, and optical signal to be identified is applied CD value,
Its output optical signal enters described OA,
Described OA, is used for amplifying optical signal power, then optical signal injects described NPTF and occurs
Module；
There is module in described NPTF, for by the change of the input signal pulse peak power under CD value
Change and amplify and be mapped on output signal mean power size variation；
, there is the average power signal of module outfan for measuring NPTF in described PM；
Described Ctr-DSP module, is used for driving described TDC to work in step-scan mode, and right
Sweep limits and step-length zoom in and out to record TDC under a series of different zoom ratio at equal pace
In scanning process, NPTF output signal mean power is with the change curve of dispersion, and by it with speed is
The dispersion values of the signal of B-average power signal sample curve is mated, and obtains the contracting that matching degree is the highest
Putting ratio R, the speed of signal the most to be identified is
The system of optical signal rate recognition methods the most according to claim 3, it is characterised in that
Described NPTF occurs module to include semiconductor laser LD, photo-coupler OC, nonlinear dielectric
With output optical filter OF；
Described TDC output frequency is ωsOptical signal, through OA amplify after, with described LD produce frequency
Rate is ωpContinuous probe light close through described OC and inject described nonlinear dielectric after ripple, detection light and letter
There is four-wave mixing FWM effect in number light in described nonlinear dielectric, this effect causes energy by believing
It is ω that number light is transferred to newly generated frequencyi=2 ωs-ωpUnused light；Described unused light is filtered by described OF
Go out, output to described PM.
The system of optical signal rate recognition methods the most according to claim 4, it is characterised in that
Described nonlinear dielectric is highly nonlinear optical fiber HNLF or photonic crystal fiber or III-V compound
Waveguide or silica-based waveguides.
The system of optical signal rate recognition methods the most according to claim 3, it is characterised in that
Described NPTF there is photo-detector TPA-PD that module includes having TPA effect and drive and
Control circuit forms, and described TDC output optical signal amplifies the described TPA-PD of injection through described OA,
Described TPA-PD outputs signals to described PM.
The system of optical signal rate recognition methods the most according to claim 3, it is characterised in that
Described NPTF occurs module by nonlinear fiber loop mirror and the polarization for control signal polarization direction
Controller forms, and described TDC output optical signal amplifies injection fibre environment input through described OA
Mouthful, the output port of described optic fibre environment connects the input of described PM.
The system of optical signal rate recognition methods the most according to claim 3, it is characterised in that
Described TDC device is based on fiber grating, GT etalon, liquid crystal on silicon (LCOS) or other
The one in the device of a series of intervals CD value can be produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310308540.1A CN103414517B (en) | 2013-07-22 | 2013-07-22 | A kind of optical signal rate recognition methods and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310308540.1A CN103414517B (en) | 2013-07-22 | 2013-07-22 | A kind of optical signal rate recognition methods and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103414517A CN103414517A (en) | 2013-11-27 |
| CN103414517B true CN103414517B (en) | 2016-08-10 |
Family
ID=49607505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310308540.1A Expired - Fee Related CN103414517B (en) | 2013-07-22 | 2013-07-22 | A kind of optical signal rate recognition methods and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103414517B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103944638B (en) * | 2014-04-18 | 2017-02-01 | 华中科技大学 | Optical signal modulation format recognition method and system based on nonlinear digital processing |
| CN105515666B (en) * | 2015-12-04 | 2018-06-19 | 华中科技大学 | A kind of optical signal chip rate recognition methods and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841368A (en) * | 2010-05-21 | 2010-09-22 | 华中科技大学 | All-optical dispersion monitor based on optical parameter amplifier |
| CN102347797A (en) * | 2011-11-02 | 2012-02-08 | 华中科技大学 | Multifunctional optical signal processing system |
| WO2012113339A1 (en) * | 2011-02-24 | 2012-08-30 | 华为技术有限公司 | Optical module device and method for receiving and transmitting signals |
| CN102882595A (en) * | 2012-10-29 | 2013-01-16 | 华中科技大学 | Large-range, anti-interference and total-blindness automated optical signal dispersion damage monitoring method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040000635A1 (en) * | 2002-06-27 | 2004-01-01 | Stephan Wielandy | Arrangement for automatically adjusting for accumulated chromatic dispersion in a fiber optic transmission system |
-
2013
- 2013-07-22 CN CN201310308540.1A patent/CN103414517B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101841368A (en) * | 2010-05-21 | 2010-09-22 | 华中科技大学 | All-optical dispersion monitor based on optical parameter amplifier |
| WO2012113339A1 (en) * | 2011-02-24 | 2012-08-30 | 华为技术有限公司 | Optical module device and method for receiving and transmitting signals |
| CN102347797A (en) * | 2011-11-02 | 2012-02-08 | 华中科技大学 | Multifunctional optical signal processing system |
| CN102882595A (en) * | 2012-10-29 | 2013-01-16 | 华中科技大学 | Large-range, anti-interference and total-blindness automated optical signal dispersion damage monitoring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103414517A (en) | 2013-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103234735B (en) | Measure the apparatus and method of electro-optic intensity modulator chirp parameter frequency response characteristic | |
| US9602198B2 (en) | Using fractional fourier transform nonlinear effects in optical fiber link monitoring methods | |
| Corcoran et al. | Silicon nanowire based radio-frequency spectrum analyzer | |
| CN102636694B (en) | Single-response microwave photonic filter-based frequency measurement device and measurement method | |
| CN103913185B (en) | Brillouin light fiber sensor system and method | |
| CN102914423B (en) | Measuring method for sag frequency of dispersion optical fiber | |
| CN103281120B (en) | A kind of optical signal modulation format identification method and system | |
| CN102281107A (en) | Dispersion measuring device and method for fiber optical device | |
| CN106253973A (en) | A kind of distance less fundamental mode optical fibre characteristic measurement method and device | |
| CN108827175A (en) | Distribution type fiber-optic dynamic strain sensing device and method based on wideband chaotic laser light | |
| CN103901700A (en) | Mini-type quantum relevancy photon pair source with adjustable wavelength and controllable frequency spectrum and generating method | |
| CN103575408A (en) | Coherent light detection system and method for optical fiber delay line phase control | |
| CN106225816B (en) | A kind of grating sensing apparatus and method based on Brillouin's wave filter | |
| CN104483657B (en) | Direction in space angle measuring system based on all-optical cross Polarization Modulation | |
| CN103414513B (en) | A kind of pulsed light dynamic extinction ratio measurement mechanism and method with high dynamic range | |
| CN104113378A (en) | Apparatus and method capable of tuning microwave signal source of semiconductor optical amplifier | |
| CN103414517B (en) | A kind of optical signal rate recognition methods and system | |
| CN102243102B (en) | Photoelectric measuring device capable of measuring power and wavelength at same time | |
| CN101216327A (en) | High precision optical fiber grating sensing signal demodulation instrument | |
| CN102384840B (en) | System for testing jumper wire with MPO connector | |
| CN103913423A (en) | Pulse broadband light source high-capacity photonic crystal fiber gas detection method, and system | |
| CN105353210B (en) | A kind of highly sensitive big bandwidth photon microwave frequency measurement apparatus and method | |
| CN102654715A (en) | All-optical modulation device and method based on micro-nano GaAs optical waveguide | |
| CN207317965U (en) | Based on Brillouin scattering and merge the distributed sensing system of chaos optical signal | |
| CN105871456A (en) | Signal quality monitoring method and system based on delay sampling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160810 Termination date: 20170722 |