CN107702888B - For detecting the device and method of electro-optic phase modulator bandwidth - Google Patents
For detecting the device and method of electro-optic phase modulator bandwidth Download PDFInfo
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- CN107702888B CN107702888B CN201710847602.4A CN201710847602A CN107702888B CN 107702888 B CN107702888 B CN 107702888B CN 201710847602 A CN201710847602 A CN 201710847602A CN 107702888 B CN107702888 B CN 107702888B
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- polarizer
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 55
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 230000010287 polarization Effects 0.000 claims description 15
- 230000005284 excitation Effects 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 6
- 230000004043 responsiveness Effects 0.000 claims description 3
- 238000003012 network analysis Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000005428 wave function Effects 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910003327 LiNbO3 Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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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
- H04B10/073—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an out-of-service signal
- H04B10/0731—Testing or characterisation of optical devices, e.g. amplifiers
Abstract
The invention proposes a kind of for detecting the device and method of electro-optic phase modulator bandwidth, and described device includes light source, the polarizer, birefringent device, analyzer, optical detector and vector network analyzer；The method have the benefit that: it proposes a kind of for detecting the device and method of electro-optic phase modulator bandwidth, compared with prior art, when carrying out bandwidth detection using the present invention, detection process is affected by temperature small, it can survey that type of device is more, and measurement result is accurate.
Description
Technical field
The present invention relates to a kind of electro-optic phase modulator bandwidth detection technologies, more particularly to one kind is for detecting electric light phase
The device and method of modulator bandwidth.
Background technique
Electro-optic phase modulator is fiber optic communication, the important devices in sensor-based system, can be used for electro-optic frequency translation, spectrum exhibition
Width, the phase shift of photon wide-band microwave and frequency displacement and photonic time delay etc..Since electro-optic phase modulator has without biasing, line
The advantages that property modulation depth is big, is more and more paid attention in Larger Dynamic microwave photon link in recent years.Bandwidth is electric light
The important parameter of modulator, but since the phase-modulated information in electro-optic phase modulator output signal can not be by photodetector
Direct detection, therefore its bandwidth can not be measured directly.
Currently, can to the method that electro-optic phase modulator bandwidth measures substantially there are three types of: 1) be directed to LiNbO3Base
Titanium diffused waveguide electro-optic phase modulator, using TEMould and TMPhase-intensity-conversion is realized in the light interference of mould, thus real
Existing bandwidth measurement, but this method is only applicable to that T can be propagated simultaneouslyEMould and TMThe titanium that modulation efficiency is different on mould and both direction expands
Waveguide electro-optic phase-modulator is dissipated, applicable surface is relatively narrow；2) Mach-Zehnder interferometer is built, electro-optic phase modulator is installed
In on a wherein arm, this method can measure the bandwidth with the electro-optic phase modulator for being polarized function, and the temperature of this method is stablized
Property and operability are all poor, and measurement result accuracy is lower；3) using F-P type optical filter progress bandwidth measurement, but due to
There are multi-stage lights to interfere inside F-P type optical filter, and measuring result error is larger.
Summary of the invention
For the problems in background technique, the invention proposes a kind of for detecting the dress of electro-optic phase modulator bandwidth
It sets, electro-optic phase modulator to be detected is abbreviated as device, the structure of device are as follows: described device includes light source, the polarizer, two-fold
Emitter part, analyzer, optical detector and vector network analyzer；The output end of the light source and the light carrier input terminal light of device
Road connection, the output end of device and the input terminal optical path of the polarizer connect, the input of the output end of the polarizer and birefringent device
Optical path connection is held, the output end of birefringent device and the input terminal optical path of optical detector connect, the output end and arrow of optical detector
Measure the detection signal input part electrical connection of Network Analyzer；The RF excited output end of vector network analyzer and penetrating for device
Frequency input terminal electrical connection；
The light source is used to provide light carrier for device；
The birefringent device uses polarization-maintaining fiber coil；
The polarization axle of the polarizer and the T of deviceEMould or TMMould it is axially aligned, meanwhile, the polarization axle of the polarizer and double
The fast axle of refractive element angle at 45 °；
The fast axle angle at 45 ° of the polarization axle of the analyzer and birefringent device；
The vector network analyzer can be scanned device by rf excitation signal, and optical detector can will collect
Optical signal exported in real time to vector network analyzer；Frequency range when vector network analyzer scans is the Δ of min~1200/
T, min are the lower-frequency limit that vector network analyzer can be provided, and Δ t is the fast axle of birefringent device and the light delay of slow axis.
The invention also provides a kind of method for detecting electro-optic phase modulator bandwidth, for example preceding institute of related hardware
It states, specific method includes:
The signal that the vector network analyzer receives from optical detector is denoted as global response degree；Vector network analysis
The frequency for the rf excitation signal that instrument exports every time is denoted as fi, fi∈ [min, 1200/ Δ t], the responsiveness parameter is denoted as Si,
SiWith fiIt corresponds；After vector network analyzer (6) completes scan operation by the frequency range, it is calculated as follows out
Corresponding response device degree Qi:
QiWith fiIt corresponds；By multiple QiIt is depicted as curve, the curve is the bandwidth curve of device.
The principle of the present invention is: based on existing theory it is found that the wave function of non-modulated light carrier can be shown by following formula:
Wherein, E indicates the wave function of light carrier, and A is the amplitude of light carrier electric field, is constant, and c is the light velocity, and unit is (m/
S), t is the time corresponding with light carrier, and unit is (Ps), and λ indicates that the wavelength of light carrier, λ are constant, and unit is (nm)；
Light carrier through electro-optic phase modulator after the modulation of a sinusoidal signal, adjust by light carrier after being modulated
The wave function of light carrier can be shown by following formula after system:
Wherein, m is the index of modulation of modulator, and a is the amplitude of rf modulated signal, and f is the frequency for inputting modulation signal
Rate, unit are (GHz)；
Continue to be split light carrier after modulation, be delayed, close beam processing, obtains output optical signal, output optical signal
Expression formula can be shown by following formula:
The company that above formula abbreviation can be as follows multiplies form:
Eout=ABC
Wherein,
B
For periodic signal, frequency mainly withCorrelation, the magnitude of frequency are 1014It is close with frequency of light wave；
C
For periodic signal, frequency is related to 0.002 π f, and frequency f is identical as modulation signal frequency.
According to the existing theory, the light intensity I of output optical signal is proportional to (A2·B2·C2), wherein due to B2Frequency with
Frequency of light wave is same magnitude, can not be detected by optical detector, therefore do not consider；C2Frequency and frequency modulating signal f phase
It closes, and is the optical signal single factor varying with frequency for causing optical detector to receive, therefore continue to C2It is analyzed:
C2Expression formula are as follows:
When the input electrical signal of vector network analyzer is very small (a is very small), it is believed that input signal is small letter
Number, it at this time can be by C2It is approximately:
C2≈k·[a·m·sin(0.002πft+0.001πfΔt)·sin(0.001πfΔt)]2
Wherein, k serves as reasonsThe constant of decision then can also indicate above formula are as follows:
C2∝[a·m·sin(0.002πft+0.001πfΔt)·sin(0.001πfΔt)]2
For the ease of illustrating, by [amsin (0.002 π ft+0.001 π f Δ t)] in formula2It is abbreviated as g (f), [sin
(0.001πfΔt)]2It is abbreviated as h (f), g (f) is related to phase-modulator, and h (f) is related to the delay time Δ t of fiber optic loop,
In the case where λ and Δ t is known situation,H (f) need to only be eliminated for known quantity if g (f) to be solved,
According to the prior art it is found that the test result of vector network analyzer can be by Si=10log [g (f) h (f)] is expressed, then
G (f) can be indicated are as follows:
G (f) is converted to logarithmic form Q againiIt can obtain following formula:
Bring the parameter of h (f) into QiIt can obtain:
Due to Q it can be seen from the analysis of frontiThe each factor expressed in showing is known quantity, therefore we can use Qi
To reflect the bandwidth of electro-optic phase modulator.
The method have the benefit that: propose a kind of device for detecting electro-optic phase modulator bandwidth and side
Method, compared with prior art, when carrying out bandwidth detection using the present invention, detection process is affected by temperature small, can survey type of device
More, measurement result is accurate.
Detailed description of the invention
Fig. 1, electronic schematic diagram of the invention；
Fig. 2, the S measured by vector network analyzeriCurve；
Fig. 3, the Q calculated by Fig. 2 curveiCurve；
Title corresponding to each label is respectively as follows: light source 1, the polarizer 2, birefringent device 3, analyzer 4, light and visits in figure
Survey device 5, vector network analyzer 6.
Specific embodiment
It is a kind of for detecting the device of electro-optic phase modulator bandwidth, electro-optic phase modulator to be detected is abbreviated as device
7, innovation is: described device includes light source 1, the polarizer 2, birefringent device 3, analyzer 4, optical detector 5 and vector net
Network analyzer 6；The output end of the light source 1 is connect with the light carrier input terminal optical path of device 7, the output end of device 7 be polarized
The input terminal optical path of device 2 connects, and the output end of the polarizer 2 is connect with the input terminal optical path of birefringent device 3, birefringent device 3
Output end connect with the input terminal optical path of optical detector 5, the detection of the output end of optical detector 5 and vector network analyzer 6
Signal input part electrical connection；The RF excited output end of vector network analyzer 6 electrically connects with the rf inputs of device 7
It connects；
The light source 1 is used to provide light carrier for device 7；
The birefringent device 3 uses polarization-maintaining fiber coil；
The polarization axle of the polarizer 2 and the T of device 7EMould or TMMould it is axially aligned, meanwhile, the polarization axle of the polarizer 2
With the fast axle angle at 45 ° of birefringent device 3；
The fast axle angle at 45 ° of the polarization axle of the analyzer 4 and birefringent device 3；
The vector network analyzer 6 can be scanned device 7 by rf excitation signal, and optical detector 5 can will be adopted
The optical signal collected is exported in real time to vector network analyzer 6；Vector network analyzer 6 scan when frequency range be min~
1200/ Δ t, min is the lower-frequency limit that vector network analyzer 6 can be provided, and Δ t is the fast axle and slow axis of birefringent device 3
Light delay.
A method of for detecting electro-optic phase modulator bandwidth, related hardware includes: electric light phase to be detected
Position modulator is abbreviated as device 7, and described device includes light source 1, the polarizer 2, birefringent device 3, analyzer 4,5 and of optical detector
Vector network analyzer 6；The output end of the light source 1 is connect with the light carrier input terminal optical path of device 7, the output end of device 7
It is connect with the input terminal optical path of the polarizer 2, the output end of the polarizer 2 is connect with the input terminal optical path of birefringent device 3, birefringent
The output end of device 3 is connect with the input terminal optical path of optical detector 5, output end and the vector network analyzer 6 of optical detector 5
Detect signal input part electrical connection；The RF excited output end and the rf inputs of device 7 of vector network analyzer 6 are electrical
Connection；
The light source 1 is used to provide light carrier for device 7；
The birefringent device 3 uses polarization-maintaining fiber coil；
The polarization axle of the polarizer 2 and the T of device 7EMould or TMMould it is axially aligned, meanwhile, the polarization axle of the polarizer 2
With the fast axle angle at 45 ° of birefringent device 3；
The fast axle angle at 45 ° of the polarization axle of the analyzer 4 and birefringent device 3；
The vector network analyzer 6 can be scanned device 7 by rf excitation signal, and optical detector 5 can will be adopted
The optical signal collected is exported in real time to vector network analyzer 6；Vector network analyzer 6 scan when frequency range be min~
1200/ Δ t, min is the lower-frequency limit that vector network analyzer 6 can be provided, and Δ t is the fast axle and slow axis of birefringent device 3
Light delay；
Its innovation is: the described method includes:
The signal that the vector network analyzer 6 receives from optical detector 5 is denoted as global response degree；Vector network point
The frequency for the rf excitation signal that analyzer 6 exports every time is denoted as fi, fi∈ [min, 1200/ Δ t], the responsiveness parameter is denoted as
Si, SiWith fiIt corresponds；After vector network analyzer 6 completes scan operation by the frequency range, it is calculated as follows out
Corresponding response device degree Qi:
QiWith fiIt corresponds；By multiple QiIt is depicted as curve, the curve is the bandwidth curve of device 7.
Claims (2)
1. a kind of for detecting the device of electro-optic phase modulator bandwidth, electro-optic phase modulator to be detected is abbreviated as device
(7), it is characterised in that: described device includes light source (1), the polarizer (2), birefringent device (3), analyzer (4), optical detector
(5) and vector network analyzer (6)；The output end of the light source (1) is connect with the light carrier input terminal optical path of device (7), device
The output end of part (7) is connect with the input terminal optical path of the polarizer (2), and the output end of the polarizer (2) is defeated with birefringent device (3)
Enter optical path is held to connect, the output end of birefringent device (3) is connect with the input terminal optical path of optical detector (5), optical detector (5)
Output end and the detection signal input part of vector network analyzer (6) are electrically connected；The RF excited of vector network analyzer (6)
Output end and the rf inputs of device (7) are electrically connected；
The light source (1) is used to provide light carrier for device (7)；
The birefringent device (3) uses polarization-maintaining fiber coil；
The polarization axle of the polarizer (2) and the T of device (7)EMould or TMMould it is axially aligned, meanwhile, the polarization of the polarizer (2)
The fast axle angle at 45 ° of axis and birefringent device (3)；
The polarization axle of the analyzer (4) and the fast axle angle at 45 ° of birefringent device (3)；
The vector network analyzer (6) can be scanned device (7) by rf excitation signal, and optical detector (5) can incite somebody to action
Collected optical signal is exported in real time to vector network analyzer (6)；Vector network analyzer (6) scan when frequency range be
The Δ of min~1200/ t, min are the lower-frequency limit that vector network analyzer (6) can be provided, and Δ t is the fast of birefringent device (3)
The delay of the light of axis and slow axis.
2. a kind of method for detecting electro-optic phase modulator bandwidth, related hardware includes: electric light phase to be detected
Modulator is abbreviated as device (7), and used device includes light source (1), the polarizer (2), birefringent device (3), analyzer
(4), optical detector (5) and vector network analyzer (6)；The output end of the light source (1) and the light carrier input terminal of device (7)
Optical path connection, the output end of device (7) connect with the input terminal optical path of the polarizer (2), the output end of the polarizer (2) with it is birefringent
The input terminal optical path of device (3) connects, and the output end of birefringent device (3) is connect with the input terminal optical path of optical detector (5), light
The output end of detector (5) and the detection signal input part of vector network analyzer (6) are electrically connected；Vector network analyzer
(6) rf inputs of RF excited output end and device (7) are electrically connected；
The light source (1) is used to provide light carrier for device (7)；
The birefringent device (3) uses polarization-maintaining fiber coil；
The polarization axle of the polarizer (2) and the T of device (7)EMould or TMMould it is axially aligned, meanwhile, the polarization of the polarizer (2)
The fast axle angle at 45 ° of axis and birefringent device (3)；
The polarization axle of the analyzer (4) and the fast axle angle at 45 ° of birefringent device (3)；
The vector network analyzer (6) can be scanned device (7) by rf excitation signal, and optical detector (5) can incite somebody to action
Collected optical signal is exported in real time to vector network analyzer (6)；Vector network analyzer (6) scan when frequency range be
The Δ of min~1200/ t, min are the lower-frequency limit that vector network analyzer (6) can be provided, and Δ t is the fast of birefringent device (3)
The delay of the light of axis and slow axis；
It is characterized by: the described method includes:
The signal that the vector network analyzer (6) receives at optical detector (5) is denoted as global response degree；Vector network point
The frequency for the rf excitation signal that analyzer (6) exports every time is denoted as fi, fi∈ [min, 1200/ Δ t], the vector network analysis
The responsiveness parameter of instrument (6) is denoted as Si, SiWith fiIt corresponds；When vector network analyzer (6) is completed by the frequency range
After scan operation, corresponding response device degree Q is calculated as follows outi:
QiWith fiIt corresponds；By multiple QiIt is depicted as curve, the curve is the bandwidth curve of device (7).
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-
2017
- 2017-09-19 CN CN201710847602.4A patent/CN107702888B/en active Active
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