CN106547119B - A kind of tunable multi-wavelength light source microwave photon filter and filtering method - Google Patents
A kind of tunable multi-wavelength light source microwave photon filter and filtering method Download PDFInfo
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- CN106547119B CN106547119B CN201610975233.2A CN201610975233A CN106547119B CN 106547119 B CN106547119 B CN 106547119B CN 201610975233 A CN201610975233 A CN 201610975233A CN 106547119 B CN106547119 B CN 106547119B
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- 230000003287 optical effect Effects 0.000 claims abstract description 31
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0126—Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass
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- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a kind of tunable multi-wavelength light source microwave photon filter and filtering methods.Filter of the invention includes a multi wave length illuminating source, the connection of the signal input part of the multi-wavelength light source output terminal and modulator, the modulator signal output end is connect through a dispersive medium with a programmable optical filter, and the signal input one after decaying is simultaneously balanced photodetector by the decaying of the subcarrier and its sideband of programmable optical FILTER TO CONTROL input.It can produce various types of filter through the invention.
Description
Technical field
The present invention relates to a kind of microwave photon filtering methods.By programmable optical pulse shaper, may be implemented to filter
Device tap coefficient is freely adjusted, and by difference photo-equilibrium detector, the negative tap coefficient of filter, program category may be implemented
In Microwave photonics field.
Background technique
Microwave photonics mainly study the interaction between microwave signal and optical signal, compared with traditional microwave system
Have many advantages, such as small in size, light weight and cost is low, not by electromagnetic interference, non-linear behaviour is good, application bandwidth is big, broadband without
There is deep application in the fields such as line communication, radar system, electronic countermeasure.Microwave photon filtering is a kind of important microwave signal process
Means, its sampling rate is high, facilitates tuning, not by electromagnetic interference, this method is widely used in multinomial scene.It is classical
Multi wave length illuminating source microwave photon filter, tunability is poor, due to tap number cannot be negative, can only realize low pass
Mode filter, limitation are larger.
It is some existing microwave photon filtering techniques below:
If Fig. 1 is the publication that Jilin University applies, 103986529 A of Publication No. CN.The program is based on phase tune
Stimulated Brillouin scattering effect caused by system and two pump signals, to realize that microwave photon filter dual-passband exports.
If Fig. 2 is the publication that Tsinghua University applies, 103259507 A of Publication No. CN, the program is based on frequency comb
It proposes a kind of no clutter interference microwave photon filter, can effectively inhibit spurious frequency.
If Fig. 3 is the publication that University of Science & Technology, Beijing applies, 101436904 A of Publication No. CN, the program realized
Tap coefficient.
Summary of the invention
This programme is a kind of freely programmable tuning microwave photon filter based on multi wave length illuminating source.Traditional multi-wavelength
The filtering of light source microwave photon is not easy to realize negative coefficient tap, and tuning performance is poor.This programme utilizes programmable optical filter and balance
The method of Photoelectric Detection realizes the microwave photon filtering that can program tuning control completely.Fig. 4 is the structure of this programme.
The technical solution of the present invention is as follows:
A kind of tunable multi-wavelength light source microwave photon filter, which is characterized in that including a multi wave length illuminating source, more waves
The connection of the signal input part of long light source output end and modulator, the modulator signal output end are programmable through a dispersive medium and one
Optical filter connection, the decaying of the subcarrier and its sideband of programmable optical FILTER TO CONTROL input are simultaneously defeated by the signal after decaying
Enter a balance photodetector.
Further, an image intensifer is connected between the dispersive medium and the programmable optical filter.
Further, which may be programmed the subcarrier for needing to realize positive coefficient tap and sideband from this
One output port of optical filter exports, by the subcarrier and sideband that need to realize negative coefficient tap from the programmable optical filter
Another output port output.
Further, the multi-wavelength light of the multi wave length illuminating source output is the multi-wavelength light for waiting frequency intervals.
A kind of filtering method of tunable multi-wavelength light source microwave photon filter, the steps include:
1) frequency response of target filter and the tap coefficient h (n) of the target filter are determined；
2) programmable optical filter is write according to the size of h (n) and symbol are positive and negative, decaying and the output for controlling optical wavelength are logical
All h (n) so that light comb spectral shape meets the distribution of h (n), and are positive corresponding light comb wavelet length and sideband from one by road
Channel output, corresponding light comb wavelet length that h (n) is negative and sideband are exported from another channel；
3) two output light paths of the programmable optical filter are detected to obtain filter with balance photodetector
Output.
Further, according to tap number N and sample frequency T=β2ωrThe tap system of the target filter is calculated in L
Number h (n)；Wherein, β2It is the second-order dispersion of dispersive medium, L is the length of dispersive medium, ωrIt is that multi wave length illuminating source repeats angular frequency
Rate.
The solution of the present invention principle is as follows, the multi-wavelength light of the frequency intervals such as multi wave length illuminating source output, the following institute of expression formula
Show
Wherein Es(t) N is multi wave length illuminating source number of wavelengths, and I (n) is the light intensity of n-th of wavelet length, ω0For first optical wavelength
Angular frequency, ωrIt is that multi wave length illuminating source repeats angular frequency, t is the time
Assuming that modulator is double sideband modulation.The transfer function of modulator is as follows:
Wherein EmIt (t) is modulator output signal, VRFFor radiofrequency signal, JnIt (x) is n rank Bessel function, ARFAnd ωRFPoint
Not Wei radiofrequency signal amplitude and angular frequency, VπFor modulator half-wave voltage.
After being modulated by microwave signal, optical signal is transmitted by dispersive medium, each subcarrier and sideband introduce one with
The related addition Item θ (ω) of frequency, is described as follows
Wherein β2It is the second-order dispersion of dispersive medium, the dispersion of higher order is ignored.L is the length of dispersive medium.
Using a programmable optical filter, the sideband of programming Control each subcarrier and they can be distinguished, new
Subcarrier intensity is set as Is(n).Programmable optical filter can be with each subcarrier of programming Control and their sideband from different
Optical output.By select by all subcarriers from 2 different light paths export after (by the son of institute's realization positive coefficient tap in need
Carrier and sideband is exported from 1 port, the subcarrier and sideband of institute's realization negative coefficient tap in need, defeated from second port
Out), through overbalance photodetection, the electric signal that is exported are as follows:
Wherein EoIt (t) is balance photodetection output signal.
In conclusion system transter is
T=β2ωrL
And the transmission function of typical case's FIR mode filter is
Comparing can obtain, and the system that scheme is proposed realizes the microwave photon filter of freely programmable control, adopt
Sample rate is by second-order dispersion, repetition angular frequency three's comprehensively control of dispersive medium length and multi wave length illuminating source, samples in the present invention
Rate is the inverse of T, T=β2ωrL。
G (ω) is the decline generated in dispersive medium by different modulating.Comparatively, single sideband modulation can introduce phase
, the condition of linear phase is destroyed, phase-modulation constrains practical application in the response very little of low-frequency range.Double sideband modulation
The amplitude response of longitudinal cosine type is introduced, but phase is not influenced, this can be carried out by the pretreatment responded to filter amplitudes
Compensation.
Compared with prior art, the positive effect of the present invention are as follows:
By fixed structure, various types of filter, such as low pass can produce, high pass, band logical, band hinders, more
Passband, more stopbands etc..All filter response parameters, such as band connection frequency, cutoff frequency, ripple factor etc. can pass through electricity
Brain programming Control is realized.Fig. 5 is the experimental result of some programs, can be with physics realization arbitrary shape by the technology of this programme
The filter of shape frequency response, this is function not available for existing technology.
Detailed description of the invention
Fig. 1 is the filter graph architecture of Zhejiang University's application；
Fig. 2 is the filter graph architecture of Tsinghua University's application；
Fig. 3 is the filter graph architecture of University of Science & Technology, Beijing's application；
Fig. 4 is filter construction schematic diagram of the present invention；
Fig. 5 is four kinds of exemplary filter filter effect figures；
(a) low-pass filter, (b) high-pass filter, (c) bandpass filter, (d) bandstop filter；
Fig. 6 is the theoretical frequency response figure of three-passband filter；
Fig. 7 is practical frequency response and the theory frequency response comparison diagram of three-passband filter.
Specific embodiment
The present invention is explained in further detail with reference to the accompanying drawing.
Embodiment
For generating a three-passband filter.
Step 1. determines target filter frequency response, such as cutoff frequency, band connection frequency, stopband inhibit and passband ripple, such as
Shown in Fig. 6.
Step 2. is according to the tap number N and sample frequency f of filters=1/ β2(ω)ωrTarget filter is calculated in L
The tap coefficient h (n) (window function metht, Frequency Sampling Method etc. can be used) of wave device.
The link of step 2. system is as it appears from the above, the input of filter is the radio-frequency head of electrooptic modulator.
Step 3. is positive and negative according to the size and symbol of h (n), writes programmable optical filter.
Programmable optical filter can control the decaying and output channel of each optical wavelength.
By adjusting the decaying of light comb wavelength, so that light comb spectral shape meets the distribution of h (n).
By adjusting output channel, by all h (n) be positive corresponding light comb wavelet length and sideband it is defeated from one of channel
Out, be negative corresponding light comb wavelet length and sideband of h (n) is exported from another one channel.
2 output light paths of programmable optical filter are detected to obtain filter by step 4. with balance photodetector
Output, as shown in Figure 7.
Claims (5)
1. a kind of tunable multi-wavelength light source microwave photon filter, which is characterized in that including a multi wave length illuminating source, the multi-wavelength
The connection of the signal input part of light source output end and modulator, the modulator signal output end is through a dispersive medium and a programmable optical
Filter connection, the decaying of the subcarrier and its sideband of programmable optical FILTER TO CONTROL input simultaneously input the signal after decaying
One balance photodetector；Wherein, the programmable optical filter by need to realize positive coefficient tap subcarrier and sideband from this
One output port of programmable optical filter exports, by the subcarrier and sideband that need to realize negative coefficient tap from the programmable optical
Another output port of filter exports.
2. tunable multi-wavelength light source microwave photon filter as described in claim 1, which is characterized in that the dispersive medium with
An image intensifer is connected between the programmable optical filter.
3. tunable multi-wavelength light source microwave photon filter as described in claim 1, which is characterized in that the multi-wavelength light
The multi-wavelength light of source output is the multi-wavelength light for waiting frequency intervals.
4. a kind of filtering method based on tunable multi-wavelength light source microwave photon filter described in claim 1, the steps include:
1) frequency response of target filter and the tap coefficient h (n) of the target filter are determined；
2) programmable optical filter is write according to the size of h (n) and symbol are positive and negative, controls the decaying and output channel of optical wavelength,
So that light comb spectral shape meets the distribution of h (n), and all h (n) are positive corresponding light comb wavelet length and sideband from a channel
Output, corresponding light comb wavelet length that h (n) is negative and sideband are exported from another channel；
3) two output light paths of the programmable optical filter are detected to obtain the output of filter with balance photodetector.
5. filtering method as claimed in claim 4, which is characterized in that according to tap number N and sample frequency T=β2ωrL meter
Calculation obtains the tap coefficient h (n) of the target filter；Wherein, β2It is the second-order dispersion of dispersive medium, L is the length of dispersive medium
Degree, ωrIt is that multi wave length illuminating source repeats angular frequency.
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| CN107328474B (en) * | 2017-05-22 | 2019-03-22 | 北京大学 | A kind of high resolution spectral measuring system based on frequency comb |
| CN114002648A (en) * | 2021-09-14 | 2022-02-01 | 广西电网有限责任公司南宁供电局 | Ground penetrating radar car for cable identification with anti-interference effect |
| EP4160300A1 (en) * | 2021-09-30 | 2023-04-05 | Rohde & Schwarz GmbH & Co. KG | Frequency-dependent microwave filter, arrangement comprising the same, and method of frequency-dependent microwave filtering |
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| CN103235374A (en) * | 2013-04-15 | 2013-08-07 | 华中科技大学 | Microwave photon filter of multi-wavelength light source and tuning and reconfiguring method of microwave photon filter |
| CN103247933A (en) * | 2013-04-18 | 2013-08-14 | 江苏金迪电子科技有限公司 | Programmable multi-wavelength adjustable optical fiber laser and multi-wavelength filtering method thereof |
| CN104898305A (en) * | 2015-06-25 | 2015-09-09 | 天津理工大学 | Variable-coefficient microwave photonic filter based on wavelength interval tunable laser |
| CN104932121A (en) * | 2015-06-25 | 2015-09-23 | 天津理工大学 | Microwave photon filter based on multi-wavelength fiber laser and chirp Bragg gratings |
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| US7974534B2 (en) * | 2006-08-11 | 2011-07-05 | Purdue Research Foundation | Wideband microwave and millimeter wave filters using photonic spectral filtering |
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| CN103235374A (en) * | 2013-04-15 | 2013-08-07 | 华中科技大学 | Microwave photon filter of multi-wavelength light source and tuning and reconfiguring method of microwave photon filter |
| CN103247933A (en) * | 2013-04-18 | 2013-08-14 | 江苏金迪电子科技有限公司 | Programmable multi-wavelength adjustable optical fiber laser and multi-wavelength filtering method thereof |
| CN104898305A (en) * | 2015-06-25 | 2015-09-09 | 天津理工大学 | Variable-coefficient microwave photonic filter based on wavelength interval tunable laser |
| CN104932121A (en) * | 2015-06-25 | 2015-09-23 | 天津理工大学 | Microwave photon filter based on multi-wavelength fiber laser and chirp Bragg gratings |
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