CN106547119A - 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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- CN106547119A CN106547119A CN201610975233.2A CN201610975233A CN106547119A CN 106547119 A CN106547119 A CN 106547119A CN 201610975233 A CN201610975233 A CN 201610975233A CN 106547119 A CN106547119 A CN 106547119A
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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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- Physics & Mathematics (AREA)
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- General Physics & Mathematics (AREA)
- 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 method.The wave filter of the present invention includes a multi wave length illuminating source, the multi-wavelength light source output terminal is connected with the signal input part of modulator, mono- dispersive medium of modulator signal output end Jing is connected with a programmable optical wave filter, and the signal input one after decay is simultaneously balanced photodetector by the decay of the subcarrier and its sideband of the programmable optical FILTER TO CONTROL input.Various types of wave filter can be produced by the present invention.
Description
Technical field
The present invention relates to a kind of microwave photon filtering method.By programmable optical pulse shaper, it is possible to achieve filtering
Device tap coefficient is freely adjusted, by difference photo-equilibrium detector, it is possible to achieve the negative tap coefficient of wave filter, program category
In Microwave photonics field.
Background technology
Microwave photonics mainly study the interaction between microwave signal and optical signal, compared with traditional microwave system
There is small volume, lightweight, low cost, by electromagnetic interference, non-linear behaviour be 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 are high, and convenient to tune, 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, as tap number can not be negative, therefore can only realize low pass
Mode filter, limitation are larger.
The following is some existing microwave photon filtering techniques：
As Fig. 1 be Jilin University application publication, 103986529 A of Publication No. CN.The program is adjusted based on phase place
The stimulated Brillouin scattering effect that system and two pump signals cause, so as to realize that microwave photon filter dual-passband is exported.
If Fig. 2 is the publication of Tsing-Hua University's application, 103259507 A of Publication No. CN, the program are based on frequency comb
Propose that one kind, without clutter interference microwave photon filter, can effectively suppress spurious frequency.
If Fig. 3 is the publication of University of Science ＆ Technology, Beijing's application, 101436904 A of Publication No. CN, the program are realized
Tap coefficient.
The content 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 difficult to realize negative coefficient tap that tuning performance is poor.This programme utilizes programmable optical wave 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 scheme is that：
A kind of tunable multi-wavelength light source microwave photon filter, it is characterised in that including a multi wave length illuminating source, many ripples
Long light source output end is connected with the signal input part of modulator, and mono- dispersive medium of modulator signal output end Jing and may be programmed
Optical filter connects, and the decay of the subcarrier and its sideband of the programmable optical FILTER TO CONTROL input simultaneously will be the signal after decay defeated
Enter a balance photodetector.
Further, connect an image intensifer between the dispersive medium and the programmable optical wave filter.
Further, the programmable optical wave filter will need the subcarrier and sideband of realizing positive coefficient tap to may be programmed from this
The one output port output of optical filter, it would be desirable to realize the subcarrier and sideband of negative coefficient tap from the programmable optical wave filter
The output of another output port.
Further, the multi-wavelength light of the multi wave length illuminating source output is the multi-wavelength light for waiting frequency interval.
A kind of filtering method of tunable multi-wavelength light source microwave photon filter, its step is：
1) frequency response of target filter, and tap coefficient h (n) of the target filter are determined；
2) programmable optical wave filter is write according to the size and symbol of h (n) are positive and negative, the decay and output for controlling optical wavelength is logical
Road so that light comb spectral shape meets the distribution of h (n), and be just corresponding light comb wavelet length and sideband from one by all h (n)
Passage exports, is that negative corresponding light comb wavelet length and sideband are exported from another passage by h (n)；
3) two output light paths of the programmable optical wave filter are carried out detecting with balance photodetector and obtains wave filter
Output.
Further, according to tap number N and sample frequency T=β2ωrL is calculated the tap system of the target filter
Number h (n)；Wherein, β2It is the 2nd order chromatic 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 interval such as multi wave length illuminating source output, the following institute of expression formula
Show
Wherein EsT () N is multi wave length illuminating source number of wavelengths, I (n) is the light intensity of n-th wavelet length, ω0For first optical wavelength
Angular frequency, ωrIt is that multi wave length illuminating source repeats angular frequency, t is the time
Hypothesis modulator is double sideband modulation.The transfer function of modulator is as follows：
Wherein EmT () is modulator output signal, VRFFor radiofrequency signal, JnX () is n rank Bessel functions, 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 through dispersive medium, each subcarrier and sideband introduce one with
The relevant addition Item θ (ω) of frequency, is described as follows
Wherein β2It is the 2nd order chromatic dispersion of dispersive medium, the dispersion of higher order is ignored.L is the length of dispersive medium.
Using a programmable optical filter, each subcarrier of programming Control and their sideband can be distinguished, it is new
Subcarrier intensity is set to Is(n).Programmable optical wave filter can be with each subcarrier of programming Control and their sideband from different
Light path is exported.By select by all subcarriers from after the output of 2 different light paths (by the son for realizing positive coefficient tap in need
Carrier and sideband, from the output of 1 port, the subcarrier and sideband for realizing negative coefficient tap in need, it is defeated from second port
Go out), through balancing photodetection, the electric signal for obtaining exporting is：
Wherein EoT () is balance photodetection output signal.
In sum, system transter is
T=β2ωrL
And the transmission function of typical case's FIR mode filter is
Comparison can be obtained, and the system proposed by scheme realizes the microwave photon filter of a freely programmable control, adopts
Repetition angular frequency three Comprehensive Control of the sample rate by 2nd order chromatic dispersion, dispersive medium length and multi wave length illuminating source, samples in the present invention
Inverse of the rate for T, T=β2ωrL。
G (ω) is the decline produced in dispersive medium by different modulating.Comparatively, single sideband modulation can introduce phase place
, 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 place is not affected, this can be carried out by the pretreatment responded to filter amplitudes
Compensation.
Compared with prior art, the positive effect of the present invention is：
By fixed structure, various types of wave filter, such as low pass can be produced, high pass, band logical, band resistance are more
Passband, many stopbands etc..All wave filter response parameters, such as band connection frequency, cut-off frequency, ripple factor etc., can be by electricity
Brain programming Control is realized.Fig. 5 is the experimental result of some programs, by the technology of this programme, can be with physics realization arbitrary shape
The wave filter of shape frequency response, this is the function not available for existing technology.
Description of the drawings
Fig. 1 is the filter graph architecture of Zhejiang University's application；
Fig. 2 is the filter graph architecture of Tsing-Hua 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；
Theoretical frequency response figures of the Fig. 6 for three-passband filter；
Actual frequency response and theoretical frequency response comparison diagram of the Fig. 7 for three-passband filter.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is explained in further detail.
Embodiment
As a example by producing a three-passband filter.
Step 1. determines target filter frequency response, and such as cut-off frequency, band connection frequency, stopband suppresses and passband ripple etc., such as
Shown in Fig. 6.
Tap number N of the step 2. according to wave filter, and sample frequency fs=1/ β2(ω)ωrL is calculated the target and filters
Tap coefficient h (n) (window function metht, Frequency Sampling Method etc. can be used) of ripple device.
The link of step 2. system is as it appears from the above, the input of wave 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 wave filter.
Programmable optical wave filter can control the decay of each optical wavelength and output channel.
By the decay for adjusting light comb wavelength so that light comb spectral shape meets the distribution of h (n).
By adjusting output channel, it is that just corresponding light comb wavelet length and sideband are defeated from one of passage by all h (n)
Go out, h (n) is exported from other in which passage to bear corresponding light comb wavelet length and sideband.
2 output light paths of programmable optical wave filter are obtained wave filter with balance photodetector detection by step 4.
Output, as shown in Figure 7.
Claims (6)
1. a kind of tunable multi-wavelength light source microwave photon filter, it is characterised in that including a multi wave length illuminating source, the multi-wavelength
Light source output end is connected with the signal input part of modulator, mono- dispersive medium of modulator signal output end Jing and a programmable optical
Wave filter connects, the decay of the subcarrier and its sideband of programmable optical FILTER TO CONTROL input by the signal input after decay
One balance photodetector.
2. tunable multi-wavelength light source microwave photon filter as claimed in claim 1, it is characterised in that the dispersive medium with
Connect an image intensifer between the programmable optical wave filter.
3. tunable multi-wavelength light source microwave photon filter as claimed in claim 1 or 2, it is characterised in that this may be programmed
Optical filter will need the subcarrier and sideband of realizing positive coefficient tap to export from an output port of the programmable optical wave filter,
To need to realize another output port output of the subcarrier and sideband of negative coefficient tap from the programmable optical wave filter.
4. tunable multi-wavelength light source microwave photon filter as claimed in claim 1, it is characterised in that the multi-wavelength light
The multi-wavelength light of source output is the multi-wavelength light for waiting frequency interval.
5. a kind of filtering method based on tunable multi-wavelength light source microwave photon filter described in claim 1, its step is：
1) frequency response of target filter, and tap coefficient h (n) of the target filter are determined；
2) positive and negative decay and the output channel write programmable optical wave filter, control optical wavelength of size and symbol according to h (n),
So that light comb spectral shape meets the distribution of h (n), and it is just corresponding light comb wavelet length and sideband from a passage by all h (n)
Export, be that negative corresponding light comb wavelet length and sideband are exported from another passage by h (n)；
3) two output light paths of the programmable optical wave filter are carried out detecting the output for obtaining wave filter with balance photodetector.
6. filtering method as claimed in claim 5, it is characterised in that according to tap number N and sample frequency T=β2ωrL is counted
Calculation obtains tap coefficient h (n) of the target filter；Wherein, β2It is the 2nd order chromatic 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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Cited By (2)
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| CN107328474A (en) * | 2017-05-22 | 2017-11-07 | 北京大学 | A kind of high resolution spectral measuring system based on frequency comb |
| 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 |
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| US20090297155A1 (en) * | 2006-08-11 | 2009-12-03 | Weiner Andrew M | Wideband microwave and millimeter wave filters using photonic spectral filtering |
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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 |
| 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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