CN108880688A - A kind of dual wavelength ultrashort light pulse source based on external modulation technology - Google Patents
A kind of dual wavelength ultrashort light pulse source based on external modulation technology Download PDFInfo
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- CN108880688A CN108880688A CN201710328094.9A CN201710328094A CN108880688A CN 108880688 A CN108880688 A CN 108880688A CN 201710328094 A CN201710328094 A CN 201710328094A CN 108880688 A CN108880688 A CN 108880688A
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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
- H04B10/50—Transmitters
- H04B10/508—Pulse generation, e.g. generation of solitons
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
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Abstract
The invention discloses a kind of dual wavelength ultrashort light pulse source based on external modulation technology, including：Laser（1）, phase-modulator A（2）, microwave source（3）,1：1 electric power splitter（4）, light wavelength division multiplexing（5）, optical band pass filter A（6）, optical band pass filter B（7）, optical delay line（8）, photo-coupler（9）, phase-modulator B（10）, phase shifter（11）With dispersion compensation medium；The microwave source（3）With 1：1 electric power splitter（4）Connection；1：1 electric power splitter（4）There are two output port, one of output port and phase-modulator A（2）Microwave input port connection, another output mouth and phase shifter（11）Connection；Phase shifter（11）Output port and phase-modulator B（10）Microwave input port connection.The present invention is non-interfering type structure and avoids dc shift influence in traditional scheme, has excellent environmental suitability.
Description
Technical field
The present invention relates to a kind of ultrashort light pulse source, especially a kind of dual wavelength ultrashort light pulse based on external modulation technology
Source.
Background technique
There is important application in ultrashort light pulse source in military communication, detection and many civil fields.Common ultrashort laser
There are mainly three types of clock generation schemes, they are based primarily upon mode-locked laser, gain switch laser and direct current light and are transferred
Technology processed.Wherein, mode-locked laser can produce the ultrashort light pulse with low phase noise and nearly transform limit.But
It is phenomena such as such scheme uses cavity resonator structure, therefore the factors such as extraneous vibration and temperature will lead to mode hopping or even losing lock, says
It is bright it job stability and environmental suitability it is poor.It is fixed further, since chamber is long, the pulse recurrence frequency of the program, center
Wavelength and duty ratio are all difficult to tune, and are unfavorable for practical application.Gain switch laser similarly faces the above problem.And base
It can solve the above problem in the ultrashort light pulse source scheme of direct current light external modulation technology.Arteries and veins based on direct current light external modulation technology
The source scheme of punching mainly directly modulates direct current light using electrooptic modulator, to obtain ultrashort light pulse output.In such side
In case, electrooptic modulator is driven by external microwave signal, can be believed by working condition, the external microwave of tuning electrooptic modulator
The power and frequency of number driving signal flexibly to tune the duty ratio and repetition rate of ultrashort light pulse.And such scheme is without humorous
Resonator structure, thus be not present mode hopping or losing lock phenomena such as, environmental suitability is stronger.Therefore, it is based on direct current light external modulation technology
Light impulse source generate very big favor of the scheme by people.But external modulation scheme reported at present mostly uses electric absorption tune
Device processed, Mach-Zehnder intensity modulator, light polarization modulator etc. are used as external modulator.Wherein, electroabsorption modulator insertion loss
Influence big and susceptible to static electricity；The DC offset voltage of Mach-Zehnder intensity modulator can be changed by extraneous factor to be generated partially
It moves；Light polarization modulator belongs to performance of interferometric modulators, therefore is also easy to be influenced by external environment.In addition, for a direct current light
Input, above-mentioned light impulse source scheme can only generate an output pulse, that is, are unable to multi-wavelength output and duty is bigger（It is greater than
25%）, therefore uneconomical also it is unfavorable for practical application.
Summary of the invention
It is an object of that present invention to provide a kind of non-interfering type ultrashort light pulse of the dual wavelength based on external modulation technology sources, solve
The problem of electrostatic sensitive present in prior art, duty ratio are high, environmental suitability is poor and is difficult to twin wavelength laser output.
A kind of dual wavelength ultrashort light pulse source based on external modulation technology, including：Laser, phase-modulator A, microwave
Source, 1：1 electric power splitter, light wavelength division multiplexing, optical band pass filter A, optical band pass filter B, optical delay line, photo-coupler, phase
Position modulator B, phase shifter and single mode optical fiber.
The microwave source and 1：1 electric power splitter connection；1：There are two output port, one of output ends for 1 electric power splitter
Mouth is connect with the microwave input port of phase-modulator A, and another output mouth is connect with phase shifter；The output port of phase shifter
It is connect with the microwave input port of phase-modulator B.
The laser is connect with the light input port of phase-modulator A；The optical output port and light wave of phase-modulator A
The input port of division multiplexer connects；There are two output port, one of output port and the logical filters of light belt for light wavelength division multiplexing
The input port of wave device A connects, and another output mouth is connect with the input port of optical band pass filter B；Optical band pass filter B
Output port and optical delay line input port connect.
The photo-coupler includes two input ports, the output end of one of input port and optical band pass filter A
The output port of mouth connection, another input port and optical delay line connects；The output port and phase-modulator B of photo-coupler
Light input port connection；The optical output port of phase-modulator B is connect with single mode optical fiber.
The phase-modulator A, light wavelength division multiplexing, optical band pass filter A, optical band pass filter B collectively form this pair
The pulse clipper part in wavelength ultrashort light pulse source.When system works, the sinusoidal signal of microwave source output passes through 1：1 electric work point
After device, it is divided into identical two paths of signals：Phase-modulator A is directly driven all the way；Another way drives phase after phase shifter phase shift
Position modulator B.
Laser issue central wavelength beλDirect current light be phase-modulated device A modulation, generate at any time periodically become
Change and have the positive chirp and negative chirp of symmetry.This illustrate it is phase modulated after the instantaneous frequency of direct current light will at any time
Cyclically-varying is done, i.e., the direct current light spectrum after phase-modulation will be with former central wavelengthλIt is broadened for symmetrical centre, forms exhibition
Wide spectrum.
By deviating the narrowband Gaussian type optical band pass filter in stretched-out spectrum different location, instantaneous centre in time domain is filtered out
Frequency and part corresponding in stretched-out spectrum form Gaussian seed pulse of the duty ratio less than 20%.Due to stretched-out spectrum with
Direct current center wavelength of lightλSymmetrically, therefore by Gaussian optical band pass filter A and optical band pass filter B it is biased in broadening light respectively
Compose symmetrical centreλThe right and left to get to two-way have different central wavelengths Gaussian seed pulse, to realize double wave
Long output.For the duty ratio for further decreasing seed pulse, need to compress the pulse width of seed pulse.For this purpose, will
Obtained two-way seed pulse is coupled as being input to subsequent pulse shortener all the way by photo-coupler.In the process, lead to
Overregulating optical delay line keeps the pulse peak of two-way seed pulse synchronous.
Pulse shortener is formed using phase-modulator B and single mode optical fiber, to the seed pulse generated by pulse clipper
It is compressed.After the Gaussian seed pulse with smaller duty ratio injects phase-modulator B, the phase of Gaussian seed pulse
Position will be phase-modulated device B modulation.By tuning the phase of phase shifter, the phase change near seed pulse peak is presented approximate
The shape of quadratic function, this illustrates that approximately linear variation will be nearby presented in the modulated seed pulse peak phase modulated device B
Positive chirp, and negative chirp and non-linear chirp are then distributed near pulse substrate, i.e., negative chirp and non-linear chirp are by pulse base
Bottom inhibits.So carrying out dispersion compensation compression using single mode optical fiber, ultrashort pulse is formed, while being not in apparent pedestal.
Therefore the two-way seed pulse generated by pulse clipper is coupled together after optical delay line synchronizes by photo-coupler, is infused
Enter into phase-modulator B.The phase of phase shifter is adjusted, so that approximate secondary letter is nearby presented in the seed pulse peak of two wavelength
Then the phase of number form compress without pedestal using seed pulse of the single mode optical fiber to two wavelength, to obtain two waves
Long ultrashort light pulse output.
Without external dc biasing when phase-modulator used in the present invention is non-interfering type modulator and works, therefore
Have the characteristics that compact-sized, environmental suitability is strong and insensitive to electrostatic.In addition, compared with prior art, the present invention can
It generates the number of channel and is twice of number of input direct-current light of low duty ratio light pulse, thus be suitable for requiring low duty ratio, multi-wavelength
The operating mode of output.
Detailed description of the invention
A kind of dual wavelength ultrashort light pulse source schematic diagram based on external modulation technology of Fig. 1.
1. 2. phase-modulator A of laser, 3. microwave source 4. 1：1 5. light wavelength division multiplexing of electric power splitter；
6. 7. optical band pass filter B of optical band pass filter A, 8. optical delay line, 9. photo-coupler；
10. 11. phase shifter of phase-modulator B, 12. single mode optical fiber.
Specific embodiment
Laser 1 issue central wavelength beλDirect current light be phase-modulated device A2 modulation, generate at any time periodically become
Change and have the positive chirp and negative chirp of symmetry.This illustrate it is phase modulated after the instantaneous frequency of direct current light will at any time
Cyclically-varying is done, i.e., modulated direct current light spectrum will be with former central wavelengthλIt is broadened for symmetrical centre, forms broadening light
Spectrum.The stretched-out spectrum obtained after phase modulated is divided by wave crest multiplexer 5 for two-way road, is separately input to optical band pass filter A6
With optical band pass filter B7.Optical band pass filter A6 and optical band pass filter B7 is biased in the right and left of stretched-out spectrum respectively,
Obtain the two-way seed pulse with different central wavelengths.
The two-way seed pulse of generation is coupled together by photo-coupler 9 after optical delay line 8 synchronizes, is injected into phase
In modulator B10.The phase of phase shifter 11 is adjusted, so that approximation two is nearby presented in the seed pulse peak of two different central wavelengths
Secondary shape phase simultaneously can carry out without pedestal pressure the seed pulse of two different central wavelengths by single mode optical fiber 12 in this way
Contracting, to obtain the ultrashort light pulse output of two different central wavelengths.
A kind of dual wavelength ultrashort light pulse source based on external modulation technology, including：Laser 1, phase-modulator A2, microwave
Source 3,1：1 electric power splitter 4, light wavelength division multiplexing 5, optical band pass filter A6, optical band pass filter B7, optical delay line 8, optical coupling
Device 9, phase-modulator B10, phase shifter 11 and single mode optical fiber 12.
The microwave source 3 and 1：1 electric power splitter 4 connects；1：There are two output port, one of outputs for 1 electric power splitter 4
Port is connect with the microwave input port of phase-modulator A2, and another output mouth is connect with phase shifter 11；Phase shifter 11
Output port is connect with the microwave input port of phase-modulator B10.
The laser 1 is connect with the light input port of phase-modulator A2；The optical output port of phase-modulator A2 with
The input port of light wavelength division multiplexing 5 connects；There are two output port, one of output port and light for light wavelength division multiplexing 5
The input port of bandpass filter A6 connects, and another output mouth is connect with the input port of optical band pass filter B7；Light belt
The output port of bandpass filter B7 is connect with the input port of optical delay line 8.
The photo-coupler 9 includes two input ports, the output of one of input port and optical band pass filter A6
Port connection, another input port are connect with the output port of optical delay line 8；The output port and phase tune of photo-coupler 9
The light input port of device B10 processed connects；The optical output port of phase-modulator B10 is connect with single mode optical fiber 12.
The phase-modulator A2, light wavelength division multiplexing 5, optical band pass filter A6, optical band pass filter B7 are collectively formed
The pulse clipper part in the dual wavelength ultrashort light pulse source.When system works, the sinusoidal signal that microwave source 3 exports passes through 1：1
After electric power splitter 4, it is divided into identical two paths of signals：Phase-modulator A2 is directly driven all the way；Another way is moved by phase shifter 11
Phase-modulator B10 is driven after phase.
Laser 1 issue central wavelength beλDirect current light be phase-modulated device A2 modulation, generate at any time periodically become
Change and have the positive chirp and negative chirp of symmetry.This illustrate it is phase modulated after the instantaneous frequency of direct current light will at any time
Cyclically-varying is done, i.e., the direct current light spectrum after phase-modulation will be with former central wavelengthλIt is broadened for symmetrical centre, forms exhibition
Wide spectrum.
By deviating the narrowband Gaussian type optical band pass filter in stretched-out spectrum different location, instantaneous centre in time domain is filtered out
Frequency and part corresponding in stretched-out spectrum form Gaussian seed pulse of the duty ratio less than 20%.Due to stretched-out spectrum with
Direct current center wavelength of lightλSymmetrically, therefore by Gaussian optical band pass filter A6 and optical band pass filter B7 it is biased in broadening respectively
Spectrum symmetrical centreλThe right and left to get the Gaussian seed pulse to two-way with different central wavelengths, to realize double
Wavelength output.For the duty ratio for further decreasing seed pulse, need to compress the pulse width of seed pulse.For this purpose,
Obtained two-way seed pulse is coupled as being input to subsequent pulse shortener all the way by photo-coupler 9.In this process
In, keep the pulse peak of two-way seed pulse synchronous by adjusting optical delay line 8.
The phase-modulator B10 and single mode optical fiber 12 form pulse shortener, to the seed generated by pulse clipper
Pulse is compressed.After the Gaussian seed pulse with smaller duty ratio injects phase-modulator B10, Gaussian seed arteries and veins
The phase of punching will be phase-modulated device B10 modulation.By adjusting the phase of phase shifter 11, become the phase near seed pulse peak
Change the shape that approximate quadratic function is presented, this illustrates to present near the phase modulated modulated seed pulse peak device B10 close
Like the positive chirp of linear change, and negative chirp and non-linear chirp are then distributed near pulse substrate, i.e., negative chirp and non-linear
Chirp is inhibited by pulse substrate.So carrying out dispersion compensation compression using single mode optical fiber 12, ultrashort pulse is formed, while will not go out
Now apparent pedestal.Therefore the two-way seed pulse generated by pulse clipper is after optical delay line 8 synchronizes, by photo-coupler
9 are coupled together, and are injected into phase-modulator B10.The phase for adjusting phase shifter 11, so that the seed pulse peak of two wavelength
The phase of approximate quadratic function shape is nearby presented, is then carried out using seed pulse of the single mode optical fiber 12 to two wavelength without pedestal
Compression, to obtain the ultrashort light pulse output of two wavelength.
Claims (3)
1. a kind of dual wavelength ultrashort light pulse source based on external modulation technology, including：Laser（1）, phase-modulator A（2）, it is micro-
Wave source（3）,1：1 electric power splitter（4）, light wavelength division multiplexing（5）, optical band pass filter A（6）, optical band pass filter B（7）, light prolongs
When line（8）, photo-coupler（9）, phase-modulator B（10）, phase shifter（11）With dispersion compensation medium；
The microwave source（3）With 1：1 electric power splitter（4）Connection；1：1 electric power splitter（4）There are two output ports, one of them is defeated
Exit port and phase-modulator A（2）Microwave input port connection, another output mouth and phase shifter（11）Connection；Phase shift
Device（11）Output port and phase-modulator B（10）Microwave input port connection；
The laser（1）With phase-modulator A（2）Light input port connection；Phase-modulator A（2）Optical output port
With light wavelength division multiplexing（5）Input port connection；Light wavelength division multiplexing（5）There are two output port, one of output ends
Mouth and optical band pass filter A（6）Input port connection, another output mouth and optical band pass filter B（7）Input port
Connection；Optical band pass filter B（7）Output port and optical delay line（8）Input port connection；The photo-coupler（9）Packet
Containing two input ports, one of input port and optical band pass filter A（6）Output port connection, another input terminal
Mouth and optical delay line（8）Output port connection；Photo-coupler（9）Output port and phase-modulator B（10）Light input
Port connection；Phase-modulator B（10）Optical output port connect with dispersion compensation medium；
The phase-modulator A（2）, light wavelength division multiplexing（5）, optical band pass filter A（6）, optical band pass filter B（7）Jointly
Constitute the pulse clipper in the dual wavelength ultrashort light pulse source；The phase-modulator B（10）Constituting with dispersion compensation medium should
The pulse shortener in dual wavelength ultrashort light pulse source；
When system works, microwave source（3）The sinusoidal signal of output passes through 1：1 electric power splitter（4）Afterwards, it is divided into identical two-way letter
Number：Phase-modulator A is directly driven all the way（2）；Another way passes through phase shifter（11）Phase-modulator B is driven after phase shift（10）；
Laser（1）The central wavelength of sending isλDirect current light be phase-modulated device A（2）Modulation, generate at any time cyclically-varying,
And positive chirp and negative chirp with symmetry；The cyclically-varying at any time of the instantaneous frequency of direct current light after phase modulated,
Direct current light spectrum i.e. after phase-modulation is with former central wavelengthλIt is broadened for symmetrical centre, forms stretched-out spectrum；
By deviating the narrowband Gaussian type optical band pass filter in stretched-out spectrum different location, instantaneous centre frequency in time domain is filtered out
Part corresponding with stretched-out spectrum forms Gaussian seed pulse of the duty ratio less than 20%；Since stretched-out spectrum is with direct current
Center wavelength of lightλSymmetrically, therefore by Gaussian optical band pass filter A（6）With optical band pass filter B（7）It is biased in broadening respectively
Spectrum symmetrical centreλThe right and left to get to two-way have different central wavelengths Gaussian seed pulse, realize dual wavelength
Output；
The phase-modulator B（10）The pulse shortener in the dual wavelength ultrashort light pulse source is constituted with dispersion compensation medium；Arteries and veins
Rushing compressor there is the Gaussian seed pulse of different central wavelengths to compress the two-way generated by pulse clipper；Work as arteries and veins
It is punched the two-way seed pulse that cutter generates and passes through optical delay line（8）After synchronizing, by photo-coupler（9）It is coupled together, injects
To phase-modulator B（10）In, the phase of Gaussian seed pulse is phase-modulated device B（10）Modulation；By adjusting phase shifter
（11）Phase, make phase change near the seed pulse peak of two wavelength that the shape of approximate quadratic function be presented, it is then sharp
Dispersion compensation compression is carried out with seed pulse peak of the dispersion compensation medium to two wavelength, forms the super without pedestal of two wavelength
Short optical pulse output.
2. the dual wavelength ultrashort light pulse source based on external modulation technology as described in claim 1, it is characterised in that the dispersion
Compensation medium is single mode optical fiber（12）.
3. the dual wavelength ultrashort light pulse source based on external modulation technology as claimed in claim 1 or 2, it is characterised in that the phase
Position modulator A（2）With phase-modulator B（10）For non-interfering type modulator.
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