CN111478176A - Waveform generating device and method based on semiconductor laser unit monocycle oscillation - Google Patents
Waveform generating device and method based on semiconductor laser unit monocycle oscillation Download PDFInfo
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- CN111478176A CN111478176A CN202010434314.8A CN202010434314A CN111478176A CN 111478176 A CN111478176 A CN 111478176A CN 202010434314 A CN202010434314 A CN 202010434314A CN 111478176 A CN111478176 A CN 111478176A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0085—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for modulating the output, i.e. the laser beam is modulated outside the laser cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0092—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/026—Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers
- H01S5/0265—Intensity modulators
Abstract
The invention discloses a waveform generating device and method based on single-period oscillation of a semiconductor laser, and belongs to the technical field of microwave photons. The output light of the main laser is simultaneously injected after being phase-modulated by a microwave signal source nExcited by slave laser nA single period oscillation state of the slave laser. The light injection intensity and the working current of the slave lasers are set so that the single-period oscillation frequency of each slave laser under the phase modulation optical sideband locking satisfies the harmonic frequency relation and has a stable phase relation, and therefore, Fourier synthesis can be realized. The power and the phase of each output optical signal from the laser in single-period oscillation are independently controlled, and a customized microwave arbitrary waveform signal can be obtained after photoelectric conversion. The invention does not need an optical frequency comb, has low cost and simple structure; complex filtering and frequency selection are not needed, the operation is easy, and the quality of generated signals is high; the frequency of the generated microwave arbitrary waveform signal is up to dozens of G Hz。
Description
Technical Field
The invention relates to the technical field of microwave photons, in particular to a waveform generating device and method based on single-period oscillation of a light injection semiconductor laser.
Background
the research personnel have not stopped the related research, the traditional microwave arbitrary waveform generation is realized in the electronics field based on direct digital frequency synthesis, is limited by the properties of electronic devices, the frequency and bandwidth of the generated arbitrary waveform signal are low, generally from hundreds of MHz to several GHz, along with the development of the photonics Technology, researchers start to use the photonics device to generate the arbitrary microwave waveform, thereby solving the limitations of the electronic devices in terms of frequency and bandwidth, for example, the scheme of generating the arbitrary waveform by carrying out root-to-root spectral individual control on a broadband spectrum signal by using a spatial light modulator or a programmable light processor (see [ Z.J.2006, D.E. L, origin, M.M.Weiner ], the scheme of generating the arbitrary waveform by using a large spectrum (see [ Z.J.E. L.E. and A.M.M.I., and W.G.E.E.E. L.E. and D.E.E.E.M.M.M.M.M.M.M.M.E. and W.E.E. A.A.A.A.A.A.A.A.A.A.A.A.A.A.A.A.A.A.A.A.A. is a novel scheme for generating a novel Optical waveform with a high-frequency and high-frequency wave-frequency by-wave-Optical comb (see a) and-wave-by-wave-by-wave-generating scheme (see the Optical comb-by-wave-by-wave-Optical comb-wave-generating scheme), and-wave-by-wave-generating scheme (see the other aspects), and-wave.
Disclosure of Invention
the invention provides a waveform generating device based on semiconductor laser unit single period oscillation, aiming at solving the problems of complex structure and low precision of optical domain filtering and shaping of the existing scheme based on an optical frequency comb and an optical filter, comprising a main laser, a phase modulator, a microwave signal source, a 1 × n optical coupler, n single period oscillation branches, an n x 1 optical coupler and a photoelectric detector, wherein the phase modulator is provided with an optical input end and a radio frequency input end;
the output end of the microwave signal source is connected with the radio frequency input end of the phase modulator;
the system comprises a 1 × n optical coupler, a n single-period oscillation branch, a photoelectric detector, a plurality of N single-period oscillation branches and a plurality of N single-period oscillation branches, wherein n is the number of branches, the 1 × n optical coupler is provided with an optical input end and n output ends, phase modulation optical signals are coupled into the n branches after passing through the 1 × n optical coupler and are respectively coupled into the n single-period oscillation branches from corresponding output ends;
Each of the n single-period oscillation branches comprises a first optical attenuator, an optical circulator, a slave laser, a second optical attenuator and an optical fiber phase shifter; the optical circulator is provided with an a port, a b port and a c port; the first optical attenuator, the optical circulator, the slave laser, the second optical attenuator and the optical fiber phase shifter are sequentially arranged on each branch along the light propagation direction;
in each branch, an optical signal passes through the main first optical attenuator, then is guided into the optical circulator through the port a of the optical circulator, is guided out from the port b of the optical circulator and is injected into the slave laser, the optical signal emitted by the slave laser is guided into the optical circulator through the port b of the optical circulator, the optical signal output by the port c of the optical circulator sequentially enters the second optical attenuator and the optical fiber phase shifter, and the output signal of the optical fiber phase shifter is connected to the corresponding input end of the n × 1 optical coupler.
Further, the slave laser is a single-mode distributed feedback semiconductor laser or a distributed Bragg reflector laser without an isolator at the output end.
further, the power in each branch of the 1 × n optical coupler and the n × 1 optical coupler is equally distributed.
The waveform generating method based on the single-period oscillation of the semiconductor laser comprises the following steps:
Step one, a main laser generates a continuous optical signal and inputs the continuous optical signal into a phase modulator, and a microwave signal source generates a frequency f mThe single-frequency microwave signal drives the phase modulator to obtain a phase modulated optical signal with high-order sidebands, and the frequency interval of each optical sideband is f mthe phase modulation optical signal is coupled into n single period oscillation branches through a 1 × n optical coupler, each branch comprises a first optical attenuator, an optical circulator, a slave laser, a second optical attenuator and an optical fiber phase shifter, and working currents of the first optical attenuator and the slave laser are arranged in the ith single period oscillation branch, so that the single period oscillation frequency of the slave laser is locked to if by the ith order modulation optical sideband of the phase modulation optical signal m(i＝1,2,3…n)。
Step two, setting a second optical attenuator and an optical fiber phase shifter in the ith single-period oscillation branch to control the power and the phase of an output optical signal from the laser single-period oscillation in the branch so as to control if to be subjected to photoelectric conversion mand the n × 1 optical coupler couples the n paths of optical signals output from the single-period oscillation of the laser and inputs the optical signals to a photoelectric detector to complete photoelectric conversion, so that the synthesis of the n paths of Fourier frequency components is realized, and a customized microwave arbitrary waveform signal is obtained.
Further, it is characterized in that: the slave laser in the ith branch works at the frequency if mInstead of injecting a locked state, the output from the laser is photo-electrically detected to generate a frequency if m1,2,3 … n.
The invention has the beneficial effects that: compared with the prior art, the waveform generating device and method based on the single-period oscillation of the semiconductor laser provided by the invention have the advantages of simple structure, low cost and easy control because the core device of the device is a commercial single-mode semiconductor laser without a high-speed electro-optical modulator, an optical frequency comb and an optical filter, and have the advantages of high frequency, large bandwidth and flexible tuning because the semiconductor laser works in a single-period oscillation state.
Drawings
FIG. 1 is a schematic diagram of a waveform generating device based on single-period oscillation of a semiconductor laser;
FIG. 2 is a schematic diagram of the optical spectrum and the electrical spectrum of a triangular wave for generating microwaves;
Fig. 3 is a schematic diagram of a generated microwave triangular wave signal.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
the invention discloses a waveform generating device based on semiconductor laser unit single period oscillation, and figure 1 is a schematic diagram of the waveform generating device based on semiconductor laser unit single period oscillation, which comprises a main laser, a phase modulator, a microwave signal source, a 1 × n optical coupler, n single period oscillation branches, an NX1 optical coupler and a photoelectric detector, wherein the phase modulator is provided with an optical input end and a radio frequency input end;
the output end of the microwave signal source is connected with the radio frequency input end of the phase modulator;
the system comprises a 1 × n optical coupler, a n single-period oscillation branch, a photoelectric detector, a plurality of N single-period oscillation branches and a plurality of N single-period oscillation branches, wherein n is the number of branches, the 1 × n optical coupler is provided with an optical input end and n output ends, phase modulation optical signals are coupled into the n branches after passing through the 1 × n optical coupler and are respectively coupled into the n single-period oscillation branches from corresponding output ends;
Each of the n single-period oscillation branches comprises a first optical attenuator, an optical circulator, a slave laser, a second optical attenuator and an optical fiber phase shifter; the optical circulator is provided with an a port, a b port and a c port; the first optical attenuator, the optical circulator, the slave laser, the second optical attenuator and the optical fiber phase shifter are sequentially arranged on each branch along the light propagation direction;
in each branch, an optical signal passes through the main first optical attenuator, then is guided into the optical circulator through the port a of the optical circulator, is guided out from the port b of the optical circulator and is injected into the slave laser, the optical signal emitted by the slave laser is guided into the optical circulator through the port b of the optical circulator, the optical signal output by the port c of the optical circulator sequentially enters the second optical attenuator and the optical fiber phase shifter, and the output signal of the optical fiber phase shifter is connected to the corresponding input end of the n × 1 optical coupler.
Fig. 1 is a schematic diagram showing the connection relationship between the technical features of the device according to the present embodiment, and the shape of each component in fig. 1 is only illustrative and is not limited to the shape and structure.
The invention relates to a waveform generating device and method based on semiconductor laser unit single period oscillation, which has the following specific working principle:
The invention is mainly based on the single-period oscillation nonlinear dynamic state of a light injection semiconductor laser. A periodic waveform having an arbitrary waveform shape can be fourier series expanded, i.e., contains a fundamental sine (cosine) wave component and a series of harmonic components. Therefore, a desired microwave waveform signal can be produced by generating and synthesizing microwave signals corresponding to the sine (cosine) wave component and the harmonic component of the fundamental frequency in the time domain. According to the invention, one master laser is injected into n slave lasers at the same time, so that the n slave lasers all work in a single-period oscillation state, and the corresponding single-period oscillation frequency meets the harmonic frequency relation; the output light of the master laser is subjected to phase modulation, and the generated high-order phase modulation optical sidebands sequentially lock the single-period oscillation optical signals of the slave lasers; the single-period oscillation optical signals output from the lasers are subjected to beat frequency by the photoelectric detectors to generate single-frequency microwave signals corresponding to Fourier frequencies and are synthesized; and controlling the optical attenuators and the optical fiber phase shifters of all branches according to the required microwave arbitrary waveform signals, so as to control the power and the phase of the output optical signals, namely the Fourier frequency components to be subjected to photoelectric conversion, from the laser single-period oscillation, and obtain the microwave arbitrary waveform generation.
The invention relates to a waveform generation method based on semiconductor laser unit single period oscillation, which comprises the following specific steps:
Step one, a main laser generates a continuous optical signal and inputs the continuous optical signal into a phase modulator, and a microwave signal source generates a frequency f mThe single-frequency microwave signal drives the phase modulator to obtain a phase modulated optical signal with high-order sidebands, and the frequency interval of each optical sideband is f mthe phase modulation optical signal is coupled into n single period oscillation branches through a 1 × n optical coupler, each branch comprises a first optical attenuator, an optical circulator, a slave laser, a second optical attenuator and an optical fiber phase shifter, and working currents of the first optical attenuator and the slave laser are arranged in the ith single period oscillation branch, so that the single period oscillation frequency of the slave laser is locked to if by the ith order modulation optical sideband of the phase modulation optical signal m(i＝1,2,3…n)。
Step two, setting a second optical attenuator and an optical fiber phase shifter in the ith single-period oscillation branch to control the power and the phase of an output optical signal from the laser single-period oscillation in the branch so as to control if to be subjected to photoelectric conversion mand the n × 1 optical coupler couples the n paths of optical signals output from the single-period oscillation of the laser and inputs the optical signals to a photoelectric detector to complete photoelectric conversion, so that the synthesis of the n paths of Fourier frequency components is realized, and a customized microwave arbitrary waveform signal is obtained.
Further, it is characterized in that: the slave laser in the ith branch works at the frequency if mInstead of injecting a locked state, the output from the laser is photo-electrically detected to generate a frequency if mIs equal to 1,2,3 …n)。
In order to facilitate understanding of the technical solution of the present invention, the following describes the principle of the above-mentioned apparatus by taking the generation of a microwave triangular waveform as an example:
The periodic triangular wave f (t) can be represented by a superimposed Fourier series as:
Where A and ω are the amplitude and frequency of f (t), respectively. It can be seen that the triangular wave f (t) contains mainly harmonic components in the frequency domain equal to 1, 3, 5 times the repetition frequency f ═ ω/2 pi, where frequency components above the 5 th harmonic can be ignored due to the smaller amplitude. Therefore, the 1 st, 3 rd and 5 th harmonic components having stable phase relationships generated from the single-period oscillation of the laser in the present invention can be synthesized to generate a microwave triangular waveform. FIG. 2 is a schematic diagram of the optical spectrum and the electrical spectrum of a triangular microwave wave generated by the apparatus and the method of the present invention: the first row is a schematic of the optical and electrical spectra of the generated 1 st harmonic, the second row is a schematic of the optical and electrical spectra of the generated 3 rd harmonic, and the third row is a schematic of the optical and electrical spectra of the generated 5 th harmonic; the ith harmonic has an optical spectrum that includes two major optical frequency components f MLAnd f ML-ifmWherein f is MLIs a regenerated main laser frequency component, f MLThe components carry high order phase modulation sidebands with a frequency separation f between the sidebands m(ii) a Under i-order phase modulation sideband locking, f MLAnd f ML-ifmTwo optical frequency components beat frequency generation frequency if m1,3, 5. Each slave laser outputs a harmonic wave in the Fourier series expansion correspondingly in the single-period oscillation state, and the corresponding optical attenuator and the optical fiber phase shifter are adjusted according to the amplitude and the phase of each Fourier frequency in the Fourier transform formula of the triangular wave, so that a microwave triangular wave waveform signal is generated at the output end of the photoelectric detector. Fig. 3 is a schematic diagram of a microwave triangular waveform generated based on the present invention.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and it should be understood that any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A waveform generating device based on semiconductor laser unit monocycle oscillation is characterized by comprising a master laser, a phase modulator, a microwave signal source and 1 ″ nAn optical coupler, nA single-period oscillation branch, n1' optical coupler and photodetector; the phase modulator is provided with an optical input end and a radio frequency input end; the photoelectric detector is provided with an input end and an output end;
Output end of main laser, optical input end of phase modulator, 1 ″ nThe input ends of the optical couplers are sequentially connected, and the output end of the microwave signal source is connected with the radio frequency input end of the phase modulator;
Wherein n1' for the number of branches nThe optical coupler is provided with an optical input end and nAn output end, through which the phase-modulated optical signal passes through 1 ″ nThe optical coupler is then coupled into nEach branch being coupled in from a corresponding output terminal nA single periodic oscillation branch; the above-mentioned nThe' 1 optical coupler is provided with nAn input terminal and an output terminal, wherein, nThe single periodic oscillation branches are respectively coupled in from corresponding ports nThe '1 optical coupler is led out from the output end of the' 1 optical coupler; nThe output end of the' 1 optical coupler is connected with the input end of a photoelectric detector, and a microwave arbitrary waveform signal is led out from the output end of the photoelectric detector;
Said nEach single-period oscillation branch comprises a first optical attenuator, an optical circulator, a slave laser, a second optical attenuator and an optical fiber phase shifter; the optical circulator is provided with an a port, a b port and a c port; on each branch, the first one is arranged in turn along the light propagation direction A Optical attenuator, optical circulator, slave laser, and slave laser II Optical attenuator, optical fiber phase shifter;
In each branch, the optical signal passes through the first optical attenuator and then is guided into the optical loop through the a port of the optical circulator The optical signal emitted from the laser is led into the optical circulator through the b port of the optical circulator, and the optical signal output from the c port of the optical circulator enters the second optical attenuator and the optical fiber phase shifter in sequence; the output of the fiber phase shifter is connected to nThe '1 optical coupler's corresponding input.
2. The waveform generation apparatus based on the monocycle oscillation of a semiconductor laser as set forth in claim 1, wherein: the slave laser is a single-mode distributed feedback semiconductor laser or a distributed Bragg reflection laser without an isolator at the output end.
3. The waveform generation apparatus based on the monocycle oscillation of a semiconductor laser as set forth in claim 1, wherein: 1' described nOptical coupler and nThe power is equally distributed among the various branches of the' 1 optical coupler.
4. A waveform generating method based on the monocycle oscillation of a semiconductor laser, characterized in that a microwave arbitrary waveform is generated using the waveform generating apparatus based on the monocycle oscillation of a semiconductor laser according to claim 1, comprising the steps of:
Step one, the main laser generates continuous optical signals to be input into a phase modulator, and a microwave signal source generates a frequency of f mThe single-frequency microwave signal drives the phase modulator to obtain a phase modulated optical signal with high-order sidebands, and the frequency interval of each optical sideband is f m(ii) a The phase modulated optical signal is subjected to 1 ″ nThe optical coupler is coupled into nEach single-period oscillation branch comprises a first optical attenuator, an optical circulator, a slave laser, a second optical attenuator and an optical fiber phase shifter; in the first place iIn the monocycle oscillation branch, the first optical attenuator and the working current of the slave laser are set so that the monocycle oscillation frequency of the slave laser is phase-modulated iOrder modulated optical sideband locking if m(i=1, 2, 3…n)。
5. Step two, setting up iThe second optical attenuator and optical fiber phase shifter in the monocycle oscillation branch circuit control the power and phase of the output optical signal from the laser monocycle oscillation in the branch circuit to control the optical-to-electrical conversion if mFourier frequency component ( i=1, 2, 3…n) (ii) a The above-mentioned nThe' 1 optical coupler couples this nThe optical signal output by the single-period oscillation of the laser is coupled and then input to the photoelectric detector to complete photoelectric conversion, so that the realization of the photoelectric conversion nAnd synthesizing the Fourier frequency components to obtain the customized microwave arbitrary waveform signal.
6. The method for generating a waveform based on monocycle oscillation of a semiconductor laser as set forth in claim 4, wherein: the first mentioned iIn the branch from the laser operating at a frequency of if mIs in a single-cycle oscillation state, other than the injection-locked state, in which the output from the laser is photodetection to produce a frequency of if mMicrowave signal of (a) i=1, 2, 3…n)。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253286A (en) * | 2021-07-07 | 2021-08-13 | 之江实验室 | Coherent microwave photon radar detection method and system based on injection locking frequency multiplication |
| CN114614902A (en) * | 2022-03-08 | 2022-06-10 | 南京航空航天大学 | All-optical reconfigurable microwave signal generation method and device |
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2020
- 2020-05-21 CN CN202010434314.8A patent/CN111478176A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253286A (en) * | 2021-07-07 | 2021-08-13 | 之江实验室 | Coherent microwave photon radar detection method and system based on injection locking frequency multiplication |
| CN113253286B (en) * | 2021-07-07 | 2021-10-29 | 之江实验室 | Coherent microwave photon radar detection method and system based on injection locking frequency multiplication |
| CN114614902A (en) * | 2022-03-08 | 2022-06-10 | 南京航空航天大学 | All-optical reconfigurable microwave signal generation method and device |
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