CN107689834A - Wave generator system and method based on time domain frequency domain mapping - Google Patents
Wave generator system and method based on time domain frequency domain mapping Download PDFInfo
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Abstract
Present disclose provides a kind of wave generator system based on time domain frequency domain mapping, including：Laser, the sweeping laser for output wavelength with time consecutive variations；Frequency spectrum shaping module, its input are connected with the output end of laser, and shaping is carried out for receiving frequency-sweeping laser and to it；And photodetector, its input are connected with the output end of frequency spectrum shaping module, the optical signal for frequency spectrum shaping module to be exported is converted into electric signal.The disclosure additionally provides a kind of Waveform generating method based on time domain frequency domain mapping.The wave generator system and method based on time domain frequency domain mapping that the disclosure provides, the characteristics of there is low-loss, simple in construction, restructural and be easily integrated.
Description
Technical Field
The disclosure belongs to the technical field of microwave photonics, and particularly relates to a waveform generation system and method based on frequency domain-time domain mapping.
Background
Microwave/millimeter wave signal sources with ultra-low phase noise and large frequency tunable range have wide application in radar, wireless communication, inter-satellite link, modern measurement and other fields. The phase noise performance affects the quality of the received signal and the error rate of the microwave digital communication system, and therefore, a microwave signal source with low phase noise, a large operable frequency range and a high frequency tunability is very critical in practical applications.
The traditional electronic method is limited by the bandwidth of the device, so that the carrier frequency and the bandwidth of the generated broadband signal are very limited, and the photonics has the advantage of large bandwidth, so that the generation of the broadband microwave signal by utilizing the photonics attracts people's attention. Methods for generating broadband signals by photonics mainly include four types: direct space-time pulse shaping, spectral shaping and frequency-time mapping based methods, time domain pulse shaping, and photonic microwave delay line based filtering. At present, the chirp microwave signal is mostly generated by adopting a method based on frequency spectrum shaping and frequency time domain mapping. The system for generating the arbitrary waveform based on the spectrum shaping and the frequency-time domain mapping comprises a spectrum constructor and a dispersion device, wherein the spectrum constructor is used for performing the spectrum shaping on the input ultrashort pulse, and the dispersion device is used for completing the mapping from the optical signal frequency domain to the time domain. The optical pulse after spectral shaping and time domain broadening is input into a high-speed photoelectric detector to realize photoelectric conversion, and then a time domain microwave signal with the same shape as the signal spectrum is generated at the output end of the system. The method for generating any waveform proposed by the pulse shaping based on the technology needs to be obtained through frequency domain-time domain mapping introduced by a dispersion medium, so that the loss and complexity of the system are increased, the application of the traditional dispersion device is limited because the fiber dispersion is greatly influenced by the environment such as temperature, and the like, and once the other dispersion medium Bragg fiber grating is designed, the dispersion coefficient cannot be changed, so that the tunability of the system is limited.
Disclosure of Invention
Technical problem to be solved
In view of the above technical problems, the present disclosure provides a waveform generation system and method based on frequency domain-time domain mapping, which have the characteristics of low loss, simple structure, reconfigurability, and easy integration.
(II) technical scheme
According to an aspect of the present disclosure, there is provided a waveform generation system based on frequency domain-time domain mapping, including: the laser is used for outputting sweep-frequency laser with the wavelength continuously changing along with time; the input end of the frequency spectrum shaping module is connected with the output end of the laser and is used for receiving and shaping the swept-frequency laser; and the input end of the photoelectric detector is connected with the output end of the spectrum shaping module and is used for converting the optical signal output by the spectrum shaping module into an electric signal.
In some embodiments of the present disclosure, the swept laser is spectrally shaped by a spectral shaping module to change a time-domain waveform of the swept laser.
In some embodiments of the present disclosure, tuning of the photodetector output electrical signal is achieved by adjusting and controlling the wavelength scanning range, the frequency sweeping rate, or the operating parameters of the spectral shaping module of the laser.
In some embodiments of the present disclosure, the laser and the spectral shaping module, and the spectral shaping module and the photodetector are connected by using optical fibers.
In some embodiments of the present disclosure, the operating wavelength range of the spectral shaping module is within the wavelength scan range of the laser.
In some embodiments of the present disclosure, the laser is a fourier domain mode-locked swept laser, a distributed feedback laser, a distributed bragg reflector laser, or a vertical cavity surface emitting laser.
In some embodiments of the present disclosure, the spectral shaping module is a programmable waveform shaper or a grating.
According to another aspect of the present disclosure, there is provided a waveform generation method based on frequency domain-time domain mapping, including: the laser outputs sweep-frequency laser with wavelength continuously changing along with time; the frequency spectrum shaping module is used for carrying out frequency spectrum shaping on the swept laser; and the photoelectric detector converts the optical signal after the frequency spectrum shaping into an electric signal.
In some embodiments of the present disclosure, in the step of performing spectrum shaping on the swept-frequency laser by the spectrum shaping module, the swept-frequency laser is subjected to spectrum shaping by the spectrum shaping module, so as to change a time-domain waveform of the swept-frequency laser.
In some embodiments of the present disclosure, tuning the photodetector output electrical signal is achieved by changing the wavelength sweep range, sweep rate, or operating parameters of the spectral shaping module of the laser.
(III) advantageous effects
It can be seen from the above technical solutions that the waveform generation system and method based on frequency domain-time domain mapping according to the present disclosure have at least one of the following beneficial effects:
(1) according to the method, the characteristic that the wavelength of the sweep frequency laser output by the laser continuously changes along with time is utilized, the spectral shaping module is used for carrying out spectral shaping on an optical signal output by the laser, the time domain waveform of the sweep frequency laser can be directly changed without a dispersion medium, namely, the mapping of the sweep frequency laser on the time domain is realized, the complexity and the loss of a system are reduced, and the integration is easy;
(2) the frequency of the electric signal output by the photoelectric detector can be tuned by changing the wavelength scanning range, the frequency sweeping speed or the working parameters of the frequency spectrum shaping module of the laser;
(3) the frequency domain waveform of the output optical signal of the laser is designed through the frequency spectrum shaping module, and the generation of any waveform can be realized.
Drawings
Fig. 1 is a schematic structural diagram of a waveform generation system based on frequency domain-time domain mapping according to the present disclosure.
Fig. 2a is a frequency domain waveform diagram of the output optical signal of the fourier domain mode-locked swept laser in this embodiment.
Fig. 2b is a time-domain waveform diagram of the output optical signal of the fourier-domain mode-locked swept laser in this embodiment.
Fig. 3a is a frequency domain waveform diagram of the optical signal after the spectral shaping in this embodiment.
Fig. 3b is a time domain waveform diagram of the optical signal after the spectral shaping in this embodiment.
Fig. 4 is a time domain waveform diagram of an output signal after passing through a photodetector in this embodiment.
[ Main element ]
1, a laser; 2, a spectrum shaping module; 3 photo detector.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It should be noted that in the drawings or description, the same drawing reference numerals are used for similar or identical parts. Implementations not depicted or described in the drawings are of a form known to those of ordinary skill in the art. Additionally, while exemplifications of parameters including particular values may be provided herein, it is to be understood that the parameters need not be exactly equal to the respective values, but may be approximated to the respective values within acceptable error margins or design constraints. Directional phrases used in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., refer only to the direction of the attached drawings and are not intended to limit the scope of the present disclosure.
The present disclosure provides a waveform generating system based on frequency domain-time domain mapping, fig. 1 is a schematic structural diagram of the waveform generating system based on frequency domain-time domain mapping according to the present disclosure, please refer to fig. 1, and the system includes:
a laser 1 for outputting sweep laser having a wavelength continuously changing with time;
the input end of the spectrum shaping module 2 is connected with the output end of the laser and is used for receiving and shaping the swept-frequency laser; and
the input end of the photoelectric detector 3 is connected with the output end of the spectrum shaping module and is used for converting the optical signal output by the spectrum shaping module into an electric signal; wherein,
the laser 1, the spectrum shaping module 2 and the photoelectric detector 3 are connected through optical fibers; preferably, the optical fiber is a standard single mode optical fiber, and may also be a multimode optical fiber or other types of optical fibers, without affecting the implementation of the present disclosure.
Furthermore, the output wavelength of the laser is swept laser continuously adjustable along with time, namely the output wavelength at different moments is different. Because the laser output by the laser is the sweep-frequency laser with the wavelength rapidly changing along with the time, the sweep-frequency laser output by the laser is subjected to spectrum shaping by directly adopting the spectrum shaping module by utilizing the characteristic of the time-varying system, and correspondingly, the waveform of the sweep-frequency laser on the time domain is also correspondingly changed. Therefore, the arbitrary waveform generation system provided by the disclosure can realize the mapping of the sweep frequency laser on the time domain without a dispersion medium; by regulating and controlling the working parameters of the frequency spectrum shaping module, namely designing the shape, the frequency and other parameters of the frequency domain waveform of the sweep laser, the optical signal is converted into an electric signal with any waveform through the beat frequency of the photoelectric detector, the complexity and the loss of the system are reduced, and the structure is simple and easy to integrate.
The following describes a waveform generation system based on frequency domain-time domain mapping according to the present disclosure in further detail with reference to specific embodiments.
The laser 1 is selected as a Fourier domain mode-locked frequency-swept laser, the center wavelength of the laser can be tuned, the wavelength scanning bandwidth is 80 nm-140 nm, and the highest scanning frequency can be tuned;
furthermore, the laser in the disclosure is not limited to a fourier domain mode-locked frequency-swept laser, but also can be a distributed feedback laser, a distributed bragg reflector laser or a vertical cavity surface emitting laser, and can output frequency-swept laser with laser wavelength continuously changing along with time, without affecting the implementation of the disclosure; wherein, the distributed feedback laser, the distributed Bragg reflection laser or the vertical cavity surface emitting laser can output sweep frequency laser with the wavelength changing with time by changing current;
in this embodiment, the center wavelength of the swept laser is 1555nm, the wavelength sweep range is 140nm, the wavelength range is the difference between the minimum wavelength and the maximum wavelength, and the sweep rate is 828.49 KHz. The frequency domain waveform and the time domain waveform of the optical signal output by the frequency swept laser are swept under the above parameters, as shown in fig. 2a and 2 b. Referring to fig. 2a and fig. 2b, after a wave form diagram of laser output by the fourier domain mode-locked frequency-swept laser on a frequency domain is horizontally rotated by 180 °, a wave form diagram of an optical signal on a time domain can be obtained, that is, the wave form diagram on the time domain and the wave form diagram on the frequency domain of the frequency-swept laser have the characteristics of opposite directions. Because the wavelength output by the Fourier domain mode-locked frequency-swept laser is linearly changed along with time, a frequency domain oscillogram after horizontally rotating 180 degrees and a time domain oscillogram have the same envelope;
furthermore, the time domain oscillogram and the frequency domain oscillogram of the sweep-frequency laser have the characteristic of the opposite direction, namely, the wavelength scanning of the Fourier domain mode-locked sweep-frequency laser is backward scanning from long wave to short wave;
furthermore, the change of the wavelength of the sweep laser output by the laser along with time is not limited to the linear relation in the embodiment, and the continuous change of the wavelength along with time is met without influencing the implementation of the disclosure;
further, in the present disclosure, parameters such as a wavelength scanning range, a frequency sweeping rate, a center wavelength, and the like of the laser are not limited to specific values in this embodiment, and may be selected and set according to actual requirements, so as to tune a frequency of an output optical signal of the laser.
The frequency spectrum shaping module 2 is selected as a programmable waveform shaper, the input end of the frequency spectrum shaping module is connected with the output end of the Fourier domain mode-locked frequency-swept laser, and laser output by the Fourier domain mode-locked frequency-swept laser is transmitted to the programmable waveform shaper through an optical fiber. In this embodiment, the maximum working wavelength range of the waveform shaper is 1527.4nm to 1567.5nm, and the working wavelength range of the waveform shaper can be selected according to the working wavelength of the fourier domain mode-locked frequency-swept laser, that is, the working wavelength range of the waveform shaper is within the wavelength scanning range of the fourier domain mode-locked frequency-swept laser;
further, the programming is used to set the shape, bandwidth, period, amplitude, center wavelength and other working parameters of the waveform in the waveform shaper, so as to shape the spectrum of the laser output by the fourier domain mode-locked swept-frequency laser (the frequency domain waveform diagram of the laser shown in fig. 2 a). Fig. 3a is a frequency domain waveform diagram of the laser after the spectral shaping, and the spectral shaping is used to change the frequency domain waveform of the optical signal. Since the wavelength of the laser output by the fourier domain mode-locked frequency-swept laser changes linearly with time, after the laser is subjected to spectral shaping by the waveform shaper, the change curve of the amplitude of the laser with time, that is, the time-domain waveform diagram of the optical signal subjected to frequency-domain shaping also changes the same, as shown in fig. 3 b. The laser frequency domain oscillogram output by the swept-frequency laser is shaped by the waveform shaper without passing through a dispersion medium, so that the mapping of an optical signal on a time domain is directly realized;
furthermore, the shape of the laser spectrum oscillogram output by the laser can be changed by setting working parameters of the spectrum shaping module, so that the generation of any waveform is obtained;
furthermore, the spectrum shaping module is not limited to a waveform shaper, and can also be a grating, and the sweep-frequency laser is subjected to spectrum shaping by changing parameters such as the refractive index of the grating and the period of the grating, so that the spectrum of the sweep-frequency laser can be shaped, and the implementation of the present disclosure is not affected.
And the input end of the photoelectric detector 3 is connected with the output end of the waveform shaper through a single-mode fiber, the bandwidth of the photoelectric detector in the embodiment is more than 18GHz, and the responsivity is more than 0.85A/W. The optical signal after passing through the waveform shaper enters the photoelectric detector through the optical fiber, and the optical signal is converted into an electrical signal through beat frequency in the photoelectric detector. Fig. 4 is a waveform diagram obtained after the optical signal output by the waveform shaper passes through the photodetector. Fig. 3b shows a time domain waveform diagram after the optical signal is mapped in the time domain by shaping the frequency domain waveform diagram of the swept laser by the spectrum shaping module, and the time domain waveform diagram has the same envelope as the waveform diagram shown in fig. 4. The shape of a laser spectrogram output by the Fourier domain mode-locked frequency-swept laser is designed through a waveform shaper, and then a microwave signal of any waveform generated based on frequency domain-time domain mapping can be obtained after the microwave signal passes through a photoelectric detector.
Furthermore, the wavelength scanning range and the frequency scanning rate of the scanning laser can influence the spectrum shape of the frequency scanning laser, and the frequency domain oscillogram of the laser can also be changed by the frequency spectrum shaping module, so that the electric signal output by the photoelectric detector can be tuned by changing the wavelength scanning range, the frequency scanning rate of the laser or the working parameters of the frequency spectrum shaping module. Further, the electrical signal output by the photodetector is not limited to the microwave signal, and may be other electrical signals.
In addition, in this embodiment, when the wavelength of the swept-frequency laser output by the laser linearly changes with time, since the frequency-domain waveform diagram and the time-domain waveform diagram of the swept-frequency laser have a fixed linear proportional relationship, the frequency-domain waveform diagram and the time-domain waveform diagram of the optical signal after the spectral shaping change in the same manner, the working parameters of the spectral shaping module can be set as required, that is, the frequency-domain waveform diagram is shaped, so that the time-domain waveform diagram having a certain proportional relationship with the shaped spectral shape is obtained.
The wavelength of the sweep-frequency laser output by the laser can also be changed in a nonlinear way along with time, and because the frequency domain oscillogram and the time domain oscillogram of the optical signal after the frequency spectrum shaping are different in change, the generation of any waveform can be realized by setting the working parameters of the frequency spectrum shaping module according to requirements while observing the time domain oscillogram.
The present disclosure also provides a waveform generation method based on frequency domain-time domain mapping, including the following steps:
step S1, the laser outputs sweep frequency laser with wavelength changing continuously along with time;
preferably, the laser is a fourier domain mode-locked frequency-swept laser, but is not limited to the fourier domain mode-locked frequency-swept laser, and can also be a distributed feedback laser, a distributed bragg reflector laser or a vertical cavity surface emitting laser, so that the output wavelength of the laser can be continuously changed along with time, and the realization of the disclosure is not influenced;
step S2, the frequency spectrum shaping module carries out frequency spectrum shaping on the sweep frequency laser output by the laser;
further, in step S2, adjusting and controlling the operating parameters of the spectrum shaping module to change the spectrum waveform of the sweep laser; because the characteristic of the sweep-frequency laser, namely the wavelength is a continuous function of time, the spectral waveform of the sweep-frequency laser is changed through the spectral shaping module, the time domain oscillogram of the optical signal after frequency domain shaping is also changed, and the mapping of the sweep-frequency laser on the time domain is realized without a dispersion medium, so that the loss and the complexity are reduced, and the integration is easy;
furthermore, the characteristics of the laser spectrum oscillogram output by the laser can be changed by setting working parameters of the spectrum shaping module, so that the generation of any waveform is obtained;
further, the working wavelength range of the spectrum shaping module is within the wavelength scanning range of the laser;
furthermore, the spectrum shaping module is a programmable waveform shaper, and working parameters such as the shape, bandwidth, period, amplitude, center wavelength and the like of a waveform in the programmable waveform shaper are set through programming so as to realize shaping of the frequency spectrum of the sweep laser;
step S3, the photoelectric detector converts the optical signal after the frequency spectrum shaping into an electric signal;
further, the optical signal output by the spectrum shaping module enters the photoelectric detector and then can be converted into an electric signal through beat frequency; the frequency and the waveform of the electric signal can be tuned by changing the wavelength scanning range, the frequency scanning speed or the working parameters of the frequency spectrum shaping module of the frequency scanning laser;
further, the laser, the spectrum shaping module and the photoelectric detector transmit optical signals through optical fibers; preferably, the optical fiber is a standard single mode optical fiber or a multimode optical fiber, and may be other kinds of optical fibers, which does not affect the implementation of the present disclosure;
up to this point, the present embodiment has been described in detail with reference to the accompanying drawings. From the above description, those skilled in the art should clearly recognize that the present disclosure relates to a waveform generation system based on frequency domain-time domain mapping.
It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. Further, the above definitions of the various elements and methods are not limited to the various specific structures, shapes or arrangements of parts mentioned in the examples, which may be modified or substituted by one of ordinary skill in the art.
It is also noted that the illustrations herein may provide examples of parameters that include particular values, but that these parameters need not be exactly equal to the corresponding values, but may be approximated to the corresponding values within acceptable error tolerances or design constraints. Directional phrases used in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., refer only to the direction of the attached drawings and are not intended to limit the scope of the present disclosure.
In summary, the present disclosure discloses a waveform generation system and method based on frequency domain-time domain mapping, in which a laser outputs sweep-frequency laser with wavelength continuously changing with time, and the sweep-frequency laser can be shaped directly to realize mapping in time domain through a spectrum shaping module without passing through a dispersion medium, and then an electrical signal with any waveform can be obtained through a photodetector, which has the characteristics of low loss, reconfigurability, arbitrary waveform generation, and easy integration, thereby being widely applicable to radar, wireless communication, inter-satellite link, modern measurement, and other fields.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A waveform generation system based on frequency-time domain mapping, comprising:
the laser is used for outputting sweep-frequency laser with the wavelength continuously changing along with time;
the input end of the frequency spectrum shaping module is connected with the output end of the laser and is used for receiving and shaping the swept-frequency laser; and
and the input end of the photoelectric detector is connected with the output end of the spectrum shaping module and is used for converting the optical signal output by the spectrum shaping module into an electric signal.
2. The frequency-time domain mapping based waveform generation system as claimed in claim 1, wherein said swept laser is spectrally shaped by a spectral shaping module to alter the time domain waveform of said swept laser.
3. The frequency-time domain mapping based waveform generation system of claim 1, wherein tuning the photodetector output electrical signal is achieved by adjusting a wavelength sweep range, a sweep rate, or an operating parameter of a spectral shaping module of the laser.
4. The frequency-time domain mapping based waveform generation system of claim 1, wherein optical fibers are used for connection between said laser and said spectral shaping module, and between said spectral shaping module and said photodetector.
5. The frequency-time domain mapping based waveform generation system of claim 1 wherein an operating wavelength range of said spectral shaping module is within a wavelength sweep range of said laser.
6. The frequency-time domain mapping based waveform generation system of claim 1 wherein said laser is a fourier domain mode-locked swept laser, a distributed feedback laser, a distributed bragg reflector laser, or a vertical cavity surface emitting laser.
7. The frequency-domain time-domain mapping based waveform generation system of claim 1 wherein said spectral shaping module is a programmable waveform shaper or a grating.
8. A waveform generation method based on frequency domain-time domain mapping, comprising:
the laser outputs sweep-frequency laser with wavelength continuously changing along with time;
the frequency spectrum shaping module is used for carrying out frequency spectrum shaping on the swept laser; and
the photodetector converts the spectrally shaped optical signal into an electrical signal.
9. The method for waveform generation based on frequency-time domain mapping according to claim 8, wherein in the step of spectrally shaping the swept laser by the spectral shaping module,
and performing spectrum shaping on the swept laser through a spectrum shaping module to change the time domain waveform of the swept laser.
10. The method for frequency-time domain mapping based waveform generation as claimed in claim 8, wherein tuning the photodetector output electrical signal is achieved by changing the wavelength sweep range, the sweep rate or the operating parameters of the spectral shaping module of the laser.
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| CN109506788A (en) * | 2018-11-01 | 2019-03-22 | 中国科学院半导体研究所 | Optical wavelength measurement system based on Fourier's mode-locked laser |
| CN110971193A (en) * | 2019-12-05 | 2020-04-07 | 广东工业大学 | Millimeter wave noise signal generator based on FP chaotic laser |
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Application publication date: 20180213 |