CN113992273A - High signal-to-noise ratio spectral output system - Google Patents
High signal-to-noise ratio spectral output system Download PDFInfo
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- CN113992273A CN113992273A CN202111607846.8A CN202111607846A CN113992273A CN 113992273 A CN113992273 A CN 113992273A CN 202111607846 A CN202111607846 A CN 202111607846A CN 113992273 A CN113992273 A CN 113992273A
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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
- H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
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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
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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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
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
Abstract
The present disclosure provides a high signal-to-noise ratio spectral output system, comprising: a modulation spectrum generation module and a frequency sideband suppression module; the modulation spectrum generation module is connected with the frequency sideband suppression module; the modulation spectrum generation module is used for outputting a laser spectrum subjected to phase modulation and sending the laser spectrum to the frequency sideband suppression module, wherein the phase modulation mode is a pseudo-random code phase modulation mode; the frequency sideband suppression module is used for receiving the laser spectrum which is sent by the modulation spectrum generation module and is subjected to phase modulation, filtering out a spectrum sideband generated in the laser spectrum by the pseudo-random code phase modulation mode, and outputting the laser spectrum. The spectrum of the single-frequency laser is broadened in a pseudo-random code phase modulation mode, the stimulated Brillouin scattering threshold value is effectively improved, a spectrum sideband generated by pseudo-random code phase modulation is filtered by a frequency sideband suppression module, the signal-to-noise ratio of the laser spectrum is further improved, and the distribution of the main peak of the laser spectrum is not influenced.
Description
Technical Field
The disclosure relates to the technical field of spectrum modulation, in particular to a high signal-to-noise ratio spectrum output system.
Background
The high-power ultra-narrow linewidth optical fiber laser generally refers to a laser with a spectral linewidth within 10GHz, and is an important light source basis of high-energy optical fiber laser systems such as single grating spectral synthesis and coherent synthesis. However, Stimulated Brillouin Scattering (SBS) is a nonlinear effect with the lowest nonlinear threshold in the ultra-narrow linewidth fiber laser, and is an important factor for limiting the power increase of the high-power ultra-narrow linewidth fiber laser.
The current commonly used phase modulation methods comprise modulation modes such as sine modulation, white noise modulation and pseudo-random code modulation, and in contrast, the pseudo-random code phase modulation mode can realize a higher SBS threshold value under the same line width, and is widely applied to the field of ultra-narrow line width fiber lasers. However, after the single-frequency laser is modulated by the pseudo-random code phase, the spectrum is broadened and obvious sidebands are generated, so that the signal-to-noise ratio of the spectrum is reduced.
Disclosure of Invention
The embodiment of the disclosure at least provides a high signal-to-noise ratio spectral output system, which can improve the signal-to-noise ratio of an output laser spectrum without influencing the distribution of main peaks of the laser spectrum.
The disclosed embodiment provides a high signal-to-noise ratio spectral output system, including: a modulation spectrum generation module and a frequency sideband suppression module;
the modulation spectrum generation module is connected with the frequency sideband suppression module;
the modulation spectrum generation module is used for outputting a laser spectrum subjected to phase modulation and sending the laser spectrum to the frequency sideband suppression module, wherein the phase modulation mode is a pseudo-random code phase modulation mode;
the frequency sideband suppression module is used for receiving the laser spectrum which is sent by the modulation spectrum generation module and is subjected to phase modulation, filtering out a spectrum sideband generated in the laser spectrum by the pseudo-random code phase modulation mode, and outputting the laser spectrum.
In an optional embodiment, the modulation spectrum generation module includes a single-frequency laser output unit, a phase modulation unit, and a pseudo-random code signal output unit;
the input end of the phase modulation unit is connected with the single-frequency laser output unit and the pseudo-random code signal output unit;
the output end of the phase modulation unit is used as the output end of the modulation spectrum generation module and is connected with the frequency sideband suppression module;
the single-frequency laser output unit is used for generating a single-frequency laser signal and sending the single-frequency laser signal to the phase modulation unit;
the pseudo-random code signal output unit is used for generating a pseudo-random voltage and sending the pseudo-random voltage to the phase modulation unit;
the phase modulation unit is used for receiving a single-frequency laser signal generated by the single-frequency laser output unit and a pseudo-random voltage generated by the pseudo-random code signal output unit, adding a phase item to the single-frequency laser signal and broadening the spectrum of the single-frequency laser signal.
In an alternative embodiment, the modulation spectrum generation module further comprises a first optical isolation unit;
the input end of the first optical isolation unit is connected with the single-frequency laser output unit, and the output end of the first optical isolation unit is connected with the phase modulation unit;
the first optical isolation unit is used for isolating return light of the phase modulation unit returning to the single-frequency laser output unit.
In an alternative embodiment, the modulation spectrum generation module further comprises a second optical isolation unit;
the input end of the second optical isolation unit is connected with the output end of the phase modulation unit, and the output end of the second optical isolation unit is connected with the input end of the frequency sideband suppression module;
the second optical isolation unit is used for isolating return light of the frequency sideband suppression module returning to the phase modulation unit.
In an optional embodiment, the modulation spectrum generation module further comprises a radio frequency amplification unit;
the input end of the radio frequency amplification unit is connected with the pseudo-random code signal output unit, and the output end of the radio frequency amplification unit is connected with the phase modulation unit;
the radio frequency amplifying unit is used for amplifying the pseudo-random voltage generated by the pseudo-random code signal output unit and driving the phase modulation unit to work.
In an alternative embodiment, the center wavelength of the frequency sideband suppression module is the same as the center wavelength of the single-frequency laser output unit.
In an alternative embodiment, the bandwidth of the frequency sideband suppression module is twice the modulation frequency of the pseudo random code signal output unit.
In an alternative embodiment, the high snr spectral output system is adapted for both polarization maintaining ultra narrow linewidth seed sources and non-polarization maintaining ultra narrow linewidth seed sources.
In an alternative embodiment, the frequency sideband suppression module is a fiber filter or a low-reflection grating.
In an optional implementation manner, the phase modulation unit is specifically configured to:
determining the laser complex amplitude of the single-frequency laser signal after phase modulation according to the complex amplitude distribution corresponding to the single-frequency laser output unit and the pseudo-random modulation signal output by the pseudo-random code signal output unit;
and carrying out Fourier transform on the laser complex amplitude of the single-frequency laser signal after phase modulation, and determining the laser spectrum distribution of the single-frequency laser signal after phase modulation.
The high signal-to-noise ratio spectral output system provided by the embodiment of the disclosure comprises a modulation spectrum generation module and a frequency sideband suppression module, wherein the modulation spectrum generation module is used for outputting a laser spectrum subjected to phase modulation and sending the laser spectrum to the frequency sideband suppression module, and the phase modulation mode is a pseudo-random code phase modulation mode; the frequency sideband suppression module is used for receiving the laser spectrum which is sent by the modulation spectrum generation module and is subjected to phase modulation, filtering out a spectrum sideband generated in the laser spectrum by the pseudo-random code phase modulation mode, and outputting the laser spectrum. The modulation spectrum generation module widens the spectrum of the single-frequency laser in a pseudo-random code phase modulation mode, the stimulated Brillouin scattering threshold value is effectively improved, and then the spectrum sideband generated by pseudo-random code phase modulation is filtered by the frequency sideband suppression module, so that the signal-to-noise ratio of the laser spectrum is improved, and meanwhile, the distribution of the main peak of the laser spectrum is not influenced.
In order to make the aforementioned objects, features and advantages of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly described below, and the drawings herein incorporated in and forming a part of the specification illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the technical solutions of the present disclosure. It is appreciated that the following drawings depict only certain embodiments of the disclosure and are therefore not to be considered limiting of its scope, for those skilled in the art will be able to derive additional related drawings therefrom without the benefit of the inventive faculty.
FIG. 1 shows one of the schematic structural diagrams of a high SNR spectral output system provided by the embodiments of the present disclosure;
FIG. 2 is a second schematic diagram illustrating a high SNR spectral output system according to an embodiment of the present disclosure;
FIG. 3 is a third schematic diagram illustrating a high SNR spectral output system according to an embodiment of the present disclosure;
fig. 4 shows a schematic spectrum diagram of a single-frequency laser signal output by the single-frequency laser output unit according to the embodiment of the present disclosure after phase modulation of a pseudo random code signal with a modulation frequency of 5GHz and a modulation format of 4;
fig. 5 shows a schematic spectrum diagram of a single-frequency laser signal output by the single-frequency laser output unit according to the embodiment of the present disclosure after being phase-modulated by a pseudo-random code signal with a modulation frequency of 5GHz and a modulation format of 4, and being filtered by a frequency sideband suppression module.
Illustration of the drawings: 100-high signal-to-noise ratio spectral output system; 110-a modulation spectrum generation module; 120-frequency sideband suppression module; 111-single frequency laser output unit; 112-a phase modulation unit; 113-pseudo random code signal output unit; 114-a first optical isolation unit; 115-a second optical isolation unit; 116-radio frequency amplification unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, not all of the embodiments. The components of the embodiments of the present disclosure, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present disclosure, presented in the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the disclosure without making creative efforts, shall fall within the protection scope of the disclosure.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The term "and/or" herein merely describes an associative relationship, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
Research shows that the currently common phase modulation methods comprise modulation modes such as sine modulation, white noise modulation, pseudo-random code modulation and the like, and in contrast, the pseudo-random code phase modulation mode can realize a higher SBS threshold value under the same line width, and is widely applied to the field of ultra-narrow line width fiber lasers. However, after the single-frequency laser is modulated by the pseudo-random code phase, the spectrum is broadened and obvious sidebands are generated, so that the signal-to-noise ratio of the spectrum is reduced.
Based on the research, the present disclosure provides a high signal-to-noise ratio spectral output system, which includes a modulation spectrum generation module and a frequency sideband suppression module, wherein the modulation spectrum generation module is configured to output a laser spectrum after phase modulation, and send the laser spectrum to the frequency sideband suppression module, and a phase modulation mode is a pseudo-random code phase modulation mode; the frequency sideband suppression module is used for receiving the laser spectrum which is sent by the modulation spectrum generation module and is subjected to phase modulation, filtering out a spectrum sideband generated in the laser spectrum by the pseudo-random code phase modulation mode, and outputting the laser spectrum. The modulation spectrum generation module widens the spectrum of the single-frequency laser in a pseudo-random code phase modulation mode, the stimulated Brillouin scattering threshold value is effectively improved, and then the spectrum sideband generated by pseudo-random code phase modulation is filtered by the frequency sideband suppression module, so that the signal-to-noise ratio of the laser spectrum is improved, and meanwhile, the distribution of the main peak of the laser spectrum is not influenced.
For the understanding of the present embodiment, a detailed description will be given first of all to a high signal-to-noise ratio spectral output system disclosed in the embodiments of the present disclosure.
Referring to fig. 1, a schematic structural diagram of a high snr spectral output system 100 according to an embodiment of the present disclosure is shown.
Here, the high signal-to-noise ratio spectral output system 100 includes: a modulation spectrum generation module 110 and a frequency sideband suppression module 120.
The modulation spectrum generation module 110 is connected to the frequency sideband suppression module 120.
The modulation spectrum generation module 110 is configured to output a laser spectrum after phase modulation, and send the laser spectrum to the frequency sideband suppression module 120, and the frequency sideband suppression module 120 is configured to receive the laser spectrum after phase modulation sent by the modulation spectrum generation module 110, filter a spectrum sideband generated in the laser spectrum by the pseudo-random code phase modulation method, and output a laser spectrum with a high signal-to-noise ratio.
Specifically, the modulation spectrum generation module 110 adopts a pseudo random code phase modulation method.
As a possible embodiment, the pseudo random code phase modulation is implemented based on a method in which a pseudo random code modulation format n generates a random number of 2n-1 in length, and the generation probability of 0 and 1 in the random number is 50%. The random number is repeated after 2 n-1. Where 0 and 1 denote a modulation depth of 0 and a modulation depth of pi, respectively. When the modulation format is n and the modulation frequency is fm, the output laser spectrum contains 2n-1 modes, and the interval between the respective modes is Δ f = fm/(2 n-1). For the pseudo random code phase modulation scheme, the modulation format n and the modulation frequency fm determine the line width and power distribution of the signal light.
Compared with sinusoidal modulation and white noise modulation, pseudo-random code phase modulation can achieve a higher stimulated Brillouin scattering threshold under the condition of the same line width.
As a possible implementation, the frequency sideband suppression module 120 may be a fiber filter or a low-reflection grating.
As a possible implementation, the high snr spectral output system 100 is suitable for both polarization-maintaining ultra-narrow linewidth seed sources and non-polarization-maintaining ultra-narrow linewidth seed sources. The output high signal-to-noise ratio laser spectrum can be used as the light source basis of high-energy fiber laser systems such as single grating spectrum synthesis, coherent synthesis and the like.
The high signal-to-noise ratio spectral output system provided by the embodiment of the disclosure comprises a modulation spectrum generation module and a frequency sideband suppression module, wherein the modulation spectrum generation module is used for outputting a laser spectrum subjected to phase modulation and sending the laser spectrum to the frequency sideband suppression module, and the phase modulation mode is a pseudo-random code phase modulation mode; the frequency sideband suppression module is used for receiving the laser spectrum which is sent by the modulation spectrum generation module and is subjected to phase modulation, filtering out a spectrum sideband generated in the laser spectrum by the pseudo-random code phase modulation mode, and outputting the laser spectrum. The modulation spectrum generation module widens the spectrum of the single-frequency laser in a pseudo-random code phase modulation mode, the stimulated Brillouin scattering threshold value is effectively improved, and then the spectrum sideband generated by pseudo-random code phase modulation is filtered by the frequency sideband suppression module, so that the signal-to-noise ratio of the laser spectrum is improved, and meanwhile, the distribution of the main peak of the laser spectrum is not influenced.
Referring to fig. 2, a second schematic diagram of a high snr spectral output system 100 according to an embodiment of the present disclosure is shown.
Here, the high signal-to-noise ratio spectral output system 100 includes: a modulation spectrum generation module 110 and a frequency sideband suppression module 120. The modulation spectrum generation module 110 includes a single-frequency laser output unit 111, a phase modulation unit 112, and a pseudo random code signal output unit 113.
The input end of the phase modulation unit 112 is connected to the single-frequency laser output unit 111 and the pseudo random code signal output unit 113; the output end of the phase modulation unit 112 is used as the output end of the modulation spectrum generation module 110, and is connected to the frequency sideband suppression module 120;
the single-frequency laser output unit 111 is configured to generate a single-frequency laser signal and send the single-frequency laser signal to the phase modulation unit 112; the pseudo random code signal output unit 113 is configured to generate a pseudo random voltage and send the pseudo random voltage to the phase modulation unit 112; the phase modulation unit 112 is configured to receive a single-frequency laser signal generated by the single-frequency laser output unit 111 and a pseudorandom voltage generated by the pseudorandom code signal output unit 113, add a phase term to the single-frequency laser signal, and broaden a spectrum of the single-frequency laser signal.
The single-frequency laser output unit 111 may be a single-frequency laser, and the pseudo-random code signal output unit 113 may be a pseudo-random code signal source.
As a possible embodiment, the phase modulation unit 112 modulates the single-frequency laser signal output by the single-frequency laser output unit 111 by the following method:
determining the laser complex amplitude of the single-frequency laser signal after phase modulation according to the complex amplitude distribution corresponding to the single-frequency laser signal output by the single-frequency laser output unit 111 and the pseudo-random voltage output by the pseudo-random code signal output unit 113 as pseudo-random modulation signals; and carrying out Fourier transform on the laser complex amplitude of the single-frequency laser signal after phase modulation, and determining the laser spectrum distribution of the single-frequency laser signal after phase modulation.
Specifically, the modulation principle of the phase modulation unit 112 for performing phase modulation on the single-frequency laser output unit 111 is as follows: the phase modulation unit 112 adds a phase term to the single-frequency laser signal generated by the single-frequency laser output unit 111, thereby broadening the spectrum of the single-frequency laser signal. It is assumed that the complex amplitude distribution of the single-frequency laser signal output by the single-frequency laser output unit 111 is:
the phase modulation signal is
Determining the laser complex amplitude of the single-frequency laser signal after phase modulation based on the following formula:
wherein E is0Representing the actual amplitude of the single frequency laser signal; ω represents angular frequency; t represents time; j represents an imaginary unit; exp stands for e-exponential operation.
Fourier change is carried out on the complex amplitude E (t) of the laser subjected to the phase modulation, and laser spectrum distribution of the single-frequency laser signal subjected to the phase modulation can be obtained. Wherein, different phase modulation modes correspond to different ones in the above formula
Resulting in differences in the spectral distribution of the modulated laser, which, in the case of pseudo-random code phase modulation,
is a pseudo-random voltage.
As a possible implementation, to ensure the filtering effect, it is required to ensure that the center wavelength of the frequency sideband suppression module 120 is the same as the center wavelength of the single-frequency laser output unit 111, and the bandwidth of the frequency sideband suppression module 120 is 2 times of the pseudo random code modulation frequency. For example: for the pseudo random code signal with the modulation frequency of 5GHz and the modulation format of 4, the bandwidth of the adopted frequency sideband suppression module 120 is 10GHz (i.e. the bandwidth of 0.038nm for the 1064nm single-frequency laser output unit 111).
Referring to fig. 3, a third schematic structural diagram of a high snr spectral output system 100 according to an embodiment of the present disclosure is shown.
Here, the high signal-to-noise ratio spectral output system 100 includes: a modulation spectrum generation module 110 and a frequency sideband suppression module 120. The modulation spectrum generation module 110 includes a single-frequency laser output unit 111, a phase modulation unit 112, and a pseudo random code signal output unit 113. The modulation spectrum generation module 110 further includes a first optical isolation unit 114 and a second optical isolation unit 115. The modulation spectrum generation module 110 further includes a radio frequency amplification unit 116.
The input of first optical isolation unit 114 with single-frequency laser output unit 111 connects, the output of first optical isolation unit 114 with phase modulation unit 112 connects, the input of second optical isolation unit 115 with phase modulation unit 112's output is connected, the output of second optical isolation unit 115 with frequency sideband suppression module 120's input is connected, the input of radio frequency amplification unit 116 with pseudo-random code signal output unit 113 connects, the 116 output of radio frequency amplification unit with phase modulation unit 112 connects.
Wherein the first optical isolation unit 114 is configured to isolate the return light of the phase modulation unit 112 returning to the single-frequency laser output unit 111. The second optical isolation unit 115 is configured to isolate the return light of the frequency sideband suppression module 120 returning to the phase modulation unit 112. The rf amplifying unit 116 is configured to amplify the pseudo random voltage generated by the pseudo random code signal output unit 113, and drive the phase modulating unit 112 to operate.
Specifically, the single-frequency laser light output from the single-frequency laser light output unit 111 enters the phase modulation unit 112 through the first optical isolation unit 114. The pseudo random code signal generated by the pseudo random code signal output unit 113 is amplified by the radio frequency amplification unit 116 and drives the phase modulation unit 112, so that the spectrum of the single-frequency laser output by the single-frequency laser output unit 111 is broadened. The single-frequency laser signal phase-modulated by the phase modulation unit 112 enters the frequency sideband suppression module 120 after passing through the second optical isolation unit 115, and the spectral sideband generated by the phase modulation unit 112 in a pseudo-random code phase modulation manner is filtered. The first optical isolation unit 114 and the second optical isolation unit 115 can effectively isolate the return light, and the return light is prevented from damaging a previous stage system.
As a possible embodiment, the first and second optical isolation units 114 and 115 may be optical isolators. The rf amplifying unit 116 may be an rf amplifier.
As a possible implementation manner, referring to fig. 4, a schematic spectrum diagram of a single-frequency laser signal output by the single-frequency laser output unit 111 according to the embodiment of the present disclosure after being phase-modulated by a pseudo random code signal having a modulation frequency of 5GHz and a modulation format of 4 is shown.
As shown in fig. 4, the main peak of the spectrum after modulation by the phase modulation unit 112 is located in the central wavelength ± 5GHz range, while there are distinct sidebands outside the main peak, and the spectral signal-to-noise ratio is only about 15 dB.
As a possible implementation manner, referring to fig. 5, a schematic spectrum diagram of a single-frequency laser signal output by the single-frequency laser output unit 111 provided in the embodiment of the present disclosure after being phase-modulated by a pseudo random code signal with a modulation frequency of 5GHz and a modulation format of 4 and being filtered by the frequency sideband suppression module 120 is shown.
Here, in order to secure the filtering effect, the center wavelength of the frequency sideband suppression module 120 is the same as the center wavelength of the single frequency laser output unit 111. The bandwidth of the frequency sideband suppression module 120 is twice the modulation frequency of the pseudo random code signal output unit 113. I.e. the bandwidth of the frequency sideband suppression module 120 is 10 GHz.
As shown in fig. 5, after the spectrum modulated by the phase modulation unit 112 passes through the frequency sideband suppression module 120, the spectral bandwidth is effectively reduced outside ± 5GHz, the spectral signal-to-noise ratio is significantly improved, and the main peak distribution of the laser spectrum is not affected.
The high signal-to-noise ratio spectral output system provided by the embodiment of the disclosure comprises a modulation spectrum generation module and a frequency sideband suppression module, wherein the modulation spectrum generation module is used for outputting a laser spectrum subjected to phase modulation and sending the laser spectrum to the frequency sideband suppression module, and the phase modulation mode is a pseudo-random code phase modulation mode; the frequency sideband suppression module is used for receiving the laser spectrum which is sent by the modulation spectrum generation module and is subjected to phase modulation, filtering out a spectrum sideband generated in the laser spectrum by the pseudo-random code phase modulation mode, and outputting the laser spectrum. The modulation spectrum generation module widens the spectrum of the single-frequency laser in a pseudo-random code phase modulation mode, the stimulated Brillouin scattering threshold value is effectively improved, and then the spectrum sideband generated by pseudo-random code phase modulation is filtered by the frequency sideband suppression module, so that the signal-to-noise ratio of the laser spectrum is improved, and meanwhile, the distribution of the main peak of the laser spectrum is not influenced.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. In the several embodiments provided in the present disclosure, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present disclosure. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, it should be noted that: the above-mentioned embodiments are merely specific embodiments of the present disclosure, which are used for illustrating the technical solutions of the present disclosure and not for limiting the same, and the scope of the present disclosure is not limited thereto, and although the present disclosure is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive of the technical solutions described in the foregoing embodiments or equivalent technical features thereof within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present disclosure, and should be construed as being included therein. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. A high signal-to-noise ratio spectral output system, comprising: a modulation spectrum generation module and a frequency sideband suppression module;
the modulation spectrum generation module is connected with the frequency sideband suppression module;
the modulation spectrum generation module is used for outputting a laser spectrum subjected to phase modulation and sending the laser spectrum to the frequency sideband suppression module, wherein the phase modulation mode is a pseudo-random code phase modulation mode;
the frequency sideband suppression module is used for receiving the laser spectrum which is sent by the modulation spectrum generation module and is subjected to phase modulation, filtering out a spectrum sideband generated in the laser spectrum by the pseudo-random code phase modulation mode, and outputting the laser spectrum.
2. The high signal-to-noise ratio spectral output system of claim 1, wherein the modulation spectrum generation module comprises a single frequency laser output unit, a phase modulation unit, and a pseudo-random code signal output unit;
the input end of the phase modulation unit is connected with the single-frequency laser output unit and the pseudo-random code signal output unit;
the output end of the phase modulation unit is used as the output end of the modulation spectrum generation module and is connected with the frequency sideband suppression module;
the single-frequency laser output unit is used for generating a single-frequency laser signal and sending the single-frequency laser signal to the phase modulation unit;
the pseudo-random code signal output unit is used for generating a pseudo-random voltage and sending the pseudo-random voltage to the phase modulation unit;
the phase modulation unit is used for receiving a single-frequency laser signal generated by the single-frequency laser output unit and a pseudo-random voltage generated by the pseudo-random code signal output unit, adding a phase item to the single-frequency laser signal and broadening the spectrum of the single-frequency laser signal.
3. A high signal-to-noise ratio spectral output system in accordance with claim 2, wherein said modulation spectrum generation module further comprises a first optical isolation unit;
the input end of the first optical isolation unit is connected with the single-frequency laser output unit, and the output end of the first optical isolation unit is connected with the phase modulation unit;
the first optical isolation unit is used for isolating return light of the phase modulation unit returning to the single-frequency laser output unit.
4. A high signal-to-noise ratio spectral output system in accordance with claim 3, wherein said modulation spectrum generation module further comprises a second optical isolation unit;
the input end of the second optical isolation unit is connected with the output end of the phase modulation unit, and the output end of the second optical isolation unit is connected with the input end of the frequency sideband suppression module;
the second optical isolation unit is used for isolating return light of the frequency sideband suppression module returning to the phase modulation unit.
5. A high signal-to-noise ratio spectral output system in accordance with claim 2, wherein said modulation spectrum generation module further comprises a radio frequency amplification unit;
the input end of the radio frequency amplification unit is connected with the pseudo-random code signal output unit, and the output end of the radio frequency amplification unit is connected with the phase modulation unit;
the radio frequency amplifying unit is used for amplifying the pseudo-random voltage generated by the pseudo-random code signal output unit and driving the phase modulation unit to work.
6. A high signal-to-noise ratio spectral output system according to claim 2, wherein:
the central wavelength of the frequency sideband suppression module is the same as that of the single-frequency laser output unit.
7. A high signal-to-noise ratio spectral output system according to claim 2, wherein:
the bandwidth of the frequency sideband suppression module is twice of the modulation frequency of the pseudo-random code signal output unit.
8. A high signal-to-noise ratio spectral output system according to claim 1, wherein:
the high signal-to-noise ratio spectral output system is suitable for polarization-maintaining ultra-narrow line width seed sources and non-polarization-maintaining ultra-narrow line width seed sources.
9. A high signal-to-noise ratio spectral output system according to claim 1, wherein:
the frequency sideband suppression module is an optical fiber filter or a low-reflection grating.
10. The high signal-to-noise ratio spectral output system of claim 2, wherein the phase modulation unit is specifically configured to:
determining the laser complex amplitude of the single-frequency laser signal after phase modulation according to the complex amplitude distribution corresponding to the single-frequency laser signal output by the single-frequency laser output unit and the pseudo-random modulation signal output by the pseudo-random code signal output unit;
and carrying out Fourier transform on the laser complex amplitude of the single-frequency laser signal after phase modulation, and determining the laser spectrum distribution of the single-frequency laser signal after phase modulation.
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