CN217789030U - Digital spectrum controllable laser seed source - Google Patents
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Abstract
The utility model discloses a controllable laser seed source of digital spectrum, by DFB laser drive module, the adjustable microwave noise source of digital broadband, photoelectric phase modulator three module composition, DFB laser drive module and the output of the adjustable microwave noise source of digital broadband link to each other with the input of photoelectric phase modulator, the output of photoelectric phase modulator is seed source spectral output; the utility model has the advantages that: by adopting the digital broadband adjustable microwave noise source, the digital broadband adjustable microwave noise source has the function of multiple development, and can shape the spectrum according to the requirement, change the spectral characteristics of the output of the digital spectrum controllable laser seed source and improve the laser amplification efficiency and the synthesis efficiency; and meanwhile, more favorable conditions are created for technical secrecy.
Description
Technical Field
The utility model relates to a laser seed source, specifically speaking are controllable laser seed source of digital spectrum belongs to laser seed source field.
Background
The laser seed source is a special application field in China, and the laser seed source is just started in China, basically meets the requirements, is mainly in an analog form, and has no digital seed source product. Meanwhile, the seed source in analog form has the following problems: firstly, in the overall design, a noise source of a core part assembly adopts a simulation mode, once a product is shaped and cured, key parameters influencing the performance of a seed source cannot be flexibly changed, specific products need to be developed according to different customer requirements, the workload is large, and the economic cost is high; secondly, in the aspect of engineering design, the noise source of the core part assembly realized in a simulation mode is easy to copy, so that the technical engineering confidentiality of the whole seed source is not strong, and the noise source is easy to be copied and targeted by competitors; and thirdly, the technical indexes also have a promotion space. The laser seed source also belongs to the field of special application in foreign countries, and the foreign countries have digital seed source products, but the price is high, and the special application cannot be met.
In the prior art, an analog laser seed source is basically used as a main source, and after a product is shaped, the characteristics of output spectrum broadening, waveform edge, spectrum shape, in-band flatness and the like cannot be edited according to requirements, so that multiple development functions are lacked, and flexibility is lacked particularly in scientific research work for improving laser amplification efficiency and synthesis efficiency; the core device of the analog laser seed source is easy to copy, lacks the secret means of engineering technology, and is easy to copy or aim at; breaks through the monopoly situation of the digital laser seed source by foreign technology. The prior art has the following disadvantages: firstly, nuclear core portion subassembly noise source adopts the analog form, and the product is stereotyped and is solidified the back, and the key parameter that influences seed source performance can't be changed in a flexible way, to different customer demands, need develop specific product, and work load is big, and economic cost is high. In the aspect of engineering design, the core part component noise source realized in a simulation mode is easy to copy, so that the security of the whole seed source technical engineering is not strong, and the whole seed source is easy to be copied and targeted by competitors. In the prior art, the laser amplification efficiency and the synthesis efficiency have a larger promotion space.
Disclosure of Invention
The utility model aims at designing a digital spectrum controllable laser seed source, having multiple development function by adopting the digital broadband adjustable microwave noise source, and being capable of forming the spectrum according to the requirement, changing the spectral characteristic of the output of the digital spectrum controllable laser seed source, and improving the laser amplification efficiency and the synthesis efficiency; and meanwhile, more favorable conditions are created for technical secrecy.
The technical scheme of the utility model is that:
a digital spectrum controllable laser seed source is composed of a DFB laser driving module, a digital broadband adjustable microwave noise source and a photoelectric phase modulator, wherein the output ends of the DFB laser driving module and the digital broadband adjustable microwave noise source are connected with the input end of the photoelectric phase modulator, and the output end of the photoelectric phase modulator is used for outputting a seed source spectrum.
The DFB laser driving module mainly comprises a master control unit and a DFB laser, wherein the master control unit comprises a communication control circuit, a power supply circuit, a power drive circuit, a temperature control circuit, a driving circuit and the like. The communication control circuit comprises a serial communication interface for communicating with the outside, and the serial communication and power supply are realized through the serial communication interface; the communication control circuit controls the power supply circuit to output working power supplies required by circuits such as DFB laser drive, power drive, temperature control, drive circuit and the like; the communication control circuit controls power drive, temperature control and a drive circuit, and realizes control of the center wavelength and the output power of the DFB laser.
The digital broadband adjustable microwave noise source mainly comprises a digital noise source generating circuit, a band-pass filter, a gain adjusting/equalizing/amplifying circuit, a low-pass filter, a coupler, a detector and the like. The digital noise source generating circuit mainly comprises an FPGA, a memory, a clock chip, a DAC, a power supply unit, a microprocessing unit MCU and other parts; the gain adjusting/equalizing/amplifying circuit mainly comprises a numerical control attenuator, an equalizer, an amplifier and the like. The general control unit of the DFB laser driving module is connected with the DFB laser, the digital noise source generating circuit of the digital broadband adjustable microwave noise source and the gain adjusting/equalizing/amplifying circuit in a control way; after external communication control information passes through a master control unit of the DFB laser driving module, controlling the DFB laser to output a laser signal; simultaneously controlling a digital noise source generating circuit in the digital broadband adjustable microwave noise source to generate a broadband adjustable radio frequency signal RFA; then controlling a gain adjusting/equalizing/amplifying circuit in the digital broadband adjustable microwave noise source, and carrying out gain adjustment, equalization and amplification on a broadband adjustable radio frequency signal RFA after the RFA passes through a band-pass filter; the broadband adjustable radio frequency signal RFA sequentially passes through a band-pass filter, a numerical control attenuator, an equalizer, an amplifier, a low-pass filter and a coupler and then outputs a coupled signal and a through signal, wherein the coupled signal passes through a detector and then outputs detection information which is transmitted back to the digital noise source generating circuit and information is reported through a master control unit in the DFB laser driving module 1, and the other through signal RFB and a laser signal output by the DFB laser output a broadened laser signal after passing through the photoelectric phase modulator and serve as seed source light output.
And an external control and power supply is input through the serial port communication and power supply A of the DFB laser driving module, and respectively outputs various voltages, control codes required by communication, control information of power control and temperature control and control information required by a driving circuit after being processed by the power supply after passing through the master control unit, and controls the DFB laser to output a spectrum containing information such as central wavelength, output optical power and the like.
The digital broadband adjustable microwave noise source generates or reads signals in various forms or waveforms stored in a memory according to devices such as an FPGA, the memory, a clock chip, a power supply unit and a microprocessing unit MCU, and outputs a low-power broadband adjustable radio frequency signal RFA after passing through a high-speed DAC, the broadband adjustable radio frequency signal RFA outputs a high-power radio frequency signal RFB after passing through a gain adjusting/equalizing/amplifying circuit and a low-pass filter, and the high-power radio frequency signal RFB serves as radio frequency input of a photoelectric phase modulator and provides enough half-wave voltage for the photoelectric phase modulator.
The digital broadband adjustable microwave noise source detects the output power values at different temperatures through the coupler and the detector, and controls the numerical control attenuator through the FPGA, so that the digital broadband adjustable microwave noise source outputs the same power value under different environments.
The digital broadband adjustable microwave noise source adjusts the amplitude-frequency characteristics of the generated or stored waveform according to the in-band flatness of the output of the high-power radio frequency signal RFB, and improves the in-band flatness; according to the system requirement, the output power of the high-power radio frequency signal RFB is adjusted by adjusting the attenuation value of the numerical control attenuator, so that the spectrum is controllable; the characteristics of spectral broadening, waveform edges, spectral shape, in-band flatness and the like of the output are modified by editing the generated or stored waveform form.
The Gaussian white noise generated by the digital broadband adjustable microwave noise source is combined with a hardware circuit of the digital broadband adjustable microwave noise source, the amplitude distribution of the Gaussian white noise is adjusted, spectrum shaping is realized, the flatness in a spectrum band is improved, and the laser amplification efficiency and the laser synthesis efficiency are improved.
The digital broadband adjustable microwave noise source is modified into noise signals in other modes according to requirements, such as Rayleigh distributed noise signals or uniformly distributed noise signals.
Preferably, the digital bandwidth-adjustable microwave noise source outputs high-flatness white gaussian noise.
Preferably, the digital bandwidth-adjustable microwave noise source generates gaussian white noise by means of a transformation method, a rejection method, a recursion method and the like, and monitors the spectral characteristics of an output signal RFB of the digital bandwidth-adjustable microwave noise source in combination with a hardware circuit of the digital bandwidth-adjustable microwave noise source, adjusts the amplitude distribution of the gaussian white noise, and realizes spectrum shaping.
Preferably, the digital broadband adjustable microwave noise source produces a required waveform through matlab, stores the waveform into a memory, and then combines with the FPGA and the DAC to realize generation, storage, playback and digital-to-analog conversion of high-flatness Gaussian white noise and output.
Preferably, the digital broadband adjustable microwave noise source generates a required waveform in the FPGA through an algorithm, and then the digital-to-analog conversion is realized through the DAC and then the output is realized.
Preferably, the radio frequency operating frequency range of the electro-optic phase modulator is larger than the operating frequency range of the digital broadband adjustable microwave noise source output.
By monitoring the signal output by the digital broadband adjustable microwave noise source, a compensation coefficient is formulated, and the generated waveform is corrected in real time, the output of the Gaussian white noise signal with high flatness is realized.
Firstly, an equalizer is adopted to equalize the spectral characteristics of the digital broadband adjustable microwave noise source which is monotonously decreased or monotonously increased into a horizontal or wavy spectrum, and then the flatness in an output band is accurately adjusted by modifying the generated waveform.
The digital broadband adjustable microwave noise source improves the environmental adaptability by adopting an automatic gain control mode and improves the stability of the output spectrum of the digital spectrum controllable laser seed source.
The utility model has the advantages that: by adopting the digital broadband adjustable microwave noise source, the digital broadband adjustable microwave noise source has the function of multiple development, and can shape the spectrum according to the requirement, change the spectral characteristics of the output of the digital spectrum controllable laser seed source and improve the laser amplification efficiency and the synthesis efficiency; meanwhile, a more favorable condition is created for technical secrecy;
the spectral characteristics of the output of the seed source are flexibly changed, and the characteristics of spectral broadening, waveform edge, spectral shape, in-band flatness and the like of the output are edited according to requirements, so that a single set of seed source has the functions of multiple development and realization of multiple sets of seed sources by one set of seed source;
by realizing spectrum shaping, the spectrum output characteristic of the seed source is adjusted, and the laser amplification efficiency and the synthesis efficiency are improved;
fills the blank of the domestic digital laser seed source and breaks through the situation that the digital laser seed source is monopolized by foreign technologies. Products with digital seed sources exist abroad, but the products are expensive and cannot meet the requirements of special applications; the method is in a starting stage in China and mainly uses an analog laser seed source.
The present invention will be further explained with reference to the drawings and examples.
Drawings
Fig. 1 is a block diagram illustrating a digital spectrum-controllable laser seed source according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of an embodiment of the present invention.
Fig. 3 is a schematic block diagram of a DFB laser driving module according to an embodiment of the present invention.
Fig. 4 shows a shape before spectrum forming according to an embodiment of the present invention.
Fig. 5 shows the shape after spectrum shaping according to the embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is not intended to limit the invention.
Example 1
As shown in fig. 1, a digital spectrum controllable laser seed source is composed of three modules, namely, a DFB laser driving module 1, a digital broadband adjustable microwave noise source 2, and an optoelectronic phase modulator 3, wherein output ends of the DFB laser driving module 1 and the digital broadband adjustable microwave noise source 2 are connected with an input end of the optoelectronic phase modulator 3, an output end of the optoelectronic phase modulator 3 is a seed source spectrum output, and a schematic block diagram thereof is shown in fig. 2, wherein a schematic block diagram of the DFB laser driving module 1 is shown in fig. 3.
As shown in fig. 3, the DFB laser driving module 1 mainly comprises a general control unit and a DFB laser, wherein the general control unit comprises a communication control circuit, a power supply circuit, a power driver, a temperature controller, a driving circuit, and the like. The communication control circuit comprises a serial communication interface for communicating with the outside, and the serial communication and power supply are realized through the serial communication interface; the communication control circuit controls the power supply circuit to output working power supplies required by circuits such as DFB laser drive, power drive, temperature control, drive circuit and the like; the communication control circuit controls power drive, temperature control and a drive circuit, and realizes control of the center wavelength and the output power of the DFB laser.
As shown in fig. 2, the digital broadband-tunable microwave noise source 2 mainly comprises a digital noise source generating circuit, a band-pass filter, a gain-tuning/equalizing/amplifying circuit, a low-pass filter, a coupler, a detector, and the like. The digital noise source generating circuit mainly comprises an FPGA, a memory, a clock chip, a DAC, a power supply unit, a microprocessing unit MCU and other parts; the gain adjusting/equalizing/amplifying circuit mainly comprises an amplifier, an equalizer, a numerical control attenuator and the like. The general control unit of the DFB laser driving module 1 is connected with the DFB laser, the digital noise source generating circuit of the digital broadband adjustable microwave noise source 2 and the gain adjusting/equalizing/amplifying circuit in a control way; after external communication control information passes through a master control unit of the DFB laser driving module 1, controlling the DFB laser to output a laser signal; simultaneously controlling a digital noise source generating circuit in the digital broadband adjustable microwave noise source 2 to generate a broadband adjustable radio frequency signal RFA; then controlling a gain adjusting/equalizing/amplifying circuit in the digital broadband adjustable microwave noise source 2, and carrying out gain adjustment, equalization and amplification on a broadband adjustable radio frequency signal RFA after the RFA passes through a band-pass filter; the broadband adjustable radio frequency signal RFA sequentially passes through a band-pass filter, a numerical control attenuator, an equalizer, an amplifier, a low-pass filter and a coupler and then outputs a coupled signal and a through signal, wherein the coupled signal passes through a detector and then outputs detection information which is transmitted back to the digital noise source generating circuit and information is reported through a master control unit in the DFB laser driving module 1, and the other through signal RFB and a laser signal output by the DFB laser output a broadened laser signal after passing through the photoelectric phase modulator and serve as seed source light output.
As shown in fig. 2 and fig. 3, an external control and power supply is input through the serial port communication and power supply a of the DFB laser driving module 1, and after passing through the general control unit, the external control and power supply respectively outputs various voltages processed by the power supply, control codes required for communication, control information for power control and temperature control, and control information required for the driving circuit, and controls the DFB laser to output a spectrum including information such as a center wavelength and output optical power.
The digital broadband adjustable microwave noise source 2 generates or reads signals of various forms or waveforms stored in a memory according to devices such as an FPGA, the memory, a clock chip, a power supply unit, a microprocessing unit MCU and the like, and outputs a low-power broadband adjustable radio frequency signal RFA after passing through a high-speed DAC, the broadband adjustable radio frequency signal RFA outputs a high-power radio frequency signal RFB after passing through a gain adjusting/equalizing/amplifying circuit and a low-pass filter, and the high-power radio frequency signal RFB serves as radio frequency input of the photoelectric phase modulator 3 and provides enough half-wave voltage for the photoelectric phase modulator.
The digital broadband adjustable microwave noise source 2 detects the output power values at different temperatures through the coupler and the detector, and controls the numerical control attenuator through the FPGA, so that the digital broadband adjustable microwave noise source 2 outputs the same power value under different environments.
The digital broadband adjustable microwave noise source 2 adjusts the amplitude-frequency characteristics of the generated or stored waveform according to the flatness in the output band of the high-power radio frequency signal RFB, and improves the flatness in the band; according to the system requirements, the output power of the high-power radio frequency signal RFB is adjusted by adjusting the attenuation value of the numerical control attenuator, so that the spectrum is controllable; the characteristics of spectral broadening, waveform edges, spectral shape, in-band flatness and the like of the output are modified by editing the generated or stored waveform form.
As shown in fig. 4 and 5, the gaussian white noise generated by the digital bandwidth-adjustable microwave noise source 2 is combined with the hardware circuit of the digital bandwidth-adjustable microwave noise source 2 to adjust the amplitude distribution of the gaussian white noise, thereby realizing spectrum shaping, improving the flatness in the spectrum band, and improving the laser amplification efficiency and the synthesis efficiency.
The digital broadband adjustable microwave noise source 2 is modified into other noise signals such as rayleigh distributed noise signals or uniformly distributed noise signals according to requirements.
The digital broadband adjustable microwave noise source 2 outputs high-flatness Gaussian white noise, and provides modulation signals with good amplitude consistency for the photoelectric phase modulator, so that the change trends of the refractive indexes of the photoelectric phase modulator are relatively consistent, the threshold of the stimulated Brillouin scattering effect is improved, and the laser amplification efficiency and the laser synthesis efficiency are improved.
The digital broadband adjustable microwave noise source 2 generates Gaussian white noise by means of a conversion method, a rejection method, a recursion method and the like, and is combined with a hardware circuit of the digital broadband adjustable microwave noise source 2 to monitor the frequency spectrum characteristic of an output signal RFB, adjust the amplitude distribution of the Gaussian white noise, realize spectrum shaping, improve the in-band flatness of an output spectrum, and improve the laser amplification efficiency and the synthesis efficiency.
The digital broadband adjustable microwave noise source 2 produces a required waveform through matlab, stores the waveform into a memory, combines with an FPGA and a DAC to realize the generation, storage, playback and digital-to-analog conversion of high-flatness Gaussian white noise and then outputs the Gaussian white noise, and provides a specified modulation signal for the photoelectric phase modulator in a playback mode to meet different customer requirements.
The digital broadband adjustable microwave noise source 2 generates a required waveform in the FPGA through an algorithm, and outputs the waveform after digital-to-analog conversion through the DAC, so that a modulation signal which can be edited and diversified on line is provided for the photoelectric phase modulator in a real-time generation mode, spectrum shaping is realized, and laser amplification efficiency and synthesis efficiency are improved.
The radio frequency working frequency range of the photoelectric phase modulator 3 is larger than the working frequency range output by the digital broadband adjustable microwave noise source 2, so that the radio frequency signals RFB output by the digital broadband adjustable microwave noise source 2 are ensured to participate in signal modulation.
By monitoring the signal output by the digital broadband adjustable microwave noise source 2, a compensation coefficient is formulated, and the generated waveform is corrected in real time, the output of a high-flatness Gaussian white noise signal is realized, and the laser amplification efficiency and the synthesis efficiency are improved.
Firstly, an equalizer is adopted to substantially equalize the frequency spectrum characteristics of the digital broadband adjustable microwave noise source 2 which are monotonically decreased or monotonically increased into a horizontal or wavy frequency spectrum, and then the generated waveform is modified to accurately adjust the in-band flatness of the output so as to reduce the design difficulty and improve the production efficiency.
The digital broadband adjustable microwave noise source 2 adopts an automatic gain control mode to improve the environmental adaptability, achieve the aims of accurately controlling the central wavelength and the spectrum broadening of an output spectrum, improve the stability of the output spectrum of the digital spectrum controllable laser seed source and improve the reliability of an optical fiber amplification system.
Claims (10)
1. A controllable laser seed source of digital spectrum which characterized in that: the system comprises a DFB laser driving module, a digital broadband adjustable microwave noise source and a photoelectric phase modulator, wherein the output ends of the DFB laser driving module and the digital broadband adjustable microwave noise source are connected with the input end of the photoelectric phase modulator, and the output end of the photoelectric phase modulator is used for seed source spectrum output.
2. The digitally spectrally controllable laser seed source of claim 1, wherein: the DFB laser driving module mainly comprises a master control unit and a DFB laser, wherein the master control unit comprises a communication control circuit, a power supply circuit, a power drive circuit, a temperature control circuit and a driving circuit; the communication control circuit comprises a serial communication interface for communicating with the outside, and the serial communication and power supply are realized through the serial communication interface; the communication control circuit controls the power supply circuit to output working power supplies required by circuits such as DFB laser drive, power drive, temperature control, drive circuit and the like; the communication control circuit controls power drive, temperature control and a drive circuit, and realizes control of the center wavelength and the output power of the DFB laser.
3. The digitally spectrally controllable laser seed source of claim 1, wherein: the digital broadband adjustable microwave noise source mainly comprises a digital noise source generating circuit, a band-pass filter, a gain adjusting/equalizing/amplifying circuit, a low-pass filter, a coupler and a wave detector; the digital noise source generating circuit mainly comprises an FPGA, a memory, a clock chip, a DAC, a power supply unit and a microprocessing unit MCU; the gain adjusting/equalizing/amplifying circuit mainly comprises a numerical control attenuator, an equalizer and an amplifier.
4. A digital spectrally controllable laser seed source as claimed in claim 3, wherein: the general control unit of the DFB laser driving module is connected with the DFB laser, the digital noise source generating circuit of the digital broadband adjustable microwave noise source and the gain adjusting/equalizing/amplifying circuit in a control way; after external communication control information passes through a master control unit of the DFB laser driving module, controlling the DFB laser to output a laser signal; simultaneously controlling a digital noise source generating circuit in the digital broadband adjustable microwave noise source to generate a broadband adjustable radio frequency signal RFA; then controlling a gain adjusting/equalizing/amplifying circuit in the digital broadband adjustable microwave noise source, and carrying out gain adjustment, equalization and amplification on a broadband adjustable radio frequency signal RFA after the RFA passes through a band-pass filter; the broadband adjustable radio frequency signal RFA sequentially passes through a band-pass filter, a numerical control attenuator, an equalizer, an amplifier, a low-pass filter and a coupler and then outputs a coupling signal and a through signal, wherein the coupling signal passes through a wave detector and then outputs detection information which is transmitted back to the digital noise source generating circuit and information is reported through a master control unit in the DFB laser driving module, and the other through signal RFB and a laser signal output by the DFB laser output a laser signal after being widened after passing through the photoelectric phase modulator and serve as seed source light to be output.
5. The digitally spectrally controllable laser seed source of claim 1, wherein: and an external control and power supply is input through the serial port communication and power supply A of the DFB laser driving module, and respectively outputs various voltages, control codes required by communication, control information of power control and temperature control and control information required by a driving circuit after being processed by the power supply after passing through the master control unit, and controls the DFB laser to output a spectrum containing a central wavelength and output optical power.
6. The digitally spectrally controllable laser seed source of claim 1, wherein: the digital broadband adjustable microwave noise source generates or reads signals stored in a memory according to an FPGA, the memory, a clock chip, a power supply unit and a microprocessing unit MCU, and outputs a low-power broadband adjustable radio-frequency signal RFA after passing through a high-speed DAC, the broadband adjustable radio-frequency signal RFA outputs a high-power radio-frequency signal RFB after passing through a gain adjusting/equalizing/amplifying circuit and a low-pass filter, and the high-power radio-frequency signal RFB is used as the radio-frequency input of a photoelectric phase modulator and is used as a modulation signal to provide enough half-wave voltage for the photoelectric phase modulator.
7. The digitally spectrally controllable laser seed source of claim 1, wherein: the digital broadband adjustable microwave noise source detects the output power values at different temperatures through the coupler and the detector, and controls the numerical control attenuator through the FPGA, so that the digital broadband adjustable microwave noise source outputs the same power value in different environments.
8. The digital spectrally controllable laser seed source of claim 1, wherein: the digital broadband adjustable microwave noise source adjusts the amplitude-frequency characteristics of the generated or stored waveform according to the output in-band flatness of the high-power radio frequency signal RFB, and improves the in-band flatness; according to the system requirement, the output power of the high-power radio frequency signal RFB is adjusted by adjusting the attenuation value of the numerical control attenuator, so that the spectrum is controllable; and modifying the spectral broadening, waveform edges, spectral shape and in-band flatness characteristics of the output by editing the generated or stored waveform form.
9. The digitally spectrally controllable laser seed source of claim 1, wherein: the Gaussian white noise generated by the digital broadband adjustable microwave noise source is combined with a hardware circuit of the digital broadband adjustable microwave noise source to adjust the amplitude distribution of the Gaussian white noise.
10. The digitally spectrally controllable laser seed source of claim 1, wherein: the digital broadband adjustable microwave noise source generates Gaussian white noise by a conversion method, a rejection method and a recursion method, monitors the spectral characteristics of an output signal RFB of the digital broadband adjustable microwave noise source by combining a hardware circuit of the digital broadband adjustable microwave noise source, adjusts the amplitude distribution of the Gaussian white noise and realizes spectrum shaping;
the digital broadband adjustable microwave noise source produces a required waveform through matlab, stores the waveform into a memory, and then combines with an FPGA and a DAC to realize generation, storage, playback and digital-to-analog conversion of high-flatness Gaussian white noise and output;
the digital broadband adjustable microwave noise source generates a required waveform in the FPGA through an algorithm, and then realizes digital-to-analog conversion and output through the DAC;
the radio frequency working frequency range of the photoelectric phase modulator is larger than the working frequency range of the digital broadband adjustable microwave noise source output;
firstly, an equalizer is adopted to substantially equalize the frequency spectrum characteristics of the digital broadband adjustable microwave noise source which are monotonically decreased or monotonically increased into a horizontal or wavy frequency spectrum, and then the flatness in an output band is accurately adjusted by modifying the generated waveform;
the digital broadband adjustable microwave noise source improves the environmental adaptability by adopting an automatic gain control mode and improves the stability of the output spectrum of the digital spectrum controllable laser seed source.
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