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CN119966353A - A low phase noise frequency multiplication source - Google Patents

A low phase noise frequency multiplication source Download PDF

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Publication number
CN119966353A
CN119966353A CN202411968244.9A CN202411968244A CN119966353A CN 119966353 A CN119966353 A CN 119966353A CN 202411968244 A CN202411968244 A CN 202411968244A CN 119966353 A CN119966353 A CN 119966353A
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signal
output
filter
mzm
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朱玺
黄凯
张彬彬
陈妍君
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Beijing Institute of Radio Metrology and Measurement
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Beijing Institute of Radio Metrology and Measurement
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention discloses a low-phase noise frequency multiplication source which comprises a laser, a first optical fiber coupler, an MZM, a second optical fiber coupler, an optical fiber, a detector, a power divider, a first filter, a second filter, a microwave source and a frequency feedback control part, wherein the laser is connected with a first input port of the first optical fiber coupler, an output port of the first optical fiber coupler is connected with the MZM, the MZM is connected with an input port of the second optical fiber coupler, the second optical fiber coupler is provided with two output ports, the first output port is connected with the detector, the second output port is connected with the optical fiber, the optical fiber is connected with a second input port of the first optical fiber coupler, the detector is connected with the power divider, a first output port of the power divider is connected with the first filter, and the first filter is connected with an input port of a mixer.

Description

Low phase noise frequency multiplication source
Technical Field
The invention relates to the technical field of microwaves, in particular to a low-phase noise frequency doubling source.
Background
In applications such as radar and radio astronomy, the requirements for phase noise and short-term frequency stability of microwaves and millimeter waves are raised. In the prior art, a microwave oscillator or a method of synthesizing a low-noise microwave signal is generally adopted, and then the low-phase noise microwave signal and the millimeter wave signal are obtained through a method of multiplying the frequency of the low-noise microwave signal. The Q value of the traditional microwave oscillator is difficult to reach a higher index at a high resonance frequency, and the traditional method for synthesizing the microwave signal has a plurality of limitations due to the problems of electronic bottleneck effect of electronic devices and the like. Therefore, the phase noise index of the microwave signal generated by the traditional method is poor, and the phase noise of the microwave or millimeter wave signal obtained by the frequency multiplication scheme cannot reach a higher level.
Disclosure of Invention
The invention provides the following technical scheme:
The specification provides a low-phase noise frequency multiplication source, which comprises a laser, a first optical fiber coupler, an MZM, a second optical fiber coupler, an optical fiber, a detector, a power divider, a first filter, a second filter, a microwave source and a frequency feedback control part, wherein the laser is connected with a first input port of the first optical fiber coupler, an output port of the first optical fiber coupler is connected with the MZM, the MZM is connected with an input port of the second optical fiber coupler, the second optical fiber coupler is provided with two output ports, the first output port is connected with the detector, the second output port is connected with the optical fiber, the optical fiber is connected with a second input port of the first optical fiber coupler, the detector is connected with the power divider, a first output port of the power divider is connected with the first filter, the first filter is connected with an input port of the mixer, a second output port of the power divider is connected with the second filter, a second output port of the second filter is connected with an input port of the phase-locked phase shifter, a phase-locked loop is connected with an output port of the phase-locked loop, an output port of the phase-locked loop is connected with an input port of the phase-locked loop.
Drawings
FIG. 1 is a schematic diagram of a low phase noise frequency doubling source according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a low phase noise frequency doubling source according to an embodiment of the present invention.
The reference sign is 1 a laser, 2a first optical fiber coupler, 3 a MZM, 4 a second optical fiber coupler, 5 a detector, 6a power divider, 7 a first filter, 8 a microwave source, a frequency feedback control part, 9 an optical fiber and 10 a second filter.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present specification more apparent, the technical solutions of the present specification will be clearly and completely described below with reference to specific embodiments of the present specification and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present specification. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present disclosure.
As used herein, the term "comprising" and its various alternatives are to be understood as open-ended terms, meaning "including, but not limited to," and the term "one embodiment" is to be understood as "at least one embodiment.
Example 1
The application provides a low-phase noise frequency doubling source, which utilizes a Mach-Zehnder modulator (MZM) to modulate a microwave signal onto a laser signal, biases the MZM at a minimum transmission point, utilizes an optical fiber link to form a loop, and transmits an optical signal in the loop for multiple times, thereby realizing multistage frequency doubling, and realizing frequency-tunable frequency doubling output signals by adjusting the frequency of the microwave signal.
The low-phase noise frequency doubling source comprises a laser, a first optical fiber coupler, an MZM, a second optical fiber coupler, an optical fiber, a detector, a power divider, a first filter, a second filter, a microwave source and a frequency feedback control part. The laser is connected with a first input port of the first optical fiber coupler, an output port of the first optical fiber coupler is connected with the MZM, the MZM is connected with an input port of the second optical fiber coupler, the second optical fiber coupler is provided with two output ports, wherein the first output port is connected with the detector, the second output port is connected with the optical fiber, the optical fiber is connected with a second input port of the first optical fiber coupler, the detector is connected with the power divider, a first output port of the power divider is connected with the first filter, the first filter is connected with an input port of the mixer, a second output port of the power divider is connected with the second filter for frequency multiplication signal output, a first output port of the microwave source is connected with an input port of the frequency multiplier, an output port of the frequency multiplier is connected with an input port of the voltage-controlled mixer, an output port of the frequency mixer is connected with an input port of the voltage-controlled loop, an output port of the phase-locked loop is connected with an output port of the phase-locked loop, and an output of the phase-shifted phase of the phase is connected with an input of the phase-shifted phase of the phase-frequency-modulated device.
The method comprises the steps that a microwave signal with the frequency of f m is modulated onto a laser signal by using an MZM, the MZM is biased at a minimum transmission point, the output of the MZM is the spectrum of a suppressed carrier, only two first-order optical sidebands with the optical carrier interval of f m are generated, a loop is formed by using an optical fiber link, one part of the optical signal is beaten by a detector, the other part of the optical signal is injected into the MZM again, two optical sidebands with the optical carrier interval of 2f m are generated, the two optical sidebands can generate a microwave millimeter wave signal with the frequency of 4f m by the beat frequency of the detector, a part of the optical signal passes through the detector and passes through a filter, a signal with the frequency of 4f m is used for feedback control of the phase of a modulated signal, the other part of the optical signal continues to be transmitted in the loop, the signal with the frequency of (2n+2) f m is filtered and then output, and n is the number of times of passing through the MZM, and n is more than or equal to 2.
The feedback control method includes, but is not limited to, using a voltage-controlled phase shifter, etc., and can also directly feedback control the output frequency of the microwave source.
An optical amplifier may be added to the optical path.
Example two
The specific implementation mode of the low-phase noise frequency multiplication source is shown in fig. 2, and comprises a laser 1, a first optical fiber coupler 2, an MZM 3, a second optical fiber coupler 4, a detector 5, a power divider 6, a first filter 7, a mixer 8, a phase-locked loop 9, a microwave source 10, a voltage-controlled phase shifter 11, a frequency multiplier 12, an optical fiber 13 and a second filter 14.
In this embodiment, the microwave source and the frequency feedback control portion are composed of a mixer 8, a phase-locked loop 9, a microwave source 10, a voltage-controlled phase shifter 11, and a frequency multiplier 12, where the connection mode is that the first filter 7 is connected with an input port of the mixer 8, a first output port of the microwave source 10 is connected with an input port of the frequency multiplier 12, an output port of the frequency multiplier 12 is connected with an input port of the mixer 8, an output port of the mixer 8 is connected with an input port of the phase-locked loop 9, an output port of the phase-locked loop 9 is connected with a voltage-controlled input end of the voltage-controlled phase shifter 11, a second output port of the microwave source 10 is connected with a radio frequency input end of the voltage-controlled phase shifter 11, and an output port of the voltage-controlled phase shifter 11 is connected with a radio frequency input port of the MZM 3.
In this embodiment, the output light wavelength of the laser 1 is preferably 1550nm.
In this embodiment, the splitting ratio of the first optical fiber coupler 2 is 50:50, and the splitting ratio of the second optical fiber coupler 4 is 20:80, wherein 20% of the optical signal is injected into the detector, and 80% of the light is injected into the first optical fiber coupler 2 after passing through the optical fiber.
In this embodiment, the output frequency of the microwave source 10 is preferably 2GHz, the microwave source is modulated onto a laser signal through the MZM3 after passing through the voltage-controlled phase shifter, the MZM is biased at the minimum transmission point, only two first-order optical sidebands with an optical carrier spacing of 2GHz are generated, the modulated optical signal is injected into the MZM again after passing through the optical fiber, after modulating again, part of the optical signal enters the detector, a microwave signal is output, and the signal with the frequency of 8GHz is extracted through the first filter 7 for the feedback control of the microwave signal so as to improve the phase noise of the finally output frequency multiplication signal.
In this embodiment, the frequency multiplier 12 is a 4-frequency multiplier, multiplies the frequency of 2GHz output by the microwave source to 8GHz, mixes with the 8GHz signal output by the first filter 7, and the difference frequency signal is feedback-controlled by the phase-locked loop to control the voltage-controlled phase shifter, so as to optimize the phase noise index of the final output frequency-multiplied signal.
The optical fiber 13 is preferably 5km in length and is a single-mode optical fiber in consideration of transmission loss and the like.
The coverage of the output frequency of the photodetector 5 includes the center frequencies of the first filter 7 and the second filter 14, and in this embodiment, the detection bandwidth of the photodetector 5 is selected to be 50GHz.
The center frequency of the second filter 14 may be selected to be (2n+2) ×2GHz, where n is the number of passes through the MZM, and n is equal to or greater than 2. In this embodiment, the center frequency of the second filter 14 is selected to be 16GHz, i.e., n is 3. By replacing the second filter 14, a different frequency output can be achieved. By adjusting the output frequency of the microwave source 10, it is achieved that the frequency of the final output 16GHz signal is adjustable around the centre frequency. Through testing, the phase noise index of the output 16GHz signal is-151 dBc/Hz@10kHz.
In summary, in the embodiment of the invention, the low-phase noise frequency multiplication source realizes frequency expansion by utilizing a photoelectric combination method, utilizes the advantages of optical fiber low loss and the like, combines the technologies of electro-optic modulation and the like, and generates microwave and millimeter wave signals with the advantages of larger tunable range, stable phase and the like, optimizes the phase noise of the frequency multiplication output signal through frequency feedback control, and can realize frequency tunability of the frequency multiplication output signal through adjusting the output frequency of the frequency source.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (5)

1.一种低相位噪声倍频源，其特征在于，包括激光器、第一光纤耦合器、MZM、第二光纤耦合器、光纤、探测器、功分器、第一滤波器、第二滤波器、微波源及频率反馈控制部分；其中，所述激光器与所述第一光纤耦合器的第一输入端口连接，所述第一光纤耦合器的输出端口与所述MZM连接，所述MZM与所述第二光纤耦合器的输入端口连接，所述第二光纤耦合器有两个输出端口，其中，第一输出端口与所述探测器连接，第二输出端口与所述光纤连接，所述光纤与所述第一光纤耦合器的第二输入端口连接，所述探测器与所述功分器连接，所述功分器的第一输出端口与所述第一滤波器连接，所述第一滤波器与所述混频器的输入端口连接，所述功分器的第二输出端口与所述第二滤波器连接，用于倍频信号输出，所述微波源的第一输出端口与所述倍频器的输入端口连接，所述倍频器的输出端口与所述混频器的输入端口连接，所述混频器的输出端口与所述锁相环的输入端口连接，所述锁相环的输出端口与所述压控移相器的压控输入端链接，所述微波源的第二输出端口与所述压控移相器的射频输入端连接，所述压控移相器的输出端口与所述MZM的射频输入端口连接。1. A low phase noise frequency doubling source, characterized in that it comprises a laser, a first fiber coupler, an MZM, a second fiber coupler, an optical fiber, a detector, a power divider, a first filter, a second filter, a microwave source and a frequency feedback control part; wherein the laser is connected to the first input port of the first fiber coupler, the output port of the first fiber coupler is connected to the MZM, the MZM is connected to the input port of the second fiber coupler, the second fiber coupler has two output ports, wherein the first output port is connected to the detector, the second output port is connected to the optical fiber, the optical fiber is connected to the second input port of the first fiber coupler, the detector is connected to the power divider The first output port of the power divider is connected to the first filter, the first filter is connected to the input port of the mixer, the second output port of the power divider is connected to the second filter for outputting a frequency doubled signal, the first output port of the microwave source is connected to the input port of the frequency doubler, the output port of the frequency doubler is connected to the input port of the mixer, the output port of the mixer is connected to the input port of the phase-locked loop, the output port of the phase-locked loop is linked to the voltage-controlled input end of the voltage-controlled phase shifter, the second output port of the microwave source is connected to the RF input end of the voltage-controlled phase shifter, and the output port of the voltage-controlled phase shifter is connected to the RF input port of the MZM. 2.根据权利要求1所述的倍频源，其特征在于，利用MZM将频率为fm的微波信号调制到激光信号上，将MZM偏置在最小传输点，则MZM的输出为抑制载波的光谱，只生成与光载波间隔为fm的两个一阶光边带，利用光纤链路构成一个环路，一部分光信号经探测器拍频，另一部分光信号再次被注入MZM，将生成与光载波间隔为2fm的两个光边带，这两个光边带通过探测器拍频生成频率为4fm的微波毫米波信号，部分光信号经过探测器并经过滤波器后，输出频率为4fm的信号用于反馈控制调制信号相位，另一部分光信号继续在环路中传输，频率为(2n+2)fm的信号经滤波后输出，其中，n为经过MZM的次数，n≥2。2. The frequency doubling source according to claim 1 is characterized in that a microwave signal with a frequency of f m is modulated onto a laser signal by using MZM, and the MZM is biased at the minimum transmission point, so that the output of the MZM is a spectrum that suppresses the carrier, and only two first-order optical sidebands with a spacing of f m from the optical carrier are generated. A loop is formed by an optical fiber link, a part of the optical signal beats the frequency through the detector, and the other part of the optical signal is injected into the MZM again to generate two optical sidebands with a spacing of 2f m from the optical carrier. These two optical sidebands beat the frequency through the detector to generate a microwave millimeter wave signal with a frequency of 4f m . After part of the optical signal passes through the detector and the filter, a signal with a frequency of 4f m is output for feedback control of the phase of the modulation signal, and the other part of the optical signal continues to be transmitted in the loop, and a signal with a frequency of (2n+2)f m is output after filtering, wherein n is the number of times passing through the MZM, and n≥2. 3.根据权利要求1所述的倍频源，其特征在于，3. The frequency doubling source according to claim 1, characterized in that: 倍频器12为4倍频器，将微波源输出的2GHz倍频到8GHz，与经第一滤波器7输出的8GHz信号混频，差频信号经锁相环反馈控制压控移相器，优化最终输出倍频信号的相位噪声指标。The frequency multiplier 12 is a 4-frequency multiplier, which multiplies the 2 GHz output of the microwave source to 8 GHz, and mixes it with the 8 GHz signal output by the first filter 7. The difference frequency signal is fed back by a phase-locked loop to control the voltage-controlled phase shifter to optimize the phase noise index of the final output doubled frequency signal. 4.根据权利要求1所述的倍频源，其特征在于，4. The frequency doubling source according to claim 1, characterized in that: 所述光电探测器5的输出频率覆盖范围包括所述第一滤波器7和第二滤波器14的中心频率，在本实施例中，选择光电探测器5探测带宽为50GHz。The output frequency coverage range of the photodetector 5 includes the center frequencies of the first filter 7 and the second filter 14. In this embodiment, the detection bandwidth of the photodetector 5 is selected to be 50 GHz. 5.根据权利要求1所述的倍频源，其特征在于，5. The frequency doubling source according to claim 1, characterized in that: 所述第二滤波器14的中心频率选择(2n+2)×2GHz，其中，n为经过MZM的次数，n≥2；输出16GHz信号相位噪声指标为-151dBc/Hz@10kHz。The center frequency of the second filter 14 is selected as (2n+2)×2 GHz, where n is the number of times passing through the MZM, and n≥2; the output 16 GHz signal phase noise index is -151 dBc/Hz@10 kHz.
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