CN210780814U - Microwave signal frequency doubling device based on double parallel Mach-Zehnder modulator - Google Patents
Microwave signal frequency doubling device based on double parallel Mach-Zehnder modulator Download PDFInfo
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- CN210780814U CN210780814U CN202020081581.7U CN202020081581U CN210780814U CN 210780814 U CN210780814 U CN 210780814U CN 202020081581 U CN202020081581 U CN 202020081581U CN 210780814 U CN210780814 U CN 210780814U
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Abstract
The utility model discloses a microwave signal frequency doubling device based on two parallel mach-zehnder modulators, including light end equipment and electric end equipment, constitute the major loop respectively and follow the loop by light end equipment and electric end equipment. The optical signal is divided into three paths after passing through the optical end equipment, and the first path is fed back to a radio frequency input end of the optical end equipment through a main loop formed by the electrical end equipment and the optical end equipment; the second path is fed back to the other radio frequency input end of the optical end equipment from a loop formed by the electric end equipment and the optical end equipment, and a frequency doubling signal and a frequency quadrupling signal of the fundamental frequency signal are obtained at a radio frequency output port of the optical end equipment. The device adopts the microwave photon technology, breaks through the bandwidth limitation of the conventional electronic scheme, and has the advantages of simple structure, low cost and stable performance.
Description
Technical Field
The utility model relates to a microwave photon technical field, in particular to microwave signal frequency doubling device based on two parallel mach-zehnder modulators.
Background
In recent years, with the continuous expansion of communication networks, radio over fiber (RoF) is used as a technology for combining optical fibers and microwaves, and has excellent characteristics of low loss, ultra wide band, electromagnetic interference resistance and the like, so that a reliable solution is provided for solving the next generation of ultra wide band wireless access, high-quality high-frequency microwave signal generation is one of key technologies for realizing radio over fiber (RoF), and the radio over fiber (RoF) has attracted extensive attention due to the characteristics of low loss, high bandwidth, low cost and the like. A high-performance high-frequency signal source is an important component of a RoF system, and a traditional electronic method is limited by materials and processes and is difficult to realize the generation of high-frequency microwave signals. The microwave photon method has transparent bandwidth and low loss, can be perfectly connected with the RoF system, does not need a secondary electro-optical conversion process, reduces the system cost and improves the use efficiency.
The microwave photon method realizes high-frequency microwave signals and comprises schemes of a light injection locking method, a modulator frequency multiplication method, a photoelectric oscillator and the like, wherein the modulator frequency multiplication and the photoelectric oscillator technologies are widely concerned because of high stability and low phase noise characteristics, but the modulator frequency multiplication technology obviously deteriorates phase noise of output signals, the frequency stability of microwave signals generated by the photoelectric oscillator is poor, and the two schemes are difficult to meet the requirements of the RoF technology on high performance and high stability of signal sources. In order to generate a high-stability, low-phase-noise rf signal, a new principle and method need to be proposed.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the problems of the prior art, the present invention provides a microwave signal frequency doubling device based on a dual parallel mach-zehnder modulator, which relies on a dual ring structure optoelectronic oscillator formed by photonic devices such as a semiconductor laser, a dual parallel mach-zehnder electro-optic intensity modulator, a radio frequency filter, and a photodetector, and can effectively and simultaneously generate frequency doubling and frequency quadrupling microwave signals without an additional radio frequency signal source by controlling the operating state of the dual parallel mach-zehnder modulator.
The utility model discloses a microwave signal frequency doubling device based on two parallel mach-zehnder modulators, including semiconductor laser (1), polarization controller (2), two parallel mach-zehnder electro-optic intensity modulators (3), major loop and follow loop;
the input ends of the semiconductor laser (1), the polarization controller (2) and the double parallel Mach-Zehnder electro-optic intensity modulator (3) are sequentially connected;
the main loop is formed by sequentially connecting the output end of a double-parallel Mach-Zehnder electro-optic intensity modulator (3), a single-mode optical fiber (4), an optical beam splitter (5), a first photoelectric detector (6), a radio frequency power divider (7), a first radio frequency amplifier (8), a radio frequency filter (9), a low noise amplifier (10) and the first radio frequency input end of the double-parallel Mach-Zehnder electro-optic intensity modulator (3);
the slave loop is formed by sequentially connecting the output end of a double parallel Mach-Zehnder electro-optic intensity modulator (3), a single-mode optical fiber (4), an optical beam splitter (5), a second photoelectric detector (11), a second radio frequency amplifier (12) and a second radio frequency input end of the double parallel Mach-Zehnder electro-optic intensity modulator (3).
Furthermore, the optical beam splitter (5) is respectively connected with the input end of the first photoelectric detector (6) and the input end of the second photoelectric detector (11) through optical fibers.
Furthermore, the optical beam splitter (5) adopts a 1:1:1 three-path optical beam splitter.
Further, the radio frequency power divider (7) adopts a 50:50 radio frequency power divider.
Furthermore, the first photoelectric detector (6) and the second photoelectric detector (11) adopt photoelectric detectors with working bandwidths larger than 40 GHz.
Furthermore, the radio frequency filter (9) is an adjustable narrow-band filter.
Furthermore, the low noise amplifier (10) adopts a gain of 20dB, and the noise coefficient is less than 4 dB.
The utility model discloses compare with traditional modulator frequency multiplication technique, traditional modulator frequency multiplication technique is subject to the phase characteristic of radio frequency signal source, and when the phase place of signal source changed, the frequency multiplication characteristic of system will change thereupon. The utility model discloses a control series connection electro-optic intensity modulator's operating condition has reduced the dependence of microwave photon doubling of frequency system to the radio frequency signal phase place, selects the fundamental frequency through radio frequency filter in the main loop, need not the additional signal source and can effectively produce frequency doubling and frequency quadruple signal. The method adopts the microwave photon technology, breaks through the bandwidth limitation of the conventional electronic scheme, and realizes the simple structure, lower cost and stable performance of the device.
Drawings
Fig. 1 is a schematic block diagram of a microwave signal frequency doubling device based on a dual parallel mach-zehnder modulator according to the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example one
The high-performance high-frequency signal source is an important component of an optical carrier wireless communication system, and the traditional electronic method is limited by materials and processes and is difficult to realize the generation of high-frequency microwave signals. The microwave photon method has transparent bandwidth and low loss, can be perfectly connected with the RoF system, does not need a secondary electro-optical conversion process, reduces the system cost and improves the use efficiency. Both the electro-optical modulator frequency multiplication scheme and the photoelectric oscillator technology can generate high-frequency microwave signals, but the electro-optical modulator frequency multiplication scheme can obviously deteriorate phase noise of output signals, the frequency stability of the microwave signals generated by the photoelectric oscillator is poor, and the requirements of an optical wireless communication system on high performance and high stability of signal sources are difficult to meet at present.
The embodiment provides a microwave signal frequency doubling device based on a double-parallel Mach-Zehnder modulator, and as shown in FIG. 1, the device comprises a semiconductor laser (1), a polarization controller (2), a double-parallel Mach-Zehnder electro-optic intensity modulator (3), a single-mode optical fiber (4), an optical beam splitter (5), a first photoelectric detector (6), a radio frequency power divider (7), a first radio frequency amplifier (8), a radio frequency filter (9), a low-noise amplifier (10), a second photoelectric detector (11) and a second radio frequency amplifier (12).
In the present embodiment, the type of the device is as follows, but the type should not be limited thereto, and the present invention should not be construed as being limited to the scope of the present invention.
The semiconductor laser (1) adopts a semiconductor laser with the wavelength of 1550nm, the polarization controller (2) adopts a three-axis mechanical adjustable polarization controller, the working bandwidth of the double parallel Mach-Zehnder electro-optic intensity modulator (3) is 40GHz, the single-mode optical fiber (4) adopts a G.652 standard single-mode optical fiber, the optical beam splitter (5) adopts a three-way optical beam splitter with the ratio of 1:1:1, the first photoelectric detector (6) and the second photoelectric detector (11) adopt photoelectric detectors with the working bandwidth larger than 40GHz, the radio-frequency power splitter (7) adopts a radio-frequency power splitter with the ratio of 50:50 and a first radio-frequency amplifier (8), the second radio frequency amplifier (12) adopts a power amplifier with the maximum output power larger than 1W, the radio frequency filter (9) is an adjustable narrow-band filter, the low noise amplifier (10) adopts a gain of 20dB, and the noise coefficient is smaller than 4 dB.
The utility model discloses a microwave signal frequency doubling device can divide into optical terminal equipment and electric terminal equipment, wherein:
in the optical terminal equipment, a semiconductor laser (1), a polarization controller (2), a double parallel Mach-Zehnder electro-optic intensity modulator (3), a single-mode optical fiber (4) and an optical beam splitter (5) are sequentially connected, and a first output end and a second output end of the optical beam splitter (5) are respectively connected with an input end of a first photoelectric detector (6) and an input end of a second photoelectric detector (11) through optical fibers;
in the electric end equipment, a radio frequency power divider (7), a first radio frequency amplifier (8), a radio frequency filter (9) and a low noise amplifier (10) are sequentially connected with the second input end of a double parallel Mach-Zehnder electro-optic intensity modulator (3), and the output end of a first photoelectric detector (6) is connected with the input end of the radio frequency power divider (7) to form a main loop of a photoelectric oscillator. The output end of the second radio frequency amplifier (12) is connected with the third input end of the double parallel Mach-Zehnder electro-optic intensity modulator (3), and the output end of the second photoelectric detector (11) is connected with the input end of the second radio frequency amplifier (12) to form a slave loop of the photoelectric oscillator.
The frequency doubling device realizes the simultaneous stable output of frequency doubling and frequency quadrupling signals by controlling the working state of the double parallel Mach-Zehnder electro-optic intensity modulator (3) based on two parts of an optical end and an electrical end, and effectively reduces the phase noise of the output signals by utilizing an electro-optic oscillation loop. The working state control of the photoelectric oscillation ring cavity and the electro-optical intensity modulator is combined, and low-phase noise frequency-doubled and frequency-quadrupled signals can be output. The working principle is as follows:
an optical signal emitted by the semiconductor laser (1) is sent to a first input end of a double parallel Mach-Zehnder electro-optic intensity modulator (3) through a polarization controller (2), the first input end is an optical signal input port, and a second input end and a third input end are radio frequency input ports. The double-parallel Mach-Zehnder electro-optic intensity modulator can simultaneously modulate electric signals input from the two radio frequency input ports, then an adjustable phase difference is added between the modulated signals, and the modulated signals are divided into three paths after passing through the single-mode long optical fiber (4) and the optical splitter (5). The main loop obtains a fundamental frequency signal and a plurality of harmonic signals thereof through the beat frequency of the first photoelectric detector (6), obtains a purer fundamental frequency signal at the output port of the radio frequency filter (9) through the amplification of the first radio frequency amplifier (8) and the filtering of the radio frequency filter (9), and the fundamental frequency signal is fed back to a radio frequency input port (namely a second input port) of the double-parallel Mach-Zehnder electro-optic intensity modulator (3) after being amplified by the low-noise amplifier (10). And a signal detected by the second photoelectric detector (11) in the slave loop is amplified by a second radio frequency amplifier (12), fed back and input to the other radio frequency input port (namely a third input port) of the double-parallel Mach-Zehnder electro-optic intensity modulator (3), and after mode competition, a double-frequency signal of a fundamental frequency signal occupies main power distribution in the slave loop by using the second radio frequency amplifier (12). And adjusting the bias voltage to enable the upper and lower sub-modulators of the double parallel Mach-Zehnder electro-optic intensity modulator (3) to work at the minimum bias point, so that the carrier wave is suppressed, and the main modulator generates a phase difference of 90 degrees between the upper and lower sub-modulators. Therefore, the frequency difference between the positive and negative first-order sidebands and the carrier of the modulated optical signal in the lower modulator of the double-parallel Mach-Zehnder electro-optic intensity modulator (3) is equal to the fundamental frequency of the radio frequency, the frequency difference between the positive and negative first-order sidebands and the carrier of the optical signal in the upper modulator of the double-parallel Mach-Zehnder electro-optic intensity modulator (3) is equal to the double frequency of the fundamental frequency, and 90-degree phase difference exists between the frequency difference and the main ring, so that the double frequency and quadruple frequency signals of the fundamental frequency signal can be obtained at a radio frequency output port simultaneously.
Example two
The embodiment provides a microwave signal frequency doubling method, which is implemented by the apparatus of the first embodiment, and the implementation process is as follows:
s1, sending the optical signal sent by the semiconductor laser (1) to the optical signal input port of the double parallel Mach-Zehnder electro-optic intensity modulator (3) through the polarization controller (2);
s2, modulating the electric signals input by the two radio frequency input ports by the double parallel Mach-Zehnder electro-optic intensity modulator (3), adding an adjustable phase difference between the two modulated electric signals, and dividing the modulated signals into three paths after passing through the single-mode long optical fiber (4) and the optical splitter (5);
s3, feeding the first path back to a radio frequency input port of the double parallel Mach-Zehnder electro-optic intensity modulator (3) after passing through the main loop; the second path is fed back to the other radio frequency input port of the double parallel Mach-Zehnder electro-optic intensity modulator (3) through a loop; a third path of output optical signal;
s4, adjusting bias voltage to make the upper and lower sub-modulators of the double parallel Mach-Zehnder electro-optic intensity modulator (3) work at the minimum bias point, and the carrier wave is suppressed to make the main modulator generate a phase difference of 90 degrees between the upper and lower sub-modulators;
and S5, obtaining the frequency doubling and frequency quadrupling signals of the base frequency signal at the radio frequency output port simultaneously.
Furthermore, the frequency difference between the positive and negative first-order sidebands and the carrier wave of the modulated optical signal in the lower modulator of the double parallel Mach-Zehnder electro-optic intensity modulator (3) is equal to the fundamental frequency of the radio frequency.
Furthermore, the frequency difference between the positive and negative first-order sidebands of the optical signal in the upper modulator of the double-parallel Mach-Zehnder electro-optic intensity modulator (3) and the carrier wave is equal to the double frequency of the fundamental frequency, and the phase difference is 90 degrees with the main loop.
The above description is for illustrative purposes only and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. that do not depart from the spirit and principles of the present invention should be construed as within the scope of the present invention.
Claims (7)
1. Microwave signal frequency doubling device based on two parallel mach-zehnder modulators is characterized in that: the device comprises a semiconductor laser (1), a polarization controller (2), a double parallel Mach-Zehnder electro-optic intensity modulator (3), a main loop and a slave loop;
the input ends of the semiconductor laser (1), the polarization controller (2) and the double parallel Mach-Zehnder electro-optic intensity modulator (3) are sequentially connected;
the main loop is formed by sequentially connecting the output end of a double-parallel Mach-Zehnder electro-optic intensity modulator (3), a single-mode optical fiber (4), an optical beam splitter (5), a first photoelectric detector (6), a radio frequency power divider (7), a first radio frequency amplifier (8), a radio frequency filter (9), a low noise amplifier (10) and the first radio frequency input end of the double-parallel Mach-Zehnder electro-optic intensity modulator (3);
the slave loop is formed by sequentially connecting the output end of a double parallel Mach-Zehnder electro-optic intensity modulator (3), a single-mode optical fiber (4), an optical beam splitter (5), a second photoelectric detector (11), a second radio frequency amplifier (12) and a second radio frequency input end of the double parallel Mach-Zehnder electro-optic intensity modulator (3).
2. The microwave signal frequency doubling device based on the double parallel Mach-Zehnder modulator of claim 1, characterized in that: the optical beam splitter (5) is respectively connected with the input end of the first photoelectric detector (6) and the input end of the second photoelectric detector (11) through optical fibers.
3. The microwave signal frequency doubling device based on the double parallel Mach-Zehnder modulator of claim 1, characterized in that: the optical beam splitter (5) adopts a 1:1:1 three-path optical beam splitter.
4. The microwave signal frequency doubling device based on the double parallel Mach-Zehnder modulator of claim 1, characterized in that: the radio frequency power divider (7) adopts a 50:50 radio frequency power divider.
5. The microwave signal frequency doubling device based on the double parallel Mach-Zehnder modulator of claim 1, characterized in that: the first photoelectric detector (6) and the second photoelectric detector (11) adopt photoelectric detectors with working bandwidths larger than 40 GHz.
6. The microwave signal frequency doubling device based on the double parallel Mach-Zehnder modulator of claim 1, characterized in that: the radio frequency filter (9) is an adjustable narrow-band filter.
7. The microwave signal frequency doubling device based on the double parallel Mach-Zehnder modulator of claim 1, characterized in that: the low noise amplifier (10) adopts gain of 20dB, and the noise coefficient is less than 4 dB.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114448518A (en) * | 2020-11-04 | 2022-05-06 | 西安电子科技大学 | Method for detecting optical carrier radio frequency link with low complexity coherence |
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| CN114448518A (en) * | 2020-11-04 | 2022-05-06 | 西安电子科技大学 | Method for detecting optical carrier radio frequency link with low complexity coherence |
| CN114448518B (en) * | 2020-11-04 | 2024-01-30 | 西安电子科技大学 | Method for coherently detecting optical carrier radio frequency link with low complexity |
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