CN114039667A - Microwave optical subsystem with nonlinear distortion compensation frequency conversion phase shift function - Google Patents

Microwave optical subsystem with nonlinear distortion compensation frequency conversion phase shift function Download PDF

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CN114039667A
CN114039667A CN202111482866.7A CN202111482866A CN114039667A CN 114039667 A CN114039667 A CN 114039667A CN 202111482866 A CN202111482866 A CN 202111482866A CN 114039667 A CN114039667 A CN 114039667A
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frequency conversion
signal
optical
phase shift
mzm
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廖进昆
孔元
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University of Electronic Science and Technology of China
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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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • 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

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention belongs to the field of microwave photonics, and relates to an integrated technology for frequency conversion, shift and linearization processing of microwave signals. The link combination with only single function is improved to realize the integrated link with nonlinear distortion compensation and frequency conversion phase shift functions. The method plays a certain role in solving the problem that the single function cannot meet the requirement of modern communication transmission during actual signal transmission and processing.

Description

Microwave optical subsystem with nonlinear distortion compensation frequency conversion phase shift function
Technical Field
The invention belongs to the field of microwave photonics, and relates to an integrated technology for frequency conversion, shift and linearization processing of microwave signals.
Background
The microwave photon technology is widely applied to the fields of communication radars and the like, has almost no bandwidth limitation in optical domain transmission, and has the advantages of low-loss transmission, format transparent transmission, electromagnetic interference resistance, small weight, small volume and the like. Common microwave photon technologies include linearization, frequency conversion, frequency doubling, and millimeter wave generation. In actual signal transmission and processing, multiple functions are often needed to be used in combination, and a single function cannot meet the requirements of modern communication transmission. However, simply combining links may increase the complexity of the system, and in order to improve the advantages of the microwave photonic technology, the integrated use of multiple functions becomes one of the important research contents of researchers.
Disclosure of Invention
In view of this, the present invention is directed to provide a microwave optical subsystem with multiple functions of frequency conversion, phase shift, linearization processing, etc. to meet the processing and transmission requirements of communication signals, and implement fiber link linearization transmission by matching a reasonable input modulation signal with a band pass filter, connect a DPMZM in parallel with a MZM to implement frequency conversion transmission of signals, and implement phase shift of transmission signals by a polarization controller, a polarization rotator, a polarization beam combiner, a phase modulator, etc.
In order to achieve the purpose, the invention provides the following technical scheme:
a microwave photonic system with nonlinear distortion compensation and phase shift functions comprises a signal generation part, a linear frequency conversion part and a phase shift part.
The signal generating section includes a signal generator (12) for generating a radio frequency signal, a signal generator (14) for generating a local oscillation signal, and a direct current voltage source section (13), (15); the signal generator (12) generates a radio frequency signal and loads the radio frequency signal onto an optical carrier through the DPMZM (3), the signal generator (14) generates a local oscillator signal and loads the local oscillator signal onto the optical carrier through the MZM (4), the direct current voltage source (13) is connected to the DPMZM (3), and the direct current voltage source (15) is connected to the MZM (4).
Further, the DPMZM (3) is composed of 3 MZMs (16) (17) (18), a direct current voltage source (13) is connected to the MZMs (16) (17) (18), and the direct current bias angle of the MZMs (16) (17) (18) is set to be 0, -pi, 0; a direct current voltage source (15) is connected to the MZM (4) and sets a direct current bias angle to be pi/2; the signal generator (12) is connected to the upper and lower arms of MZM (16) and has the formula [1]The signal generator (12) is connected to the upper and lower arms of MZM (15) and has the formula [2 ]]Wherein the voltage V is modulatedmSet as half of half-wave voltage, the local oscillator signal generated by the signal generator (14) is of the formula [3]。
V11(t)＝Vm(cos w1t+sin w2t),V12(t)＝Vm(sin w1t+cos w2t) [1]
V21(t)＝Vm(sin w1t+sin w2t),V22(t)＝Vm(cos w1t+cos w2t) [2]
Figure BDA0003396050330000011
The linear frequency conversion part comprises a laser (1), a polarization controller (2), a DPMZM (3), a MZM (4), a 90-degree polarization rotator (5), a polarization beam combiner (6) and a band-pass filter (7); the laser (1) generates an optical carrier wave and is connected to a polarization controller (2), the polarization controller (2) is connected to a DPMZM (3) through a 1 x 2 optical splitter, one part of the optical carrier wave is connected to the MZM (4), and the other part of the optical carrier wave is connected to a 90-degree polarization rotator (5); the DPMZM (3) and the MZM (4) are connected to a band-pass filter (7) through a polarization beam combiner (6), the band-pass filter (7) is connected to a phase modulator (8) through an optical splitter, and multi-channel parallel phase shifting can be achieved.
The phase shifting part consists of a phase modulator (8), a 45-degree polarizer (9), an optical amplifier (10) and a photoelectric detector (11); the phase modulator (8) is connected to the 45 DEG polarizer (9), connected to the optical amplifier (10) and finally connected to the photodetector (11);
the phase-shifting circuit has the advantages that linearization is realized by loading the set bias angle and the modulation signal to the DPMZM (3), frequency conversion is realized by connecting the DPMZM (3) and the MZM (4) in parallel, different displacements of mutually orthogonal signals are realized by the phase modulator (8), and the phase shifting of the frequency conversion signal is realized.
The invention has the innovation points that the integrated link with the nonlinear distortion compensation frequency conversion phase shift function is realized by improving the link combination with only a single function, and the microwave optical subsystem with the nonlinear distortion compensation frequency conversion phase shift function is realized on the basis of the general simulation theory and on the basis of theoretical derivation and simulation, so that the linearity is obviously improved compared with the traditional orthogonal MZM link, and the integrated link with the nonlinear distortion compensation frequency conversion phase shift function has the frequency conversion phase shift function.
The application value of the invention lies in that the method finds out the potential of the microwave photon link, improves the processing capacity of the system to signals in the optical domain, improves the flexibility and compatibility of the system, and the system is expected to be used for receiving ends of communication systems such as microwave photon radars, phased arrays and the like.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of a modulator used in the system of the present invention;
Detailed Description
Laser (1) generationThe polarization direction of the optical carrier wave is fixed through the polarization controller (2), and the optical carrier wave is divided into two parts after passing through the polarization controller (2); a portion of the frequency generated by the DPMZM (3), MZM (16) and MZM (17) is w0+2w1-w2And w0+2w2-w1And the resulting signals are equal in amplitude and opposite in direction, and cancel each other out after passing through the MZM (18), w0+2w1-w2And w0+2w2-w1The carrier beat frequency can generate third-order nonlinear distortion, and the linearity of a link can be improved after the third-order nonlinear distortion is eliminated; the other part passes through the MZM (4) and a 90-degree polarization rotator (5), so that the polarized light of the two parts is different by 90 degrees, and the output of the upper part and the lower part has orthogonal partial normality; the two optical signals are connected to a band-pass filter (7) after passing through a polarization beam combiner (6) to filter out unwanted optical sidebands, such as w0+2w1-2w2And w0+2w2-2w1The frequency and the fundamental beat frequency can generate third-order nonlinear distortion, and only a radio frequency signal of a first order and a local oscillator signal of the first order are reserved; the generated optical signal passes through the phase modulator (8), the phase modulator (8) generates different phases for polarized lights in different polarization directions, and phase shift between 0 and 360 degrees can be realized by controlling voltage. The generated optical signals are subjected to polarization projection through a 45-degree polarizer (9), the signals in orthogonal partial normality are combined in the same direction, finally, the signals after frequency conversion and phase shift are generated after beat frequency of a photoelectric detector (11), and the linearity of a link system is improved.

Claims (3)

1. A microwave optical subsystem with nonlinear distortion compensation and frequency conversion and phase shift functions is characterized by comprising a signal generation part, a linearization frequency conversion part and a phase shift part; the signal generating section includes a signal generator (12) for generating a radio frequency signal, a signal generator (14) for generating a local oscillation signal, and a direct current voltage source section (13), (15); the signal generator (12) generates a radio frequency signal and loads the radio frequency signal to an optical carrier through the DPMZM (3), the signal generator (14) generates a local oscillator signal and loads the local oscillator signal to the MZM (4), the direct current voltage source (13) is connected to the DPMZM (3), and the direct current voltage source (15) is connected to the MZM (4);
the linear frequency conversion part comprises a laser (1), a polarization controller (2), a DPMZM (3), a MZM (4), a 90-degree polarization rotator (5), a polarization beam combiner (6) and a band-pass filter (7); the laser (1) generates an optical carrier wave and is connected to a polarization controller (2), the polarization controller (2) is connected to a DPMZM (3) through a 1 x 2 optical splitter, one part of the optical carrier wave is connected to the MZM (4), and the other part of the optical carrier wave is connected to a polarization rotator (5); the DPMZM (3) and the MZM (4) are connected to a band-pass filter (7) through a polarization beam combiner (6), and the band-pass filter (7) is connected to a phase modulator (8) through an optical splitter. The phase shifting part consists of a phase modulator (8), a 45-degree polaroid (9) and a photoelectric detector (11); the phase modulator (8) is connected to the polarizer (9), the 45 DEG polarizer (9) is connected to the optical amplifier (10) and to the photodetector (11).
2. The microwave optical subsystem with nonlinear distortion compensation and frequency conversion and phase shift functions as claimed in claim 1, wherein: the DPMZM (3) consists of 3 MZMs (16) (17) (18), a direct current voltage source (13) is further connected to the MZMs (16) (17) (18), and the direct current bias angle of the MZMs (16) (17) (18) is set to be 0, -pi, 0; a DC voltage source (15) is connected to the MZM (4) and the DC bias angle is set to π/2 so that it is in a single sideband modulation state.
3. The microwave optical subsystem with nonlinear distortion compensation and frequency conversion and phase shift functions as claimed in claim 1, wherein: the optical signals passing through the band-pass filter (7) can be divided into the same multi-channel signals through an optical splitter, and the parallel phase shift of the multi-channel signals is realized.
CN202111482866.7A 2021-12-07 2021-12-07 Microwave optical subsystem with nonlinear distortion compensation frequency conversion phase shift function Pending CN114039667A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011019029A (en) * 2009-07-08 2011-01-27 Mitsubishi Electric Corp Transmitter for array antenna
CN102354023A (en) * 2011-10-27 2012-02-15 电子科技大学 1*N waveguide type adjustable light power beam splitter
CN102694550A (en) * 2012-05-18 2012-09-26 宁波大学 Nonlinearity extractor of ultra-wideband radio-frequency power amplifier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011019029A (en) * 2009-07-08 2011-01-27 Mitsubishi Electric Corp Transmitter for array antenna
CN102354023A (en) * 2011-10-27 2012-02-15 电子科技大学 1*N waveguide type adjustable light power beam splitter
CN102694550A (en) * 2012-05-18 2012-09-26 宁波大学 Nonlinearity extractor of ultra-wideband radio-frequency power amplifier

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张弘骉: "《微波光子非线性失真补偿与变频移相方法研究》", 《中国优秀硕士学位论文全文库》 *

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