CN113162694A - Photon auxiliary vector millimeter wave signal generation system - Google Patents
Photon auxiliary vector millimeter wave signal generation system Download PDFInfo
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- CN113162694A CN113162694A CN202110202075.8A CN202110202075A CN113162694A CN 113162694 A CN113162694 A CN 113162694A CN 202110202075 A CN202110202075 A CN 202110202075A CN 113162694 A CN113162694 A CN 113162694A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
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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
- H04B10/70—Photonic quantum communication
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention belongs to the technical field of optical fiber-wireless communication, and particularly relates to a photon auxiliary vector millimeter wave signal generating system. In the system, the optical millimeter wave is divided into an upper path and a lower path by an optical polarization beam splitter and is modulated by an upper modulator and a lower modulator respectively; the two baseband signal sources respectively drive the upper modulator and the lower modulator, the phase difference value of the upper signal and the lower signal is 90 degrees through the phase shifter, and the optical attenuator is adjusted, so that the upper signal and the lower signal have the same insertion loss. The optical coupler couples the upper and lower signals into a single signal, and the photo-detector detects the single signal to generate a vector millimeter wave signal. The vector millimeter wave signal generated by the system has high and stable rate, does not need expensive DAC, can be integrated by the photonic integration technology, and simplifies the system structure.
Description
Technical Field
The invention belongs to the technical field of Radio-over-Fiber (ROF) communication, and particularly relates to a photon-assisted vector millimeter wave signal generation system.
Background
With the development of information technology and the generation of massive data, a large-capacity and high-rate demand is put on a communication system. The wireless access technology has the characteristics of flexibility, convenience and the like, and becomes the mainstream of the current access technology. Meanwhile, the optical fiber communication system has the advantages of large bandwidth, low loss transmission and the like, and the ROF communication system combining optical fiber transmission and wireless access becomes a research hotspot and is expected to become a next-generation high-capacity and high-rate communication technology.
In the ROF communication system, it is most important to be able to flexibly generate millimeter wave signals of different modulation formats and rate vectors. In the traditional method, an I/Q (In-phase/Quadrature) modulator modulates a baseband vector signal on an optical carrier, then beats with another local oscillator optical signal, and a vector millimeter wave signal is obtained after detection by a photoelectric detector. But the vector millimeter wave signal generated by the scheme is not pure. A modulator based on a single MZM (Mach-Zehnder modulator) can generate a stable vector millimeter signal, but this scheme requires a DAC, and cannot generate a high-speed vector millimeter wave signal due to the limited bandwidth of the DAC. Also, DACs are expensive and consume large amounts of power.
Therefore, the invention provides a novel photon auxiliary vector millimeter wave signal generation system. In the system, the optical millimeter wave is divided into an upper path and a lower path by an optical polarization beam splitter and modulated by an upper modulator and a lower modulator respectively. The two baseband signal sources respectively drive the upper modulator and the lower modulator, the phase difference value of the upper path of optical millimeter wave signal and the lower path of optical millimeter wave signal is 90 degrees through the phase shifter, and the optical attenuator is adjusted, so that the upper path of optical millimeter wave signal and the lower path of optical millimeter wave signal have the same insertion loss. The optical coupler couples the upper and lower signals into a polarization multiplexing optical signal, and the optical signal is detected by the photoelectric detector to generate a vector millimeter wave signal. The generated vector millimeter wave signal has high speed and stability, and can be integrated through a photon integration technology, thereby simplifying the system structure.
The system utilizes two cascaded intensity modulators to generate high-speed vector millimeter wave signals under the condition of no DAC, and can also be integrated by a photon integration technology, so that the system is simple in structure, and the system complexity is reduced.
Disclosure of Invention
The invention aims to provide a photon auxiliary vector millimeter wave signal generating system which is simple in structure and excellent in performance.
The photon auxiliary vector millimeter wave signal generating system provided by the invention has the structure as shown in figure 1; the method comprises the following steps: signal source, polarizing beam splitter, intensity modulator, phase shifter, optical attenuator, optical coupler, Photodetector (PD), wherein:
the signal source is used for generating a baseband signal;
the polarization beam splitter is used for splitting the optical millimeter wave signals into two paths;
the number of the intensity modulators is two, and the intensity modulators are used for modulating optical millimeter waves;
the phase shifter is used for generating a phase meter;
the optical attenuator is used for adjusting optical power;
the optical coupler is used for transmitting an upper optical signal and a lower optical signal;
the Photoelectric Detector (PD) is used for beating the optical signals to generate vector millimeter wave signals.
The optical polarization beam splitter divides the optical millimeter wave signal into an upper path and a lower path, and drives the upper modulator and the lower modulator respectively by utilizing two paths of baseband on-off keying (OOK) signals generated by a signal source or commercial software; the two intensity modulators respectively modulate the intensity of the upper and lower light millimeter wave signals; the phase difference of the upper and lower optical millimeter wave signals is 90 degrees through a phase shifter; the optical power is adjusted through the optical attenuator, and the outputs of the two paths have the same insertion loss; the optical coupler synthesizes the upper and lower optical signals into a polarization multiplexing optical signal, and the photoelectric detector performs beat frequency on the optical signal output by the optical coupler to generate a vector millimeter wave signal.
The invention utilizes the baseband OOK signal to drive the intensity modulator, can generate high-speed vector millimeter wave signals without a DAC, and can carry out photonic integration through a photonic integration technology. The system has simple structure and easy realization, and the invention can play a great advantage in future ROF system access networks.
Drawings
FIG. 1 is a schematic structural view of a photon assisted vector millimeter wave signal generating system of the present invention d.
Reference numbers in the figures: 1 is an optical millimeter wave, 2 is a polarization beam splitter, 3 is a first baseband signal 1, 33 is a second baseband signal 2, 4 is a first modulator, 44 is a second modulator 2, 5 is a phase shifter, 6 is an optical attenuator, 7 is an optical coupler, and 8 is a Photodetector (PD).
Detailed Description
The present invention will be described in detail below with reference to specific experimental examples and the accompanying drawings.
As shown in fig. 1, each component and function of a novel photon-assisted vector millimeter wave signal generation system are respectively described as follows:
optical millimeter wave 1, wavelength λ1The optical millimeter wave of (1). And the polarization beam splitter 2 divides the optical millimeter wave 1 into an upper path and a lower path. A baseband signal source 3 and a baseband signal source 33 for generating a baseband OOK signal a1(t) and a2(t) of (d). Intensity modulator 4 and intensity modulator 44, to be supplied with baseband signal a1(t) removing a2And (t) driving and modulating the two optical signals generated by the polarization beam splitter 2. The phase shifter 5 generates a 90-degree phase shift, and the phase difference of the upper and lower optical millimeter wave signals is 90 degrees through the phase shifter 5. The optical attenuator 6 is used to adjust the optical power, and the outputs of the upper and lower paths have the same insertion loss by using the optical attenuator 6. The optical coupler 7 synthesizes the upper and lower optical signals into a polarization multiplexed optical millimeter wave signal, and the photodetector 8 performs beat frequency on the optical signal output by the optical coupler 7 to generate a vector millimeter wave signal.
The specific connection mode of the vector millimeter wave signal generation system is as follows, as shown in fig. 1.
The output end of the optical millimeter wave 1 is connected with the input end of the polarization beam splitter 2 by an optical fiber. The polarization beam splitter 2 is connected to the modulator 4 and the modulator 44 by optical fibers. The outputs of the baseband signal source 3 and the baseband signal source 33 are connected to the electrical inputs of the modulators 4 and 44, respectively, by cables. The output of the modulator 4 is connected to the input of the phase shifter 5 by an optical fiber, and the output of the modulator 44 is connected to the input of the optical attenuator 6 by an optical fiber. The output ends of the phase shifter 5 and the optical attenuator 6 are respectively connected with the input end of the optical coupler 7 by optical fibers. The output end of the coupler 7 is connected with the input end of the photoelectric detector 8 by an optical fiber. The polarization beam splitter 2, the modulator 4, the phase shifter 5, the optical attenuator 6 and the coupler 7 can be integrated on a chip by adopting a photonic integration mode, so that the devices are connected by adopting an optical waveguide mode.
The invention utilizes two intensity modulators, does not need to use DAC, generates high-speed vector millimeter wave signals, and has simple system structure and easy realization.
Claims (1)
1. A photon assisted vector millimeter wave signal generation system, comprising: signal source, polarization beam splitter, intensity modulator, phase shifter, optical attenuator, optical coupler, photoelectric detector, wherein:
the signal source is used for generating a baseband signal;
the polarization beam splitter is used for splitting the optical millimeter wave signals into two paths;
the number of the intensity modulators is two, and the intensity modulators are used for modulating optical millimeter waves;
the phase shifter is used for generating a phase meter;
the optical attenuator is used for adjusting optical power;
the optical coupler is used for coupling an upper optical signal and a lower optical signal;
the photoelectric detector is used for beating the optical signals to generate vector millimeter wave signals;
the optical polarization beam splitter divides the optical millimeter wave signal into an upper path and a lower path, and the upper modulator and the lower modulator are respectively driven by two paths of baseband on-off keying signals generated by a signal source or commercial software; the two intensity modulators respectively modulate the intensity of the upper and lower light millimeter wave signals; the phase difference of the upper and lower optical millimeter wave signals is 90 degrees through a phase shifter; the optical power is adjusted through the optical attenuator, and the outputs of the two paths have the same insertion loss; the optical coupler synthesizes the upper and lower optical signals into a polarization multiplexing optical signal, and the photoelectric detector performs beat frequency on the optical signal output by the optical coupler to generate a vector millimeter wave signal.
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