Device for generating thirty-two frequency multiplication millimeter waves based on double parallel modulators

Abstract

The utility model relates to the technical field of millimeter wave generation, and discloses a device for generating thirty-two frequency multiplication millimeter waves based on double parallel modulators. The device comprises a tunable laser, a first optical power divider, a second optical power divider, a first double-parallel Mach-Zehnder modulator, a second double-parallel Mach-Zehnder modulator, a tunable optical attenuator, a tunable optical phase shifter, a first optical combiner, a second optical combiner, an erbium-doped fiber amplifier, a photoelectric detector and a radio frequency local oscillator source. The power divider comprises a first electric power divider, a second electric power divider, a third electric power divider, a fourth electric power divider, a fifth electric power divider, a sixth electric power divider, a seventh electric power divider, a first electric phase shifter, a second electric phase shifter, a third electric phase shifter, a fourth electric phase shifter, a fifth electric phase shifter, a sixth electric phase shifter and a seventh electric phase shifter. The thirty-two-frequency-multiplication millimeter wave signal generator can generate thirty-two-frequency-multiplication millimeter wave signals with high purity, low noise and high quality.

Description

Technical Field

[0001] The utility model relates to the technical field of millimeter wave generation, in particular to a device for generating thirty-two-fold frequency millimeter waves based on double parallel modulators. Background Art

[0002] At present, there are three main technologies for generating millimeter wave signals using optical methods, namely optical heterodyne, frequency up-conversion, and nonlinear modulation of external modulators. Among them:

[0003] 1. Optical heterodyning refers to the use of light waves of different frequencies from two lasers with narrow linewidths to beat in a photodetector, thereby generating a radio frequency signal with a frequency equal to the difference between the two light waves. However, the optical heterodyning method has strict restrictions on the linewidth of the light source, and often requires two or more such lasers, resulting in high system costs. At the same time, since phase-locked technology or lasers with special structures are required to improve the coherence of the two light waves involved in the beat, the system is more complex and costly.

[0004] 2. Frequency up-conversion is to first optically modulate the low-frequency intermediate frequency microwave signal to generate an optical intermediate frequency signal, and then use optical methods to convert the optical intermediate frequency signal into a higher-frequency optical radio frequency signal. After passing through a photodetector, an radio frequency signal with a higher frequency than the intermediate frequency microwave signal can be generated. For the frequency up-conversion method, frequency conversion is plagued by many problems such as incident power limitation, polarization control, and crosstalk, and is relatively complicated.

[0005] 3. The system structure corresponding to the nonlinear modulation method of the external modulator is simpler and less expensive than the first two, and can generate high-purity, low-phase-noise millimeter-wave signals. However, when it is necessary to generate millimeter-wave signals with a high frequency multiplication factor of more than 16 times, the signal quality generated is not good enough. Utility Model Content

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a device for generating 32-fold frequency millimeter waves based on a dual parallel modulator, which can generate high-purity, low-noise, high-quality 32-fold frequency millimeter wave signals.

[0007] According to an embodiment of the utility model, a device for generating thirty-two times frequency millimeter waves based on a dual parallel modulator includes:

[0008] Tunable lasers;

[0009] A first optical power divider, an input end of which is electrically connected to an output end of the tunable laser;

[0010] a second optical power splitter, an input end of which is electrically connected to the first output end of the first optical power splitter;

[0011] a first dual parallel Mach-Zehnder modulator, an input end of which is electrically connected to a first output end of the second optical power divider;

[0012] a second dual parallel Mach-Zehnder modulator, whose input end is electrically connected to the second output end of the second optical power divider;

[0013] a tunable optical attenuator, an input end of which is electrically connected to the second output end of the first optical power divider;

[0014] A tunable optical phase shifter, the input end of which is electrically connected to the output end of the tunable optical attenuator;

[0015] a first optical combiner, wherein a first input end of the first optical combiner is electrically connected to an output end of the first dual-parallel Mach-Zehnder modulator, and a second input end of the first optical combiner is electrically connected to an output end of the second dual-parallel Mach-Zehnder modulator;

[0016] a second optical combiner, wherein a first input end of the second optical combiner is electrically connected to an output end of the first optical combiner, and a second input end of the second optical combiner is electrically connected to an output end of the tunable optical phase shifter;

[0017] an erbium-doped fiber amplifier, the input end of which is electrically connected to the output end of the second optical power divider;

[0018] A photoelectric detector, the input end of which is electrically connected to the output end of the erbium-doped fiber amplifier;

[0019] RF local oscillator source;

[0020] A first electric power divider, an input end of which is electrically connected to an output end of the radio frequency local oscillator;

[0021] a second electric power divider, an input end of which is electrically connected to a first output end of the first electric power divider;

[0022] a third electric power divider, wherein an input end is electrically connected to a first output end of the second electric power divider through a first electric phase shifter, a first output end of the third electric power divider is electrically connected to an electrode of a first sub-modulator of the first dual parallel Mach-Zehnder modulator through a second electric phase shifter, and a second output end of the third electric power divider is electrically connected to another electrode of the first sub-modulator of the first dual parallel Mach-Zehnder modulator;

[0023] a fourth electric power divider, wherein the input end is electrically connected to the second output end of the electric power divider, the first output end of the fourth electric power divider is electrically connected to an electrode of the second sub-modulator of the first dual parallel Mach-Zehnder modulator through a third electric phase shifter, and the second output end of the fourth electric power divider is electrically connected to another electrode of the second sub-modulator of the first dual parallel Mach-Zehnder modulator;

[0024] a fifth electric power divider, an input end of which is electrically connected to the second output end of the first electric power divider through a fourth electric phase shifter;

[0025] a sixth electric power divider, wherein the input end is electrically connected to the first output end of the fifth electric power divider through the fifth electric phase shifter, the first output end of the sixth electric power divider is electrically connected to an electrode of the first sub-modulator of the second dual parallel Mach-Zehnder modulator through the sixth electric phase shifter, and the second output end of the sixth electric power divider is electrically connected to another electrode of the first sub-modulator of the second dual parallel Mach-Zehnder modulator;

[0026] A seventh electric power divider, wherein the input end is electrically connected to the second output end of the fifth electric power divider, the first output end of the seventh electric power divider is electrically connected to an electrode of the second sub-modulator of the second dual parallel Mach-Zehnder modulator, and the second output end of the seventh electric power divider is electrically connected to another electrode of the second sub-modulator of the second dual parallel Mach-Zehnder modulator through a seventh electrical phase shifter.

[0027] According to some embodiments of the embodiments of the present invention, the first sub-modulator and the second sub-modulator of the first dual parallel Mach-Zehnder modulator and the first sub-modulator and the second sub-modulator of the second dual parallel Mach-Zehnder modulator are biased at a maximum output point.

[0028] According to some embodiments of the embodiments of the present invention, the first electrical phase shifter is used to introduce an electrical phase difference of π between the first sub-modulator and the second sub-modulator of the first dual parallel Mach-Zehnder modulator, and the fifth electrical phase shifter is used to introduce an electrical phase difference of π between the first sub-modulator and the second sub-modulator of the second dual parallel Mach-Zehnder modulator.

[0029] According to some embodiments of the embodiments of the present invention, the second electrical phase shifter is used to introduce an electrical phase difference of π / 2 between two electrodes of the first sub-modulator of the first dual parallel Mach-Zehnder modulator, the third electrical phase shifter is used to introduce an electrical phase difference of π / 2 between two electrodes of the second sub-modulator of the first dual parallel Mach-Zehnder modulator, the sixth electrical phase shifter is used to introduce an electrical phase difference of π / 2 between two electrodes of the first sub-modulator of the second dual parallel Mach-Zehnder modulator, and the seventh electrical phase shifter is used to introduce an electrical phase difference of π / 2 between two electrodes of the second sub-modulator of the second dual parallel Mach-Zehnder modulator.

[0030] According to some embodiments of the embodiments of the present invention, the fourth electrical phase shifter is used to introduce an electrical phase difference of π / 4 for the first dual parallel Mach-Zehnder modulator and the second dual parallel Mach-Zehnder modulator.

[0031] According to some embodiments of the embodiments of the present invention, the modulation coefficients of the first dual parallel Mach-Zehnder modulator and the second dual parallel Mach-Zehnder modulator are 16.038 or 19.555.

[0032] According to some embodiments of the embodiments of the present invention, the insertion loss of each sub-modulator of the first dual parallel Mach-Zehnder modulator and the second dual parallel Mach-Zehnder modulator is set to the same preset value.

[0033] According to some embodiments of the embodiments of the present utility model, the first optical power splitter is used to evenly split the light emitted by the tunable laser and output it into two paths.

[0034] According to some embodiments of the embodiments of the present utility model, the second optical power splitter is used to evenly split the signal of the first output end of the first optical power splitter and output it into two paths.

[0035] The utility model is a device for generating thirty-two times frequency millimeter wave based on dual parallel modulators, which has at least the following beneficial effects: by setting bias voltage in the sub-modulators of the first dual parallel Mach-Zehnder modulator and the second dual parallel Mach-Zehnder modulator, introducing an electrical phase difference into the radio frequency signal between the two electrodes of each sub-modulator, introducing an electrical phase difference between the first sub-modulator and the second sub-modulator of the first dual parallel Mach-Zehnder modulator, introducing an electrical phase difference between the first sub-modulator and the second sub-modulator of the second dual parallel Mach-Zehnder modulator, and adjusting the attenuation coefficient of the tunable optical attenuator and the phase shift value of the tunable optical phase shifter, high-quality thirty-two times frequency millimeter wave signal can be generated.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 It is a schematic structural diagram of a device for generating thirty-two-fold frequency millimeter waves based on a dual parallel modulator according to an embodiment of the utility model;

[0039] Figure 2 This is the spectrum diagram with modulation coefficient 16.038, extinction ratio 30dB, optical attenuation 19.98dB, and no optical phase shift;

[0040] Figure 3 The electrical spectrum is a modulation factor of 16.038, an extinction ratio of 30dB, an optical attenuation of 19.98dB, and no optical phase shift;

[0041] Figure 4 This is the spectrum diagram of modulation coefficient 16.038, extinction ratio 70dB, optical attenuation 19.98dB, and no optical phase shift;

[0042] Figure 5 The electrical spectrum is a modulation factor of 16.038, an extinction ratio of 70dB, an optical attenuation of 19.98dB, and no optical phase shift;

[0043] Figure 6 The spectrum is a modulation factor of 19.555, an extinction ratio of 30dB, an optical attenuation of 19.91dB, and an optical phase shift of 180 degrees;

[0044] Figure 7 The electrical spectrum is a modulation factor of 19.555, an extinction ratio of 30dB, an optical attenuation of 19.91dB, and an optical phase shift of 180 degrees;

[0045] Figure 8 This is the spectrum diagram with modulation coefficient 19.555, extinction ratio 70dB, optical attenuation 19.91dB, and phase shift 180 degrees;

[0046] Fig. 9 The electrical spectrum is a modulation coefficient of 19.555, an extinction ratio of 70dB, an optical attenuation of 19.91dB, and an optical phase shift of 180 degrees. DETAILED DESCRIPTION

[0047] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0048] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of the first, second, third, fourth, fifth, sixth, and seventh, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0050] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably confirm the specific meaning of the above terms in the present utility model in combination with the specific content of the technical solution.

[0051] refer to Figure 1According to an embodiment of the utility model, a device for generating a thirty-two-fold frequency millimeter wave based on a dual parallel modulator includes an adjustable laser CW Laser, a first optical power splitter OS1, a second optical power splitter OS2, a first dual parallel Mach-Zehnder modulator DP-MZM-1, a second dual parallel Mach-Zehnder modulator DP-MZM-2, a tunable optical attenuator VOA, a tunable optical phase shifter VOPS, a first optical combiner OC1, a second optical combiner OC2, an erbium-doped fiber amplifier EDFA, a photodetector PD, and a radio frequency local oscillator RF LO, the first electric power divider ES-1, the second electric power divider ES-2, the third electric power divider ES-3, the fourth electric power divider ES-4, the fifth electric power divider ES-5, the sixth electric power divider ES-6, the seventh electric power divider ES-7, the first electric phase shifter EPS-2, the second electric phase shifter EPS-3, the third electric phase shifter EPS-4, the fourth electric phase shifter EPS-1, the fifth electric phase shifter EPS-5, the sixth electric phase shifter EPS-6, the seventh electric phase shifter EPS-7. The input end of the first optical power divider OS1 is connected to the adjustable laser CW The output end of Laser is electrically connected; the input end of the second optical power divider OS2 is electrically connected to the first output end of the first optical power divider OS1; the input end of the first dual parallel Mach-Zehnder modulator DP-MZM-1 is electrically connected to the first output end of the second optical power divider OS2; the input end of the second dual parallel Mach-Zehnder modulator DP-MZM-2 is electrically connected to the second output end of the second optical power divider OS2; the input end of the tunable optical attenuator VOA is electrically connected to the second output end of the first optical power divider OS1; the input end of the tunable optical phase shifter VOPS is electrically connected to the output end of the tunable optical attenuator VOA; the first input end of the first optical combiner OC1 is electrically connected to the first dual parallel The output end of the parallel Mach-Zehnder modulator DP-MZM-1 is electrically connected, the second input end of the first optical combiner OC1 is electrically connected to the output end of the second dual parallel Mach-Zehnder modulator DP-MZM-2; the first input end of the second optical combiner OC2 is electrically connected to the output end of the first optical combiner OC1, and the second input end of the second optical combiner OC2 is electrically connected to the output end of the tunable optical phase shifter VOPS; the input end of the erbium-doped fiber amplifier EDFA is electrically connected to the output end of the second optical power divider OS2; the input end of the photodetector PD is electrically connected to the output end of the erbium-doped fiber amplifier EDFA; the input end of the first electric power divider ES-1 is electrically connected to the output end of the radio frequency local oscillator RF LO; the input end of the second electric power divider ES-2 is electrically connected to the first output end of the first electric power divider ES-1;The input end of the third electric power divider ES-3 is electrically connected to the first output end of the second electric power divider ES-2 through the first electric phase shifter EPS-2, the first output end of the third electric power divider ES-3 is electrically connected to an electrode of the first sub-modulator (the upper sub-modulator) of the first dual parallel Mach-Zehnder modulator DP-MZM-1 through the second electric phase shifter EPS-3, and the second output end of the third electric power divider ES-3 is electrically connected to another electrode of the first sub-modulator of the first dual parallel Mach-Zehnder modulator DP-MZM-1; the fourth electric power divider ES-3 is electrically connected to the first sub-modulator of the first dual parallel Mach-Zehnder modulator DP-MZM-1; The input end of the electric power divider ES-4 is electrically connected to the second output end of the electric power divider, the first output end of the fourth electric power divider ES-4 is electrically connected to an electrode of the second sub-modulator (the lower sub-modulator) of the first dual parallel Mach-Zehnder modulator DP-MZM-1 through the third electric phase shifter EPS-4, and the second output end of the fourth electric power divider ES-4 is electrically connected to another electrode of the second sub-modulator of the first dual parallel Mach-Zehnder modulator DP-MZM-1; the input end of the fifth electric power divider ES-5 is electrically connected to the fourth electric phase shifter EPS-1 The input end of the sixth electric power divider ES-6 is electrically connected to the first output end of the fifth electric power divider ES-5 through the fifth electric phase shifter EPS-5, the first output end of the sixth electric power divider ES-6 is electrically connected to an electrode of the first sub-modulator (the upper sub-modulator) of the second dual parallel Mach-Zehnder modulator DP-MZM-2 through the sixth electric phase shifter EPS-6, and the second output end of the sixth electric power divider ES-6 is electrically connected to the second dual parallel Mach-Zehnder modulator DP-MZM-2 The input end of the seventh electric power divider ES-7 is electrically connected to the second output end of the fifth electric power divider ES-5, the first output end of the seventh electric power divider ES-7 is electrically connected to an electrode of the second sub-modulator (lower sub-modulator) of the second dual parallel Mach-Zehnder modulator DP-MZM-2, and the second output end of the seventh electric power divider ES-7 is electrically connected to the other electrode of the second sub-modulator of the second dual parallel Mach-Zehnder modulator DP-MZM-2 through the seventh electric phase shifter EPS-7. ;

[0052] According to some embodiments of the present invention, the first sub-modulator and the second sub-modulator of the first dual parallel Mach-Zehnder modulator DP-MZM-1 and the first sub-modulator and the second sub-modulator of the second dual parallel Mach-Zehnder modulator DP-MZM-2 are biased at the maximum output point.

[0053] According to some embodiments of the embodiments of the present invention, the first electrical phase shifter EPS-2 is used to introduce an electrical phase difference of π between the first sub-modulator and the second sub-modulator of the first dual parallel Mach-Zehnder modulator DP-MZM-1, and the fifth electrical phase shifter EPS-5 is used to introduce an electrical phase difference of π between the first sub-modulator and the second sub-modulator of the second dual parallel Mach-Zehnder modulator DP-MZM-2.

[0054] According to some embodiments of the embodiments of the present invention, the second electrical phase shifter EPS-3 is used to introduce an electrical phase difference of π / 2 between two electrodes of the first sub-modulator of the first dual parallel Mach-Zehnder modulator DP-MZM-1, the third electrical phase shifter EPS-4 is used to introduce an electrical phase difference of π / 2 between two electrodes of the second sub-modulator of the first dual parallel Mach-Zehnder modulator DP-MZM-1, the sixth electrical phase shifter EPS-6 is used to introduce an electrical phase difference of π / 2 between two electrodes of the first sub-modulator of the second dual parallel Mach-Zehnder modulator DP-MZM-2, and the seventh electrical phase shifter EPS-7 is used to introduce an electrical phase difference of π / 2 between two electrodes of the second sub-modulator of the second dual parallel Mach-Zehnder modulator DP-MZM-2.

[0055] According to some embodiments of the present invention, the fourth electrical phase shifter EPS-1 is used to introduce an electrical phase difference of π / 4 to the first dual parallel Mach-Zehnder modulator DP-MZM-1 and the second dual parallel Mach-Zehnder modulator DP-MZM-2.

[0056] According to some embodiments of the embodiments of the present invention, the modulation coefficients of the first dual parallel Mach-Zehnder modulator DP-MZM-1 and the second dual parallel Mach-Zehnder modulator DP-MZM-2 are 16.038 or 19.555.

[0057] According to some embodiments of the embodiments of the present invention, the insertion loss of each sub-modulator of the first dual parallel Mach-Zehnder modulator DP-MZM-1 and the second dual parallel Mach-Zehnder modulator DP-MZM-2 is set to the same preset value.

[0058] According to some embodiments of the utility model, the first optical power splitter OS1 is used to evenly split the light emitted by the tunable laser CWLaser and output it into two paths, one of which is output to the second optical power splitter OS2, and the other is output to the branches of the tunable optical attenuator VOA and the tunable optical phase shifter VOPS.

[0059] According to some embodiments of the embodiments of the utility model, the second optical power splitter OS2 is used to equally split the signal of the first output end of the first optical power splitter OS1 and output it into two paths, wherein one path is output to the input end of the first dual parallel Mach-Zehnder modulator DP-MZM-1, and the other path is output to the input end of the second dual parallel Mach-Zehnder modulator DP-MZM-2.

[0060] The specific working principle and process are as follows: Assume that the light wave frequency of the tunable laser CW Laser output is w0, the intensity is E0, and the frequency of the RF signal output by the RF local oscillator RF LO is w RF The initial phase is The RF switch voltage of the first dual parallel Mach-Zehnder modulator DP-MZM-1 and the second dual parallel Mach-Zehnder modulator DP-MZM-2 is V π , the RF signal voltage loaded on the sub-modulators of the first dual parallel Mach-Zehnder modulator DP-MZM-1 and the second dual parallel Mach-Zehnder modulator DP-MZM-2 is V RF The insertion loss of each submodulator (the first submodulator and the second submodulator) of the first dual parallel Mach-Zehnder modulator DP-MZM-1 and the second dual parallel Mach-Zehnder modulator DP-MZM-2 is IL MZM , the RF phase difference between the first dual parallel Mach-Zehnder modulator DP-MZM-1 and the second dual parallel Mach-Zehnder modulator DP-MZM-2 is The attenuation coefficient of the tunable optical attenuator VOA is α, and the phase shift value of the tunable optical phase shifter VOPS is Δφ.

[0061] 1. Set the bias voltage and RF signal difference of DP-MZM-1 and DP-MZM-2:

[0062] The sub-modulators of DP-MZM-1 and DP-MZM-2 are biased at the maximum output point, and the electrical phase difference between the two electrodes of each sub-modulator is π, and the electrical phase difference between the two sub-modulators of the same dual parallel Mach-Zehnder modulator is π / 2. Then the light field output by DP-MZM-1 is in the form of:

[0063]

[0064] The light field output by DP-MZM-2 is in the form of:

[0065]

[0066] The final output light field after passing through the second optical combiner OC2 is:

[0067] E out =Eout1 +E out2 +E out3 (4)

[0068] 2. Introduce a phase difference of π / 4 between the RF signals of DP-MZM-1 and DP-MZM-2, that is:

[0069]

[0070] Combining equations (1)-(5), when the following conditions are met:

[0071]

[0072] The result obtained at this time is that the 4th-order, 12th-order and 20th-order sidebands in the final output light field will be suppressed.

[0073] 3. Set the modulation coefficient of DP-MZM-1 and DP-MZM-2:

[0074] Combining equations (1)-(5), when the following conditions are met:

[0075] J8(m)=0 (9)

[0076] J -8 (m)=0 (10)

[0077] The result obtained at this time is that the 8th-order sideband in the final output light field will be suppressed; the modulation coefficient can be calculated as:

[0078] m=16.038 or 19.555 (11)

[0079] Combining equations (1)-(5) and (11), the final output light field can be rewritten as:

[0080]

[0081] 4. Adjust the attenuation coefficient of the tunable optical attenuator VOA and the phase shift value of the tunable optical phase shifter VOPS

[0082] From formula (12), we can get that when the following conditions are met:

[0083]

[0084] Available,

[0085]

[0086] When the modulation coefficient m is fixed, the attenuation coefficient α of the tunable optical attenuator VOA and the phase shift value of the tunable optical phase shifter VOPS can be adjusted. The carrier is also suppressed.

[0087] Combining equations (1)-(5), (11), and (14), the final output light field can be rewritten as:

[0088]

[0089] It can be seen from equation (15) that the final output light field has only 16th-order sidebands, and the beat frequency in the photodetector PD can obtain a millimeter wave with a frequency equal to 32 times the frequency of the radio frequency signal of the local oscillator signal RF LO.

[0090] The following is a specific example to verify the device for generating thirty-two-fold frequency millimeter waves based on a dual parallel modulator of the utility model:

[0091] exist Figure 1 In the system structure, the frequency of the light wave emitted by the adjustable laser source CW Laser is 193.1THz, the line width is 10MHz, and the optical power is 2dBm. The microwave frequency of the RF local oscillator source RF LO is 8GHZ. The sub-modulators of DP-MZM-1 and DP-MZM-2 are biased at the maximum output point, that is, V DC1 =V DC2 =V DC3 =V DC4 =V DC5 =V DC6 =V DC7 =V DC8 =V DC9 =V DC10 =0; the phase difference introduced by the second electrical phase shifter EPS-3, the third electrical phase shifter EPS-4, the sixth electrical phase shifter EPS-6 and the seventh electrical phase shifter EPS-7 is π / 2, the phase difference introduced by the first electrical phase shifter EPS-2 and the fifth electrical phase shifter EPS-5 is π, the phase difference introduced by the fourth electrical phase shifter EPS-1 is π / 4, the insertion loss of each sub-modulator of DP-MZM-1 and DP-MZM-2 is 5dB, and the modulation coefficient of DP-MZM-1 and DP-MZM-2 is set to 16.038 or 19.555. The gain of the erbium-doped fiber amplifier EDFA is 20dB, the noise figure is 4dB, the responsivity of the photodetector PD is 1A / W, and the dark current is 10nA.

[0092] Using Optisystem software, we can simulate and verify DP-MZM-1 and DP-MZM-2 with different extinction ratios based on the above parameters. Figure 2-9 The spectrum and electric spectrum obtained by simulation. Figure 2 and Figure 3They are the optical spectrum and electrical spectrum when the modulation coefficient is 16.038, the extinction ratio is 30dB, the optical attenuation of the tunable optical attenuator VOA is 19.98dB, and the tunable optical phase shifter VOPS has no optical phase shift. The optical sideband suppression ratio is 28.1dB, and the RF spurious suppression ratio is 21.3dB. Figure 4 and Figure 5 They are the optical spectrum and electrical spectrum when the modulation coefficient is 16.038, the extinction ratio is 70dB, the optical attenuation of the tunable optical attenuator VOA is 19.98dB, and the tunable optical phase shifter VOPS has no optical phase shift. The optical sideband suppression ratio is 49.1dB, and the RF spurious suppression ratio is 40.8dB. Figure 6 and Figure 7 They are the optical spectrum and electrical spectrum when the modulation coefficient is 19.555, the extinction ratio is 30dB, the optical attenuation of the tunable optical attenuator VOA is 19.91dB, and the optical phase shift of the tunable optical phase shifter VOPS is 180 degrees. The optical sideband suppression ratio is 22.5dB, and the RF spurious suppression ratio is 16.4dB. Figure 8 and Fig. 9 They are the optical spectrum and electrical spectrum when the modulation coefficient is 19.555, the extinction ratio is 70dB, the optical attenuation of the tunable optical attenuator VOA is 19.91dB, and the optical phase shift of the tunable optical phase shifter VOPS is 180 degrees. The optical sideband suppression ratio is 22.5dB, and the RF spurious suppression ratio is 15.2dB.

[0093] The utility model is a device for generating thirty-two times frequency millimeter wave based on dual parallel modulators, which has at least the following beneficial effects: by setting bias voltage in the sub-modulators of the first dual parallel Mach-Zehnder modulator and the second dual parallel Mach-Zehnder modulator, introducing an electrical phase difference into the radio frequency signal between the two electrodes of each sub-modulator, introducing an electrical phase difference between the first sub-modulator and the second sub-modulator of the first dual parallel Mach-Zehnder modulator, introducing an electrical phase difference between the first sub-modulator and the second sub-modulator of the second dual parallel Mach-Zehnder modulator, and adjusting the attenuation coefficient of the tunable optical attenuator and the phase shift value of the tunable optical phase shifter, high-quality thirty-two times frequency millimeter wave signal can be generated.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0095] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A device for generating thirty-two times frequency millimeter waves based on dual parallel modulators, characterized in that: include: Tunable lasers; A first optical power divider, an input end of which is electrically connected to an output end of the tunable laser; a second optical power splitter, an input end of which is electrically connected to the first output end of the first optical power splitter; a first dual parallel Mach-Zehnder modulator, an input end of which is electrically connected to a first output end of the second optical power divider; a second dual parallel Mach-Zehnder modulator, whose input end is electrically connected to the second output end of the second optical power divider; a tunable optical attenuator, an input end of which is electrically connected to the second output end of the first optical power divider; A tunable optical phase shifter, the input end of which is electrically connected to the output end of the tunable optical attenuator; a first optical combiner, wherein a first input end of the first optical combiner is electrically connected to an output end of the first dual-parallel Mach-Zehnder modulator, and a second input end of the first optical combiner is electrically connected to an output end of the second dual-parallel Mach-Zehnder modulator; a second optical combiner, wherein a first input end of the second optical combiner is electrically connected to an output end of the first optical combiner, and a second input end of the second optical combiner is electrically connected to an output end of the tunable optical phase shifter; an erbium-doped fiber amplifier, the input end of which is electrically connected to the output end of the second optical power divider; A photoelectric detector, the input end of which is electrically connected to the output end of the erbium-doped fiber amplifier; RF local oscillator source; A first electric power divider, an input end of which is electrically connected to an output end of the radio frequency local oscillator; a second electric power divider, an input end of which is electrically connected to a first output end of the first electric power divider; a third electric power divider, wherein an input end is electrically connected to a first output end of the second electric power divider through a first electric phase shifter, a first output end of the third electric power divider is electrically connected to an electrode of a first sub-modulator of the first dual parallel Mach-Zehnder modulator through a second electric phase shifter, and a second output end of the third electric power divider is electrically connected to another electrode of the first sub-modulator of the first dual parallel Mach-Zehnder modulator; a fourth electric power divider, wherein the input end is electrically connected to the second output end of the electric power divider, the first output end of the fourth electric power divider is electrically connected to an electrode of the second sub-modulator of the first dual parallel Mach-Zehnder modulator through a third electric phase shifter, and the second output end of the fourth electric power divider is electrically connected to another electrode of the second sub-modulator of the first dual parallel Mach-Zehnder modulator; a fifth electric power divider, an input end of which is electrically connected to the second output end of the first electric power divider through a fourth electric phase shifter; a sixth electric power divider, wherein the input end is electrically connected to the first output end of the fifth electric power divider through the fifth electric phase shifter, the first output end of the sixth electric power divider is electrically connected to an electrode of the first sub-modulator of the second dual parallel Mach-Zehnder modulator through the sixth electric phase shifter, and the second output end of the sixth electric power divider is electrically connected to another electrode of the first sub-modulator of the second dual parallel Mach-Zehnder modulator; A seventh electric power divider, wherein the input end is electrically connected to the second output end of the fifth electric power divider, the first output end of the seventh electric power divider is electrically connected to an electrode of the second sub-modulator of the second dual parallel Mach-Zehnder modulator, and the second output end of the seventh electric power divider is electrically connected to another electrode of the second sub-modulator of the second dual parallel Mach-Zehnder modulator through a seventh electrical phase shifter.

2. The device for generating thirty-two times frequency millimeter wave based on dual parallel modulators according to claim 1, characterized in that: The first sub-modulator and the second sub-modulator of the first dual-parallel Mach-Zehnder modulator and the first sub-modulator and the second sub-modulator of the second dual-parallel Mach-Zehnder modulator are biased at a maximum output point.

3. The device for generating thirty-two times frequency millimeter wave based on dual parallel modulators according to claim 1, characterized in that: The first electrical phase shifter is used to introduce an electrical phase difference of π between the first sub-modulator and the second sub-modulator of the first dual parallel Mach-Zehnder modulator, and the fifth electrical phase shifter is used to introduce an electrical phase difference of π between the first sub-modulator and the second sub-modulator of the second dual parallel Mach-Zehnder modulator.

4. The device for generating thirty-two times frequency millimeter wave based on dual parallel modulators according to claim 1, characterized in that: The second electrical phase shifter is used to introduce an electrical phase difference of π / 2 between the two electrodes of the first sub-modulator of the first dual parallel Mach-Zehnder modulator, the third electrical phase shifter is used to introduce an electrical phase difference of π / 2 between the two electrodes of the second sub-modulator of the first dual parallel Mach-Zehnder modulator, the sixth electrical phase shifter is used to introduce an electrical phase difference of π / 2 between the two electrodes of the first sub-modulator of the second dual parallel Mach-Zehnder modulator, and the seventh electrical phase shifter is used to introduce an electrical phase difference of π / 2 between the two electrodes of the second sub-modulator of the second dual parallel Mach-Zehnder modulator.

5. The device for generating thirty-two times frequency millimeter wave based on dual parallel modulators according to claim 1, characterized in that: The fourth electrical phase shifter is used to introduce an electrical phase difference of π / 4 into the first dual parallel Mach-Zehnder modulator and the second dual parallel Mach-Zehnder modulator.

6. The device for generating thirty-two times frequency millimeter wave based on dual parallel modulators according to claim 1, characterized in that: The modulation coefficients of the first dual parallel Mach-Zehnder modulator and the second dual parallel Mach-Zehnder modulator are 16.038 or 19.

555.

7. The device for generating thirty-two times frequency millimeter waves based on dual parallel modulators according to claim 1, characterized in that: The insertion loss of each sub-modulator of the first dual-parallel Mach-Zehnder modulator and the second dual-parallel Mach-Zehnder modulator is set to the same preset value.

8. The device for generating thirty-two times frequency millimeter waves based on dual parallel modulators according to claim 1, characterized in that: The first optical power splitter is used to evenly split the light emitted by the tunable laser and output it into two paths.

9. The device for generating thirty-two times frequency millimeter wave based on dual parallel modulators according to claim 1, characterized in that: The second optical power splitter is used to evenly split the signal at the first output end of the first optical power splitter and output it into two paths.

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