Wind finding radar device based on narrow-linewidth tunable laser

Abstract

The utility model discloses a wind measurement radar device based on a silicon-based photoelectronic technology, and relates to the field of laser wind measurement. The wind measurement radar device comprises a receiving and transmitting integrated module based on the silicon-based photoelectronic technology, an acousto-optic frequency shifter, an optical amplifier, a circulator, a wavelength division multiplexer and an optical antenna, wherein the acousto-optic frequency shifter is connected between the receiving and transmitting integrated module and the optical amplifier; the optical amplifier is connected to the circulator, the circulator is in dual-phase connection with the wavelength division multiplexer, the circulator is connected to the optical transceiving integrated module, and the optical transceiving integrated module comprises an adjustable narrow linewidth laser based on the silicon-based photoelectron technology, a balance detector, a frequency mixer, an optical splitter, an optical fiber array, a sealing tube and the like. According to the utility model, the tunable narrow linewidth laser adopting the silicon optical external cavity scheme is matched with the pure solid state scheme of the wavelength division multiplexer, so that the process of switching an optical antenna by using an optical switch in the measurement process is directly avoided; line width performance indexes of the laser can be far better than that of a traditional adjustable laser of an InP-based platform through design and process optimization.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of laser wind measurement, especially a wind radar device based on narrow linewidth tunable laser. BACKGROUND

[0002] At present, the laser wind measurement radar adopts the narrow linewidth laser with fixed frequency and the discrete balance detector, and in the whole wind field information detection process, the laser signal needs to be emitted to the measured area through the multiple optical antennas, and these multiple optical antennas are arranged at fixed angles to obtain the wind field information in three-dimensional space. Since the laser with fixed frequency is adopted, the optical switch needs to be used to switch the multiple optical antennas during emission to achieve the purpose of switching the emission channel, which causes high cost, low measurement efficiency and complex system structure, and the optical switch introduces the problems of optical loss and service life. SUMMARY

[0003] The utility model solves the technical problem that a wind radar based on narrow linewidth tunable laser solves at least part of the above problems.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A wind radar device based on narrow linewidth tunable laser, comprising an optical transceiver chip, an acousto-optic frequency shifter, an optical amplifier, a circulator, a wavelength division multiplexer and an optical antenna, the optical transceiver chip comprising a tunable narrow linewidth laser, a balance detector and a fiber array; the tunable narrow linewidth laser is connected to the fiber array, the fiber array is connected to the acousto-optic frequency shifter and the amplifier in turn through a sealing tube, the optical amplifier is connected to the circulator, the circulator is bidirectionally connected with the wavelength division multiplexer, and the circulator is connected to the balance detector through the fiber array.

[0006] Further, the optical transceiver chip adopts a butterfly package.

[0007] Further, the tunable narrow linewidth laser and the balance detector are integrated in the optical transceiver chip, and the method of epitaxial germanium detector on silicon is adopted.

[0008] Further, the tunable narrow linewidth laser is a silicon optical chip, the balance detector is a compound chip, the tunable narrow linewidth laser comprises a gain region, a filter, a first beam splitter, a frequency shifter and an optical reflector connected in turn on the silicon optical chip, a second beam splitter connected with the first beam splitter, and a mixer and a balance detector connected with the second beam splitter in turn; the second beam splitter is connected to the fiber array, the fiber array is connected to the balance detector through the mixer, and the balance detector is arranged on the silicon optical chip.

[0009] Further, the optical transceiver integrated chip is provided with a sealing tube, the optical fiber array is connected with the acousto-optic frequency shifter through the sealing tube, and the circulator is connected with the optical fiber array through the sealing tube.

[0010] Further, the frequency of the laser emitted by the adjustable narrow linewidth laser is consistent with the output frequency of the output channel of the wavelength division multiplexer.

[0011] Further, the circulator has three ports, namely a p1 sending end, a p2 receiving and sending end and a p3 receiving end.

[0012] Further, the number of wavelength division channels of the wavelength division multiplexer is consistent with the number of optical antennas, and the channels are 3 channels or more.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model discloses a tunable narrow linewidth laser and a wavelength division multiplexer, directly cancels the process of switching the optical antenna by using the optical switch in the measuring process, directly improves the system reliability and the measuring efficiency, adopts the silicon light outer cavity scheme, and the linewidth performance index of the laser can be reached far more than the performance index of traditional InP base by design, process optimization and extremely low cost, and the balanced detector and the laser are integrated, directly interconnected on the silicon-based optoelectronic chip through accurate beam splitting devices and mixers, avoid the accurate fusion process of using the high-cost polarization maintaining device and the optical fiber, reduce the manufacturing cost, greatly reduce the system volume, and simplify the system structure. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural diagram of the utility model.

[0015] Figure 2 It is a specific implementation diagram of the adjustable narrow linewidth laser and the balanced detector of the utility model.

[0016] Among them, the name corresponding to the reference sign is:

[0017] 1-optical transceiver integrated module, 2-acousto-optic frequency shifter, 3-optical amplifier, 4-circulator, 5-wavelength division multiplexer, 6-optical antenna, 7-adjustable narrow linewidth laser, 8-balanced detector, 9-optical line array, 10-sealing tube. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following will be further described in detail in combination with the drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0019] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, term " install " " link " " connection " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, of course, can also be mechanical connection, also can be electrical connection, in addition, can also be direct connection, also can be indirectly connected through intermediate medium, or can be two element internal communication, for ordinary skilled in the art, can understand the concrete meaning of the above-mentioned term in the utility model according to specific circumstances.

[0020] As Figure 1 The utility model discloses a wind measurement radar device based on narrow line width adjustable laser, it is characterized in that, including light transceiver integrated chip 1, acoustooptic frequency shifter 2, optical amplifier 3, circulator 4, wavelength division multiplexer 5, optical antenna 6 light transceiver integrated chip 1 including adjustable narrow line width laser 7, balanced detector 8, optical fiber array 9, adjustable narrow line width laser 7 is connected to optical fiber array 9, optical fiber array 9 is connected acoustooptic frequency shifter 2, amplifier 3 in proper order, optical amplifier 3 is connected to circulator 4, and circulator 4 is bidirectionally connected with wavelength division multiplexer 5, and circulator 4 is connected to balanced detector 8 through optical fiber array 9.

[0021] Narrow line width adjustable laser 7 emits adjustable narrow line width laser of frequency to acoustooptic frequency shifter 2, and the laser signal is output to optical amplifier 3 after frequency shift processing by acoustooptic frequency shifter 2 amplifies optical signal, and optical signal is transmitted to wavelength division multiplexer 5 again through circulator 4, and the optical signal after processing by acoustooptic frequency shifter 2 is divided to corresponding frequency channel by wavelength division multiplexer 5, and is introduced to optical antenna 6 again, and is projected to atmosphere, and corresponding optical antenna 6 receives the light reflected by aerosol, and returns to wavelength division multiplexer again, and returns to balanced detector 8 on light transceiver integrated module 1 through circulator 4 and optical fiber array, and the detection of optical signal is completed, and the information of the wind field to be measured is finally obtained by completing the detection of multiple optical signals.

[0022] The light transceiver integrated chip 1 adopts butterfly-shaped packaging. The method of epitaxial germanium detector on silicon integrates the adjustable narrow line width laser 7 and the balanced detector 8 in the light transceiver integrated chip 1. The epitaxial germanium detector on silicon integrates the narrow line width laser on the same chip, simplifying the system. Figure 2As shown, the adjustable narrow linewidth laser 7 is a silicon optical chip, and the balanced detector 8 is a compound chip. The adjustable narrow linewidth laser 7 comprises, in sequence on the silicon optical chip, a gain region, a filter, a first beam splitter, a frequency shifter, and an optical reflector, a second beam splitter connected to the first beam splitter, and a mixer and the balanced detector 8 connected to the second beam splitter in sequence. The second beam splitter is connected to the fiber array 9, the fiber array 9 is connected to the balanced detector 8 through the mixer, and the balanced detector 8 is arranged on the silicon optical chip.

[0023] In an embodiment, the adjustable narrow linewidth laser is transmitted to the filter after being amplified by the gain region, the filter adjusts the wavelength of the adjustable narrow linewidth laser, the adjusted adjustable narrow linewidth laser passes through the first beam splitter and the phase shifter in sequence, the phase shifter performs phase shift processing on the adjusted adjustable narrow linewidth laser, and the phase-shifted adjustable narrow linewidth laser is reflected back to the first beam splitter by the optical reflector. The first beam splitter transmits the adjustable narrow linewidth laser reflected back by the optical signal to the second beam splitter, the second beam splitter divides the adjustable narrow linewidth laser into two beams, one of which is output to the measured wind field through the fiber array 9, and the other is transmitted to the mixer. The mixer receives the optical signal transmitted back by the fiber array 9, and performs mixing processing on the adjustable narrow linewidth laser transmitted by the second beam splitter and the optical signal in the measured wind field transmitted back by the fiber array 9. The mixer transmits the two mixed optical signals to the balanced detector 8, the balanced detector 8 compares the two optical signals, thereby completing the detection of the optical signal in the measured wind field. The mixer performs mixing processing on the two optical signals, the purpose of which is to extract the frequency difference of the two optical signals, and to complete the measurement of the wind speed.

[0024] The silicon optical chip is a low-cost and high-speed optical communication chip, which combines the characteristics of ultra-large-scale logic and ultra-high-precision manufacturing of CMOS technology and the advantages of super-high speed and ultra-low power consumption of photon technology. The adjustable narrow linewidth laser using the silicon optical chip greatly reduces the manufacturing cost while ensuring the measurement accuracy and efficiency. The optical transceiver integrated chip is provided with a sealing tube 10, the optical fiber array 9 is connected with the acousto-optic frequency shifter 2 through the sealing tube 10, and the circulator 4 is connected with the optical fiber array 9 through the sealing tube 10. The sealing tube 10 mainly guarantees the sealing performance of the chips or devices in the butterfly packaging module, which is beneficial to guarantee the performance of the chips and reduce damage. The sealing tube 10 and the electrical signal pins are arranged on different surfaces. The frequency of the laser emitted by the adjustable narrow linewidth laser 7 is consistent with the output frequency of the output channel corresponding to the wavelength division multiplexer 5. The circulator 4 has three ports, which are respectively a p1 transmission end, a p2 transceiver end and a p3 receiving end. The p1 transmission end is connected with the amplifier 3, the p2 transceiver end is connected with the wavelength division multiplexer 5, and the p3 receiving end is connected with the balanced detector 8 through the optical fiber array 9. The optical signal amplified by the optical amplifier 3 is transmitted to the wavelength division multiplexer 5 through the p1 transmission end and the p2 transceiver end of the circulator 4 in sequence. The optical antenna 6 receives the light reflected by the aerosol, and the light returns to the wavelength division multiplexer and then returns to the balanced detector 8 on the optical transceiver integrated module 1 through the p2 transceiver end and the p3 receiving end of the circulator 4 in sequence.

[0025] The number of wavelength division channels of the wavelength division multiplexer 5 is consistent with the number of optical antennas 6, which guarantees the accuracy of signal transmission. The channel is 3 channels or more. Figure 1 In the embodiment, n wavelength division multiplexers 5 are connected with n optical antennas 6 through optical fibers respectively, and n optical signals with wavelengths 1, 2, …, n are obtained respectively.

[0026] In the embodiment, the wind speed based on the narrow linewidth adjustable laser is measured by the wind speed radar device. The wind speed based on the narrow linewidth adjustable laser is emitted by the wind speed radar device, and the laser emitted by the wind speed radar device has a certain angle with the horizontal direction. At this time, at least three lasers with a certain angle are needed in space to determine the speed of the wind in each direction of the wind field.

[0027] The material system used by various devices on the silicon-based optoelectronic chip includes but is not limited to silicon, silicon nitride, lithium niobate (including thin film), germanium, etc. The tuning scheme of the adjustable filter includes but is not limited to thermal light, electro-optical, piezoelectric, etc.

[0028] It should be finally pointed out that: the above embodiments are merely the preferred embodiments of the utility model for describing the technical scheme of the utility model, rather than limiting it, of course, it is not the patent range of the utility model; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the range of the technical scheme of the embodiments of the utility model; that is to say, as long as the substantive meaning of the modification or polishing made in the main design idea and spirit of the utility model has no substantive meaning, the technical problem solved is still consistent with the utility model, and should be included in the protection range of the utility model; in addition, the technical scheme of the utility model is directly or indirectly used in other related technical fields, which is also included in the patent protection range of the utility model.

Claims

1. A wind measurement radar device based on a narrow linewidth tunable laser, comprising an optical transceiver chip (1), an acousto-optic frequency shifter (2), an optical amplifier (3), a circulator (4), a wavelength division multiplexer (5) and an optical antenna (6), characterized in that: The light transceiver integrated chip (1) comprises a tunable narrow linewidth laser (7), a balanced detector (8) and a fiber array (9); the tunable narrow linewidth laser (7) is connected to the fiber array (9), the fiber array (9) is connected to an acousto-optic frequency shifter (2) and an amplifier (3) in sequence through a sealing tube (10), the optical amplifier (3) is connected to a circulator (4), the circulator (4) is bidirectionally connected to a wavelength division multiplexer (5), and the circulator (4) is connected to the balanced detector (8) through the fiber array (9).

2. A wind measuring radar device based on a narrow linewidth tunable laser as claimed in claim 1, characterized in that, The light transceiver integrated chip (1) adopts a butterfly package.

3. A wind measuring radar device based on a narrow linewidth tunable laser as claimed in claim 1, characterized in that, The tunable narrow linewidth laser (7) and the balanced detector (8) are integrated in the light transceiver integrated chip (1), and a method of epitaxial germanium detector on silicon is adopted.

4. A wind measuring radar device based on a narrow linewidth tunable laser as claimed in claim 1, characterized in that, The tunable narrow linewidth laser (7) is a silicon optical chip, the balanced detector (8) is a compound chip, the tunable narrow linewidth laser (7) comprises a gain region, a filter, a first beam splitter, a frequency shifter and an optical reflector connected in sequence on the silicon optical chip, a second beam splitter connected to the first beam splitter, and a mixer and the balanced detector (8) connected to the second beam splitter in sequence; the second beam splitter is connected to the fiber array (9), the fiber array (9) is connected to the balanced detector (8) through the mixer, and the balanced detector (8) is arranged on the silicon optical chip.

5. A wind measuring radar device based on a narrow linewidth tunable laser as claimed in claim 1, characterized in that, The light transceiver integrated chip (1) is provided with a sealing tube (10), the fiber array (9) is connected to the acousto-optic frequency shifter (2) through the sealing tube (10), and the circulator (4) is connected through the sealing tube (10) and the fiber array (9).

6. A wind measuring radar device based on a narrow linewidth tunable laser as claimed in claim 1, characterized in that, The frequency of the laser emitted by the tunable narrow linewidth laser (7) is consistent with the output frequency of the output channel corresponding to the wavelength division multiplexer (5).

7. A wind measuring radar device based on a narrow linewidth tunable laser as claimed in claim 1, characterized in that, The circulator (4) has three ports, which are respectively a p1 sending end, a p2 receiving and sending end and a p3 receiving end.

8. A wind measuring radar device based on a narrow linewidth tunable laser as claimed in claim 1, characterized in that, The number of wavelength division channels of the wavelength division multiplexer (5) and the number of optical antennas (6) are consistent, and the channels are 3 channels or more.

Images