Optical wireless communication system and method based on multi-core optical fiber

Abstract

The invention relates to an optical wireless communication system and method based on a multi-core optical fiber, and relates to the technical field of optical wireless communication, and the system comprises a communication control center of which the input end is connected with the multi-core optical fiber for receiving a wavelength division multiplexing signal, the output end is used for distributing the wavelength division multiplexing signals to a plurality of different areas; a plurality of base stations, each base station is arranged in one area, a spatial light modulator is arranged in each base station, and the spatial light modulators are used for deflecting a plurality of optical signals projected by the multi-core optical fiber so as to project the optical signals to different positions in the space; and the plurality of receiving ends are used for receiving and converting the optical signals projected by the base stations. According to the invention, the transmission capacity of optical wireless communication can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical wireless communication, and in particular to an optical wireless communication system and method based on multi-core optical fiber. Background Art

[0002] At present, wireless communication technology has completely changed people's daily lives. Especially in recent years, with the widespread popularity of applications such as virtual reality, augmented reality, short videos, and live video, people's demand for the transmission rate and capacity of wireless communications has exploded. Mobile communication services such as smartphones, tablets, driverless cars, and intelligent robots, as well as the interconnection and interaction between the numerous devices that constitute the Internet of Things, have further promoted the exchange and sharing of wireless communication data.

[0003] In order to cope with the increasingly serious wireless network congestion and provide large-capacity, high-speed wireless communication services, new radio spectrum is gradually being utilized. However, the exponential growth of transmission capacity is rapidly exhausting the limited wireless spectrum. If the resources of the infrared light band are utilized, abundant additional spectrum can be obtained, and the utilization of these infrared spectrum can be achieved through optical wireless communication technology. Optical wireless communication has the advantages of ultra-high transmission rate, transmission bandwidth exceeding 20THz, high energy efficiency, high privacy and security, and compatibility with existing optical fiber communication systems. It can unload a large amount of business load from crowded RF wireless networks, thereby providing ample space for applications such as the Internet and the Internet of Things.

[0004] Conventional optical wireless communication systems are connected to the destination through single-mode optical fiber, and then a laser beam is emitted to the receiving end through a collimator. The light beam reaches the receiving end after free space transmission. The receiving end uses a photodiode to convert the optical signal into information that can be used by the user, thus completing the free space optical transmission from the transmitter to the receiver. However, due to the limitations of nonlinearity and amplifier bandwidth, the communication capacity of single-mode optical fiber is close to its limit. How to further improve the transmission capacity of optical fiber and meet the growing demand for data transmission has become the core of current research on optical fiber communication technology. Summary of the invention

[0005] The present application provides an optical wireless communication system and method based on multi-core optical fiber, which can improve the transmission capacity of optical wireless communication.

[0006] In a first aspect, an embodiment of the present application provides an optical wireless communication system based on a multi-core optical fiber, wherein the optical wireless communication system based on a multi-core optical fiber comprises:

[0007] A communication control center, whose input end is connected to a multi-core optical fiber for receiving wavelength division multiplexing signals, and whose output end is used to distribute the wavelength division multiplexing signals to a plurality of different areas;

[0008] A plurality of base stations, each of which is arranged in one of the areas, wherein a spatial light modulator is arranged in the base station, and the spatial light modulator is used to deflect a plurality of optical signals projected by a multi-core optical fiber so as to project them to different positions in space;

[0009] A plurality of receiving ends are used for receiving and converting the optical signals projected by the base station.

[0010] In combination with the first aspect, in one implementation, the base station further includes:

[0011] A lens is used for collimating a plurality of optical signals projected to the spatial light modulator.

[0012] In combination with the first aspect, in one implementation, the base station further includes:

[0013] An angle magnification module is used to magnify the deflection angle of the spatial light modulator.

[0014] In combination with the first aspect, in one implementation, the receiving end includes:

[0015] A post optical amplifier, which is used to amplify the received optical signal;

[0016] A photodiode is used to convert the optical signal amplified by the post optical amplifier.

[0017] In a second aspect, an embodiment of the present application provides another optical wireless communication system based on a multi-core optical fiber, wherein the optical wireless communication system based on a multi-core optical fiber comprises:

[0018] A communication control center, whose input end is connected to a multi-core optical fiber for receiving wavelength division multiplexing signals, and whose output end is used to distribute the wavelength division multiplexing signals to a plurality of different areas;

[0019] A plurality of base stations are provided, each of the base stations is arranged in one of the areas, a spatial light modulator is arranged in the base station, and the spatial light modulator is used to deflect a plurality of optical signals projected by the multi-core optical fiber so as to project them to different positions in space.

[0020] In a third aspect, an embodiment of the present application provides an optical wireless communication method based on a multi-core optical fiber, and the optical wireless communication method based on a multi-core optical fiber includes:

[0021] Receiving wavelength division multiplexing signals using multi-core optical fibers and distributing the wavelength division multiplexing signals to a plurality of different areas;

[0022] According to the spatial light modulator of the base station arranged in each area, multiple optical signals projected by the multi-core optical fiber are deflected so as to be projected to different positions in space;

[0023] The optical signal projected by the base station is received and converted at the receiving end.

[0024] In conjunction with the second aspect, in one implementation, the method further includes:

[0025] A lens is used to collimate a plurality of optical signals projected onto the spatial light modulator.

[0026] In conjunction with the second aspect, in one implementation, the method further includes:

[0027] The angle magnification module is used to magnify the deflection angle of the spatial light modulator.

[0028] In conjunction with the second aspect, in one implementation, the receiving and converting, at a receiving end, an optical signal projected by the base station includes:

[0029] Amplifying the received optical signal using a post optical amplifier;

[0030] The optical signal amplified by the post optical amplifier is converted by using a photodiode.

[0031] In a fourth aspect, an embodiment of the present application provides another optical wireless communication method based on a multi-core optical fiber, the optical wireless communication method based on a multi-core optical fiber comprising:

[0032] Receiving wavelength division multiplexing signals using multi-core optical fibers and distributing the wavelength division multiplexing signals to a plurality of different areas;

[0033] According to the spatial light modulator of the base station arranged in each area, the multiple optical signals projected by the multi-core optical fiber are deflected so as to be projected to different positions in space.

[0034] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0035] The optical wireless communication system based on multi-core optical fiber in the present application uses multi-core optical fiber to receive wavelength division multiplexing signals and distributes the wavelength division multiplexing signals to multiple different areas; according to the spatial light modulator of the base station set in each area, the multiple optical signals projected by the multi-core optical fiber are deflected to project to different positions in space; the optical signal projected by the base station is received and converted at the receiving end. That is, the present application adopts multi-core multiplexing technology, and multiple cores are designed in the same optical fiber cladding structure. Each core is equivalent to an independent transmission unit, so that multiple signals can be independently transmitted along different cores in the same optical fiber, thereby improving the transmission capacity of optical wireless communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 This is a structural block diagram of an embodiment of an optical wireless communication system based on multi-core optical fiber of the present application;

[0038] Figure 2 This is a schematic diagram of multi-core optical fiber spatial light field control in this application;

[0039] Figure 3 This is a flow chart of an embodiment of an optical wireless communication method based on multi-core optical fiber of the present application;

[0040] Figure 4 This is a flow chart of another embodiment of the optical wireless communication method based on multi-core optical fiber of the present application. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0043] In a first aspect, an embodiment of the present application provides an optical wireless communication system based on a multi-core optical fiber.

[0044] In one embodiment, referring to Figure 1 , Figure 1 This is a structural block diagram of an embodiment of an optical wireless communication system based on multi-core optical fiber of the present application. Figure 1 As shown, the optical wireless communication system based on multi-core optical fiber includes:

[0045] A communication control center, whose input end is connected to a multi-core optical fiber for receiving wavelength division multiplexing signals, and whose output end is used to distribute the wavelength division multiplexing signals to a plurality of different areas;

[0046] A plurality of base stations, each of which is arranged in one of the areas, wherein a spatial light modulator is arranged in the base station, and the spatial light modulator is used to deflect a plurality of optical signals projected by a multi-core optical fiber so as to project them to different positions in space;

[0047] A plurality of receiving ends are used for receiving and converting the optical signals projected by the base station.

[0048] It is worth noting that when other dimensions of optical fiber transmission cannot be broken through, this application uses multi-core multiplexing technology to increase the optical fiber capacity, so that the system transmission capacity can be increased by an order of magnitude. Multi-core multiplexing technology is to design multiple cores in the same optical fiber cladding structure. Each core is equivalent to an independent transmission unit, which can realize the independent transmission of multiple signals along different cores in the same optical fiber.

[0049] Specifically, the wavelength division multiplexing signal of the multi-core optical fiber enters the communication control center of the building or outdoors through the optical fiber distribution network over a long distance, and then is distributed to different rooms or areas. A near-infrared light base station is configured on the ceiling of each area (near-infrared refers to the optical carrier with a wavelength of 1550nm in the optical fiber). The base station is equipped with a lens and a spatial light modulator. The light in the multi-core optical fiber is controlled in real time by the spatial light modulator and distributed to different users on the ground.

[0050] The following takes the common 7-core optical fiber as an example, and other core numbers are also possible, such as 19 cores, 24 cores, etc. The laser of each core in the 7-core optical fiber is modulated to carry different high-speed signals, such as each core carries a wavelength signal.

[0051] After the signal reaches the base station, the laser in the multi-core optical fiber is emitted through the end face of the multi-core optical fiber (the end face of the multi-core optical fiber needs to be cut flat to prevent irregular scattering of the output light), and then passes through the lens to collimate the light beam.

[0052] See also Figure 2 As shown in the figure, the 7 light spots collimated by the lens are projected onto the surface of the spatial light modulator (silicon-based liquid crystal). By adjusting the phase grayscale of the silicon-based liquid crystal, the 7 light spots can be deflected, transmitted a certain distance in free space to the ground, and projected to different positions in space for users to receive. The receiving end generally uses a photodiode. If the received optical power is too small, a post-optical amplifier will be added to the system to amplify the received optical signal. Signals of 7 different wavelengths can be used in the 7 fiber cores, and the light is distributed to different users in space through the spatial light modulator. Each user can also use the same downlink optical wavelength signal as the uplink carrier. Wavelength division multiplexing signals can also be used in the 7 fiber cores, and each core carries a multi-wavelength modulated signal.

[0053] In addition, the maximum deflection angle of the common silicon-based liquid crystal spatial light modulator for the light beam is 3°. In order to expand the field of view of the system, an angle magnification module can be introduced to amplify the deflection angle of the silicon-based liquid crystal spatial light modulator.

[0054] At the same time, by loading the algorithm to estimate the phase of the spatial light modulator, any one or several of the seven light spots of the multi-core optical fiber can be split again to realize the function of optical broadcasting. Since the optical path is reversible, the optical wireless communication system supports bidirectional transmission of the optical path, and the user end can use a signal of the same wavelength as the uplink carrier of the signal.

[0055] In summary, the optical wireless communication system based on multi-core optical fiber in the present application uses multi-core optical fiber to receive wavelength division multiplexing signals, and distributes the wavelength division multiplexing signals to multiple different areas; according to the spatial light modulator of the base station set in each area, the multiple optical signals projected by the multi-core optical fiber are deflected to project to different positions in space; the optical signal projected by the base station is received and converted at the receiving end. That is, the present application adopts multi-core multiplexing technology, and multiple cores are designed in the same optical fiber cladding structure, and each core is equivalent to an independent transmission unit, so that multiple signals can be independently transmitted along different cores in the same optical fiber, thereby improving the transmission capacity of optical wireless communication.

[0056] In a second aspect, an embodiment of the present application provides another optical wireless communication system based on multi-core optical fiber.

[0057] In one embodiment, an optical wireless communication system based on a multi-core optical fiber includes:

[0058] A communication control center, whose input end is connected to a multi-core optical fiber for receiving wavelength division multiplexing signals, and whose output end is used to distribute the wavelength division multiplexing signals to a plurality of different areas;

[0059] A plurality of base stations are provided, each of the base stations is arranged in one of the areas, a spatial light modulator is arranged in the base station, and the spatial light modulator is used to deflect a plurality of optical signals projected by the multi-core optical fiber so as to project them to different positions in space.

[0060] In a third aspect, an embodiment of the present application provides an optical wireless communication method based on multi-core optical fiber.

[0061] In one embodiment, referring to Figure 3 , Figure 3 This is a flow chart of an embodiment of an optical wireless communication method based on multi-core optical fiber of the present application. Figure 3 As shown, the optical wireless communication method based on multi-core optical fiber includes:

[0062] S1. Receive wavelength division multiplexing signals using multi-core optical fibers, and distribute the wavelength division multiplexing signals to multiple different areas;

[0063] S2. According to the spatial light modulator of the base station arranged in each area, multiple optical signals projected by the multi-core optical fiber are deflected to project to different positions in space;

[0064] S3. Receive and convert the optical signal projected by the base station at the receiving end.

[0065] Furthermore, in one embodiment, it also includes:

[0066] A lens is used to collimate a plurality of optical signals projected onto the spatial light modulator.

[0067] Furthermore, in one embodiment, it also includes:

[0068] The angle magnification module is used to magnify the deflection angle of the spatial light modulator.

[0069] Furthermore, in one embodiment, the receiving and converting the optical signal projected by the base station at the receiving end includes:

[0070] Amplifying the received optical signal using a post optical amplifier;

[0071] The optical signal amplified by the post optical amplifier is converted by using a photodiode.

[0072] In summary, the optical wireless communication method based on multi-core optical fiber in the present application uses multi-core optical fiber to receive wavelength division multiplexing signals, and distributes the wavelength division multiplexing signals to multiple different areas; according to the spatial light modulator of the base station set in each area, the multiple optical signals projected by the multi-core optical fiber are deflected to be projected to different positions in space; the optical signal projected by the base station is received and converted at the receiving end. That is, the present application adopts multi-core multiplexing technology, and multiple cores are designed in the same optical fiber cladding structure, and each core is equivalent to an independent transmission unit, so that multiple signals can be independently transmitted along different cores in the same optical fiber, thereby improving the transmission capacity of optical wireless communication.

[0073] In a fourth aspect, an embodiment of the present application provides another optical wireless communication method based on multi-core optical fiber.

[0074] In one embodiment, referring to Figure 4 , Figure 4 This is a flow chart of an embodiment of an optical wireless communication method based on multi-core optical fiber of the present application. Figure 4 As shown, the optical wireless communication method based on multi-core optical fiber includes:

[0075] S1 ’ , using a multi-core optical fiber to receive a wavelength division multiplexing signal, and distributing the wavelength division multiplexing signal to a plurality of different areas;

[0076] S2 ’ , according to the spatial light modulator of the base station set up in each area, the multiple optical signals projected by the multi-core optical fiber are deflected so as to be projected to different positions in space.

[0077] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0078] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0079] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An optical wireless communication system based on multi-core optical fiber, characterized in that: The optical wireless communication system based on multi-core optical fiber includes: A communication control center, whose input end is connected to a multi-core optical fiber for receiving wavelength division multiplexing signals, and whose output end is used to distribute the wavelength division multiplexing signals to a plurality of different areas; A plurality of base stations, each of which is arranged in one of the areas, wherein a spatial light modulator is arranged in the base station, and the spatial light modulator is used to deflect a plurality of optical signals projected by a multi-core optical fiber so as to project them to different positions in space; A plurality of receiving ends are used for receiving and converting the optical signals projected by the base station.

2. The optical wireless communication system based on multi-core optical fiber according to claim 1, characterized in that: The base station also includes: A lens is used for collimating a plurality of optical signals projected to the spatial light modulator.

3. The optical wireless communication system based on multi-core optical fiber according to claim 1 or 2, characterized in that: The base station also includes: An angle magnification module is used to magnify the deflection angle of the spatial light modulator.

4. The optical wireless communication system based on multi-core optical fiber according to claim 1, characterized in that: The receiving end comprises: A post optical amplifier, which is used to amplify the received optical signal; A photodiode is used to convert the optical signal amplified by the post optical amplifier.

5. An optical wireless communication system based on multi-core optical fiber, characterized in that: The optical wireless communication system based on multi-core optical fiber includes: A communication control center, whose input end is connected to a multi-core optical fiber for receiving wavelength division multiplexing signals, and whose output end is used to distribute the wavelength division multiplexing signals to a plurality of different areas; A plurality of base stations are provided, each of the base stations is arranged in one of the areas, a spatial light modulator is arranged in the base station, and the spatial light modulator is used to deflect a plurality of optical signals projected by the multi-core optical fiber so as to project them to different positions in space.

6. An optical wireless communication method based on multi-core optical fiber, characterized in that: The optical wireless communication method based on multi-core optical fiber comprises: Receiving wavelength division multiplexing signals using multi-core optical fibers and distributing the wavelength division multiplexing signals to a plurality of different areas; According to the spatial light modulator of the base station arranged in each area, multiple optical signals projected by the multi-core optical fiber are deflected so as to be projected to different positions in space; The optical signal projected by the base station is received and converted at the receiving end.

7. The optical wireless communication method based on multi-core optical fiber according to claim 6, characterized in that: Also includes: A lens is used to collimate a plurality of optical signals projected onto the spatial light modulator.

8. The optical wireless communication method based on multi-core optical fiber according to claim 6 or 7, characterized in that: Also includes: The angle magnification module is used to magnify the deflection angle of the spatial light modulator.

9. The optical wireless communication method based on multi-core optical fiber according to claim 6, characterized in that: The receiving and converting the optical signal projected by the base station at the receiving end includes: Amplifying the received optical signal using a post optical amplifier; The optical signal amplified by the post optical amplifier is converted by using a photodiode.

10. An optical wireless communication method based on multi-core optical fiber, characterized in that: The optical wireless communication method based on multi-core optical fiber comprises: Receiving wavelength division multiplexing signals using multi-core optical fibers and distributing the wavelength division multiplexing signals to a plurality of different areas; According to the spatial light modulator of the base station arranged in each area, the multiple optical signals projected by the multi-core optical fiber are deflected so as to be projected to different positions in space.

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