CN108540224A - One mode group is multiplexed the optical fiber forward pass system blended with radio MIMO - Google Patents

Abstract

The present invention proposes an optical fiber fronthaul system that combines mode group multiplexing and wireless MIMO; the system can provide four times the capacity of a single-mode optical fiber transmission system; or the Front-haul transmission pressure on capacity or rate is reduced to a single A quarter of that of the mode fiber transmission system; the system uses a large effective refractive index difference and a large effective area four-mode group few-mode fiber, which effectively reduces nonlinear effects and mode crosstalk; it is a long-span mobile communication Front‑haul in special application scenarios Provide new ideas and guarantees for distance transmission.

Description

A Fiber Fronthaul System Combining Mode Group Multiplexing and Wireless MIMO

technical field

The invention relates to an optical fiber fronthaul system combining mode group multiplexing and wireless MIMO, which can be applied to the fields of optical fiber communication, optical fiber wireless access, optical information processing, new generation information technology and the like.

Background technique

With the increasing demand for data communication and multimedia services, mobile communication develops rapidly and continues to meet people's communication needs; however, the front-end transmission interfaces used in existing mobile communication networks have great limitations in terms of data rate, bandwidth, and delay In response to this situation, China Mobile Communications Research Institute and other units have proposed the next generation fronthaul interface NGFI (Next Generation Front-haul Interface) [1 China mobile research institute, etal. White Paper of Next Generation Fronthaul Interface, v1.0 ( 2015) ] To meet the needs of the fifth generation mobile communication (5G) development; NGFI refers to the front-haul interface between the baseband processing function and the remote radio frequency processing function in the next generation wireless network main equipment, providing five interfaces The division scheme can adopt both analog transmission and digital transmission technology to reduce the requirements on system parameters, and can be flexibly chosen, which provides an important reference for further research on mobile communication front-haul network. In recent years, the demand for high-speed, high-capacity, and long-span optical fiber fronthaul between the wireless cloud center (RCC, radio cloudcenter) and the remote radio frequency system (RRS, radio remote system) in NGFI has increased dramatically. At the same time, with the application of wireless multiple-input multiple-output (MIMO) technology in 4G, 5G and future wireless communications, the pressure on optical fiber fronthaul transmission has been further intensified [2 X. Liu, H. Zeng, N. Chand, and F.Effenberger , "Bandwidth-Efficient Mobile Fronthaul Transmission for Future 5GWireless Networks," in Asia Communications and Photonics Conference 2015, C.Lu, J. Luo, Y. Ji, K. Kitayama, H. Tam, K. Xu, P. Ghiggino, and N. Wada,eds., OSA Technical Digest (Optical Society of America, 2015), paperASu3E.4]; of course, the current conventional wireless MIMO technology research is still in a small number of inputs and outputs [3 Chi-HsiangLin, Chun- Ting Lin, Hou-Tzu Huang, Wei-Siang Zeng, Shou-Chih Chiang, and Hsi-Yu Chang, "60-GHz optical/wireless MIMO system integrated with optical subcarrier multiplexing and 2x2 wireless communication," Opt. Express 23, 12111- 12116 (2015)]; the research on massive MIMO antennas is still in the stage of strategic concept and preliminary theoretical simulation, and it will take a long time for actual deployment and realization [4 E. Larsson, O. Edfors, F. Tufvesson, T.Marzetta , “Massive MIMO for next generation wireless systems,” IEEE Communications Magazine, 52(2): 186-195 (2014); 5 L. Lu, G. Y. Li, A. L. Swindlehurst, A. Ashikhmin, R. Zhang, “An Overview of Massive MIMO: Benefits and Challenges,” IEEE Journal al of Selected Topics in Signal Processing, 8(5):742-758 (2014); 6 J. Shen, S. Suyama, T. Obara, Y. Okumura, “Requirements of power amplifier on super high bit rate massive MIMO OFDM transmission using higher frequency bands,” Globecom Workshops (GC Wkshps), 2014: 433-437]. In this way, the current urgent communication needs and MIMO technology have brought enormous pressure on the capacity and rate of Front-haul optical fiber transmission. Great pressure is a huge challenge for future Front-haul transmission [1; 7 Yiran Ma, Zhiguang Xu, Chengliang Zhang, Huafeng Lin, Qing Wang, Min Zhou, Heng Wang, Jingwen Yu, and Xiaomu Wang, "Demonstration of digital fronthaul over self-seeded WDM-PON in commercial LTE environment," Opt. Express 23, 11927-11935 (2015); 8 Y. Ma, Z. Xu, H. Lin, M. Zhou, H. Wang, C. Zhang , J. Yu, and X. Wang, "Demonstration of CPRI over Self-seeded WDM-PON in Commercial LTE Environment," in Optical Fiber Communication Conference, OSA Technical Digest (Optical Society of America, 2015), paper M2J.6; 9 M. Zhu, X. Liu, N. Chand, F. Effenberger, and G. Chang, "High-Capacity Mobile Fronthaul Supporting LTE-Advanced CarrierAggregation and 8×8 MIMO," in Optical Fiber Communication Conference, OSATechnical Digest (Optical Society of America, 2015), paper M2J.3].

At the same time, the mode multiplexing (MDM) technology regards each spatial mode in the few-mode fiber (FMF) as a sub-channel for parallel transmission. The MDM system based on FMF is essentially a natural multiple-input multiple-output (MIMO) system; FMF-based MDM technology has become a frontier research hotspot in the field of optical communication, and it is one of the most potential ways to realize ultra-high speed, ultra-large capacity, ultra-long distance, and high spectral efficiency transmission in this field, and has extremely broad application prospects and development space [10 He Wen, Hongjun Zheng, Qi Mo, et al. Few-Mode Fiber-Optic Microwave Photonic Links, Light: Science & Applications, 2017.8, 6, e17021,1-8; 11 Bin Huang, Nicolas K.Fontaine, Roland Ryf, Binbin Guan, Sergio G. Leon-Saval, R. Shubochkin, Y. Sun, R. Lingle, and Guifang Li, "All-fiber mode-group-selective photonic lantern using graded-index multimode fibers," Opt. Express 23 , 224-234(2015)]. Usually, the mutual coupling between degenerate modes in few-mode fibers is slightly stronger, the mode crosstalk is slightly larger, and the data processing of degenerate modes at the receiving end is slightly more difficult.

Contents of the invention

In view of the above problems, with the support of the National Natural Science Foundation of China (No. 61671227 and 61431009), the Natural Science Foundation of Shandong Province (ZR2011FM015), and the special funds of the "Taishan Scholars" construction project, the present invention proposes a mode group multiplexing and wireless MIMO phase Converged optical fiber front transmission system; the mode group multiplexing method of the present invention is that the degenerate modes in the same mode group only use one of the modes to transmit signals, and the other mode is reserved or different degenerate modes in the same mode group transmit the same signal; thus, The effective refractive index difference between the modes corresponding to different transmission signals becomes the larger effective refractive index difference between the mode groups, and the mode crosstalk is effectively reduced; each time a mode group signal is added to the transmission system proposed by the present invention, the optical fiber fronthaul transmission The capacity is double that of the single-mode system; it can provide multi-fold increased capacity that is the same multiple as the number of mode groups; it can effectively solve the challenges faced by optical fiber fronthaul in terms of capacity, speed, spectrum efficiency, and deployment cost requirements, and provide a solution for mobile communications in special application scenarios. Fiber fronthaul long-distance transmission provides new ideas and guarantees.

The technical scheme that this patent application solves its technical problem adopts is:

Aiming at the urgent demand for the capacity of optical fiber fronthaul in mobile communication in special application scenarios, the present invention proposes a fiber optic fronthaul system that combines mode group multiplexing and wireless MIMO; the system includes wireless cloud center RRC, optical fiber transmission links and radio remote System RRS; among them, wireless cloud center RRC specifically includes RRC baseband processing end and NGFI port, polarization controller and mode group selective photon lantern; optical fiber transmission link is a four-mode group few-mode optical fiber transmission link; radio remote system The RRS includes a mode group selectable photon lantern, a four-input and four-out photoelectric detection and data and radio frequency processing module, and an antenna transmitting module; the RRC baseband processing terminal and the NGFI port are connected to the four-mode group selectable photon lantern via a polarization controller. A single-mode end, the photon lantern tapered few-mode end is fused to a four-mode fiber transmission link with a large effective refractive index difference and a large effective area; the output end of the few-mode fiber transmission link (7) is connected to the four-mode group The tapered few-mode end of the photon lantern can be selected, and the four single-mode ends of the photon lantern are respectively connected to the four input ends of the four-input and four-out photoelectric detection and data and RF processing module; the four-in four-out photoelectric detection and data and The four output terminals of the RF processing module are connected to four n×n wireless MIMO antenna transmitting modules; the RRC baseband processing terminal and the NGFI port output four signals of the same wavelength or close to the wavelength or different wavelengths, which are transmitted to the The mode group can select the four input terminals of the photon lantern, realize mode conversion and multiplexing at the output terminal of the photon lantern, and multiplex into a four-mode group signal; the four-mode group signal passes through a large effective refractive index difference, large effective area Four-mode group few-mode optical fiber transmission; after that, enter the remote radio frequency system RRS; the mode conversion and demultiplexing of the four-mode group signals into four single-mode signals by the optional photon lantern of the mode group, each mode group signal Corresponding to one single-mode signal; after that, the demultiplexed four-way single-mode signal is output to four n×n wireless MIMO antenna transmitting modules for transmission after being processed by four-input and four-outlet photoelectric detection and data and radio frequency processing modules; each n×n wireless MIMO antenna transmitting modules (n=1, 1024), corresponding to 1 wired input terminal and n transmitting antennas; each n×n wireless MIMO antenna transmitting module has independent transmitting function and joint transmitting Function; four n×n wireless MIMO antenna transmitting modules adopt joint transmitting function to form the whole 4n×4n wireless MIMO antenna transmitting part; if n=1, the antenna can form the whole transmitting part of 4×4 wireless MIMO antenna; if n= 8. The antenna can integrally constitute the transmitting part of the 32×32 wireless MIMO antenna.

The beneficial effect of this patent application is:

1. The system that the present invention proposes increases a kind of mode group signal every time, and the transmission capacity of the optical fiber front transmission is doubled than that of the single-mode optical fiber transmission system, and can be improved to four times the transmission capacity; if keep each mode group signal and single-mode optical fiber The same data rate capacity of the transmission system can increase the diversity gain or multiplexing gain or both equalization gains of the wireless MIMO antenna to four times; Optical fiber fronthaul transmission pressure is reduced to a quarter of that of single-mode optical fiber transmission systems;

2. The system uses large effective refractive index difference and large effective area four-mode group few-mode fiber to effectively reduce nonlinear effects and mode crosstalk;

3. The corresponding system uses wavelengths close to or the same wavelength or different wavelengths for transmission. There are no strict requirements on the performance of lasers and photoelectric detection modules in the system, which will effectively reduce system complexity and cost;

4. The transmission system proposed by the present invention has large transmission capacity, high rate and spectrum utilization, and low cost, which provides new ideas and guarantees for mobile communication optical fiber fronthaul in special application scenarios.

Description of drawings

FIG. 1 is a schematic diagram of an optical fiber fronthaul system in which mode group multiplexing and wireless MIMO are integrated according to the present invention. The system is divided into three functional modules: 1 is the wireless cloud center RRC, 2 is the optical fiber transmission link, and 3 is the remote radio system RRS; among them, the wireless cloud center RRC includes the RRC baseband processing terminal and the NGFI port (1), four A polarization controller (2) (3) (4) (5) and a mode group selective photon lantern (6); the optical fiber transmission link is a four-mode group few-mode optical fiber transmission link (7); the radio frequency remote system The RRS includes a mode group selectable photon lantern (8), a four-input and four-out photoelectric detection and data and radio frequency processing module (9), four n×n wireless MIMO antenna transmitting modules (10) (11) (12) (13 ); the RRC baseband processing end and the NGFI port (1) are connected to the four single-mode ends of the four-mode optional photon lantern (6) via the polarization controller (2) (3) (4) (5), and the photon lantern (6) The tapered few-mode end is fused to a four-mode fiber transmission link (7) with a large effective refractive index difference and a large effective area; the output end of the few-mode fiber transmission link (7) can be connected to the four-mode group The tapered few-mode end of the selective photon lantern (8), the four single-mode ends of the photon lantern (8) are respectively connected to the four input ends of the four-input four-outlet photodetection and data and radio frequency processing module (9); The four outputs of the input and four output photoelectric detection and data and radio frequency processing modules (9) are connected to four n×n wireless MIMO antenna transmitting modules (10) (11) (12) (13); each n×n wireless MIMO antenna transmitting module (n=1,...,1024), corresponding to 1 wired input terminal and n transmitting antennas; each n×n wireless MIMO antenna transmitting module has independent transmitting function and joint transmitting function; four n The ×n wireless MIMO antenna transmitting module adopts the joint transmitting function to form the whole 4n×4n wireless MIMO antenna transmitting part; if n=1, the antenna can form the whole transmitting part of the 4×4 wireless MIMO antenna; if n=8, the antenna can Constitute the transmitting part of the 32×32 wireless MIMO antenna;

Figure 2 Schematic diagram of optional photon lanterns in the mode group (a) and output mode diagram (b); in figure (a), there is a section of few-mode fiber in the middle, and photon lanterns on the left and right sides; the tapered few-mode ends of the photon lanterns are connected The few-mode fiber in the middle; the far left and right in the figure are the single-mode ends of the photon lantern; the corresponding input end of the photon lantern mode LP01 is a fiber with a core diameter of 22 μm, and the corresponding input ends of LP11a and LP11b are a fiber with a core diameter of 20 μm The input end of LP21a, LP21b and LP02 is a fiber with a core diameter of 15 μm; the output mode diagram in figure (b) corresponds to the mode LP01, LP11a, LP11b, LP21a, LP21b and LP02 from left to right[11];

Figure 3 is the cross-sectional view of the few-mode fiber (a) and the impulse response diagram (b) of different mode signals [10]; the few-mode fiber is a six-mode few-mode fiber with large effective refractive index difference and large effective area; according to the above photon Lantern mode group classification processing method, the mode transmission signals of the six-mode few-mode fiber are the first mode group LP01, the second mode group LP11a and LP11b, the third mode group LP21a and LP21b, and the fourth mode group LP02. In the present invention, the six-mode few-mode fiber is called a four-mode group few-mode fiber; the transmission signals of these four mode groups are LP01, LP11a (or LP11b), LP21a (or LP21b) and LP02 signals; different mode group signal pulses The response can be obtained with very little mode crosstalk; its multi-channel nonlinear crosstalk is also very small;

Among them, the photon lantern and few-mode fiber in Figure 2 and Figure 3 of this patent application adopt the photon lantern and few-mode fiber used in the related papers [10, 11] of our research group.

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with the embodiments and drawings, but the scope of protection is not limited thereto.

Embodiment 1 FIG. 1 is a schematic diagram of an optical fiber fronthaul system in which mode group multiplexing and wireless MIMO are integrated according to the present invention. The system is divided into three functional modules: 1 is the wireless cloud center RRC, 2 is the optical fiber transmission link, and 3 is the remote radio system RRS; among them, the wireless cloud center RRC includes the RRC baseband processing terminal and the NGFI port (1), four A polarization controller (2) (3) (4) (5) and a mode group selective photon lantern (6); the optical fiber transmission link is a four-mode group few-mode optical fiber transmission link (7); the radio frequency remote system The RRS includes a mode group selectable photon lantern (8), a four-input and four-out photoelectric detection and data and radio frequency processing module (9), four n×n wireless MIMO antenna transmitting modules (10) (11) (12) (13 ); the RRC baseband processing end and the NGFI port (1) are connected to the four single-mode ends of the four-mode optional photon lantern (6) via the polarization controller (2) (3) (4) (5), and the photon lantern (6) The tapered few-mode end is fused to a four-mode fiber transmission link (7) with a large effective refractive index difference and a large effective area; the output end of the few-mode fiber transmission link (7) can be connected to the four-mode group The tapered few-mode end of the selective photon lantern (8), the four single-mode ends of the photon lantern (8) are respectively connected to the four input ends of the four-input four-outlet photodetection and data and radio frequency processing module (9); The four outputs of the input and four output photoelectric detection and data and radio frequency processing module (9) are connected to four n×n wireless MIMO antenna transmitting modules (10) (11) (12) (13); the RRC baseband processing end and NGFI The port (1) outputs four signals with the same wavelength or close to the wavelength or different wavelengths, which are respectively transmitted to the four-mode selective photon lantern (6) of the mode group through the polarization controller (2) (3) (4) (5) single-mode Mode conversion and multiplexing are realized at the few-mode end of the photon lantern (6), and multiplexed into a four-mode group signal; the four-mode group transmission signals are LP01, LP11a (or LP11b), LP21a ( or LP21b) and LP02 signals; the four-mode group signal is transmitted through a four-mode group few-mode optical fiber transmission link (7) with a large effective refractive index difference and a large effective area; after that, it enters the remote radio system RRS; by mode Group selectable photon lantern (8) converts and demultiplexes the four-mode group signals into four single-mode signals, and each mode group signal corresponds to one single-mode signal; after that, the four single-mode signals after demultiplexing After being processed by the four-input and four-outlet photoelectric detection and data and radio frequency processing module (9), they are respectively output to four n×n wireless MIMO antenna transmitting modules (10) (11) (12) (13) for transmission; each n×n n wireless MIMO antenna transmitting module (n=1, 2, 3..., 1024), corresponding to 1 wired input terminal and n transmitting antennas; each n×n wireless MIMO antenna transmitting module has independent transmitting function and joint transmitting function; four n×n wireless MIMO antenna transmitting modules adopt the joint transmitting function to form the overall 4n×4n wireless MIMO antenna transmitting part; if n=1, the antenna can form a whole 4×4 wireless MIMO antenna transmitting part The transmitting part; if n=8, the antenna can constitute the transmitting part of the 32×32 wireless MIMO antenna as a whole.

Figure 2 Schematic diagram of optional photon lanterns in the mode group (a) and output mode diagram (b); in figure (a), there is a section of few-mode fiber in the middle, and photon lanterns on the left and right sides; the tapered few-mode ends of the photon lanterns are connected The few-mode fiber in the middle; the far left and right in the figure are the single-mode ends of the photon lantern; the corresponding input end of the photon lantern mode LP01 is a fiber with a core diameter of 22 μm, and the corresponding input ends of LP11a and LP11b are a fiber with a core diameter of 20 μm The input end of LP21a, LP21b and LP02 is a fiber with a core diameter of 15 μm; the output modes in Figure (b) correspond to modes LP01, LP11a, LP11b, LP21a, LP21b and LP02 from left to right [11]. In conventional applications, six single-mode fibers are respectively fused to the six single-mode ends of the mode group selectable photon lantern, and the few-mode end of the photon lantern is fused to a few-mode fiber; in this way, the input six single-mode The signals are respectively converted and multiplexed to the few-mode fiber to form a mode group transmission signal; these mode group transmission signals in literature [11] are the first mode group LP01, the second mode group LP11a and LP11b, and the third mode group LP21a, LP21b and LP02. Research in literature [10] shows that although the refractive index difference between modes LP21 and LP02 is small, it is not degenerate; and under the condition of perturbation in few-mode fiber transmission, there is no coupling between modes LP21 and LP02.

Like this, in the application of the present invention, we classify the output mode group of this photon lantern as the first mode group LP01, the second mode group LP11a and LP11b, the third mode group LP21a and LP21b, the fourth mode group LP02; Lanterns in the present invention are called mode group selective photon lanterns; the degenerate modes in the same mode group only use one of the modes to transmit signals, and the other mode is reserved, or different degenerate modes in the same mode group transmit the same signal . The four single-mode fibers are respectively fused to the single-mode end of the four mode groups of the photon lantern, and the few-mode end of the photon lantern is fused to a four-mode group few-mode fiber; the four input single-mode signals can be converted and multiplexed respectively through the photon lantern A few-mode optical fiber forms a four-mode group transmission signal; the four-mode group transmission signals are LP01, LP11a (or LP11b), LP21a (or LP21b) and LP02 signals; if the signal is transmitted in the opposite direction, the input signal can be transmitted through the photon lantern A four-mode group transmission signal is converted and demultiplexed to four single-mode optical fibers to form four single-mode transmission signals. The photon lantern (6) is used for mode group conversion and multiplexing, and the photon lantern (8) is used for mode group conversion and demultiplexing. It is also possible to apply the mode-selective photon lantern in the literature [10] to the present invention according to the above-mentioned mode group classification process.

Figure 3 is the cross-sectional view of the few-mode fiber (a) and the impulse response diagram (b) of different mode signals [10]; the few-mode fiber is a six-mode few-mode fiber with large effective refractive index difference and large effective area; according to the above photon Lantern mode group classification processing method, the mode transmission signals of the six-mode few-mode fiber are respectively the first mode group LP01, the second mode group LP11a and LP11b, the third mode group LP21a and LP21b, and the fourth mode group LP02; In the invention, the six-mode few-mode fiber is called four-mode group few-mode fiber; the four-mode group transmission signals are LP01, LP11a (or LP11b), LP21a (or LP21b) and LP02 signals respectively. The effective refractive index difference between the mode groups of this few-mode fiber reaches the order of 10 ^-3 , and the effective area is 1.6 times that of the standard single-mode fiber. The minimum attenuation coefficient of the 1550 band is 0.227dB/km of the LP01 mode, and its maximum attenuation coefficient is LP02 Mode 0.262dB/km; signal impulse response of different mode groups can get mode crosstalk is very small; its multi-channel nonlinear crosstalk is also very small [10].

In short, the present invention proposes a fiber optic fronthaul system that combines mode group multiplexing and wireless MIMO; the system uses wavelengths close to or the same wavelength or different wavelengths for transmission, and there are no strict requirements on the performance of lasers and photoelectric detection modules in the system , which will greatly reduce the complexity and cost of the system; the system uses a large effective refractive index difference and a large effective area four-mode group few-mode fiber to effectively reduce nonlinear effects and mode crosstalk; at the same time, a polarization controller is used to adjust the signal polarization state to further reduce Small mode crosstalk; using photon lanterns to realize mode group conversion multiplexing and mode group conversion demultiplexing, effectively reducing loss, improving system power budget, extending transmission distance and increasing the number of access users; The transmission capacity of the optical fiber fronthaul is doubled compared with that of the single-mode optical fiber transmission system, and the transmission capacity can be increased to four times; if the data rate capacity of each mode group signal is kept the same as that of the single-mode optical fiber transmission system, the wireless MIMO The diversity gain or multiplexing gain or both equalization gain of the antenna is increased to four times; under the same antenna channel capacity, the front transmission pressure of the system proposed by the present invention in capacity or rate is reduced to that of a single-mode optical fiber transmission system A quarter of that; the spectrum utilization rate is improved; the cost is effectively reduced; the system proposed by the invention provides a new idea and guarantee for the optical fiber fronthaul of mobile communication in special application scenarios.

It should be noted that the specific implementation is only a representative example of the present invention, and obviously the technical solution of the present invention is not limited to the above-mentioned embodiments, and many variations are possible. Those of ordinary skill in the art, based on the disclosure of the present invention or obtained without objection from the written description of the document, should be considered as the protection scope of this patent.

Claims (1)

1. one mode group is multiplexed the optical fiber forward pass system blended with radio MIMO；It is characterized in that：The system is divided into wirelessly Cloud center RRC, fiber transmission link and radio frequency stretch system RRS totally three function modules；Wireless cloud center RRC includes RRC bases Tape handling end and the ports NGFI（1）, four Polarization Controllers（2）（3）（4）（5）With four modal sets alternative photon lanterns （6）；Fiber transmission link is four modal sets less fundamental mode optical fibre transmission links（7）；Radio frequency stretch system RRS includes that four modal sets are optional Selecting property photon lantern（8）, four enter four and go out photodetection and data and radio frequency processing module（9）, four n × n radio MIMO antennas Transmitting module（10）（11）（12）（13）；RRC Base-Band Processings end and the ports NGFI（1）Through Polarization Controller（2）（3）（4）（5）Even It is connected to four modal sets alternative photon lanterns（6）Four single mode ends, photon lantern（6）Taper lacks mould end and is fused to one greatly Effective refractive index is poor, four modal sets less fundamental mode optical fibre transmission link of large effective area（7）；Less fundamental mode optical fibre transmission link（7）Output end It is connected to four modal sets alternative photon lanterns（8）Taper lack mould end, photon lantern（8）Four single mode ends be separately connected Enter four to four and goes out photodetection and data and radio frequency processing module（9）Four input terminals；Four, which enter four, goes out photodetection and data With radio frequency processing module（9）Four output ends be connected to four n × n radio MIMO antenna transmitting modules（10）（11）（12） （13）；RRC Base-Band Processings end and the ports NGFI（1）Four phase co-wavelengths are exported either close to wavelength or the signal of different wave length Respectively through Polarization Controller（2）（3）（4）（5）Single mode transport is to modal sets alternative photon lantern（6）Four modal sets lists Mould end, in photon lantern（6）Few mould end implementation pattern group conversion and multiplexing, are multiplexed into four modal sets signal all the way；Four pattern Group signal poor, four modal sets less fundamental mode optical fibre transmission link of large effective area by one big effective refractive index（7）Transmission；Later, It enters back into radio frequency stretch system RRS；By four modal sets alternative photon lanterns（8）Four modal sets signal mode groups are converted Be demultiplexing as four road single mode signals, each modal sets signal corresponds to single mode signal all the way；Later, tetra- road single modes of Hou are demultiplexed Signal enters four through four and goes out photodetection and data and radio frequency processing module（9）Four n × n radio MIMOs are respectively outputted to after processing Antenna transmitting module（10）（11）（12）（13）Emitted；Each n × n radio MIMO antenna transmitting modules（N=1,2, 3,1024）, correspond to 1 wired input end and n transmitting antenna；Each n × n radio MIMO antenna transmitting modules tool There are independent transmission function and joint emission function；Four n × n radio MIMO antenna transmitting modules can structure using joint emission function Integral 4n × 4n radio MIMOs antenna emitting portion；If n=1, antenna can be integrally formed the emission part of 4 × 4 radio MIMO antennas Point；If n=8, antenna can be integrally formed the emitting portion of 32 × 32 radio MIMO antennas.