Optical fiber distributed network transmission system for 5G antenna signal FTTR

Abstract

The invention discloses an optical fiber distributed network transmission system for 5G antenna signal FTTR, and relates to the field of network transmission, the optical fiber distributed network transmission system comprises a network management device, a 5G base station, a near-end device, a first wave multiplexer, an optical line terminal, a second wave multiplexer, a far-end device and an optical network unit. According to the optical fiber transmission system for accessing the 5G antenna signal to the room, the cost is low, the performance is optimized, engineering is easy to implement, the 5G radio frequency signal is utilized to directly modulate the optical signal, frequency conversion is avoided, an expensive ADC chip is omitted, an existing distributed GPON optical network is utilized to transmit the 5G signal to the room, additional wiring is not needed, and the cost is low. And through the self-tuning function of the wavelength of the sent light, the problem of light beat interference of multiple paths of optical signals of the uplink channel is optimized, and the problem of noise convergence of the multiple paths of optical signals of the uplink channel is optimized.

Description

Technical Field

[0001] The present invention relates to the field of network transmission, and in particular to an optical fiber distributed network transmission system for 5G antenna signal FTTR. Background Art

[0002] Mobile Internet services are the largest business form at present and in the future. As a mobile communication technology, 5G communication technology has excellent characteristics such as high speed, low latency, large capacity and wide coverage. Speed ​​is the biggest advantage of 5G. The maximum speed of 5G can reach 100 times that of 4G, bringing many conveniences to people's lives and work.

[0003] However, when 5G is used, it is necessary to speed up the transmission and response of the network, so low-frequency signals cannot be used in construction. However, high-frequency signals have poor penetration. In areas with densely populated buildings, more base stations need to be built to ensure the signal penetration rate and signal transmission quality. This will lead to problems that cannot be ignored, such as high construction costs of 5G base stations, excessive power consumption, and long construction time.

[0004] To solve these problems, the existing technology uses fiber optic extension technology for 5G radio frequency signals, but this technology still cannot meet the construction requirements of low-cost distribution of 5G antennas to rooms (FTTH, Fiber To The Home). It requires expensive analog-to-digital conversion ADC chips, digital-to-analog conversion DAC chips or frequency conversion chips and high-speed microprocessors, which are costly.

[0005] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0006] In response to the problems in the related technology, the present invention proposes a fiber optic distributed network transmission system for 5G antenna signal FTTR to overcome the above-mentioned technical problems existing in the existing related technology.

[0007] To this end, the specific technical solution adopted by the present invention is as follows:

[0008] An optical fiber distributed network transmission system for 5G antenna signal FTTR, the optical fiber distributed network transmission system comprising a network management device, a 5G base station, a near-end device, a first wave multiplexer, an optical line terminal, a second wave multiplexer, a remote device and an optical network unit;

[0009] The network management device is connected to the near-end device and the far-end device respectively, the 5G base station is connected to the near-end device, the near-end device is connected to the first wave multiplexer, the first wave multiplexer is connected to the optical line terminal, the first wave multiplexer is connected to the second wave multiplexer, and the second wave multiplexer is connected to the far-end device and the optical network unit respectively;

[0010] Network management equipment, used to monitor the operating parameters of the near-end device and the remote device, and perform network parameter configuration operations based on the operating parameters;

[0011] 5G base station, used to acquire and output downlink radio frequency signals;

[0012] The near-end device is used to adjust the gain of the downlink RF signal output by the 5G base station to complete the electro-optical conversion operation and obtain the 5G optical signal;

[0013] The first wave uses a multiplexer to combine 5G optical signals into the optical line terminal;

[0014] Optical line terminal, used to transmit 5G optical signals to the optical network unit;

[0015] The second wave uses a multiplexer to separate 5G optical signals;

[0016] The remote device is used to perform an amplification operation after the photoelectric conversion of the 5G optical signal, and output the operation result by antenna radiation;

[0017] The optical network unit is used to receive and process the 5G optical signal.

[0018] Preferably, the proximal device includes a proximal uplink channel, an uplink network management control module and a proximal downlink channel, and the uplink network management control module is connected to the proximal uplink channel and the proximal downlink channel respectively.

[0019] Preferably, the proximal uplink channel includes a proximal uplink optical detector, a proximal uplink low noise amplifier, a proximal uplink automatic gain control circuit, a proximal uplink attenuator, a proximal uplink RF amplifier, a proximal uplink filter and a 5G uplink signal antenna.

[0020] Preferably, the remote device includes a remote uplink channel, a remote downlink channel and a remote network management control module, and the remote network management control module is connected to the remote uplink channel and the remote downlink channel respectively.

[0021] Preferably, the remote uplink channel includes an uplink signal antenna, an uplink filter, an uplink low noise amplifier, an uplink controllable attenuator, an uplink RF amplifier, an automatic gain control circuit and an uplink laser.

[0022] Preferably, the uplink laser is controlled by an automatic optical power control circuit and an automatic temperature control circuit.

[0023] Preferably, the remote downlink channel includes an optical detector, a downlink low noise amplifier, an optically controlled level control circuit, a downlink controllable attenuator, a downlink RF amplifier, a downlink filter and a downlink signal antenna.

[0024] Preferably, the optically controlled level control circuit utilizes the microprocessor U25 to detect the signal power voltage of the digital detector, and simultaneously receives the voltage signal of the optical power device, and reversely regulates the attenuation value of the downlink controllable attenuator according to the detection and reception results, so as to realize stable output of the downlink signal antenna power.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention provides a fiber optic transmission system for accessing 5G antenna signals to rooms. The system has low cost, optimized performance, and easy engineering implementation. It uses 5G radio frequency signals to directly modulate optical signals without frequency conversion and eliminating expensive ADC chips. It uses the existing distributed GPON optical network to transmit 5G signals to homes and rooms without the need for additional wiring. The self-tuning function of the transmitted optical wavelength optimizes the optical beat interference problem of multiple optical signals in the uplink channel and optimizes the noise convergence problem of multiple optical signals in the uplink channel.

[0027] 2. The present invention utilizes the narrow spectral width of the laser to realize the uplink laser wavelength management function, effectively solves the problem of light beat interference of multiple optical signals in the uplink channel, greatly improves network performance, and sets the uplink laser to be turned on in time only when there is uplink data in a high-density user environment, thereby optimizing the noise convergence problem of multiple optical signals in the uplink channel. At the same time, by registering with the proximal device host, each remote device accesses or disconnects the network and is assigned parameters such as wavelength, thus realizing the independent adaptive management function of the 5G network system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a principle block diagram of a fiber-optic distributed network transmission system for 5G antenna signal FTTR according to an embodiment of the present invention;

[0030] Figure 2 is a structural schematic diagram of a proximal device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0031] Figure 3 It is a structural schematic diagram of a remote-end device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0032] Figure 4is one of the circuit diagrams of a proximal device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0033] Figure 5 This is a second circuit diagram of a proximal device in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0034] Figure 6 This is a third circuit diagram of a proximal device in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0035] Figure 7 This is a fourth circuit diagram of a proximal device in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0036] Figure 8 This is a fifth circuit diagram of a proximal device in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0037] Fig. 9 This is a sixth circuit diagram of a proximal device in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0038] Fig.10 It is a structural diagram of a microprocessor U13 in a proximal device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0039] Fig.11 It is a structural schematic diagram of a microprocessor U26 in a remote device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0040] Fig.12 It is a structural schematic diagram of a microprocessor U25 in a remote device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0041] Fig.13 is a partial schematic diagram of a remote device in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0042] Fig.14 It is one of the automatic optical power control circuit diagrams in a remote device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0043] Fig.15This is a second automatic optical power control circuit diagram in a remote device in a 5G antenna signal FTTR optical fiber distributed network transmission system according to an embodiment of the present invention;

[0044] Fig.16 It is one of the automatic optical power control circuit diagrams in a remote device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0045] Fig.17 This is a second automatic optical power control circuit diagram in a remote device in a 5G antenna signal FTTR optical fiber distributed network transmission system according to an embodiment of the present invention;

[0046] Fig.18 This is a third automatic optical power control circuit diagram in a remote device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0047] Fig.19 This is a fourth automatic optical power control circuit diagram in a remote device in an optical fiber distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0048] Fig. 20 It is one of the circuit diagrams of a remote downlink channel in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0049] Fig.21 This is a second circuit diagram of a remote downlink channel in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0050] Fig. 22 This is a third circuit diagram of a remote downlink channel in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention;

[0051] Fig.23 This is the fourth circuit diagram of a remote downlink channel in a fiber-optic distributed network transmission system of a 5G antenna signal FTTR according to an embodiment of the present invention.

[0052] In the figure:

[0053] 1. Network management equipment; 2. 5G base station; 3. Near-end equipment; 4. Multiplexer for the first wave; 5. Optical line terminal; 6. Multiplexer for the second wave; 7. Remote equipment; 8. Optical network unit. DETAILED DESCRIPTION

[0054] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention.

[0055] According to an embodiment of the present invention, a fiber-optic distributed network transmission system for 5G antenna signal FTTR is provided.

[0056] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 1 As shown, according to the optical fiber distributed network transmission system of the 5G antenna signal FTTR according to an embodiment of the present invention, the optical fiber distributed network transmission system includes a network management device 1, a 5G base station 2, a near-end device 3, a first wave multiplexer 4, an optical line terminal 5, a second wave multiplexer 6, a remote device 7 and an optical network unit 8;

[0057] The network management device 1 is used to monitor the operating parameters of the near-end device 3 and the remote device 7, and perform network parameter configuration operations based on the operating parameters;

[0058] 5G base station 2, used for acquiring and outputting downlink radio frequency signals;

[0059] The proximal device 3 is used to perform gain adjustment on the downlink radio frequency signal output by the 5G base station 2 to complete the electro-optical conversion operation and obtain a 5G optical signal;

[0060] The first wave multiplexer 4 is used to combine the 5G optical signal into the optical line terminal 5;

[0061] An optical line terminal 5, used to transmit the 5G optical signal to an optical network unit 8;

[0062] The second wave multiplexer 6 is used to separate the 5G optical signal;

[0063] The remote device 7 is used to perform an amplification operation after performing photoelectric conversion on the 5G optical signal, and output the operation result by antenna radiation;

[0064] The optical network unit 8 is used to receive the processed 5G optical signal.

[0065] It should be explained that, in addition to the 1-to-64 optical fiber transmission network, this embodiment also includes two parts: a near-end device 3 and a far-end device 7.

[0066] The proximal device 3, 5G base station 2, and OLT (Optical Line Terminal) optical line terminal 5 of the GPON network gigabit passive optical network are all located in the community computer room. Multiple remote devices 7 are distributed at the end of the optical fiber network. The device form can be separated or combined with the ONU (Optical Network Unit) optical network unit 8 and placed in the user hall or room.

[0067] Each TR port of the base station can be connected to a near-end device 3, and up to 64 far-end devices 7 can be connected to the network terminal according to the network and needs.

[0068] The near-end device 3 performs electro-optical conversion on the 5G downlink RF signal output by the base station after gain adjustment. The 5G optical signal is integrated into the existing GPON optical fiber network in the community through the first wave multiplexer 4 (WDM), broadcast to each room after the optical splitter, and then separated by the second wave multiplexer 6. The remote device 7 performs photoelectric conversion and amplification, and finally radiates and outputs it through the antenna.

[0069] The uplink 5G RF signal of the mobile terminal UE is also received by the antenna of the remote device 7, and then converted from electrical to optical and then transmitted back to the near-end device 3 along the original optical network. After being converted from optical to electrical again, it is finally connected to the 5G base station 2.

[0070] Specifically, a network management device 1 is installed on the server. The content of device management includes:

[0071] (1) Monitor the main working parameters of the proximal device 3: downlink RF signal level, downlink optical power; uplink optical power, uplink RF signal level; device model, SN number, operating temperature, device IP address, etc.

[0072] (2) Monitor the main working parameters of the remote device 7: downlink received optical power, downlink RF signal output level; uplink transmitted RF signal level, uplink transmitted optical power; device model, SN serial number, operating temperature, device IP address, etc.

[0073] (3) Configuration of network parameters: The software interface manually or automatically configures the level gain of the RF electrical signal sent and received and the operating wavelength and optical power of the transmitting laser for the proximal device 3 through the server. This embodiment is called wavelength self-tuning. The device interface manually or automatically configures the operating wavelength of the transmitting laser, the uplink light trigger threshold and the gain adjustment of the RF electrical signal for the far-end device 7 through the server and the proximal device 3.

[0074] (4) When there is no participation of the near-end server, the near-end device 3 automatically configures the operating wavelength of the transmitting laser of the far-end device 7 through another management channel to avoid the OBI problem caused by multi-path optical signal beats.

[0075] like Figure 2 and Figures 4 to 10 As shown, in this embodiment, the proximal device 3 includes a proximal uplink channel, an uplink network management control module and a proximal downlink channel, and the uplink network management control module is connected to the proximal uplink channel and the proximal downlink channel respectively; the proximal uplink channel is used to convert the optical signal separated by the second wave multiplexer 6 into an electrical signal, and output the electrical signal to the 5G base station 2 after amplification based on the conversion result; the uplink network management control module is used to monitor the working status and state of the proximal uplink channel and the proximal downlink channel, and upload the monitoring result to the network management device 1; the proximal downlink channel is used to adjust the signal power of the downlink signal, and drive the laser to emit an optical signal to the second wave multiplexer 6 according to the adjustment result.

[0076] In this embodiment, the near-end uplink channel includes a 1550nm near-end uplink optical detector, a near-end uplink low-noise amplifier, a near-end uplink automatic gain control circuit OALC, a near-end uplink attenuator, a near-end uplink RF amplifier, a near-end uplink filter and a 5GRx uplink signal antenna; the near-end uplink optical detector is used to receive the optical signal separated by the second wave multiplexer 6, and convert the optical signal to obtain an electrical signal; the near-end uplink low-noise amplifier is used to receive the electrical signal generated by the near-end uplink optical detector, and perform signal function on the electrical signal. rate enhancement processing; a near-end uplink automatic gain control circuit, used to reversely regulate the near-end uplink attenuator according to the received optical power, and adjust the level state of the near-end uplink channel based on the regulation result; a near-end uplink attenuator, used to reduce the amplitude of the electrical signal and adjust the electrical signal to a preset power; a near-end uplink RF amplifier, used to amplify and enhance the electrical signal; a near-end uplink filter, used to filter out the out-of-band stray signals of the electrical signal after the amplification; a 5G uplink signal antenna, used to transmit the processed optical signal to the 5G base station 2.

[0077] In this embodiment, the signal power of the downlink signal is adjusted, and the laser is driven to transmit the optical signal to the second wavelength multiplexer 6 according to the adjustment result, including:

[0078] The 5G downlink signal is received by the 5G downlink signal antenna, and the 5G downlink signal is transmitted to the proximal downlink filter, and the spurious signals outside the 5G downlink signal channel are filtered out based on the proximal downlink filter;

[0079] Feeding back the filtered 5G downlink signal to the near-end downlink attenuator, adjusting the power of the 5G downlink signal based on the near-end downlink attenuator, and inputting it to the near-end downlink RF amplifier after reaching the preset power;

[0080] The near-end downlink RF amplifier drives the near-end downlink laser according to the adjustment result, and uses the near-end downlink laser to emit a wavelength optical signal, and transmits the 5G downlink signal to the designated location through the second wave multiplexer 6.

[0081] It should be explained that the downlink light output by the laser of the downlink channel and the uplink light of the uplink channel are combined into a bidirectional optical signal through the WDM wavelength division multiplexer, that is, the first wavelength multiplexer 4 and enter the optical network unit 8.

[0082] like Figure 2 and Figures 4 to 10 As shown (it should be noted that Figure 4 A in Figure 5 Connect at A in Figure 5 B in Figure 6 Connect at B in Figure 6 The C in Figure 8 Connect at C in Figure 7 D in Figure 8 Connect at D in Figures 4 to 9 A complete circuit diagram of the proximal device 3 is formed, and the working principle of the proximal device 3 is explained:

[0083] The downlink signal is filtered out of the channel's stray signals by the near-end downlink filter U7 and enters the near-end downlink attenuator U8. The signal is adjusted to a suitable power by the near-end downlink attenuator and input into the near-end downlink RF amplifier to obtain a signal power of about 5 to 10 dBm to drive the near-end downlink laser U1A. The near-end downlink laser emits a 1610 nm wavelength optical signal and is transmitted downstream through the WDM combiner U1.

[0084] The control of the downlink automatic gain control circuit ALC is based on the digital detector U10 detecting the driving signal power of the downlink laser U1A input, and synchronously converting it into a DC low-frequency signal to the microprocessor U13. The microprocessor reversely adjusts the attenuation value of the proximal downlink attenuator to ensure the power stability of the downlink laser U1A driving signal. The ALC control circuit ensures the channel's driving level for the downlink laser and enables the channel amplifier to operate in the optimal linear region.

[0085] At the same time, the uplink optical signal is separated into a 1550nm optical signal through the WDM combiner U1, and enters the U1B high-sensitivity near-end uplink optical detector to be converted into an electrical signal. The signal power is then increased by the near-end uplink low-noise amplifier U2. The signal is amplified again after passing through the near-end uplink attenuator U3, and finally filtered out of the out-of-band spurious signal by the near-end uplink filter U5 and output to the 5G base station 2.

[0086] The upstream OALC near-end upstream automatic gain control circuit adjusts the channel level according to the different received optical powers to maintain a stable level output. The optical voltage of the upstream optical signal is connected to the microprocessor, and the microprocessor reversely regulates the near-end upstream attenuator U3 to ensure that the received optical power has a large dynamic range.

[0087] The network management control module of the two-way channel is mainly composed of MCU and its monitoring software to monitor the working parameters and status of the laser U1A and photodetector U1B of the near-end device, and communicate upward to the external network management server. At the same time, the network management control module is also responsible for managing the remote device 7. The network management instructions sent down are modulated by the FSK modulator U14, such as the 433Mhz FSK channel, inserted into the downlink channel and broadcast to multiple remote devices 7, and the network management feedback data of the remote device 7 is received through the uplink FSK channel.

[0088] like Figure 3 and Figures 11 to 23 As shown, (it should be noted that Fig.14 The E in Fig.15 The connection at E in the figure forms a complete automatic optical power control circuit; Fig.16 The F in Fig.17 Connect at F in Fig.17 The H in Fig.18 Connect at H in Fig.17 The G in Fig.19 Connect at G in the circuit to form a complete circuit structure; Fig. 20 I in Fig.21 Connect at I in Fig. 20 The J in Fig. 22 Connect at J in Fig. 22 The K in Fig.23 K in the figure forms a complete circuit). In this embodiment, the remote device 7 includes a remote uplink channel, a remote downlink channel and a remote network management control module, and the remote network management control module is connected to the remote uplink channel and the remote downlink channel respectively;

[0089] The remote uplink channel is used to filter out stray signals and amplify the uplink mobile signal, and after the operation is completed, drive the laser to upload the uplink mobile signal to the optical network unit 8 by using the laser;

[0090] The remote network management control module is used to receive the signal instruction of the near-end device 3 and adjust the wavelength and the working state of the remote device 7 according to the signal instruction;

[0091] The remote downlink channel is used to convert the optical signal obtained from the downlink into an electrical signal, perform signal power enhancement processing on the electrical signal, and radiate the enhanced electrical signal to the specified location through the antenna.

[0092] In this embodiment, the remote uplink channel includes an uplink signal antenna, an uplink filter, an uplink low noise amplifier, an uplink controllable attenuator, an uplink RF amplifier, an automatic gain control circuit and an uplink laser; the uplink signal antenna is used to receive and transmit the uplink mobile signal to the uplink filter; the uplink filter is used to receive the uplink mobile signal and filter out the stray signal outside the uplink mobile signal channel; the uplink low noise amplifier is used to amplify the uplink mobile signal after filtering and transmit it to the uplink controllable attenuator; the uplink controllable attenuator is used to perform power signal adjustment operations on the uplink mobile signal; the uplink RF amplifier is used to amplify and enhance the uplink mobile signal; the automatic gain control circuit is used to reversely regulate the uplink controllable attenuator according to the power signal; the uplink laser is used to upload the uplink mobile signal to the optical network unit 8.

[0093] In this embodiment, the uplink laser is controlled by an automatic optical power control circuit and an automatic temperature control circuit;

[0094] The automatic optical power control circuit is composed of operational amplifier U17 and laser U1A, and the automatic optical power control is realized by regulating the bias current of the uplink laser through the voltage negative feedback of the backlight detection;

[0095] The automatic temperature control circuit is composed of a temperature control chip U29, an operational amplifier U27 and an operational amplifier U2. It detects the value of the thermistor inside the uplink laser and adjusts the semiconductor cooler inside the uplink laser according to the resistance value result to achieve internal temperature control of the uplink laser.

[0096] In this embodiment, the remote downlink channel includes an optical detector, a downlink low noise amplifier, an optical level control circuit, a downlink controllable attenuator, a downlink RF amplifier, a downlink filter and a downlink signal antenna; the optical detector is used to convert the obtained downlink optical signal into a downlink electrical signal and transmit the downlink electrical signal to the downlink low noise amplifier; the downlink low noise amplifier is used to receive the downlink optical signal and perform signal power enhancement processing on the optical signal; the optical level control circuit is used to regulate the stable output of the downlink signal antenna electrical signal power according to the attenuation value of the downlink controllable attenuator; the downlink controllable attenuator is used to perform power signal adjustment operations on the downlink mobile signal; the downlink RF amplifier is used to perform amplification and enhancement processing on the downlink mobile signal; the downlink filter is used to filter out stray signals outside the downlink mobile signal channel; the downlink signal antenna is used to output the downlink mobile signal to a designated location.

[0097] In this embodiment, the optically controlled level control circuit utilizes the microprocessor U25 to detect the signal power voltage of the digital detector, and simultaneously receives the voltage signal of the optical power device, and reversely regulates the attenuation value of the downlink controllable attenuator according to the detection and reception results, so as to realize the stable output of the downlink signal antenna power.

[0098] like Figure 3 and Figures 11 to 23 As shown, the working principle of the remote device 7 is described:

[0099] The downstream optical signal is separated into a 1610nm optical signal by the WDM combiner U1 of the remote device 7, and then enters the U1B high-sensitivity 1610nm optical detector to be converted into an electrical signal. The signal power is then increased by the downstream low-noise amplifier U3, and the signal is amplified again after passing through the downstream controllable attenuator U4 and the downstream low-noise amplifier U5. Optionally, if a higher output power is required, a downstream filter U6 can be added to further filter out the out-of-band interference between channels, and the signal is amplified again to 15-23dbm through the downstream RF amplifier U7. Finally, the out-of-band spurious signal is filtered out by the downstream filter U8 and output to the antenna for radiation.

[0100] Downlink O / ALC control: The microprocessor U25 simultaneously detects the signal power voltage of the logarithmic detector U9 and the voltage signal of the receiving optical power device U2. The microprocessor reversely adjusts the attenuation value of the downlink controllable attenuator U4 to adjust the antenna signal power stable output.

[0101] The uplink mobile signal is filtered out of the stray signals outside the channel by filter U10, amplified by low noise amplifier U11, and enters attenuator U12. After the attenuator adjusts the signal to an appropriate power, it passes through high gain RF amplifier U13 and filter U14, with a power signal of 0 to 5 dBm. Optionally, if a higher laser driving power is required, power amplifier U15 and filter U16 can be added to drive laser U1A. The laser emits a 1550nm wavelength optical signal, which is transmitted uplink to the optical network unit 8 through WDM combiner U1.

[0102] The normal operation of the uplink laser is ensured by the automatic optical power control circuit APC and the automatic temperature control circuit ATC. The APC circuit is composed of an operational amplifier U17 and a laser U1A, and is implemented by regulating the bias current of the laser through the negative feedback of the voltage detected by the backlight. The ATC circuit is implemented by a special temperature control chip U29 and operational amplifiers U27 and U28. It detects the value of the thermistor inside the laser and negatively feedback controls the semiconductor cooler U1C inside the laser to ensure that the internal temperature of the laser reaches a certain temperature, such as 25°C.

[0103] The wavelength of the uplink laser 1550 can be fine-tuned within a 3nm range by changing the laser temperature. The microcontroller U25 makes the wavelengths of each remote laser different under the near-end management through the U28 and U29 tuning circuits, thereby optimizing the OBI problem of multi-path optical signals in the uplink channel.

[0104] One near-end device 3 can be connected to up to 64 remote devices 7. If the uplink lasers of all 64 remote devices 7 are turned on, a large optical noise floor signal will be gathered. In order to solve or reduce the noise aggregation problem, the remote device 7 is designed with a light trigger control circuit. The laser will only be turned on when the uplink electrical signal arrives, thereby reducing the converged optical noise of multiple remote lasers.

[0105] Specifically, the light-emitting trigger control circuit needs to meet a specific delay protocol to ensure normal communication of 5G signals. Generally, the trigger delay is <1.3uS when turned on and the delay is <1.7uS when turned off.

[0106] The uplink electrical signal is used to obtain a trigger voltage signal by the detector U18. The trigger upper and lower thresholds are given by U19. The upper and lower threshold ranges are generally set to 15dB. The trigger voltage signal and the threshold comparator U20 obtain a trigger logic signal, which is then passed through the gate circuit U21 and the voltage converter U22 to obtain the control voltage of the laser. Finally, the current driver U17 provides a bias current to the laser U1A. The opening and closing of the laser is thus determined by the presence or absence of the uplink mobile signal.

[0107] The remote network management control module is executed by the microprocessor U25, which receives FSK signal instructions from the near-end device and is responsible for adjusting the laser wavelength tuning function, light trigger threshold configuration and remote device working status collection, and feeds back the network management data to the near-end network management host control system through the FSK signal.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A 5G antenna signal FTTR optical fiber distributed network transmission system, characterized in that: The optical fiber distributed network transmission system includes a network management device, a 5G base station, a near-end device, a first-wave multiplexer, an optical line terminal, a second-wave multiplexer, a remote device and an optical network unit; The network management device is connected to the near-end device and the far-end device respectively, the 5G base station is connected to the near-end device, the near-end device is connected to the first wave multiplexer, the first wave multiplexer is connected to the optical line terminal, the first wave multiplexer is connected to the second wave multiplexer, and the second wave multiplexer is connected to the far-end device and the optical network unit respectively; The network management device is used to monitor the operating parameters of the near-end device and the remote device, and perform network parameter configuration operations based on the operating parameters; The 5G base station is used to obtain and output a downlink radio frequency signal; The proximal device is used to perform gain adjustment on the downlink radio frequency signal output by the 5G base station to complete the electro-optical conversion operation and obtain a 5G optical signal; The first wave multiplexer is used to combine the 5G optical signal into the optical line terminal; The optical line terminal is used to transmit the 5G optical signal to the optical network unit; The second wave multiplexer is used to separate the 5G optical signal; The remote device is used to perform an amplification operation after performing photoelectric conversion on the 5G optical signal, and output the operation result by antenna radiation; The optical network unit is used to receive the processed 5G optical signal.

2. According to claim 1, a 5G antenna signal FTTR optical fiber distributed network transmission system is characterized in that: The proximal device includes a proximal uplink channel, an uplink network management control module and a proximal downlink channel, and the uplink network management control module is connected to the proximal uplink channel and the proximal downlink channel respectively; The proximal uplink channel is used to convert the optical signal separated by the second wave multiplexer into an electrical signal, and output the electrical signal to the 5G base station after amplifying the conversion result. The uplink network management control module is used to monitor the working status and state of the proximal uplink channel and the proximal downlink channel, and upload the monitoring results to the network management device; The near-end downlink channel is used to adjust the signal power of the downlink signal and drive the laser to transmit the optical signal to the second wave multiplexer according to the adjustment result.

3. According to claim 2, a 5G antenna signal FTTR optical fiber distributed network transmission system is characterized in that: The proximal uplink channel includes a proximal uplink optical detector, a proximal uplink low noise amplifier, a proximal uplink automatic gain control circuit, a proximal uplink attenuator, a proximal uplink RF amplifier, a proximal uplink filter and a 5G uplink signal antenna; The proximal uplink optical detector is respectively connected to the proximal uplink automatic gain control circuit and the proximal uplink low noise amplifier, the proximal uplink low noise amplifier is connected to the proximal uplink attenuator, the proximal uplink attenuator is connected to the proximal uplink filter, and the proximal uplink filter is connected to the 5G uplink signal antenna; The near-end uplink optical detector is used to receive the optical signal separated by the second wave multiplexer and convert the optical signal to obtain an electrical signal; The proximal uplink low noise amplifier is used to receive the electrical signal generated by the proximal uplink optical detector and perform signal power enhancement processing on the electrical signal; The near-end uplink automatic gain control circuit is used to reversely regulate the near-end uplink attenuator according to the received optical power, and adjust the level state of the near-end uplink channel based on the regulation result; The proximal uplink attenuator is used to reduce the amplitude of the electrical signal and adjust the electrical signal to a preset power; The proximal uplink RF amplifier is used to amplify and enhance the electrical signal; The near-end uplink filter is used to filter out stray signals outside the band of the amplified electrical signal; The 5G uplink signal antenna is used to transmit the processed optical signal to the 5G base station.

4. The optical fiber distributed network transmission system of a 5G antenna signal FTTR according to claim 3 is characterized in that: The step of adjusting the signal power of the downlink signal and driving the laser to transmit the optical signal to the second wave multiplexer according to the adjustment result comprises: The 5G downlink signal is received by the 5G downlink signal antenna, and the 5G downlink signal is transmitted to the proximal downlink filter, and the spurious signals outside the 5G downlink signal channel are filtered out based on the proximal downlink filter; Feeding back the filtered 5G downlink signal to the near-end downlink attenuator, adjusting the power of the 5G downlink signal based on the near-end downlink attenuator, and inputting it to the near-end downlink RF amplifier after reaching the preset power; The near-end downlink RF amplifier drives the near-end downlink laser according to the adjustment result, and uses the near-end downlink laser to emit a wavelength optical signal, and transmits the 5G downlink signal to the designated location through the second wave multiplexer.

5. The optical fiber distributed network transmission system of a 5G antenna signal FTTR according to claim 1, characterized in that: The remote device includes a remote uplink channel, a remote downlink channel and a remote network management control module, and the remote network management control module is connected to the remote uplink channel and the remote downlink channel respectively; The remote uplink channel is used to perform stray signal filtering and amplification operations on the uplink mobile signal, and after the operations are completed, drives the laser to upload the uplink mobile signal to the optical network unit using the laser; The remote network management control module is used to receive the signal instruction of the near-end device and adjust the wavelength and the working state of the remote device according to the signal instruction; The remote downlink channel is used to convert the optical signal obtained in the downlink into an electrical signal, perform signal power enhancement processing on the electrical signal, and radiate the enhanced electrical signal to a designated position through an antenna.

6. The optical fiber distributed network transmission system of 5G antenna signal FTTR according to claim 5, characterized in that: The remote uplink channel includes an uplink signal antenna, an uplink filter, an uplink low noise amplifier, an uplink controllable attenuator, an uplink RF amplifier, an automatic gain control circuit and an uplink laser; The uplink signal antenna is connected to the uplink filter, the uplink filter is connected to the uplink low noise amplifier, the uplink low noise amplifier is connected to the uplink controllable attenuator, the uplink controllable attenuator is respectively connected to the uplink RF amplifier and the automatic gain control circuit, and the uplink RF amplifier is connected to the uplink laser; The uplink signal antenna is used to receive and transmit uplink mobile signals to the uplink filter; The uplink filter is used to receive the uplink mobile signal and filter out the stray signals outside the uplink mobile signal channel; The uplink low noise amplifier is used to amplify the uplink mobile signal after filtering and transmit it to the uplink controllable attenuator; The uplink controllable attenuator is used to perform a power signal adjustment operation on the uplink mobile signal; The uplink RF amplifier is used to amplify and enhance the uplink mobile signal; The automatic gain control circuit is used to reversely regulate the uplink controllable attenuator according to the power signal; The uplink laser is used to upload the uplink mobile signal to the optical network unit.

7. The optical fiber distributed network transmission system of 5G antenna signal FTTR according to claim 6, characterized in that: The uplink laser is controlled by an automatic optical power control circuit and an automatic temperature control circuit; The automatic optical power control circuit is composed of an operational amplifier U17 and a laser U1A, and realizes automatic control of the automatic optical power control by regulating the bias current of the uplink laser through the voltage negative feedback of the backlight detection; The automatic temperature control circuit is composed of a temperature control chip U29, an operational amplifier U27 and an operational amplifier U2. The internal temperature control of the uplink laser is achieved by detecting the temperature-sensitive resistor value inside the uplink laser and adjusting the semiconductor cooler inside the uplink laser according to the resistance value result.

8. The optical fiber distributed network transmission system of 5G antenna signal FTTR according to claim 7, characterized in that: The wavelength of the uplink laser is adjusted by the automatic temperature control circuit, and the adjustment range is ±3nm.

9. The optical fiber distributed network transmission system of 5G antenna signal FTTR according to claim 8, characterized in that: The remote downlink channel includes a photodetector, a downlink low noise amplifier, an optical level control circuit, a downlink controllable attenuator, a downlink RF amplifier, a downlink filter and a downlink signal antenna; The optical detector is connected to the downlink low noise amplifier and the optical level control circuit respectively, the downlink low noise amplifier and the optical level control circuit are both connected to the downlink controllable attenuator, the downlink controllable attenuator is connected to the downlink RF amplifier, the downlink RF amplifier is connected to the downlink filter, and the downlink filter is connected to the downlink signal antenna; The optical detector is used to convert the obtained downlink optical signal into a downlink electrical signal, and transmit the downlink electrical signal to the downlink low noise amplifier; The downlink low noise amplifier is used to receive the downlink optical signal and perform signal power enhancement processing on the optical signal; The optically controlled level control circuit is used to regulate the stable output of the electrical signal power of the downlink signal antenna according to the attenuation value of the downlink controllable attenuator; The downlink controllable attenuator is used to perform a power signal adjustment operation on the downlink mobile signal; The downlink RF amplifier is used to amplify and enhance the downlink mobile signal; The downlink filter is used to filter out spurious signals outside the downlink mobile signal channel; The downlink signal antenna is used to output the downlink mobile signal to a designated location.

10. The optical fiber distributed network transmission system of 5G antenna signal FTTR according to claim 9, characterized in that: The optical level control circuit uses the microprocessor U25 to detect the signal power voltage of the digital detector, and receives the voltage signal of the optical power device at the same time, and reversely regulates the attenuation value of the downlink controllable attenuator according to the detection and reception results to achieve stable output of the downlink signal antenna power.

Images