TW202347977A - A flexible bidirectional fiber-fso-5g wireless convergent system - Google Patents

Abstract

A flexible bidirectional fiber-free-space optical (FSO)-fifth-generation (5G) wireless convergent system with 1-Gb/s/4.5-GHz sub-6 GHz and 10-Gb/s/28-GHz millimeter-wave (MMW) (downstream), as well as 10-Gb/s/24-GHz MMW (upstream) 5G hybrid data signals is built, employing a vertical cavity surface emitting laser (VCSEL)-based wavelength selector and a remotely injection-locked distributed feedback laser diode (DFB LD) for presentation. It is the first to adopt a VCSEL-based wavelength selector to adaptively provide 5G applications and an injection-locked DFB LD to perform a phase modulation-to-intensity modulation transformation with an optical-to-electrical conversion. Good bit error rate performance and acceptable eye diagrams are achieved over 25 km single-mode fiber transport, 600 m FSO link, and 10 m/4 m RF wireless transmission. Such demonstrated fiber-FSO-5G wireless convergent system is a promising one toward optical-based long-haul networks at comparatively high-speed operations. It exhibits an excellent convergence not only due to its development for incorporating optical fiber with optical/5G wireless networks, but also due to its enhancement for flexible two-way high-speed and long-haul communications.

Description

Flexible/two-way fifth-generation mobile communications/fiber optic broadband/wireless optical communications integrated access system

The invention is a "flexible/two-way fifth-generation mobile communication/fiber-optic broadband/wireless optical communication integrated access system", an integrated access network system that combines fiber-optic broadband network, wireless optical communication FSO, and fifth-generation mobile communication (5G) No matter it has a huge niche for the four major networks of telecommunications, cable TV, OTT and all smart Internet of Things, the impact and impact it will bring can be expected to be quite huge; therefore, for optical fiber broadband networks, It is necessary to conduct in-depth discussion and research on the heterogeneous integrated network access system of wireless optical communication FSO and fifth-generation mobile communication. More importantly, its transmission signal quality must be optimized to obtain fifth-generation mobile communication with good transmission signal quality. Optical fiber broadband/wireless optical communication heterogeneous integrated network access system. The invention plans and constructs a combination of optical fiber broadband network, wireless optical communication FSO and 5G high-speed mobile communication to transmit 5G Sub-6GHz and 5G MMW mixed signals on the broadband heterogeneous integrated access network, making full use of optical fiber access network, wireless optical Communication FSO and 5G mobile communication have the advantages of "broadband", "ultra-long distance transmission" and "high mobility". Based on the high bandwidth/low transmission loss characteristics of optical fiber, the high transmission capacity/free-space low transmission loss characteristics of wireless optical communication FSO, and the high mobility characteristics of 5G mobile communication, it integrates heterogeneous optical fiber broadband networks, wireless optical communication FSO and fifth-generation mobile communications , constructing a fiber optic broadband/wireless optical communication FSO/5G Sub-6GHz/5G MMW integrated access system with good transmission signal quality; and finally constructing a fifth-generation mobile communication fiber optic broadband/wireless optical communication heterogeneous integrated access network system to accelerate Realize the vision of integrated path access for high-speed, high-bandwidth heterogeneous networks of the fifth generation of mobile communications in the optical generation.

In recent years, as the development of optical communication technology has become increasingly mature, the application of optical communication in various fields has become the focus of various researchers. Because of the excellent characteristics of optical (fiber) communication and wireless optical communication FSO, such as: high bandwidth, low It has the advantages of loss, electrical insulation and no electromagnetic interference, and at the same time has a high transmission rate, so that the overall system can have a better data transmission rate and improve the signal transmission quality.

In terms of optical fiber communications, new types of transmission systems, such as active optical cables, are currently used to replace traditional cables in cloud servers in data centers. Relying on the high capacity and low loss of optical fiber, the use of active optical cables inside optical transmitters can provide cloud communications with data transmission rates of 10Gbps or higher. With the gradual use of active optical cables in data centers, the amount of data transmission has increased. Significant improvement and extended transmission distance.

Wireless optical communications currently have good optical properties and are easy to set up, and overcome many limitations of radio frequency wireless communications, such as data volume transmission limitations and free space distance transmission limitations. In practical applications, high-speed data transmission is the primary design consideration for wireless optical communications. Recently, the communication needs of long-distance, fast and high data transmission rate wireless optical communications FSO have been gradually paid attention to.

In view of the prior art, the purpose of the present invention is to construct a "flexible/two-way fifth generation mobile communication/fiber broadband/wireless optical communication integrated access system by combining fifth generation mobile communication, optical fiber broadband network, and wireless optical communication FSO" ”.

This invention's "flexible/two-way fifth-generation mobile communication/fiber broadband/wireless optical communication integrated access system" uses phase modulators and DFB laser diodes to construct two-way wireless optical communication FSO transmission system, downlink signal transmission uses a phase modulator to modulate and transmit 1-Gb/s/4.5-GHz 5G sub-6GHz 16-QAM-OFDM/10-Gb/s/28-GHz 5G MMW signals, and After transmitting through 600m free-space, the receiving end DFB laser diode is remotely injected to achieve the phase modulation to intensity modulation (PM-to-IM) function; while the uplink signal transmission uses the receiving end DFB Laser diodes directly modulate and transmit 10-Gb/s 16-QAM-OFDM signals, which are uploaded via 60m free-space. For downlink signal transmission, the DFB laser diode at the receiving end has both phase modulation and intensity modulation and optical/electrical conversion (O/E) mechanisms; while for uplink signal transmission, the DFB laser diode is Signal light source. Using DFB laser diodes to replace the phase modulation to intensity modulation mechanism and photodetector (PD) function greatly reduces the cost and complexity of system construction. We use the following three mechanisms to complete it.

4.5-GHz 5G Sub-6GHz/5G 24-GHz/28-GHz MMW signal generation mechanism, using Dual-Arm MZM to carry 1-Gb/s/4.5-GHz and 10-Gb/s/28-GHz 5G MMW signals , appropriately control the input 1-Gb/s/4.5-GHz and 10-Gb/s/28-GHz 5G MMW signal strengths so that the Dual-Arm MZM output optical signal can generate ±1-order carrier output (1-Gb /s/4.5-GHz) and (10-Gb/s/28-GHz) (Figure 2(a)). For an optical signal modulation system, its electric field strength E(t) can be expressed as:

其中M：OMI、f _m ：訊號調變頻率、β：FMI、

：相位延遲。當M(OMI)越大時(5G MMW訊號強度越大時)，光訊號輸出波載波數(階數)越多、側模振幅越大；反之，當M(OMI)越小時(5G MMW訊號強度越小時)，光訊號輸出波載波數(階數)越少、側模振幅越小。為了得到適當的載波數(階數)輸出，Dual-Arm MZM的兩側OMI值必須適當的控制在一定的大小；若要得 到多載波(階數)輸出，就需要做深度調變(large OMI)；反之若不需多載波(階數)輸出，只需要做淺度調變(small OMI)即可。當彈性/動態5G Sub-6GHz/5G MMW選取機制選取中心載波及4.5GHz一階載波時，系統衍生出5G 4.5-GHz 5G Sub-6GHz訊號(圖3(b))；當彈性/動態5G Sub-6GHz/5G MMW選取機制選取中心載波及28GHz一階載波時，系統衍生出5G 28-GHz MMW訊號(圖3(c))；而當彈性/動態5G Sub-6GHz/5G MMW選取機制只選取中心載波時，系統衍生出中心載波提供做為上行傳輸光訊號源(圖3(d))。

Among them, M : OMI, f _m : signal modulation frequency, β : FMI,

: Phase delay. When M (OMI) is larger (5G MMW signal strength is greater), the optical signal output wave carrier number (order) is more and the side mode amplitude is larger; conversely, when M (OMI) is smaller (5G MMW signal The smaller the intensity), the fewer the optical signal output wave carrier number (order) and the smaller the side mode amplitude. In order to obtain an appropriate carrier number (order) output, the OMI values on both sides of the Dual-Arm MZM must be appropriately controlled to a certain size; if you want to obtain a multi-carrier (order) output, you need to perform deep modulation (large OMI ); On the contrary, if multi-carrier (order) output is not required, only shallow modulation (small OMI) is required. When the flexible/dynamic 5G Sub-6GHz/5G MMW selection mechanism selects the center carrier and the 4.5GHz first-order carrier, the system derives a 5G 4.5-GHz 5G Sub-6GHz signal (Figure 3(b)); when the flexible/dynamic 5G Sub When the -6GHz/5G MMW selection mechanism selects the center carrier and the 28GHz first-order carrier, the system derives a 5G 28-GHz MMW signal (Figure 3(c)); while when the flexible/dynamic 5G Sub-6GHz/5G MMW selection mechanism only selects When the center carrier is used, the system derives the center carrier to serve as the uplink transmission optical signal source (Figure 3(d)).

Using VCSEL to construct a flexible/dynamic 5G Sub-6GHz/5G MMW selection mechanism, we conceive of using VCSEL main mode wavelengths to match different orders of optical carriers, but this requires VCSELs with different main mode wavelengths to complete. However, this Multiple VCSELs will be required, which will also increase the construction cost and complexity of the system. We propose that by adjusting the driving current of the VCSEL, we can effectively move the wavelength of the main mode of the VCSEL, so that it can flexibly and dynamically match the corresponding optical carriers of different orders, and this can also reduce the construction cost and complexity of the system. Spend. The flexible/dynamic 5G Sub-6GHz/5G MMW selection mechanism (VCSEL-based 5G Sub-6GHz/5G MMW Selector) constructed using VCSEL has its architecture and operational functions as shown in Figure 5. In order to provide and select 5G Sub-6GHz/5G MMW downlink optical signals and uplink optical carriers at the same time, a 5G Sub-6GHz/5G MMW selection mechanism constructed by two parallel VCSELs is used, one of which is used to select 5G Sub-6GHz /5G MMW downlink optical signal, and the other is used to provide uplink optical carrier. The 4.5-GHz/28-GHz MMW optical signal modulated by Dual-Arm MZM is injected into the VCSEL through the optical circulator (OC). If a certain order optical carrier of the Dual-Arm MZM modulated optical signal is connected to the VCSEL If the modes match each other, the optical carrier of this order will produce Due to the external light source injection effect, the optical signal intensity will be enhanced and amplified, while other orders of optical carriers will be effectively suppressed, so that the center carrier, 4.5-GHz 5G Sub-6GHz or 5G 28 can be flexibly/dynamically selected. -GHz MMW.

OCSR (Optical Carrier-to-Sideband Ratio) optimization, the uplink transmission uses a phase modulator to carry the 5G 24-GHz MMW optical signal, and uses remote injection mode locking technology to inject this phase modulated optical signal into the receiving end DFB thunder After emitting the diode, the phase modulation to intensity modulation and photoelectric conversion effects are generated, so that the phase modulation optical signal is converted into an intensity modulation optical signal, and is received and converted into an electrical signal; DFB LD uses remote injection mode locking technology Used to replace the functions of traditional PM-to-IM converters and PDs. When the remote injection mode-locking effect occurs, the DFB laser diode not only has the original function of transmitting optical signals, but also has the function of receiving optical signals. It can not only convert electrical signals into uplink optical signals, but also receive and demodulate downlink signals. light signal. When the phase modulated optical signal (Figure 4(a)) is converted into an intensity modulated optical signal, the level of the first order (+1 order or -1 order) optical carrier will be promoted and amplified, while the level of the other order (-1 order) will be 1st order or +1st order) optical carrier level will be suppressed. When the optical carrier level is raised and amplified to the same size as the center carrier level (OCSR=0dB) (Figure 4(b)), the uplink signal transmission system will obtain the best transmission signal quality, that is, the lowest BER and EVM, and the clearest eye diagram. Therefore, in order to have the best transmission signal quality for uplink transmission, we must optimize the OCSR value derived when phase modulation is converted to intensity modulation, that is, the optical power value and wavelength value of the injected optical signal must be appropriately adjusted (optimum injection) , to obtain the best OCSR value and the best uplink transmission signal quality.

201(a),201(b): Distributed feedback laser diode

202(a), 202(b), 202(c): Polarization controller

203(a): Two-arm Mach-Zehnder intensity modulator

204(a),204(b),204(c): Modulator driver

205(a),205(b): Erbium-doped fiber amplifier

206(a),206(b): Adjustable light attenuator

207(a),207(b),207(c): Optical circulator

208(a),208(b):Double lens

209: Vertical resonant cavity surface emitting laser

210(a), 210(b), 210(c): Radio frequency power amplifier

211(a),211(b):K-Band horn antenna

212(a),212(b),212(c): Envelope detector

213(a),213(b),213(c): Low noise driver

214(a), 214(b): Digital storage oscilloscope

215(a),215(b): Bit error rate analyzer

216(a),216(b):4.5GHz base station antenna

217(a),217(b):Ka-Band horn antenna

218(a),218(b): Photodetector

219:Phase modulator

Figure 1: Fifth generation/mobile communication optical fiber broadband/wireless optical communication integration (Fiber-FSO-5G/6G Convergence) access system.

Figure 2: Flexible/dynamic two-way optical fiber broadband/wireless optical communication FSO/5G MMW/6G Sub-THz integrated system.

Figure 3: (a) Spectrum before passing through the VCSEL wavelength selector.

(b) Using mode-locked injection technology to increase the strength of the lower sideband (1-Gb/s/4.5-GHz 5G sub-6GHz data signal).

(c) Using mode-locked injection technology to increase the strength of the lower sideband (10-Gb/s/28-GHz 5G MMW data signal).

(d) The intensity of the central carrier is enhanced using mode-locked injection technology.

Figure 4: (a) Spectrum before injection using mode locking.

(b) The strength of the upper sideband is enhanced using mold-locked injection.

Figure 5: (a) Spectrum before mode-locked injection.

(b) The strength of the upper sideband is enhanced using mold-locked injection technology.

Figure 6: (a) Bit error rate performance of 1-Gb/s/4.5-GHz 5G sub-6GHz data signals in different scenarios.

(b) Eye diagram of transmission via 25km SMF.

(c) Eye diagram through 25km SMF, 600m FSO link and 10m RF wireless transmission.

Figure 7: (a) Bit error rate performance of 10-Gb/s/28-GHz 5G MMW data signals in different scenarios.

(b) Eye diagram of transmission via 25km SMF.

(c) Eye diagram through 25km SMF, 600m FSO link and 4m RF wireless transmission.

Figure 8: Uplink 10-Gb/s/24-GHz 5G MMW data signal in

(a) Eye diagram under 022nm wavelength detuning and 3dBm injection conditions.

(b) Eye diagram under 0.22nm wavelength detuning and -3dBm injection conditions.

(c) 0.42nm wavelength detuning.

Figure 9: (a) 40-Gb/s/50-GHz (5G MMW downlink)

(b)40-Gb/s/100-GHz (6G Sub-THz downlink)

(c)40-Gb/s/200-GHz (6G Sub-THz downlink)

(d) 10-Gb/s/24-GHz (5G MMW uplink) 16-QAM-OFDM constellation diagram and its corresponding bit error rate value.

"Flexible/two-way fifth-generation mobile communication/fiber-optic broadband/wireless optical communication integrated access system", its system architecture is shown in Figure 2. Figure 2 shows our "flexible/two-way fifth-generation mobile communication/fiber-optic broadband/ "Wireless Optical Communications Integrated Access System" configuration, which has 203(a) and can provide 1-Gb/s/4.5-GHz sub-6GHz and 10-Gb/s/28-GHz 5G MMW with downlink intensity modulation Mixed data signals, and phase modulators for transmitting uplink phase re-modulated 10-Gb/s/24-GHz 5G MMW data signals. After using 202(a) for polarization, 201(a) with a center wavelength of 1540.62nm (λ1) applies an optical carrier on 203(a). A 1-Gb/s non-return-to-zero (NRZ) data stream is mixed with a 4.5-GHz MW carrier to create a 1-Gb/s/4.5-GHz 5G sub-6GHz data signal. After passing through 204(a), this 1-Gb/s/4.5-GHz 5G sub-6GHz data signal drives one arm of 203(a). In addition, the 10-Gb/s NRZ data stream is mixed with the 28-GHz MMW carrier to generate a 10-Gb/s/28-GHz 5G MMW data signal. After passing through 204(b), this 10-Gb/s/28-GHz MMW data signal drives the other arm of 203(a). Here we are modulating An optical modulator mixes the data and electrical carrier waves beforehand. Given that appropriate 5G sub-6GHz and MMW mixed data signals are provided in 203(a), only first-order sidebands are generated with wavelength separations of 4.5GHz (0.036nm) and 28GHz (0.224nm). After polarization using 202(b), 1-Gb/s/4.5-GHz sub-6GHz and 10-Gb/s/28-GHz MMW mixed data signals are enhanced by 205(a) and optimized by 206(a) The optical power provided in the fiber optic link for optimal transmission performance is cycled by 207(a) and communicated over a 25 km SMF link. After that, the optical signal is transmitted through the 600m FSO link using 208(a)208(b). Using multiple plane mirrors on both sides, the FSO distance of the laser is increased to 600m (50m×12). Through the 25.6km (25km SMF+600m FSO) optical wired-wireless link, the optical signal is circulated by 207(b) and then provided to the VCSEL-based wavelength selector to adaptively select one of the optical signals. This VCSEL-based wavelength selector consists of 207(c), 202(c) and 209. Since the wavelength shift of VCSEL with temperature changes is 0.02nm/°C, a temperature controller is used in the VCSEL-based wavelength selector to overcome the wavelength shift problem caused by temperature changes. For the upstream path, the wavelength selector adaptively selects 1-Gb/s/4.5-GHz 5G sub-6GHz data signals. Figure 3(a) shows the spectrum before passing through the wavelength selector. The mode-locked injection increases the intensity of the lower sideband and produces the spectrum shown in Figure 3(b). The 1-Gb/s/4.5-GHz sub-6GHz data signal is next detected by a 5-GHz 218(a), amplified by a 210(b) with a frequency range of 4.4-5.0GHz, and passed through a set of 216(a) 216(b) for wireless transmission. After the 10m RF wireless link, the 1-Gb/s/4.5-GHz sub-6GHz data signal is detected by the 212(b) with a frequency range of 0.5-43.5GHz and by the 213(b) with a DC-40GHz frequency range drive. After driving, apply the 1-Gb/s NRZ data stream to 215(a) to measure the BER value. In addition, a digital storage oscilloscope 214(b) was deployed to capture the eye diagram of the 1Gb/s NRZ data flow. For the intermediate path, the wavelength selector adaptively selects the 10-Gb/s/28-GHz 5G MMW data signal. Mold clamping injection This increases the intensity of the lower sideband and produces the spectrum shown in Figure 3(c). The 10-Gb/s/28-GHz MMW data signal is then received by the 30-GHz 218(b), amplified by the 210(c) with a frequency range of 27-31GHz, and passed through a pair of 217(a) 217(b) ) for wireless transmission. After 4m RF wireless transmission, the 10Gb/s/28GHz MMW data signal is detected by 212(c) and driven by 213(c). Afterwards, the 10-Gb/s NRZ data stream is sent to 215(b) for BER performance analysis. In addition, 214(b) is used to capture the eye diagram of the 10Gb/s NRZ data stream. For the lower path, the wavelength selector adaptively selects a center carrier. The mode-locked injection enhances the intensity of the central carrier and produces the spectrum shown in Figure 3(d). The enhanced center carrier is then reused and re-modulated by the phase modulator for uplink modulation.

For uplink modulation, the 10-Gb/s/24-GHz 5G MMW data signal passes through 204(c) and is then provided to 219. The uplink optical signal is enhanced by 205(b), optimized by 206(b), recycled by 207(b), and communicated through 600m FSO transmission and 25km SMF transmission. Next, the uplink optical signal is circulated from 207(a) and injected into 201(b) (λc=1540.40nm) for PM to IM conversion and O/E conversion. The spectrum before remote mode-locked injection is shown in Figure 4(a). Remote mode-locked injection increases the intensity of the upper sideband and produces the spectrum expected in Figure 4(b). The 10-Gb/s/24-GHz 5G MMW data signal is then amplified by 210(a) with a frequency range of 17-24GHz and coupled by a pair of 211(a)211(b). Over the 4m RF wireless link, the data signal is detected by the 212(a) envelope and enhanced by the 213(a). Finally, the eye diagram of the 10Gb/s NRZ data stream is measured by 214(a).

201(a),201(b): Distributed feedback laser diode

202(a), 202(b), 202(c): Polarization controller

203(a): Two-arm Mach-Zehnder intensity modulator

204(a),204(b),204(c): Modulator driver

205(a),205(b): Erbium-doped fiber amplifier

206(a),206(b): Adjustable light attenuator

207(a),207(b),207(c): Optical circulator

208(a),208(b):Double lens

209: Vertical resonant cavity surface emitting laser

210(a), 210(b), 210(c): Radio frequency power amplifier

211(a),211(b):K-Band horn antenna

212(a),212(b),212(c): Envelope detector

213(a),213(b),213(c): Low noise driver

214(a), 214(b): Digital storage oscilloscope

215(a),215(b): Bit error rate analyzer

216(a),216(b):4.5GHz base station antenna

217(a),217(b):Ka-Band horn antenna

218(a),218(b): Photodetector

219:Phase modulator

Claims (9)

A flexible/two-way fifth generation mobile communication/fiber broadband/wireless optical communication integrated access system, including: A downlink transmission system that can provide downlink intensity modulated 1-Gb/s/4.5-GHz sub-6GHz and 10-Gb/s/28-GHz 5G MMW mixed data signals; and An uplink transmission system can provide a phase modulator for transmitting uplink phase re-modulation of 10-Gb/s/24-GHz 5G MMW data signals. As described in claim 1 of the patent application, the flexible/two-way fifth-generation mobile communication/fiber broadband/wireless optical communication integrated access system, wherein the downlink transmission system includes: a downlink launch system; and Downstream receiving system. The downlink transmission system as described in claim 2 of the patent application, wherein the downlink transmission system includes: a distributed feedback laser diode; and a first polarization controller coupled to the first distributed feedback laser diode for adjusting the polarization direction of the data light wave; and A pair of dual-arm Mach-Zehnder intensity modulators coupled to the first polarization controller and two modulator drivers to convert 1-Gb/s/4.5-GHz 5G sub-6GHz data signals to 10-Gb /s/28-GHz 5G MMW data signal, which mixes data and electrical carriers; and a second polarization controller coupled to the dual-arm Mach-Zehnder intensity modulator for adjusting the polarization direction of the data light wave; and a first erbium-doped fiber amplifier coupled to the second polarization controller for enhancing optical power; and a first adjustable optical attenuator, coupled to the first erbium-doped fiber amplifier, for optimizing the optical power provided in the optical fiber link to obtain the best transmission performance; and a first optical circulator, coupled to the first adjustable optical attenuator, for guiding the optical transmission direction of the data light wave and the first preset light wave; and A 25km single-mode optical fiber, coupled to the first optical circulator; and A 600m wireless optical communication link coupled to 25km single-mode optical fiber; and a second optical circulator, coupled to 600m wireless optical communication, for guiding the optical transmission direction of the data light wave and the first preset light wave; and A VCSEL wavelength selector is coupled to the second optical circulator to adaptively select one of the optical signals to enter any downstream receiving system. The downlink transmission system as described in claim 2 of the patent application, wherein the downlink receiving system includes: a 1-Gb/s/4.5-GHz sub-6GHz receiving system; and A 10-Gb/s/28-GHz 5G MMW receiving system. The downlink receiving system as described in claim 4 of the patent application, wherein the 1-Gb/s/4.5-GHz sub-6GHz receiving system includes: A 5GHz photodetector, coupled to the downlink transmitting system for photoelectric conversion; and a second radio frequency power amplifier coupled to the 5GHz photodetector for power amplification; and A 4.5GHz base station antenna coupled to the second radio frequency power amplifier for 10m radio frequency wireless transmission; and a second envelope detector coupled to the 4.5GHz base station antenna; and a second low-noise driver coupled to the second envelope detector; and a bit error rate analyzer coupled to the second low-noise driver for measuring the BER value; and A digital storage oscilloscope is coupled to the second low-noise driver to view the signal eye diagram. The downlink receiving system as described in claim 4 of the patent application, wherein the 10-Gb/s/28-GHz 5G MMW receiving system includes: A 30GHz photodetector, coupled to the downlink emission system for photoelectric conversion; and a third radio frequency power amplifier, coupled to the 30GHz photodetector, for power amplification; and A Ka-Band horn antenna, coupled to a third radio frequency power amplifier, used for 4m radio frequency wireless transmission; and a third envelope detector coupled to the Ka-Band horn antenna; and a third low-noise driver coupled to the third envelope detector; and a bit error rate analyzer, coupled to the third low-noise driver, for measuring the BER value; and A digital storage oscilloscope is coupled to the third low-noise driver to view the signal eye diagram. As described in claim 1 of the patent application, the flexible/two-way fifth-generation mobile communication/fiber broadband/wireless optical communication integrated access system, wherein the uplink transmission system includes: an uplink transmitting system; and An upstream receiving system The uplink transmission system as described in claim 7 of the patent application, wherein the uplink transmission system includes: a phase modulator coupled to the modulator driver for mixing the 10-Gb/s/24-GHz 5G MMW data signal with data and electrical carriers; and a second erbium-doped fiber amplifier coupled to the phase modulator for enhancing optical power; and a second adjustable optical attenuator coupled to the second erbium-doped fiber amplifier to optimize the optical power provided in the optical fiber link to obtain the best transmission performance; and a second optical circulator, coupled to the second adjustable optical attenuator, for guiding the optical transmission direction of the data light wave and the third preset light wave; and A 600m wireless optical communication link coupled to the second optical circulator; and A 25km single-mode optical fiber, coupled to a 600m wireless optical communication link; and A first optical circulator, coupled to the 25km single-mode optical fiber, is used to guide the optical transmission direction of the data light wave and the second preset light wave. The uplink transmission system as described in claim 7 of the patent application, wherein the uplink receiving system includes: a second distributed feedback laser diode, coupled to the uplink emission system, for conversion from phase modulation to intensity modulation and photoelectric conversion; and a first radio frequency power amplifier coupled to the second distributed feedback laser diode for power amplification; and A K-Band horn antenna, coupled to the first radio frequency power amplifier, used for 4m radio frequency wireless transmission; and a first envelope detector coupled to the K-Band horn antenna; and a first low-noise driver coupled to the first envelope detector; and A digital storage oscilloscope is coupled to the second low-noise driver to view the signal eye diagram.

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