CN111884723A - Photoelectric radio frequency feeder line component applied to uplink communication link - Google Patents
Photoelectric radio frequency feeder line component applied to uplink communication link Download PDFInfo
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- H—ELECTRICITY
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- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
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Abstract
The invention discloses a photoelectric radio frequency feeder line component applied to an uplink communication link, which consists of a front end component, a back end component and an optical cable. The front end component comprises a front end shielding box, and a front end power supply unit, a front end tubular wavelength division multiplexer and a front end photoelectric radio frequency processing unit which are arranged in the front end shielding box. The rear end component comprises a rear end shielding box, and a rear end power supply unit, a rear end photoelectric radio frequency processing unit and a rear end pipe type wavelength division multiplexer which are arranged in the rear end shielding box. The front end assembly and the back end assembly are connected by an optical cable. The invention designs a photoelectric radio frequency feeder line component which realizes the fiber replacement of a radio frequency feeder line by matching a miniaturized plug-and-play component with a photoelectric mixed radio frequency cable/optical cable.
Description
Technical Field
The invention relates to the technical field of radio frequency optical communication, in particular to a photoelectric radio frequency feeder line component applied to an uplink communication link.
Background
In the satellite signal uplink communication link of the satellite earth station, a radio frequency feeder is usually arranged between an up-conversion power amplifier (BUC) at the antenna end and a clock device and a modulation device at the tower base end, and the transmission of a reference clock (10MHz) and an intermediate frequency (L/S band) is completed, as shown in fig. 1. According to the field requirement, the arrangement length of the radio frequency feeder line is different from several meters to dozens of meters, in order to ensure low loss of high-frequency signals in the radio frequency feeder line, a large-diameter radio frequency feeder line with low insertion loss is generally selected, and the larger the diameter of the used radio frequency feeder line is, the longer the arrangement distance is, the corresponding weight of the radio frequency feeder line and the construction difficulty are also obviously improved.
With the development of optical transmission technology, the trend of optical fiber copper-in and copper-out is inevitable based on the characteristics of low loss, light weight, strong anti-interference capability and the like of optical fibers, military and civil radio frequency signal communication generally uses radio frequency optical transmission equipment for signal remote transmission, and antenna signals, radar signals, intermediate frequency signals and time frequency signals which need remote transmission in applications such as short wave/ultra-short wave antennas, mobile base stations, satellite ground stations and the like can all use the radio frequency optical transmission equipment for remote transmission. However, the radio frequency feeder line is used as a composite carrier of signals and energy, bears four signal and energy forms of a reference clock, an intermediate frequency, control and feed, is required to be arranged outdoors, and has extremely high requirements on volume size, reliability and environmental adaptability; the traditional radio frequency optical transmission equipment has the defects of large volume, inflexible arrangement, inconvenient use, lack of feed transmission capability and the like, but the traditional radio frequency optical transmission equipment hinders the fiber-making of a radio frequency feeder line.
Disclosure of Invention
The invention aims to solve the problem that the traditional radio frequency optical transmission equipment hinders the fibering of a radio frequency feeder due to the defects of large volume, inflexible arrangement, inconvenient use, lack of feeding transmission capability and the like, and provides a photoelectric radio frequency feeder component applied to an uplink communication link.
In order to solve the problems, the invention is realized by the following technical scheme:
the photoelectric radio frequency feeder line component applied to the uplink communication link is composed of a front end component, a back end component and an optical cable. The front end component comprises a front end shielding box, and a front end power supply unit, a front end tubular wavelength division multiplexer and a front end photoelectric radio frequency processing unit which are arranged in the front end shielding box; the front-end shielding box is provided with a front-end external power input interface, a front-end optical interface and a front-end mixed radio frequency interface; the external power supply input end of the front-end power supply unit is connected with the front-end external power supply input interface on the front-end shielding box, and the active power supply output end of the front-end power supply unit is connected with the active power supply input end of the front-end photoelectric radio frequency processing unit; the combined optical port of the front-end tube-type wavelength division multiplexer is connected with a front-end optical interface on the front-end shielding box, and the intermediate-frequency optical output end and the clock optical output end of the front-end tube-type wavelength division multiplexer are respectively connected with the intermediate-frequency optical input end and the clock optical input end of the front-end photoelectric radio-frequency processing unit; the mixed radio frequency output end of the front-end photoelectric radio frequency processing unit is connected with a front-end mixed radio frequency interface on the front-end shielding box. The rear end component comprises a rear end shielding box, and a rear end power supply unit, a rear end photoelectric radio frequency processing unit and a rear end pipe type wavelength division multiplexer which are arranged in the rear end shielding box; the rear-end shielding box is provided with a rear-end external power input interface, a rear-end mixed radio frequency interface and a rear-end optical interface; the external power supply input end of the rear-end power supply unit is connected with the rear-end external power supply input interface on the rear-end shielding box, and the active power supply output end of the rear-end power supply unit is connected with the active power supply input end of the rear-end photoelectric radio frequency processing unit; the mixed radio frequency input end of the rear-end photoelectric radio frequency processing unit is connected with a rear-end mixed radio frequency interface on the rear-end shielding box, and the intermediate frequency light output end and the clock light output end of the rear-end photoelectric radio frequency processing unit are respectively connected with the intermediate frequency light input end and the clock light input end of the rear-end tubular wavelength division multiplexer; and the combined optical port of the rear-end tube type wavelength division multiplexer is connected with a rear-end optical interface on the rear-end shielding box. The rear end optical interface on the rear end shielding box is connected with the front end optical interface on the front end shielding box through an optical cable.
In the above scheme, the front-end photoelectric radio frequency processing unit includes a front-end intermediate frequency coaxial detector, a front-end intermediate frequency low noise amplifier, a front-end high-pass filter, a front-end clock coaxial detector, a front-end clock AGC amplifier, a front-end low-pass filter, and a front-end combiner. The input end of the front-end intermediate frequency coaxial detector forms the intermediate frequency light input end of the front-end photoelectric radio frequency processing unit; the output end of the front-end intermediate frequency coaxial detector is connected with the input end of a front-end high-pass filter through a front-end intermediate frequency low-noise amplifier, and the output end of the front-end high-pass filter is connected with the intermediate frequency input end of a front-end combiner; the input end of the front-end clock coaxial detector forms a clock light input end of the front-end photoelectric radio frequency processing unit; the output end of the front-end clock coaxial detector is connected with the input end of a front-end low-pass filter through a front-end clock AGC amplifier, and the output end of the front-end low-pass filter is connected with the clock input end of a front-end combiner; the output end of the front-end combiner forms a mixed radio frequency output end of the front-end photoelectric radio frequency processing unit; the power supply ends of the front-end intermediate frequency coaxial detector, the front-end intermediate frequency low-noise amplifier, the front-end clock coaxial detector and the front-end clock AGC amplifier form an active power supply input end of the front-end photoelectric radio frequency processing unit.
In the above scheme, the back-end photoelectric radio frequency processing unit includes a back-end power divider, a back-end high-pass filter, a back-end intermediate frequency low-noise amplifier, a back-end intermediate frequency coaxial laser, a back-end intermediate frequency light control circuit, a back-end low-pass filter, a back-end clock low-noise amplifier, a back-end clock coaxial laser, and a back-end clock light control circuit. The input end of the rear-end power divider forms a mixed radio frequency input end of the rear-end photoelectric radio frequency processing unit; the output end of the rear-end intermediate-frequency coaxial laser forms the intermediate-frequency light output end of the rear-end photoelectric radio-frequency processing unit; the output end of the rear-end intermediate-frequency light control circuit is connected with the control end of the rear-end intermediate-frequency coaxial laser; the clock output end of the rear-end power divider is connected with the input end of a rear-end clock low-noise amplifier through a rear-end low-pass filter, the output end of the rear-end low-noise amplifier is connected with the input end of a rear-end clock coaxial laser, and the output end of the rear-end clock coaxial laser forms the clock output end of a rear-end photoelectric radio frequency processing unit; the output end of the back-end clock light-operated circuit is connected with the control end of the back-end clock coaxial laser; and power supply ends of the rear-end intermediate-frequency low-noise amplifier, the rear-end intermediate-frequency coaxial laser, the rear-end intermediate-frequency light control circuit, the rear-end clock low-noise amplifier, the rear-end clock coaxial laser and the rear-end clock light control circuit form an active power supply input end of the rear-end photoelectric radio frequency processing unit.
In the above scheme, the front-end power supply unit includes a front-end direct current filter and a front-end DC/DC power supply module. The input end of the front-end direct current filter forms the external power supply input end of the front-end power supply unit; the output end of the front-end direct current filter is connected with the input end of the front-end DC/DC power supply module; the output of the front-end DC/DC power supply module forms the active supply output of the front-end power supply unit.
In the above scheme, the back-end power supply unit includes a back-end direct current filter and a back-end DC/DC power supply module. The input end of the rear-end direct current filter forms the external power supply input end of the rear-end power supply unit; the output end of the rear-end direct current filter is connected with the input end of the rear-end DC/DC power supply module; and the output end of the back-end DC/DC power supply module forms an active power supply output end of the back-end power supply unit.
In the above scheme, the front-end shielding box and the rear-end shielding box are double-layer cavity shielding boxes. The front-end photoelectric radio frequency processing unit is positioned on the upper layer of the front-end shielding box, and the front-end tubular wavelength division multiplexer and the front-end power supply unit are positioned on the lower layer of the front-end shielding box. The rear-end photoelectric radio frequency processing unit is positioned on the upper layer of the rear-end shielding box, and the rear-end tubular wavelength division multiplexer and the rear-end power supply unit are positioned on the lower layer of the rear-end shielding box.
In the scheme, the front-end hybrid radio frequency interface and the rear-end hybrid radio frequency interface are both N-J type connectors; the front-end optical interface and the rear-end optical interface are both photoelectric aerospace sockets; the front-end external power supply input interface and the rear-end external power supply input interface are both SMA-K type or F-K type connectors.
Compared with the prior art, the invention has the following characteristics:
1. in-situ substitution can be realized: on the basis of not increasing or slightly increasing configuration and not changing the original system scheme, the original radio frequency feeder line interface is attacked, and the radio frequency feeder line of the antenna can be replaced in situ.
2. Can realize quick distribution: the novel radio frequency feeder has the advantages of being small in size and light in weight, upgrading the original thick, heavy and hard radio frequency feeder into a thin, light and soft single-core optical cable, greatly improving the laying efficiency and reducing the construction difficulty.
3. Can realize feeder lightning protection: on the basis that the antenna end assembly uses external feed, the electric isolation of the antenna end and the tower base end can be realized, and the damage of lightning induced by the long radio frequency feeder line to electronic equipment is effectively avoided.
4. The replacement of an intermediate frequency and clock optical transmitter and receiver can be realized: the remote optical transmission function of the intermediate frequency and the clock signal is integrated, when an external power supply is used, the clock equipment and the intermediate frequency transceiver equipment can be remotely placed in a central base room, so that the synchronization of the reference clocks of all the antennas is realized, and the clock and the intermediate frequency optical transmitter and receiver originally placed in a tower base are directly replaced.
5. Can realize quick maintenance: by adopting the separated design of the active part and the passive part and depending on the connection of the space photoelectric connector, the maintenance can be completed only by replacing the corresponding component part when a single component is damaged, and the whole feeder component does not need to be replaced.
Drawings
Fig. 1 is a schematic diagram of an application of a radio frequency feeder in an uplink communication link.
Fig. 2 is a schematic diagram of an internal structure of an optical electrical radio frequency feeder assembly applied to an uplink communication link.
Fig. 3 is a schematic diagram of an internal principle of an optical electrical radio frequency feeder assembly applied to an uplink communication link.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings in conjunction with specific examples. It should be noted that directional terms such as "upper", "lower", "middle", "left", "right", "front", "rear", and the like, referred to in the examples, refer only to the direction of the drawings. Accordingly, the directions used are for illustration only and are not intended to limit the scope of the present invention.
A photoelectric radio frequency feeder line component applied to an uplink communication link mainly comprises a back end component, a front end component and an optical cable. The rear end assembly is arranged at the tower base end or the central machine room, the front end assembly is arranged at the antenna end, and the rear end assembly is connected with the front end assembly through an optical cable. The photoelectric radio frequency feeder line component applied to the uplink communication link mainly completes transmission of L-band intermediate frequency signals (actually covering 500 MHz-2.5 GHz) and 10MHz reference clocks from the tower base end to the antenna end.
Referring to fig. 2, the front end component includes a front end shielding box, and a front end power supply unit, a front end tube wavelength division multiplexer, and a front end photoelectric rf processing unit disposed in the front end shielding box. The front-end shielding box is provided with a front-end external power input interface, a front-end optical interface and a front-end mixed radio frequency interface. The external power supply input end of the front-end power supply unit is connected with the front-end external power supply input interface on the front-end shielding box, and the active power supply output end of the front-end power supply unit is connected with the active power supply input end of the front-end photoelectric radio frequency processing unit. The combined optical port of the front-end tube-type wavelength division multiplexer is connected with the front-end optical interface on the front-end shielding box, and the intermediate-frequency optical output end and the clock optical output end of the front-end tube-type wavelength division multiplexer are respectively connected with the intermediate-frequency optical input end and the clock optical input end of the front-end photoelectric radio-frequency processing unit. The mixed radio frequency output end of the front-end photoelectric radio frequency processing unit is connected with a front-end mixed radio frequency interface on the front-end shielding box. The rear end component comprises a rear end shielding box, and a rear end power supply unit, a rear end photoelectric radio frequency processing unit and a rear end pipe type wavelength division multiplexer which are arranged in the rear end shielding box. The rear-end shielding box is provided with a rear-end external power input interface, a rear-end mixed radio frequency interface and a rear-end optical interface. The external power supply input end of the rear-end power supply unit is connected with the rear-end external power supply input interface on the rear-end shielding box, and the active power supply output end of the rear-end power supply unit is connected with the active power supply input end of the rear-end photoelectric radio frequency processing unit. The mixed radio frequency input end of the rear-end photoelectric radio frequency processing unit is connected with the rear-end mixed radio frequency interface on the rear-end shielding box, and the intermediate frequency light output end and the clock light output end of the rear-end photoelectric radio frequency processing unit are respectively connected with the intermediate frequency light input end and the clock light input end of the rear-end tubular wavelength division multiplexer. And the combined optical port of the rear-end tube type wavelength division multiplexer is connected with a rear-end optical interface on the rear-end shielding box. The rear end optical interface on the rear end shielding box is connected with the front end optical interface on the front end shielding box through an optical cable.
The front end shielding box and the rear end shielding box are double-layer cavity shielding boxes, the interior of the front end shielding box and the rear end shielding box is designed in a double-layer separation mode, the photoelectric radio frequency processing unit is located on the upper layer of the double-layer cavity shielding boxes, the tubular wavelength division multiplexer and the power supply unit are located on the lower layer of the double-layer cavity shielding boxes, and the upper cavity and the lower cavity are both covered by a cover plate through a parallel seam welding process after debugging is finished. All external interfaces on the front-end shielding box and the rear-end shielding box are all of waterproof design. The front-end hybrid radio frequency interface and the rear-end hybrid radio frequency interface are both N-J type connectors. The front end optical interface and the rear end optical interface are both photoelectric aerospace sockets. The front-end external power supply input interface and the rear-end external power supply input interface are both SMA-K type or F-K type connectors.
The internal structure of the front-end component includes a front-end power supply unit, a front-end tube wavelength division multiplexer, and a front-end optical electrical rf processing unit, as shown in fig. 3.
The front-end photoelectric radio frequency processing unit comprises a front-end intermediate frequency coaxial detector, a front-end intermediate frequency low noise amplifier, a front-end high-pass filter, a front-end clock coaxial detector, a front-end clock AGC amplifier, a front-end low-pass filter and a front-end combiner. The input end of the front-end intermediate frequency coaxial detector forms the intermediate frequency light input end of the front-end photoelectric radio frequency processing unit. The output end of the front-end intermediate frequency coaxial detector is connected with the input end of the front-end high-pass filter through the front-end intermediate frequency low-noise amplifier, and the output end of the front-end high-pass filter is connected with the intermediate frequency input end of the front-end combiner. The input end of the front-end clock coaxial detector forms a clock light input end of the front-end photoelectric radio frequency processing unit. The output end of the front-end clock coaxial detector is connected with the input end of the front-end low-pass filter through the front-end clock AGC amplifier, and the output end of the front-end low-pass filter is connected with the clock input end of the front-end combiner. The output end of the front-end combiner forms a mixed radio frequency output end of the front-end photoelectric radio frequency processing unit. The power supply ends of the front-end intermediate frequency coaxial detector, the front-end intermediate frequency low-noise amplifier, the front-end clock coaxial detector and the front-end clock AGC amplifier form an active power supply input end of the front-end photoelectric radio frequency processing unit. The front-end photoelectric radio frequency processing unit mainly completes photoelectric conversion, amplification and filtering processing of an uplink intermediate frequency signal, photoelectric conversion, amplification and filtering processing of an uplink 10MHz reference clock signal, and combination of an intermediate frequency signal and a clock signal.
The front-end power supply unit comprises a front-end direct current filter and a front-end DC/DC power supply module. The input of the front-end dc filter forms the external power input of the front-end power supply unit. The output end of the front-end direct current filter is connected with the input end of the front-end DC/DC power supply module. The output of the front-end DC/DC power supply module forms the active supply output of the front-end power supply unit. The front-end power supply unit only supplies power to the current assembly, direct current is input from an external power supply input interface and is sent to a direct current filter to filter power supply interference clutter, the filtered direct current is input into a DC/DC power supply module, the DC/DC power supply module can convert a direct current power supply with the input range of 8V-25V into two groups of direct currents of +5V and-5V and output the two groups of direct currents to an uplink front-end photoelectric radio frequency processing unit, wherein the maximum load of +5V is 200mA, the maximum load of 5V is 100mA, the conversion efficiency is calculated according to 70%, and the maximum power consumption of the assembly is not more than 3W.
The front-end tube-type wavelength division multiplexer comprises 1550nm and 1310nm channels, a channel window is lambda +/-10 nm (lambda is the central wavelength), the isolation degree is larger than 30dB, and the channel window is wide enough to cover the wavelength drift range (lambda-7.5 nm-lambda +5nm) of the coaxial laser when the coaxial laser works at high and low temperatures (50 ℃ to 75 ℃).
The 1550nm intermediate-frequency optical signal is separated by a front-end tube-type wavelength division multiplexer and injected into a front-end coaxial intermediate-frequency detector, and the working frequency band of the front-end intermediate-frequency coaxial detector selected in the embodiment covers 5 MHz-3.5 GHz. After the front end coaxial intermediate frequency detector carries out optical/electrical conversion, the recovered radio frequency signal is output to a front end intermediate frequency low noise amplifier, the front end intermediate frequency low noise amplifier is selected to have gain larger than 22dB in a frequency range of 500 MHz-3 GHz, noise coefficient smaller than 3dB and output 1dB compression point larger than 18 dBm. The rear stage of the front-end intermediate frequency low noise amplifier is a front-end high pass filter which mainly plays a role in enhancing the isolation degree with a reference clock channel. The insertion loss of the front-end high-pass filter used in the embodiment is less than 1dB from 500MHz to 2.5GHz, and the rejection ratio at a frequency point of 10MHz is more than 60 dBc. The filtered intermediate frequency signal is output by the mixed radio frequency interface after passing through the front end combiner. The gain of the intermediate-frequency optical transmission link composed of the front-end components and the back-end components designed in the embodiment is larger than 0dB within the transmission distance within 10 km.
The 1310nm optical signal of the 10MHz reference clock is injected into the front-end clock coaxial detector after being separated by the front-end tube type wavelength division multiplexer. The working frequency band of the front-end clock coaxial detector is selected to cover 5 MHz-3.5 GHz. The front-end coaxial clock detector outputs the recovered radio-frequency signal to a front-end clock AGC amplifier after optical/electrical conversion, the maximum gain of the front-end clock AGC amplifier selected in the embodiment is larger than 35dB, the automatic gain adjustment dynamic state is larger than 30dB, the stable amplitude output value of the front-end clock AGC amplifier is set to 10dBm, and the front-end clock AGC amplifier can ensure that the clock power output by a front-end component can not cause clock output power fluctuation due to optical path insertion loss change or input power change when the front-end clock AGC amplifier is used at different transmission distances. The rear stage of the front-end clock AGC amplifier is a front-end low-pass filter which is mainly used for enhancing the isolation degree with an intermediate frequency channel, the insertion loss of a 10MHz frequency point of the front-end low-pass filter selected in the embodiment is less than 1dB, and the rejection ratio of 500 MHz-2.5 GHz is more than 50 dBc. The filtered clock signal is output by the radio frequency interface after passing through the front-end combiner. The clock optical transmission link composed of the front end component and the back end component designed by the embodiment has the clock output power of 4 dBm-6 dBm within the transmission distance within 10km, and meets the input power requirement of the reference clock of the LNB.
The internal structure of the back-end component includes a back-end power supply unit, a back-end tube wavelength division multiplexer, and a back-end photoelectric rf processing unit, as shown in fig. 3.
The back-end photoelectric radio frequency processing unit comprises a back-end power divider, a back-end high-pass filter, a back-end intermediate frequency low-noise amplifier, a back-end intermediate frequency coaxial laser, a back-end intermediate frequency light control circuit, a back-end low-pass filter, a back-end clock low-noise amplifier, a back-end clock coaxial laser and a back-end clock light control circuit. And the input end of the rear-end power divider forms a mixed radio frequency input end of the rear-end photoelectric radio frequency processing unit. The intermediate-frequency output end of the rear-end power divider is connected with the input end of a rear-end intermediate-frequency low-noise amplifier through a rear-end high-pass filter, the output end of the rear-end intermediate-frequency low-noise amplifier is connected with the input end of a rear-end intermediate-frequency coaxial laser, and the output end of the rear-end intermediate-frequency coaxial laser forms the intermediate-frequency light output end of a rear-end photoelectric radio-frequency processing unit. The output end of the rear-end intermediate-frequency light control circuit is connected with the control end of the rear-end intermediate-frequency coaxial laser. The clock output end of the rear-end power divider is connected with the input end of a rear-end clock low-noise amplifier through a rear-end low-pass filter, the output end of the rear-end low-noise amplifier is connected with the input end of a rear-end clock coaxial laser, and the output end of the rear-end clock coaxial laser forms the clock output end of a rear-end photoelectric radio frequency processing unit. The output end of the back-end clock light-operated circuit is connected with the control end of the back-end clock coaxial laser. And power supply ends of the rear-end intermediate-frequency low-noise amplifier, the rear-end intermediate-frequency coaxial laser, the rear-end intermediate-frequency light control circuit, the rear-end clock low-noise amplifier, the rear-end clock coaxial laser and the rear-end clock light control circuit form an active power supply input end of the rear-end photoelectric radio frequency processing unit. The back-end photoelectric radio frequency processing unit completes the filtering, amplification and photoelectric conversion processing of the uplink intermediate frequency signal, completes the filtering, amplification and photoelectric processing of the 10MHz reference clock signal and the separation of the intermediate frequency signal and the clock signal.
The back-end power supply unit comprises a back-end direct current filter and a back-end DC/DC power supply module. The input end of the rear-end direct-current filter forms the external power supply input end of the rear-end power supply unit. The output end of the rear-end direct current filter is connected with the input end of the rear-end DC/DC power supply module. And the output end of the back-end DC/DC power supply module forms an active power supply output end of the back-end power supply unit. The rear-end power supply unit only supplies power to the current assembly, direct current is input from an external power supply input interface and is sent to a direct current filter to filter power supply interference clutter, the filtered direct current is input into a DC/DC power supply module, the DC/DC power supply module can convert a direct current power supply with the input range of 8V-25V into two groups of direct currents of +5V and-5V and output the two groups of direct currents to the uplink front-end photoelectric radio frequency processing unit, wherein the maximum load of +5V is 200mA, the maximum load of 5V is 100mA, the conversion efficiency is calculated according to 70%, and the maximum power consumption of the assembly is not more than 3W.
The rear-end tube-type wavelength division multiplexer comprises 1550nm and 1310nm channels, a channel window is lambda +/-10 nm (lambda is the central wavelength), the isolation degree is larger than 30dB, and the channel window is wide enough to cover the wavelength drift range (lambda-7.5 nm-lambda +5nm) of the coaxial laser when the coaxial laser works at high and low temperatures (50 ℃ to 75 ℃).
In view of size limitation, the back-end power divider selected in this embodiment is a power divider chip, which can only cover 5MHz to 2.5GHz, and the 10MHz insertion loss is less than 4 dB. Because the rear-end power divider is a broadband device, the isolation between the intermediate frequency band and the reference clock is less than 20dB, and the isolation is not enough, the reference clock signal is input into the rear-end low-pass filter after passing through the rear-end power divider. The back-end low-pass filter is used for increasing the isolation degree with the intermediate-frequency signals, the back-end low-pass filter selected in the embodiment is an LTCC type LC filter chip, the insertion loss of a 10MHz frequency point is less than 1dB, and the rejection ratio of 500 MHz-2.5 GHz is more than 50 dBc. The signal is amplified by using a rear-end clock low-noise amplifier after filtering, the gain of the selected clock low-noise amplifier in the frequency range of 1 MHz-100 MHz is more than 15dB, the noise coefficient is less than 3dB, and the output 1dB compression point is more than 18 dBm. The signal output by the back-end clock low-noise amplifier enters a back-end clock coaxial laser, the working frequency band of the back-end clock coaxial laser selected in the embodiment covers 5 MHz-3.5 GHz, and the working wavelength is 1310 nm. And controlling the rear-end clock coaxial laser through a rear-end clock light control circuit to enable the fiber output power of the rear-end clock coaxial laser to be larger than 7dBm, and injecting the fiber into the rear-end tube type wavelength division multiplexer. The back-end clock light control circuit of this example is implemented by a monolithic integrated circuit. The back-end component designed in this example has a 1dB compression point of the input of the clock link of about +8dBm, which can match the conventional clock output power (+3 dBm- +7 dBm).
The intermediate frequency signal is input into a back end component through an N-J type radio frequency interface and enters a back end power divider. Because the rear-end power divider is a broadband device, the isolation between the intermediate frequency band and the reference clock is less than 20dB, and the isolation is not enough, the intermediate frequency signal is input into the rear-end high-pass filter after passing through the power divider, and the insertion loss of the intermediate frequency band power divider is less than 5 dB. The back-end high-pass filter is used for increasing the isolation degree with the reference clock, the back-end high-pass filter selected in the embodiment is an LTCC type LC filter chip, the insertion loss of 500 MHz-2.5 GHz is less than 1dB, and the rejection ratio at a 10MHz frequency point is more than 60 dBc. The signal is amplified by using a rear-end intermediate frequency low noise amplifier after filtering, the gain of the rear-end intermediate frequency low noise amplifier in the frequency range of 500 MHz-3 GHz is more than 18dB, the noise coefficient is less than 3dB, and the output 1dB compression point is more than 20 dBm. The signal output by the back-end intermediate frequency low noise amplifier enters a back-end intermediate frequency coaxial laser, the working frequency band of the back-end intermediate frequency coaxial laser selected in the embodiment covers 5 MHz-3.5 GHz, and the working wavelength is 1550 nm. And controlling the rear-end intermediate-frequency coaxial laser through a rear-end intermediate-frequency light control circuit to enable the fiber output power of the rear-end intermediate-frequency coaxial laser to be larger than 7dBm, and injecting the fiber into the rear-end tubular wavelength division multiplexer. The back-end intermediate frequency light control circuit of the present example is implemented by a monolithic integrated circuit. The back-end components of this example are designed in which the input 1dB compression point of the intermediate frequency link is approximately +7dBm, which can be matched to the input power of a conventional BUC device.
The invention designs a photoelectric radio frequency feeder line component which realizes the fiber replacement of a radio frequency feeder line by matching a miniaturized plug-and-play component with a photoelectric mixed radio frequency cable/optical cable. Because the front end component and the back end component both use miniaturized designs, the front end component can be directly screwed on a radio frequency input interface of the BUC equipment at an antenna end, and the back end component can also be directly screwed on a clock at a machine room end and an output port of intermediate frequency equipment. The rear end optical interface on the rear end shielding box is connected with the front end optical interface on the front end shielding box through an optical cable. The inside of the optical cable is 1-core optical fiber, and the outer cladding has the anti-pulling performance and is suitable for outdoor placement. The fiber optic cable can be directly threaded onto the front end assembly and the back end assembly for in situ replacement. The invention can extend the transmission distance of the original radio frequency feeder line connecting the antenna end and the tower base end from dozens of meters to more than 10km, directly realize in-situ substitution, and can conveniently realize the remote layout of the antenna end equipment and the tower base end equipment.
Claims (7)
1. The photoelectric radio frequency feeder line component is applied to an uplink communication link and is characterized by comprising a front end component, a back end component and an optical cable;
the front end component comprises a front end shielding box, and a front end power supply unit, a front end tubular wavelength division multiplexer and a front end photoelectric radio frequency processing unit which are arranged in the front end shielding box; the front-end shielding box is provided with a front-end external power input interface, a front-end optical interface and a front-end mixed radio frequency interface; the external power supply input end of the front-end power supply unit is connected with the front-end external power supply input interface on the front-end shielding box, and the active power supply output end of the front-end power supply unit is connected with the active power supply input end of the front-end photoelectric radio frequency processing unit; the combined optical port of the front-end tube-type wavelength division multiplexer is connected with a front-end optical interface on the front-end shielding box, and the intermediate-frequency optical output end and the clock optical output end of the front-end tube-type wavelength division multiplexer are respectively connected with the intermediate-frequency optical input end and the clock optical input end of the front-end photoelectric radio-frequency processing unit; the mixed radio frequency output end of the front-end photoelectric radio frequency processing unit is connected with a front-end mixed radio frequency interface on the front-end shielding box;
the rear end component comprises a rear end shielding box, and a rear end power supply unit, a rear end photoelectric radio frequency processing unit and a rear end pipe type wavelength division multiplexer which are arranged in the rear end shielding box; the rear-end shielding box is provided with a rear-end external power input interface, a rear-end mixed radio frequency interface and a rear-end optical interface; the external power supply input end of the rear-end power supply unit is connected with the rear-end external power supply input interface on the rear-end shielding box, and the active power supply output end of the rear-end power supply unit is connected with the active power supply input end of the rear-end photoelectric radio frequency processing unit; the mixed radio frequency input end of the rear-end photoelectric radio frequency processing unit is connected with a rear-end mixed radio frequency interface on the rear-end shielding box, and the intermediate frequency light output end and the clock light output end of the rear-end photoelectric radio frequency processing unit are respectively connected with the intermediate frequency light input end and the clock light input end of the rear-end tubular wavelength division multiplexer; the combined optical port of the rear-end tube type wavelength division multiplexer is connected with a rear-end optical interface on the rear-end shielding box;
the rear end optical interface on the rear end shielding box is connected with the front end optical interface on the front end shielding box through an optical cable.
2. The optical-electrical rf feeder assembly as claimed in claim 1, wherein the front-end optical-electrical rf processing unit comprises a front-end if coaxial detector, a front-end if low noise amplifier, a front-end high pass filter, a front-end clock coaxial detector, a front-end clock AGC amplifier, a front-end low pass filter and a front-end combiner;
the input end of the front-end intermediate frequency coaxial detector forms the intermediate frequency light input end of the front-end photoelectric radio frequency processing unit; the output end of the front-end intermediate frequency coaxial detector is connected with the input end of a front-end high-pass filter through a front-end intermediate frequency low-noise amplifier, and the output end of the front-end high-pass filter is connected with the intermediate frequency input end of a front-end combiner;
the input end of the front-end clock coaxial detector forms a clock light input end of the front-end photoelectric radio frequency processing unit; the output end of the front-end clock coaxial detector is connected with the input end of a front-end low-pass filter through a front-end clock AGC amplifier, and the output end of the front-end low-pass filter is connected with the clock input end of a front-end combiner;
the output end of the front-end combiner forms a mixed radio frequency output end of the front-end photoelectric radio frequency processing unit;
the power supply ends of the front-end intermediate frequency coaxial detector, the front-end intermediate frequency low-noise amplifier, the front-end clock coaxial detector and the front-end clock AGC amplifier form an active power supply input end of the front-end photoelectric radio frequency processing unit.
3. The opto-electronic radio frequency feeder assembly for use in an uplink communication link according to claim 1,
the back-end photoelectric radio frequency processing unit comprises a back-end power divider, a back-end high-pass filter, a back-end intermediate frequency low-noise amplifier, a back-end intermediate frequency coaxial laser, a back-end intermediate frequency light control circuit, a back-end low-pass filter, a back-end clock low-noise amplifier, a back-end clock coaxial laser and a back-end clock light control circuit;
the input end of the rear-end power divider forms a mixed radio frequency input end of the rear-end photoelectric radio frequency processing unit;
the output end of the rear-end intermediate-frequency coaxial laser forms the intermediate-frequency light output end of the rear-end photoelectric radio-frequency processing unit; the output end of the rear-end intermediate-frequency light control circuit is connected with the control end of the rear-end intermediate-frequency coaxial laser;
the clock output end of the rear-end power divider is connected with the input end of a rear-end clock low-noise amplifier through a rear-end low-pass filter, the output end of the rear-end low-noise amplifier is connected with the input end of a rear-end clock coaxial laser, and the output end of the rear-end clock coaxial laser forms the clock output end of a rear-end photoelectric radio frequency processing unit; the output end of the back-end clock light-operated circuit is connected with the control end of the back-end clock coaxial laser;
and power supply ends of the rear-end intermediate-frequency low-noise amplifier, the rear-end intermediate-frequency coaxial laser, the rear-end intermediate-frequency light control circuit, the rear-end clock low-noise amplifier, the rear-end clock coaxial laser and the rear-end clock light control circuit form an active power supply input end of the rear-end photoelectric radio frequency processing unit.
4. The opto-electronic radio frequency feeder assembly for use in an uplink communication link of claim 1, wherein the front end power supply unit comprises a front end DC filter and a front end DC/DC power supply module;
the input end of the front-end direct current filter forms the external power supply input end of the front-end power supply unit; the output end of the front-end direct current filter is connected with the input end of the front-end DC/DC power supply module; the output of the front-end DC/DC power supply module forms the active supply output of the front-end power supply unit.
5. The opto-electronic radio frequency feeder assembly for use in an uplink communication link of claim 1, wherein the back-end power supply unit comprises a back-end DC filter and a back-end DC/DC power supply module;
the input end of the rear-end direct current filter forms the external power supply input end of the rear-end power supply unit; the output end of the rear-end direct current filter is connected with the input end of the rear-end DC/DC power supply module; and the output end of the back-end DC/DC power supply module forms an active power supply output end of the back-end power supply unit.
6. The opto-electronic radio frequency feeder assembly for use in an uplink communication link of claim 1, wherein the front shield box and the back shield box are both double cavity shield boxes;
the front-end photoelectric radio frequency processing unit is positioned on the upper layer of the front-end shielding box, and the front-end tubular wavelength division multiplexer and the front-end power supply unit are positioned on the lower layer of the front-end shielding box;
the rear-end photoelectric radio frequency processing unit is positioned on the upper layer of the rear-end shielding box, and the rear-end tubular wavelength division multiplexer and the rear-end power supply unit are positioned on the lower layer of the rear-end shielding box.
7. The opto-electronic radio frequency feeder assembly for use in an uplink communication link of claim 1, wherein the front hybrid radio frequency interface and the back hybrid radio frequency interface are both N-J type connectors; the front-end optical interface and the rear-end optical interface are both photoelectric aerospace sockets; the front-end external power supply input interface and the rear-end external power supply input interface are both SMA-K type or F-K type connectors.
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| CN202010722594.2A CN111884723B (en) | 2020-07-24 | 2020-07-24 | Photoelectric radio frequency feeder line assembly applied to uplink communication link |
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| CN202010722594.2A CN111884723B (en) | 2020-07-24 | 2020-07-24 | Photoelectric radio frequency feeder line assembly applied to uplink communication link |
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| CN204855812U (en) * | 2015-03-06 | 2015-12-09 | 中国人民解放军63961部队 | Difference information transmission means |
| CN105403870A (en) * | 2015-12-02 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | General signal generator for radar target simulation |
| CN108847891A (en) * | 2018-05-30 | 2018-11-20 | 武汉虹信通信技术有限责任公司 | A kind of distributed small base station system of light-carried wireless electricity |
| CN212572562U (en) * | 2020-07-24 | 2021-02-19 | 中国电子科技集团公司第三十四研究所 | Photoelectric radio frequency feeder line component applied to uplink communication link |
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2020
- 2020-07-24 CN CN202010722594.2A patent/CN111884723B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204855812U (en) * | 2015-03-06 | 2015-12-09 | 中国人民解放军63961部队 | Difference information transmission means |
| CN105403870A (en) * | 2015-12-02 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | General signal generator for radar target simulation |
| CN108847891A (en) * | 2018-05-30 | 2018-11-20 | 武汉虹信通信技术有限责任公司 | A kind of distributed small base station system of light-carried wireless electricity |
| CN212572562U (en) * | 2020-07-24 | 2021-02-19 | 中国电子科技集团公司第三十四研究所 | Photoelectric radio frequency feeder line component applied to uplink communication link |
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| CN111884723B (en) | 2024-05-28 |
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