TW201320635A - Optical LNB and optical receiver thereof - Google Patents

Abstract

An optical LNB and an optical receiver thereof are provided. The optical LNB includes a waveguide probe, a frequency conversion circuit, a first optical transmitter module, a second optical transmitter module, and a wavelength division multiplexing (WDM) multiplexer. The waveguide probe receives 4 polarization RF signals (HH, HL, VH, VL). The frequency conversion circuit converts horizontal and vertical polarization RF signals received by the optical LNB into horizontal and vertical polarization intermediate frequency (IF) signals. The first and the second optical transmitter modules respectively transmits optical sources with a first wavelength and a second wavelength, so as to respectively modulate the horizontal and vertical polarization IF signals into optical signals of the first and the second wavelength. The WDM multiplexer combines the optical signals of the first and the second wavelength into an optical beam, and output the optical beam into an optical fiber.

Description

Optical transmission satellite frequency reducer and optical transmission receiver

The present invention relates to an optical transmission satellite downconverter, and more particularly to an optical transmission satellite downconverter having a receiving satellite television, a digital television, a digital audio broadcasting and a cable television signal or can be used to connect a passive optical network and Optical transmission receiver.

The Direct Broadcasting Satellite (DBS) is a transmission medium that uses high-altitude geosynchronous satellites as a television program signal. The program is transmitted to the satellite through a terrestrial station, and the microwave signal is transposed through a satellite transponder. After 10.7~12.75 GHz, the signal is sent back to the receiving end of the terrestrial viewer. The downlink signal includes four different polarized RF bands, which are horizontal high-band signals (HH) and horizontal poles. The low-band signal (HL), the vertical high-band (VH), and the vertical low-band (VL).

The ground-based viewers pass through a satellite dish located outside and a satellite down-converter (or low-noise block, also referred to as LNB) fixed to the parabolic focus of the satellite dish. Receiving four polarized RF signals (HH, HL, VH, VL) transmitted by the satellite, and converting the signal down, amplifying, filtering noise into an intermediate frequency signal with a frequency between 0.95 and 5.45 GHz, and then After being transmitted to the client tuner or the set-top box through the coaxial cable, the TV is finally presented to the viewer. However, the signal in the coaxial cable will attenuate the signal with the transmission distance, especially the higher the frequency of the transmitted signal, the greater the attenuation. Therefore, the satellite live broadcast system (DBS) uses coaxial cable to transmit satellite television signals, which has been limited by the high-frequency signal attenuation, which is easy to cause signal distortion, and is not conducive to distributing signals to multiple indoor users and long-distance transmission applications.

To solve this problem, the satellite live broadcast system (DBS) has been developed to use Hybrid Fiber Coax (HFC) to transmit satellite TV signals through a structured optical communication network for point-to-multipoint signal broadcasting or point-to-point long-distance transmission. The medium solves the problem that some high frequency signals will attenuate and be distorted. However, in the transmission process, the satellite IF signal of the higher frequency band is converted into an optical signal and transmitted through the optical fiber. Because the optical fiber has the characteristics of dispersion, the signal of the higher frequency band may encounter more severe signal distortion after transmission.

According to an embodiment of the invention, an optical transmission satellite frequency reducer is provided. The optical transmission satellite frequency reducer comprises: a waveguide probe, a frequency reduction filter circuit, a first light emission module, a second light emission module and a split wave multiplexer. The waveguide probe receives four polarized RF signals (HH, HL, VH, VL) transmitted by a satellite transponder. The down-converting filter circuit is connected to the waveguide probe, and the horizontally polarized signal and the vertically polarized signal are respectively down-converted into a horizontally polarized intermediate frequency signal and a vertically polarized intermediate frequency signal in the same frequency range. The first light emitting module is connected to the down-converting filter circuit for emitting a first-wavelength laser light or a light-emitting diode light source, and adjusting the vertically-polarized intermediate frequency signal (VH, VL) to have a first Optical signal of wavelength. The second light emitting module is connected to the down-converting filter circuit for emitting a laser light or a light-emitting diode light source of a second wavelength different from the first wavelength, and the horizontally polarized intermediate frequency signal (HH, HL) ) is modulated into an optical signal having a second wavelength. In addition, the split multiplexer is connected to the first light emitting module and the second light emitting module for receiving and concentrating the optical signal having the first wavelength and the optical signal having the second wavelength as a light beam. And output this beam to a fiber optic cable.

According to an embodiment of the invention, an optical transmission receiver is provided. The optical transmission receiver includes: a demultiplexing multiplexer, a first optical receiving module, a second optical receiving module and a down-converting filter circuit. The demultiplexing multiplexer is configured to receive a light beam from a fiber optic cable and separate the light beam into an optical signal having at least a first wavelength and an optical signal having a second wavelength. The first light receiving module is connected to the demultiplexing multiplexer for receiving and converting the optical signal having the first wavelength into a vertically polarized intermediate frequency signal (VH, VL) and a multimedia intermediate frequency signal. The second light receiving module is connected to the demultiplexing multiplexer for receiving and converting the optical signal having the second wavelength into a horizontally polarized intermediate frequency signal (HH, HL) and a multimedia intermediate frequency signal. In addition, the frequency reduction filter circuit is connected to the first light receiving module and the second light receiving module for respectively filtering the vertically polarized intermediate frequency signal (VH, VL) and the horizontally polarized intermediate frequency signal (HH, HL). And output four polarized RF signals (HH, HL, VH, VL).

The above described features and advantages of the present invention will be more apparent from the following description.

The invention discloses an optical transmission satellite frequency reducer and an optical transmission receiver thereof for receiving a satellite television signal, and converting the received satellite television signal into an optical signal, which is then transmitted by an optical cable, but completely changes the satellite. The key techniques of the present invention are as follows. (1) The proposed optical transmission satellite frequency reducer down-converts horizontally polarized radio frequency signals and vertically polarized radio frequency signals of satellite television signals into horizontally polarized intermediate frequency signals and vertical polarization in the same frequency range. Frequency signals, for example, reduce the frequency of satellite television RF signals from 10.7 to 12.75 GHz to horizontal intermediate frequency signals and vertical intermediate frequency signals between 0.95 and 3.0 GHz, excluding the use of frequencies between 3.4 and 5.45 GHz. Frequency frequency; (2) The optical transmission satellite frequency reducer proposed by the present invention is provided with two light-emitting modules respectively for transmitting laser optical carriers of different wavelengths, and horizontal IF signals and vertical intermediate frequencies belonging to the same frequency range The signals are respectively modulated into optical signals of different wavelengths, and then condensed into one beam (optical carrier) having different wavelengths, which are transmitted to the remote receiving end by the same optical fiber cable connected to the output end of the optical signal, and then received by the receiving end. The module converts the original horizontally polarized IF signal and the vertically polarized IF signal by photoelectric conversion, so that the signal attenuation and signal distortion can be greatly reduced in long-distance transmission.

Another main object of the present invention is to disclose a multi-purpose optical transmission satellite frequency reducer, which is provided with two sets of optical emission modules for respectively modulating horizontal intermediate frequency signals and vertical frequencies of 0.95 to 3.0 GHz belonging to the same bandwidth. IF signal. The multi-purpose optical transmission satellite frequency reducer, in addition to the excellent performance of receiving satellite television signals, provides additional performance to receive one or two sets of bandwidths between 5 and 900 MHz at any time (that is, 0.005 to 0.9 GHz). The multimedia signal, and through the signal superposition technology, the received 5~900 MHz multimedia signal is modulated with the 0.95~3.0 GHz horizontal intermediate frequency signal or the vertical intermediate frequency signal to the optical signal of different wavelengths. Then, the optical signals having different wavelengths are converged into one beam. The same optical cable connected to the optical signal output end is transmitted to the remote receiving end, and then photoelectrically converted into the original horizontally polarized intermediate frequency signal and the vertically polarized intermediate frequency signal through the optical receiving module of the receiving end, and one or two A group of multimedia signals with a bandwidth between 5 and 900 MHz.

The above-mentioned multi-purpose optical transmission satellite frequency reducer is a multifunctional optical transmission satellite frequency reducer that can receive satellite television, digital wireless television, digital audio broadcasting, cable television signal, wireless communication signal, or is used for connecting passive type. Multimedia multi-function optical transmission satellite frequency reducer for fiber optic networks. After being placed on the parabolic focus of the shared satellite dish antenna outdoors, all users of the community or family viewing terminal have a multimedia access function that can receive satellite TV signals or receive bandwidth by using an optical communication network with a fiber-optic structure. Digital television (DVB-T) signals between 170 and 230 MHz (VHF) and 470 to 880 MHz (UHF) and/or digital audio broadcasting (T-DAB) signals with a bandwidth between 170 and 240 MHz, or Use cable TV (CATV) multi-system services (including video, voice and broadband networks), or connect to passive optical networks (PON) to enjoy broadband network access services, or for two-way wireless communication transmission services.

1 is a schematic diagram of the structure of an optical transmission satellite frequency reducer and a flow chart for processing satellite television signals. In the satellite live broadcast system, an optical transmission satellite frequency reducer (Optical LNB) 10 as shown in FIG. 1 can replace the traditional satellite frequency reducer in the community or home viewing terminal. The optical transmission satellite frequency reducer 10 converts the received four polarized radio frequency signals into intermediate frequency signals, and then converts the intermediate frequency signals (electronic signals) into optical signals and transmits them through a single optical fiber, and during transmission, The optical signal is not easily attenuated and distorted. It can be connected to an optical splitter at any time to turn the point-to-point optical communication transmission into a point-to-multipoint optical communication broadcast network. Therefore, satellite TV signals can be transmitted independently to all users in the community or home viewing terminal without interfering with other users on the multi-channel optical communication broadcast network. In the same period of time, the community or family viewing terminal can choose to watch different satellite live broadcast programs at any time, completely without mutual interference, thereby solving the problems encountered in the community or family viewing terminal sharing satellite dish antennas.

As shown in FIG. 1 , the optical transmission satellite frequency reducer 10 includes a waveguide probe 11 , a down conversion filter circuit 13 , a duplexer 15 , an amplifier 16 , and a light emitting module 17 . In addition, the output end of the optical transmission satellite frequency reducer 10 is connected to an optical cable 18 and the optical receiving module 19 at the other end constitutes an optical fiber communication transmission system. It can be seen from the above that the optical transmission satellite downconverter 10 is an optical transmission transmitter, and the optical receiving module 19 is one of the constituent elements of the optical transmission receiver at the other end of the optical cable 18.

The optical transmission satellite frequency reducer 10 is still fixed to the parabolic focus of the satellite dish, and receives the satellite signal S1 transmitted by the satellite using the waveguide probe 11, and the satellite signal S1 includes four polarized radio frequencies. Signal (HH, HL, VH, VL). The down-conversion filter circuit 13 is connected to the waveguide probe 11, and is passed through the down-conversion filter circuit 13, and the horizontally polarized signals (HH, HL) and the vertically polarized signals (VH, VL) in the radio frequency band are respectively down-converted. The down-conversion filter circuit 13 may include two processing paths, and the first processing path includes a low noise amplifier 131, a bandpass filter 132, a mixer 133 and a A dielectric oscillator (DRO) 134; the second processing path includes a low noise amplifier 135, a band pass filter 136, a mixer 137, and a dielectric oscillator 138. As shown in FIG. 1, the first processing path reduces the vertically polarized signal (VH, VL) to an intermediate frequency of 3.4 to 5.45 GHz by the 7.3 GHz oscillating signal and the mixer 133 provided by the dielectric oscillator 134. The frequency, while the second processing path reduces the horizontally polarized signal (HH, HL) to an intermediate frequency of 0.95 to 3.0 GHz by the oscillating signal at 9.75 GHz and the mixer 137 provided by the dielectric oscillator 138.

However, the operating frequency after the horizontally polarized signal (HH, HL) and the vertically polarized signal (VH, VL) are down-converted needs to be distributed to the intermediate frequency range that does not interfere with each other, and then input to the duplexer 15 differently. Input. Through the control of the duplexer 15, two intermediate frequency signals of different frequencies will be aggregated and outputted from the same output end of the duplexer 15, and after being amplified by the amplifier 16, the optical transmitting module 17 will use the optical wave as a carrier. The electronic signal is modulated into an optical signal and transmitted to the optical cable 18. The optical signal is transmitted to the optical receiving module 19 of the community or the home viewing end via the same optical cable 18. The optical receiving module 19 converts the optical signal back to the electronic signal, and then decodes it by FM, and finally outputs it to the television terminal for viewing. As shown in FIG. 1, the intermediate frequency signal S2 before the amplifier 16 performs amplification has the same intermediate frequency as the electronic signal S3 converted by the light receiving module 19, for example, the horizontal linearly polarized signal (HH, HL) is at a frequency. Between 0.95 and 3.0 GHz, the vertically linearly polarized signals (VH, VL) are between 3.4 and 5.45 GHz.

The shortcoming of the optical transmission satellite frequency reducer 10 lies in the processing method of the satellite intermediate frequency signal, and the horizontally polarized signals (HH and HL) and the vertically polarized signals (VH and VL) after the frequency reduction of the radio frequency signal are distributed to Four different frequencies that do not interfere with each other, and only one set of light emitting modules 17 are used to convert the intermediate frequency signal into an optical signal. The result of this configuration will cause the four different frequencies after the distribution to be in the intermediate frequency range, but the horizontally polarized signals (HH and HL) or the vertically polarized signals (VH and VL) still need to be given in the higher frequency bands. deal with. For example, horizontally polarized signals (HH and HL) are down-converted into intermediate frequency signals with frequencies between 0.95 and 3.0 GHz. Vertically polarized signals (VH and VL) are converted to frequencies between 3.4 and 5.45. Higher IF signals in GHz and vice versa. During the transmission of the optical signal, the satellite IF signal of the higher frequency band is converted into an optical signal and transmitted through the optical fiber. Because the optical fiber has the characteristics of dispersion, the signal of the higher frequency band is subjected to signal distortion after transmission.

2 is a schematic diagram of an optical transmission satellite downconverter and a flowchart thereof for processing a satellite television signal according to a first embodiment of the present invention. 3 is a schematic diagram of an optical transmission satellite downconverter and a corresponding receiver according to a first embodiment of the present invention. In the first embodiment, the receiver illustrated in FIG. 3 may be disposed at a community or home viewing end. The optical fiber communication transmission architecture shown in FIG. 3 includes the optical transmission satellite frequency converter 20 illustrated in FIG. 2 connected to an optical cable 18 through its output end, and forms an optical fiber communication transmission with the optical transmission receiver 30 at the other end of the optical cable 18. Architecture, this fiber-optic communication transmission architecture enables users of community or home viewing stations to receive satellite TV signals.

As shown in FIG. 2 and FIG. 3, the optical transmission satellite frequency reducer 20 of the present invention is fixed to the parabolic focus of the satellite dish and receives the satellite television signal transmitted from the satellite transponder. The first embodiment of the present invention The optical transmission satellite frequency reducer 20 includes a waveguide probe 21, a down-conversion filter circuit 23, a first light-emitting module 25, a second light-emitting module 26, and a wavelength division multiplexer 29. In addition, the output of the optical transmission satellite downconverter 20 is connected to a cable or the community or home viewing end of the other end of the optical cable 18 to form a satellite television signal fiber transmission system for the user of the community or family viewing terminal to view the satellite television.

The satellite television signal transmitted from the satellite transponder is a radio frequency signal with a frequency between 10.7 and 12.75 GHz and has four different polarization band signals (HH, HL, VH, VL). The waveguide probe 21 is configured to receive a radio frequency signal transmitted by a satellite (that is, a satellite signal S1), and the receiving range includes a vertically polarized signal (VH and VL) having a frequency between 10.7 and 12.75 GHz and a frequency of 10.7. Horizontally polarized signals (HH and HL) of ~12.75 GHz. The down-converting filter circuit 23 is composed of a low noise amplifier, a bandpass filter, a dielectric oscillator (DRO), and a mixer, and the waveguide probe 21 Form a parallel line connection. Therefore, the vertically polarized signals (VH and VL) and the horizontally polarized signals (HH and HL) received by the waveguide probe 21 are respectively filtered and down-converted by the down-conversion filter circuit 23, and are respectively reduced to the same frequency range. Vertically polarized IF signals (VH and VL) and horizontally polarized IF signals (HH and HL). A preferred embodiment of the present invention downconverts both vertically polarized intermediate frequency signals (VH and VL) and horizontally polarized intermediate frequency signals (HH and HL) to a frequency range that is also between 0.95 and 3.0 GHz.

In more detail, the down-conversion filter circuit 23 is connected to the waveguide probe 21, and the down-conversion filter circuit 23 includes a dielectric oscillator (DRO) 231, a low noise amplifier 232, a band pass filter 233, a mixer 234, Bandpass filter 235, low noise amplifier 236, bandpass filter 237, mixer 238, bandpass filter 239. a dielectric oscillator (DRO) 231, a low noise amplifier 232, a band pass filter 233, a mixer 234, and a band pass filter 235 constitute a first processing path of the down conversion filter circuit 23; a dielectric oscillator (DRO) 231, The low noise amplifier 236, the band pass filter 237, the mixer 238, and the band pass filter 239 constitute a second processing path of the down conversion filter circuit 23.

The low noise amplifier 232 receives the vertically polarized signals (VH and VL) from the waveguide probe 21, filters the vertically polarized signals (VH and VL) through the band pass filter 233, and the dielectric oscillator (DRO) 231. A local-end oscillating signal is supplied to the mixer 234, and the vertically-polarized signals (VH and VL) are down-converted to an intermediate frequency signal having a frequency between 0.95 and 3.0 GHz, and then filtered by a bandpass filter 235, and then output. The filtered intermediate frequency signals (including the vertically polarized signals (VH and VL)) are supplied to the first light emitting module 25.

More clearly, in the first processing path, the low noise amplifier 232 gains the vertically polarized signals (VH and VL) received by the waveguide probe 21. The bandpass filter 233 is coupled to the low noise amplifier 232 to filter the noise of the gained vertically polarized signals (VH and VL) outside the preset frequency band of the first processing path. The dielectric oscillator 231 provides a local-side oscillating signal at a frequency of 9.75 GHz. The mixer 234 is coupled to the bandpass filter 233 and the dielectric oscillator 231 for receiving the local oscillating signal and the vertically polarized signal (VH and VL) filtered by the low noise amplifier 232, and down-clocking the filtered vertical Polarized signals (VH and VL) to vertically polarized IF signals with frequencies between 0.95 and 3.0 GHz. A bandpass filter 235 is coupled to the mixer 234 for filtering noise from the vertically polarized IF signal outside the 0.95 to 3.0 GHz band. The bandpass filter 235 outputs the filtered vertically polarized intermediate frequency signal to the first light emitting module 25.

Similarly, the low noise amplifier 236 receives the horizontally polarized signals (HH and HL) from the waveguide probe 21, the horizontally polarized signals (HH and HL) through the bandpass filter 237, and the dielectric oscillator. (DRO) 231 provides a local-end oscillating signal to the mixer 238, and then down-converts the horizontally polarized signals (HH and HL) to an intermediate frequency signal having a frequency between 0.95 and 3.0 GHz, and then filters the signal through a bandpass filter 239. Thereafter, the filtered horizontally polarized intermediate frequency signal (including the horizontally polarized signals (VH and VL)) is output to the second light emitting module 26.

The first light emitting module 25 can include a laser, a driving circuit, and a first light source component for converting an electronic signal into an optical signal. The first light source element may be a laser diode or a light emitting diode (LED) for emitting a λ 1 wavelength laser light or a light emitting diode light source.

Therefore, the vertically polarized intermediate frequency signals (VH and VL) that are down-converted by the down-converting filter circuit 23 are modulated by the first light-emitting module 25 into an optical signal having a wavelength of λ 1 and are used by the first light. The optical path 18-1 at the output of the transmitting module 25 is transmitted to an input of the split multiplexer 29 at the other end.

The second light emitting module 26 includes a laser, a driving circuit and a second light source element, which are also used to convert an electronic signal into an optical signal; the second light source element can also use a laser diode or a light emitting diode (the LED), but is different from the restriction to emit a wavelength λ 2 [lambda] the wavelength of laser light or light emitting diode light source, such that different wavelengths [lambda] 1 wavelength light and λ 2 wavelength light source may be used with the article Cable 18 transmits optical signals. Similarly, the horizontally polarized intermediate frequency signals (HH and HL) that are down-converted by the down-converting filter circuit 23 are modulated by the second light-emitting module 26 into an optical signal having a wavelength of λ 2 , and by the first The optical path 18-2 at the output of the second light emitting module 26 is transmitted to the other input of the split multiplexer 29 at the other end.

The split multiplexer 29 is used to converge optical signals of different wavelengths (corresponding to λ 1 wavelength, λ 2 wavelength) from two inputs. The splitter multiplexer 29 outputs the optical signal from the same output terminal to the same optical cable 18 to output a plurality of bundled different wavelength (color) laser light or light emitting diode light sources. It should be noted here that this technology can also achieve the effect of two-way communication through the same cable 18.

Therefore, the first light emitting module 25 is modulated into a vertically polarized intermediate frequency optical signal having a λ 1 wavelength (corresponding to λ 1 of FIG. 2), and is modulated by the second light emitting module 26 to have λ 2 . The horizontally polarized intermediate frequency optical signal of the wavelength (corresponding to λ 2 of FIG. 2) is concentrated by the splitting multiplexer 29 into a light beam (optical carrier) having a wavelength of λ 1 and a wavelength of λ 2 , and is carried by the same strip at the same output end. The optical cable 18 outputs a light beam having a wavelength of λ 1 and a wavelength of λ 2 to the other end of the optical cable 18.

As shown in FIG. 3, the other end of the optical cable 18 is directly connected or intermediately transmitted through an optical splitter, and then connected to the demultiplexing multiplexer 31 of the optical transmission receiver 30 of the community or home viewing end. The optical transmission receiver 30 includes a demultiplexing multiplexer 31, a first optical receiving module 33, a second optical receiving module 35, and a down-converting filter circuit 37. As described above, the optical signals having the λ 1 wavelength and the λ 2 wavelength which have been condensed into a light beam and transmitted from the same optical cable 18 are separated into optical signals having a λ 1 wavelength through the demultiplexing multiplexer 31 of the community or home viewing end. Optical signals having λ 2 wavelengths are output from different outputs of the demultiplexing multiplexer 31, respectively.

The optical signal having the wavelength of λ 1 is received and converted (demodulated) into an electronic signal by the first light receiving module 33, and then restored to the original vertically polarized intermediate frequency signal (VH and VL); and has λ 2 The optical signal of the wavelength is received and converted (demodulated) into an electronic signal by the second light receiving module 35, and then restored to the original horizontally polarized intermediate frequency signal (HH and HL). Then, the vertically polarized intermediate frequency signals (VH and VL) and the horizontally polarized intermediate frequency signals (HH and HL) are then passed through a satellite signal four-band output down-conversion filter circuit 37 (for convenience of understanding, hereinafter referred to as descending The frequency filter circuit 37) converts the signal into a signal that can be received by the user of the viewing end.

More clearly, the down-conversion filter circuit 37 includes a dielectric oscillator (DRO) 371, a band pass filter 372, a mixer 373, a band pass filter 374, a band pass filter 375, a band pass filter 376, and a mixture. A wave filter 377, a band pass filter 378, and a band pass filter 379. The band pass filter 372, the mixer 373, and the band pass filter 374 constitute a first processing path of the down-converting circuit 37, and the band pass filter 375 is a second processing path of the down-converting circuit 37. Further, the band pass filter 376, the mixer 377, and the band pass filter 378 constitute a third processing path of the down-converting circuit 37, and the band pass filter 379 is a fourth processing path of the down-converting circuit 37.

The band pass filter 372 receives the vertically polarized intermediate frequency signals (VH and VL) from the first light receiving module 33, and filters noise outside the frequency band of 1.95 to 3.0 GHz. The dielectric oscillator 371 provides a local-end oscillation signal having a frequency of 0.85 GHz, and the mixer 373 is connected to the band-pass filter 372 and the dielectric oscillator 371 to receive the filtered vertical-polarized intermediate frequency signals (VH and VL) and the local end oscillation. The signal, and the down-converted vertically-polarized intermediate frequency signals (VH and VL) are vertically polarized high-band signals (VH) at frequencies between 1.10 and 2.15 GHz. The band pass filter 374 is connected to the mixer 373, receives the vertically polarized high frequency signal (VH) that has been down-converted, and filters the noise of the vertically polarized high frequency signal (VH) at frequencies other than 1.10 to 2.15 GHz. And output the vertical polarized wave high frequency band signal (VH) at a frequency of 1.10~2.15 GHz.

The band pass filter 375 receives the vertically polarized intermediate frequency signals (VH and VL) from the first light receiving module 33, filters noise outside the frequency band of 0.95 to 1.95 GHz, and outputs a vertical pole having a frequency between 0.95 and 1.95 GHz. The low frequency band signal (VL).

Similarly, the band pass filter 376 receives the horizontally polarized intermediate frequency signals (HH and HL) from the second light receiving module 35, and filters noise outside the frequency band of 1.95 to 3.0 GHz. The mixer 377 is connected to the band pass filter 376 and the dielectric oscillator 371, receives the filtered horizontally polarized intermediate frequency signals (HH and HL) and the local end oscillation signal, and down-converts the horizontally polarized intermediate frequency signal (HH and HL) is a horizontally polarized high frequency signal (HH) at frequencies between 1.10 and 2.15 GHz. The bandpass filter 378 is connected to the mixer 377, receives the horizontally polarized high frequency signal (HH) that has been down-converted, and filters the noise of the horizontally polarized high frequency signal (HH) at frequencies other than 1.10 to 2.15 GHz. And output horizontal polarized wave high frequency band signal (HH) at a frequency of 1.10~2.15 GHz.

Similarly, the band pass filter 379 receives the horizontally polarized intermediate frequency signals (HH and HL) from the second light receiving module 35, filters noise in the frequency range of 0.95 to 1.95 GHz, and outputs the frequency between 0.95 and 1.95. GHz horizontally polarized low-band signal (HL).

In the following various modified embodiments, when the same components of the first embodiment are used, in order to omit the repeated description, the component symbols used in the first embodiment will be inherited and used, and the same definition and the same functions will be assigned, and the description will not be repeated. Its detailed technical content.

4 is a schematic diagram of an optical transmission satellite downconverter and a flowchart thereof for processing satellite television signals according to a second embodiment of the present invention. 4 illustrates the optical transmission satellite downconverter 40 of the second embodiment, and simultaneously illustrates that the optical transmission satellite downconverter 40 processes the satellite television signal, and processes the digital television signal (DVB-T signal) S4, A flowchart of a multimedia signal such as a digital audio broadcast signal (T-DAB signal) S5 or a cable television signal (CATV signal, or cable television downlink signal) S6.

As shown in FIG. 4, the optical transmission satellite frequency down converter 40 proposed in the second embodiment of the present invention is similar to the optical transmission satellite frequency down converter 20 in the first embodiment, but in the down conversion filter circuit 23 and the first light. Between the transmitting modules 25, a frequency division multiplexer 24 is further provided for simultaneously receiving or separately receiving the vertically polarized intermediate frequency signals (VH, VL) having a frequency between 0.95 and 3.0 GHz. And/or externally input a multimedia signal having a frequency between 5 and 900 MHz (for example, a terrestrial microwave signal), and transmitting the vertically polarized intermediate frequency signal (VH, VL) and/or the multimedia signal together by a signal superposition processing technique After the first light emitting module 25 is demodulated into an optical signal having a wavelength of λ 1 (corresponding to λ 1 in FIG. 4), and then transmitted to the other end of the optical path 18-1 by the optical path 18-1, the demultiplexing multiplexer An input of 29.

In the same situation, the optical transmission satellite frequency reducer 40 may also selectively set a frequency division multiplexer 22 between the down conversion filter circuit 23 and the second light emission module 26 for simultaneous reception or separate reception. The horizontally polarized intermediate frequency signals (HH, HL) having a frequency between 0.95 and 3.0 GHz and/or other multimedia signals having an external input frequency between 5 and 900 MHz (eg, cable television downlink signals), and superimposed by signals Processing technology, the horizontally polarized intermediate frequency signal (HH, HL) and/or the multimedia signal are passed together through the second light emitting module 26 to be converted into an optical signal having a λ 2 wavelength (corresponding to λ in FIG. 4) 2), which is further transmitted to the other input end of the split multiplexer 29 at the other end of the optical path 18-2 by the optical path 18-2.

The multimedia signal with a bandwidth between 5 and 900 MHz can be a digital television (DVB-T) signal and/or bandwidth with a bandwidth between 170 and 230 MHz (VHF) and 470 to 880 MHz (UHF). Digital audio broadcasting (T-DAB) signals between 170 and 240 MHz, or cable television (CATV) downlink signals (including video, voice and broadband network services). In other words, the optical transmission satellite frequency down converter 40 in the second embodiment of the present invention covers the functions of receiving satellite television, digital television, digital audio broadcasting and/or cable television multi-system services, and relays the above various services. Signal to the community or home client to provide multimedia services.

FIG. 5 is a schematic diagram of an optical transmission satellite downconverter and a corresponding receiver according to a second embodiment of the present invention. In the second embodiment, the optical transmission receiver 50 illustrated in FIG. 5 may be disposed at a community or home viewing end. The optical fiber communication transmission architecture shown in FIG. 5 includes the optical transmission satellite frequency reducer 40 illustrated in FIG. 4 connected to an optical cable 18 through its output end, and forms an optical fiber communication transmission with the optical transmission receiver 50 at the other end of the optical cable 18. Architecture, this fiber-optic communication transmission architecture allows users of community or home viewing stations to watch satellite TV, digital wireless TV, digital audio broadcasting or cable TV at any time.

As shown in FIG. 5, after the optical signals having different wavelengths of λ 1 wavelength and λ 2 wavelength are concentrated by the demultiplexer 29, the optical cable 18 is transmitted from the same optical cable 18 to the community or the home viewing terminal, and the solution is transmitted through the community or the home viewing terminal. The wavelength division multiplexer 31 is divided into an optical signal having a wavelength of λ 1 and an optical signal having a wavelength of λ 2 .

The optical signal having the wavelength of λ 1 is converted (demodulated) into the original vertically polarized intermediate frequency signals (VH and VL) and the ground microwave signal S7 (which may include between 174 and 862 MHz) through the first light receiving module 33. DVB-T signal and T-DAB signal). The optical signal having the λ 2 wavelength is converted (demodulated) by the second optical receiving module 35 into the original horizontally polarized intermediate frequency signals (HH and HL) and the cable television downlink signal (which may include between 50 and 870 MHz). The CATV signal) S8. Then, the satellite signal four-band output down-conversion filter circuit 37 provided with the frequency division multiplexer 36 and the frequency division multiplexer 38 is converted into a satellite television signal, a digital television signal, and a digital audio signal that can be received by the user of the receiving end. Broadcast signal or cable TV downlink signal.

More specifically, the optical transmission receiver 50 is similar to the optical transmission receiver 30 in the first embodiment except that the demultiplexing multiplexer 31, the first optical receiving module 33, the second optical receiving module 35, and the down frequency are included. In addition to the filter circuit 37, the down-conversion filter circuit 37 further includes a frequency divider multiplexer 36 between the first light receiving module 33 and the band pass filter 372, and is bandpass filtered in the second light receiving module 35. A divider multiplexer 38 is further included between the units 376.

The first light receiving module 33 receives an optical signal having a wavelength of λ 1 in the optical cable 18, and outputs a signal having a frequency of 0.174 to 3.0 GHz to the frequency divider multiplexer 36. The frequency divider multiplexer 36 separates the signal into signal S7 (which may include DVB-T signals and T-DAB signals between 174 and 862 MHz) and vertically polarized intermediate frequency signals (VH and VL). Both the band pass filter 372 and the band pass filter 375 are connected to the frequency division multiplexer 36. The bandpass filter 375 filters the vertical polarized intermediate frequency signals (VH and VL) at frequencies other than 0.95 to 1.95 GHz and outputs a vertically polarized low frequency signal (VL) at a frequency of 0.95 to 1.95 GHz.

The bandpass filter 372 filters the noise of the vertically polarized intermediate frequency signals (VH and VL) in the frequency range of 1.95 to 3.0 GHz. The mixer 373 is connected to the band pass filter 372 and the dielectric oscillator 371, receives the filtered vertical polarization intermediate frequency signals (VH and VL) and the local end oscillation signal, and down-converts the vertically polarized intermediate frequency signal (VH and VL) is a vertically polarized high frequency signal (VH) between frequencies 1.10 and 2.15 GHz.

The second light receiving module 35 receives the optical signal having the λ 2 wavelength in the optical cable 18 and outputs a signal with a frequency of 0.05 to 3.0 GHz to the frequency divider multiplexer 38. The frequency divider multiplexer 38 separates the signal into a signal S8 (which can include a CATV signal between 50 and 870 MHz) and a horizontally polarized intermediate frequency signal (HH and HL). Bandpass filter 376 and bandpass filter 379 are both coupled to frequency divider multiplexer 38. The bandpass filter 379 filters the horizontally polarized intermediate frequency signals (HH and HL) at frequencies other than 0.95 to 1.95 GHz and outputs a horizontally polarized low frequency signal (HL) at a frequency of 0.95 to 1.95 GHz.

A bandpass filter 376 filters the horizontally polarized intermediate frequency signals (HH and HL) in the frequency band from 1.95 to 3.0 GHz. The mixer 377 is connected to the band pass filter 376 and the dielectric oscillator 371, receives the filtered horizontally polarized intermediate frequency signals (HH and HL) and the local end oscillation signal, and down-converts the horizontally polarized intermediate frequency signal (HH and HL) is a horizontally polarized high frequency signal (HH) at frequencies between 1.10 and 2.15 GHz.

6 is a schematic diagram of an optical transmission satellite downconverter and a flowchart thereof for processing satellite television signals according to a third embodiment of the present invention. The optical transmission satellite downconverter 60 illustrated in FIG. 6 is similar to the optical transmission satellite downconverter 40 of the second embodiment, but the optical transmission satellite downconverter 60 can process satellite television signals, terrestrial microwave signals, and bidirectional cable. A television signal and a flow chart for connecting a passive optical network (PON) to transmit an upstream optical signal or a downstream optical signal.

As shown in FIG. 6, the optical transmission satellite downconverter 60, in addition to the constituent elements of the optical transmission satellite downconverter 40, is between the frequency division multiplexer 22 and the demultiplexing multiplexer 29. In addition, a light receiving module 27 is connected in parallel for receiving an optical signal having a λ 3 wavelength transmitted by the community or home viewing terminal via the optical cable 18 and passing through the splitting multiplexer 29. The optical signal having a λ 3 wavelength is a cable TV uplink signal (CATV Return) having a modulation frequency between 5 and 45 MHz in the preferred embodiment of the present invention. The light receiving module 27 is connected to the frequency dividing multiplexer 63. The cable television uplink signal is received by the optical receiving module 27, and is converted into an electronic signal with a frequency between 5 and 45 MHz by the optical receiving module 27, and then uploaded to the cable television (CATV) via the frequency dividing multiplexer 63. Network 61. In addition, the cable television downlink signal provided by the cable television (CATV) network 61 is also output to the frequency divider multiplexer 22 by the frequency division multiplexer 63. Therefore, the optical transmission satellite frequency reducer 60 provided by the third embodiment is further provided with real-time bidirectional communication between a community or home viewing terminal and a cable television (CATV) multi-system operator (MSO) or a user. Additional features for interaction.

EPON is an Ethernet transmission technology based on Passive Optical Network (PON). It uses point-of-flight multiplex (WDM) technology to implement point-to-multipoint bidirectional communication. In addition to EPON, there are APON, BPON, GPON and so on. An EPON system basically consists of a central office device (for example, an optical line terminal (OLT)), an optical network unit (ONU), and an optical splitter. As for the use of wavelength, EPON can select 1310 nm wavelength to transmit uplink data from the user end (ONU) to the central office (OLT), while the 1490 nm wavelength is transmitted from the central office (OLT) to the user end (ONU). data.

Since the optical splitter from the optical transmission satellite transponder to the community or home client is the same as the architecture of the EPON network, in order to make good use of the existing investment and make the network more flexible, as shown in Figure 6. As shown, the structure of the optical transmission satellite downconverter 60 provided by the third embodiment of the present invention further includes a passive optical network system (PON). More clearly, the optical transmission satellite downconverter 60 is also coupled to a PON optical path terminal (OLT) 28 located at the central office, one end of which is coupled to the demultiplexing multiplexer 29, and is permeable to the sub-multiplexer 29 The fiber optic cable 18 at the output of the multiplexer 29 can receive the upstream optical signal in the passive optical network (PON) and transmit the downstream optical signal in the passive optical network. The other end of the PON optical path terminal 28 is connected to the Internet 62. Therefore, the optical transmission satellite frequency reducer 60 provided by the third embodiment of the present invention has an additional function of providing a community communication network and a passive optical fiber network frame to form an optical communication network.

For example, an upstream optical signal with a λ4 wavelength in a passive optical network (PON) is transmitted from a community or home viewing terminal, through the optical cable 18 and through the split multiplexer 29, and finally by the PON central optical path terminal ( OLT) 28 receives. Conversely, the downstream optical signal of the PON central optical path terminal (OLT) 28 can be transmitted to the community or home viewing (ONU) terminal via the split multiplexer 29 and the optical cable 18 using the λ5 wavelength. Therefore, the split multiplexer 29 finally outputs an optical signal having a wavelength of λ1 + λ 2 + λ 5 to the optical cable 18 while receiving the optical signal of the λ3 + λ4 wavelength transmitted by the optical cable 18.

FIG. 7 is a schematic diagram of an optical transmission receiver according to a third embodiment of the present invention. The optical transmission receiver 70 is a receiving end corresponding to the optical transmission satellite downconverter 60 of FIG. 6, where the optical cable 18 represents an optical distribution network. The optical transmission receiver 70 receives the optical signal having the wavelength λ1+λ2+λ5 from the optical cable 18 while transmitting the optical signal having the wavelength λ3+λ4 to the optical cable 18. The optical transmission receiver 70 is substantially similar to the optical transmission receiver 50 of the second embodiment, but the difference is that the optical transmission receiver 70 further includes: a demultiplexer 71, a light emitting module 72, and a frequency division multiplexing The device 74 is coupled to a PON client (ONU) 73.

Referring to FIG. 7, the demultiplexing multiplexer 71 is similar to the demultiplexing multiplexer 31 of the second embodiment, and the demultiplexing multiplexer 71 separates the originally concentrated beams (optical signals) into λ 1 wavelengths. The optical signal, the λ 2 wavelength optical signal, and the λ 5 wavelength optical signal are output to the first light receiving module 33, the second light receiving module 35, and the PON user terminal (ONU) 73, respectively.

The frequency dividing multiplexer 36 is disposed between the first light receiving module 33 and the band pass filter 372, and is received by the first light receiving module 33 to demodulate the optical signal having the wavelength of λ 1 to a frequency of 0.047~ Electronic signal between 3.0 GHz, and crossover multiplexer 36 separates DVB-T and T-DAB signals with frequencies between 47 and 870 MHz, and vertically polarized low-band signals with frequencies between 0.95 and 1.95 GHz (VL), and electronic signals with frequencies between 1.9 and 3.0 GHz. The frequency divider multiplexer 36 outputs the electronic signal having the frequency between 1.9 and 3.0 GHz to the band pass filter 372.

The frequency dividing multiplexer 38 is disposed between the second light receiving module 35 and the band pass filter 376, and is received by the second light receiving module 35 to demodulate the optical signal having the λ 2 wavelength to a frequency of 0.047~ Electronic signals between 3.0 GHz and separated into electronic signals with frequencies below 0.95 GHz, horizontally polarized low-band signals (HL) with frequencies between 0.95 and 1.95 GHz, and electronic signals with frequencies between 1.9 and 3.0 GHz . The frequency divider multiplexer 38 outputs the electronic signal having the frequency between 1.9 and 3.0 GHz to the band pass filter 376.

The frequency dividing multiplexer 74 is connected to the light emitting module 72, an external set-top box/data modem (STB/Cable modem) 75 and a frequency dividing multiplexer 38, and the electronic signal is received by the set-top box/data machine 75, and At the same time, the receiving frequency division multiplexer 38 outputs an electronic signal below 0.95 GHz. In addition, the frequency divider multiplexer 74 outputs the electronic signal below 0.95 GHz to the set-top box/data machine 75 to receive the electronic signal to achieve the optical transmission receiver 70 (as an optical transmission network ONU) and the set-top box/data. Two-way transmission between machines 75. The frequency dividing multiplexer 74 filters the first uplink data signal output by the upper box/data machine 75, and transmits the first uplink data signal to the light emitting module 72, and the optical transmitting module 72 further uses the first uplink data signal. The optical signal having a wavelength of λ3 is modulated and transmitted to the optical cable 18 via the demultiplexing multiplexer 71. The frequency divider multiplexer 74 also converts the downlink data signal output by the frequency divider multiplexer 38 into a first downlink data signal, and outputs the first downlink data signal to the set-top box/data machine 75.

The PON client (ONU) 73 is connected to the demultiplexing multiplexer 71 and the Ethernet 76 for adjusting the second uplink data signal of the Ethernet 76 to an upstream optical signal having a wavelength of λ4 , and The split multiplexer 71 is transmitted to the optical cable 18. Meanwhile, the PON client (ONU) 73 can also demodulate the downlink optical signal with the λ5 wavelength provided by the demultiplexing multiplexer 71 into the downlink data signal of the Ethernet 76, and output the downlink data signal to the B. The network 76 is too far to achieve bidirectional transmission between the optical transmission receiver 70 (as an optical transmission network ONU) and the Ethernet 76.

Among the optical signals transmitted and received by the optical transmission receiver 70, the optical signal having the wavelength λ1 includes: a digital television (DVB-T) signal having a bandwidth of 470 to 862 MHz and/or a bandwidth of 174 to 230. MHz digital audio broadcasting (T-DAB) signals, and vertically polarized intermediate frequency signals (VH and VL) with frequencies between 0.95 and 3.0 GHz. The optical signal with λ2 wavelength includes: cable TV downlink signal (CATV forward) between 50 and 870 MHz, and horizontally polarized intermediate frequency signal (HH and HL) with frequency between 0.95 and 3.0 GHz. Optical signals with λ3 wavelengths include cable TV uplink signals (or cable TV backhaul signals, CATV Return) between 5 and 45 MHz.

FIG. 8 is a schematic diagram of an optical transmission satellite frequency reducer according to a fourth embodiment of the present invention. The optical transmission satellite frequency reducer 80 can be used as a service hub in an optical transmission network system, and can transmit a digital television signal, a digital audio signal, and a two-way wireless transmission signal through an optical transmission network. Transfer to the preset receiver. The optical transmission satellite downconverter 80 is substantially similar to the optical transmission satellite downconverter 60 of the third embodiment, except that the original frequency division multiplexer 63 is subjected to transcoding and multiplexing (frequency conversion & multiplexing). The module 81 is replaced, and the transcoding filter and multiplex module 81 is connected to an external LTE/WiMAX remote antenna 82.

The LTE/WiMAX remote antenna 82 is merely an exemplary embodiment of the present invention and is not intended to limit the present invention. The optical transmission satellite downconverter 80 can assist in transmitting downlink wireless transmission signals to corresponding wireless access points, or The uplink wireless transmission signal is transmitted to the remote antenna 82 by the wireless access point. In other embodiments, the remote antenna 82 can be adapted for use with remote antennas of other wireless communication systems, such as CDMA2000 systems, WCDMA systems, or HSPA systems.

The transcoding filter and multiplex module 81 is connected to the remote antenna 82, the frequency division multiplexer 22, and the light receiving module 27. The transcoding filter and multiplex module 81 receives an electronic signal (frequency below 950 MHz) obtained by the optical receiving module 27 from being converted (demodulated) from an optical signal having a wavelength of λ 3 , and the electronic signal is frequency-converted to an uplink. The signal is transmitted wirelessly and the uplink wireless transmission signal is transmitted to the remote antenna 82. At the same time, the frequency conversion filtering and multiplexing module 81 also receives the downlink wireless transmission signal of the remote antenna 82, and the downlink wireless transmission signal is the downlink wireless transmission intermediate frequency signal, and the downlink wireless transmission intermediate frequency signal is transmitted to the frequency division. Multiplexer 22. Then, the downlink wireless transmission intermediate frequency signal is modulated by the second light emitting module 26 to the optical signal having the λ 2 wavelength, and the optical signal having the λ 2 wavelength is output to the optical cable 18 via the split multiplexer 29.

Among the optical signals transmitted and received by the optical transmission receiver 80, the optical signal having the λ1 wavelength includes: a digital television (DVB-T) signal having a bandwidth of 470 to 862 MHz and/or a bandwidth of 174 to 230. MHz digital audio broadcasting (T-DAB) signals, and vertically polarized intermediate frequency signals (VH and VL) with frequencies between 0.95 and 3.0 GHz. Optical signals having a wavelength of λ2 include: a downlink wireless transmission intermediate frequency with a frequency below 950 MHz, and a horizontally polarized intermediate frequency signal (HH and HL) with a frequency between 0.95 and 3.0 GHz. An optical signal having a λ3 wavelength includes an uplink wireless transmission IF signal having a frequency below 950 MHz.

FIG. 9 is a schematic diagram of frequency conversion of a wireless uplink signal and a wireless downlink signal according to a fourth embodiment of the present invention. The three sub-schematic diagrams of FIG. 9 describe that the electromagnetic signals (or radio frequency signals) originally in the free space are the uplink wireless transmission signal 93 and the downlink wireless transmission signal 94, respectively, and the two wireless transmission signals may be used at frequencies. A band between 950 MHz and 3.0 GHz, such as a frequency of 2.6 GHz. When the uplink wireless transmission signal 93 and the downlink wireless transmission signal 94 are modulated to the optical signal, both the uplink wireless transmission signal 93 and the downlink wireless transmission signal 94 are down-converted into an uplink wireless transmission intermediate frequency signal 91 and a downlink wireless transmission intermediate frequency signal 92. However, the subsequent modulation is separately modulated to an optical signal having a wavelength of λ3 and a wavelength of λ2 . When the optical signal having the λ3 wavelength and the λ2 wavelength is demodulated, the demodulated uplink wireless transmission intermediate frequency signal 91 and the downlink wireless transmission intermediate frequency signal 92 need to be up-converted to the original uplink wireless transmission signal 93 and Downstream wireless transmission signal 94.

FIG. 10 is a schematic diagram of an optical transmission receiver according to a fourth embodiment of the present invention. The optical transmission receiver 100 is a receiving end corresponding to the optical transmission satellite downconverter 80 of FIG. 8, where the optical cable 18 represents the optical transmission network. The optical transmission receiver 100 receives an optical signal having a wavelength of λ1+λ2+λ5 from the optical cable 18, but transmits an optical signal having a wavelength of λ3+λ4 to the optical cable 18. The optical transmission receiver 100 is substantially similar to the optical transmission receiver 70 of the third embodiment, but the difference is that the optical transmission receiver 100 further includes: a transcoding filter and a multiplexing module 1001 connected to the frequency division multiplexer 38, And connected to an external LTE/WiMAX wireless access point 1002.

Referring to FIG. 10, the demultiplexing multiplexer 71 separates the originally concentrated light beams (optical signals) into an optical signal having a wavelength of λ 1 , an optical signal of λ 2 wavelength, and an optical signal of λ 5 wavelength, and respectively output to The first light receiving module 33, the second light receiving module 35 and the PON user terminal (ONU) 73.

The frequency-shifting filtering and multiplexing module 1001 receives the frequency-dividing multiplexer 38 by converting (demodulating) an optical signal having a wavelength of λ 2 to obtain an electronic signal having a frequency of 0.95 GHz or less. This electronic signal is a downlink wireless transmission intermediate frequency signal corresponding to the external LTE/WiMAX wireless access point 1002. Therefore, the transcoding filter and multiplex module 1001 upconverts the electronic signal to a downlink wireless transmission signal, and transmits the downlink wireless transmission signal to the LTE/WiMAX wireless access point 1002.

Similarly, the transcoding filter and multiplex module 1001 receives an uplink wireless transmission signal by the LTE/WiMAX wireless access point 1002, and the uplink uplink wireless transmission signal is an uplink wireless transmission intermediate frequency signal, and transmits the uplink wireless transmission. The frequency signal is sent to the light emitting module 72, and the uplink wireless transmission intermediate frequency signal is modulated by the light emitting module 72 to the optical signal having the λ 3 wavelength. The light emitting module 72 subsequently transmits the optical signal having a wavelength of λ 3 to the optical cable 18 via the demultiplexing multiplexer 71. Accordingly, bidirectional transmission between the optical transmission receiver 100 (as an optical transmission network ONU) and the LTE/WiMAX wireless access point 1002 is achieved.

Among the optical signals transmitted and received by the optical transmission receiver 100, the optical signal having the wavelength λ1 includes: a digital television (DVB-T) signal having a bandwidth of 470 to 862 MHz and/or a bandwidth of 174 to 230. MHz digital audio broadcasting (T-DAB) signals, and vertically polarized intermediate frequency signals (VH and VL) with frequencies between 0.95 and 3.0G Hz. Optical signals having a wavelength of λ2 include: a downlink wireless transmission intermediate frequency signal having a frequency below 950 MHz, and a horizontally polarized intermediate frequency signal (HH and HL) having a frequency between 0.95 and 3.0 GHz. An optical signal having a wavelength of λ3 includes an uplink wireless transmission intermediate frequency signal below 950 MHz.

FIG. 11 is a schematic diagram of an optical transmission satellite frequency reducer according to a fifth embodiment of the present invention. The optical transmission satellite frequency reducer 110 can be used as a service hub in an optical transmission network system, and can transmit a two-way cable television signal, an internet data signal, and a two-way wireless transmission signal through an optical transmission network. To the default receiver. The optical transmission satellite downconverter 110 is substantially similar to the optical transmission satellite downconverter 80 of the fourth embodiment, except that the optical transmission satellite downconverter 110 further includes a frequency division multiplexer 1101 connected to the frequency division multiplexing. The device 24 is connected to an external cable television network (CATV network) 61, and a frequency division multiplexer 1102 is connected between the original frequency conversion filtering and multiplexing module 81 and the light receiving module 27, and the frequency dividing multiplexer 1101 is connected. Connected to this crossover multiplexer 1102.

In FIG. 11, the LTE/WiMAX remote antenna 82 is merely an exemplary embodiment of the present invention, and is not intended to limit the present invention. The optical transmission satellite downconverter 110 can assist in transmitting a downlink wireless transmission signal to a corresponding wireless access point. Or the uplink wireless transmission signal is transmitted to the remote antenna 82 by the wireless access point. In other embodiments, the remote antenna 82 can be adapted for use with remote antennas of other wireless communication systems, such as CDMA2000 systems, WCDMA systems, or HSPA systems.

The transcoding filter and multiplex module 81 is connected to the remote antenna 82, the frequency division multiplexer 22, and the frequency division multiplexer 1102. The frequency-transmission filtering and multiplexing module 81 receives an electronic signal (frequency below 950 MHz) obtained by converting (demodulating) the optical signal having the λ 3 wavelength by the light receiving module 27 via the frequency dividing multiplexer 1102. The electronic signal is transposed into an uplink wireless transmission signal, and the uplink wireless transmission signal is transmitted to the remote antenna 82. At the same time, the frequency conversion filtering and multiplexing module 81 also receives the downlink wireless transmission signal of the remote antenna 82, and the downlink wireless transmission signal is the downlink wireless transmission intermediate frequency signal, and the downlink wireless transmission intermediate frequency signal is transmitted to the frequency division. Multiplexer 24. Then, the downlink wireless transmission intermediate frequency signal is modulated by the second light emitting module 26 to the optical signal having the λ 2 wavelength, and the optical signal having the λ 2 wavelength is output to the optical cable 18 via the split multiplexer 29.

The frequency divider multiplexer 1101 receives the cable television downlink signal (CATV Forward) of the cable television network 61, and transmits the cable television downlink signal to the frequency division multiplexer 24, and then the first light emitting module 25 modulates the same. The downlink television signal is wired to an optical signal having a λ 1 wavelength, and an optical signal having a λ 1 wavelength is output to the optical cable 18. At the same time, the light receiving module 27 converts (demodulates) the optical signal having the wavelength of λ 3 to obtain a cable television uplink signal (or CATV Return), followed by the frequency division multiplexer 1102 and the frequency division. The multiplexer 1101 transmits the cable television uplink signal to the cable television network 61. Thus, the two-way transmission between the optical transmission satellite downconverter 110 and the cable television network 61 is completed.

Among the optical signals transmitted and received by the optical transmission receiver 110, the optical signals having the λ1 wavelength include a CATV Forward with a bandwidth of 50 to 870 MHz and a vertical frequency of 0.95 to 3.0 GHz. Polarized intermediate frequency signals (VH and VL). Optical signals having a wavelength of λ2 include: a downlink wireless transmission intermediate frequency signal having a frequency below 950 MHz, and a horizontally polarized intermediate frequency signal (HH and HL) having a frequency between 0.95 and 3.0 GHz. Optical signals with λ3 wavelengths include cable TV uplink signals with frequencies between 5 and 45 MHz, and uplink wireless transmission IF signals with frequencies between 45 MHz and 950 MHz.

FIG. 12 is a schematic diagram of an optical transmission receiver according to a fifth embodiment of the present invention. The optical transmission receiver 120 is a receiving end corresponding to the optical transmission satellite downconverter 110 of FIG. 11, where the optical cable 18 represents the optical transmission network. The optical transmission receiver 120 receives the optical signal having the wavelength λ1+λ2+λ5 from the optical cable 18, but transmits the optical signal having the wavelength λ3+λ4 to the optical cable 18. The optical transmission receiver 120 is substantially similar to the optical transmission receiver 100 of the fourth embodiment, but the difference is that the optical transmission receiver 120 further includes: the frequency division multiplexer 1201 is connected to the frequency division multiplexer 36, and is in the light A frequency dividing multiplexer 1202 is connected between the transmitting module 72 and the frequency conversion filtering and multiplexing module 1001, and the frequency dividing multiplexer 1201 is connected to the frequency dividing multiplexer 1202.

Referring to FIG. 12, the demultiplexing multiplexer 71 separates the originally concentrated light beams (optical signals) into an optical signal having a wavelength of λ 1 , an optical signal of λ 2 wavelength, and an optical signal of λ 5 wavelength, and output to the respective signals. The first light receiving module 33, the second light receiving module 35 and the PON user terminal (ONU) 73.

The frequency dividing multiplexer 1201 is connected to the frequency dividing multiplexer 36, and the receiving frequency dividing multiplexer 36 converts (demodulates) the optical signal having the λ 1 wavelength to obtain a cable television downlink signal having a frequency of 47-870 MHz ( CATV Forward). The frequency division multiplexer 1201 outputs the cable television downlink signal to the community or home client to provide a digital television service. Meanwhile, the frequency division multiplexer 1201 receives a cable TV uplink signal (CATV Return) with a frequency of 5-45 MHz from the community or home client, and transmits the cable television uplink signal to the frequency division multiplexer 1202. The frequency divider multiplexer 1202 successively transmits the cable television uplink signal to the light emitting module 72 to modulate the cable television uplink signal to the optical signal having the λ 3 wavelength. The light emitting module 72 subsequently transmits the optical signal having a wavelength of λ 3 to the optical cable 18 via the demultiplexing multiplexer 71. Accordingly, bidirectional transmission between the optical transmission receiver 120 (as an optical transmission network ONU) and the community or home client is achieved.

Among the optical signals transmitted and received by the optical transmission receiver 120, the optical signals having the wavelength λ1 include: a cable television downlink signal (CATV Forward) having a bandwidth of 50 to 870 MHz, and a vertical frequency of 0.95 to 3.0 GHz. Polarized intermediate frequency signals (VH and VL). Optical signals having a wavelength of λ2 include: a downlink wireless transmission intermediate frequency signal having a frequency below 950 MHz, and a horizontally polarized intermediate frequency signal (HH and HL) having a frequency between 0.95 and 3.0 GHz. Optical signals with λ3 wavelengths include: CATV Return with a bandwidth between 5 and 45 MHz, and an uplink wireless transmission IF with a frequency below 950 MHz.

FIG. 13 is a schematic diagram of an optical transmission satellite frequency reducer according to a sixth embodiment of the present invention. The optical transmission satellite frequency reducer 130 can serve as a service center in an optical transmission network system, and can transmit digital wireless signals, two-way cable television signals, internet data signals, and two-way wireless transmission signals through an optical transmission network. To the default receiver. The optical transmission satellite downconverter 130 is substantially similar to the optical transmission satellite downconverter 80 of the fourth embodiment, except that the split multiplexer 29 is coupled to an optical transmission network of an external cable television network. The network utilizes an optical signal having a wavelength of λ6 + λ7 to transmit or receive a bidirectional optical signal of a cable television network (or CATV optical network) 64.

In FIG. 13, the splitter multiplexer 29 receives a cable television downstream optical signal (CATV Forward) from the cable television optical network 64. The cable downstream optical signal has a wavelength of λ6 and is output to the optical cable 18. At the same time, the split multiplexer 29 receives the cable TV upstream optical signal (CATV Return) having the λ7 wavelength from the optical cable 18, and transmits the cable television upstream optical signal to the external cable television optical network 64. Thus, the two-way transmission between the optical transmission satellite downconverter 130 and the external cable television optical network 64 is completed.

Among the optical signals transmitted and received by the optical transmission receiver 130, the optical signal having the wavelength λ1 includes: a digital television (DVB-T) signal having a bandwidth of 470 to 862 MHz and/or a bandwidth of 174~ A 230 MHz digital audio broadcast (T-DAB) signal and a vertically polarized IF signal (VH and VL) with a frequency between 0.95 and 3.0 GHz. Optical signals having a wavelength of λ2 include: a downlink wireless transmission intermediate frequency with a frequency below 950 MHz, and a horizontally polarized intermediate frequency signal (HH and HL) with a frequency between 0.95 and 3.0 GHz. An optical signal having a λ3 wavelength includes an uplink wireless transmission IF signal having a frequency below 950 MHz.

FIG. 14 is a schematic diagram of an optical transmission receiver according to a sixth embodiment of the present invention. The optical transmission receiver 140 is a receiving end corresponding to the optical transmission satellite downconverter 130 of FIG. 13, where the optical cable 18 represents the optical transmission network. The optical transmission receiver 140 receives an optical signal having a wavelength of λ1 + λ2 + λ5 + λ6 from the optical cable 18, but transmits an optical signal having a wavelength of λ3 + λ4 + λ7 to the optical cable 18. The optical transmission receiver 140 is substantially similar to the optical transmission receiver 100 of the fourth embodiment, but the difference is that the optical transmission receiver 140 further includes: a cable television optical transmission network subscriber (CATV ONU) 1401 connected to the solution The multiplexer 71 is connected to an external cable television two-way communication network.

Referring to FIG. 14, the demultiplexing multiplexer 71 separates the originally concentrated light beams (optical signals) into an optical signal having a λ 1 wavelength, an optical signal of a λ 2 wavelength, an optical signal of a λ 5 wavelength, and a λ 6 wavelength. The optical signals are output to the first optical receiving module 33, the second optical receiving module 35, the PON subscriber end (ONU) 73, and the cable television optical transmission network subscriber end (CATV ONU) 1401, respectively.

The cable television optical transmission network client (CATV ONU) 1401, the receiving demultiplexing multiplexer 71 outputs an optical signal having a λ 6 wavelength demodulated to a cable television downlink signal (CATV Forward) having a frequency between 47 and 1002 MHz. The Cable TV Optical Transport Network Client (CATV ONU) 1401 outputs this cable television signal to a community or home client to provide digital TV multi-system services. At the same time, the cable TV optical transmission network client (CATV ONU) 1401 receives a cable TV uplink signal (CATV Return) with a frequency between 5 and 45 MHz from the community or home client, and modulates the cable television uplink signal to have The optical signal of the λ 7 wavelength is then output to the optical cable 18 via the demultiplexing multiplexer 71 with an optical signal having a wavelength of λ 7 . In this way, a two-way transmission between the optical transmission receiver 140 (as an optical transmission network ONU) and the community or home client is achieved.

Among the optical signals transmitted and received by the optical transmission receiver 140, the optical signal having the wavelength λ1 includes: a digital television (DVB-T) signal having a bandwidth of 470 to 862 MHz and/or a bandwidth of 174 to 230. MHz digital audio broadcasting (T-DAB) signals, and vertically polarized intermediate frequency signals (VH and VL) with frequencies between 0.95 and 3.0 GHz. Optical signals having a wavelength of λ2 include: a downlink wireless transmission intermediate frequency signal having a frequency below 950 MHz, and a horizontally polarized intermediate frequency signal (HH and HL) having a frequency between 0.95 and 3.0 GHz. An optical signal having a wavelength of λ3 includes an uplink wireless transmission intermediate frequency signal below 950 MHz.

In summary, according to an exemplary embodiment of the present invention, an optical transmission satellite downconverter and its optical transmission receiver are proposed. The proposed optical transmission satellite frequency reducer changes the processing method of the satellite polarized intermediate frequency signal, and has two light emitting modules, which respectively use the laser light signals of different wavelengths to be down-converted to the horizontal poles of the same frequency range. The intermediate frequency signal and the vertically polarized intermediate frequency signal are respectively modulated to change optical signals of different wavelengths. Then, a beam splitter is condensed into a light beam, and the same cable connected to the output end is transmitted to the remote receiving end, and then photoelectrically converted into the original by the light receiving module of the receiving end (optical transmission receiver). Horizontally polarized IF signal and vertically polarized IF signal. In this way, the signal attenuation and distortion caused by long-distance transmission will be greatly reduced. At the same time, it can also broadcast one or two sets of multimedia signals with bandwidths ranging from 5 to 900 MHz at any time, with satellite TV, digital TV, digital audio broadcasting, two-way cable TV uplink and downlink signals, two-way wireless communication signals or It can be used to link passive fiber optic networks and pass them on to community or home clients to provide multimedia services.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

10, 20, 40, 80, 110, 130. . . Optical transmission satellite frequency reducer

11, 21. . . Waveguide probe

13,23. . . Down-conversion filter circuit

131, 135, 232, 236. . . Low noise amplifier

132, 233, 235, 237, 239, 372, 374, 375, 376, 378, 379. . . Bandpass filter

133, 137, 234, 238, 373, 377. . . Mixer

134, 138, 231, 371. . . Dielectric oscillator

15. . . Diplexer

16. . . Amplifier

17, 72. . . Light emitting module

18. . . Optical cable

18-1, 18-2. . . Light path

19, 27. . . Light receiving module

20. . . Optical transmission satellite frequency reducer

22, 24, 63, 36, 38, 74, 1101, 1102, 1201, 1202. . . Crossover multiplexer

25. . . First light emitting module

26. . . Second light emitting module

28. . . Passive fiber optic network optical path terminal

29. . . Split-wave multiplexer

30, 50, 70, 100, 120, 140. . . Optical transmission receiver

31, 71. . . Demultiplexing multiplexer

33. . . First light receiving module

35. . . Second light receiving module

37. . . Satellite signal four-band output down-conversion filter circuit

61. . . Cable television network

62. . . Internet

64. . . Cable television optical network

73. . . Passive fiber network client

75. . . External set-top box/data machine

76. . . Ethernet

81. . . Frequency conversion filtering and multiplex module

82. . . LTE/WiMAX remote antenna

91. . . Uplink wireless transmission IF signal

92. . . Downlink wireless transmission IF signal

93. . . Uplink wireless transmission signal

94. . . Downlink wireless transmission signal

1001. . . Frequency conversion filtering and multiplex module

1002. . . LTE/WiMAX wireless access point

1401. . . Cable TV optical transmission network client

S1. . . Satellite signal (HH, HL, VH, VL)

S4. . . Digital TV signal

S5. . . Digital audio broadcast signal

S6. . . Cable TV downlink signal

S7. . . Ground microwave signal (digital TV signal and digital audio signal)

S8. . . Cable TV downlink signal

λ 1, λ 2, λ 3, λ 4, λ 5, λ 6, λ 7. . . wavelength

1 is a schematic diagram of the structure of an optical transmission satellite frequency reducer and a flow chart for processing satellite television signals.

2 is a schematic diagram of an optical transmission satellite downconverter and a flowchart thereof for processing a satellite television signal according to a first embodiment of the present invention.

3 is a schematic diagram of an optical transmission satellite downconverter and a corresponding receiver according to a first embodiment of the present invention.

4 is a schematic diagram of an optical transmission satellite downconverter and a flowchart thereof for processing satellite television signals according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram of an optical transmission satellite downconverter and a corresponding receiver according to a second embodiment of the present invention.

6 is a schematic diagram of an optical transmission satellite downconverter and a flowchart thereof for processing satellite television signals according to a third embodiment of the present invention.

FIG. 7 is a schematic diagram of an optical transmission receiver according to a third embodiment of the present invention.

FIG. 8 is a schematic diagram of an optical transmission satellite frequency reducer according to a fourth embodiment of the present invention.

FIG. 9 is a schematic diagram of frequency conversion of a wireless uplink signal and a wireless downlink signal according to a fourth embodiment of the present invention.

FIG. 10 is a schematic diagram of an optical transmission receiver according to a fourth embodiment of the present invention.

FIG. 11 is a schematic diagram of an optical transmission satellite frequency reducer according to a fifth embodiment of the present invention.

FIG. 12 is a schematic diagram of an optical transmission receiver according to a fifth embodiment of the present invention.

FIG. 13 is a schematic diagram of an optical transmission satellite frequency reducer according to a sixth embodiment of the present invention.

FIG. 14 is a schematic diagram of an optical transmission receiver according to a sixth embodiment of the present invention.

18. . . Optical cable

18-1, 18-2. . . Light path

20. . . Optical transmission satellite frequency reducer

twenty one. . . Waveguide probe

twenty three. . . Down-conversion filter circuit

231. . . Dielectric oscillator

232, 236. . . Low noise amplifier

233, 235, 237, 239. . . Bandpass filter

234, 238. . . Mixer

25. . . First light emitting module

26. . . Second light emitting module

29. . . Split-wave multiplexer

S1. . . Satellite signal (HH, HL, VH, VL)

λ 1, λ 2. . . wavelength

Claims (17)

An optical transmission satellite frequency reducer comprising: a waveguide probe for receiving four polarized radio frequency signals transmitted by a satellite transponder; and a down-conversion filtering circuit connected to the waveguide probe for The RF horizontally polarized signal and the vertically polarized signal received by the waveguide probe are respectively down-converted into a horizontally polarized intermediate frequency signal and a vertically polarized intermediate frequency signal in the same frequency range; a first light emitting module is connected And the down-converting filter circuit is configured to emit a laser light or a light-emitting diode light source of a first wavelength, and transform the vertically-polarized intermediate frequency signal into an optical signal having a first wavelength; and a second light emission a module connected to the down-converting filter circuit for emitting a laser light or a light-emitting diode light source of a second wavelength different from the first wavelength, and converting the horizontally-polarized intermediate frequency signal to have a second a wavelength optical signal; and a wavelength division multiplexer coupled to the first light emitting module and the second light emitting module for receiving and concentrating the optical signal having the first wavelength and the having The second wavelength of the light signal is a beam of light. The output light beam to a fiber optic cable. The optical transmission satellite frequency reducer according to claim 1, further comprising: a first frequency division multiplexer disposed between the frequency reduction filter circuit and the first light emission module, Receiving the vertically polarized intermediate frequency signal and the input multimedia signal. The optical transmission satellite frequency reducer according to claim 1, further comprising: a first frequency division multiplexer disposed between the frequency reduction filter circuit and the second light emission module, Receiving the horizontally polarized intermediate frequency signal and the input multimedia signal. The optical transmission satellite frequency reducer according to claim 2, wherein the multimedia signal comprises: a two-way cable television downlink signal, a digital television signal, a digital audio signal, and a wireless transmission. Signal, or any combination of the various signals previously described. The optical transmission satellite frequency reducer according to claim 2 or 3, further comprising: a second frequency divider multiplexer connected to the first frequency divider multiplexer and an external cable television network a light receiving module connected between the splitting multiplexer and the second frequency dividing multiplexer for receiving an optical signal having a third wavelength, wherein the optical signal having the third wavelength Includes a cable TV upstream optical signal with a frequency between 5 and 50 MHz. The optical transmission satellite frequency reducer according to claim 5, further comprising: a passive optical network optical path terminal connected to the demultiplexing multiplexer for receiving an uplink optical signal or transmitting a downlink optical signal The upstream optical signal has a fourth wavelength and the downstream optical signal has a fifth wavelength. The optical transmission satellite frequency reducer according to claim 3, further comprising: an optical receiving module connected to the demultiplexing multiplexer for receiving the third wavelength from the demultiplexing multiplexer An optical signal, and demodulating an uplink wireless transmission intermediate frequency signal of the optical signal having the third wavelength; and a transcoding filter and a multiplexing module connected to the optical receiving module, the first sub a frequency multiplexer and an external remote antenna, configured to receive the uplink wireless transmission intermediate frequency signal from the optical receiving module, receive a downlink wireless transmission signal from the external remote antenna, and transpose the uplink wireless The transmission intermediate frequency signal is an uplink wireless transmission signal, and the downlink wireless transmission signal is a downlink wireless transmission intermediate frequency signal, and the uplink wireless transmission signal is output to the external remote antenna, and the downlink wireless transmission intermediate frequency is output. Signaling to the first frequency divider multiplexer. The optical transmission satellite frequency reducer according to claim 1, further comprising: a first frequency division multiplexer disposed between the frequency reduction filter circuit and the first light emission module, Receiving the vertically polarized intermediate frequency signal and the input multimedia signal; a second frequency divider multiplexer disposed between the down conversion filter circuit and the second light emitting module for receiving the a horizontally polarized intermediate frequency signal and an input multimedia signal; and a third frequency divider multiplexer coupled to the first frequency divider multiplexer and an external cable television network for use from the external cable television network Receiving a cable television downlink signal, and transmitting, by the first frequency divider multiplexer, the cable television downlink signal to the first optical transmission module, wherein the first optical transmission module will be the wired The television downlink signal and the vertically polarized intermediate frequency signal are modulated into the optical signal having the first wavelength. The optical transmission satellite frequency reducer of claim 8, further comprising: a light receiving module connected to the splitting multiplexer for receiving a third wavelength from the splitting multiplexer An optical signal, and demodulating an uplink wireless transmission intermediate frequency signal and a cable television uplink signal of the optical signal having the third wavelength; and a fourth frequency divider multiplexer connected to the third frequency division multiplexing And the optical receiving module, configured to receive, by the optical receiving module, the uplink wireless transmission intermediate frequency signal and the cable television uplink signal, and output by the third frequency divider multiplexer a cable television uplink signal to the cable television network; and a transcoding filter and multiplexing module connected to the second frequency division multiplexer, the fourth frequency division multiplexer and an external remote antenna The uplink wireless transmission intermediate frequency signal is received from the optical receiving module via a fourth frequency divider multiplexer, and the uplink wireless transmission intermediate frequency signal is transposed to an uplink wireless transmission signal, and the uplink wireless transmission is output. Signaling to the external remote antenna; and said The transcoding filter and the multiplex module further receive a downlink wireless transmission signal from the external remote antenna, transpose the downlink wireless transmission signal into a downlink wireless transmission intermediate frequency signal, and output the downlink wireless transmission intermediate frequency signal to the The second frequency divider multiplexer is described. The optical transmission satellite frequency reducer according to claim 6, wherein: the wavelength division multiplexer is further connected to a cable television two-way optical communication network for receiving a cable television downlink signal from the cable television optical network. The cable television downlink signal is an optical signal having a sixth wavelength; and the wavelength division multiplexer further receives an optical signal having a seventh wavelength from the optical cable, wherein the optical signal having the seventh wavelength is a cable television And uplinking the cable television uplink signal to the cable television two-way optical communication network. An optical transmission receiver comprising: a demultiplexing multiplexer for receiving a light beam by an optical cable and separating the optical beam into an optical signal having at least a first wavelength and an optical signal having a second wavelength; The optical receiving module is connected to the demultiplexing multiplexer for receiving and converting the optical signal having the first wavelength into a vertically polarized intermediate frequency signal and a multimedia intermediate frequency signal; and a second optical receiving module, Connected to the demultiplexing multiplexer for receiving and converting the optical signal having the second wavelength into a horizontally polarized intermediate frequency signal and a multimedia intermediate frequency signal; and a down conversion filter circuit connected to the first The light receiving module and the second light receiving module are configured to respectively filter the vertically polarized intermediate frequency signal and the horizontally polarized intermediate frequency signal, and output four polarized RF signals. The optical transmission receiver of claim 11, wherein the down-conversion filter circuit further comprises: a first frequency divider multiplexer connected to the first light receiving module for filtering The multimedia intermediate frequency signal received by the first optical receiving module is a digital wireless television signal and a digital audio broadcasting signal; and a second frequency dividing multiplexer is connected to the second optical receiving module for filtering The multimedia intermediate frequency signal received from the second optical receiving module is a cable television downlink signal. The optical transmission receiver of claim 11, further comprising: the demultiplexing multiplexer separating the light beam into an optical signal having a first wavelength, an optical signal having a second wavelength, and having a third a wavelength optical signal; a first frequency divider multiplexer connected to the first light receiving module, configured to filter the multimedia intermediate frequency signal received from the first light receiving module into a digital television signal and a digital audio broadcast signal; a second frequency divider multiplexer connected to the second light receiving module, configured to filter the multimedia intermediate frequency signal received from the second light receiving module into a cable television downlink signal The cable television downlink signal includes a broadcast television signal and a data signal; a passive optical network client connected to the demultiplexing multiplexer and an external data network for receiving the third a wavelength optical signal, demodulating the optical signal having the third wavelength as a first downlink data signal and outputting the first downlink data signal to the external data network; and using the passive optical network And receiving a first uplink data signal of the external data network, modulating the first uplink data signal into an optical signal having a fourth wavelength, and transmitting, by using the demultiplexing multiplexer, the A four-wavelength optical signal is applied to the cable. The optical transmission receiver of claim 13, further comprising: a third frequency divider multiplexer connected to the second frequency divider multiplexer and an external data machine for filtering the broadcast a television signal and the data signal, and outputting the broadcast television signal and the data signal to the external set-top box, and for filtering a second uplink data signal output by the external set-top box; and a light emission a module connected to the third frequency divider multiplexer and the demultiplexing multiplexer for modulating the uplink data signal to an optical signal having a fifth wavelength, and transmitting the fifth wavelength An optical signal is sent to the cable. The optical transmission receiver of claim 13, further comprising: a frequency conversion filtering and multiplexing module connected to the second frequency dividing multiplexer and an external wireless access point for receiving The downlink wirelessly transmits an intermediate frequency signal, and converts the downlink wireless transmission intermediate frequency signal into a downlink wireless transmission signal, and outputs the downlink wireless transmission signal to the external wireless access point; the frequency transcoding filter and the The working module further receives an uplink wireless transmission signal from the external wireless access point, and converts the uplink wireless transmission signal into an uplink wireless transmission intermediate frequency signal; and an optical transmission module connected to the transcoding filter And the multiplexer module and the demultiplexing multiplexer, configured to modulate the uplink wireless transmission intermediate frequency signal to an optical signal having a fifth wavelength, and transmit the optical signal having the fifth wavelength to the optical cable . The optical transmission receiver of claim 11, further comprising: a first frequency divider multiplexer connected to the first light receiving module for filtering the output of the first light receiving module The multimedia intermediate frequency signal is a cable television downlink signal; a second frequency divider multiplexer is connected to the second light receiving module, and is configured to filter the multimedia intermediate frequency signal output by the second light receiving module to a downlink wireless transmission intermediate frequency signal; a third frequency divider multiplexer connected to the first frequency divider multiplexer and an external cable television network for outputting the cable television downlink signal to the external a cable television network, and receiving a cable television uplink signal of the external cable television network; and a frequency conversion filtering and multiplexing module connected to the second frequency divider multiplexer and an external wireless access point, And configured to receive the downlink wireless transmission intermediate frequency signal, and convert the downlink wireless transmission intermediate frequency signal into a downlink wireless transmission signal, and output the downlink wireless transmission signal to the external wireless access point; Filtering and multiplexing module Receiving an uplink wireless transmission signal from the external wireless access point, and converting the uplink wireless transmission signal into an uplink wireless transmission intermediate frequency signal; and a fourth frequency division multiplexer connected to the third frequency division multiple The device and the transcoding filter and multiplex module are configured to output the uplink wireless transmission intermediate frequency signal and the cable television uplink signal; and an optical transmission module connected to the fourth frequency division multiplexer And the demultiplexing multiplexer, configured to modulate the uplink wireless transmission intermediate frequency signal and the cable television uplink signal to an optical signal having a third wavelength, and transmit the optical signal having the third wavelength to the Said cable. The optical transmission receiver of claim 15, wherein: the demultiplexing multiplexer separates the light beam into an optical signal having a first wavelength, an optical signal having a second wavelength, and having a third wavelength An optical signal and an optical signal having a fourth wavelength; a cable television optical transmission network client connected to the demultiplexing multiplexer and an external cable television two-way communication network for receiving and demodulating the fourth The optical signal of the wavelength is a cable television downlink signal, and the cable television downlink signal is outputted to the external cable television two-way communication network; and the cable television optical transmission network user terminal further receives from the external cable television two-way communication network a cable television uplink signal, and modulating the cable television uplink signal into an optical signal having a fifth wavelength, outputting the optical signal having the fifth wavelength to the demultiplexing multiplexer; and the demultiplexing multiplexing Transmitting the optical signal having the fifth wavelength to the optical cable.