CN102255659B - Optical low-noise block downconverter, multi-dwelling unit equipment and related satellite television system - Google Patents
Optical low-noise block downconverter, multi-dwelling unit equipment and related satellite television system Download PDFInfo
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Abstract
The invention discloses an optical low-noise block downconverter, multi-dwelling unit equipment and a related satellite television system. The optical low-noise block downconverter comprises a first downconversion circuit, a second downconversion circuit, an oscillator, a first light emitter and a second light emitter, wherein the first downconversion circuit is used for performing downconversion and filtering processing on a first polarized signal input into the optical low-noise block downconverter to output a first intermediate frequency signal; the second downconversion circuit is used for performing the downconversion and filtering processing on a second polarized signal input into the optical low-noise block downconverter to output a second intermediate frequency signal; frequency bands of the first and second intermediate frequency signals are the same; the oscillator is coupled to the first and second downconversion circuits, and is used for generating an oscillation signal and outputting the oscillation signal to the first and second downconversion circuits; the first light emitter is coupled to the first downconversion circuit, and is used for converting the first intermediate frequency signal into a first optical signal; and the second light emitter is coupled to the second downconversion circuit, and is used for converting the second intermediate frequency signal into a second optical signal. The optical low-noise block downconverter, the multi-dwelling unit equipment and the related satellite television system reduce the cost.
Description
Technical field
The present invention relates to a kind of optics lnb (Optical Low-Noise Block Downconverter), many housing units equipment and relative satellite television system, espespecially one optics lnb, many housing units equipment and related satellite communication system cheaply.
Background technology
It is vast and be not subject to the advantages such as ground environment interference that satellite communication has coverage, with the purposes of satellite television broadcasting, can make user view and admire various channel program and enjoy high image quality.Please refer to Fig. 1, Fig. 1 is the schematic diagram of a known satellite TV system 10.Satellite TV system 10 is that a satellite television is shared antenna system (Satellite Master AntennaTelevision), be applicable in mansion or community, each user can pass through shared antenna reception satellite-signal, as Ku frequency band (10.7～12.75GHz) satellite-signal.In satellite TV system 10, one satellite receiver 100 receiving satellite signals frequency reducing are 0.95～2.15GHz intermediate-freuqncy signal, be sent to the decoding device 104 of multiple clients by a multi-breal switch (Multiswitch) 102 if Set Top Box (Set Top Box) is to decode, make all users in community view and admire different satellite television programmings by playing device 106 (as TV).In addition, terrestrial television broadcast signal is received by an antenna 108, is sent to client by multi-breal switch 102.
Please refer to Fig. 2, Fig. 2 is the schematic diagram of a known satellite TV system 20.Satellite TV system 20 can receive the satellite-signal that multiple satellites transmit simultaneously, and uses Optical Fiber Transmission.In satellite receiver 200_1～200_N, each satellite receiver receives respectively the satellite-signal that different satellites are launched, after satellite-signal frequency reducing is intermediate-freuqncy signal, be converted to again light signal, be sent to a headend (Headend Equipment) 202 with fiber optic cables and carry out signal processing, as signal demodulation and smear.The signal that headend 202 is exported exports housing unit more than (Multiple Dwelling Unit) equipment 206 to by a distributor (Splitter) 204.The headend 202 at the most signal transmssion line between housing unit equipment 206 is also fiber optic cables.Many housing units equipment 206 comprises dozens of output port, is arranged at user density Gao mansion or community.Many housing units equipment 206 is converted to light signal the signal of telecommunication and carries out the signal processing such as frequency reducing, to produce the signal that can be received for the decoding device of client 208.For convenience of description, in Fig. 2 only to distributor 204, many housing units equipment 206 and decoding device 208 labels, in fact as shown in Figure 2, headend 202 can be connected to multiple distributors, and each distributor can connect multiple many housing units equipment, and many housing units equipment can connect the decoding device of multiple clients.
In satellite TV system 20, in order to coordinate optical fiber transmission property, in wave collecting device, must use optics lnb (Optical LNB), many housing units equipment 206 also must coordinate Optical Fiber Transmission and design.Please refer to Fig. 3, Fig. 3 is the schematic diagram of a known optics lnb 30, and it is take universal lnb (Universal LNB) standard as example.In optics lnb 30, the band pass filter 302 that perpendicular polarization signal SV is 10.7～12.75GHz by a low noise amplifier 300 and passband (Passband), then the 9.75GHz oscillator signal producing by a frequency mixer 304 and an oscillator 306 carries out mixing, a band pass filter 308 that is finally 0.95～3GHz by passband and an intermediate frequency amplifier 310, output one intermediate-freuqncy signal IF1.The band pass filter 314 that horizontal polarization signal SH is 10.7～12.75GHz by a low noise amplifier 312 and passband, then the 7.3GHz oscillator signal producing by a frequency mixer 316 and an oscillator 318 carries out mixing, a band pass filter 320 that is finally 3.4～5.45GHz by passband and an intermediate frequency amplifier 322, output one intermediate-freuqncy signal IF2.Intermediate-freuqncy signal IF1, IF2 are converted to light signal by an optical transmitting set (OpticalTransmitter) 324, to pass through Optical Fiber Transmission.As from the foregoing, optics lnb 30 is opened up the vertical and horizontal polarization signal of input frequency domain and is transmitted on different frequency bands.
Please refer to Fig. 4, Fig. 4 is the schematic diagram of the known equipment of housing unit more than one 40.Many housing units equipment 40 can be the many housing units equipment 206 in satellite TV system 20.In many housing units equipment 40, the light signal of inputting by fiber optic cables is converted to the signal of telecommunication via an optical receiver (Optical Receiver) 400, exports an intermediate frequency amplifier 402 to.The output signal of intermediate frequency amplifier 402, respectively by band pass filter 406,408, produces intermediate-freuqncy signal IF3, the IF4 of different frequency bands.Intermediate-freuqncy signal IF3 is respectively by the circuit in two different paths, carry out signal amplification, mixing and filtering processing, produce a low-frequency band perpendicular polarization signal VL and a high frequency band perpendicular polarization signal VH, intermediate-freuqncy signal IF4 is also respectively by two different paths, produce a low-frequency band horizontal polarization signal HL and a high frequency band horizontal polarization signal HH, above-mentioned level and perpendicular polarization signal export the decoding device of client to by a multi-breal switch 410.
The free transmission range of the filter that Fig. 4 indicates is corresponding to the optics lnb 30 of Fig. 3.In order to carry out down conversion process, many housing units equipment 40 must use oscillator 412,414 to produce 0.85GHz and 3.3GHz oscillator signal, and uses frequency mixer 416 mixing to produce 2.45GHz oscillator signal.In addition, many housing units equipment 40 must use filters 418,420,422 between oscillator signal, to interfere with each other avoiding.As shown in Figure 4, in order to realize Optical Fiber Transmission, the composition assembly of many housing units equipment 40 is quite a lot of.
Can change the signal of telecommunication of extremely high frequency 5.45GHz in order to make optical transmitting set 324 in optics lnb 30, the cost of the laser diode (Laser Diode) in optical transmitting set 324 is the three to four-fold of the laser diode of common specification on market, and the cost of the photo-detector (Photodetector) in the optical receiver 400 of many housing units equipment 40 is also the several times of the photo-detector of common specification.In addition, the intermediate frequency amplifier 322 in lnb 30 must can be enlarged into 3.4～5.45GHz intermediate-freuqncy signal, and its assembly cost is the several times of general common intermediate frequency amplifier.In general, the satellite TV system costliness of the more traditional use coaxial cable of cost of the satellite TV system 20 of use Optical Fiber Transmission is many.
Therefore, need to provide one optics lnb, many housing units equipment and relative satellite television system cheaply.
Summary of the invention
Therefore, main purpose of the present invention is to provide one optics lnb, many housing units equipment and relative satellite television system cheaply.
The present invention discloses a kind of optics lnb, and this optics lnb includes one first frequency down circuit, is used for one first polarized signal of inputting this optics lnb to carry out frequency reducing and filtering processing, to export one first intermediate-freuqncy signal; One second frequency down circuit, is used for one second polarized signal of inputting this optics lnb to carry out frequency reducing and filtering processing, and to export one second intermediate-freuqncy signal, this first intermediate-freuqncy signal is identical with the frequency band of this second intermediate-freuqncy signal; One oscillator, is coupled to this first frequency down circuit and this second frequency down circuit, is used for producing an oscillator signal, exports this first frequency down circuit and this second frequency down circuit to; One first optical transmitting set, is coupled to this first frequency down circuit, is used for this first intermediate-freuqncy signal to be converted to one first light signal; And one second optical transmitting set, be coupled to this second frequency down circuit, be used for this second intermediate-freuqncy signal to be converted to one second light signal.
This first light signal and this second light signal can be transmitted by different optical fiber respectively, or being incorporated into same optical fiber transmits.
The present invention separately discloses a kind of many housing units equipment for a satellite TV system, and this many housing units equipment includes one first optical receiver, is used for one first light signal of this many housing units equipment of input to be converted to one first intermediate-freuqncy signal; One second optical receiver, is used for one second light signal of this many housing units equipment of input to be converted to one second intermediate-freuqncy signal, and the frequency band of this second intermediate-freuqncy signal is identical with the frequency band of this first intermediate-freuqncy signal; One first amplifier, is coupled to this first optical receiver, is used for amplifying this first intermediate-freuqncy signal; One second amplifier, is coupled to this second optical receiver, is used for amplifying this second intermediate-freuqncy signal; One first frequency down circuit, is coupled to this first amplifier, is used for this first intermediate-freuqncy signal to carry out filtering and down conversion process, to export one the 3rd intermediate-freuqncy signal; One second frequency down circuit, is coupled to this first amplifier, is used for this first intermediate-freuqncy signal to carry out filtering and down conversion process, and to export one the 4th intermediate-freuqncy signal, wherein the frequency band of the 4th intermediate-freuqncy signal is higher than the frequency band of the 3rd intermediate-freuqncy signal; One the 3rd frequency down circuit, is coupled to this second amplifier, is used for this second intermediate-freuqncy signal to carry out filtering and down conversion process, to export one the 5th intermediate-freuqncy signal; One the 4th frequency down circuit, is coupled to this second amplifier, is used for this second intermediate-freuqncy signal to carry out filtering and down conversion process, and to export one the 6th intermediate-freuqncy signal, wherein the frequency band of the 6th intermediate-freuqncy signal is lower than the frequency band of the 5th intermediate-freuqncy signal; One oscillator, is coupled to this second frequency down circuit and the 3rd frequency down circuit, is used for producing an oscillator signal, exports this second frequency down circuit and the 3rd frequency down circuit to; And a multi-breal switch, be coupled to this first, this second, the 3rd and the 4th frequency down circuit, be used for the 3rd, the 4th, the 5th and the 6th intermediate-freuqncy signal to be passed to the client of this satellite TV system.
The present invention separately discloses a kind of satellite TV system, this satellite TV system includes multiple satellite receiver, a distributor and multiple many housing units equipment, each satellite receiver includes an optics lnb, this optics lnb includes one first frequency down circuit, be used for one first polarized signal of inputting this optics lnb to carry out frequency reducing and filtering processing, to export one first intermediate-freuqncy signal; One second frequency down circuit, is used for one second polarized signal of inputting this optics lnb to carry out frequency reducing and filtering processing, and to export one second intermediate-freuqncy signal, this first intermediate-freuqncy signal is identical with the frequency band of this second intermediate-freuqncy signal; One oscillator, is coupled to this first frequency down circuit and this second frequency down circuit, is used for producing an oscillator signal, exports this first frequency down circuit and this second frequency down circuit to; One first optical transmitting set, is coupled to this first frequency down circuit, is used for this first intermediate-freuqncy signal to be converted to one first light signal; And one second optical transmitting set, be coupled to this second frequency down circuit, be used for this second intermediate-freuqncy signal to be converted to one second light signal; This distributor is coupled to the plurality of satellite receiver, is used for transmitting this first light signal and this second light signal that each satellite receiver in the plurality of satellite receiver is exported; Each many housing units devices, coupled is in a client terminal device of this distributor and this satellite TV system, this first light signal and this second light signal that are used for each satellite receiver in the plurality of satellite receiver to export carry out photosignal conversion, frequency reducing and filtering processing, can be by the signal that this client terminal device was received to produce.
Photoelectric subassembly in optics lnb of the present invention and many housing units equipment and intermediate frequency amplifier can use the assembly of common specification, to reduce costs, reduced the cost of the satellite TV system that uses optics lnb of the present invention and many housing units equipment simultaneously.
Accompanying drawing explanation
Fig. 1 and Fig. 2 are the schematic diagram of known satellite TV system.
Fig. 3 is the schematic diagram of a known optics lnb.
Fig. 4 is the schematic diagram of the known equipment of housing unit more than.
Fig. 5 and Fig. 6 are the schematic diagram of the optics lnb of the embodiment of the present invention.
Fig. 7 is the schematic diagram of a satellite TV system of the embodiment of the present invention.
Fig. 8 is the schematic diagram of the equipment of housing unit more than of the embodiment of the present invention.
Fig. 9 is the schematic diagram of a satellite TV system of the embodiment of the present invention.
Figure 10 is the schematic diagram of the equipment of housing unit more than of the embodiment of the present invention.
Primary clustering symbol description:
10,20,70,90 satellite TV systems 306,318,412,414,504,
100,200_1～200_N, 700_1～700_N 604,816,138 oscillators
900_1～900_N satellite receiver 310,322,402,518,528,804,806,126,
102,410,818,140 multi-breal switch 128 intermediate frequency amplifiers
104,208 decoding device 324,506,508,606,608 optical transmitting sets
106 playing device 400,800,802,122,124 optical receivers
108 antenna 418,420,422 filters
110 dish-like reflectings surface 500,502,600,602,808,810
112 wave collecting device 812,814,130,132,134,136 frequency reducing electricity
120 channel-splitting filter roads
202 headend 62,902 wave multiplexers
204,702,904 distributor 72 fiber optic cables
206,40,80,12,704_1～704_M IF1, IF2, IF3, IF4, E1P, E2P intermediate frequency letter
Many housing units of 906_1～906_M device number
30,50,60 optics lnb O1, O2, O3, O4, OC, O1P, O2P, O3P,
300,312,510,520 low noise amplifier O4P light signals
302,308,314,320,406,408,512, LO, LO2, LO3 oscillator signal
516,522,526,820,822,826,828, SV, VH, VL perpendicular polarization signal
832,834 band pass filter SH, HH, HL horizontal polarization signal
304,316,416,514,524,824,830 L1, L2, L3 optical fiber
Frequency mixer
Embodiment
Please refer to Fig. 5, the schematic diagram of the optics lnb 50 that Fig. 5 is the embodiment of the present invention.Optics lnb 50 is used for input signal orthogonal two polarised directions, as vertical and horizontal polarization signal, carrying out down conversion process and being converted to light signal, is applicable in the satellite TV system of Optical Fiber Transmission.The optics lnb 50 of Fig. 5 is example according to the conventional universal lnb standard of European Region.
In frequency down circuit 500, low noise amplifier 510 is used for amplifying perpendicular polarization signal SV, and band pass filter 512 is coupled to low noise amplifier 510, and the signal that is used for the passband of 10.7～12.75GHz, low noise amplifier 510 being exported carries out filtering processing.The passband of band pass filter 512 is the frequency band of the satellite TV signal of wish reception, is Ku frequency band as an example of Fig. 5 example.Frequency mixer 514 is coupled to band pass filter 512 and oscillator 504, and the signal and the oscillator signal LO that are used for band pass filter 512 to export carry out mixing, that is down conversion process.Band pass filter 516 is coupled to frequency mixer 514, and the signal that is used for the passband of 0.95～3.0GHz, frequency mixer 514 being exported carries out filtering processing.Intermediate frequency amplifier 518 is coupled to band pass filter 516, is used for amplifying the signal that band pass filter 516 is exported, and produces intermediate-freuqncy signal IF1.Intermediate-freuqncy signal IF1 is converted to light signal O1 by optical transmitting set 506.
The working method of frequency down circuit 502 is similar to frequency down circuit 500, wherein low noise amplifier 520 is used for amplifying horizontal polarization signal SH, band pass filter 522 is coupled to low noise amplifier 520, and the signal that is used for the passband of 10.7～12.75GHz, low noise amplifier 520 being exported carries out filtering processing.Frequency mixer 524 is coupled to band pass filter 522 and oscillator 504, and the signal and the oscillator signal LO that are used for band pass filter 522 to export carry out mixing.Band pass filter 526 is coupled to frequency mixer 524, and the intermediate-freuqncy signal that is used for the passband of 0.95～3.0GHz, frequency mixer 524 being exported is carried out filtering processing.Intermediate frequency amplifier 528 is coupled to band pass filter 526, is used for amplifying the signal that band pass filter 526 is exported, and produces intermediate-freuqncy signal IF2.Intermediate-freuqncy signal IF2 is converted to light signal O2 by optical transmitting set 508.
In the known optics lnb 30 of Fig. 3, use two oscillators that the oscillator signal of different frequency is provided, vertical and horizontal polarization signal are downconverted to respectively to different frequency band (0.95～3.0GHz and 3.4～5.45GHz), and optics lnb 50 of the present invention only uses an oscillator, vertical and horizontal polarization signal are all downconverted to identical frequency band (0.95～3.0GHz).Significantly, the present invention has saved quantity and the cost of the oscillator of optics lnb 50.In addition, in known optics lnb 30, intermediate frequency amplifier 322 must be 3.4～5.45GHz intermediate frequency amplifier, and the intermediate frequency amplifier of this specification is not Common Component and the cost costliness of lnb on the market; Under comparing, because optics lnb 50 of the present invention is 0.95～3.0GHz intermediate-freuqncy signal by vertical and horizontal polarization signal down, optics lnb 50 can use on the market common and more cheap 0.95～3.0GHz intermediate frequency amplifier as intermediate frequency amplifier 518,528, can effectively reduce costs.
The optical transmitting set 324 of known optics lnb 30 must can be changed the high frequency 5.45GHz signal of telecommunication, therefore optical transmitting set 324 cannot use the laser diode of common Optical Fiber Transmission specification OC-48 (transmission rate 2.488Gbps), must use the higher laser diode of transmission rate, cost costliness.Relatively, the frequency band of intermediate-freuqncy signal IF1, IF2 in optics lnb 50 of the present invention is that the laser diode of 0.95～3GHz and OC-48 specification can be supported transmission rate 3Gbps nearly, and therefore optical transmitting set 506,508 can use the laser diode of OC-48 specification.Although optical transmitting set of the present invention 506,508 must use two laser diodes, its cost still cost of the optical transmitting set 324 of more known optics lnb 30 is lower, has more economic benefit.
In brief, the focusing on of the optics lnb of the embodiment of the present invention only used an oscillator to produce oscillator signal, two orthogonal polarised direction polarized signals are downconverted to same frequency band simultaneously, make optical transmitting set can adopt the assembly of common optical fiber transmission standard, significantly to reduce costs.
Please note, passband and the oscillation signal frequency of the polarized signal type of input optics lnb 50, the band pass filter of optics lnb 50, be to be example according to universal lnb standard, but optics lnb 50 is not to use universal lnb standard to be limited.Optics lnb 50 also can design according to other lnb standards, and corresponding band pass filter and the component characteristic of oscillator are adjusted according to standard is different.The polarized signal that optics lnb 50 receives is the vertical and horizontal polarization signal of linearly polarized not necessarily, also can be the left-handed and right-hand polarization signal of circularly polarized.Frequency down circuit 500 and frequency down circuit 502 are the embodiment of the present invention, in other embodiments of the invention, and the assembly in frequency down circuit, as band pass filter or low noise amplifier etc., visual performance requirements is done necessary quantity increase and decrease or module position and is changed.
In Fig. 5, light signal O1, the O2 that optics lnb 50 is exported transfers to back-end device (as the headend of satellite TV system) by optical fiber L1, L2 respectively, and the transmission channel of each light signal is independent separately.Hence one can see that, and optics lnb 50 is mode output optical signal O1, O2s multiplexing with shunting, and whether identical the wavelength of light signal O1, O2 is, and the signal that can not affect back-end device receives.Connect optics lnb 50 and must comprise at least two optical fiber with the fiber optic cables of back-end device.
Please refer to Fig. 6, the schematic diagram of the optics lnb 60 that Fig. 6 is the embodiment of the present invention.Optics lnb 60 includes frequency down circuit 600,602, an oscillator 604 and optical transmitting set 606,608.The work of frequency down circuit 600,602 and oscillator 604 and the wherein annexation of assembly, identical with assembly corresponding in Fig. 5, please refer to aforementioned optics lnb 50, be not repeated herein, the assembly that frequency down circuit 600,602 comprises also omits label in Fig. 6.Optical transmitting set 606,608 is respectively coupled to frequency down circuit 600,602, the wavelength of the laser diode in optical transmitting set 606 is different from the wavelength of the laser diode in optical transmitting set 608, is converted to wavelength different light signal O3, O4 in order to the intermediate-freuqncy signal IF3, the IF4 that respectively frequency down circuit 600,602 are exported.As from the foregoing, optics lnb 60 is with wavelength division multiplexing (Wavelength Division Multiplexing, WDM) but not the multiplexing output optical signal in shunting, this is optics lnb 60 and the difference of optics lnb 50.In Fig. 6, optical transmitting set 606,608 is separately coupled to a wave multiplexer (wavelength division multiplexer) (Wavelength Division Multiplexer) 62, wave multiplexer 62 is used for different wavelength light signal O3, O4 to be combined into a light signal OC, to transmit on an optical fiber L3.Therefore, in the fiber optic cables of connection optics lnb 60 and back-end device, comprise an optical fiber enough.
Optics lnb 50 and optics lnb 60 can be applicable to receive the satellite TV system of many satellite-signals, or antenna system as shared in the satellite television of Fig. 1.Please refer to Fig. 7, the schematic diagram of the satellite TV system 70 that Fig. 7 is the embodiment of the present invention.Satellite TV system 70 uses the multiplexing Optical Fiber Transmission framework in shunting, include satellite receiver 700_1～700_N, a distributor 702 and many housing units equipment 704_1～704_M, wherein each satellite receiver is used optics lnb 50 to carry out satellite-signal down conversion process and electro-optical signal conversion.
In satellite receiver 700_1～700_N, two light signals of each satellite receiver output, total 2N light signal transfers to distributor 702 by fiber optic cables 72, and fiber optic cables 72 comprise at least 2N bar optical fiber.Distributor 702 has 2N input port and 2N × M output port, be used for 2N light signal to be passed to M each housing unit equipment in many housing units equipment 704_1～704_M, each many housing units equipment is used for 2N the light signal receiving to carry out photosignal conversion, amplification, frequency reducing and filtering processing, the signal that the decoding device of the applicable client of generation receives.Please note, Fig. 7 is intended to describe satellite TV system 70 and receives the satellite-signal of multiple satellites, and transmit corresponding light signal with shunting multiplexer mode, in fact, terrestrial television broadcast signal or digital broadcast signal also can be converted into light signal, with being transmitted by fiber optic cables, these certain applications are not in category of the present invention, therefore do not describe in detail with the corresponding light signal of satellite-signal.
The circuit characteristic of many housing units equipment 704_1～704_M, as the frequency of the passband of filter or oscillator etc., must corresponding optics lnb 50 and design.Please refer to Fig. 8, the schematic diagram of the equipment of housing unit more than one 80 that Fig. 8 is the embodiment of the present invention, many housing units equipment 80 can be used to realize the many housing units equipment in the satellite TV system 70 of Fig. 7, uses with 50 collocation of optics lnb.Many housing units equipment 80 includes optical receiver 800,802, intermediate frequency amplifier 804,806, frequency down circuit 808,810,812,814, an oscillator 816 and a multi-breal switch 818.Take many housing units equipment 80 for satellite TV system 70 as example, optical receiver 800,802 is used for respectively receiving optical signals O1P, O2P, an its satellite receiver 700_1～700_N wherein satellite receiver exports and is transmitted by distributor 702, and optical receiver 800,802 is converted to intermediate-freuqncy signal E1P, E2P by light signal O1P, O2P respectively.Intermediate frequency amplifier 804,806 is respectively coupled to optical receiver 800,802, is used for amplifying intermediate-freuqncy signal E1P, E2P.The signal that frequency down circuit 808,810,812,814 is used for that intermediate frequency amplifier 804,806 is exported carries out frequency reducing and filtering processing, to produce the signal that decoding device was received that is suitably for client, describe in detail as after.Oscillator 816 is used for producing an oscillator signal LO2, and frequency is 0.85GHz, for frequency down circuit 810,812.
Frequency down circuit 808 includes a band pass filter 820, is coupled to intermediate frequency amplifier 804, and the signal that is used for the passband of 0.95～1.95GHz, intermediate frequency amplifier 804 being exported carries out filtering processing, output one low-frequency band perpendicular polarization signal VL.Frequency down circuit 810 includes a band pass filter 822, a frequency mixer 824 and a band pass filter 826.Band pass filter 822 is coupled to intermediate frequency amplifier 804, and the signal that is used for the passband of 1.95～3GHz, intermediate frequency amplifier 804 being exported carries out filtering processing.Frequency mixer 824 is coupled to band pass filter 822 and oscillator 816, and the signal and the oscillator signal LO2 that are used for band pass filter 822 to export carry out mixing, that is down conversion process.Band pass filter 826 is coupled to frequency mixer 824, and the signal that is used for the passband of 1.1～2.15GHz, frequency mixer 824 being exported carries out filtering processing, output one high frequency band perpendicular polarization signal VH.
The similar frequency down circuit 810 of frequency down circuit 812, includes a band pass filter 828, a frequency mixer 830 and a band pass filter 832.Band pass filter 828 is coupled to intermediate frequency amplifier 806, and the signal that is used for the passband of 1.95～3GHz, intermediate frequency amplifier 806 being exported carries out filtering processing.Frequency mixer 830 is coupled to band pass filter 828 and oscillator 816, and the signal and the oscillator signal LO2 that are used for band pass filter 828 to export carry out mixing, that is down conversion process.Band pass filter 832 is coupled to frequency mixer 830, and the signal that is used for the passband of 1.1～2.15GHz, frequency mixer 830 being exported carries out filtering processing, output one high frequency band horizontal polarization signal HH.Frequency down circuit 814 includes a band pass filter 834, is coupled to intermediate frequency amplifier 806, and the signal that is used for the passband of 0.95～1.95GHz, intermediate frequency amplifier 806 being exported carries out filtering processing, output one low-frequency band horizontal polarization signal HL.Multi-breal switch 818 is coupled to frequency down circuit 808,810,812,814, is used for vertical and horizontal polarization signal VL, VH, HH, the HL of above-mentioned different frequency bands to be passed to the client decoding device of many housing units equipment end after 80s, for example Set Top Box.Note that the assembly that in Fig. 8, frequency down circuit 808,810,812,814 comprises is embodiments of the invention, those of ordinary skills should do different variations and modification according to this, as component count increase and decrease or position change etc.
It is noted that, many housing units equipment 80 is used for processing two signals that single satellite receiver transmits, if with the satellite TV system of multiple satellite receiver, many housing units equipment wherein equals multiple many housing units equipment 80 and forms.Take Fig. 7 as example, because satellite TV system 70 comprises N satellite receiver, therefore each many housing units equipment in many housing units equipment 704_1～704_M, is equivalent to many housing units equipment that N many housing units equipment 80 forms.
As shown in Figure 4, light signal only inputs to known many housing units equipment 40 with single optical fiber channel, many housing units equipment 40 need to be compared with multi-filter to carry out down conversion process by the segmentation of 0.95～5.45GHz intermediate-freuqncy signal, need two oscillators and a frequency mixer to produce the oscillator signal of three different frequencies, with by the intermediate-freuqncy signal frequency reducing of different frequency bands simultaneously.Relatively, because many housing units equipment 80 of the present invention and 50 collocation of optics lnb are used for satellite TV system, light signal is to transfer to many housing units equipment 80 with shunting multiplexer mode, and the signal band that each fiber channel transmits is lower, is 0.95～3GHz.Therefore, only to need an oscillator can be decoding device receivable signal in rear end by intermediate-freuqncy signal frequency reducing to many housing units equipment 80 of the present invention.Comparison diagram 4 is known with Fig. 8, the oscillator of many housing units equipment 80 of the present invention and filter quantity are significantly less than known many housing units equipment 40, except the cost of many housing units equipment 80 is more saved, also contribute to reduce the cost of satellite TV system.
Please refer to Fig. 9, the schematic diagram of the satellite TV system 90 that Fig. 9 is the embodiment of the present invention.Satellite TV system 90 uses the Optical Fiber Transmission framework of wavelength division multiplexing, include satellite receiver 900_1～900_N, a wave multiplexer 902, a distributor 904 and many housing units equipment 906_1～906_M, wherein each satellite receiver is used as the optics lnb 60 of Fig. 6 carries out satellite-signal down conversion process and electro-optical signal is changed.In satellite receiver 900_1～900_N, two light signals that wavelength is different of each satellite receiver output, satellite receiver 900_1～900_N exports the different light signal of 2N wavelength altogether to wave multiplexer 902.2N light signal is combined into a light signal OC by wave multiplexer 902, to transmit on single optical fiber.Distributor 904 has an input port and M output port, is used for light signal OC to be passed to each the many housing units equipment in many housing units equipment 906_1～906_M.Each many housing units equipment is used for light signal OC to carry out photosignal conversion, frequency reducing, amplification and filtering processing, the vertical and horizontal polarization signal of the different frequency bands that the decoding device of the applicable client of generation receives.
Please refer to Figure 10, the schematic diagram of the equipment of housing unit more than one 12 that Figure 10 is the embodiment of the present invention, many housing units equipment 12 can be used as many housing units equipment of the satellite TV system 90 of Fig. 9, uses with optics lnb 60 collocation of Fig. 6.Many housing units equipment 12 includes a channel-splitting filter (Wave decomposing multiplexer) (Wavelength DivisionDemultiplexer) 120, optical receiver 122,124, intermediate frequency amplifier 126,128, frequency down circuit 130,132,134,136, an oscillator 138 and a multi-breal switch 140.Take many housing units equipment 12 for satellite TV system 90 as example, the light signal OC that channel-splitting filter 120 is used for that wave multiplexer 902 is exported is separated into light signal O3P, the O4P of different wave length.Optical receiver 122,124 is coupled to channel-splitting filter 120, is used for respectively light signal O3P, O4P being converted to intermediate-freuqncy signal.Intermediate frequency amplifier 126,128 is respectively coupled to optical receiver 122,124, is used for amplifying respectively the intermediate-freuqncy signal that optical receiver 122,124 is exported.The assembly that frequency down circuit 130,132,134,136 comprises and working method are identical with the frequency down circuit 808,810,812,814 of many housing units equipment 80 of Fig. 8, omit label in Fig. 8.Oscillator 138 is used for producing an oscillator signal LO3, and frequency is 0.85GHz, for frequency down circuit 132,134.
In many housing units equipment 12, the circuit unit after channel-splitting filter 120 and unit class corresponding in many housing units equipment 80 seemingly, are not repeated herein.Be similar to many housing units equipment 80, many housing units equipment 12 also has framework to be simplified and advantage cheaply, contributes to reduce the cost of satellite TV system.
In sum, the optics lnb of the embodiment of the present invention uses single oscillator to carry out the processing of frequency reducing signal, has simplified in known optics lnb complicated framework, and with shunting multiplexing or wavelength division multiplexed mode transmitting optical signal; Accordingly, many housing units of embodiment of the present invention equipment also uses single oscillator to carry out the processing of frequency reducing signal.Therefore, photoelectric subassembly in optics lnb and many housing units equipment and intermediate frequency amplifier can use the assembly of common specification, to reduce costs, reduced the cost that uses the optics lnb of the embodiment of the present invention and the satellite TV system of many housing units equipment simultaneously.
The foregoing is only preferred embodiment of the present invention, every equalization of doing according to the scope of the claims in the present invention book changes and modifies, and all should belong to covering scope of the present invention.
Claims (16)
1. an optics lnb, comprising:
One first frequency down circuit, is used for one first polarized signal of inputting this optics lnb to carry out frequency reducing and filtering processing, to export one first intermediate-freuqncy signal;
One second frequency down circuit, is used for one second polarized signal of inputting this optics lnb to carry out frequency reducing and filtering processing, and to export one second intermediate-freuqncy signal, this first intermediate-freuqncy signal is identical with the frequency band of this second intermediate-freuqncy signal;
One oscillator, is coupled to this first frequency down circuit and this second frequency down circuit, is used for producing an oscillator signal, exports this first frequency down circuit and this second frequency down circuit to;
One first optical transmitting set, is coupled to this first frequency down circuit, is used for this first intermediate-freuqncy signal to be converted to one first light signal; And
One second optical transmitting set, is coupled to this second frequency down circuit, is used for this second intermediate-freuqncy signal to be converted to one second light signal;
Wherein, wherein this first frequency down circuit comprises:
One first amplifier, is used for amplifying this first polarized signal;
One first band pass filter, is coupled to this first amplifier, and the signal that is used for one first passband, this first amplifier being exported carries out filtering processing;
One frequency mixer, is coupled to this first band pass filter and this oscillator, and the signal and this oscillator signal that are used for this first band pass filter to export carry out mixing;
One second band pass filter, is coupled to this frequency mixer, and the signal that is used for one second passband, this frequency mixer being exported carries out filtering processing; And
One second amplifier, is coupled to this second band pass filter, is used for amplifying the signal that this second band pass filter is exported, and exports this first optical transmitting set to.
2. optics lnb as claimed in claim 1, wherein this first light signal and this second light signal transmit by different optical fiber respectively.
3. optics lnb as claimed in claim 1, wherein this first optical transmitting set and this second optical transmitting set are separately coupled to a wave multiplexer, this wave multiplexer is used for this first light signal and this second light signal to be combined into one the 3rd light signal, to transmit by an optical fiber.
4. optics lnb as claimed in claim 1, wherein this second frequency down circuit comprises:
One first amplifier, is used for amplifying this second polarized signal;
One first band pass filter, is coupled to this first amplifier, and the signal that is used for one first passband, this first amplifier being exported carries out filtering processing;
One frequency mixer, is coupled to this first band pass filter and this oscillator, and the signal and this oscillator signal that are used for this first band pass filter to export carry out mixing;
One second band pass filter, is coupled to this frequency mixer, and the signal that is used for one second passband, this frequency mixer being exported carries out filtering processing; And
One second amplifier, is coupled to this second band pass filter, is used for amplifying the signal that this second band pass filter is exported, and exports this second optical transmitting set to.
5. for many housing units equipment of a satellite TV system, comprising:
One first optical receiver, is used for one first light signal of this many housing units equipment of input to be converted to one first intermediate-freuqncy signal;
One second optical receiver, is used for one second light signal of this many housing units equipment of input to be converted to one second intermediate-freuqncy signal, and the frequency band of this second intermediate-freuqncy signal is identical with the frequency band of this first intermediate-freuqncy signal;
One first amplifier, is coupled to this first optical receiver, is used for amplifying this first intermediate-freuqncy signal;
One second amplifier, is coupled to this second optical receiver, is used for amplifying this second intermediate-freuqncy signal;
One first frequency down circuit, is coupled to this first amplifier, is used for this first intermediate-freuqncy signal to carry out filtering and down conversion process, to export one the 3rd intermediate-freuqncy signal;
One second frequency down circuit, is coupled to this first amplifier, is used for this first intermediate-freuqncy signal to carry out filtering and down conversion process, and to export one the 4th intermediate-freuqncy signal, wherein the frequency band of the 4th intermediate-freuqncy signal is higher than the frequency band of the 3rd intermediate-freuqncy signal;
One the 3rd frequency down circuit, is coupled to this second amplifier, is used for this second intermediate-freuqncy signal to carry out filtering and down conversion process, to export one the 5th intermediate-freuqncy signal;
One the 4th frequency down circuit, is coupled to this second amplifier, is used for this second intermediate-freuqncy signal to carry out filtering and down conversion process, and to export one the 6th intermediate-freuqncy signal, wherein the frequency band of the 6th intermediate-freuqncy signal is lower than the frequency band of the 5th intermediate-freuqncy signal;
One oscillator, is coupled to this second frequency down circuit and the 3rd frequency down circuit, is used for producing an oscillator signal, exports this second frequency down circuit and the 3rd frequency down circuit to; And
One multi-breal switch, be coupled to this first, this second, the 3rd and the 4th frequency down circuit, be used for the 3rd, the 4th, the 5th and the 6th intermediate-freuqncy signal to be passed to the client of this satellite TV system.
6. many housing units equipment as claimed in claim 5, wherein this first light signal and this second light signal, respectively by different optical fiber, transfer to this first optical receiver and this second optical receiver.
7. many housing units equipment as claimed in claim 5, wherein the wavelength of the wavelength of this first light signal and this second light signal is different.
8. many housing units equipment as claimed in claim 7, wherein this first light signal and this second optical signals one channel-splitting filter export this first optical receiver and this second optical receiver to, this channel-splitting filter is coupled to this first optical receiver and this second optical receiver, is used for one the 3rd light signal to be split up into this first light signal and this second light signal.
9. many housing units equipment as claimed in claim 5, wherein this first frequency down circuit comprises a band pass filter, be coupled to this first amplifier, the signal that is used for one first passband, this first amplifier being exported carries out filtering processing, to export the 3rd intermediate-freuqncy signal.
10. many housing units equipment as claimed in claim 5, wherein this second frequency down circuit comprises:
One first band pass filter, is coupled to this first amplifier, and the signal that is used for one first passband, this first amplifier being exported carries out filtering processing;
One frequency mixer, is coupled to this first band pass filter and this oscillator, and the signal and this oscillator signal that are used for this first band pass filter to export carry out mixing; And
One second band pass filter, is coupled to this frequency mixer, and the signal that is used for one second passband, this frequency mixer being exported carries out filtering processing, to export the 4th intermediate-freuqncy signal.
11. many housing units equipment as claimed in claim 5, wherein the 3rd frequency down circuit comprises:
One first band pass filter, is coupled to this second amplifier, and the signal that is used for one first passband, this second amplifier being exported carries out filtering processing;
One frequency mixer, is coupled to this first band pass filter and this oscillator, and the signal and this oscillator signal that are used for this first band pass filter to export carry out mixing; And
One second band pass filter, is coupled to this frequency mixer, and the signal that is used for one second passband, this frequency mixer being exported carries out filtering processing, to export the 5th intermediate-freuqncy signal.
12. many housing units equipment as claimed in claim 5, wherein the 4th frequency down circuit comprises a band pass filter, be coupled to this second amplifier, the signal that is used for one first passband, this second amplifier being exported carries out filtering processing, to export the 6th intermediate-freuqncy signal.
13. 1 kinds of satellite TV systems, comprising:
Multiple satellite receiver, each satellite receiver comprises an optics lnb, this optics lnb comprises:
One first frequency down circuit, is used for one first polarized signal of inputting this optics lnb to carry out frequency reducing and filtering processing, to export one first intermediate-freuqncy signal;
One second frequency down circuit, is used for one second polarized signal of inputting this optics lnb to carry out frequency reducing and filtering processing, and to export one second intermediate-freuqncy signal, this first intermediate-freuqncy signal is identical with the frequency band of this second intermediate-freuqncy signal;
One oscillator, is coupled to this first frequency down circuit and this second frequency down circuit, is used for producing an oscillator signal, exports this first frequency down circuit and this second frequency down circuit to;
One first optical transmitting set, is coupled to this first frequency down circuit, is used for this first intermediate-freuqncy signal to be converted to one first light signal; And
One second optical transmitting set, is coupled to this second frequency down circuit, is used for this second intermediate-freuqncy signal to be converted to one second light signal;
One distributor, is coupled to the plurality of satellite receiver, is used for transmitting this first light signal and this second light signal that each satellite receiver in the plurality of satellite receiver is exported; And
Multiple many housing units equipment, each many housing units devices, coupled is in a client terminal device of this distributor and this satellite TV system, this first light signal and this second light signal that are used for each satellite receiver in the plurality of satellite receiver to export carry out photosignal conversion, frequency reducing and filtering processing, can be by the signal that this client terminal device was received to produce.
14. satellite TV systems as claimed in claim 13, this first light signal and this second light signal that wherein this each satellite receiver is exported transmit by different optical fiber respectively.
15. satellite TV systems as claimed in claim 13, wherein this first optical transmitting set of this optics lnb and this second optical transmitting set are separately coupled to a wave multiplexer, this wave multiplexer is used for this first light signal and this second light signal to be combined into one the 3rd light signal, to transmit by an optical fiber.
16. satellite TV systems as claimed in claim 15, wherein this each many housing units equipment comprises a channel-splitting filter, is used for the 3rd light signal to be split up into this first light signal and this second light signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010173750.0A CN102255659B (en) | 2010-05-17 | 2010-05-17 | Optical low-noise block downconverter, multi-dwelling unit equipment and related satellite television system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010173750.0A CN102255659B (en) | 2010-05-17 | 2010-05-17 | Optical low-noise block downconverter, multi-dwelling unit equipment and related satellite television system |
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| CN102255659A CN102255659A (en) | 2011-11-23 |
| CN102255659B true CN102255659B (en) | 2014-06-11 |
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| CN201010173750.0A Active CN102255659B (en) | 2010-05-17 | 2010-05-17 | Optical low-noise block downconverter, multi-dwelling unit equipment and related satellite television system |
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| CN103715989B (en) * | 2012-09-29 | 2016-06-22 | 启碁科技股份有限公司 | Optical fiber low-noise frequency and satellite TV system |
| CN107438168B (en) * | 2016-05-25 | 2020-06-16 | 宏观微电子股份有限公司 | Signal processing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101218751A (en) * | 2005-05-10 | 2008-07-09 | 高通股份有限公司 | Systems, methods, and apparatus for frequency control |
| CN101432976A (en) * | 2006-04-24 | 2009-05-13 | 松下电器产业株式会社 | Receiving device, electronic device using the same, and receiving method |
| WO2009067464A1 (en) * | 2007-11-20 | 2009-05-28 | Qualcomm Incorporated | Adjustable local oscillator path in a communication device with a transmitter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101218751A (en) * | 2005-05-10 | 2008-07-09 | 高通股份有限公司 | Systems, methods, and apparatus for frequency control |
| CN101432976A (en) * | 2006-04-24 | 2009-05-13 | 松下电器产业株式会社 | Receiving device, electronic device using the same, and receiving method |
| WO2009067464A1 (en) * | 2007-11-20 | 2009-05-28 | Qualcomm Incorporated | Adjustable local oscillator path in a communication device with a transmitter |
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