CN203554455U - Fiber-to-the-home type optical receiver - Google Patents
Fiber-to-the-home type optical receiver Download PDFInfo
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- CN203554455U CN203554455U CN201320720477.8U CN201320720477U CN203554455U CN 203554455 U CN203554455 U CN 203554455U CN 201320720477 U CN201320720477 U CN 201320720477U CN 203554455 U CN203554455 U CN 203554455U
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- optical receiver
- power supply
- amplification module
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Abstract
Disclosed in the utility model is a fiber-to-the-home type optical receiver comprising an optical fiber connected with a front end. The improvement of the fiber-to-the-home type optical receiver is characterized in that the optical receiver also includes an optical receiver element, a pre-stage amplification module, an attenuator, a post-stage amplification module, a power injection device, and a radio frequency output connector, wherein the optical receiver element, the pre-stage amplification module, the attenuator, the post-stage amplification module, the power injection device, and the radio frequency output connector are successively in signal connection. The optical fiber that is in signal connection to the optical receiver element transmits a broadcast television downlink optical signal to the optical receiver element; the optical receiver element converts the optical signal into a radio frequency signal; the signal is amplified by the pre-stage amplification module; the attenuator carries out controlling to adjust the signal level; secondary amplification is carried out by the post-stage amplification module; and the processed signal passes through the power injection device and the radio frequency output connector outputs the signal to the user. According to the scheme, the two-stage amplification radio frequency circuit is used and the interstage attenuator is arranged, so that the output level can be adjusted and thus the television watching effect can be improved; moreover, the optical receiver can be used conveniently.
Description
Technical field
The utility model relates to optical receiver, specifically, is a kind of fiber entering household type optical receiver that is provided with note electrical equipment for hfc plant.
Background technology
Fiber entering household type optical receiver is HFC(Hybrid Fiber-Coaxial, i.e. hybrid fiber coax) visual plant of light signal in Internet Transmission/radiofrequency signal conversion, is used for television network broadcast fiber entering household type Solutiion of Building of Network.In the epoch of the integration of three networks, television network broadcast, in order to be at war with other operators, first be need to strengthen the advantage of oneself: be exactly program source, particularly have abundant high-definition program source.But although there is high-definition program source, if network capacity does not reach the requirement of digital TV in high resolution signal transmission, effect equally can be had a greatly reduced quality.Traditional hfc plant standard coaxial cable part is very long, general also minimum mode that need to cascade dual-stage amplifier enters in user family by branch distributor again after optical receiver or optical workstation is transmitted, signal, through repeatedly processing and add that multistage splicing loss is larger, can not meet the transmission requirement of digital TV in high resolution signal.
For this problem, the transformation of television network broadcast is carried out, generally all take two modes to carry out: one, built old town network using to be made the mode of FTTC to into Fiber-To-The-Building head, can reduce dual-stage amplifier like this, directly by the laggard access customer man of branch distributor, effect is relatively good, but owing to still will passing through longer coaxial cable and branch distributor, still has the problem of loss of signal; Two, the New-deployed Network of newly built city district is all adopted to fiber-to-the-home mode, directly optical fiber is routed in user family, then by fiber entering household type optical receiver, converting radiofrequency signal to watches for user, greatly reduced the length of coaxial cable, add and do not need through branch distributor, the loss of digital TV in high resolution signal is dropped to very little, user can reach the extraordinary effect of watching, really experiences the huge difference in digital TV in high resolution and ordinary numbers electricity apparent resolution.
Along with the continuous propelling of China's urbanization, fiber entering household type optical receiver is the huge market having, but fiber entering household type optical receiver in the market exists the deficiency of several respects:
Because current fiber entering household type optical receiver product is all generally that after converting light signal to radiofrequency signal, direct single-stage is amplified rear output, attenuator is not set, cannot regulation output level value, running into output level value cannot adjust when too high or too low, affect television set and watch effect, use inconvenient.
What fiber entering household type optical receiver all adopted is the mode of powering by external power supply adapter, and power supply adaptor provides a DC power supply to use to opto-electronic conversion and radio frequency amplifying circuit by an independent supply socket.And power supply adaptor is a Switching Power Supply in essence, itself can produce low-frequency noise signal and then be superimposed upon on opto-electronic conversion and radio frequency amplifying circuit, affects the indexs such as carrier-to-noise ratio of radio frequency output signal, causes watching that effect declines.
Utility model content
The purpose of this utility model is in order to provide a kind of employing two-stage to amplify, can use attenuator to adjust output level value, can filter out power low-frequency noise signal, be applicable to the fiber entering household type optical receiver of hfc plant.
The technical scheme that the utility model solution prior art problem adopts is: it comprises the optical fiber being connected with front end, and its improvement is: also comprise signal connects successively light receiving element, prime amplification module, attenuator, rear class amplification module, note electrical equipment and radio frequency out splice going splice; Described fiber-optic signal is connected in described light receiving element, radio and television downlink optical signal is sent to light receiving element, light receiving element converts light signal to radiofrequency signal, through prime amplification module, signal is amplified, then by attenuator, control the level height of adjusting signal, enter rear class amplification module and carry out secondary amplification, by note electrical equipment, through radio frequency out splice going splice, output signal to user.
Below above technical scheme is further elaborated:
Further, also comprise that power module and is in order to convert the power supply of described power module input to the power supply adaptor of DC power supply, described power supply adaptor converts the power supply of input after DC power supply to, by a DC power supply input port, is connected with described note electrical equipment.
Further, described note electrical equipment by power supply conversion, produce low-frequency noise target signal filter after offer described light receiving element, prime amplification module and rear class amplification module and use, to avoid the low-frequency noise of described power supply adaptor to be added to, affect the carrier-to-noise ratio index of signal in radiofrequency signal.
Further, described power module is electric network source.
The beneficial effects of the utility model are:
One, the radio circuit that fiber entering household type optical receiver of the present utility model adopts two-stage to amplify, is provided with inter-stage attenuator, can adjust the height of output level, thereby can promote television set, watches effect, and easy to use.
They are two years old, fiber entering household type optical receiver of the present utility model is provided with note electrical equipment, and the DC power supply that power supply adaptor provides is introduced into note electrical equipment, and low-frequency power low-frequency noise signal is carried out to filtering, guarantee that radiofrequency signal is not affected, improved the indexs such as carrier-to-noise ratio of product.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of fiber entering household type optical receiver in the utility model embodiment;
In figure: optical fiber 1; Light receiving element 2; Prime amplification module 3; Attenuator 4; Rear class amplification module 5; Note electrical equipment 6; Radio frequency out splice going splice 7; DC power supply input port 8; Power supply adaptor 9.
The realization of the utility model object, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Below with reference to drawings and the specific embodiments, describe the technical solution of the utility model in detail, so as clearer, understand invention essence of the present utility model intuitively.
The utility model provides a kind of fiber entering household type optical receiver that is applicable to hfc plant.HFC is the abbreviation of Hybrid Fiber-Coaxial, i.e. hybrid fiber coax.It is a kind of economical and practical integrated digital service broadband networks access technology.HFC is comprised of fiber optic backbone, coaxial cable branch line and subscriber distribution network network three parts conventionally, first becomes light signal transmit at main line from cable TV station's programme signal out; Behind user area, light signal is converted to the signal of telecommunication, after distributor distributes, by coaxial cable, deliver to user.
Fiber entering household type optical receiver is the visual plant of light signal in hfc plant transmission/radiofrequency signal conversion, for television network broadcast fiber entering household type Solutiion of Building of Network, uses.Below just for the deficiencies in the prior art, specific embodiment of the utility model is proposed:
Shown in Fig. 1, the fiber entering household type optical receiver of the present embodiment comprises light receiving element 2, prime amplification module 3, attenuator 4, rear class amplification module 5, note electrical equipment 6 and radio frequency out splice going splice 7, and described light receiving element 2, prime amplification module 3, attenuator 4, rear class amplification module 5, note electrical equipment 6 and radio frequency out splice going splice 7 successively signal connect; For ease of understanding the utility model, the working procedure of the present embodiment is as follows: the optical fiber being connected with front end 1 signal is connected in described light receiving element 2, radio and television downlink optical signal is sent to light receiving element 2, light receiving element 2 converts light signal to radiofrequency signal, through 3 pairs of signals of prime amplification module, amplify, then by attenuator 4, control the level height of adjusting signal, enter rear class amplification module 5 and carry out secondary amplification, by note electrical equipment 6, through radio frequency out splice going splice 7, output signal to user.
Simultaneously, the present embodiment also comprises that electric network source module and is in order to convert the power supply of described power module input to the power supply adaptor 9 of DC power supply, described power supply adaptor 9 converts the electric network source of input after DC power supply to, by a DC power supply input port 8, is connected with described note electrical equipment 6.Then electric energy being offered to light receiving element 2, prime amplification module 3 and rear class amplification module 5 uses.
Specifically, electric network source access power supply adaptor 9 converts to after DC power supply, through DC power supply input port 8, be connected with above-mentioned note electrical equipment 6, note electrical equipment 6 by power supply conversion, produce low-frequency noise target signal filter after offer light receiving element 2, prime amplification module 3 and rear class amplification module 5 and use, the low-frequency noise of guaranteeing power supply adaptor 9 can not be added to affects the indexs such as carrier-to-noise ratio of signal in radiofrequency signal.
In sum, the radio circuit that fiber entering household type optical receiver of the present utility model adopts two-stage to amplify, is provided with inter-stage attenuator 4, can adjust the height of output level, thereby can promote television set, watches effect, and easy to use; Meanwhile, the utility model is provided with note electrical equipment 6, and the DC power supply that power supply adaptor 9 provides is introduced into note electrical equipment 6, and low-frequency power low-frequency noise signal is carried out to filtering, guarantees that radiofrequency signal is not affected, and has improved the indexs such as carrier-to-noise ratio of product.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (4)
1. a fiber entering household type optical receiver, be applicable to hfc plant, it comprises the optical fiber being connected with front end, it is characterized in that: also comprise signal connects successively light receiving element, prime amplification module, attenuator, rear class amplification module, note electrical equipment and radio frequency out splice going splice; Described fiber-optic signal is connected in described light receiving element, radio and television downlink optical signal is sent to light receiving element, light receiving element converts light signal to radiofrequency signal, through prime amplification module, signal is amplified, then by attenuator, control the level height of adjusting signal, enter rear class amplification module and carry out secondary amplification, by note electrical equipment, through radio frequency out splice going splice, output signal to user.
2. fiber entering household type optical receiver according to claim 1, it is characterized in that: also comprise that power module and is in order to convert the power supply of described power module input to the power supply adaptor of DC power supply, described power supply adaptor converts the power supply of input after DC power supply to, by a DC power supply input port, is connected with described note electrical equipment.
3. fiber entering household type optical receiver according to claim 2, it is characterized in that: described note electrical equipment by power supply conversion, produce low-frequency noise target signal filter after offer described light receiving element, prime amplification module and rear class amplification module and use, to avoid the low-frequency noise of described power supply adaptor to be added to, affect the carrier-to-noise ratio index of signal in radiofrequency signal.
4. fiber entering household type optical receiver according to claim 2, is characterized in that: described power module is electric network source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320720477.8U CN203554455U (en) | 2013-11-15 | 2013-11-15 | Fiber-to-the-home type optical receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320720477.8U CN203554455U (en) | 2013-11-15 | 2013-11-15 | Fiber-to-the-home type optical receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203554455U true CN203554455U (en) | 2014-04-16 |
Family
ID=50472515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320720477.8U Expired - Fee Related CN203554455U (en) | 2013-11-15 | 2013-11-15 | Fiber-to-the-home type optical receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203554455U (en) |
-
2013
- 2013-11-15 CN CN201320720477.8U patent/CN203554455U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20201115 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |