CN107613275A - A kind of dual output optical fiber tuner - Google Patents
A kind of dual output optical fiber tuner Download PDFInfo
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- CN107613275A CN107613275A CN201711048383.XA CN201711048383A CN107613275A CN 107613275 A CN107613275 A CN 107613275A CN 201711048383 A CN201711048383 A CN 201711048383A CN 107613275 A CN107613275 A CN 107613275A
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- module
- output end
- amplification module
- low noise
- high frequency
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Abstract
The invention discloses a kind of dual output optical fiber tuner, including the first photoelectric conversion module, second photoelectric conversion module, first impedance matching module, second impedance matching module, first low noise amplification module, second low noise amplification module, first bandpass filtering modules block, second bandpass filtering modules block, first high frequency amplifying module, second high frequency amplifying module, first frequency mixer, second frequency mixer, oscillator, phaselocked loop, first intermediate frequency amplification module, second intermediate frequency amplification module, controller, first power detection module and the second power detection module, first low noise amplification module, second low noise amplification module, first high frequency amplifying module, second high frequency amplifying module, first intermediate frequency amplification module and the second intermediate frequency amplification module are adjustable gain amplification module.Gain is adjusted according to actual conditions by the present invention, while two lines are controlled using same controller, phaselocked loop and oscillator, are economized on resources.
Description
Technical field
The present invention relates to a kind of dual output optical fiber tuner.
Background technology
In recent years, due to optical fiber and optical device, the significantly downslide of light device price, especially transmission loss index is big
Big optimization, various regions broadcasting and TV Transmission Co., Ltd proceed by the construction of all optical network.After i.e. broadcasting and TV optical signal transmission reaches cell, no longer turn
It is changed to electric signal and enters coaxial cable distribution net network, but directly optical signal is allocated, optical fiber directly arrives family, in user family
In recycle small light receiver device to carry out opto-electronic conversion, Transmission system no longer needs substantial amounts of amplifier, and reduces pair
Its requirement being powered, not only greatly reduce the generation of the loss of signal and interference, reliability, the maintainability of Transmission system
Greatly promoting, construction cost and maintenance cost substantially reduce, and because the anti-interference of optical fiber transmission is much stronger than cable transmission,
And transmission bandwidth is wider, more programme informations can be transmitted to user's family, including tens sets of high-definition television programs, utilize ripple
Divide multiplexing technology to realize the bi-directionally transmitted of uplink and downlink signals, meet three nets that client is surfed the Net by CHINA RFTCOM Co Ltd and melt
Close and require, therefore broadcasting and TV fiber entering household is widely popularized throughout the country, and newly-built community broadcasting and TV were also become in 2015
The professional standard of networking.In order to not waste the resource of original CATV set-top-box, broadcasting and TV Transmission Co., Ltd is needed to these
The client for being continuing with CATV set-top-box is equipped with an external small light receiver terminal equipment, and the intelligent acess light connects
After receiving machine equipment, cable of cable TV signal is converted to, the input of former CATV set-top-box is transferred to through coaxial cable, passed through
Standard television signal, which is converted to, after tuning, demodulation, decoding carries out program viewing.But existing dual output optical fiber is adopted with tuner
It is mixed respectively with frequency mixer with two single phaselocked loops and oscillator, waste of resource；Also can't be according to actual conditions to letter
Number size is adjusted.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of dual output optical fiber tuner.
The purpose of the present invention is achieved through the following technical solutions：A kind of dual output optical fiber tuner, including the
One photoelectric conversion module, the second photoelectric conversion module, the first impedance matching module, the second impedance matching module, the first low noise
Amplification module, the second low noise amplification module, the first bandpass filtering modules block, the second bandpass filtering modules block, the first High frequency amplification mould
Block, the second high frequency amplifying module, the first frequency mixer, the second frequency mixer, oscillator, phaselocked loop, the first intermediate frequency amplification module, second
Intermediate frequency amplification module, controller, the first power detection module and the second power detection module, the first described low noise amplification mould
Block, the second low noise amplification module, the first high frequency amplifying module, the second high frequency amplifying module, the first intermediate frequency amplification module and
Two intermediate frequency amplification modules are adjustable gain amplification module；
First photoelectric conversion module receives the first external fiber input signal, the output end of the first photoelectric conversion module and the first resistance
Anti- matching module connection, the output end of the first impedance matching module are connected with the first low noise amplification module, and the first low noise is put
The output end of big module is connected with the first bandpass filtering modules block, the output end of the first bandpass filtering modules block and the first High frequency amplification mould
Block is connected, and the output end of the first high frequency amplifying module is connected with the first frequency mixer；
Second photoelectric conversion module receives the second external fiber input signal, the output end of the second photoelectric conversion module and the second resistance
Anti- matching module connection, the output end of the second impedance matching module are connected with the second low noise amplification module, and the second low noise is put
The output end of big module is connected with the second bandpass filtering modules block, the output end of the second bandpass filtering modules block and the second High frequency amplification mould
Block is connected, and the output end of the second high frequency amplifying module is connected with the second frequency mixer；
The phaselocked loop voltage control output end of controller is connected with phaselocked loop, and the output end of phaselocked loop is connected with oscillator, vibration
Two output ends of device are connected with the first frequency mixer and the second frequency mixer respectively, and the output end of the first frequency mixer is put with the first intermediate frequency
Big module connection, the output end of the first intermediate frequency amplification module export the first intermediate-freuqncy signal, the output end of the second frequency mixer and second
Intermediate frequency amplification module connects, and the output end of the second intermediate frequency amplification module exports the second intermediate-freuqncy signal；
First power detection module detects the signal magnitude on the first signal transmission path and sent to controller, controller according to
Signal magnitude adjusts the gain of the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency amplification module；Second
Signal magnitude and transmission in power detection module detection secondary signal transmission path is to controller, and controller is according to signal magnitude
Adjust the gain of the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module.
Further, described low noise amplification module includes the low-noise amplifier of two series connection.
The beneficial effects of the invention are as follows：The present invention according to actual conditions to low noise amplification module, high frequency amplifying module and
The gain of intermediate frequency amplification module is adjusted, while two lines are controlled using same controller, phaselocked loop and oscillator
System, economizes on resources.
Brief description of the drawings
Fig. 1 is block diagram of the present invention.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：As shown in figure 1, a kind of dual output optical fiber is used
Tuner, including the first photoelectric conversion module, the second photoelectric conversion module, the first impedance matching module, the second impedance matching mould
Block, the first low noise amplification module, the second low noise amplification module, the first bandpass filtering modules block, the second bandpass filtering modules block,
One high frequency amplifying module, the second high frequency amplifying module, the first frequency mixer, the second frequency mixer, oscillator, phaselocked loop, the first intermediate frequency
Amplification module, the second intermediate frequency amplification module, controller, the first power detection module and the second power detection module, described
In one low noise amplification module, the second low noise amplification module, the first high frequency amplifying module, the second high frequency amplifying module, first
Frequency amplification module and the second intermediate frequency amplification module are adjustable gain amplification module；
First photoelectric conversion module receives the first external fiber input signal, the output end of the first photoelectric conversion module and the first resistance
Anti- matching module connection, the output end of the first impedance matching module are connected with the first low noise amplification module, and the first low noise is put
The output end of big module is connected with the first bandpass filtering modules block, the output end of the first bandpass filtering modules block and the first High frequency amplification mould
Block is connected, and the output end of the first high frequency amplifying module is connected with the first frequency mixer；
Second photoelectric conversion module receives the second external fiber input signal, the output end of the second photoelectric conversion module and the second resistance
Anti- matching module connection, the output end of the second impedance matching module are connected with the second low noise amplification module, and the second low noise is put
The output end of big module is connected with the second bandpass filtering modules block, the output end of the second bandpass filtering modules block and the second High frequency amplification mould
Block is connected, and the output end of the second high frequency amplifying module is connected with the second frequency mixer；
The phaselocked loop voltage control output end of controller is connected with phaselocked loop, and the output end of phaselocked loop is connected with oscillator, vibration
Two output ends of device are connected with the first frequency mixer and the second frequency mixer respectively, and the output end of the first frequency mixer is put with the first intermediate frequency
Big module connection, the output end of the first intermediate frequency amplification module export the first intermediate-freuqncy signal, the output end of the second frequency mixer and second
Intermediate frequency amplification module connects, and the output end of the second intermediate frequency amplification module exports the second intermediate-freuqncy signal；
First power detection module detects the signal magnitude on the first signal transmission path and sent to controller, controller according to
Signal magnitude adjusts the gain of the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency amplification module；Second
Signal magnitude and transmission in power detection module detection secondary signal transmission path is to controller, and controller is according to signal magnitude
Adjust the gain of the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module.
The flow of the present invention is as follows：First TV fiber-optic signal converts optical signals into electricity by the first photoelectric conversion module
Signal, suitable impedance is converted electrical signals to after the first impedance matching module, after put through the first low noise amplification module
After big and the first bandpass filtering modules block suppresses interference, believe with being controlled by a controller the local oscillator as caused by phaselocked loop and oscillator
Number through the first frequency mixer be mixed, afterwards again through the first intermediate frequency amplification module amplification after export；And in whole process, the first power
Signal magnitude and transmission to controller, controller in detection module detection signal transmission path adjusts first according to signal magnitude
The gain of low noise amplification module, the first high frequency amplifying module and the first intermediate frequency amplification module；
Second TV fiber-optic signal converts optical signals into electric signal by the second photoelectric conversion module, through the second impedance matching mould
Suitable impedance is converted electrical signals to after block, after through the second low noise amplification module amplification and the second bandpass filtering modules block
After suppressing interference, it is mixed with being controlled by a controller the local oscillation signal as caused by phaselocked loop and oscillator through the second frequency mixer, it
Exported again after the amplification of the second intermediate frequency amplification module afterwards；And in whole process, the transmission of the second power detection module detection signal
Signal magnitude and transmission to controller, controller on path adjusts the second low noise amplification module, second according to signal magnitude
The gain of high frequency amplifying module and the second intermediate frequency amplification module.
Two lines are controlled using same controller, phaselocked loop and oscillator, are economized on resources.
More preferably, in the present embodiment, described low noise amplification module includes the low-noise amplifier of two series connection.
The present invention is described by embodiment, but is not limited the invention, with reference to description of the invention, institute
Other changes of disclosed embodiment, are such as readily apparent that, such change should belong to for the professional person of this area
Within the scope of the claims in the present invention limit.
Claims (2)
- A kind of 1. dual output optical fiber tuner, it is characterised in that：Including the first photoelectric conversion module, the second opto-electronic conversion mould Block, the first impedance matching module, the second impedance matching module, the first low noise amplification module, the second low noise amplification module, One bandpass filtering modules block, the second bandpass filtering modules block, the first high frequency amplifying module, the second high frequency amplifying module, the first frequency mixer, Second frequency mixer, oscillator, phaselocked loop, the first intermediate frequency amplification module, the second intermediate frequency amplification module, controller, the inspection of the first power Survey module and the second power detection module, the first described low noise amplification module, the second low noise amplification module, the first high frequency Amplification module, the second high frequency amplifying module, the first intermediate frequency amplification module and the second intermediate frequency amplification module are adjustable gain amplification Module；First photoelectric conversion module receives the first external fiber input signal, the output end of the first photoelectric conversion module and the first resistance Anti- matching module connection, the output end of the first impedance matching module are connected with the first low noise amplification module, and the first low noise is put The output end of big module is connected with the first bandpass filtering modules block, the output end of the first bandpass filtering modules block and the first High frequency amplification mould Block is connected, and the output end of the first high frequency amplifying module is connected with the first frequency mixer；Second photoelectric conversion module receives the second external fiber input signal, the output end of the second photoelectric conversion module and the second resistance Anti- matching module connection, the output end of the second impedance matching module are connected with the second low noise amplification module, and the second low noise is put The output end of big module is connected with the second bandpass filtering modules block, the output end of the second bandpass filtering modules block and the second High frequency amplification mould Block is connected, and the output end of the second high frequency amplifying module is connected with the second frequency mixer；The phaselocked loop voltage control output end of controller is connected with phaselocked loop, and the output end of phaselocked loop is connected with oscillator, vibration Two output ends of device are connected with the first frequency mixer and the second frequency mixer respectively, and the output end of the first frequency mixer is put with the first intermediate frequency Big module connection, the output end of the first intermediate frequency amplification module export the first intermediate-freuqncy signal, the output end of the second frequency mixer and second Intermediate frequency amplification module connects, and the output end of the second intermediate frequency amplification module exports the second intermediate-freuqncy signal；First power detection module detects the signal magnitude on the first signal transmission path and sent to controller, controller according to Signal magnitude adjusts the gain of the first low noise amplification module, the first high frequency amplifying module and the first intermediate frequency amplification module；Second Signal magnitude and transmission in power detection module detection secondary signal transmission path is to controller, and controller is according to signal magnitude Adjust the gain of the second low noise amplification module, the second high frequency amplifying module and the second intermediate frequency amplification module.
- A kind of 2. dual output optical fiber tuner according to claim 1, it is characterised in that：Described low noise amplification mould Block includes the low-noise amplifier of two series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711048383.XA CN107613275A (en) | 2017-10-31 | 2017-10-31 | A kind of dual output optical fiber tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711048383.XA CN107613275A (en) | 2017-10-31 | 2017-10-31 | A kind of dual output optical fiber tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107613275A true CN107613275A (en) | 2018-01-19 |
Family
ID=61084089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711048383.XA Withdrawn CN107613275A (en) | 2017-10-31 | 2017-10-31 | A kind of dual output optical fiber tuner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107613275A (en) |
-
2017
- 2017-10-31 CN CN201711048383.XA patent/CN107613275A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180119 |