CN107613276A - A kind of single output optical fibre tuner - Google Patents
A kind of single output optical fibre tuner Download PDFInfo
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- CN107613276A CN107613276A CN201711048416.0A CN201711048416A CN107613276A CN 107613276 A CN107613276 A CN 107613276A CN 201711048416 A CN201711048416 A CN 201711048416A CN 107613276 A CN107613276 A CN 107613276A
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- module
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- amplification module
- low noise
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Abstract
The invention discloses a kind of single output optical fibre tuner, photoelectric conversion module receives external fiber input signal, the output end of photoelectric conversion module is connected by impedance matching module, low noise amplification module, bandpass filtering modules block, high frequency amplifying module and frequency mixer, the phaselocked loop voltage control output end of controller is connected with phaselocked loop, the output end of phaselocked loop is connected with oscillator, the output end of oscillator is connected with frequency mixer, the output end of frequency mixer is connected with intermediate frequency amplification module, the output end output intermediate-freuqncy signal of intermediate frequency amplification module；Signal magnitude and transmission to controller, controller in power detection module detection signal transmission path adjusts the gain of low noise amplification module, high frequency amplifying module and intermediate frequency amplification module according to signal magnitude.The present invention is adjusted according to gain of the actual conditions to low noise amplification module, high frequency amplifying module and intermediate frequency amplification module.
Description
Technical field
The present invention relates to a kind of single output optical fibre 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 single output optical fibre with tuner simultaneously
Signal magnitude will not be adjusted according to actual conditions.
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 single output optical fibre tuner.
The purpose of the present invention is achieved through the following technical solutions：A kind of single output optical fibre tuner, including light
Electric modular converter, impedance matching module, low noise amplification module, bandpass filtering modules block, high frequency amplifying module, frequency mixer, vibration
Device, phaselocked loop, intermediate frequency amplification module, controller and power detection module, described low noise amplification module, high frequency amplifying module
It is adjustable gain amplification module with intermediate frequency amplification module；Photoelectric conversion module receives external fiber input signal, opto-electronic conversion
The output end of module is connected with impedance matching module, and the output end of impedance matching module is connected with low noise amplification module, low noise
The output end of sound amplification module is connected with bandpass filtering modules block, and the output end of bandpass filtering modules block is connected with high frequency amplifying module,
The output end of high frequency amplifying module is connected with frequency mixer, and the phaselocked loop voltage control output end of controller is connected with phaselocked loop, lock
The output end of phase ring is connected with oscillator, and the output end of oscillator is connected with frequency mixer, and output end and the intermediate frequency of frequency mixer amplify
Module connects, the output end output intermediate-freuqncy signal of intermediate frequency amplification module；Described power detection module detection signal transmission path
On signal magnitude and send to controller, controller adjusts low noise amplification module, high frequency amplifying module according to signal magnitude
With the gain of 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, specifically：TV fiber-optic signal is converted optical signals into by photoelectric switching circuit
Electric signal, suitable impedance is converted electrical signals to after impedance matching circuit, after through low noise amplification module amplification and
After bandpass filtering modules block suppresses interference, with being controlled by a controller as caused by phaselocked loop and oscillator local oscillation signal through frequency mixer
Mixing, exported again after the amplification of intermediate frequency amplification module afterwards；And in whole process, power detection module detection signal transmission road
Signal magnitude and transmission to controller, controller on footpath adjusts low noise amplification module, High frequency amplification mould according to signal magnitude
The gain of block and intermediate frequency amplification module.
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 single output optical fibre tuner, including photoelectric conversion module, impedance matching module, low noise amplification
Module, bandpass filtering modules block, high frequency amplifying module, frequency mixer, oscillator, phaselocked loop, intermediate frequency amplification module, controller and power
Detection module, described low noise amplification module, high frequency amplifying module and intermediate frequency amplification module are adjustable gain amplification module；
Photoelectric conversion module receives external fiber input signal, and the output end of photoelectric conversion module is connected with impedance matching module, impedance
The output end of matching module is connected with low noise amplification module, and output end and the bandpass filtering modules block of low noise amplification module connect
Connect, the output end of bandpass filtering modules block is connected with high frequency amplifying module, and the output end of high frequency amplifying module is connected with frequency mixer, control
The phaselocked loop voltage control output end of device processed is connected with phaselocked loop, and the output end of phaselocked loop is connected with oscillator, oscillator it is defeated
Go out end to be connected with frequency mixer, the output end of frequency mixer is connected with intermediate frequency amplification module, in the output end output of intermediate frequency amplification module
Frequency signal；Signal magnitude in described power detection module detection signal transmission path is simultaneously sent to controller, controller root
According to the gain of signal magnitude regulation low noise amplification module, high frequency amplifying module and intermediate frequency amplification module.
The flow of the present invention is as follows：TV fiber-optic signal converts optical signals into electric signal by photoelectric conversion module, warp
Suitable impedance is converted electrical signals to after impedance matching circuit, after through low noise amplification module amplification and bandpass filtering mould
After block suppresses interference, it is mixed with being controlled by a controller the local oscillation signal as caused by phaselocked loop and oscillator through frequency mixer, afterwards
Exported again after the amplification of intermediate frequency amplification module；And in whole process, the letter in power detection module detection signal transmission path
Number size simultaneously sends to controller, controller and adjusts low noise amplification module, high frequency amplifying module and intermediate frequency according to signal magnitude
The gain of amplification module.
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. single output optical fibre tuner, it is characterised in that：Including photoelectric conversion module, impedance matching module, low noise Amplification module, bandpass filtering modules block, high frequency amplifying module, frequency mixer, oscillator, phaselocked loop, intermediate frequency amplification module, controller and Power detection module, described low noise amplification module, high frequency amplifying module and intermediate frequency amplification module are adjustable gain amplification Module；Photoelectric conversion module receives external fiber input signal, and the output end of photoelectric conversion module is connected with impedance matching module, The output end of impedance matching module is connected with low noise amplification module, the output end and bandpass filtering modules block of low noise amplification module Connection, the output end of bandpass filtering modules block are connected with high frequency amplifying module, and the output end of high frequency amplifying module is connected with 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, oscillator Output end is connected with frequency mixer, and the output end of frequency mixer is connected with intermediate frequency amplification module, the output end output of intermediate frequency amplification module Intermediate-freuqncy signal；Signal magnitude in described power detection module detection signal transmission path is simultaneously sent to controller, controller The gain of low noise amplification module, high frequency amplifying module and intermediate frequency amplification module is adjusted according to signal magnitude.
- A kind of 2. single output optical fibre 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 |
|---|---|---|---|
| CN201711048416.0A CN107613276A (en) | 2017-10-31 | 2017-10-31 | A kind of single output optical fibre tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711048416.0A CN107613276A (en) | 2017-10-31 | 2017-10-31 | A kind of single output optical fibre tuner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107613276A true CN107613276A (en) | 2018-01-19 |
Family
ID=61084137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711048416.0A Withdrawn CN107613276A (en) | 2017-10-31 | 2017-10-31 | A kind of single output optical fibre tuner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107613276A (en) |
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2017
- 2017-10-31 CN CN201711048416.0A patent/CN107613276A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180119 |
|
| WW01 | Invention patent application withdrawn after publication |