CN207603642U - A kind of photoreceiver with forward signal quality inspection device - Google Patents
A kind of photoreceiver with forward signal quality inspection device Download PDFInfo
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- CN207603642U CN207603642U CN201721586462.1U CN201721586462U CN207603642U CN 207603642 U CN207603642 U CN 207603642U CN 201721586462 U CN201721586462 U CN 201721586462U CN 207603642 U CN207603642 U CN 207603642U
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Abstract
The utility model discloses a kind of photoreceivers with forward signal quality inspection device, signal quality monitoring device is integrated into inside the photoreceiver of forward signal, by FBCM modules to cable television forward signal real-time Whole frequency band spectrum monitoring, and the QAM signals of every channel can be demodulated, pass through capture, analysis of the demodulation transmission signal to its quality and index, processing, storage, and pass data to webmaster end, utilize webmaster end warning system, it enables a technician to before failure accident, receive problem information, and problem is accurately positioned, it avoids causing great broadcast accident and loss, greatly mitigate manual maintenance pressure simultaneously, improve network operation efficiency.
Description
Technical field
The utility model is related to cable television technology field more particularly to a kind of light with forward signal quality inspection device
Receiver.
Background technology
As the integration of three networks is pushed forward comprehensively, " broadband China " strategy is deeply implemented, HFC (Hybrid are used in CHINA RFTCOM Co Ltd
Fiber-Coaxial, hybrid fiber coax) scheme carry out Two-way Network transformation during, the items such as network operation are referred to
Mark also proposed higher requirement.CHINA RFTCOM Co Ltd carries the business such as the radio and television of huge numbers of families, video interactive, with business
Continuous development, safe broadcast is significant, network security be in CHINA RFTCOM Co Ltd Security Construction it is essential one work, and
Low cost safeguards a big difficulty for also becoming the research of each operator.
At present in CHINA RFTCOM Co Ltd, forward signal program source is only monitored in bitstream layers in face of signal quality, when being modulated to
The signal quality of each channel can not be monitored after radiofrequency signal on line, existing optical platform Network Management System is to transmission device
Net source level is managed, main to monitor transmission device basic parameter, including temperature, voltage, luminous power, total radio frequency power etc., face
To the fundamental aspect that object is equipment, it is impossible to monitor cable TV network service layer, lack to appliance services channel rank
Management, fail the requirement for reaching total signal monitoring management.
Utility model content
In order to solve technical problem present in background technology, the utility model proposes a kind of band forward signal quality prisons
The photoreceiver of device is controlled, to realize the monitoring to cable TV network service layer.
The utility model proposes a kind of photoreceiver with forward signal quality inspection device, including：
Photoelectric converter receives cable TV network forward direction optical signal, the optical signal of reception is converted to rf signal；
Numerical-control attenuator is connect with photoelectric converter and CPU；
First stage amplifier is connect with numerical-control attenuator；
Balanced device is connect with first stage amplifier and CPU, is declined for compensating wide band signal by remote transmission high and low frequency
Subtract the slope of different generations；
Two-stage amplifier is connect with balanced device；
First coupler, is connected between two-stage amplifier and radio frequency output port；
Second coupler is gone here and there between the first coupler and radio frequency testing mouth；
FBCM modules are connect with the second coupler, system management module and CPU, for being monitored on-line to rf signal.
Preferably, numerical-control attenuator by automatic growth control or manual gain control to rf signal link gain into
Row control.
Preferably, FBCM modules specifically include：
Level-one LNA low-noise amplifiers, connect with the second coupler output；
Automatic gain control amplifier is connect with the output terminal of level-one LNA low-noise amplifiers, and with high speed A/D chip
Incoming signal level size automatically controls link gain；
Wave digital lowpass filter is connect with the output terminal of automatic gain control amplifier；
High-speed AD is connect with the output terminal of wave digital lowpass filter；
DSP digital signal processing modules, connect with high-speed AD.
Signal quality monitoring device is integrated into inside the photoreceiver of forward signal by the utility model, passes through FBCM moulds
Block real-time Whole frequency band spectrum monitoring to cable television forward signal, and the QAM signals per channel can be demodulated, by capturing, demodulating
Analysis, processing, storage of the signal to its quality and index are transmitted, and passes data to webmaster end, system is alerted using webmaster end
System, enables a technician to before failure accident, receives problem information, and problem is accurately positioned, and avoids causing weight
It is big to broadcast accident and loss, while greatly mitigate manual maintenance pressure, improve network operation efficiency.
Description of the drawings
Fig. 1 is a kind of photoreceiver structure with forward signal quality inspection device that the utility model embodiment 1 proposes
Figure；
Fig. 2 is FBCM function structure charts in the utility model embodiment 1.
Specific embodiment
The utility model embodiment 1 proposes a kind of photoreceiver with forward signal quality inspection device, the light-receiving
For machine in cable TV network, positive photoreceiver is the key equipment of HFC nets, is to connect network and the bridge of cable TV subscriber
Beam, complete cable TV network optical-electronic conversion (forward signal) and forward signal is decayed, is amplified, equilibrium treatment is set
It is standby.The photoreceiver as shown in Figure 1, including：
Photoelectric converter 10 receives cable TV network forward direction optical signal, the optical signal of reception is converted to radio frequency telecommunications
Number；10 core devices of photoelectric converter use PIN photodiode, when PIN photodiode receives optical signal, generate light
Electric current, the intensity of light is bigger, and forward current is also bigger, and the variation of light causes photodiode current to change, and optical signal is with this original
Reason is converted into electric signal.Calculation formula is：Photoelectric current (IPD)=incident optical power (P) * PIN photodiode responsivenesses.
Numerical-control attenuator 20 connect with photoelectric converter 10 and CPU90, decays to rf signal；Cable television
Signal is adjustable to meet positive output level of light receiver after the output of photoelectric converter 10, accesses adjustable numerical-control attenuator,
Signal is controlled to amplify the gain of link by the spi bus of CPU, the amplifier input level to avoid amplification link is excessively high, institute
After adjustable numerical-control attenuator is placed on optical receiver module, before amplifier.
First stage amplifier 30 is connect with numerical-control attenuator 20, and preposition amplification is carried out to rf signal；When optical signal is converted
After electric signal, the influence of the noise of pre-amplifier to system link is very big, so the amplification using difference low noise
Transmission signal is done first order enhanced processing by mode.
Balanced device 40 is connect with first stage amplifier 30 and CPU90, and compensating wide band signal is by remote transmission low cut
Slope small, that high frequency attenuation generates greatly.Slope equalizing circuit is added among dual-stage amplifier.Cable TV signal belongs to wide
Band signal, bandwidth 45MHz-1218MHz, when signal is by remote transmission, because of transmission medium (optical fiber, coaxial cable)
Loss, can generate the broadband signal slope that high-frequency loss is big, Frequency Power Loss is small, the spi bus control that equalizing circuit passes through CPU
The low frequency part for amplifying link is carried out attenuation compensation by system, and high frequency section is constant, adds in the slope phase with being generated by transmission loss
Anti- attenuation compensation will carry slope signal low frequency and high frequency section filling-in, and the flatness of broadband signal be improved, conducive to rear class
The transmission and application of device signal.
Two-stage amplifier 50 is connect with balanced device 40, and the rf signal after equilibrium is amplified, to improve uplink linght
The fan-out capability of reception, and pass through radio frequency output port and export rf signal.Signal amplifier chain road is using fixed gain, height
The two-stage radio-frequency amplifier of fan-out capability improves full range band signal fan-out capability, meets the needs of rear class application apparatus.
First coupler 60, is connected between two-stage amplifier 50 and radio frequency output port, for by rf signal coupling
A part is closed out to radio frequency testing mouth, operation maintenance personnel can be allowed to carry out live on-line monitoring using instrument.Photoreceiver provides defeated
Optical power detects interface, and by the voltage detecting to its interface, which is passed through at operational amplifier and A/D chip
Reason is transferred to CPU, by system management module and network management platform, feeds back in face of O＆M technical staff.
Second coupler 70 is gone here and there between the first coupler 60 and radio frequency testing mouth, for the rf signal being coupled out
Access FBCM modules；
FBCM modules 80 are connect with the second coupler 70, system management module 100 and CPU90, online to rf signal
Monitoring by acquisition and processing of the system management module 100 to information, is transmitted to network management platform, realizes human-computer interaction work(
Energy.
In the utility model embodiment, for positive photoreceiver output mode, cable television webmaster management system is established
Two kinds of operating modes：AGC and MGC.
Under agc mode, mouth radio-frequency power detection chip is tested by TP, detection is monitored to output signal power, fed back
To CPU, by calculation process, CPU sends out gain control command to adjustable numerical-control attenuator, ensures the level of output port one
Within the scope of fixed, i.e. radio-frequency power agc mode.
Under MGC patterns, regulating command is controlled by artificially sending gain, changes signal enhanced processing link gain, makes defeated
Exit port level meets practical different scenes application demand.
In the utility model embodiment, FBCM modules 80 are as shown in Figure 2：Including：Level-one LNA low-noise amplifiers 81, with
Second coupler, 70 output terminal connects, and the rf signal being coupled out to it carries out prime enhanced processing；Automatic growth control is put
Big device 82, connect with the output terminal of level-one LNA low-noise amplifiers 81, and two level amplification, and and 12Bit are carried out to rf signal
84 incoming signal level size of high speed A/D chip automatically controls link gain；Wave digital lowpass filter 83, with automatic growth control
The output terminal connection of amplifier 82, by High-frequency Interference and noise filtering；High-speed AD 84, the output terminal with wave digital lowpass filter 83
Connection, samples Whole frequency band rf signal；DSP digital signal processing modules 85, connect with AD84, by high-speed AD 84
The digital signal of input carries out fft analysis, and FBCM entire spectrums scanning (spectrum analysis) data are finally shown to user terminal interface.
Processed data are carried out every channel signals demodulation by Tuner demodulators built in DSP again, by signal of the forward signal per channel
Quality is transmitted to user terminal interface, such as SNR, MER, BER, Power, planisphere with index.
In the utility model embodiment, the FBCM modules built in photoreceiver use the direct sample mode of high-speed AD, relatively
In original analog domain spectrum scan detection mode using the discrete elements such as frequency mixer, phaselocked loop structure, provide it is more accurate and
Faster signal detection ability, real-time Whole frequency band signal spectrum capture in the case where data do not have any loss, carry out real
When analyzing and processing, accurately capture the signal of transition or burst.Alarm function is provided on the basis of available data simultaneously, is increased
Add the stability of network, improve O＆M efficiency.
The preferable specific embodiment of the above, only the utility model, but the scope of protection of the utility model is not
This is confined to, in the technical scope that any one skilled in the art discloses in the utility model, according to this practicality
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (3)
1. a kind of photoreceiver with forward signal quality inspection device, which is characterized in that including：
Photoelectric converter (10) receives cable TV network forward direction optical signal, the optical signal of reception is converted to rf signal；
Numerical-control attenuator (20) is connect with photoelectric converter (10) and CPU (90), for decaying to rf signal；
First stage amplifier (30) is connect with numerical-control attenuator (20), for carrying out preposition amplification to rf signal；
Balanced device (40) is connect with first stage amplifier (30) and CPU (90), for compensating wide band signal by remote transmission
The slope of the different generations of high and low frequency attenuation；
Two-stage amplifier (50) is connect with balanced device (40), for being amplified to the rf signal after equilibrium；
First coupler (60) is connected on two-stage amplifier (50) between radio frequency output port；
Second coupler (70) is gone here and there between the first coupler (60) and radio frequency testing mouth；
FBCM modules (80) are connect with the second coupler (70), system management module (100) and CPU (90), for radio frequency electrical
Signal is monitored on-line.
2. the photoreceiver according to claim 1 with forward signal quality inspection device, which is characterized in that numerical control attenuation
Device (20) is amplified rf signal link gain by automatic growth control or manual gain control.
3. the photoreceiver according to claim 1 with forward signal quality inspection device, which is characterized in that FBCM modules
(80) it specifically includes：
Level-one LNA low-noise amplifiers (81) are connect with the second coupler (70) output terminal；
Automatic gain control amplifier (82) is connect with the output terminal of level-one LNA low-noise amplifiers (81), and with high-speed AD core
Piece (84) incoming signal level size automatically controls link gain；
Wave digital lowpass filter (83) is connect with the output terminal of automatic gain control amplifier (82)；
High-speed AD (84) is connect with the output terminal of wave digital lowpass filter (83)；
DSP digital signal processing modules (85) are connect with high-speed AD (84).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721586462.1U CN207603642U (en) | 2017-11-23 | 2017-11-23 | A kind of photoreceiver with forward signal quality inspection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721586462.1U CN207603642U (en) | 2017-11-23 | 2017-11-23 | A kind of photoreceiver with forward signal quality inspection device |
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| Publication Number | Publication Date |
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| CN207603642U true CN207603642U (en) | 2018-07-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109547296A (en) * | 2019-01-10 | 2019-03-29 | 凌云天博光电科技股份有限公司 | A kind of monitoring method, monitoring modular and the system of cable TV network link signal quality |
-
2017
- 2017-11-23 CN CN201721586462.1U patent/CN207603642U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109547296A (en) * | 2019-01-10 | 2019-03-29 | 凌云天博光电科技股份有限公司 | A kind of monitoring method, monitoring modular and the system of cable TV network link signal quality |
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