Nyob rau hauv niaj hnub broadband access networks,FTTH (Fiber rau Tsev)tau dhau los ua qhov kev daws teeb meem loj tshaj plaws. Raws li cov neeg siv khoom xav tau rau siab-txhais video, sib tham sib TV, thiab siab - internet ceev txuas ntxiv zuj zus,AGC CATV Receiver (Tsis Siv Neeg Gain Control Cable TV Receiver)plays lub luag haujlwm tseem ceeb hauv FTTH systems. Kab lus no muab cov ntsiab lus dav dav ntawm cov qauv kev ua haujlwm, cov txiaj ntsig zoo, cov xwm txheej ntawm daim ntawv thov, thiab cov qauv kev lag luam ntawm FTTH AGC CATV Receiver-pab cov neeg nyeem nkag siab txog qhov tseem ceeb ntawm lub network no.
FTTH AGC CATV Receiver yog dab tsi?
IbFTTH AGC CATV Receiveryog ib qho tshwj xeeb RF (xov tooj cua zaus) teeb liab txais khoom tsim los rau fiber ntau-rau-- hauv tsev network. Nws hloov pauv cov cim analog lossis digital CATV cov cim xa mus hla cov khoom siv fiber ntau rov qab rau hauv RF cov cim qhia tau sib xws nrog coaxial cable faib, ua kom xa mus rau qhov kawg- cov neeg siv khoom siv xws li teeb tsa- cov thawv sab saum toj thiab TV.
Lub sij hawm "AGC" stands rauAutomatic Gain Control, dynamic teeb liab amplification txheej txheem uas ua kom ruaj khov tso zis theem teeb liab -txawm tias thaum input optical fais fab hloov pauv - yog li tswj tau siab - video kis tau tus mob.
Nws Ua Haujlwm Li Cas: Ib Lub Ntsiab Lus Yooj Yim
Optical Signal txais: Cov cuab yeej tau txais cov teeb liab CATV kho qhov muag (feem ntau ntawm 1550 nm wavelength) ntawm tus qauv fiber ntau cuam tshuam xws li SC / APC los ntawm OLT (Optical Line Terminal) lossis optical tis point.
Opto-Kev hloov pauv hluav taws xob: Ib qho kev sib koom ua ke PIN lossis APD photodetector hloov cov teeb liab kho qhov muag rau hauv cov teeb liab hluav taws xob.
AGC kev ua haujlwm: Tsis siv neeg nce tswj Circuit Court dynamically kho amplifier nce raws li cov khoom siv kho qhov muag, stabilizing RF tso zis theem nyob rau hauv tus qauv ntau yam (xws li, 75 ± 3 dBµV).
RF tso zis: Cov teeb liab RF ua tiav yog xa los ntawm F-hom connector rau tus neeg siv nyob rau hauv -home coaxial tis network.
Vim li cas AGC thiaj li tseem ceeb?
Hauv qhov tiag -Kev xa tawm FTTH thoob ntiaj teb, qhov sib txawv ntawm qhov sib txuas ntawm fiber ntau, qhov sib faib sib faib, thiab qhov kub thiab txias tuaj yeem ua rau muaj qhov sib txawv loj hauv qhov tau txais lub zog kho qhov muag hla cov neeg siv khoom kawg. Tsis muaj AGC:
Tsawg optical zog→ Txo cov teeb liab- rau- suab nrov piv → Video daus los yog pixelation;
Siab optical zog→ Amplifier saturation → Teeb liab distortion thiab intermodulation cuam tshuam.
Ib qho AGC- qhib CATV receiver cia li them nyiaj rau cov kev hloov pauv no,zoo heev txhim kho qhov system robustness thiab ua kom cov neeg siv kev paub zoo ib yam-tshwj xeeb yog qhov tseem ceeb hauv loj - cais PON tes hauj lwm (piv txwv li, 1:64 lossis siab dua).
Cov Ntsiab Lus Qhia Tshwj Xeeb & Cov Txheej Txheem Xaiv
| Parameter | Hom Tus Nqi / Ntau | Sau ntawv |
|---|---|---|
| Input Wavelength | 1 550nm | Tau tshaj EDFA amplifiers |
| Optical Input Power Range | -10 rau +2 dBm (AGC muaj txiaj ntsig ntau) | Qhov dav dav dua |
| RF tso zis theem | 75 ± 3 dBµV | Ua raws li cov qauv zoo li GY/T 106-1999 |
| Ntau zaus | 47–{1}} MHz lossis 54–1002 MHz | Txhawb nqa tag nrho CATV channel spectrum |
| C/N (Carrier-to-Noise Ratio) | Ntau dua lossis sib npaug li 50 dB | Qhov taw qhia tseem ceeb ntawm cov teeb liab zoo |
| CSO/CTB | Tsawg dua lossis sib npaug rau -65 dBc | Ntsuas qhov tsis ncaj ncees lawm |
Thaum xaiv ib lub receiver, ua qhov tseem ceeb ntawm AGC dynamic ntau yam, tso zis flatness, kev cia siab, thiab kev txhawb nqa rau tej thaj chaw deb tswj raws tu qauv (xws li, SNMP lossis TR-069).
Daim ntawv thov Scenario
Triple-Ua si FTTH Networks: Ib txhij xa cov ntaub ntawv, lub suab, thiab CATV cov kev pabcuam;
HFC Network Fiberization Hloov Kho: Hloov cov qub coaxial amplifiers kom nce bandwidth thiab kev pab them nqi;
Kev Txhim Kho Kev Nyob Hauv Tshiab / Cov Zej Zog Ntse: Deployed as standard nyob rau hauv - tsev termination units;
Chaw ntiav pw, Apartment Complexes (MDUs): Centralized deployment txo cov nqi khiav lag luam.
Kev Lag Luam Trends & Yav Tom Ntej Outlook
Evolution Toward DOCSIS 4.0 thiab 10G-PON: Cov neeg txais yuav tsum txhawb nqa bandwidths siab dua thiab cov txheej txheem kev hloov kho siab;
Intelligent Remote Management: Kev koom ua ke nrog IoT modules tiag tiag - lub sijhawm qhia txog xwm txheej thiab kev saib xyuas kev kwv yees;
Miniaturization & Kev siv hluav taws xob tsawg: Sib ntsib qhov zoo nkauj thiab lub zog -kev xav tau ntawm cov chaw nyob;
Kev them nyiaj yug rau 4K/8K Ultra-HD tshaj tawm: Yuav tsum tau txhim kho C/N piv thiab linearity kev ua tau zoo.
