Optical attenuatorsua haujlwm yooj yim deceptively -txo cov teeb liab lub zog los tiv thaiv cov neeg txais kev saturation-tsis tau lawv cov kev teeb tsa kom raug xav tau kev saib xyuas rau cov ntsiab lus uas ntau tus kws tshaj lij tsis pom zoo. Nyob rau hauv siab -kev sib txuas fiber ntau ceev uas tso lub hwj chim feem ntau tshaj qhov luv luv - cov kev sib txuas yuav tsum tau, cov khoom siv hluav taws xob no dhau los ua qhov tseem ceeb rau kev tswj cov teeb liab kev ncaj ncees nyob rau hauv lub receiver lub dynamic ntau yam. Phau ntawv qhia no hais txog qhov kev paub txog qhov tsis zoo uas kev cob qhia raug cai feem ntau hla.
Dab tsi tsis muaj leej twg qhia koj txog hom Attenuator
Nov yog qhov uas hais txog kev xaiv cov attenuators: hom tseem ceeb tshaj li feem ntau cov ntawv qhia tshwj xeeb.
Tsau inline attenuators tau txuas mus tas li rau hauv txoj kev fiber ntau. Zoo heev rau stability. Txaus ntshai yog tias koj twv tsis raug ntawm tus nqi attenuation. Kuv tau pom cov kws tshaj lij splice hauv 10dB attenuator nkaus xwb kom paub qhov txuas xav tau 7dB, thiab mam li nco dheev koj tab tom rov ua dua tag nrho splice enclosure.
Bulkhead style (cov uas zoo li lub tes tsho adapter) yog dab tsi cov neeg feem coob siv. Muab lawv tso rau hauv lub vaj huam sib luag, ntsaws koj lub jumper rau hauv ib qho kawg, ua tiav. Qhov yooj yim yam yog tiag tiag. Tab sis lawv ntxiv ob qhov sib txuas sib txuas tsis yog ib qho, uas txhais tau hais tias ob lub ntsiab lus sib kis.
Qhov sib txawv attenuators nrog cov me me hloov screws? Feem ntau muaj txiaj ntsig zoo hauv qhov chaw kuaj mob lossis thaum lub sijhawm ua haujlwm thaum koj tseem hu xovtooj rau hauv lub kaw lus. Tsis txhob tso siab rau cov qhab nia kawm tiav ntau dhau -lawv yog kwv yees qhov zoo tshaj plaws. Nco ntsoov xyuas nrog lub ntsuas hluav taws xob.
Kev siv ceev ceev rau cov xwm txheej sib xws:
| Qhov xwm txheej | Feem ntau ua haujlwm |
|---|---|
| Datacenter luv thaj | 5-10dB tsau, LC / UPC bulkhead |
| CATV headend | SC / APC, xyuas lub zog tuav |
| Test lub rooj zaum | Hloov pauv, FC connectors |
| Txhim kho OSP ruaj khov | Inline splice hom |
Connector Matching teeb meem
Qhov no mus ncig ua si rau beginners tas li.
APC connectors muaj 8-degree angled polish-lawv ib txwm ntsuab. UPC connectors yog xiav. Kev sib xyaw ua ke tsis yog tsuas yog muab koj cov lej rov qab tsis zoo xwb; koj tuaj yeem ua kom puas lub ntsej muag fiber ntau. Lub kaum sab xis ntawm APC nias tawm tsam lub ntsej muag tiaj tus ntawm UPC tsim cov ntsiab lus thauj khoom uas khawb ob qhov chaw.
Kuv yuav hais kom meej tias:Yog tias koj txuas APC rau UPC, koj yuav tsim qhov tsis xws luag.Tsis muaj peev xwm. Yuav.
SC, LC, FC, ST-cov no piav txog cov vaj tsev nyob. Hom polish (PC, UPC, APC) piav qhia txog qhov kawg ntawm lub ntsej muag geometry. Koj xav tau ob qho tib si kom phim. Ib qho LC / APC attenuator mus nrog LC / APC jumpers. Suab pom tseeb, tab sis nyob rau hauv lub txee tsaus ntuj thaum 2 teev sawv ntxov, xiav thiab ntsuab zoo li xav tsis thoob.
Ua ntej koj Kov Txhua Yam
Tua lub laser qhov chaw. Kuv tsis yog qhov txaus ntshai-Class 1 fiber ntau lub qhov muag- nyab xeeb raws li ib txwm muaj, tab sis cov xwm txheej ib txwm xav tias koj tsis ntsia ncaj qha rau hauv qhov qhib txuas. Siab dua - lub zog hluav taws xob (EDFA cov zis, CATV, qee qhov kev teeb tsa DWDM) kiag li tuaj yeem ua rau lub qhov muag puas sai dua li koj lub ntsej muag reflex.
Sau koj cov khoom siv ntxuav ua ntej:
Lint- cov ntaub so tsis pub dawb (tsis yog Kimwipes los ntawm lub chaw kuaj mob chemistry - fiber ntau- qib so)
IPA los yog fiber ntau ntxuav kua
Nyem -style tu cwj mem rau cov chaw nres nkoj bulkhead
Compressed cua uas yeej huv thiab qhuav
Qhov kev tshuaj ntsuam xyuas tseem ceeb tshaj li tib neeg xav. Lub 200x lossis 400x fiber ntau microscope cia koj pom cov kab mob tsis pom ntawm qhov muag liab qab. Ib tus ntiv tes ntawm lub ntsej muag kawg tuaj yeem ntxiv 1-2dB ntawm kev poob. Ib. Ntiv tes.
Txoj Kev Txhim Kho Qhov Tseeb
Piv txwv tias koj tab tom txhim kho lub bulkhead-style attenuator rau hauv lub vaj huam sib luag adapter, ntawm no yog qhov sib lawv liag tiag:
Rub cov hlua uas twb muaj lawm. Tam sim ntawd cap nws -tsis txhob muab tso rau hauv pem teb txee thaum koj fumble rau lub attenuator. Plua plav av rau ntawm qhov chaw kab rov tav hauv vib nas this. Cap lub adapter chaw nres nkoj ib yam nkaus yog tias koj yuav ua haujlwm ntau tshaj ib feeb.
Tshawb xyuas lub attenuator lub ntsej muag kawg ua ntej kev teeb tsa. Tshiab los ntawm lub hnab tsis txhais hais tias huv si. Tshawb xyuas, ntxuav yog xav tau, tshuaj xyuas dua.
Ntxig lub attenuator rau hauv lub adapter nrog khov kho, ua raws li qhov siab. Rau LC, koj yuav hnov lub latch nyem. Rau FC, xov lub txiv ntseej kom txog thaum ntiv tes- nruj ntxiv tej zaum ib lub hlis twg tig- overtightening stresses lub ferrule. Rau SC, thawb ncaj nraim mus txog thaum zaum.
Ntxuav koj daim kab xev kawg lub ntsej muag. Tshawb xyuas nws. Tsis nrog koj ob lub qhov muag. Nrog rau qhov.
Txuas lub qaum rau lub attenuator.
Qhov ntawd yog nws mechanically. Tab sis tam sim no koj yuav tsum tau ua pov thawj nws ua haujlwm.
Ntsuas qhov koj tau nruab tiag tiag
Kev teeb tsa lub zog hluav taws xob: xaiv txoj cai wavelength (tej zaum 1310nm lossis 1550nm- kuaj xyuas koj lub cev), teeb tsa chav rau dBm, xoom / siv yog tias lub ntsuas hluav taws xob txhawb nqa nws.
Qhov ntsuas koj xav tau:
Input zog ( ntsuas ua ntej lub attenuator)
Tso zis zog ( ntsuas tom qab)
Qhov txawv=qhov tseeb attenuation
Yog tias koj lub attenuator ntsuas 10dB ± 0.5dB, thiab koj ntsuas 10.3dB, koj zoo. Yog tias koj ntsuas 13dB, ib yam dab tsi tsis ncaj ncees lawm. Cov khoom siv qias neeg, qhov chaw zaum tsis zoo, tsis ncaj ncees lawm attenuator rub los ntawm cov khoom muag.
Cov ntaub ntawv ntsuas ib txwm:
| Taw tes | Nyeem ntawv | Sau ntawv |
|---|---|---|
| Tx output | +2.1 dBm | Ua ntej attenuator |
| Tom qab attenuator | -8.2 dBm | 10.3dB tag nrho |
| Rx input | -8.4 dBm | Tom qab 2 m patch |
Qhov ntxiv 0.2dB yog thaj qaum. Ib txwm.
Thaum Tej Yam Tsis Zoo
High attenuation (ntau tshaj qhov spec): Kev sib kis yog thawj tus neeg raug liam. Ib txwm. Ntxuav txhua yam thiab rov ntsuas dua. Ob tug neeg raug liam: connector mismatch los yog puas. Thib peb: koj rub lub attenuator tsis ncaj ncees lawm ntawm lub bin.
Cov ntawv nyeem tsis ruaj khov uas txav los yog hloov pauv: Kev sib txuas xoob, feem ntau. Los yog cov fiber ntau raug kev nyuaj siab rau qhov chaw -kinked, pinched nyob rau hauv ib tug cable manager, khoov nruj heev. Yam tsawg kawg khoov vojvoog muaj tshwm sim vim li cas.
Txoj kev attenuation tsawg dhau: Koj puas tau nruab nws rov qab? Qee qhov pheej yig dua attenuators yog kev taw qhia. Los yog lub ntsiab attenuation nws tus kheej ua tsis tau tejyam -tsis tshua muaj tab sis tsis tau hnov txog nrog cov absorptive-doped- fiber ntau hom tom qab thermal stress.
Rov qab poob tsis ua hauj lwm tshwm sim raws li qhov siab me ntsis yuam kev txawm tias thaum lub hwj chim qib saib tau txais. Lub teeb liab cuam tshuam cuam tshuam nrog cov teeb liab kis. APC / UPC tsis sib haum ua rau qhov no. Yog li ua tawg ferrules.
Ob peb yam uas Kev Paub Qhia
Khaws cov khoom seem. Attenuators yog pheej yig. Downtime tsis yog. Tshuag ob peb qhov tseem ceeb hauv txhua hom connector koj qhov chaw siv.
Sau txhua yam. Qhov chaw nres nkoj twg muaj lub attenuator? Tus nqi dab tsi? Nruab hnub? Yav tom ntej koj yuav ua tsaug rau koj tam sim no.
Qhov ntsuas kub tseem ceeb tshaj li cov ntaub ntawv qhia. Attenuator specs yuav hais -40℃rau +85℃kev khiav hauj lwm ntau, tab sis tus nqi attenuation tuaj yeem hloov me ntsis nrog kub. Tsis txaus rau feem ntau tseem ceeb, tab sis nyob rau hauv precision daim ntaub ntawv, xyuas ntawm kev khiav hauj lwm kub.
Document lub hauv paus. Thaum qhov txuas ua haujlwm zoo kawg nkaus, sau cov qib fais fab. Lub hlis tom qab, thaum ib tug neeg hais tias "Kuv xav tias lub teeb liab tsis muaj zog," koj yuav muaj cov lej los sib piv tsis yog kev twv.
Tsis txhob tshuab compressed cua ncaj qha rau hauv koj lub qhov muag. Qhov no suab tsis cuam tshuam tab sis tshwm sim ntau tshaj qhov koj xav tias thaum tshem plua plav los ntawm cov khoom sib txuas.
Reference Specifications Tsim nyog Paub
Rau kev yuav khoom, ntawm no yog qhov datasheet tsis tau txhais li cas:
Attenuation tus nqi thiab kam rau ua:Qhov nominal dB ntsuam xyuas ntxiv ntau npaum li cas nws tuaj yeem sib txawv. ± 0.5dB yog qhov zoo rau cov attenuators ruaj khov; ± 1dB yog qhov siv tau rau cov ntawv thov tsis yog - tseem ceeb.
Rov qab poob: How much light reflects back. Higher numbers better. UPC should give you >50dB, APC >60dB ib.
Kev tuav lub zog:Feem ntau 300mW txog 500mW rau tus qauv attenuators. High - fais fab versions mus rau 1W los yog tshaj. Tshaj qhov no thiab koj yuav ua rau lub caij attenuation puas tsuaj - hom absorptive tshwj xeeb.
PDL (polarization nyob ntawm qhov poob):Teeb meem rau coherent systems thiab meej ntsuas.<0.1dB is a reasonable spec for quality components.
IEC 61753-1 tus qauv suav nrog kev ua haujlwm yog tias koj xav tau cov ntaub ntawv ua raws cai.
Uas npog qhov tseem ceeb yam tsis tau ua txuj tias qhov no yog qhov nyuaj tshaj qhov nws yog. Kev teeb tsa attenuator ncaj nraim yog tias koj hwm cov hauv paus ntsiab lus: kev sib txuas huv, kev sib raug zoo, kev txheeb xyuas kom raug. Cov teeb meem feem ntau yog los ntawm kev maj nrawm lossis los ntawm kev kis kab mob uas koj tsis pom vim tias koj hla cov kauj ruam tshuaj ntsuam.
Khaws cov khoom siv ntxuav hauv txhua qhov chaw ua haujlwm. Tshawb xyuas ua ntej txuas. Ntsuas tom qab kev txhim kho. Txhua yam yog cov ntsiab lus.
