Erbium-Doped Fiber Amplifiers (EDFAs)

Erbium-doped fiber amplifiers (EDFAs) inoshandisa zvisingawanzo-ivhu zvinhu zvakaita seerbium (Er3+) sesvikiro rekusimudzira.Iyo inodonhedzwa mukati me fiber core panguva yekugadzira maitiro.Iyo ine chidimbu chipfupi chefiber (kazhinji 10 m kana zvakadaro) yakagadzirwa negirazi umo diki inodzorwa huwandu hweerbium inowedzerwa se dopant nenzira yeion (Er3+).Saka, iyo silica fiber inoshanda senge svikiro.Ndiyo dopants (erbium) kwete silica fiber iyo inosarudza kushanda kwewavelength uye kuwana bandwidth.MaEDFA anowanzo shanda munharaunda ye1550 nm wavelength uye anogona kupa hunyanzvi hunodarika 1 Tbps.Saka, anoshandiswa zvakanyanya muWDM masisitimu.

Nheyo yekusimudzirwa kuburitsa inoshanda kune iyo amplification mechanism yeEDFA.Kana iyo dopant (an erbium ion) iri munzvimbo ine simba guru, chiitiko fotoni cheiyo inopinza chiratidzo chechiratidzo chinoikurudzira.Inoburitsa rimwe resimba rayo kune dopant uye inodzokera kune yakaderera-simba mamiriro ("yakakurudzirwa emission") iyo yakagadzikana zvakanyanya.Mufananidzo uri pazasi unoratidza chimiro chekutanga cheEDFA.

1.1 Chimiro cheiyo EDFA

Iyo pombi laser diode inowanzo gadzira chiratidzo chemaziso chewavelength (kungave 980 nm kana 1480 nm) nepamusoro simba (~ 10-200 mW).Ichi chiratidzo chinosanganiswa nechiedza chekuisa chiratidzo muchikamu che erbiumdoped che silica fiber kuburikidza neWDM coupler.Ioni dzeerbium dzinotora simba rechiratidzo chepombi ichi uye kusvetukira kunzvimbo yavo yekufara.Chikamu chechiratidzo chekubuda chemwenje chinodzvanywa uye kudzoserwa pakuiswa kwepombi laser kuburikidza neoptical sefa uye detector.Izvi zvinoshanda semhinduro yesimba rekudzora maitiro kuitira kugadzira maEDFA seanozvigadzirisa ega amplifiers.Kana ese maerekitironi metastable adyiwa saka hapana kumwe kukwidziridzwa kunoitika.Naizvozvo, iyo sisitimu inodzikama yega nekuti iyo inobuda optical simba reEDFA rinoramba rakagara risingaite zvisinei nekuchinja kwesimba rekuisa, kana iripo.

1.2 Yakareruka inoshanda schematic yeEDFA

Nhamba iri pamusoro inoratidza yakareruka inoshanda schematic yeEDFA umo chiratidzo chepombi kubva kune laser inowedzerwa kune yekuisa yekuona chiratidzo (pa1480 nm kana 980 nm) kuburikidza neWDM coupler.

Iyi dhizaini inoratidza yakakosha EDF amplifier.Kureba kwechiratidzo chepombi (ine simba repombi rinosvika 50 mW) i1480 nm kana 980 nm.Chimwe chikamu chechiratidzo chepombi ichi chinoendeswa kune inopinza chiratidzo chemaziso nekusimudzirwa kwekubuda mukati mehurefu hupfupi hweErbium-doped fiber.Iyo ine yakajairika Optical kuwana inosvika 5-15 dB uye isingasviki gumi dB ruzha nhamba.Kune 1550 nm oparesheni, zvinokwanisika kuwana 30-40 dB Optical kuwana.

1.3 Kuzadzikiswa kunoshanda kweEDFA

Mufananidzo uri pamusoro unoratidza kushanda kwakareruka kweEDFA ine maitiro ayo anoshanda kana ichishandiswa muWDM application.

Sezvakaratidzwa, inosanganisira zvikamu zvikuru zvinotevera:

• An isolator pakupinza.Izvi zvinochengetedza ruzha rwunogadzirwa neEDFA kubva pakupararira kusvika kumagumo ekutumira.

• A WDM coupler.Iyo inosanganisa yakaderera-simba 1550 nm optical yekupinza data siginecha ine yakakwirira-simba kupomba chiratidzo chemaziso (kubva papombi sosi senge laser) pa980 nm wavelength.

• Chikamu chidiki cheerbium-doped silica fiber.Muchokwadi, izvi zvinoshanda senge svikiro rinoshanda reEDFA.

• An isolator pane zvakabuda.Inobatsira kudzivirira chero kumashure-yakaratidza optical chiratidzo kubva kupinda erbium-doped silica fiber.

Chiratidzo chekupedzisira chekubuda ndeye yakawedzera 1550 nm wavelength optical data siginecha ine yasara 980 nm wavelength pombi chiratidzo.

Mhando dzeErbium-Doped Fiber Amplifiers (EDFAs)

Kune marudzi maviri ezvimiro zveErbium-Doped Fiber Amplifiers (EDFAs):

• EDFA pamwe neco-propagating pombi

• EDFA ine pombi inoparadzira inopikisa

Mufananidzo uri pazasi unoratidza pombi inopesana-inoparadzira uye bidirectional pombi marongero anogona kushandiswa muzvimiro zveEDFA.

Kurongeka kwepombi kwakasiyana

A co-propagating pombi EDFA inoratidzira yakaderera inobuda optical simba ine yakaderera ruzha;nepo pombi inoparadzira-inoparadzira EDFA inopa yakakwira kubuda simba rekuona asi ichiburitsa ruzha rwakakura zvakare.Muchinyakare chekutengesa EDFA, pombi ye-bi-directional ine panguva imwe chete ye-propagating uye counter-propagating pumping inoshandiswa iyo inoita kuti pave nemafungiro akafanana ekuona.

Kushandiswa kweEDFA se booster, in-line, uye pre-amplifier

Mukushandisa-kwenguva refu kweiyo optical fiber communication link, EDFAs inogona kushandiswa seyekusimudzira amplifier pakubuda kweiyo optical transmitter, in-line optical amplifier pamwe chete nefiber yemaziso pamwe ne-pre-amplifier nguva isati yasvika. mugamuchiri, sezvakaratidzwa mumufananidzo uri pamusoro.

Zvinogona kucherechedzwa kuti in-line EDFAs inoiswa pa20-100 km kure kure zvichienderana nekurasikirwa kwefiber.Chiratidzo chekupinza chemaziso chiri pa1.55 μm wavelength, nepo pombi lasers inoshanda pa1.48 μm kana 980 nm wavelength.Kureba kweErbium-doped fiber ndeye 10-50 m.

Amplification Mechanism muEDFAs

Sezvambotaurwa, nzira yekukwidziridza muEDFA yakavakirwa pakusimudzira kubuda kwakafanana nekwemu laser.Simba rakakwirira kubva pachiratidzo chepombi yepombi (inogadzirwa neimwe laser) inofadza iyo dopant erbium ions (Er3+) mu silica fiber panzvimbo yepamusoro yesimba.Iyo yekupinza yedata data chiratidzo inosimudzira shanduko yeiyo Erbium inonakidza ion kune yakaderera simba mamiriro uye inoguma nemwaranzi yemafotoni ane simba rimwechete, kureva, iyo yavelength yakafanana neyeiyo yekupinza chiratidzo chemagetsi.

Energy-level Diagram: Yemahara Erbium ion inoratidza discrete mazinga esimba bhendi.Kana Erbium ion ikadonhedzwa kuita silica faibha, imwe neimwe yesimba radzo inotsemuka kuita akati wandei mazinga ane hukama kuitira kuumba bhendi resimba.

1.4 Amplification mechanism muEDFA

Kuti uwane inversion yehuwandu hwevanhu, Er3 + ions inoputirwa pamwero wepakati 2. Nenzira isina kunanga (980-nm kupomba), Er3 + ions inoramba ichiendeswa kubva pazinga 1 kusvika padanho 3. Inoteverwa nekuora kusinga-radiatively kusvika padanho 2, kubva kwavanowira kunhanho 1, vachipenya zvikwangwani zvemaziso mune inodiwa wavelength ye1500-1600 nm.Izvi zvinozivikanwa se 3-level amplification mechanism.

Kuti uwane zvimwe zvigadzirwa zveErbium-doped, ndapota tarisa mune yedu webhusaiti.

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