Cov yam ntxwv thiab kev siv ntawm fiber ntau -doped amplifiers

Qhov nce coefficient g(z) muaj feem xyuam rau qhov sib txawv ntawm cov khoom sib txawv ntawm cov qib siab zog thiab qib qis zog thiab lub zog twj tso kua mis. Los ntawm kev sib koom ua ke qhov nce coefficient g(z) dhau tag nrho qhov ntev ntawm erbium-doped fiber, qhov nce GE ntawm fiber ntau-dopedfiber ntau amplifiertuaj yeem tau. Yog li ntawd, qhov nce ntawm lub amplifier yuav tsum muaj feem xyuam nrog lub twj tso kua mis siv thiab qhov ntev ntawm cov fiber ntau.

Lub g-nyob rau hauv nkhaus ntawm erbium-doped silicon fiber yog qhia nyob rau hauv daim duab 3-27. Nws tuaj yeem pom los ntawm daim duab tias qhov nce coefficient sib txawv nrog cov wavelengths sib txawv.
Optical fiber muaj bandwidth ntawm 200nm hauv 1.55μm qis- thaj tsam poob, thaum tam sim no siv EDFA nce bandwidth tsuas yog li 35nm.

Ntau daim ntawv thov ntawm optical amplifiers tau pom hauv daim duab. Nyob ntawm qhov chaw ntawm lub optical amplifier nyob rau hauv qhov txuas kho qhov muag, nws daim ntawv thov tuaj yeem muab faib ua 3 hom:

 

 

(1) EDFA yog siv los ua ib txoj kab amplifier. EDFA yog siv los ua ib kab amplifier.

Kab amplifier yog ib daim ntawv thov tseem ceeb hauv kev sib txuas lus fiber ntau optical. Hauv ib qho - hom kev sib txuas lus kho qhov muag fiber ntau, qhov cuam tshuam ntawm fiber ntau muaj qhov cuam tshuam me me. Qhov tseem ceeb tshaj plaws txwv qhov kev ncua deb yog qhov attenuation ntawm cov fiber ntau optical, yog li cov khoom siv kho qhov muag tuaj yeem siv los them nyiaj rau qhov tsis sib kis. Nws yog tsim rau ultra- kis tau tus mob nyob deb, raws li qhia hauv daim duab.

(2) EDFA yog siv los ua preamplifier

Vim lub suab nrov qis ntawm EDFA, nws yog qhov tsim nyog siv los ua qhov kawg ntawm lub receiver.
amplifier. Preamplification yog hais txog txoj hauj lwm ntawm optical amplifier nyob rau hauv qhov kawg ntawm qhov kev sib txuas ntawm optical fiber thiab ua ntej lub receiver, raws li qhia nyob rau hauv daim duab. Amplifying tsis muaj zog cov cim ua ntej lub photodetector suppresses lub teeb liab - mus rau - suab nrov piv degradation tshwm sim los ntawm thermal suab nyob rau hauv lub receiver.

(3) EDFA yog siv los ua lub zog amplifier

Lub hwj chim amplifier tso EDFA ncaj qha tom qab lub optical transmitter kom lub zog tso zis ntau zog. Raws li pom nyob rau hauv daim duab, nws feem ntau tuaj yeem nce qhov kev ncua deb ntawm 10 mus rau 100 km. Yog tias siv lub preamplifier tib lub sijhawm, 200-250km tsis-relay submarine kis tau tus mob. Txij li thaum lub hwj chim amplifier muab tso ncaj qha rau hauv qab ntawm optical transmitter, nws lub zog input yog siab dua thiab lub zog twj tso kua mis yuav tsum siab dua. Nws cov tswv yim feem ntau yog siab dua -8dBm, thiab nws qhov nce yuav tsum siab dua 5dB.