Dab tsi yog optocoupler?

Optical couplers yog cov khoom siv passive uas sib cais, sib xyaw, thiab faibkho qhov muagteeb liab. Lawv yog cov khoom siv kho qhov muag tsis tseem ceeb hauv kev sib faib wavelength multiplexing, fiber ntau optic hauv cheeb tsam network, fiber ntau optic cable TV network, thiab qee yam ntsuas ntsuas. Ntau cov qauv fiber ntau optic txuas tau pom hauv daim duab.

optocoupler

4-chaw nres nkoj optocoupler yog hom khoom siv yooj yim tshaj plaws. Cov qauv thiab lub hauv paus ntsiab lus ntawm 4-chaw nres nkoj optocoupler tau qhia hauv daim duab.

(1) Insertion poob
Insertion poob yog hais txog qhov sib piv ntawm lub zog kho qhov muag ntawm ib qho chaw nres nkoj tshwj xeeb ntawm cov tswv yim kawg rau lub zog kho qhov muag ntawm lwm qhov chaw nres nkoj ntawm qhov tso zis kawg tom qab lub teeb dhau los ntawm lub cuab yeej. Qhov kev poob qis los ntawm qhov chaw nres nkoj nkag mus rau qhov chaw nres nkoj tso zis yog qhia raws li

L_i=10 log (P_out / P_in) (3-31)

(2) Kev poob ntxiv
Kev poob ntxiv L_a txhais tau tias yog qhov piv ntawm tag nrho cov tswv yim zog rau tag nrho cov zis hluav taws xob. Raws li pom nyob rau hauv Equation 3-32 rau 4-chaw nres nkoj optical coupler,

L_a=10 log (P_in / (P_1 + P_2)) (3-32)

(3) Sib piv piv
Qhov sib faib piv yog ib feem pua uas qhia txog qhov piv ntawm cov hluav taws xob kho qhov muag tawm ntawm ib qho chaw nres nkoj mus rau tag nrho cov hluav taws xob kho qhov muag tawm ntawm txhua qhov chaw nres nkoj. Nws qhia txog qhov kev faib ua feem ntawm cov khoom siv hluav taws xob ntawm cov chaw tso zis. Rau 4-chaw nres nkoj optical coupler, nws tuaj yeem qhia tau tias

S_n = (P_2 / (P_1 + P_2)) × 100% (3-33)

(4) Kev cais tawm
Kev rho tawm yog hais txog kev muaj peev xwm los thaiv lossis txo txoj kev kho qhov muag ntawm qhov tsis yog - cov chaw nres nkoj txuas. Nws qhia tau hais tias lub zog tso zis ntawm qhov xav tau qhov chaw nres nkoj yog ntau dua li ntawm qhov tsis xav tau qhov chaw nres nkoj. Rau 4-chaw nres nkoj optical coupler, nws txoj kev qhia lej yog

L_g=-10 log (P_2 / P_in) (3-34)

Daim duab qauv ntawm lub cev ntawm peb -chaw nres nkoj optical coupler tau pom hauv daim duab.

Kev ua haujlwm ntawm lub tshuab kho qhov muag yog los xyuas kom meej tias lub teeb tsis muaj peev xwm tsuas yog nthuav tawm nyob rau hauv kev taw qhia pem hauv ntej, tiv thaiv lub teeb pom kev los ntawm ntau yam hauv cov kab sib kis los ntawm re- nkag mus rau lub laser thiab cuam tshuam rau lub laser kev ua haujlwm ruaj khov.

Optical isolators feem ntau yog siv tom qab lasers lossis optical amplifiers. Lasers thiab optical amplifiers yog rhiab heev rau lub teeb pom kev los ntawm cov khoom sib txuas, splices, thiab lim. Qhov teeb pom kev zoo no tuaj yeem ua rau lawv qhov kev ua tau zoo; Piv txwv li, qhov dav spectral ntawm lub laser tuaj yeem nthuav dav lossis nqaim los ntawm lub teeb pom kev, qee zaum los ntawm ntau qhov kev txiav txim siab. Yog li ntawd, lub optical isolator yuav tsum tau muab tso rau ze ntawm qhov tso zis ntawm cov khoom siv kho qhov muag kom tiv thaiv cov teebmeem ntawm lub teeb pom kev.

Cov kev ua tau zoo tseem ceeb ntawm lub tshuab kho qhov muag muaj xws li kev khiav hauj lwm wavelength, raug tso tawm tsis zoo (tus nqi siv: 0.4 dB), qhov siab tshaj qhov nkag (siv tus nqi: 0.6 dB), kev sib cais siab tshaj plaws, kev sib cais yam tsawg kawg nkaus (tus nqi siv: 40 dB), thiab rov poob (piv txwv li, kev xav poob, siv tus nqi 0.6 / 0.

Optical circulators thiab optical isolators ua haujlwm ntawm tib lub hauv paus ntsiab lus, tshwj tsis yog tias optical isolators feem ntau yog ob-chaw nres nkoj li, thaum kho qhov muag circulators muaj ntau-chaw nres nkoj cov khoom siv. Optical circulators yog cov khoom tseem ceeb hauv kev sib txuas lus bidirectional, vim tias lawv tuaj yeem cais lub teeb xa mus rau pem hauv ntej thiab rov qab, thiab siv rau hauv ib qho - fiber ntau kev sib txuas lus. Daim duab schematic ntawm ib qho khoom siv kho qhov muag tau pom ntawm sab laug, thiab daim duab schematic ntawm lub tshuab kho qhov muag siv hauv ib zaug -fiber bidirectional kev sib txuas lus tau pom ntawm sab xis.

Lub wavelength converter yog ib lub cuab yeej uas hloov lub teeb liab ntawm ib lub wavelength mus rau lwm qhov. Wavelength converters tuaj yeem muab faib ua optoelectronic wavelength converters thiab tag nrho -optical wavelength converters raws li lawv lub wavelength converters.

⑴

Lub optoelectronic wavelength converter yog qhia nyob rau hauv daim duab. Vim muaj kev txwv ceev los ntawm cov khoom siv hluav taws xob, nws tsis haum rau siab - nrawm, siab - muaj peev xwm fiber ntau optic kev sib txuas lus.

⑵

Tag nrho - optical wavelength converter yog qhia hauv daim duab 3-38. Nws lub wavelength conversion tshuab feem ntau muaj xws li semiconductor optical amplifier (SOA).

Lub teeb liab teeb liab nrog wavelength λ₁ thiab lub teeb liab teeb liab txuas ntxiv nrog wavelength λ₂ yog ib txhij pub rau hauv semiconductor optical amplifier (SOA). Lub SOA nthuav tawm tau txais cov yam ntxwv saturation nrog rau cov tswv yim kho qhov muag. Raws li qhov tshwm sim, cov ntaub ntawv nqa los ntawm lub teeb liab teeb liab nkag mus rau λ₂, thiab los ntawm kev rho tawm lub teeb liab λ₂ los ntawm lub lim, tag nrho - optical wavelength conversion ntawm λ₁ mus rau λ₂ tuaj yeem ua tiav.