Kamfanin Turanci na Foton

Takardar da Optical Modulation

Optical modulation yana wani abu na iya gina wasu dabbobi don harshe masu magance. Wadannan dabbobi suna tattara tun daga fadin zafi ko kuma tun daga ciki optical fiber cable.

Ko da yake, optical modulation yana nufin tsarin gina electrical signal da ke da bayanai zuwa optical signal. Wannan tsari yana taimaka wajen tabbatar da bayanai a kan karfin da ya fi shiga da kyau.

Fundamentally, akwai biyu na hanyoyi na gine optical signals, wadannan suka girma:

Direct Modulation

A matsayin sunan, direct modulation yana nufin tsarin da ake amfani da ita wadanda ake amfani da ita don gyara bayanai zuwa harshe masu magance. A wannan hikimomi, current na laser (wanda yake mahaifi) yana canzawa ta hanyar electrical information signal. Wannan canzanar current yana haɗa da canzanar optical power signal, ba a buƙata da optical modulators masu wahala.

Amma, wannan tsarin yana da batun da suka faru. Su ne da muhimmanci wadda suna da shawarwar carrier lifetimes of spontaneous and stimulated emission, da kuma photon lifetime of the light source. Idan ake amfani da laser transmitter don direct modulation, linewidth na laser yana fi yawa, wanda ake kira chirp. Wannan yawan linewidth na laser yana yi nasara wajen amfani da direct modulation, tare da data rates da suka karkashin 2.5 Gbps.

External Modulation

Na farko, external modulation yana amfani da optical modulators masu inganci don gyara optical signals da kuma alowa su. Wannan tsari yana da muhimmanci wajen gyara signals da suka karkashin 10 Gbps. Idan ya fi shiga da high-speed data, ba a buƙata da ake amfani da external modulation kawai saboda data rates masu karkashi; zan iya amfani da ita a wurare na musamman.

Wannan takarda yana nuna yadda external modulator yake yi aiki, da kuma yadda yake iya gyara optical signal don samun tsari mai kyau.

External Modulation Details

A cikin setup na external modulation, mahaifi ce muka shahara shine laser diode. Ba laser diode, an yi optical modulator circuit. Wannan circuit yana gyara harshe masu magance da ake fito daga mahaifi hanyar electrical signal da ake fito.

Laser diode yana haɗa da optical signal da yake da amplitude mai zurfi. Saboda haka, idan electrical signal yana haɗa da power level na optical output. Duk da haka, a cikin output na modulator, an samu optical signal mai varyansu lokaci, wanda yake da bayanai da ake fito daga electrical input.

Yana da kyau a duba cewa circuitry na external modulator zan iya haɗa da mahaifi, zai iya haɗa da optical source, zai iya bincika a solution mai kyau. Ko kuma zan iya haɗa da device mai mahimmanci, wanda zai taimaka wajen design da integration na system.

Optical modulators, wadanda suka shahara a cikin external modulation, ana girma biyu na hanyoyi:

Electro-Optical Phase Modulator

Wannan type na optical modulator yana nufin Mach-Zehnder Modulator, wanda ake amfani da lithium niobate a matsayin material fundamental. Properties na lithium niobate yana taimaka wajen gyara optical signal hanyar electrical inputs. Wannan takarda yana nuna yadda electro-optical external modulator yake yi aiki, da kuma yadda yake iya gyara optical signal.

Electro-Optical Phase Modulator Operation

A cikin electro-optical phase modulator, beam splitter da beam combiner suka shahara wajen gyara light waves. Idan optical signal yana samu a cikin modulator, beam splitter yana divide light beam zuwa biyu na equal parts, wanda suka tura zuwa paths na doka. Duk da haka, electric signal yana gyara phase na light beam wanda yake tura a cikin path na biyu.

Ba a tafara paths na doka, biyu na light waves suka samu a cikin beam combiner, wanda suka recombine. Wannan recombination zan iya faru a biyu na hali: constructively ko destructively. Idan constructive recombination yana faru, combined light waves zai reinforce each other, zai samu bright light wave a output na modulator, wanda ake represent pulse 1. Amma, idan destructive recombination yana faru, biyu na light beam zai cancel each other out, ba zai samu light signal a output, wanda ake represent pulse 0.

Electro-Absorption Modulator

Electro-absorption modulator yana amfani da indium phosphide. A wannan type na modulator, electrical signal da ke da bayanai yana gyara properties na material wanda light yana tura. Duk da haka, pulse 1 ko 0 zai samu a output.

Notably, electro-absorption modulator zan iya haɗa da laser diode da kuma butterfly package. Wannan integrated design yana taimaka wajen reduce overall space requirements, optimize power consumption, da kuma lower voltage demands, zai taimaka wajen amfani a optical communication applications.