Sabuwar ultra-high extinction rabo electro-optic modulator

Na baya-bayan nanultra-high extinction rabo electro-optic modulator

On-chip electro-optical modulators (tushen silicon, triquinoid, fim din lithium niobate na bakin ciki, da dai sauransu) suna da fa'idodin ƙaƙƙarfan ƙarfi, saurin gudu da ƙarancin wutar lantarki, amma har yanzu akwai manyan ƙalubalen don cimma canjin ƙarfin ƙarfi mai ƙarfi tare da rarrabuwa mai ƙarfi. Kwanan nan, masu bincike a wata cibiyar bincike ta hadin gwiwa ta Fiber Optic Sensing a wata jami'ar kasar Sin sun yi wani babban ci gaba a fannin na'ura mai kwakwalwa mai karfin gaske a kan na'urorin siliki. Dangane da babban tsari na tacewa na gani, silikon kan-chipelectrooptic modulatortare da bacewar rabo har zuwa 68 dB an gane shi a karon farko. Girman girma da amfani da wutar lantarki umarni biyu ne na girma fiye da na gargajiyaAOM modulator, kuma an tabbatar da yuwuwar aikace-aikacen na'urar a cikin tsarin DAS na dakin gwaje-gwaje.

Hoto 1 Tsarin tsari na na'urar gwaji don matsanancihigh extinction rabo electro-optic modulator

Silikon tushenelectro-Optical modulatorbisa tsarin tacewar microring mai haɗe-haɗe yana kama da matatar lantarki ta gargajiya. Modulator na electrooptic yana samun madaidaicin madaidaicin bandpass da ƙimar kin amincewa da babban bandeji (> 60 dB) ta hanyar haɗakarwa da na'urori na tushen microring na silicon guda huɗu. Tare da taimakon wani nau'in Pin-type electro-optical shifter a cikin kowane microring, za'a iya canza nau'in watsawa na modulator a ƙananan ƙarfin lantarki (<1.5 V). Maɗaukakin ƙidayar ƙidayar ƙungiya a haɗe tare da siffa mai tsauri ta tace mirgine-ƙasa yana ba da damar ƙarfin shigarwar hasken da ke kusa da tsayin raƙuman raƙuman ruwa da za a daidaita shi tare da babban bambanci, wanda ke da matuƙar dacewa ga samar da matsananci-high extinction rabo haske bugun jini.

Don tabbatar da ikon daidaitawa na na'ura mai amfani da wutar lantarki, ƙungiyar ta fara nuna bambancin watsa na'urar tare da wutar lantarki na DC a tsawon aiki. Ana iya ganin cewa bayan 1 V, watsawa ya ragu sosai fiye da 60 dB. Saboda iyakance hanyoyin lura da oscilloscope na al'ada, ƙungiyar bincike ta ɗauki hanyar auna katsalandan ta kai-heterodyne, kuma tana amfani da babban kewayon na'urar sikirin don siffata ƙwaƙƙwaran ɓarna mai ƙarfi na modulator yayin daidaita bugun bugun jini. Sakamakon gwaji ya nuna cewa bugun haske mai fitarwa na modulator yana da rabon ƙarewa har zuwa 68 dB, da ƙarancin ɓarna fiye da 65 dB kusa da wurare da yawa na resonant. Bayan cikakken lissafi, ainihin ƙarfin wutar lantarki na RF ɗin da aka ɗora wa lantarki ya kai kusan 1 V, kuma ikon daidaitawa shine kawai 3.6mW, wanda shine umarni biyu na girma fiye da na yau da kullun na AOM modulator ikon amfani.

Ana iya amfani da aikace-aikacen na'urar lantarki na tushen Silicon a cikin tsarin DAS zuwa tsarin ganowa kai tsaye ta DAS ta hanyar tattara na'urar modulator akan guntu. Daban-daban da na gama-gari na siginar gida-heterodyne interferometry, ana ɗaukar yanayin lalata mara daidaituwa na tsaka-tsakin tsaka-tsakin Michelson a cikin wannan tsarin, ta yadda ba a buƙatar tasirin canjin mitar na gani na modulator ba. Canje-canjen lokaci da siginar girgizar sinusoidal ya haifar an sami nasarar dawo da su ta hanyar lalata siginonin Rayleigh da aka watsar na tashoshi 3 ta amfani da algorithm demodulation na IQ na al'ada. Sakamakon ya nuna cewa SNR yana kusan 56 dB. Ana ci gaba da bincika rarrabawar ƙarfin siginar wutar lantarki tare da tsawon tsawon firikwensin firikwensin a cikin kewayon mitar sigina ± 100 Hz. Bayan fitaccen sigina a wurin girgizawa da mitar, ana lura da cewa akwai wasu martanin siginar ƙarfi a wasu wurare na sarari. Ƙaƙwalwar ƙararrawa a cikin kewayon ± 10 Hz kuma a waje da matsayi na rawar jiki yana daidaitawa tare da tsawon fiber, kuma matsakaicin SNR a cikin sararin samaniya bai kasa da 33 dB ba.

Hoto 2

zane-zane na tsarin filaye masu rarraba sauti na gani.

b Ƙarfin sigina mai ƙarfi mai yawa.

c, d mitocin jijjiga kusa da rarrabawar yawan ƙarfin wutar lantarki tare da fiber mai ji.

Wannan binciken shi ne na farko da ya cimma na'urar modulator na lantarki a kan silicon tare da ultra-high extinction ratio (68 dB), kuma an yi nasarar amfani da shi zuwa tsarin DAS, kuma tasirin amfani da na'ura na AOM na kasuwanci yana da kusanci sosai, kuma girman da amfani da wutar lantarki umarni biyu ne na girma fiye da na karshen, wanda ake sa ran zai taka muhimmiyar rawa a cikin tsararraki na gaba na ƙananan tsarin rarraba. Bugu da ƙari, babban tsarin masana'antu na CMOS da ikon haɗin kan-chip na tushen siliconoptoelectronic na'urorinna iya haɓaka haɓakar sabon ƙarni na ƙarancin farashi, na'urori masu haɗaɗɗiyar haɗaɗɗiyar na'urori da yawa dangane da tsarin sarrafa fiber rarraba guntu.