Ihe modulator electro-optic kachasị ọhụrụ nke na-ebelata oke mbibi

Ihe kachasị ọhụrụihe na-eme ka electro-optic modulator dị oke elu

Ihe ndị na-eme ka electro-optical modulators dị na chip (nke dabere na silicon, triquinoid, thin film lithium niobate, wdg) nwere uru nke obere ihe, ọsọ dị elu na obere ike oriri, mana enwere nnukwu ihe ịma aka iji nweta mgbanwe ike na oke mkpochapu dị elu. N'oge na-adịbeghị anya, ndị nchọpụta na otu nnyocha Center for Fiber Optic Sensing na mahadum China emeela nnukwu ọganihu n'ọhịa nke electro-optical modulators dị elu na silicon substrates. Dabere na nhazi nzacha optical dị elu, silicon dị na chipihe na-eme ka electro-optic modulator dịA na-enweta oke mbibi ruo 68 dB maka oge mbụ. Nha na oriri ike dị obere karịa nke ọdịnala.Ihe nhazi AOM, a na-enyochakwa ohere ojiji nke ngwaọrụ ahụ na sistemụ DAS nke ụlọ nyocha.

Foto 1. Eserese eserese nke ngwaọrụ nnwale maka ultramodulator electro-optic nke nwere oke mkpochapu dị elu

Ihe e ji silik meeihe na-eme ka ihe na-arụ ọrụ elektrọnik rụọ ọrụDabere na nhazi nzacha microring ejikọtara yiri nke nzacha eletriki oge gboo. Igwe ihe nhazi electro-optic na-enweta nzacha bandpass dị larịị na oke njụ nke silkọn (>60 dB) site na njikọ usoro nke resonators microring anọ dabere na silicon. Site n'enyemaka nke mgbanwe usoro electro-optical ụdị Pin na microring ọ bụla, enwere ike ịgbanwe ụdị transmittance nke modulator nke ukwuu na voltaji dị ala etinyere (<1.5 V). Oke njụ nke si band jikọtara ya na njirimara mpịakọta steepụ na-eme ka ike nke ọkụ ntinye dị nso na ogologo oge resonant gbanwee ya na nnukwu ọdịiche, nke na-enyere aka nke ukwuu na mmepụta nke oke ngwụcha oke ọkụ.

Iji chọpụta ikike mgbanwe nke electro-optic modulator, ndị otu ahụ buru ụzọ gosipụta mgbanwe nke nnyefe nke ngwaọrụ ahụ na voltaji DC na ogologo oge ọrụ. A pụrụ ịhụ na mgbe 1 V gasịrị, nnyefe ahụ na-ada nke ọma karịa 60 dB. N'ihi mmachi nke ụzọ nlele oscilloscope ọdịnala, ndị otu nyocha ahụ na-anabata usoro nha nnyonye anya onwe-heterodyne, ma jiri nnukwu oke ike nke spectrometer iji mara oke mbibi ike dị elu nke modulator n'oge mgbanwe pulse. Nsonaazụ nnwale ahụ na-egosi na ọkụ ọkụ mmepụta nke modulator nwere oke mbibi nke ruru 68 dB, yana oke mbibi nke karịrị 65 dB nso ọtụtụ ọnọdụ ogologo oge resonant. Mgbe agbakọchara nke ọma, voltaji draịva RF nke e tinyere na electrode bụ ihe dị ka 1 V, oriri ike mgbanwe bụ naanị 3.6 mW, nke bụ usoro abụọ nke nha dị obere karịa oriri ike modulator AOM nkịtị.

Enwere ike itinye usoro modulator electro-optic nke Silicon dabere na sistemụ DAS na sistemụ nchọpụta ozugbo site na ịtinye modulator on-chip. N'adịghị ka interferometry mpaghara-mgbaàmà heterodyne, a na-anabata ụdị demodulation nke interferometry Michelson na-enweghị nhazi na sistemụ a, nke mere na mmetụta mgbanwe ugboro ole anya nke modulator adịghị mkpa. A na-eweghachi mgbanwe nke usoro nke mgbaàmà vibration sinusoidal kpatara site na demodulation nke Rayleigh gbasaara nke ọwa atọ site na iji algọridim demodulation IQ nkịtị. Nsonaazụ ya na-egosi na SNR dị ihe dị ka 56 dB. A na-enyocha nkesa nke njupụta spectral ike n'ogologo ogologo eriri sensọ n'ogo ugboro ugboro ±100 Hz. E wezụga akara a ma ama na ọnọdụ na ugboro ugboro, a na-ahụ na enwere ụfọdụ nzaghachi njupụta spectral ike na ebe ndị ọzọ dị n'ime oghere. A na-agbakọ mkpọtụ crosstalk na oke nke ±10 Hz na n'èzí ọnọdụ vibration n'ogologo eriri ahụ, SNR nkezi na oghere abụghị ihe na-erughị 33 dB.

Foto nke 2

eserese eserese nke sistemụ mmetụta acoustic nke eriri optical kesara.

b Ike mgbaàmà nke e wedara njupụta spectral.

c, d ugboro mkpọtụ dị nso na nkesa njupụta ike spectral n'akụkụ eriri mmetụta.

Ọmụmụ ihe a bụ nke mbụ e nwetara ihe na-eme ka electro-optical modulator dị na silicon nke nwere oke mkpochapu dị elu (68 dB), ma tinye ya nke ọma na sistemụ DAS, mmetụta nke iji ihe na-eme ka AOM modulator azụmahịa dị nnọọ nso, nha na oriri ike dịkwa obere karịa nke ikpeazụ, nke a na-atụ anya na ọ ga-arụ ọrụ dị mkpa na ọgbọ ọzọ nke sistemụ mmetụta eriri kesara obere ike. Na mgbakwunye, usoro mmepụta CMOS buru ibu na ikike njikọta na-agba ọsọ nke dabere na silicon.ngwaọrụ optoelectronicnwere ike ịkwalite mmepe nke ọgbọ ọhụrụ nke modulu monolithic agbakwunyere dị ọnụ ala, nke nwere ọtụtụ ngwaọrụ dabere na sistemụ sensọ eriri kesara na chip.