Silicon Optical Modulator na FMCW

Silicon Optical Modulatordon FMW

Kamar yadda muka sani, ɗayan mahimman abubuwan haɗin gwiwa a cikin tsarin Lidar na tushen FMCW shine babban mai daidaita layin layi. An nuna ƙa'idar aikin sa a cikin adadi mai zuwa: AmfaniDP-IQ modulatortushenModulation na gefe guda ɗaya (SSB), babba da ƙasaMZMaiki a null point, a kan hanya da ƙasa gefen band na wc + wm da WC-WM, wm shine mitar daidaitawa, amma a lokaci guda ƙananan tashar ta gabatar da bambance-bambancen digiri na 90, kuma a ƙarshe hasken WC-WM an soke, kawai lokacin sauya mitar wc+wm. A cikin Hoto b, LR blue shine siginar FM chirp na gida, RX orange shine siginar da ake nunawa, kuma saboda tasirin Doppler, siginar bugun ƙarshe yana haifar da f1 da f2.

Nisa da gudun su ne:

Mai zuwa labarin ne da Jami'ar Shanghai Jiaotong ta buga a cikin 2021, game daSSBjanareta da ke aiwatar da FMCW bisasiliki haske modulators.

Ana nuna aikin MZM kamar haka: Bambance-bambancen aiki na manyan na'urori masu daidaitawa na hannu yana da girma. Matsakaicin ƙin yarda da bandeji mai ɗaukar kaya ya bambanta da mitar daidaitawa, kuma tasirin zai yi muni yayin da mitar ke ƙaruwa.

A cikin wannan adadi mai zuwa, sakamakon gwajin na tsarin Lidar ya nuna cewa a/b shine siginar bugun a cikin gudu iri ɗaya da nisa daban-daban, kuma c/d ita ce siginar bugun a nesa ɗaya da gudu daban-daban. Sakamakon gwajin ya kai 15mm da 0.775m/s.

A nan, kawai aikace-aikacen siliconna gani modulatordon FMCW an tattauna. A hakikanin gaskiya, tasirin siliki na gani na gani ba shi da kyau kamar naLiNO3 modulator, galibi saboda a cikin modulator na gani na silicon, canjin lokaci / shayarwa coefficient / junction capacitance ba na layi ba tare da canjin wutar lantarki, kamar yadda aka nuna a cikin adadi na ƙasa:

Wato,

Alakar ikon fitarwa namai daidaitawatsarin shine kamar haka
Sakamakon shine babban oda:

Waɗannan za su haifar da faɗaɗa siginar bugun bugun da rage siginar-zuwa amo. Don haka menene hanyar inganta layin siliki na modulator haske? Anan muna magana ne kawai game da halayen na'urar kanta, kuma kada muyi magana game da tsarin ramuwa ta amfani da wasu sifofi masu taimako.
Ɗaya daga cikin dalilan rashin daidaituwa na lokacin daidaitawa tare da ƙarfin lantarki shine cewa filin haske a cikin waveguide yana cikin rarraba daban-daban na nauyin nauyi da haske kuma canjin lokaci ya bambanta da canjin wutar lantarki. Kamar yadda aka nuna a hoto mai zuwa. Yankin raguwa tare da tsangwama mai nauyi yana canzawa ƙasa da wannan tare da tsangwama mai haske.

Hoton da ke gaba yana nuna sauye-sauyen madaidaicin tsari na uku na murdiya intermodulation TID da kuma na biyu na daidaitawa na SHD tare da maida hankali na clutter, wato, mitar daidaitawa. Ana iya ganin cewa ikon dannewa na detuning don nauyi mai nauyi ya fi girma fiye da wannan don ƙullun haske. Saboda haka, remixing yana taimakawa wajen inganta layi.

Abin da ke sama yana daidai da la'akari da C a cikin tsarin RC na MZM, kuma ya kamata a yi la'akari da tasirin R. Mai zuwa shine canjin canjin CDR3 tare da juriya na jerin. Ana iya ganin cewa ƙarami juriya na jerin, ya fi girma CDR3.

A ƙarshe amma ba kalla ba, tasirin na'urar modulator ba lallai ba ne ya yi muni fiye da na LiNbO3. Kamar yadda aka nuna a cikin hoton da ke ƙasa, CDR3 nasilicon modulatorzai kasance mafi girma fiye da na LiNbO3 a cikin yanayin cikakken son rai ta hanyar ƙira mai ma'ana na tsari da tsawon na'ura mai kwakwalwa. Yanayin gwaji ya kasance daidai.

A taƙaice, za a iya rage tsarin ƙirar na'urar hasken siliki kawai, ba a warkewa ba, kuma ko da gaske za a iya amfani da shi a cikin tsarin FMCW yana buƙatar tabbatarwa na gwaji, idan yana iya zama da gaske, to zai iya cimma haɗin kai na transceiver, wanda ke da fa'ida. don rage yawan farashi.