Silicon optical modulator maka FMCW

Silicon optical modulatormaka FMW

Dị ka anyị niile maara, otu n'ime ihe kachasị mkpa na sistemụ Lidar dabeere na FMCW bụ modulator linearity dị elu. E gosipụtara ụkpụrụ ọrụ ya na foto a: IjiDP-IQ modulatordabereModulation otu sideband (SSB), elu na alaMZMna-arụ ọrụ na null point, n'okporo ụzọ na ala n'akụkụ akụkụ nke wc + wm na WC-WM, wm bụ ugboro ugboro modulation, ma n'otu oge ahụ, ọwa ala na-ewebata 90 degrees nkeji ọdịiche, na n'ikpeazụ ìhè nke WC-WM. A kagbuola, naanị oge ngbanwe ugboro nke wc+wm. Na eserese b, LR-acha anụnụ anụnụ bụ mgbama FM chirp mpaghara, oroma RX bụ akara ngosi na-egosipụta, na n'ihi mmetụta Doppler, akara akara ikpeazụ na-emepụta f1 na f2.

Ebe dị anya na ọsọ bụ:

Ihe na-esonụ bụ akụkọ nke Mahadum Shanghai Jiaotong bipụtara na 2021, gbasaraSSBndị na-emepụta ihe na-eme FMCW dabere namodul ndị na-enwu ọkụ silicon.

E gosipụtara arụmọrụ nke MZM dị ka ndị a: Ihe dị iche iche arụmọrụ nke ndị modulators dị elu na nke ala dị ntakịrị. Oke njụta ​​nke sideband nke ụgbọelu dị iche na ọnụego mgbanwe ugboro ugboro, nsonaazụ ya ga-akawanye njọ ka ugboro na-abawanye.

Na ọnụ ọgụgụ na-esonụ, ule nyocha nke usoro Lidar na-egosi na a / b bụ akara akara n'otu ọsọ na n'ebe dị anya, na c / d bụ ​​akara akara n'otu ebe dị anya na ọsọ dị iche iche. Nsonaazụ ule ruru 15mm na 0.775m/s.

Ebe a, naanị ngwa nke siliconngwa anya modulatorn'ihi na FMCW na-atụle. N'ezie, mmetụta nke silicon optical modulator adịghị mma dị ka nkeLiNO3 modulator, tumadi n'ihi na silicon optical modulator, usoro mgbanwe / absorption coefficient / junction capacitance na-abụghị linear na voltaji mgbanwe, dị ka e gosiri na foto n'okpuru:

Ya bụ,

Mmekọrịta ike mmepụta nkemodulatorusoro bụ dị ka ndị a
Ihe si na ya pụta bụ ntọhapụ n'usoro dị elu:

Ndị a ga-eme ka ịgbasa mgbama ugboro iti na mbelata nke ogo mgbama na-mkpọtụ. Yabụ kedu ụzọ isi meziwanye linearity nke modulator ọkụ silicon? N'ebe a, anyị na-atụle naanị njirimara nke ngwaọrụ ahụ n'onwe ya, ma ghara iji usoro inyeaka ndị ọzọ atụle atụmatụ ịkwụ ụgwọ.
Otu n'ime ihe ndị mere na-abụghị linearity nke modulation na-adọ na voltaji bụ na ìhè ubi na waveguide bụ dị iche iche nkesa nke arọ na ìhè paramita na usoro mgbanwe ọnụego dị iche iche na mgbanwe nke voltaji. Dị ka e gosiri na foto na-esonụ. Mpaghara nkwụsị nke nwere nnukwu nnyonye anya na-agbanwe na-erughị nke na nnyonye anya ọkụ.

Ọnụọgụ na-esonụ na-egosi mgbanwe mgbanwe nke usoro nke atọ intermodulation distortion TID na nke abụọ harmonic distortion SHD na ntinye nke mgbagwoju anya, ya bụ, ugboro modulation. Enwere ike ịhụ na ikike nkwụsị nke nhụsianya maka nhụsianya dị arọ dị elu karịa nke ahụ maka ọkụ ọkụ. Ya mere, remixing na-enyere aka melite linearity.

Nke a dị n'elu bụ ịtụle C na ụdị RC nke MZM, na mmetụta nke R kwesịkwara ịtụle. Ihe na-esonụ bụ mgbanwe mgbanwe nke CDR3 nwere usoro nguzogide. Enwere ike ịhụ na obere nguzogide usoro ahụ, ka CDR3 buru ibu.

N'ikpeazụ ma ọ dịghị ihe ọzọ, mmetụta nke silicon modulator adịchaghị njọ karịa nke LiNbO3. Dị ka e gosiri na foto dị n'okpuru ebe a, CDR3 nkesilicon modulatorga-adị elu karịa nke LiNbO3 n'ihe gbasara echiche zuru oke site na nhazi ezi uche nke nhazi na ogologo nke modulator. Ọnọdụ ule na-agbanwe agbanwe.

Na nchịkọta, ihe nhazi nke modulator ọkụ silicon nwere ike ibelata, ọ bụghị ọgwụgwọ, yana ma enwere ike iji ya mee ihe na usoro FMCW chọrọ nkwenye nnwale, ọ bụrụ na ọ nwere ike ịbụ n'ezie, mgbe ahụ ọ nwere ike nweta ntinye nke transceiver, nke nwere uru. maka nnukwu ọnụ ahịa mbelata.