Silicon optical modulator yeFMCW

Silicon optical modulatoryeFMCW

Sezvatinoziva tese, chimwe chezvinhu zvakakosha muFMCW-based Lidar systems ihigh linearity modulator. Nheyo yayo yekushanda inoratidzwa mumufananidzo unotevera: Kushandisamodulator yeDP-IQzvakavakirwa pamodulation yebhendi rimwe chete (SSB), yepamusoro nepazasiMZMkushanda pa null point, mumugwagwa uye pasi pebhendi repadivi re wc+wm ne WC-WM, wm ndiyo modulation frequency, asi panguva imwe chete iyo lower channel inoburitsa 90 degrees phase difference, uye pakupedzisira chiedza che WC-WM chinodzimwa, chete frequency shift term ye wc+wm. MuMufananidzo b, LR blue ndiyo local FM chirp signal, RX orange ndiyo reflective signal, uye nekuda kweDoppler effect, final beat signal inogadzira f1 ne f2.

Daro nekumhanya ndeizvi:

Nyaya inotevera yakaburitswa neShanghai Jiaotong University muna 2021, inotaura nezveSSBmajenareta anoshandisa FMCW zvichibva pamodulator dzemwenje dzesilicon.

Kushanda kweMZM kunoratidzwa seizvi: Musiyano wekushanda kwemamodulators ekumusoro nepasi eruoko wakakura. Chiyero chekuramba divi remubatiri chakasiyana nechiyero chemodulation yefrequency, uye mhedzisiro yacho icharamba ichiipa sezvo frequency ichiwedzera.

Mumufananidzo unotevera, mhinduro dzebvunzo dzeLidar system dzinoratidza kuti a/b chiratidzo chekurova chiri pakumhanya kumwe chete uye padaro rakasiyana, uye c/d chiratidzo chekurova chiri padaro rimwe chete uye padaro rakasiyana. Mhinduro dzebvunzo dzakasvika 15mm ne0.775m /s.

Pano, kushandiswa kwesilicon chetemodulator yemazisoyeFMCW inokurukurwa. Muchokwadi, mhedzisiro yesilicon optical modulator haina kunaka seyeLiNO3 modulator, kunyanya nekuti mu silicon optical modulator, phase change/absorption coefficient/junction capacitance haina kurongeka nekuchinja kwevoltage, sezvakaratidzwa mumufananidzo uri pazasi:

Kureva kuti,

Hukama hwesimba rinobuda remodulatorsisitimu iyi ndeiyi inotevera
Mhedzisiro yacho inyaya yekudzikamisa zvinhu zvakanyanya:

Izvi zvichakonzera kuwedzera kwechiratidzo che beat frequency uye kudzikira kwechiratidzo-kune-ruzha. Saka ndeipi nzira yekuvandudza linearity yesilicon light modulator? Pano tinongokurukura hunhu hwemudziyo pachawo, uye hatikurukure nezve compensation scheme tichishandisa mamwe maumbirwo ekuwedzera.
Chimwe chezvikonzero zvekusaenderana kwechikamu che modulation ne voltage ndechekuti nzvimbo yechiedza mu waveguide ine kugoverwa kwakasiyana kwe heavy ne light parameters uye phase change rate yakasiyana nekuchinja kwe voltage. Sezvinoratidzwa mumufananidzo unotevera. Nzvimbo ye depletion ine heavy interference inochinja zvishoma pane iyo ne light interference.

Mufananidzo unotevera unoratidza macurve ekuchinja kwe third-order intermodulation distortion TID uye second-order harmonic distortion SHD nekuwanda kwe clutter, kureva kuti, modulation frequency. Zvinogona kuonekwa kuti kugona kwekudzora kwe detuning ye heavy clutter kwakakwira kupfuura kwe light clutter. Nokudaro, remixing inobatsira kuvandudza linearity.

Zviri pamusoro apa zvakaenzana nekufunga nezveC muRC model yeMZM, uye simba reR rinofanirawo kufungwa nezvaro. Inotevera ndiyo change curve yeCDR3 ine series resistance. Zvinogona kuonekwa kuti kana series resistance idiki, CDR3 inokurawo.

Chekupedzisira asi chisiri chidiki, mhedzisiro yesilicon modulator haisi yakaipa kupfuura yeLiNbO3. Sezvakaratidzwa mumufananidzo uri pazasi, CDR3 yemodulator yesiliconichave yakakwira kupfuura yeLiNbO3 kana paine kusarura kwakazara kuburikidza nekugadzirwa kwakanaka kwechimiro nehurefu hwemodulator. Mamiriro ekuyedza anoramba akafanana.

Muchidimbu, dhizaini ye silicon light modulator inogona kuderedzwa chete, kwete kugadziriswa, uye kana ichigona kushandiswa mu FMCW system inoda kuongororwa kwekuyedza, kana ichigona, saka inogona kuwana kubatanidzwa kwe transceiver, izvo zvine zvakanakira kuderedza mitengo mikuru.