Ndondomeko yochepetsera ma frequency a kuwala kutengera MZM modulator

Ndondomeko yochepetsera ma frequency a kuwala kutengeraMZM modulator

Kufalikira kwa ma frequency optical kungagwiritsidwe ntchito ngati liDARgwero la kuwalakutulutsa ndi kusanthula mbali zosiyanasiyana nthawi imodzi, ndipo ingagwiritsidwenso ntchito ngati gwero la kuwala kwa mafunde ambiri la 800G FR4, kuchotsa kapangidwe ka MUX. Nthawi zambiri, gwero la kuwala kwa mafunde ambiri limakhala ndi mphamvu yochepa kapena silinapangidwe bwino, ndipo pali mavuto ambiri. Ndondomeko yomwe yayambitsidwa lero ili ndi zabwino zambiri ndipo ingagwiritsidwe ntchito ngati njira yowunikira. Chithunzi cha kapangidwe kake chikuwonetsedwa motere: Mphamvu yapamwambaLaza ya DFBGwero la kuwala ndi kuwala kwa CW komwe kumayendera nthawi ndi kutalika kwa nthawi imodzi. Mukadutsa mumodulatorNdi fRF yosinthasintha ma frequency enaake, sideband idzapangidwa, ndipo sideband interval ndi modulated frequency fRF. Modulator imagwiritsa ntchito LNOI modulator yokhala ndi kutalika kwa 8.2mm, monga momwe zasonyezedwera pa Chithunzi b. Pambuyo pa gawo lalitali la mphamvu yayikulumodulator ya gawo, ma modulation frequency nawonso ndi fRF, ndipo gawo lake liyenera kupanga crest kapena through ya RF signal ndi light pulse zogwirizana, zomwe zimapangitsa kuti pakhale chirp yayikulu, zomwe zimapangitsa kuti mano owoneka bwino azikhala ambiri. DC bias ndi modulation depth ya modulator zimatha kukhudza flatness ya optical frequency dispersion.

Mwa masamu, chizindikiro pambuyo poti gawo la kuwala lasinthidwa ndi modulator ndi:
Zikuoneka kuti mphamvu ya optical field ndi optical frequency dispersion yokhala ndi frequency interval ya wrf, ndipo mphamvu ya optical frequency dispersion tooth ikugwirizana ndi mphamvu ya DFB optical. Mwa kutsanzira mphamvu ya kuwala yomwe imadutsa mu MZM modulator ndiPM phase modulator, kenako FFT, mawonekedwe owonetsera ma frequency dispersion amapezeka. Chithunzi chotsatirachi chikuwonetsa ubale wachindunji pakati pa flatness ya ma frequency optical ndi modulator DC bias ndi modulation depth kutengera kuyeserera uku.

Chithunzi chotsatirachi chikuwonetsa chithunzi cha spectral choyerekezeredwa ndi MZM bias DC ya 0.6π ndi kuya kwa modulation kwa 0.4π, zomwe zikuwonetsa kuti flatness yake ndi <5dB.

Chithunzi chotsatirachi ndi chithunzi cha phukusi la MZM modulator, LN ndi yokhuthala 500nm, kuya kwake ndi 260nm, ndipo m'lifupi mwa waveguide ndi 1.5um. Kukhuthala kwa electrode yagolide ndi 1.2um. Kukhuthala kwa pamwamba pa SIO2 ndi 2um.

Izi ndi zomwe OFC yoyesedwa imachita, yokhala ndi mano 13 ochepa komanso osalala <2.4dB. Ma frequency a modulation ndi 5GHz, ndipo mphamvu ya RF yomwe imayikidwa mu MZM ndi PM ndi 11.24 dBm ndi 24.96dBm motsatana. Chiwerengero cha mano a optical frequency dispersion excitation chingawonjezeke powonjezera mphamvu ya PM-RF, ndipo nthawi ya optical frequency dispersion ingawonjezeke powonjezera ma frequency a modulation.
Zomwe zili pamwambapa zimachokera ku dongosolo la LNOI, ndipo zotsatirazi zimachokera ku dongosolo la IIIV. Chithunzi cha kapangidwe kake ndi ichi: Chip imagwirizanitsa DBR laser, MZM modulator, PM phase modulator, SOA ndi SSC. Chip imodzi imatha kuchepetsa ma frequency a optical.

SMSR ya laser ya DBR ndi 35dB, m'lifupi mwa mzere ndi 38MHz, ndipo mtundu wa kusintha ndi 9nm.

Modulator ya MZM imagwiritsidwa ntchito kupanga sideband yokhala ndi kutalika kwa 1mm ndi bandwidth ya 7GHz@3dB yokha. Imakhala yocheperako makamaka chifukwa cha kusagwirizana kwa impedance, kutayika kwa optical mpaka 20dB@-8B bias.

Kutalika kwa SOA ndi 500µm, komwe kumagwiritsidwa ntchito kubweza kutayika kwa kusiyana kwa kuwala, ndipo bandwidth ya spectral ndi 62nm@3dB@90mA. SSC yolumikizidwa pa output imawongolera bwino kulumikizana kwa chip (kulumikizana bwino ndi 5dB). Mphamvu yomaliza yotulutsa ndi pafupifupi −7dBm.

Kuti pakhale kufalikira kwa ma frequency optical, ma frequency a RF modulation omwe amagwiritsidwa ntchito ndi 2.6GHz, mphamvu ndi 24.7dBm, ndipo Vpi ya phase modulator ndi 5V. Chithunzi chomwe chili pansipa ndi chithunzi cha photophobic chomwe chimachokera ndi mano 17 a photophobic @10dB ndi SNSR yokwera kuposa 30dB.

Ndondomekoyi yapangidwira kutumiza kwa microwave ya 5G, ndipo chithunzi chotsatirachi ndi gawo la spectrum lomwe lapezeka ndi chowunikira kuwala, chomwe chingapangitse zizindikiro za 26G kuchulukitsa ka 10 kuposa ma frequency. Sizikunenedwa pano.

Mwachidule, ma frequency opangidwa ndi njira iyi ali ndi ma frequency okhazikika, phokoso lochepa, mphamvu yayikulu komanso kuphatikiza kosavuta, komanso pali mavuto angapo. Chizindikiro cha RF chomwe chimayikidwa pa PM chimafuna mphamvu yayikulu, kugwiritsa ntchito mphamvu zambiri, ndipo ma frequency interval amachepetsedwa ndi modulation rate, mpaka 50GHz, zomwe zimafuna ma wavelength interval akuluakulu (nthawi zambiri >10nm) mu FR8 system. Kugwiritsa ntchito pang'ono, mphamvu yosalala sikokwanira.