Tsim ntawm photonic integrated circuit

Tsim ntawmphotonicintegrated circuit

Photonic integrated circuits(PIC) feem ntau yog tsim los nrog kev pab ntawm cov ntawv lej vim qhov tseem ceeb ntawm txoj kev ntev hauv interferometers lossis lwm yam kev siv uas nkag siab rau txoj kev ntev.PICyog tsim los ntawm pattering ntau cov khaubncaws sab nraud povtseg (feem ntau 10 mus rau 30) ntawm lub wafer, uas yog tsim los ntawm ntau cov duab polygonal, feem ntau sawv cev rau hauv GDSII hom. Ua ntej xa cov ntaub ntawv mus rau lub chaw tsim khoom photomask, nws yog qhov xav tau kom muaj peev xwm simulate PIC los xyuas qhov tseeb ntawm qhov tsim. Qhov kev simulation tau muab faib ua ntau theem: theem qis tshaj yog qhov kev sim ua peb-dimensional electromagnetic (EM), qhov kev simulation tau ua nyob rau qib sub-wavelength, txawm hais tias kev sib cuam tshuam ntawm cov atoms hauv cov khoom siv los ntawm macroscopic scale. Cov txheej txheem muaj xws li peb-dimensional finite-sib txawv Time-domain (3D FDTD) thiab eigenmode expansion (EME). Cov txheej txheem no yog qhov tseeb tshaj plaws, tab sis ua tsis tau zoo rau tag nrho PIC simulation lub sijhawm. Cov theem tom ntej yog 2.5-dimensional EM simulation, xws li finite-difference beam propagation (FD-BPM). Cov txheej txheem no tau nrawm dua, tab sis txi qee qhov tseeb thiab tsuas yog tuaj yeem ua rau paraxial propagation thiab tsis tuaj yeem siv los simulate resonators, piv txwv li. Qib tom ntej yog 2D EM simulation, xws li 2D FDTD thiab 2D BPM. Cov no kuj tau nrawm dua, tab sis muaj kev ua haujlwm tsawg, xws li lawv tsis tuaj yeem sim cov polarization rotators. Ib theem ntxiv yog kis tau tus mob thiab/los yog scattering matrix simulation. Txhua lub ntsiab lus tseem ceeb raug txo mus rau ib feem nrog cov tswv yim thiab cov zis, thiab cov kev sib txuas waveguide raug txo mus rau theem hloov thiab attenuation caij. Cov simulations no ceev heev. Lub teeb liab tso zis yog tau los ntawm kev sib npaug ntawm qhov sib kis matrix los ntawm cov teeb liab input. Lub scattering matrix (uas yog cov ntsiab lus hu ua S-tsis) muab cov tswv yim tawm tswv yim thiab cov teeb liab tawm ntawm ib sab kom pom cov tswv yim thiab cov teeb liab tawm ntawm lwm sab ntawm cov khoom. Yeej, lub scattering matrix muaj cov kev xav hauv lub caij. Lub scattering matrix feem ntau yog ob zaug loj li qhov sib kis matrix hauv txhua qhov loj. Hauv cov ntsiab lus, los ntawm 3D EM mus rau kev sib kis / tawg matrix simulation, txhua txheej ntawm simulation nthuav tawm kev lag luam tawm ntawm kev nrawm thiab raug, thiab cov neeg tsim qauv xaiv cov qib zoo ntawm simulation rau lawv cov kev xav tau tshwj xeeb los txhim kho cov txheej txheem tsim validation.

Txawm li cas los xij, kev cia siab rau kev simulation electromagnetic ntawm qee cov ntsiab lus thiab siv cov khoom tawg / hloov matrix los simulate tag nrho PIC tsis tau lees tias qhov tsim kom raug tag nrho nyob rau hauv pem hauv ntej ntawm cov phaj ntws. Piv txwv li, kev xam qhov ntev ntawm txoj kev tsis raug, ntau hom waveguides uas tsis ua haujlwm zoo rau kev txiav txim siab zoo, lossis ob lub waveguides uas nyob ze rau ib leeg ua rau muaj teeb meem kev sib txuas uas tsis tau xav txog yuav ua rau tsis pom thaum simulation. Yog li ntawd, txawm hais tias cov cuab yeej simulation siab heev muab lub peev xwm tsim muaj peev xwm ua tau zoo, nws tseem yuav tsum tau muaj kev ceev faj thiab ceev faj soj ntsuam los ntawm tus tsim qauv, ua ke nrog cov kev paub dhau los thiab kev paub txuj ci, los xyuas kom meej qhov tseeb thiab kev ntseeg siab ntawm tus tsim thiab txo qhov kev pheej hmoo ntawm cov khoom siv. daim ntawv ntws.

Cov txheej txheem hu ua sparse FDTD tso cai rau 3D thiab 2D FDTD simulations tau ua ncaj qha rau ntawm tus qauv PIC tiav kom siv tau tus qauv tsim. Txawm hais tias nws nyuaj rau txhua yam khoom siv hluav taws xob simulation los simulate PIC loj heev, qhov sib txawv FDTD muaj peev xwm simulate ib cheeb tsam loj. Nyob rau hauv ib txwm 3D FDTD, qhov kev simulation pib los ntawm kev pib lub rau lub Cheebtsam ntawm lub electromagnetic teb nyob rau hauv ib tug tshwj xeeb quantized ntim. Raws li lub sij hawm nce mus, cov teb tshiab nyob rau hauv lub ntim yog xam, thiab hais txog. Txhua kauj ruam yuav tsum tau muab xam ntau, yog li nws yuav siv sij hawm ntev. Nyob rau hauv sparse 3D FDTD, es tsis txhob muab xam ntawm txhua kauj ruam ntawm txhua lub ntsiab lus ntawm lub ntim, ib daim ntawv teev cov teb Cheebtsam yog khaws cia uas muaj peev xwm theoretically sib haum mus rau ib tug arbitrarily loj ntim thiab xam tsuas yog rau cov Cheebtsam. Nyob rau hauv txhua lub sij hawm cov kauj ruam, cov ntsiab lus nyob ib sab ntawm lub teb Cheebtsam yog ntxiv, thaum lub teb Cheebtsam hauv qab ib tug tej yam hwj chim pib raug poob. Rau qee cov qauv, qhov kev suav no tuaj yeem ua tau ntau qhov kev txiav txim siab sai dua li ib txwm 3D FDTD. Txawm li cas los xij, sparse FDTDS tsis ua haujlwm zoo thaum cuam tshuam nrog cov qauv sib txawv vim tias lub sijhawm no nthuav tawm ntau dhau, ua rau cov npe ntev dhau thiab nyuaj rau kev tswj hwm. Daim duab 1 qhia ib qho piv txwv screenshot ntawm 3D FDTD simulation zoo ib yam li lub polarization beam splitter (PBS).

Daim duab 1: Simulation tau los ntawm 3D sparse FDTD. (A) yog ib qho kev pom sab saum toj ntawm cov qauv simulated, uas yog ib qho kev taw qhia txuas. (B) Qhia ib qho screenshot ntawm kev simulation siv quasi-TE excitation. Ob daim duab saum toj no qhia txog qhov pom sab saum toj ntawm quasi-TE thiab quasi-TM cov cim, thiab ob daim duab hauv qab no qhia txog qhov sib thooj saib. (C) Qhia ib lub screenshot ntawm kev simulation siv quasi-TM excitation.