Silicon photonics passive Cheebtsam

Silicon photonicspassive Cheebtsam

Muaj ob peb lub ntsiab lus tseem ceeb hauv silicon photonics. Ib qho ntawm cov no yog qhov chaw-emitting grating coupler, raws li pom hauv daim duab 1A. Nws muaj ib tug muaj zog grating nyob rau hauv lub waveguide nws lub sij hawm yog kwv yees li sib npaug zos rau lub wavelength ntawm lub teeb nyob rau hauv lub waveguide. Qhov no tso cai rau lub teeb tawm los yog tau txais perpendicular rau saum npoo, ua rau nws zoo tagnrho rau wafer-theem ntsuas thiab / lossis txuas rau fiber ntau. Grating couplers yog me ntsis tshwj xeeb rau silicon photonics nyob rau hauv uas lawv yuav tsum tau siab ntsug index contrast. Piv txwv li, yog tias koj sim ua ib lub grating coupler nyob rau hauv ib tug pa InP waveguide, lub teeb xau ncaj qha mus rau hauv lub substrate es tsis txhob raug emission vertically vim hais tias cov grating waveguide muaj ib tug qis nruab nrab refractive index tshaj lub substrate. Txhawm rau ua kom nws ua haujlwm hauv InP, cov khoom yuav tsum tau khawb hauv qab lub grating kom ncua nws, raws li qhia hauv daim duab 1B.

Daim duab 1: nto-emitting ib-dimensional grating couplers nyob rau hauv silicon (A) thiab InP (B). Hauv (A), grey thiab lub teeb xiav sawv cev rau silicon thiab silica, feem. Hauv (B), liab thiab txiv kab ntxwv sawv cev InGaAsP thiab InP, feem. Cov duab (C) thiab (D) yog scanning electron microscope (SEM) cov duab ntawm InP tshem tawm cantilever grating coupler.

Lwm qhov tseem ceeb yog qhov chaw hloov pauv qhov loj me (SSC) ntawm qhovoptical waveguidethiab cov fiber ntau, uas hloov ib hom ntawm li 0.5 × 1 μm2 nyob rau hauv silicon waveguide mus rau ib hom ntawm txog 10 × 10 μm2 nyob rau hauv fiber. Ib txoj hauv kev zoo tshaj plaws yog siv cov qauv hu ua inverse taper, nyob rau hauv uas lub waveguide maj Narrows mus rau ib tug me me ntsis, uas ua rau ib tug tseem ceeb expansion ntawm lubkho qhov muaghom thaj. Cov hom no tuaj yeem ntes tau los ntawm lub iav waveguide tshem tawm, raws li qhia hauv daim duab 2. Nrog xws li SSC, qhov sib txuas poob qis dua 1.5dB tau yooj yim ua tiav.

Daim duab 2: Tus qauv loj converter rau silicon hlau waveguides. Cov khoom siv silicon tsim cov qauv inverse conical nyob rau hauv lub ncua kev kawm ntawv iav waveguide. Lub silicon substrate tau etched tam sim ntawd hauv qab lub khob iav waveguide.

Lub ntsiab passive tivthaiv yog polarization beam splitter. Qee qhov piv txwv ntawm cov polarization splitters tau pom hauv daim duab 3. Thawj yog Mach-Zender interferometer (MZI), qhov twg txhua caj npab muaj qhov sib txawv ntawm qhov sib txawv. Qhov thib ob yog ib qho yooj yim directional coupler. Cov duab birefringence ntawm ib tug raug silicon hlau waveguide yog siab heev, yog li transverse magnetic (TM) polarized lub teeb yuav ua tau tag nrho ua ke, thaum transverse hluav taws xob (TE) polarized lub teeb yuav luag uncoupled. Qhov thib peb yog grating coupler, nyob rau hauv uas cov fiber ntau muab tso rau ntawm lub kaum sab xis kom TE polarized lub teeb yog ua ke nyob rau hauv ib qho kev taw qhia thiab TM polarized lub teeb yog ua ke nyob rau hauv lwm yam. Qhov thib plaub yog ob-dimensional grating coupler. Fiber hom uas nws cov hluav taws xob teb yog perpendicular rau cov kev taw qhia ntawm waveguide propagation yog ua ke rau cov coj waveguide. Cov fiber ntau tuaj yeem tilted thiab txuas mus rau ob lub waveguides, lossis perpendicular rau saum npoo thiab txuas mus rau plaub waveguides. Ib qho ntxiv kom zoo dua ntawm ob sab grating couplers yog tias lawv ua raws li polarization rotators, txhais tau hais tias txhua lub teeb ntawm lub nti muaj tib lub polarization, tab sis ob qho tib si orthogonal polarization yog siv hauv fiber ntau.

Daim duab 3: Ntau yam polarization splitters.