Cov khoom siv passive silicon photonics

Silicon photonicscov khoom tsis ua haujlwm

Muaj ntau yam khoom tseem ceeb hauv silicon photonics. Ib qho ntawm cov no yog lub coupler grating uas ci ntsa iab saum npoo av, raws li pom hauv Daim Duab 1A. Nws muaj lub grating muaj zog hauv lub waveguide uas lub sijhawm sib npaug rau lub wavelength ntawm lub teeb nthwv dej hauv lub waveguide. Qhov no tso cai rau lub teeb kom tawm lossis tau txais perpendicular rau saum npoo av, ua rau nws zoo tagnrho rau kev ntsuas wafer thiab / lossis kev sib txuas rau lub fiber. Grating couplers yog qee yam tshwj xeeb rau silicon photonics vim tias lawv xav tau qhov sib piv ntsug siab. Piv txwv li, yog tias koj sim ua lub grating coupler hauv lub InP waveguide ib txwm muaj, lub teeb xau ncaj qha mus rau hauv lub substrate es tsis txhob raug tso tawm ntsug vim tias lub grating waveguide muaj qhov nruab nrab qis dua li lub substrate. Yuav kom nws ua haujlwm hauv InP, cov khoom siv yuav tsum tau khawb hauv qab lub grating kom ncua nws, raws li pom hauv Daim Duab 1B.

Daim Duab 1: cov khoom sib txuas ua ke uas muaj ib sab ntawm cov grating hauv silicon (A) thiab InP (B). Hauv (A), xim grey thiab xiav daj sawv cev rau silicon thiab silica. Hauv (B), xim liab thiab txiv kab ntxwv sawv cev rau InGaAsP thiab InP. Cov Duab (C) thiab (D) yog cov duab scanning electron microscope (SEM) ntawm InP suspended cantilever grating coupler.

Lwm qhov tseem ceeb yog qhov hloov pauv qhov loj me (SSC) ntawm qhovkev taw qhia txog lub teeb pom kev zoothiab cov fiber, uas hloov hom ntawm txog 0.5 × 1 μm2 hauv silicon waveguide mus rau hom ntawm txog 10 × 10 μm2 hauv cov fiber. Ib txoj hauv kev ib txwm yog siv cov qauv hu ua inverse taper, uas cov waveguide maj mam nqaim mus rau qhov me me, uas ua rau muaj kev nthuav dav ntawmkho qhov muaghom thaj. Hom no tuaj yeem raug ntes los ntawm lub iav waveguide uas dais, raws li pom hauv Daim Duab 2. Nrog rau SSC zoo li no, qhov kev poob ntawm kev sib txuas tsawg dua 1.5dB yooj yim ua tiav.

Daim Duab 2: Tus qauv hloov qhov loj me rau cov hlau silicon waveguides. Cov khoom siv silicon tsim cov qauv conical inverse sab hauv lub iav waveguide uas dais. Lub silicon substrate tau raug etched tseg hauv qab lub iav waveguide uas dais.

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

Daim Duab 3: Ntau lub polarization splitters.