Cov khoom siv hluav taws xob me me raws li siliconIQ modulatorrau kev sib txuas lus ceev ceev
Qhov kev thov kom muaj kev xa cov ntaub ntawv ntau dua thiab cov transceivers txuag hluav taws xob ntau dua hauv cov chaw khaws ntaub ntawv tau tsav txoj kev loj hlob ntawm cov khoom siv compact high-performancecov khoom siv kho qhov muagCov thev naus laus zis optoelectronic raws li silicon (SiPh) tau dhau los ua lub platform zoo rau kev sib koom ua ke ntau yam khoom photonic rau hauv ib lub chip, ua rau muaj kev daws teeb meem me me thiab pheej yig. Tsab xov xwm no yuav tshawb nrhiav cov khoom siv tshiab uas tau tshem tawm cov khoom siv silicon IQ raws li GeSi EAMs, uas tuaj yeem ua haujlwm ntawm qhov zaus txog li 75 Gbaud.
Kev tsim qauv thiab cov yam ntxwv ntawm lub cuab yeej
Tus modulator IQ uas tau tsim los siv cov qauv me me peb caj npab, raws li pom hauv Daim Duab 1 (a). Muaj peb GeSi EAM thiab peb lub thermo optical phase shifters, siv cov qauv sib npaug. Lub teeb nkag tau txuas rau hauv lub chip los ntawm lub grating coupler (GC) thiab faib ua peb txoj kev sib npaug los ntawm 1 × 3 multimode interferometer (MMI). Tom qab dhau los ntawm lub modulator thiab phase shifter, lub teeb tau rov ua ke los ntawm lwm 1 × 3 MMI thiab tom qab ntawd txuas nrog ib hom fiber (SSMF).
Daim Duab 1: (a) Daim duab me me ntawm IQ modulator; (b) - (d) EO S21, qhov sib piv ntawm qhov tawg, thiab kev xa tawm ntawm ib qho GeSi EAM; (e) Daim duab kos ntawm IQ modulator thiab qhov sib xws ntawm theem hloov pauv; (f) Kev sawv cev ntawm tus neeg nqa khoom ntawm lub dav hlau nyuaj. Raws li pom hauv Daim Duab 1 (b), GeSi EAM muaj qhov dav dav electro-optic bandwidth. Daim Duab 1 (b) ntsuas qhov S21 parameter ntawm ib qho qauv xeem GeSi EAM siv 67 GHz optical component analyzer (LCA). Daim Duab 1 (c) thiab 1 (d) feem ntau qhia txog qhov sib piv ntawm qhov tawg (ER) spectra ntawm DC voltages sib txawv thiab kev xa tawm ntawm qhov ntev ntawm 1555 nanometers.
Raws li pom hauv Daim Duab 1 (e), qhov tseem ceeb ntawm qhov kev tsim no yog lub peev xwm los tswj cov khoom siv kho qhov muag los ntawm kev kho qhov sib xyaw ua ke ntawm sab caj npab nruab nrab. Qhov sib txawv ntawm theem sab saud thiab sab qis yog π / 2, siv rau kev kho kom zoo, thaum qhov sib txawv ntawm theem nruab nrab yog -3 π / 4. Qhov kev teeb tsa no tso cai rau kev cuam tshuam rau cov khoom siv, raws li pom hauv lub dav hlau nyuaj ntawm Daim Duab 1 (f).
Kev teeb tsa sim thiab cov txiaj ntsig
Qhov kev teeb tsa sim ceev ceev tau qhia nyob rau hauv Daim Duab 2 (a). Lub tshuab hluav taws xob arbitrary waveform (Keysight M8194A) siv ua lub hauv paus teeb liab, thiab ob lub 60 GHz theem phim RF amplifiers (nrog integrated bias tees) siv ua modulator tsav tsheb. Lub bias voltage ntawm GeSi EAM yog -2.5 V, thiab ib lub theem phim RF cable siv los txo qhov hluav taws xob theem tsis sib xws ntawm I thiab Q channels.
Daim Duab 2: (a) Kev teeb tsa kev sim ceev ceev, (b) Kev tshem tawm tus neeg nqa khoom ntawm 70 Gbaud, (c) Tus nqi yuam kev thiab tus nqi ntaub ntawv, (d) Constellation ntawm 70 Gbaud. Siv lub laser sab nraud sab nraud (ECL) nrog txoj kab dav ntawm 100 kHz, wavelength ntawm 1555 nm, thiab lub zog ntawm 12 dBm ua tus neeg nqa khoom kho qhov muag. Tom qab kev hloov kho, lub teeb liab kho qhov muag tau nthuav dav siverbium-doped fiber amplifier(EDFA) los them rau kev poob ntawm on-chip coupling thiab modulator insertion losses.
Ntawm qhov kawg tau txais, Optical Spectrum Analyzer (OSA) saib xyuas cov teeb liab spectrum thiab carrier suppression, raws li pom hauv Daim Duab 2 (b) rau 70 Gbaud teeb liab. Siv lub dual polarization coherent receiver los txais cov teeb liab, uas muaj 90 degree optical mixer thiab plaub40 GHz sib npaug photodiodes, thiab txuas nrog 33 GHz, 80 GSa/s real-time oscilloscope (RTO) (Keysight DSOZ634A). Qhov thib ob ECL qhov chaw nrog kab dav ntawm 100 kHz yog siv ua lub oscillator hauv zos (LO). Vim yog lub transmitter ua haujlwm nyob rau hauv ib qho kev mob polarization, tsuas yog ob txoj hauv kev hluav taws xob siv rau kev hloov pauv analog-rau-digital (ADC). Cov ntaub ntawv raug kaw rau ntawm RTO thiab ua tiav siv lub processor digital signal offline (DSP).
Raws li pom hauv Daim Duab 2 (c), lub IQ modulator tau sim siv QPSK modulation hom ntawv los ntawm 40 Gbaud txog 75 Gbaud. Cov txiaj ntsig qhia tau tias nyob rau hauv 7% kev txiav txim siab yuam kev kho (HD-FEC) tej yam kev mob, tus nqi tuaj yeem ncav cuag 140 Gb / s; Nyob rau hauv qhov xwm txheej ntawm 20% kev txiav txim siab yuam kev kho (SD-FEC), qhov ceev tuaj yeem ncav cuag 150 Gb / s. Daim duab constellation ntawm 70 Gbaud tau pom hauv Daim Duab 2 (d). Qhov tshwm sim yog txwv los ntawm oscilloscope bandwidth ntawm 33 GHz, uas yog sib npaug rau lub teeb liab bandwidth ntawm kwv yees li 66 Gbaud.
Raws li pom hauv Daim Duab 2 (b), cov qauv peb sab caj npab tuaj yeem tiv thaiv cov khoom siv kho qhov muag nrog tus nqi blanking tshaj 30 dB. Cov qauv no tsis tas yuav tsum tau tiv thaiv tag nrho ntawm cov khoom siv thiab kuj tseem siv tau rau hauv cov khoom txais uas xav tau cov suab nrov ntawm cov khoom siv los rov qab tau cov teeb liab, xws li Kramer Kronig (KK) cov khoom txais. Cov khoom siv tuaj yeem hloov kho los ntawm lub cuab yeej hloov pauv theem nruab nrab kom ua tiav qhov sib piv ntawm cov khoom siv rau sab (CSR).
Cov Zoo thiab Cov Ntawv Thov
Piv nrog cov modulators Mach Zehnder ib txwm muaj (Cov modulators MZM) thiab lwm yam silicon-based optoelectronic IQ modulators, qhov kev thov silicon IQ modulator muaj ntau qhov zoo. Ua ntej, nws yog compact hauv qhov loj me, ntau dua 10 npaug me dua li IQ modulators raws liMach Zehnder modulators(tsis suav nrog cov ntaub nplaum sib txuas), yog li ua rau kom muaj kev sib koom ua ke ntau ntxiv thiab txo thaj chaw ntawm cov chip. Qhov thib ob, kev tsim cov electrode uas tau teeb tsa tsis tas yuav siv cov resistors kawg, yog li txo cov peev xwm ntawm lub cuab yeej thiab lub zog ib ntsis. Qhov thib peb, lub peev xwm tswj cov cab kuj ua rau kom txo tau lub zog kis tau zoo tshaj plaws, thiab txhim kho kev siv zog.
Ntxiv rau, qhov optical bandwidth ntawm GeSi EAM yog dav heev (ntau tshaj 30 nanometers), tshem tawm qhov xav tau rau ntau-channel feedback control circuits thiab processors los stabilize thiab synchronize lub resonance ntawm microwave modulators (MRMs), yog li ua kom yooj yim rau kev tsim qauv.
Lub modulator IQ me me thiab ua haujlwm tau zoo no yog qhov tsim nyog heev rau tiam tom ntej, suav cov channel siab, thiab cov transceivers me me hauv cov chaw khaws ntaub ntawv, ua kom muaj peev xwm ntau dua thiab kev sib txuas lus optical zoo dua.
Tus neeg nqa khoom uas raug txo qis silicon IQ modulator ua tau zoo heev, nrog rau tus nqi xa cov ntaub ntawv txog li 150 Gb / s nyob rau hauv 20% SD-FEC tej yam kev mob. Nws cov qauv compact 3-arm raws li GeSi EAM muaj qhov zoo tseem ceeb hauv cov nqe lus ntawm qhov chaw, kev siv hluav taws xob zoo, thiab kev tsim qauv yooj yim. Tus modulator no muaj peev xwm tswj lossis kho tus neeg nqa khoom optical thiab tuaj yeem koom ua ke nrog kev tshawb nrhiav coherent thiab Kramer Kronig (KK) cov phiaj xwm tshawb nrhiav rau ntau kab compact coherent transceivers. Cov kev ua tiav tau ua pov thawj tsav tsheb kev paub txog kev sib xyaw ua ke thiab ua haujlwm tau zoo kom tau raws li qhov kev thov loj hlob rau kev sib txuas lus cov ntaub ntawv muaj peev xwm siab hauv cov chaw khaws ntaub ntawv thiab lwm qhov chaw.
Lub sijhawm tshaj tawm: Lub Ib Hlis-21-2025