Kubyihuta byihuse bihuza itumanaho compact silicon-ishingiye kuri optoelectronic IQ modulator

Gucunga silicon ishingiye kuri optoelectronicIQ modulatorkubyihuta byihuta byitumanaho
Kwiyongera gukenewe kurwego rwo hejuru rwogukwirakwiza amakuru hamwe nogukwirakwiza ingufu nyinshi mu bigo byamakuru byatumye iterambere ryimikorere ikora nezamodulator. Silicon ishingiye kuri tekinoroji ya optoelectronic (SiPh) yahindutse urubuga rutanga ikizere cyo guhuza ibice bitandukanye bya fotonike kuri chip imwe, bigafasha ibisubizo byoroshye kandi bidahenze. Iyi ngingo izasesengura ubwikorezi bushya bwahagaritse silicon IQ modulator ishingiye kuri GeSi EAMs, ishobora gukora kuri frequence igera kuri 75 Gbaud.
Igishushanyo cyibikoresho nibiranga
Icyifuzo cya IQ modulator ifata imiterere itatu yintoki, nkuko bigaragara ku gishushanyo 1 (a). Igizwe na GeSi EAM eshatu hamwe na trmo optique ya feri ya optique, ikoresha iboneza. Itara ryinjiza rifatanije muri chip binyuze mumashanyarazi (GC) kandi bigabanijwemo inzira eshatu unyuze kuri 1 × 3 multimode interferometero (MMI). Nyuma yo kunyura muri modulator no guhinduranya icyiciro, urumuri rusubirwamo nindi 1 × 3 MMI hanyuma igahuzwa na fibre imwe-imwe (SSMF).

Igishushanyo 1: (a) Ishusho ya Microscopique ya moderi ya IQ; (b) - (d) EO S21, igipimo cyo kuzimangana, no kohereza GeSi EAM imwe; (e) Igishushanyo mbonera cya moderi ya IQ hamwe nicyiciro cya optique cyo guhinduranya icyiciro; (f) Guhagarika abitwara byerekana indege igoye. Nkuko bigaragara ku gishushanyo 1 (b), GeSi EAM ifite umurongo mugari wa electro-optique. Igishushanyo 1 (b) cyapimye ibipimo bya S21 byimiterere yikizamini kimwe cya GeSi EAM ukoresheje isesengura rya 67 GHz optique (LCA). Igishushanyo cya 1 (c) na 1 (d) byerekana igipimo cyo kuzimangana (ER) kuri ecran zitandukanye za DC hamwe no kwanduza kumuraba wa nanometero 1555.
Nkuko bigaragara ku gishushanyo cya 1 (e), ikintu cyingenzi kiranga iki gishushanyo nubushobozi bwo guhagarika abatwara optique muguhindura icyiciro cyahinduwe mukuboko hagati. Itandukaniro ryicyiciro hagati yamaboko yo hejuru no hepfo ni π / 2, ikoreshwa muguhuza bigoye, mugihe itandukaniro ryicyiciro hagati yukuboko hagati ni -3 π / 4. Iboneza ryemerera kwivanga kwangiza kubitwara, nkuko bigaragara mu ndege igoye ya shusho ya 1 (f).
Gushiraho ubushakashatsi nibisubizo
Ubushakashatsi bwihuse bwihuse bwerekanwe mubishusho 2 (a). Imashini itanga amashanyarazi uko yishakiye (Keysight M8194A) ikoreshwa nkisoko yikimenyetso, naho icyiciro cya 60 GHz gihuye na RF amplifier (hamwe na bias tees ihuriweho) ikoreshwa nkabashoferi ba modulator. Kubogama kubogamye kwa GeSi EAM ni -2.5 V, kandi icyiciro gihuye na kabili ya RF ikoreshwa kugirango hagabanuke amashanyarazi adahuza imiyoboro ya I na Q.
Igishushanyo 2: (a) Ubushakashatsi bwihuse bwihuse, (b) Guhagarika abatwara kuri 70 Gbaud, (c) Igipimo cyamakosa nigipimo cyamakuru, (d) Inyenyeri kuri 70 Gbaud. Koresha lazeri yubucuruzi yo hanze (ECL) ifite umurongo wa 100 kHz, uburebure bwa 1555 nm, nimbaraga za 12 dBm nkumutwara wa optique. Nyuma yo guhinduka, ibimenyetso bya optique byongerewe imbaraga ukoresheje anerbium-ikoporora fibre amplifier(EDFA) kugirango yishyure igihombo kuri chip hamwe nigihombo cyo kwinjiza modulator.
Ku iherezo ryakiriwe, Optical Spectrum Analyser (OSA) ikurikirana ibimenyetso byerekana ibimenyetso no guhagarika abatwara, nkuko bigaragara ku gishushanyo cya 2 (b) ku kimenyetso 70 Gbaud. Koresha ibyuma bibiri bya polarisiyasi yakira kugirango wakire ibimenyetso, bigizwe na dogere 90 optique ivanze na bine40 GHz yuzuye fotodiode, kandi ihujwe na 33 GHz, 80 GSa / s nyayo-oscilloscope (RTO) (Keysight DSOZ634A). Inkomoko ya kabiri ya ECL ifite umurongo wa 100 kHz ikoreshwa nka oscillator yaho (LO). Bitewe na transmitter ikora mubihe bimwe bya polarisiyasi, imiyoboro ibiri ya elegitoronike niyo ikoreshwa muburyo bwo guhinduranya imibare (ADC). Amakuru yanditswe kuri RTO kandi atunganywa hifashishijwe itumanaho rya sisitemu ya interineti (DSP).
Nkuko bigaragara ku gishushanyo cya 2 (c), moderi ya IQ yageragejwe hakoreshejwe imiterere ya moderi ya QPSK kuva 40 Gbaud kugeza 75 Gbaud. Ibisubizo byerekana ko munsi ya 7% ibyemezo bikomeye byo gukosora amakosa yo gukosora (HD-FEC), igipimo gishobora kugera kuri 140 Gb / s; Ukurikije 20% byoroshye ibyemezo byimbere ikosora ikosora (SD-FEC), umuvuduko urashobora kugera kuri 150 Gb / s. Igishushanyo cy'inyenyeri kuri 70 Gbaud cyerekanwe ku gishushanyo cya 2 (d). Ibisubizo bigarukira kuri oscilloscope yumurongo wa 33 GHz, ibyo bikaba bihwanye numuyoboro mugari wa Gbaud hafi 66.

Nkuko bigaragara ku gishushanyo cya 2 (b), imiterere yamaboko atatu irashobora guhagarika neza abatwara optique hamwe nigipimo cyarenze 30 dB. Iyi miterere ntabwo isaba guhagarika byimazeyo abayitwaye kandi irashobora no gukoreshwa mubakira bisaba amajwi yabatwara kugirango bagarure ibimenyetso, nka Kramer Kronig (KK). Umwikorezi arashobora guhindurwa binyuze mumwanya wo hagati wintoki kugirango agere kubitwara byifuzwa kuruhande (CSR).
Ibyiza na Porogaramu
Ugereranije na gakondo ya Mach Zehnder modulator (MZM modulator) hamwe na silicon ishingiye kuri optoelectronic IQ modulator, icyifuzo cya silicon IQ modulator gifite ibyiza byinshi. Ubwa mbere, iringaniye mubunini, inshuro zirenga 10 ntoya IQ modulator ishingiyeImashini ya Zehnder(ukuyemo udupapuro two guhuza), bityo ukongerera ubucucike no kugabanya agace ka chip. Icya kabiri, igishushanyo mbonera cya electrode ntigisaba gukoresha imashini irwanya, bityo bigabanya ubushobozi bwingufu ningufu kuri biti. Icya gatatu, ubushobozi bwo guhagarika ubwikorezi bugabanya cyane imbaraga zo kohereza, bikarushaho kunoza ingufu.
Byongeye kandi, umurongo wa optique wa GeSi EAM ni mugari cyane (hejuru ya nanometero 30), bivanaho gukenera imiyoboro myinshi yo kugenzura imiyoboro myinshi hamwe nogutunganya kugirango ihagarike kandi ihuze resonance ya moderi ya microwave (MRMs), bityo byoroshe gushushanya.
Ihinduramiterere kandi ikora neza IQ modulator irakwiriye cyane kubisekuruza bizaza, kubara umuyoboro mwinshi, hamwe na transceiver ntoya mu bigo byamakuru, bigafasha ubushobozi buhanitse hamwe n’itumanaho rikoresha ingufu nyinshi.
Umwikorezi yahagaritse moderi ya silicon IQ yerekana imikorere myiza, hamwe nogukwirakwiza amakuru agera kuri 150 Gb / s munsi ya 20% ya SD-FEC. Imiterere yububiko bwamaboko 3 ishingiye kuri GeSi EAM ifite ibyiza byingenzi mubirenge, gukoresha ingufu, no gushushanya byoroshye. Iyi modulator ifite ubushobozi bwo guhagarika cyangwa guhindura optique itwara kandi irashobora guhuzwa hamwe na coherent detection hamwe na Kramer Kronig (KK) gahunda yo gutahura kumirongo myinshi ihuriweho hamwe. Ibyagezweho byerekanwe biganisha ku guhuza imiyoboro ihanitse kandi ikora neza kugira ngo ihuze ibyifuzo bikenerwa mu itumanaho rifite ubushobozi buke mu bigo by’amakuru no mu zindi nzego.