Kodi Mach-Zehnder Modulator ndi chiyani?

TheMach-Zehnder Modulator(MZ Modulator) ndi chipangizo chofunikira kwambiri chosinthira zizindikiro za kuwala kutengera mfundo yosokoneza. Mfundo yake yogwirira ntchito ndi iyi: Pa nthambi yooneka ngati Y kumapeto kwa cholowetsa, kuwala kolowera kumagawidwa m'mafunde awiri a kuwala ndipo kumalowa m'njira ziwiri zofanana kuti zitumizidwe motsatana. Njira yowunikira imapangidwa ndi zinthu zamagetsi. Pogwiritsa ntchito mphamvu yake ya photoelectric, pamene chizindikiro chamagetsi chogwiritsidwa ntchito kunja chikusintha, chizindikiro cha refractive cha zinthu zake chikhoza kusinthidwa, zomwe zimapangitsa kusiyana kwa njira yowunikira pakati pa kuwala kuwirikiza kawiri kufika ku nthambi yooneka ngati Y kumapeto kwa chotulutsira. Zizindikiro za kuwala m'njira ziwiri zowunikira zikafika ku nthambi yooneka ngati Y kumapeto kwa chotulutsira, kulumikizana kudzachitika. Chifukwa cha kuchedwa kwa magawo osiyanasiyana kwa zizindikiro ziwiri zowunikira, kusokoneza kumachitika pakati pawo, kusintha chidziwitso cha kusiyana kwa magawo chomwe chimanyamulidwa ndi zizindikiro ziwiri zowunikira kukhala chidziwitso champhamvu cha chizindikiro chotulutsa. Chifukwa chake, ntchito yosinthira zizindikiro zamagetsi pa zonyamulira zamagetsi ikhoza kuchitika powongolera magawo osiyanasiyana a mphamvu yokweza ya modulator ya March-Zehnder.

Magawo oyambira aMZ Modulator

Ma parameter oyambira a MZ Modulator amakhudza mwachindunji magwiridwe antchito a modulator m'njira zosiyanasiyana zogwiritsira ntchito. Pakati pawo, ma parameter ofunikira a kuwala ndi ma parameter amagetsi ndi awa:

Magawo a kuwala:

(1) Bandwidth ya kuwala (bandwidth ya 3db): Ma frequency range pamene ma frequency response amplitude amachepetsa ndi 3db kuchokera pamtengo wapamwamba kwambiri, ndipo unit ndi Ghz. Bandwidth ya kuwala imawonetsa ma frequency range a chizindikiro pamene modulator ikugwira ntchito bwino ndipo ndi chizindikiro choyezera mphamvu yonyamula chidziwitso cha chonyamulira cha kuwala mumodulator yamagetsi.

(2) Chiŵerengero cha kutha: Chiŵerengero cha mphamvu yayikulu yotulutsa kuwala ndi modulator ya electro-optic ku mphamvu yocheperako ya kuwala, ndi unit ya dB. Chiŵerengero cha kutha ndi gawo lowunikira mphamvu ya switch ya electro-optic ya modulator.

(3) Kutayika kobwerera: Chiŵerengero cha mphamvu ya kuwala yomwe yawonetsedwa kumapeto kwa cholowera chamodulatorku mphamvu yolowera ya kuwala, ndi gawo la dB. Kutayika kobwerera ndi chizindikiro chomwe chikuwonetsa mphamvu ya chochitika yomwe imabwereranso ku gwero la chizindikiro.

(4) Kutayika kwa magetsi: Chiŵerengero cha mphamvu yotulutsa kuwala ndi mphamvu yolowetsa kuwala ya modulator ikafika pa mphamvu yake yayikulu yotulutsa, ndipo chipangizocho ndi dB. Kutayika kwa magetsi ndi chizindikiro chomwe chimayesa kutayika kwa mphamvu yowunikira komwe kumachitika chifukwa choyika njira yowunikira.

(5) Mphamvu yayikulu yolowera: Pakugwiritsa ntchito bwino, mphamvu yolowera ya MZM Modulator iyenera kukhala yocheperapo kuposa mtengo uwu kuti chipangizocho chisawonongeke, ndipo chipangizocho chikhale mW.

(6) Kuzama kwa kusintha kwa mawu: Kumatanthauza chiŵerengero cha kutalika kwa chizindikiro cha kusintha kwa mawu ndi kukula kwa chonyamulira, chomwe nthawi zambiri chimafotokozedwa ngati peresenti.

Magawo amagetsi:

Voliyumu ya theka la mafunde: Imatanthauza kusiyana kwa mafunde komwe kumafunika kuti voliyumu yoyendetsa isinthe modulator kuchokera ku off state kupita ku on state. Mphamvu yotulutsa ya MZM Modulator imasinthasintha mosalekeza ndi kusintha kwa bias voltage. Pamene modulator output imapanga kusiyana kwa gawo la madigiri 180, kusiyana kwa bias voltage komwe kumagwirizana ndi minimum point yoyandikana nayo ndi maximum point ndi half-wave voltage, ndi unit ya V. Parameter iyi imatsimikiziridwa ndi zinthu monga zinthu, kapangidwe ndi njira, ndipo ndi parameter yokhazikika yaMZM Modulator.

(2) Voliyumu yayikulu ya DC bias: Pakugwiritsa ntchito bwino, voliyumu ya input bias ya MZM iyenera kukhala yocheperapo kuposa mtengo uwu kuti chipangizocho chisawonongeke. Chipangizocho ndi V. Voliyumu ya DC bias imagwiritsidwa ntchito kuwongolera mkhalidwe wa bias wa modulator kuti ikwaniritse zofunikira zosiyanasiyana za modulation.

(3) Mtengo waukulu wa chizindikiro cha RF: Pakugwiritsa ntchito bwino, chizindikiro chamagetsi cha RF cholowera cha MZM chiyenera kukhala chocheperapo kuposa mtengo uwu kuti chipangizocho chisawonongeke. Chipangizocho ndi V. Chizindikiro cha pafupipafupi cha wailesi ndi chizindikiro chamagetsi chomwe chiyenera kusinthidwa kukhala chonyamulira cha kuwala.