ʻO ka nūhou noiʻi hou loa o ka laser communication space

ʻO ka nūhou noiʻi hou loa olaser kamaʻilio lewa

ʻO ka ʻōnaehana Internet Satellite, me kāna uhi honua, ka haʻahaʻa haʻahaʻa a me ka bandwidth kiʻekiʻe, ua lilo ia i alakaʻi nui o ka hoʻomohala ʻenehana kamaʻilio e hiki mai ana. ʻO ke kamaʻilio laser Space ka ʻenehana kumu i ka hoʻomohala ʻana i ka ʻōnaehana kamaʻilio satellite.Semiconductor laserhōʻike i ka hiki ke hoʻohana ākea i ka ʻōnaehana kamaʻilio laser space ma muli o kona kūlana kiʻekiʻe, ola lōʻihi, liʻiliʻi liʻiliʻi, paona māmā a me nā hiʻohiʻona modulation maikaʻi loa. Eia nō naʻe, ʻo nā kukui cosmic solar, nā kukuna galactic cosmic a me ka nui o nā mea i hoʻopaʻa ʻia i ka ikehu kiʻekiʻe e like me nā protons, electrons a me nā ion kaumaha i ke kāʻei hopu geomagnetic i loko o ke kaiapuni hiki ke alakaʻi i ka hoʻohaʻahaʻa ʻana i ka hana ʻana o ka hāmeʻa a hiki i ke alakaʻi ʻana i ka hemahema o ka hāmeʻa.

FIG1. Mea hoʻokolohua nolaserloiloi hana

I kēia mau lā, ua holomua nui kahi hui noiʻi ma Kina i ka noiʻi hana o nā laser dot quantum i ka hui kamaʻilio no ka lewa. Ma o ka hoʻolālā band hou a me ka hoʻolālā hoʻolālā ʻāina ikaika, ua hoʻomohala maikaʻi ka hui i nā hopena noiʻi hou loa o nā laser kamaʻilio lewa, i loaʻa ka hana maikaʻi loa i ke kaiapuni ʻāpana ikaika nui, quantum dot lasers. Ua alakaʻi lākou i kahi loiloi hoʻohālikelike hohonu o ka hana ʻana o nā ʻōnaehana mea like ʻole i ke kaiapuni ākea. Hōʻike nā hualoaʻa hoʻokolohua e hōʻike ana ke ʻano kuantum dot i nā pōmaikaʻi kūpaʻa kūʻokoʻa i loko o ke kaiapuni ʻāpana kiʻekiʻe o ka honua haʻahaʻa.

Ma muli o kēia ʻike, ua hoʻolālā maikaʻi ka hui noiʻi a hana i kahi ʻano houlaser kiko kiko. Hōʻike ka mea hana i ka hana maikaʻi loa i nā kaiapuni koʻikoʻi: ma ka 3MeV proton injection a hiki i 7 × 1013 cm-2, mālama ka laser i kahi mea hoʻonui linewidth kokoke i ka zero; ʻO ka haʻahaʻa haʻahaʻa o ka leo haʻahaʻa pili (RIN) o ka hāmeʻa e like me -163 dB/Hz, ʻoiai ma ka nui o ka nui o ka injection, piʻi ka RIN ma 1 dB/Hz wale nō. Eia kekahi, hiki i ka laser ke hana paʻa ma lalo o ke kūlana manaʻo ikaika o -3.1dB. ʻAʻole kēia hoʻokō i hōʻoia i nā hopena noiʻi hou loa o nā laser kamaʻilio ākea, akā hāʻawi pū kekahi i kahi hilinaʻiʻoluʻolu kumu māmāno ke kūkulu ʻana i nā ʻupena kamaʻilio ukali kiʻekiʻe.