ʻIkepili o nā modulators maʻamau ʻehā

ʻIkepili o nā modulators maʻamau ʻehā

Hoʻolauna kēia pepa i ʻehā mau ʻano modulation (ke hoʻololi nei i ka amplitude laser ma ka nanosecond a i ʻole subnanosecond time domain) i hoʻohana nui ʻia i nā ʻōnaehana laser fiber. ʻO kēia mau mea ʻo AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM/SOA(ka hoʻonui ʻana o ka mālamalama semiconductor i ʻike ʻia hoʻi ʻo ka modulation semiconductor), a memodulation laser pololeiI waena o lākou, ʻo AOM,EOM,Noho ʻo SOM i ka modulation waho, a i ʻole ka modulation ʻaʻole pololei.

1. Mea Hoʻololi Acousto-optic (AOM)

ʻO ka modulation Acousto-optic kahi hana kino e hoʻohana ana i ka hopena acousto-optic e hoʻouka i ka ʻike ma luna o ka mea lawe optical. I ka modulation, hoʻopili mua ʻia ka hōʻailona uila (amplitude modulation) i ka transducer electro-acoustic, ka mea e hoʻololi i ka hōʻailona uila i kahua ultrasonic. Ke hele ka nalu māmā ma o ka acousto-optic medium, ua modulated ka mea lawe optical a lilo i nalu modulated ikaika e lawe ana i ka ʻike ma muli o ka hana acousto-optic.

2. Modulator Electro-optical(EOM)

ʻO kahi modulator electro-optical kahi modulator e hoʻohana ana i nā hopena electro-optical o kekahi mau kristal electro-optical, e like me nā kristal lithium niobate (LiNb03), nā kristal GaAs (GaAs) a me nā kristal lithium tantalate (LiTa03). ʻO ka hopena electro-optical, ʻo ia ka wā e hoʻopili ʻia ai ke voltage i ka kristal electro-optical, e loli ka index refractive o ka kristal electro-optical, e hopena ana i nā loli i nā ʻano nalu māmā o ke kristal, a ua ʻike ʻia ka modulation o ka pae, ka amplitude, ka ikaika a me ke kūlana polarization o ka hōʻailona optical.

Kiʻi: Hoʻonohonoho maʻamau o ke kaapuni hoʻokele EOM

3. Mea Hoʻololi Optical Semiconductor/Mea hoʻonui optical Semiconductor (SOM/SOA)

Hoʻohana pinepine ʻia ka semiconductor optical amplifier (SOA) no ka hoʻonui ʻana i ka hōʻailona optical, nona nā pono o ka chip, ka hoʻohana ʻana i ka mana haʻahaʻa, ke kākoʻo no nā hui āpau, a me nā mea ʻē aʻe, a he koho ʻē aʻe ia no nā amplifier optical kuʻuna e like me EDFA (Hoʻonui fiber i hoʻopili ʻia me ka erbium). ʻO ka semiconductor optical modulator (SOM) ka mea like me ka semiconductor optical amplifier, akā ʻokoʻa iki ke ʻano o ka hoʻohana ʻia ʻana mai ke ʻano o ka hoʻohana ʻia ʻana me ka amplifier SOA kuʻuna, a ʻokoʻa iki nā ʻōkuhi e kālele ana i ka wā e hoʻohana ʻia ai ma ke ʻano he modulator māmā mai nā mea i hoʻohana ʻia ma ke ʻano he amplifier. Ke hoʻohana ʻia no ka hoʻonui ʻana i ka hōʻailona optical, hāʻawi pinepine ʻia kahi au hoʻokele paʻa i ka SOA e hōʻoia i ka hana ʻana o ka SOA ma ka ʻāpana linear; Ke hoʻohana ʻia e hoʻololi i nā pulse optical, hoʻokomo ia i nā hōʻailona optical hoʻomau i ka SOA, hoʻohana i nā pulse uila e kāohi i ke au hoʻokele SOA, a laila kāohi i ke kūlana hoʻopuka SOA ma ke ʻano he amplification/attenuation. Ma ka hoʻohana ʻana i nā ʻano amplification a me attenuation SOA, ua hoʻopili mālie ʻia kēia ʻano modulation i kekahi mau noi hou, e like me ka optical fiber sensing, LiDAR, OCT medical imaging a me nā kahua ʻē aʻe. ʻOi loa no kekahi mau hiʻohiʻona e koi ana i ka nui o ka leo, ka hoʻohana ʻana i ka mana a me ka ratio extinction.

4. Hiki i ka modulation pololei laser ke hoʻololi i ka hōʻailona optical ma o ka hoʻomalu pololei ʻana i ke au bias laser, e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei, loaʻa ka laulā pulse 3 nanosecond ma o ka modulation pololei. Hiki ke ʻike ʻia aia kahi spike ma ka hoʻomaka ʻana o ka pulse, i lawe ʻia e ka hoʻomaha ʻana o ka mea lawe laser. Inā makemake ʻoe e loaʻa kahi pulse ma kahi o 100 picoseconds, hiki iā ʻoe ke hoʻohana i kēia spike. Akā ʻaʻole mākou makemake e loaʻa kēia spike.

Hōʻuluʻulu manaʻo

He kūpono ʻo AOM no ka hoʻopuka mana optical i loko o kekahi mau watts a he hana hoʻololi alapine. He wikiwiki ʻo EOM, akā kiʻekiʻe ka paʻakikī o ka hoʻokele a haʻahaʻa ka lakio extinction. ʻO SOM (SOA) ka hopena kūpono no ka wikiwiki GHz a me ka lakio extinction kiʻekiʻe, me ka hoʻohana ʻana i ka mana haʻahaʻa, ka miniaturization a me nā hiʻohiʻona ʻē aʻe. ʻO nā diode laser pololei ka hopena makepono loa, akā e makaʻala i nā loli i nā ʻano spectral. Loaʻa i kēlā me kēia papahana modulation kona mau pono a me nā hemahema, a he mea nui e hoʻomaopopo pono i nā koi noi i ke koho ʻana i kahi papahana, a e kamaʻāina i nā pono a me nā hemahema o kēlā me kēia papahana, a koho i ka papahana kūpono loa. No ka laʻana, i ka ʻike fiber i hoʻolaha ʻia, ʻo ka AOM kuʻuna ka mea nui, akā i kekahi mau hoʻolālā ʻōnaehana hou, ke ulu wikiwiki nei ka hoʻohana ʻana i nā papahana SOA, i kekahi mau papahana kuʻuna liDAR makani e hoʻohana i ʻelua-paepae AOM, ka hoʻolālā papahana hou i mea e hōʻemi ai i ke kumukūʻai, e hōʻemi i ka nui, a hoʻomaikaʻi i ka lakio extinction, ua lawe ʻia ka papahana SOA. I loko o ka ʻōnaehana kamaʻilio, hoʻohana pinepine ka ʻōnaehana wikiwiki haʻahaʻa i ka papahana modulation pololei, a hoʻohana pinepine ka ʻōnaehana wikiwiki kiʻekiʻe i ka papahana modulation electro-optic.