Nānā o nā modulators maʻamau ʻehā

Nānā o nā modulators maʻamau ʻehā

Hōʻike kēia pepa i ʻehā mau ʻano modulation (hoʻololi i ka amplitude laser i ka nanosecond a i ʻole subnanosecond time domain) i hoʻohana pinepine ʻia i nā ʻōnaehana laser fiber. ʻO kēia mau mea he AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM/SOA(ka hoʻonui māmā semiconductor i ʻike pū ʻia me ka modulation semiconductor), ahoʻopololei laser pololei. Ma waena o lākou, ʻo AOM,EOM,SOM no ka modulation waho, a i ʻole ka modulation indirect.

1. Acousto-optic Modulator (AOM)

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

2. Electro-optical Modulator(EOM)

ʻO ka 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 tantalate lithium (LiTa03). ʻO ka hopena electro-optical i ka wā e hoʻopili ʻia ai ka uila i ka aniani electro-optical, e hoʻololi ka helu refractive o ka aniani electro-optical, e hopena i nā loli i nā hiʻohiʻona hawewe māmā o ke aniani, a me ka modulation o ka pae, ʻike ʻia ka amplitude, ka ikaika a me ke kūlana polarization o ka hōʻailona optical.

Kiʻi: Hoʻonohonoho maʻamau o ka kaapuni hoʻokele EOM

3. Semiconductor Optical Modulator/Semiconductor optical amplifier (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 haʻahaʻa haʻahaʻa, ke kākoʻo no nā hui āpau, a me nā mea ʻē aʻe.Erbium-doped fiber amplifier). ʻO ka semiconductor optical modulator (SOM) ka mea like me ka semiconductor optical amplifier, akā ʻo ke ʻano o ka hoʻohana ʻana he ʻokoʻa iki ia mai ke ʻano o ka hoʻohana ʻia ʻana me kahi mea hoʻonui SOA kahiko, a me nā mea hōʻailona e kālele ana i ka wā e hoʻohana ʻia ai. ʻokoʻa iki ka 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 mea hoʻokele paʻa i ka SOA e hōʻoia i ka hana ʻana o ka SOA ma ka ʻāpana laina; Ke hoʻohana ʻia ia e hoʻololi i nā pulses optical, hoʻokomo ia i nā hōʻailona optical mau i ka SOA, hoʻohana i nā pulu uila e hoʻokele i ka holo ʻana o ka SOA, a laila e hoʻomalu i ke kūlana puka SOA e like me ka amplification / attenuation. Ke hoʻohana nei i ka hoʻonui SOA a me nā hiʻohiʻona attenuation, ua hoʻohana mālie ʻia kēia mode 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 leo kiʻekiʻe, ka hoʻohana mana a me ka ratio extinction.

4. Hiki i ka hoʻololi ʻana i ka laser ke hoʻololi i ka hōʻailona opitika ma o ka hoʻomalu pono ʻana i ke ʻano o ka laser bias, e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei, loaʻa kahi ākea pulse 3 nanosecond ma o ka modulation pololei. Hiki keʻikeʻia aia he spike i ka hoʻomakaʻana o ka pulse, i laweʻia e ka hoʻomaha o ka mea lawe laser. Inā makemake ʻoe e kiʻi i ka pulse o kahi 100 picoseconds, hiki iā ʻoe ke hoʻohana i kēia spike. Akā ʻaʻole makemake mākou e loaʻa kēia spike.

E hōʻuluʻulu

Ua kūpono ʻo AOM no ka puka mana optical i kekahi mau watts a he hana hoʻololi pinepine. He wikiwiki ka EOM, akā he kiʻekiʻe ka paʻakikī o ka hoʻokele a haʻahaʻa ka lakene hoʻopau. ʻO SOM (SOA) ka hopena maikaʻi loa no ka wikiwiki o GHz a me ka ratio extinction kiʻekiʻe, me ka hoʻohana haʻahaʻa haʻahaʻa, miniaturization a me nā hiʻohiʻona ʻē aʻe. ʻO nā diodes laser pololei ka hopena maʻalahi, akā e makaʻala i nā loli i nā hiʻohiʻona spectral. Loaʻa i kēlā me kēia papahana modulation kona pono pono'ī a me nā hemahema, a he mea nui e hoʻomaopopo pono i nā koi noi i ka wā e koho ai 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 hoʻolaha ʻana i ka fiber sensing, ʻo ka AOM kuʻuna ka mea nui, akā i kekahi mau hoʻolālā ʻōnaehana hou, ke ulu wikiwiki nei ka hoʻohana ʻana i nā ʻōnaehana SOA, i kekahi mau makani liDAR mau hana kuʻuna hoʻohana ʻelua AOM, ka hoʻolālā hoʻolālā hou i mea e e ho'ēmi i ke kumukūʻai, e hoʻemi i ka nui, a hoʻomaikaʻi i ka ratio extinction, ua apono ʻia ka hoʻolālā SOA. I ka ʻōnaehana kamaʻilio, ʻo ka ʻōnaehana haʻahaʻa haʻahaʻa e hoʻohana pinepine i ka hoʻolālā modulation pololei, a ʻo ka ʻōnaehana wikiwiki kiʻekiʻe e hoʻohana pinepine i ka hoʻolālā electro-optic modulation.