Puisano ea optical fiber, joalo ka e 'ngoe ea litšiea tse kholo tsa puisano ea sejoale-joale, e phetha karolo ea bohlokoa mecheng ea sejoale-joale ea likhokahano.
Mokhoa oa nts'etsopele oa puisano ea fiber optical e ka lebelloa ho tsoa likarolong tse latelang.
1.E le hore u lemohe matla a ntseng a eketseha a tlhahisoleseding le phetisetso ea nako e telele, fiber e nang le mokhoa o le mong o nang le tahlehelo e tlaase le ho hasana ho tlaase e tlameha ho sebelisoa. Hona joale, G.652 e tloaelehileng ea fiber optical mode e le 'ngoe e sebelisoa haholo mecheng ea puisano ea marang-rang ea optical cable. Le hoja fiber ena e na le tahlehelo e fokolang ea 1.55 μm, e na le boleng bo boholo ba ho hasana hoo e ka bang 18 ps / (nm.km). Ho boleloa hore ha fiber e tloaelehileng ea mokhoa o le mong e sebelisoa ka bolelele ba 1.55 μm, ts'ebetso ea phetisetso ha e ntle.
Haeba leqhubu la zero-dispersion wavelength le tlohile ho tloha ho 1.31 μm ho ea ho 1.55 μm, le bitsoa dispersion-shifted fiber (DSF), empa ha fiber ena le erbium-doped fiber amplifier (EDFA) e sebelisoa tsamaisong ea "wavelength division multiplexing" (WDM) , e tla Ka lebaka la ho se lekane ha fiber, ho kopana ha maqhubu a mane ho etsahala, e leng ho thibelang tšebeliso e tloaelehileng ea WDM, e bolelang hore ho hasana ha fiber ea zero ha ho molemo bakeng sa WDM.
E le hore theknoloji ea puisano ea optical fiber e sebelisoe ka katleho tsamaisong ea WDM, ho hasana ha fiber ho lokela ho fokotseha, empa ha hoa lumelloa ho ba zero. Ka hona, fiber e ncha e entsoeng ka mokhoa o le mong e bitsoa non-zero dispersion fiber (NZDF), e leng ho tloha ho 1.54 ~ Boleng ba ho hasana ka har'a 1.56μm e ka bolokoa ho 1.0 ~ 4.0ps / (nm.km), e qobang sebaka se nang le lefela, empa se boloka boleng bo bonyenyane ba ho hasana.
Mehlala e mengata e tlalehiloe phatlalatsa ka mokhoa oa phetisetso oa NZDF's EDFA / WDM.
Lisebelisoa tsa 2.Photonic tse sebelisoang mekhoeng ea puisano ea fiber optical le tsona li tsoetse pele haholo lilemong tsa morao tjena. E le ho finyella litlhoko tsa litsamaiso tsa WDM, lisebelisoa tsa mohloli oa leseli la maqhubu a mangata (MLS) li entsoe lilemong tsa morao tjena. Haholo-holo e hlophisa li-tubes tsa laser tse ngata ka ho latellana 'me e etsa motsoako oa lebasetere o kopantsoeng oa optical o nang le "star coupler".
Bakeng sa pheletso e amohelang ea sistimi ea puisano ea fiber ea optical, photodetector ea eona le preamplifier li hlahisoa haholo-holo ka tataiso ea lebelo le phahameng kapa karabelo e pharaletseng. Li-photodiode tsa PIN li ntse li ka fihlela litlhoko kamora ho ntlafatsoa. Bakeng sa li-photodetectors tsa Broadband tse sebelisoang sehlopheng se selelele sa 1.55μm, tšepe ea semiconductor-metal photodetection tube (MSM) e entsoe lilemong tsa morao tjena. Leqhubu le tsamaeang le ajoa photodetector. Ho latela litlaleho, MSM ena e khona ho bona 78dB ea 3dB frequency bandwidth bakeng sa maqhubu a khanya a 1.55μm.
FET's preamplifier ho ka etsahala hore e nkeloe sebaka ke high electron mobility transistor (HEMT). Ho tlalehoa hore mochine oa optoelectronic oa 1.55μm o sebelisa mochine oa MSM le mochine oa HEMT pre-amplified optoelectronic integration (OEIC) o na le maqhubu a 38GHz 'me a lebelletsoe ho fihla ho 60GHz.
3. Tsamaiso ea PDH ea ho fetisetsa ntlha-to-point tsamaisong ea puisano ea fiber optical ha e khone ho ikamahanya le tsoelo-pele ea mekhoa ea kajeno ea puisano ea thelefono. Ka hona, nts'etsopele ea puisano ea optical fiber mabapi le marang-rang e fetohile mokhoa o ke keng oa qojoa.
SDH ke molao oa motheo oa marang-rang o mocha o nang le litšobotsi tsa mantlha tsa marang-rang. Ke marang-rang a pharaletseng a tlhahisoleseding e kopanyang multiplexing, line transmission le switching function mme e na le matla a matla a ho laola marang-rang. Hona joale e sebelisoa haholo.