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 sa bolelele bo bolelele ba 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.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.