Abstract
To address the continuous growth in high-speed ubiquitous access required by residential users and enterprises, Telecommunication operators must upgrade their networks to higher data rates. For optical fiber access networks that directly connect end users to metro/regional network, capacity upgrade must be done in a cost- and energy-efficient manner. 40 Gb/s is the possible lane rate for the next generation passive optical networks (NG-PONs). Ideally, existing 10 G PON components could be reused to support 40 Gb/s lane-rate NG-PON transceiver, which requires efficient modulation format and digital signal processing (DSP) to alleviate the bandwidth limitation and fiber dispersion. The major contribution of this work is to offer insight performance comparisons of 40 Gb/s lane rate electrical three level Duobinary, optical Duobinary, and four-level pulse amplitude modulation (PAM-4) for incorporating low complex DSPs, including linear and nonlinear Volterra equalization, as well as maximum likelihood sequence estimation. Detailed analysis and comparison of the complexity of various DSP algorithms are performed. Transceiver bandwidth optimization is also undertaken. The results show that the choices of proper modulation format and DSP configuration depend on the transmission distances of interest.
Highlights
The continuous growth of bandwidth demand from residential users and enterprises urgently pushes telecommunication operators to upgrade the capacity of access networks to higher data rates
For the typical standardized transmission distance of 20 km SMF, digital signal processing (DSP)-free PAM-4 can be considered if the minimization of the receiver complexity is the priority, while electrical Duobinary with 4-state MLSE is preferred if a link with link budget as large as possible is preferred
Comprehensive numerical investigations and comparisons have been made between 40 Gb/s lane rate electrical Duobinary, optical Duobinary, and PAM-4 systems, using practical linear and nonlinear equalizations and low complex MLSE for next generation passive optical networks (NG-passive optical network (PON))
Summary
The continuous growth of bandwidth demand from residential users and enterprises urgently pushes telecommunication operators to upgrade the capacity of access networks to higher data rates. Among various access technologies that connect end users to metropolitan or regional networks, the passive optical network (PON) is the most efficient one, as it does not require any active components such as switches in the optical distribution network (ODN), instead, a passive power splitter or a wavelength router is usually deployed in the remote node. The roadmap shows the evolving history of PONs, and predicts the future PONs beyond today’s standardized NG-PON2 which adopFtsututirme Inet/ernweta2v01e8l,e1n0,gxtFhORdPivEEisRioREnVmIEWultiplexing (TWDM) technology capable of deliverin2go4f011Gb/s transmission over four wavelengths [1]. Tdhae fhuitguhreaavcaceilsasbnielittwyoorkf snheatvweotrokofefqerumipomreefneta.tuArems,osnugchthese featuraesss,yhstiegmh craecpoancfiitgyuraanbdililtoyn, fglerxeiabcilhitya,raenodf agrheigaht iamvapiolarbtialnityceo,fbneectawuosrekoefqtuhipemsiegnnt.ifiAcmanont gbathnedswe idth demafnedatufrroems, heimghercgaipnagcihtyigahn-dsploenegdrmeaocbhilaereseorfvgicreeastsiumcphoarsta5nGceI,nbfercaasutrsue cotfutrheePsuigbnliifcicParnitvbaatendPwaritdntehrship (5G PdPePm)awndhifcrhomanteimciepragtinesg thoigcho-psepewedithmaob1i0le00s-efrovlidceisncsruecahseasin5dGatIanftrraasftfirucc,tausrewPeullbalisc tPhreivIantteernet of thiPInnagtrestrnn(eIerotsThoi)fp.thL(5ionGwgPs-Pc(IoPos)Ttw).mhLioochbwia-lcneotfiscrtiopmnaott-ebhsilateoufcrloownptei-lhlwabiutehlcwaom1il0le0b0eo-cfnooemldoeifnoctnhreeeaosmfetaihnjeodmradtaajrotirrvadefrrfiiscv,feaorssrwfooeprltloiapcsatitlchaaelccess netwaocrckess.s Tnoetmweoerktst.hTeoemmeeergt itnhge seemrvericgeinrgeqseurivriecme erenqtsu,irtehmeernotas,dtmheaproaaldsmo ainpdaiclsaoteisndthicaatteaslttehrantative ODNasltseurcnhataivsewOaDvNelsensugcthh-arsowutaevdelOenDgNth-(rnoaumtedelyODWND(Mna-mPOelyNWs) DmMay-PaOlsNos)bme caoynaslsidoebreedco, nessipdeecrieadl,ly for greenesfipeelcdiadlleypfloorygmreeenntfsi.eld deployments
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