{"id":328,"date":"2014-06-23T10:01:52","date_gmt":"2014-06-23T10:01:52","guid":{"rendered":"http:\/\/www.dkphotonics.com\/blog\/?p=328"},"modified":"2014-06-23T10:01:52","modified_gmt":"2014-06-23T10:01:52","slug":"wdm-pon-technology-dk-photonics","status":"publish","type":"post","link":"https:\/\/www.dkphotonics.com\/blog\/wdm-pon-technology-dk-photonics\/","title":{"rendered":"WDM-PON technology-DK Photonics"},"content":{"rendered":"

WDM-PON\u00a0provides\u00a0the\u00a0dedicated\u00a0bandwidth\u00a0of\u00a0a\u00a0point-to-point\u00a0network\u00a0and\u00a0the\u00a0fiber\u00a0sharing\u00a0inherent\u00a0in\u00a0PONs.\u00a0The\u00a0architecture\u00a0is\u00a0somewhat\u00a0similar\u00a0to\u00a0that\u00a0of\u00a0EPON\u00a0and\u00a0GPON;\u00a0instead\u00a0of\u00a0the\u00a0power-splitter\u00a0approach\u00a0used\u00a0in\u00a0TDM-PON\u00a0architectures,\u00a0WDM-PON\u00a0uses\u00a0an\u00a0<\/span>arrayed<\/span>\u00a0<\/span>waveguide<\/span>\u00a0<\/span>grating\u00a0<\/span><\/a>(AWG)\u00a0filter\u00a0that\u00a0separates\u00a0the\u00a0wavelengths\u00a0for\u00a0individual\u00a0delivery\u00a0to\u00a0the\u00a0subscriber\u00a0ONUs\u00a0(see\u00a0Figure\u00a01).<\/span><\/p>\n

A\u00a0simple,\u00a0plug-and-play\u00a0implementation\u00a0is\u00a0based\u00a0on\u00a0wavelength-locked\u00a0or\u00a0tunable\u00a0lasers.\u00a0Self-tuning\u00a0“colorless”\u00a0ONUs\u00a0can\u00a0be\u00a0used\u00a0at\u00a0the\u00a0subscriber\u00a0sites\u00a0to\u00a0simplify\u00a0inventory\u00a0and\u00a0spare-part\u00a0handling.\u00a0Colorless\u00a0optics\u00a0not\u00a0only\u00a0simplify\u00a0operations,\u00a0but\u00a0also\u00a0reduce\u00a0deployment\u00a0costs,\u00a0since\u00a0they\u00a0don’t\u00a0need\u00a0the\u00a0expensive\u00a0wavelength-stability\u00a0components\u00a0that\u00a0traditional\u00a0fixed\u00a0and\u00a0tunable\u00a0optics\u00a0require.\u00a0There\u00a0are\u00a0multiple\u00a0approaches\u00a0to\u00a0the\u00a0colorless\u00a0ONU\u00a0technology.<\/span><\/p>\n

In\u00a0one\u00a0approach,\u00a0the\u00a0wavelength\u00a0of\u00a0the\u00a0ONU\u00a0transmitter\u00a0is\u00a0controlled\u00a0by\u00a0injection\u00a0of\u00a0a\u00a0“seed”\u00a0signal\u00a0into\u00a0the\u00a0transmitter\u00a0(e.g.,\u00a0a\u00a0wavelength-locked\u00a0Fabry-Perot\u00a0laser\u00a0or\u00a0reflective\u00a0semiconductor\u00a0optical\u00a0amplifier).\u00a0The\u00a0seed\u00a0signal\u00a0injected\u00a0into\u00a0the\u00a0transmitter\u00a0could\u00a0come\u00a0from\u00a0broadband\u00a0ASE\u00a0light\u00a0sliced\u00a0through\u00a0the\u00a0filters\u00a0in\u00a0the\u00a0system\u00a0or\u00a0from\u00a0a\u00a0DFB\u00a0laser\u00a0array.\u00a0In\u00a0a\u00a0self-seeding\u00a0version\u00a0of\u00a0this\u00a0approach,\u00a0the\u00a0seed\u00a0light\u00a0is\u00a0provided\u00a0by\u00a0feedback\u00a0of\u00a0broadband\u00a0light\u00a0from\u00a0the\u00a0transmitter\u00a0itself.\u00a0The\u00a0passive\u00a0filtering\u00a0of\u00a0the\u00a0seed\u00a0light\u00a0in\u00a0the\u00a0remote\u00a0node\u00a0determines\u00a0the\u00a0wavelength\u00a0of\u00a0the\u00a0ONU\u00a0transmitter.<\/span><\/p>\n

In\u00a0a\u00a0different\u00a0approach,\u00a0the\u00a0colorless\u00a0ONU\u00a0contains\u00a0a\u00a0<\/span>singlemode\u00a0<\/span>optic\u00a0coupler\u00a0<\/span><\/a>wavelength-tunable\u00a0laser,\u00a0which\u00a0is\u00a0able\u00a0to\u00a0tune\u00a0to\u00a0the\u00a0appropriate\u00a0wavelength\u00a0that\u00a0matches\u00a0the\u00a0remote\u00a0node\u00a0filter\u00a0port.<\/span><\/p>\n

Below\u00a010-Gbps\u00a0channel\u00a0bit\u00a0rates,\u00a0the\u00a0injection-seeded\u00a0method\u00a0provides\u00a0a\u00a0cost-efficient\u00a0approach.\u00a0As\u00a0an\u00a0example,\u00a0a\u00a0wavelength-locked\u00a0Fabry-Perot\u00a0transmitter\u00a0can\u00a0be\u00a0integrated\u00a0into\u00a0an\u00a0MSA\u00a0SFP\u00a0pluggable\u00a0form-factor\u00a0module,\u00a0which\u00a0enables\u00a0the\u00a0use\u00a0of\u00a0third-party\u00a0CPE\u00a0devices.\u00a0A\u00a0modified\u00a0EDFA\u00a0gain\u00a0block\u00a0in\u00a0a\u00a070\u00d7<\/span>90\u00a0MSA\u00a0form\u00a0factor\u00a0could\u00a0be\u00a0used\u00a0to\u00a0generate\u00a0the\u00a0broadband\u00a0ASE\u00a0light\u00a0that’s\u00a0used\u00a0as\u00a0a\u00a0seed\u00a0signal\u00a0in\u00a0the\u00a0system.<\/span><\/span><\/p>\n

At\u00a010-Gbps\u00a0bit\u00a0rates,\u00a0tunable-laser\u00a0technology\u00a0offers\u00a0an\u00a0alternative\u00a0to\u00a0the\u00a0injection-seeded\u00a0approach.\u00a0The\u00a0tunable-laser\u00a0technology\u00a0developed\u00a0for\u00a0the\u00a0metro\/long-haul\u00a0market\u00a0has\u00a0matured\u00a0significantly\u00a0over\u00a0the\u00a0past\u00a0couple\u00a0of\u00a0years\u00a0and\u00a0is\u00a0able\u00a0to\u00a0give\u00a0a\u00a0good\u00a0cost-per-bit\u00a0ratio\u00a0when\u00a0high\u00a0capacity\u00a0is\u00a0needed.<\/span><\/p>\n

If\u00a0the\u00a0WDM-PON\u00a0system\u00a0is\u00a0properly\u00a0designed,\u00a0then\u00a0it’s\u00a0possible\u00a0to\u00a0mix\u00a0different\u00a0transmission\u00a0technologies.\u00a0By\u00a0following\u00a0certain\u00a0design\u00a0rules\u00a0during\u00a0the\u00a0installation\u00a0of\u00a0the\u00a0WDM-PON\u00a0system,\u00a0it’s\u00a0possible\u00a0to\u00a0allow\u00a0step-wise\u00a0channel\u00a0upgrades\u00a0to\u00a0higher\u00a0bit\u00a0rates\u00a0when\u00a0the\u00a0demand\u00a0arises.\u00a0These\u00a0design\u00a0rules\u00a0ensure\u00a0that\u00a0channel\u00a0OSNR\u00a0requirements\u00a0will\u00a0be\u00a0met\u00a0in\u00a0the\u00a0presence\u00a0of\u00a0reflections\u00a0and\u00a0that\u00a0inter-channel\u00a0crosstalk\u00a0is\u00a0avoided.\u00a0The\u00a0result\u00a0is\u00a0an\u00a0open\u00a0and\u00a0flexible\u00a0access\u00a0network\u00a0that\u00a0can\u00a0support\u00a0many\u00a0applications\u00a0and\u00a0services\u00a0over\u00a0the\u00a0same\u00a0infrastructure.\u00a0WDM-PON\u00a0thus\u00a0becomes\u00a0an\u00a0optical\u00a0option\u00a0for\u00a0the\u00a0access\u00a0network\u00a0as\u00a0and\u00a0where\u00a0it\u00a0makes\u00a0sense.<\/span><\/p>\n

Given\u00a0its\u00a0ability\u00a0to\u00a0help\u00a0service\u00a0providers\u00a0cope\u00a0with\u00a0current\u00a0bandwidth\u00a0demands\u00a0as\u00a0well\u00a0as\u00a0the\u00a0next\u00a0potential\u00a0broadband\u00a0access\u00a0bottleneck,\u00a0WDM-PON<\/span>\/\u00a0<\/span>100GHz\u00a0DWDM\u00a0Module<\/span>\u00a0<\/span><\/a>is\u00a0becoming\u00a0an\u00a0important\u00a0technology\u00a0to\u00a0consider\u00a0in\u00a0terms\u00a0of\u00a0its\u00a0benefits\u00a0and\u00a0market\u00a0timing.\u00a0As\u00a0with\u00a0any\u00a0emerging\u00a0technology,\u00a0service\u00a0providers\u00a0need\u00a0to\u00a0consider\u00a0the\u00a0optimal\u00a0strategy\u00a0for\u00a0initial\u00a0deployment\u00a0of\u00a0WDM-PON.\u00a0That\u00a0includes\u00a0how\u00a0they\u00a0could\u00a0use\u00a0WDM-PON\u00a0for\u00a0additional\u00a0network\u00a0applications\u00a0as\u00a0the\u00a0technology\u00a0matures\u00a0and\u00a0its\u00a0costs\u00a0come\u00a0down.<\/span><\/p>\n\n\n\n\n
\n

\u00a0<\/span>\"WDM-PON<\/a><\/p>\n

WDM-PON technology<\/p>\n

\n<\/td>\n<\/tr>\n

\n

FIGURE\u00a02.\u00a0Architectural\u00a0scenario\u00a0explored\u00a0in\u00a0the\u00a0collaboration\u00a0between\u00a0Transmode\u00a0and\u00a0Deutsche\u00a0Telekom\u00a0Hochschule\u00a0f\u00fc<\/span>r\u00a0Telekommunikation.<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The\u00a0latest\u00a0generations\u00a0of\u00a0<\/span>WDM-PON\u00a0systems<\/span><\/a>\u00a0are\u00a0now\u00a0gaining\u00a0traction\u00a0with\u00a0operators\u00a0around\u00a0the\u00a0globe\u00a0for\u00a0field\u00a0deployment,\u00a0lab\u00a0trials,\u00a0and\u00a0evaluations.\u00a0It’s\u00a0clearly\u00a0the\u00a0early\u00a0stage\u00a0of\u00a0WDM-PON\u00a0deployments,\u00a0but\u00a0progress\u00a0has\u00a0started\u00a0and\u00a02014\u00a0looks\u00a0to\u00a0be\u00a0a\u00a0pivotal\u00a0year\u00a0for\u00a0the\u00a0technology.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

WDM-PON\u00a0provides\u00a0the\u00a0dedicated\u00a0bandwidth\u00a0of\u00a0a\u00a0point-to-point\u00a0network\u00a0and\u00a0the\u00a0fiber\u00a0sharing\u00a0inherent\u00a0in\u00a0PONs.\u00a0The\u00a0architecture\u00a0is\u00a0somewhat\u00a0similar\u00a0to\u00a0that\u00a0of\u00a0EPON\u00a0and\u00a0GPON;\u00a0instead\u00a0of\u00a0the\u00a0power-splitter\u00a0approach\u00a0used\u00a0in\u00a0TDM-PON\u00a0architectures,\u00a0WDM-PON\u00a0uses\u00a0an\u00a0arrayed\u00a0waveguide\u00a0grating\u00a0(AWG)\u00a0filter\u00a0that\u00a0separates\u00a0the\u00a0wavelengths\u00a0for\u00a0individual\u00a0delivery\u00a0to\u00a0the\u00a0subscriber\u00a0ONUs\u00a0(see\u00a0Figure\u00a01). A\u00a0simple,\u00a0plug-and-play\u00a0implementation\u00a0is\u00a0based\u00a0on\u00a0wavelength-locked\u00a0or\u00a0tunable\u00a0lasers.\u00a0Self-tuning\u00a0“colorless”\u00a0ONUs\u00a0can\u00a0be\u00a0used\u00a0at\u00a0the\u00a0subscriber\u00a0sites\u00a0to\u00a0simplify\u00a0inventory\u00a0and\u00a0spare-part\u00a0handling.\u00a0Colorless\u00a0optics\u00a0not\u00a0only\u00a0simplify\u00a0operations,\u00a0but\u00a0also\u00a0reduce\u00a0deployment\u00a0costs,\u00a0since\u00a0they\u00a0don’t\u00a0need\u00a0the\u00a0expensive\u00a0wavelength-stability\u00a0components\u00a0that\u00a0traditional\u00a0fixed\u00a0and\u00a0tunable\u00a0optics\u00a0require.\u00a0There\u00a0are\u00a0multiple\u00a0approaches\u00a0to\u00a0the\u00a0colorless\u00a0ONU\u00a0technology. In\u00a0one\u00a0approach,\u00a0the\u00a0wavelength\u00a0of\u00a0the\u00a0ONU\u00a0transmitter\u00a0is\u00a0controlled\u00a0by\u00a0injection\u00a0of\u00a0a\u00a0“seed”\u00a0signal\u00a0into\u00a0the\u00a0transmitter\u00a0(e.g.,\u00a0a\u00a0wavelength-locked\u00a0Fabry-Perot\u00a0laser\u00a0or\u00a0reflective\u00a0semiconductor\u00a0optical\u00a0amplifier).\u00a0The\u00a0seed\u00a0signal\u00a0injected\u00a0into\u00a0the\u00a0transmitter\u00a0could\u00a0come\u00a0from\u00a0broadband\u00a0ASE\u00a0light\u00a0sliced\u00a0through\u00a0the\u00a0filters\u00a0in\u00a0the\u00a0system\u00a0or\u00a0from\u00a0a\u00a0DFB\u00a0laser\u00a0array.\u00a0In\u00a0a\u00a0self-seeding\u00a0version\u00a0of\u00a0this\u00a0approach,\u00a0the\u00a0seed\u00a0light\u00a0is\u00a0provided\u00a0by\u00a0feedback\u00a0of\u00a0broadband\u00a0light\u00a0from\u00a0the\u00a0transmitter\u00a0itself.\u00a0The\u00a0passive\u00a0filtering\u00a0of\u00a0the\u00a0seed\u00a0light\u00a0in\u00a0the\u00a0remote\u00a0node\u00a0determines\u00a0the\u00a0wavelength\u00a0of\u00a0the\u00a0ONU\u00a0transmitter. In\u00a0a\u00a0different\u00a0approach,\u00a0the\u00a0colorless\u00a0ONU\u00a0contains\u00a0a\u00a0singlemode\u00a0optic\u00a0coupler\u00a0wavelength-tunable\u00a0laser,\u00a0which\u00a0is\u00a0able\u00a0to\u00a0tune\u00a0to\u00a0the\u00a0appropriate\u00a0wavelength\u00a0that\u00a0matches\u00a0the\u00a0remote\u00a0node\u00a0filter\u00a0port. Below\u00a010-Gbps\u00a0channel\u00a0bit\u00a0rates,\u00a0the\u00a0injection-seeded\u00a0method\u00a0provides\u00a0a\u00a0cost-efficient\u00a0approach.\u00a0As\u00a0an\u00a0example,\u00a0a\u00a0wavelength-locked\u00a0Fabry-Perot\u00a0transmitter\u00a0can\u00a0be\u00a0integrated\u00a0into\u00a0an\u00a0MSA\u00a0SFP\u00a0pluggable\u00a0form-factor\u00a0module,\u00a0which\u00a0enables\u00a0the\u00a0use\u00a0of\u00a0third-party\u00a0CPE\u00a0devices.\u00a0A\u00a0modified\u00a0EDFA\u00a0gain\u00a0block\u00a0in\u00a0a\u00a070\u00d790\u00a0MSA\u00a0form\u00a0factor\u00a0could\u00a0be\u00a0used\u00a0to\u00a0generate\u00a0the\u00a0broadband\u00a0ASE\u00a0light\u00a0that’s\u00a0used\u00a0as\u00a0a\u00a0seed\u00a0signal\u00a0in\u00a0the\u00a0system. At\u00a010-Gbps\u00a0bit\u00a0rates,\u00a0tunable-laser\u00a0technology\u00a0offers\u00a0an\u00a0alternative\u00a0to\u00a0the\u00a0injection-seeded\u00a0approach.\u00a0The\u00a0tunable-laser\u00a0technology\u00a0developed\u00a0for\u00a0the\u00a0metro\/long-haul\u00a0market\u00a0has\u00a0matured\u00a0significantly\u00a0over\u00a0the\u00a0past\u00a0couple\u00a0of\u00a0years\u00a0and\u00a0is\u00a0able\u00a0to\u00a0give\u00a0a\u00a0good\u00a0cost-per-bit\u00a0ratio\u00a0when\u00a0high\u00a0capacity\u00a0is\u00a0needed. If\u00a0the\u00a0WDM-PON\u00a0system\u00a0is\u00a0properly\u00a0designed,\u00a0then\u00a0it’s\u00a0possible\u00a0to\u00a0mix\u00a0different\u00a0transmission\u00a0technologies.\u00a0By\u00a0following\u00a0certain\u00a0design\u00a0rules\u00a0during\u00a0the\u00a0installation\u00a0of\u00a0the\u00a0WDM-PON\u00a0system,\u00a0it’s\u00a0possible\u00a0to\u00a0allow\u00a0step-wise\u00a0channel\u00a0upgrades\u00a0to\u00a0higher\u00a0bit\u00a0rates\u00a0when\u00a0the\u00a0demand\u00a0arises.\u00a0These\u00a0design\u00a0rules\u00a0ensure\u00a0that\u00a0channel\u00a0OSNR\u00a0requirements\u00a0will\u00a0be\u00a0met\u00a0in\u00a0the\u00a0presence\u00a0of\u00a0reflections\u00a0and\u00a0that\u00a0inter-channel\u00a0crosstalk\u00a0is\u00a0avoided.\u00a0The\u00a0result\u00a0is\u00a0an\u00a0open\u00a0and\u00a0flexible\u00a0access\u00a0network\u00a0that\u00a0can\u00a0support\u00a0many\u00a0applications\u00a0and\u00a0services\u00a0over\u00a0the\u00a0same\u00a0infrastructure.\u00a0WDM-PON\u00a0thus\u00a0becomes\u00a0an\u00a0optical\u00a0option\u00a0for\u00a0the\u00a0access\u00a0network\u00a0as\u00a0and\u00a0where\u00a0it\u00a0makes\u00a0sense. Given\u00a0its\u00a0ability\u00a0to\u00a0help\u00a0service\u00a0providers\u00a0cope\u00a0with\u00a0current\u00a0bandwidth\u00a0demands\u00a0as\u00a0well\u00a0as\u00a0the\u00a0next\u00a0potential\u00a0broadband\u00a0access\u00a0bottleneck,\u00a0WDM-PON\/\u00a0100GHz\u00a0DWDM\u00a0Module\u00a0is\u00a0becoming\u00a0an\u00a0important\u00a0technology\u00a0to\u00a0consider\u00a0in\u00a0terms\u00a0of\u00a0its\u00a0benefits\u00a0and\u00a0market\u00a0timing.\u00a0As\u00a0with\u00a0any\u00a0emerging\u00a0technology,\u00a0service\u00a0providers\u00a0need\u00a0to\u00a0consider\u00a0the\u00a0optimal\u00a0strategy\u00a0for\u00a0initial\u00a0deployment\u00a0of\u00a0WDM-PON.\u00a0That\u00a0includes\u00a0how\u00a0they\u00a0could\u00a0use\u00a0WDM-PON\u00a0for\u00a0additional\u00a0network\u00a0applications\u00a0as\u00a0the\u00a0technology\u00a0matures\u00a0and\u00a0its\u00a0costs\u00a0come\u00a0down. \u00a0 WDM-PON technology FIGURE\u00a02.\u00a0Architectural\u00a0scenario\u00a0explored\u00a0in\u00a0the\u00a0collaboration\u00a0between\u00a0Transmode\u00a0and\u00a0Deutsche\u00a0Telekom\u00a0Hochschule\u00a0f\u00fcr\u00a0Telekommunikation. 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