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DWDM Passive Systems GEZHI DWDM passive systems represent a logical extension of the CWDM technology.  Wavelength division multiplexing of DWDM 100 Ghz systems occurs in a narrow range of 1525 nm – 1565 nm, with a pitch of only 0.8 nm between adjacent channels. The channel capacity of such systems may reach 20 channels when working via a single fiber and 40 channels when working via dual fibers. A special feature of the DWDM passive system is the absence of any active components. The line functions only due to the optical budget of transceivers used. No optical signal amplifiers and dispersion compensators are used. DWDM passive systems have a high channel capacity and potential for expansion, however, the transmission distance is limited to the optical budget of transceivers used. The main application of DWDM passive systems is metro networks, as well as high-speed communication lines with a high channel capacity. Unlike active backbone networks with amplifiers and dispersion compensators, the passive DWDM allows to arrange a high-speed system having high channel capacity with substantial cost savings. GEZHI DWDM Link: https://www.gezhiphotonics.com/dwdm-100ghz-200ghz-50ghz.html   System Capabilities: Transmission of up to 40 duplex communication channels; Support of all transmission protocols; Transmission of any kind of traffic; Arrangement of metro networks with high channel capacity. Optical Medium Features: Single/dual optical fibers; Maximum route length of up to 70 km depending on the channel capacity.

What is a Gigabit Passive Optical Network (GPON)? A Passive Optical Network (PON) is fibre-optic telecommunications technology that only uses fibre and passive components like splitters and combiners rather than active components like amplifiers, repeaters, or shaping circuits, to deliver broadband network access to end-customers. Passive optical networks cost significantly less than those using active components. A gigabit passive optical network (GPON) are currently the leading form of passive optical networks. A gigabit passive optical network is a point-to-multipoint access network and uses passive splitters in the fibre distribution network, enabling one single fibre connection to serve multiple end users. It achieves this with a passive optical splitter in a junction box, usually in the pavement/road manhole. Once it reaches the development or estate, where a cluster of end customers reside, a splitter is connected. From here, multiple fibre cables fan-out of the splitter connecting to homes via an Optical Network Unit (ONU). Encryption is used to keep each user’s data secured and private from other users.   Technical principlesof PON: GEZHI Photonics produce PON device like 1x2 , 1x4, 1x8 , 1x16 , 1x32 , 1x64 , 1x128 or 2xN Optical Splitter Patchcord : MPO, MTP, LC, SC, FC, ST, SMA, MU, MTRJ etc. Application mode 1 of PON technology: FTTH Applications: Newly-built high-grade residential, High-grade residential reconstruction, apartment villas Application Features: FTTH, No cooper outside the house, POP in every user’ home, each user own one ONT port, higher costs than FTTB and FTTN; providing various services and voice service can be realized through the internal IAD. Business Requirements: VOIP, Broadband service, HDTV, Visual communication etc. Conclusion: Adopting FTTH solution can fully satisfy the requirements of high bandwidth now and then, but the cost is higher. Application mode 2 of PON technology:FTTB (PON+LAN) Applications: Newly-built high-grade residential, High-grade residential reconstruction, apartment villas Application Features: FTTH, No cooper outside the house, POP in every user’ home, each user own one ONT port, higher costs than FTTB and FTTN; providing various services and voice service can be realized through the internal IAD. Business Requirements: VOIP, Broadband service, HDTV, Visual communication etc. Conclusion: Adopting FTTH solution can fully satisfy the requirements of high bandwidth now and then, but the cost is higher. Application mode 2 of PON technology:FTTB (PON+LAN) Applications: Restruction of old campus (Speeding up the broadband), online service of broadband in countryside (POP down); fiber and copper to the home Application Features: FTTN or FTTB, Keeping the existing copper for broadband service and voice service, and POP all in the building, cooper distance within 300~1000m, multi-user sharing ONT unit, Lower networking cost than FTTH, but higher than FTTB+LAN. Business Requirements: VOIP, Broadband service, HDTV, Visual communication etc. Conclusion: Making full use of the existing network source ,small adjustment for the networking ,flexibly meet the needs of old town ‘s restruction, saving fiber core and uplink data, satisfying the needs of integrated service at this stage and helping for further fiber expanding, lower costs than traditional reformation model of cables.