Gezhi Photonics (Shenzhen) Technology Co., Ltd.

2~18CH CWDM MUX/DEMUX Module from GEZHI Photonics The key components in a WDM system are the optical wavelength multiplexer (MUX), and the de-multiplexer (DEMUX). In general, a CWDM (coarse WDM) MUX/DEMUX deals with small numbers of wavelengths, typically eight, but with large spans between wavelengths (spaced typically at around 20nm). A DWDM (dense WDM) MUX/DEMUX deals with narrower wavelength spans (as small as 0.8nm, 0.4nm or even 0.2nm), and can accommodate 40, 80, or even 160 wavelengths. The one kind of GEZHI Photonics LGX CWDM MUX/DEMUX modules are bi-directional passive optical multiplexers and de-multiplexers, allowing multiple optical signals at different wavelengths to pass through a single optical fiber strand. The second GEZHI Photonics ABS CWDM MUX/DEMUX modules are duplex fiber link bi-directional multiplexers and de-multiplexers, allowing multiple optical signals’ at different wavelengths to pass through duplex optical fiber. The last one kind is simplex directional CWDM MUX only or CWDM DEMUX only. The kind of mux and demux must be used with each other. CWDM MUX/DEMUX solution lets operators make full use of available fiber bandwidth in local loop and enterprise architectures. Our CWDM MUX/DEMUX modules split up to 18 channels (20 nm spaced) to a single fiber. The standard packages are ABS Plastic Box, 19″ Rack Mount Chassis CWDM Mux/Demux and LGX Metal Box Mux/Demux. No matter what kinds of connectors (such as FC, ST, SC, LC, etc.) are all available and we can also mix connectors on one device. CWDM MUX+DEMUX 8 Channels (Dual Fiber) Module GEZHI Photonics offers a wide range of WDM (Wavelength Division Multiplexing) optical networking products that allow transport of any mix of services from 2Mbps up to 100Gbe over dark fiber and WDM networks providing for the entire set of the most demanding CWDM and DWDM network infrastructure needs.

CWDM cost efficient transport in optical networks Coarse Wavelength Division Multiplexing (CWDM) is the technology of choice for cost efficiently transporting large amounts of data traffic in telecoms or enterprise networks. Optical networking and especially the use of CWDM technology has proven to be the most cost efficient way of addressing this requirement.   CWDM typically has the capability to transport up to 16 channels (wavelengths) in the spectrum grid from 1270 nm to 1610 nm with a 20 nm channel spacing. Each channel can operate at either 2.5, 4 or 10 Gbit/s. CWDM can not be amplified as most of the channels are outside the operating window of the Erbium Doped Fibre Amplifier (EDFA) used in Dense Wavelength Division Multiplexing (DWDM) systems. This results in a shorter overall system reach of approximately 100 kilometers. However, due to the broader channel spacing in CWDM, cheaper un-cooled lasers are used, giving a cost advantage over DWDM systems.   Transmode uses both CWDM and DWDM technologies as a means of transporting different types of services, e.g. Ethernet, SDH/SONET, and Fibre Channel (FC) in metro networks. CWDM is the most cost efficient of the two WDM variants, but has limitations in the distance over which the traffic is transported and in total channel count. With Transmode CWDM solutions, the distance supported is up to 100 km.   Both Transmode’s TM-Series and TS-Series product families are CWDM and DWDM agnostic. This means a CWDM network can initially be deployed with either product series and when required, the network can be simply upgraded to a hybrid CWDM/DWDM network using common cards and pluggable optics. Therefore, by deploying Transmode’s CWDMor DWDM based solutions the lowest possible day 1 cost are enabled without sacrificing the scalability of the network.

CWDM Passive System with active CWDM SFP transceiver CWDM passive system with the "point to point" topology is designed to organize the extraction and addition of optical signals at predetermined wavelengths from a communication line. There are several construction options for such systems: 1. Setting up communication between the head-end station and terminal nodes that are interconnected with single/dual fibers. The principal feature of this solution is to use of one "head"multiplexer (MUX) and several "terminal" add/drop multiplexers(OADM), which ensure the optical signal extraction at any path point. 2. Arranging a dual-sided system where two multiplexers (MUX) are connected with single/dual fibers. In this system, both single-sided and dual-sided add/drop multiplexers (OADM) providing transmission of signals in either direction are used. The maximum number of spurs is determined by the number of duplex transmission channels (2 to 18) and the optical line budget. OADM modulesused in these systems add optical signal attenuations, which lead to an overall reduction in the path length. In the systems under consideration, 18 transmission channels and 18 extraction points can be arranged as a maximum. CWDM systems can transport 18 wavelengths (1270~1610nm) with a channel spacing of 20nm. In custom application typically use 1470 to 1610nm in the spectrum grid. Compare with DWDM, CWDM has a wider channel spacing than DWDM. System Capabilities: Organization of up to 18 signal output points; Support of all transmission protocols; Transmission of any kind of traffic: data, voice, multimedia. Transmission Medium Features: Single/dual optical fibers; Maximum route length of up to 90 km (depending on the number of output points and fiber-inserted attenuations); Maximum value of fiber-inserted attenuations of about 30 dB (depending on the number of implemented channels).