CWDM OADM (Coarse Wavelength Division Multiplexing Optical Add/Drop Module) is passive device to multiplex/demultiplex or add/drop wavelengths from multiple fibers onto one optical fiber. By making use of CWDM technology, individual channels could be optically added or dropped from the fiber pair while allowing pass-through people to continue unobstructed through the bus or ring.

Key Features:
Add/drop ITU-T G.695- and G.694.2-compatible CWDM channels onto a fiber pair;
Suitable for use in outside-plant fiber splice enclosures;
Upgradeable to 8 channels per fiber;
Provides low-loss pass-through for CWDM channels;
Thermally stable passive optics require no electrical power.

The CWDM OADM splice packs are a member of a family group of flexible, low-cost solutions that expand the capacity of existing fiber. CWDM OADM bidirectional splice packs provide both east and west add/drop functionality and they are readily deployed in existing outside plant splice enclosures. They supply ample room for fiber management and splice holders. The OADM connectors are interfaced to the color-matching CWDM GBICs around the equipment side. All the modules are similar size.

Structure
OADM includes three stages: an optical demultiplexer, an optical multiplexer, and together a technique for reconfiguring the paths between your optical demultiplexer, the optical multiplexer plus a pair of ports for adding and dropping signals. The optical demultiplexer separates wavelengths in a input fiber onto ports. The optical multiplexer multiplexes the wavelength channels which are to continue on from demultipexer ports with those through the add ports, onto one particular output fiber.

You will find four a variety of CWDM OADMs:

Dual Single-Channel OADMs (CWDM-MUX-AD-xxxx?aAllows you to definitely add/drop two channels of the wavelength in the two directions associated with an optical ring. Another wavelengths are undergone the OADM. Dual fiber is utilized for both the network along with the CWDM GBIC connections. Eight versions of this OADM can be obtained, one for each wavelength associated with. The twin single-channel OADMs are color coded and match the colour coding in the CWDM GBICs.

4 channel CWDM OADM (CWDM-MUX-4=)?aAllows you to definitely add/drop four channels (with some other wavelengths) into one direction of an optical ring. The other wavelengths are undergone the OADM. Dual fiber is utilized for both the network along with the GBIC connections. Some wavelengths are set to 1470 nm, 1510 nm, 1550 nm, and 1590 nm.

8-Channel Multiplexer/Demultiplexer (CWDM-MUX-8=)?aAllows you to multiplex/demultiplex eight separate channels into one couple of fiber. Dual fiber is used for both the network as well as the GBIC connections. The eight available wavelengths are 1470 nm, 1490 nm, 1510 nm, 15300 nm, 1550 nm, 1570 nm, 1590 nm, and 1610 nm.

Single-Fiber 4-Channel Multiplexer/Demultiplexer (CWDM-MUX-4-SFx=)?aAllows you to multiplex/demultiplex four separate channels into one strand of fiber. Dual fiber is utilized for the connections towards the GBICs and single fiber can be used to the network connections. The two models (CWDM-MUX-4-SF1= and CWDM-MUX-4-SF2=) can be used together to generate a four-channel single-fiber point-to-point link.

CWDM OADM is simply one in the CWDM passive optical system, another are CWDM MUX/DEMUX and CWDM GBIC. They offer optical networking support for high-speed data communication for metropolitan area networks (MANs) over the grid of eight CWDM optical wavelengths both in ring or point-to-point configurations.

 Passive Optical Network (PON) splitter optical plays an important role in Fiber to the network by getting one particular PON network interface to be shared among many subscribers. A PON network may be built with an individual optical splitter, or it can have two or more splitters cascaded together. These are the network elements that place the passive in Passive Optical Network and are avalable in many different split ratios, including 1:8, 1:16, and 1:32. These communication networks have enhanced capabilities which can be relied upon to take care of high-bandwidth multimedia applications and also prepare the network for rise in the long run.

 PLC Splitter (Planar waveguide Circuit) are developed using silica glass waveguide circuits and aligned fiber pigtails, divide a single/dual optical input(s) into multiple optical outputs uniformly. PLC splitter is designed for FTTx Passive Optical Networks, CWDM, DWDM and optical cable TV System, which is widely used in FTTX developments, PON networks, CATV links and optical signal distribution currently.

Splitters contain no electronics and use no power. They are the network elements that put the passive in Passive Optical Network and are available in a variety of split ratios, including 1:8, 1:16, and 1:32. The PLC splitters provide low-cost solution for optical signal distribution in PON network, with small form factor and superb reliability, meets various application requirements in different environments. The high quality performance including low insertion loss, low PDL, high return loss and ideal uniformity more than a wide wavelength range between 1260 nm to 1620 nm, and operate in temperature from -40℃ to 85℃.

PLC splitter is a high quality passive device. It is especially for passive internet (EPON, BPON, and GPON). The different splitter package meet people’s different requirement. There are three common used PLC Splitters, including bare PLC splitter, Blockless PLC Splitter and Rack Mount PLC Splitter.

Bare PLC splitter
Standard plc bare fiber splitter are with equal slitting ratio in 1XN and 2XN structure, 1X2,1×4, 1×8,1×16, 1×32 and 1×64 PLC Splitters, 2×4, 2×8, 2×16, 2×32 bare fiber PLC splitters.
Bare Fiber PLC Splitter Features:
Low insertion loss;
Low excess loss;
Low Polarization Dependent Loss;
High directivity;
Long haul reliability;
Customer defined specifications.

Bare Fiber PLC Splitter Applications:
Fiber to The Point (FTTX);
Fiber to The Home (FTTH);
Passive optical networks(PON);
Local Area Networks (LAN);
Cable Television (CATV);
Test Equipment.

Blockless PLC Splitter
Blockless PLC Splitter uses PLC & Package technology to split one wavelength into many ports, from 4 way to 32 way. It has no fan-out block so you can save space and achieve smaller splitter modules.

Rack Mount PLC Splitter
19" standard Rack Mount PLC Splitter is a key component in FTTH and is responsible to distribute the signal from CO to numbers of premises. The highly stable splitter performs superbly across temperature and wavelength providing low insertion loss, low input polarization sensitivity, excellent uniformity, and low return loss in configuration of 1x4, 1x8, 1x16, 1x32 and 1x64 port.

Ingellen provides a wide variety of 1xN and 2xN plc splitters, which can be designed for exact functions. Our PLC splitter products are without a doubt warranted to help you prime quality and even most beneficial rate. You can easily customize PLC splitter to suit your exact conditions.

 The fiber optical splitter, also known as beam splitter, is optical fiber tandem device with many input terminals and many output terminals, especially applicable to a passive optical network to connect the MDF and the terminal equipment, achieving the branching of the optical signal.

Fiber optic splitters enable a signal on an optical fiber to be distributed among two or more fibers. Since splitters contain no electronics nor require power, they are an integral component and widely used in most fiber optic networks. For example, a 1X4 LC type equal splitting ratio fiber optic splitter can split the fiber optic light signal into four equal 25% parts and sent to the 4 different channels, LC is the connector type on the splitters. Fiber optic splitter key parameters include the optical loss, splitting ratio, isolation, PDL, etc.

Fiber Optic Splitter Features:
Single Mode, multimode, and PM fiber types;
Multiple port configurations, custom length and cable diameters;
Various splitting ratios, 50:50 to 1:99;
Tube type or Box type, PLC fiber optic splitters or Fused fiber optic splitters;
PC, UPC, and APC fibre optic connectors;
Available with FC, SC, ST, LC and MU connectors.

Types
According to the optical splitter principle, it can be divided into FBT Splitter (Fused Biconic Tapered) and PLC Splitter (Planar Lightwave Circuit).

FBT Coupler, based on the traditional technology, making two (two or more) fibers removed the coating layer gather in a certain way, stretched to both sides under the heating zone at the same time. Form a double cone’s special waveguide structure, finally for getting a different splitting ratio, via controlling length of the fiber torsion angle and stretch. FBT splitters are widely accepted and used in passive networks, especially for instances where the split configuration is smaller (1x2, 1x4, etc). With the development of the technology, FBT splitters can be deployed in a cost- effective manner.

PLC Splitter is a micro-optical element using photolithographic techniques to form optical waveguide at medium or semiconductor substrate for realizing branch distribution function Technical Index.

With the latest technology, PLC splitters offer a better solution for applications when larger split configurations (1x16, 1x32, 1x64, etc) are required. To achieve this, waveguides are fabricated using lithography onto a silica glass substrate, which allows for routing specific percentages of light. As a result, PLC splitters offer very accurate and even splits with minimal loss in an efficient package.

FBT Splitter Compared With PLC Splitter
FBT Coupler are mature technology types, it is low cost and easy to make, but fused fiber optic splitters optical loss are sensitive to wavelength and this is a big disadvantage. PLC fiber optic splitters are small size and wide working wavelength, which are more reliable and suitable to use in passive optical network fiber optic splitting.

As the rapid growth of FTTx worldwide, the requirement of larger split configurations for these networks is increasing. Since the performance benefits and overall low cost of plc splitter, which serves mass subscribers, becomes the ideal solution for these types of applications currently.

 GBIC Transceiver( gigabit interface converter), one of the many types of transceivers, is a media conversion device between a gigabit Ethernet network and a separate fiber optic based network. Via the GBIC transceiver, Gigabit network equipment can directly connect to copper wires, single mode fiber ports or multimode fiber ports.

Main Features
Generally GBIC fiber optic end the interface is SC type, the laser unit in GBIC module can be 850nm VCSEL, 1310nm FP, 1310nm DFB, and 1550nm DFB. GBIC module can be changed from one type of external interface to another simply by plugging in a GBIC having the alternative external interface. The GBIC transceivers are suitable for interconnections in the Gigabit Ethernet hubs and switches environment. The design of these converters is also practical for other high performance, for example, point-to-point communication applications that involve interconnecting components and
exchanging data between Ethernet and fiber optic networks.

Changing from one type to another is simple because a GBIC transceiver can be removed and installed without turning off the power. Generalized enclosures may be compatible with various transceiver types. It is not complicated to operate, and the digital data transmitter and receiver functions at high speeds. Some models can provide a bi-directional data connection of up to 1.25 gigabits/second, so there is great compatibility with high-speed networks. Compatibility with common power supplies, such as +3.3 and +5.5 volt ratings, extends this compatibility even more.

Other important features of a GBIC transceiver which add to energy efficiency initiatives are that the unit offers low power dissipation and emits little electromagnetic interference. Each device can install and function without disrupting anything, but this plug and play capability can be offset by the need to disconnect patch cords before it is installed or taken out. Power surges and data discrepancies can occur, and it’s always wise to take precautions to avoid this as much as possible, especially in high-density networks.

Industrial Standard
GBIC has its multi sources agreement as the industrial standard, this help manufacturers save cost to develop their each own standard and solve the problem of compatibility. All of the different modules by various manufactures are developed based on industrial standard. This means that they can all be compatible with the same network and with each other to meet data communications requirements. By offering a standard, hot swappable electrical interface, one gigabit port can support a wide range of physical media, from copper to long-wavesingle-mode optical fiber, at lengths of hundreds of kilometers.

GBIC classification is based on its working wavelength, data transmitting rate, working power, and the working distance. The device is characterized by features, such as the wavelengths it can handle, how fast and efficiently it transmits data, the power it needs to operate, and what distance it can transmit data over. These are the main factors to consider when buying a GBIC transceiver to be sure it meets network performance requirements.

Ingellen supplies various kinds of GBIC fiber optic transceivers products, including single mode GBIC, multimode GBIC and copper GBIC with compatibale brands like Cisco, HP and so on. We have CWDM GBIC transceivers that are with different operation wavelength. Each GBIC Transceiver Module is compliant to industrial standard and they are compatible to use with fiber optical equipments from other major companies like Cisco, Juniper, etc.