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Date Submitted Fri. Jul. 12th, 2013 6:41 AM
Revision 1
Syntax Master claireling
Tags add | con | Cross | drop | Filters | multiplexer | optical | WDM
Comments 0 comments
The OADM, or optical add drop multiplexer, is a gateway into and out of a single mode fiber. In practice, most signals pass through the device, but some would be ¡°dropped¡± by splitting them from the line. Signals originating at that point can be ¡°added¡± into the line and directed to another destination. An OADM may be considered to be a specific type of optical cross-connect, widely used in wavelength division multiplexing systems for multiplexing and routing fiber optic signals. They selectively add and drop individual or sets of wavelength channels from a dense wavelength division multiplexing (DWDM) multi-channel stream. OADMs are used to cost effectively access part of the bandwidth in the optical domain being passed through the in-line amplifiers with the minimum amount of electronics.

OADMs have passive and active modes depending on the wavelength. In passive OADM, the add and drop wavelengths are fixed beforehand while in dynamic mode, OADM can be set to any wavelength after installation. Passive OADM uses WDM filter, fiber gratings, and planar waveguides in networks with WDM systems. Dynamic OADM can select any wavelength by provisioning on demand without changing its physical configuration. It is also less expensive and more flexible than passive OADM. Dynamic OADM is separated into two generations.

A typical OADM consists of three stages: an optical demultiplexer, an optical multiplexer, and between them a method of reconfiguring the paths between the optical demultiplexer, the optical multiplexer and a set of ports for adding and dropping signals. The optical demultiplexer separates wavelengths in an input fiber onto ports. The reconfiguration can be achieved by a cross connection panel or by optical switches which direct the wavelengths to the optical multiplexer or to drop ports. The optical multiplexer multiplexes the wavelength channels that are to continue on from demultipexer ports with those from the add ports, onto a single output fiber.

Physically, there are several ways to realize an OADM. There are a variety of demultiplexer and multiplexer technologies including thin film filters, fiber Bragg gratings with optical circulators, free space grating devices and integrated planar arrayed waveguide gratings. The switching or reconfiguration functions range from the manual fiber patch panel to a variety of switching technologies including microelectromechanical systems (MEMS), liquid crystal and thermo-optic switches in planar waveguide circuits.

CWDM and DWDM OADM provide data access for intermediate network devices along a shared optical media network path. Regardless of the network topology, OADM access points allow design flexibility to communicate to locations along the fiber path. CWDM OADM provides the ability to add or drop a single wavelength or multi-wavelengths from a fully multiplexed optical signal. This permits intermediate locations between remote sites to access the common, point-to-point fiber message linking them. Wavelengths not dropped, pass-through the OADM and keep on in the direction of the remote site. Additional selected wavelengths can be added or dropped by successive OADMS as needed.

FiberStore provides a wide selection of specialized OADMs for WDM system. Custom WDM solutions are also available for applications beyond the current product designs including mixed combinations of CWDM and DWDM.
Date Submitted Fri. Jun. 28th, 2013 3:37 AM
Revision 1
Syntax Master claireling
Tags "19" | connect | cords | Cross | fiber | optic | panel | patch
Comments 0 comments
Fiber cross connect patch panel, also known as the fiber distribution panel, to terminate the fiber optic cable and provide access to the cable¡¯s individual fibers for cross connection, commonly used for fiber optic management unit. It helps network technicians in minimizing the clutter of wires when setting up fiber optic cables, organize and distribute the optical cables and the branches. They are used to secure the splice units, and connectors.

Benifit From Fiber Patch Panels
The fiber optic patch panels can accommodate connector panels, connectors, fiber optic patch cords, associated trunk cables, and usually come with cable management. With the use of fiber optic patch cables, network technicians can easily connect cable fibers via cross connection, test the patch panel, and connect it to lightwave equipment. These patch panels are also used as a link demarcation point and in labeling the cable¡¯s individual fibers.

Fiber patch panels provide a convenient way to rearrange fiber cable connections and circuits. A simple patch panel is a metal frame containing bushings in which fiber optic cable connectors plug in on either side. One side of the panel is usually fixed, meaning that the fiber cables are not intended to be disconnected. On the other side of the panel, fiber cables can be connected and disconnected to arrange the circuits as required.

A fiber optic patch panel is a built-in unit for fiber optics management. It has an appearance of a box enclosure. However, it does more than just serve as protection to several sets of fibers being used for communications. It can also serve as a mechanism in which you can handle the fibers easily and conveniently to serve your purpose. It is here that you can route fiber optic cables, add connections, or put a stop to its functions just as the ordinary junction box does to your electrical wires. With telephone companies, cable TV and Internet service providers now using fiber optics to deliver services to your home, you may find it necessary to install one of this in your home.

Componets Of Fiber Patch Panel
A fiber patch panel usually is composed of two parts, the compartment that contains fiber adapters (bulkhead receptacles), and the compartment that contains fiber optic splice trays and excess fiber cables. If the entire installation, including the fiber optic hubs, repeaters, or network adapters, uses the same type of fiber optic connectors, then the array can be made of compatible adapters or jacks.

The adaptors on a fiber-optic patch panel can come in a variety of different shapes. In most panels, all of the adapters are of the same type, but if there is more than one type of fiber optic connector used within the network, it may be necessary to get a panel with hybrid adapters. These types of adapters can be used to connect different types of connectors on fiber-optic cables.

Typical Types
There are two types of panels you can have. You can have either a wall-mounted one or a rack panel.

A wall-mounted device, which, in its most basic form, can keep 12 different fibers separate from one another. If the fiber-optic cable has more than 12 fibers, the extra fibers can be moved to a second panel or an engineer can use a panel that is designed to hold more fibers separately. Wall-mounted panels can be constructed to hold up to 144 fibers at once. Wall mount fiber patch panels are space saving and light in weight, while they are strong structure and robust, waterproof. The fiber optic cables lines are designed to be easy to find and organize, optical fiber bend radius is ensured to safe level not to affect its performance.

Rack mount fiber optic patch panels are made of high quality materials, it is sliding types like a drawer. Sliding the panel open gives an optical engineer easy access to the fibers inside.Inside the rack mount fiber patch panel there is trays and splice sleeves, accessories, optional pigtails with different types, common style is SC/FC/ST/LC, E2000 types can be custom made based on quantity.

Both of rack mount and wall mount fiber optic patch panels can be custom made with different kinds of adapters and Fiber Pigtails pre-installed from FiberStore. If you do not have enough space in your place and if you do not have too many fiber optic cables around, you can have your panel mounted on a wall. Otherwise, you will need a rack on which you can place your cable panel.
Date Submitted Mon. Jul. 6th, 2009 10:13 PM
Revision 1
Scripter Cloudgen
Tags Cross | JavaScript | Server
Comments 0 comments
a script that is able to load a remote script located in other server anytime it is need. See illustration