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06 Oct 2015
What Are Optical Amplifiers

An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. Together with wavelength-division multiplexing (WDM) technology, which allows the transmission of multiple channels over the same fiber, optical amplifiers have made it possible to transmit many terabits of data over distances from a few hundred kilometers and up to transoceanic distances, providing the data capacity required for current and future communication networks.

Functions of Optical Amplifiers

Broadly speaking, optical amplifiers may be used within an optical network as boosters, in-line amplifiers, or pre-amplifiers. The following picture shows a simple WDM...



30 Sep 2015

A multiplexer, also known as data selector, is a device that selects one of several analog or digital input signals and forwards the selected input into a single line. Multiplexers are mainly used to increase the amount of data that can be sent over the network within a certain amount of time and bandwidth.

What is Multiplexer

The multiplexer acts as a multiple-input and single-output switch. Multiple signals share one device or transmission conductor such as a copper wire or fiber optic cable.In telecommunications, the analog or digital signals transmitted on several communication channels by a multiplex method. These signals are single-output higher-speed signals. A 4-to-1 multiplexer contains four input signals and a 2-to-1...



25 Sep 2015

OS1 and OS2 are two specifications for single mode fiber optic cabling. The differences between OS1 and OS2 fiber optic cables mainly lie in the performance due to cable construction. Only when you figure out the differences between them can you improve the functionality of the optical device. Here is some information related to the differences between OS1 and OS2 fiber optic cable.

Cable Construction

OS1 and OS2 are cabled optical fiber specifications. Category OS1 is appropriate to internal tight buffered cable construction, while Category OS2 is appropriate to a loose tube or blown fiber solution (where the cabling process applies no stress to the optical fibers). The loose tube cable is made from optical fiber and gives the best...



23 Sep 2015

As the use of fiber in premise networks continues to grow, so do the requirements for testing and certifying it. An optical time-domain reflectometer (OTDR) is an optoelectronic instrument in the characterization and certification of fiber-optic links (multi-mode and single-mode LAN/Ethernet). When choosing an OTDR, it is important to select the specific OTDR performance and features according to the required specification to qualify these links accurately. This article describes the key specifications that should be considered when choosing an OTDR.

OTDR

Dynamic Range

This specification determines the total optical loss that the OTDR can analyze, that is to say, the overall length of fiber link can be measured by the OTDR. The higher...



16 Sep 2015

Fiber optic patch cable, also known as fiber optic jumper or fiber optic patch cord, is an optical cable capped at both end with connectors and used to connect one telecommunication equipment to another. The optical connectors on the end of these patch cords shall be compatible with the connectors furnished on the optical device transmit and receive cards. Fiber optic patch cords are designed to interconnect or cross connect fiber networks within structured cabling systems. A fiber optic patch cord is constructed from a core with a high refractive index, surrounded by a coating with a low refractive index that is surrounded by a protective jacket. Fiber optic patch cable can be divided into different types based on different criteria.

02 Sep 2015

Fiber optic patch cable, also known as fiber optic jumper or fiber optic patch cord, is an optical cable capped at both end with connectors and used to connect one telecommunication equipment to another. The optical connectors on the end of these patch cords shall be compatible with the connectors furnished on the optical device transmit and receive cards. Fiber optic patch cords are designed to interconnect or cross connect fiber networks within structured cabling systems. A fiber optic patch cord is constructed from a core with a high refractive index, surrounded by a coating with a low refractive index that is surrounded by a protective jacket. According to the optical fiber used, fiber optic patch cable can be divided into two...



26 Aug 2015

In 1870, John Tyndall demonstrated the experiment of total internal reflection which proved that light can follow a curved path to shine around corners. This stimulates the later discovery that light will be totally reflected at the surface when it passes from air into glass at a right angle. This means that fiber made of glass can be used to transport light, thus the term optical fiber emerged. Since 1980s, optical fiber cable is gradually replacing copper cable as the mainstream medium of transmission in telecommunication network.

An optical fiber is a flexible, transparent fiber made of glass or plastic which can carry light from one end to the other. Its diameter is slightly thicker than that of a human hair. Optical fibers...



19 Aug 2015

In traditional optical fiber networks, information is transmitted through optical fiber by a single lightbeam. In a wavelength division multiplexing (WDM) network, the vast optical bandwidth of a fiber is carved up into wavelength channels, each of which carries a data stream individually. The multiple channels of information (each having a different carrier wavelength) are transmitted simultaneously over a single fiber. The reason why this can be done is that optical beams with different wavelengths propagate without interfering with one another. When the number of wavelength channels is above 20 in a WDM system, it is generally referred to as Dense WDM or DWDM.

What Is DWDM
DWDM, short for dense wavelength division multiplexing, is...


12 Aug 2015

With the economics-driven growth of global regional and local fiber communication network over the past few decades, the IEEE 802.3 ba 40-Gbps Ethernet standard was published in June, 2010. In order to meet the data transmission needs in the market, a high-performance and flexible implementation of the IEEE 802.32012 for 40-Gbps Ethernet - 40G transceivers are developed and widely used. The 40-Gbps Ethernet transfers data at a rate of 40 gigabits per second over Ethernet.

40G optical transceivers, compliant to the IEEE standards mainly include CFP and QSFP (Quad Small Form-factor Pluggable). CFP stands for C form-factor pluggable and it is a multi-source agreement to produce a common form-factor for the transmission high-speed digital...



06 Aug 2015

In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths of laser light. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity. A WDM system uses a multiplexer at the transmitter to join various signals together, and a demultiplexer at the receiver to split them apart When dealing with optical communication system, there are two main types of WDM systems which are used to transmit the necessary data: CWDM and DWDM.

WDM operating principle

Coarse Wavelength Division Multiplexing (CWDM) is the technology of choice for cost efficiently short-haul...