Category Archives: Fiber Optic Assemblies

Introduction of Some Common Passive Components In Fiber Optic Network

A passive optical network (PON) is a point-to-multipoint, fiber to the premises (FTTP) network architecture in which unpowered optical splitters are used to enable a single optical fiber to serve multiple premises. PON allows several customers to share the same connection, without any active components. The word “passive” here refers to those devices do not require electrical-to-optical or optical-to-electrical conversion during its operation. The common passive optical components include optical connectors, couplers/splitters, optical attenuators, isolators, circulators, filters, switches and OADM (optical add/drop multiplexer) etc. With the benefits of PON, it is now widely used by people as a promising solution for modern access telecommunication networks.

Common Passive Components
Optical connectors
Optical connectors, also called fiber optic connectors, is used for temporary or demountable joint connection of two pieces of optical fibers, cable or optical devices. There are many kinds of optical connector types which have been developed at different times, and for different purposes. The most commonly used connector types include ST, SC, FC, MTRJ and LC style connectors.

Fiber Optic Common Connector types

Coupler is an optical device that combines light from different fibers while splitter is an optical device that separates light into different fibers. In facet, in most cases, there is no difference between a coupler and a splitter, the function of the part is the same. The functional difference is created by which end you use as the input vs. the output. Example: 1×2 coupler/splitter, if the input side is on that of the single leg, it will split the signal down the two legs (splitter). Alternatively, if the input is send on the two leg side, the signal will be combined down the single leg (coupler). There are mainly two kinds of splitters: one is the traditional fused type splitter known as FBT coupler (or FBT WDM optical splitter), and the other is the PLC splitter based on the PLC (Planar Lightwave Circuit) technology. FBT coupler cost lower than the PLC splitter while the PLC splitter has a compact size and suits for density applications. In addition, according to its package, there are tray type, stainless tube type and rackmount box type.


Optical attenuators
Optical attenuators are devices that reduce transmitted light power in ia controlled manner. It is generally used in preserving a receiver from reaching saturation, wavelength power balancing, equalizing node power in multifiber-distribution network or testing. Optical attenuators can be divided into four types. They respectively are plug-style attenuators (with moving parts), in-line attenuators (without moving parts), fixed attenuators and variable attenuators.

optical attenuator

Optical isolators
Optical isolators are devices that prevents the propagation of back‐reflected light. Optical isolators transmit light only in one direction. They are used to block light transmission toward the laser, which is important for controlling noise because lasers are sensitive to inadvertent feedback at the same wavelength. The working principle of an Optical Isolator is based on two types of devices which work according to the properties of polarized light: Polarizers & Faraday Rotators.

optical isolator

Optical circulators
Optical circulator is an unidirectional (non-reciprocal) divices directing an optical signal form one port to the next sequentially in only one direction at a time. Optical circulator operated the same principle (Faraday rotators) as an isolator excepet for multiple ports, typically three or four ports. It is an useful element to construct optical add/drop components.

optical circulator

Optical switches
Optical switch is a device used to dynamically control the physical connections between input ports and output ports. There are many kinds of optical switches according to their fabrication technology. The most common types of optical switches are opto-mechanical optical switch, MEMS (Micro-Electro-Mechanical Systems) optical switches and magneto-optic switches etc. They are mainly used in optical fiber loop, automatic measurement, optical fiber network remote monitoring, light path switching, system monitoring, laboratory research and development, transplanting multiplexing, optical path monitoring system with dynamic configuration, ring road protection switch test, optical fiber sensing system, optical device testing and research and so on.


Passive Optical Components Solution
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Optical divider and connector market strong demand

In many related policies, driven by large-scale light in to the copper retreat has unfolded, with FTTx substantive, ODN products becoming an important part of FTTx
system, may also be the expansion opportunity.

In line with the statistics, the proportion of ODN access equipment investment taken into account 50% ~ 60% of FTTx equipment investment.Could be predicted the years
in the future our country ODN access device how big the marketplace will keep growth trend in excess of 20%, to 2012, how large the marketplace is predicted to attain
14.55 billion yuan.ODN access products are usually made from optical divider, optical connector and also the equipments install these elements (housing, terminal box,
etc.).ODN core technology is mainly manifested within the optical divider, optical connector, passive optical components products.

Bypass the marketplace popular

PLC (planar optical waveguide technology) optical divider is primarily utilized in FTTH user access network, global curiosity about PLC optical divider in ’09 about
3300 wantong, annual rate of development of 32%.Global markets presents different pattern in various area, Japan, Columbia following a curiosity about high-speed
development for quite a while, has become approaching the gentle, demand is pretty stable, makes up about about 50 % from the share of the market;The outcome from the
economic crisis in the usa, influenced by a specific momentum;And developing countries for example China, India, Brazil’s FTTx a fast-growing construction phase, thus
end up being the main growth reason behind the marketplace.

Using the development of our country FTTx, planar optical waveguide technologies have get to be the growth and development of optical communication industry.PLC market
a hot, many are very bullish on passive optical device manufacturers, will be ready to mount the PLC program.Right now, the PLC in the leading manufacturers of optical
communication technology, rich and rich science, and science, etc.

PLC products around the massive in China telecom and China unicom bidding, driven by domestic PLC market, an order income growth is powerful.Through the 12th five-year
plan, operators will accelerate the FTTx network deployment, that will effectively promote the domestic market requirement for passive components, PLC products since
the core device of FTTx, will get a large amount of applications, inside the global share of the market is predicted to assist enhance.

PLC could be the core from the optical divider chip, the chip is essential to produce and manufacture.Recently, we’ve already had some light components enterprises
successfully on PLC chip encapsulation, most foreign enterprises also transfer chips to the country to encapsulate, these conditions to build up PLC optical divider
industry has built favorable conditions.

The connector has huge potential

Requirement of global optical connector in 2008 to 2008, increased by 11% in the year earlier, last year to a single.04 billion.The downstream applications for instance communication, optical network market demand growth, the influence of is anticipated to achieve 1.63 billion by 2012.

Global optical connector within the consumer market, the American companies are the largest.The oldest along with the future development potential may be the Asia Pacific markets.While using advancement of optical fiber cable technology increase the risk for optical fiber gets closer and nearer to the final outcome user, the shorter links, including board interconnection relating to the needs in the growing, thus promoted greatly rise in the quantity of the connector.

This season countries for the policy within the development and integration of optical communication industry will heighten the size the domestic market of optical fiber connector, promote the introduction of domestic optical fiber connector industry.Domestic industry restructuring and three g licensing as well as other factors to market regarding the optical communication network, the resulting including light to the copper back, “FTTx” and so on the most recent market demand, is a big market possibility of optical fiber connector.

Based on China electronics industry association information center, 2009, 280 million optical fiber connector in the domestic market demand, domestic optical fiber connector from 2010 to 2015 how large industry demand will probably be around 12.6% growth, demand will reach 2012, 410 million.As fiber optic broadband network large-scale construction start, therefore, three major telecom operators entry to the building construction is anticipated being orderly development of optical network, optical fiber connector market scale continuously grow.

(Related articles:DWDM CWDM,CWDM Demux,DWDM OADM)