Special considerations specific to using FC connectors with an optical time domain reflectometer (OTDR).
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This video shows PCIe Gen3 operating as an active, eight lane aggregation pipe over an optical link, delivering a full 64Gbps (128Gbps bidirectional) performance. It uses the PLX PEX8748 Gen3 switch and Avago MicroPOD optical modules.

While downloading and uploading at same time. Getting speed at 4mb PTCL (not on fiber optics) Speed: Download≈ 800kB/s Upload≈ 1600kB/s Best ping i am getting is 10 ms and testing on Islamabad ≈ 250 Km
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Demonstration of the set up and testing of optical fibre using the Optronics OTDR For more Information about the Optronics OTDR visit www.aurigaeurope.com

Step by step tutorial for radiometric calibration of an Ocean Optics spectrometer using a bare fiber adapter. Users will have a calibrated system ready for taking measurements at the end of this video. For more information on calibration, view our white paper at www.oceanoptics.com
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The thick wave-division is replied and tested using optical device

Article by Keith Farren

Thick wavelength division multiplexing of foreword (CWDM) Considered as the city access network and realized the first-selected technology with width. Because it adopts the cost cheap, because of distributed feedback (DFB) Transmitting set and low-cost transmitting sets, economy multiplexers of the laser, do not need expensive inserting all multiplying system directly, so substitute dense wave division mutlipurpose (DWDM) A pole attractive alternatives. CWDM multiplexer is because of the mature thin film filter technology, it is the four -channel or eight -channel that the present commonly used port is counted. From the whole wavelength range of 1270~1610nm, can use 18 signal channels at most. Central wavelength 20nm apart of the signal channel. However, the signal channel whether CWDM network will dispose more than eight on 1470~1610nm in the future also has doubt. Especially, powerful OH absorbs the crest value around 1370~1430nm, will cause very high fiber attenuation, this will limit the transmission distance finally. In order to utilize CWDM to transmit such lower wavelength range, necessary installation makes OH absorb and reach the minimum new optic fibre, called ” the whole frequency band ” Optic fibre. However, it is very high course of a cost to install the new optic fibre, so will conflict with key requirement for the city access network. The bandwidth that the optic fibre only already installed offers is all used up, and dilate while nearly all adopting the new all-band optic fibre form, should use 18 -channel CWDM technology. Because of in city access network, prevent from smooth to insert amplifier and high power transmitter direct, and only use the low-cost receiver, so optical devices such as the multiplexer or add-drop module,etc. must meet the rigorous loss requirement. The higher the loss of the components and parts is, the lower the general systematic power budget tolerance is, the higher the nonserviceable possibility of the network is. So, loss the characteristic to having essential design and production of the passive CWDM device. We discuss accurate the intersection of test and strategy and so as to how about help to realize the goal of cost of CWDM device principle now.

CWDM components and parts test strategy CWDM multiplexes the device generally adopts the mature thin film filter technology. The thin film filter is made of crystal plate, deposit a plurality of alternate layers above, the layer is made of two or more different materials of refraction coefficient. Precise thickness of every layer is essential to characteristic of the device. In deposition, measure the transmission power change that the interference causes because of frequency spectrum through measuring, can examine the thickness of the device. After the deposition course, will generally check the crystal plate, confirm whether the area of the crystal plate accords with the predetermined loss characteristic template. Loss and lossing changing, bandwidth and cross talk characteristic in the fixed filter passband of this template. The fact proves, these kind of method to check crystal plate ahead of time can save the cost in production process in early period, because it has avoided cutting off and polishing the normal electric-wave filter cube of crystal plate of optical characteristic mismatch. On the score line and after polishing, will test the optical characteristic of the thin film filter in an all-round way. For this reason, the cube of thin film filter is put in the open light beam environment, adopting GRIN lens forms parallel beam. Test the electric-wave filter at the angle of zero degree. Through this way, can confirm the optical transmission characteristic and reflect the characteristic at the same time. This is very important, because besides replacing the thin layer, there is one to resist the reflected coating on the back of thin film filter on the cube, in order to avoid that the multiple reflection takes place from the glass air interface. The reflection effect will lead to the fact that transmit the fluctuation that can be seen in the characteristic. The electric-wave filter, to adopting automatic positioning equipment and mere feedback technique on time, real-time measurement transmits the characteristic in the course of aiming at. Then use the regulation to the incident beam of electric-wave filter of data control searched. Capsulating the good electric-wave filter in optics (the something small and hard) Will adopt the identical method when in the module. Here, will generally regulate the electric-wave filter, form light beam as several degrees of an angles of arrival, further reduce the influence of the interference. This kind of operation mainly points to reflected electric-wave filter frequency spectrum on another GRIN lens or other thin film filters. Through this way, can set up module and multiplexer of optical add-drop. Each electric-wave filter is only transmitted and chosen the frequency spectrum of partial incidence, and other frequency spectrum will be reflected. Whether the cube of electric-wave filter aims at the incident beam correctly, is determining the cross talk between the signal channels in Central wavelength and multiplexer of each signal channel. Once aim at and capsulate and finish, the last step in the production flow is finished product test. Here, will test the optical property of the whole module. Namely carry on standard measure, in order to win cross talk, band pass and loss characteristics such as changing, isolation, Central wavelength,etc.. Measure through increasing the relevant loss of polarization, can appoint all parameters, including polarization effect. Production flow and correlated with testing the common scheme is shown as in Fig. 1. Whether need to test in making procedure, output and cost requirement depending on manufacturer must meet the components and parts. The cost goal of CWDM device is much stricter than DWDM device. So, must test the cost according to the project setting of CWDM price. In view of essence, DWDM device test and difference between the intersection of CWDM and device test lie in wavelength and accuracy requirement, the intersection of cost and goal and wavelength range covered with of power. This may cause such a conclusion, namely the intersection of DWDM and device test and the intersection of CWDM and the intersection of device and test require different test equipment. But in fact, optic fibre test on the basis of very general principle, so-called ” encourage – respond to ” Test, it is unimportant whether the electric-wave filter is used for CWDM or DWDM. In addition, DWDM device tests the solution has already been offered 0.002dB or lower loss survey accuracy. This, in order to utilize DWDM to test the solution tests CWDM device has offered potentiality. Will discuss the measurement principle and realization in actual test will be employed as follows, among them we will discuss to test the possible solution of CWDM and DWDM device at the same time.

Distinguish and encourage responding to the measurement method and adopting tunable light source and broadband dynamometer in test philosophy and the latest wavelength of the solution, among them the tunable light source can be tuned within the range of whole wavelength continuously. This kind of method has overcome the wavelength definition of the spectrum analyzer to limit. The high-performance tunable laser has also limited spontaneous emissive influence, has realized very high dynamic range. In addition, while measuring the signal channel of multiterm at the same time, the tunable laser – dynamometer method has offered extremely high expansion ability and flexibility, can be with the lowest newly-increased cost, the as requested port quantity of apparatus regulates the test system, as shown in Fig. 2. This kind of method adopts the modular design, thus has offered a road for staging in the future, can increase more test functions, such as chromatic dispersion measurement,etc. while needing. Because if CWDM technical transfer rate is advanced from 2.5 Gb/s to 10 Gb/s, will demand to carry on chromatic dispersion measurement. Generally speaking, will carry on measurement by way of scanning, and will record wavelength and power information at the same time. Measure PDL, will increase a polarization controller, will control and incident the polarization of optical signal on the device under test. Usually use Miller’s method to carry on PDL measurement, this demands to export four kinds of particular polarization state. Through this way, can record and polarize associativity within the range of whole wavelength. This is because if check and polarize the impact on cross talk or band pass, demand to record and polarize associativity within the range of whole wavelength. It is very common that the above-mentioned schemes set up the structure, while testing the finished product, the module norm finished depends on testing the characteristic of the system. To while testing among the process, will usually reduce the performance requirement to a certain extent, in order to help to measure the speed, especially while regarding testing the solution as the optical feedback loop which aims at the procedure. Here, the key parameter is to upgrade speed and data retrieval speed. However, to the present test solution using tunable laser and dynamometer method, a limitation is that a wavelength range is limited, especially test application to CWDM electric-wave filter. Until recently, through using two or a plurality of tunable light sources, the required wavelength range of full coverage in conjunction, has just solved this kind of limitation, as shown in Fig. 3. Obviously, the relative great of cost of this kind of solution, in view of manufacturer’s present economic environment of most components and parts. The compromise usually uses the definite low-performance tunable laser of wavelength accuracy. This pair of CWDM electric-wave filter tests seem to be a valid method. Because the wavelength accuracy is not a key performance parameter. However, low-performance usually means the power stability is limited, shown as the power is changed as the wavelength is changed. If the intersection of random occurrence and the power change, can’t go on, normalize, cause and only increase the power monitoring instrument and satisfied with the rigorous loss accuracy requirement, and this will increase the cost which test the solution again. Finally, this kind of method has not brought cost efficiency and characteristic required, it is quite bad compromise. And can’t solve the problem that the ones that discuss test CWDM and DWDM device in the identical test solution above. Because the required high wavelength accuracy characteristic of the narrow-band filter in these low-cost tunable lasers usually can’t offer DWDM to employ. The new tunable light source can solve this problem now, these light sources are offered very high characteristic in wavelength accuracy and power stability, expand the coverage of wavelength 200nm at the same time, expand from 1450nm to 1640nm. It has offered the qualified power stability for lossing measurement, can realize very high precision. In addition, it does not need to make a plurality of tunable light sources, namely the whole wavelength range of the measurable quantity eight -channel CWDM multiplexer up, thus has saved the cost. And the cost of this kind of solution can be shared among many kinds of different electric-wave filters, thus the cost that makes each kind of electric-wave filter share reaches minimum, has met the cost goal of CWDM device on condition that reduced the precision. Compared with other solutions, the solution substantially as making up and using different light sources, use low-performance light sources or investing in differently meets different filtering and employs the demand (such as CWDM or DWDM),Investing in Gao and carrying the tunable light source has spanking rate of return on investment.

About the Author

For more information about these, please visit our website at www.hu-tui.com

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Using Sapphire Stones And Glass Ball In Industrial Techniques Has Brought Durability

Article by Shelly Srikrishnan

It is really amazing to know that a lot of industries are able to produce intricately designed and superbly finished products with the help of delicate and minute objects. In glass industries, in the making of medical equipments, in fibre optic gadgets, etc, glass balls are being used. Glass ball and ball lens of fully rounded or hemispherical shapes are used in place of bearings of steel.

Most of the applications that are using glass ball lens are shifting to this product due to very industrial reasons. Where, a fine balance of measurements is required, such as in valve mechanisms, the ball lens is being used. In medical equipments, like IV drip sets, sphygmomanometer, cylinders for anesthesia, and other precision instruments, the glass balls are becoming common.

Before the ball lens was introduced, the use of stainless steel balls was prevalent. As because, these steel balls were prone to corrosion by chemicals and drugs, they were replaced by balls and lenses made of glass. These balls were more durable and could resist high temperatures, more than around 600 degree F.

Another kind of balls, were also used, which were made of ruby stones. Ruby ball had the capability of providing a smooth finish and were free of erosive effects and their contour did not get edged. With the criterion of hardness and resistance to temperature, the sapphire stones are nowadays equally popular in various industrial set ups.

When there was the need of resistant and scratch free glass, the sapphire windows were used. Sapphire, like ruby could resist temperature and scratch, and hence the use of ruby insulator and sapphire insulator, in jewel cutting industry was justified. Moreover, they had a high refractive index and could refract light in variable directions. Use in optics and optical instruments are becoming rampant.

When the glass ball lens came into being, it was realized that things which could be more resistant and durable can also be used in different industries preparing medical equipments, optical instruments, handheld scanners, and such. These products were found to be very durable, had less chance of breaking, and could resist corrosion, thus making the sapphire and ruby items to be used in different shapes and purposes.

With the use of such chemical products in form of insulators, lens, cutters, etc, the companies could provide better quality products and at cheaper rates. People also realized the importance of their consumable goods being made of or consisting of glass, sapphire, ruby, etc, and they made it a point to procure these goods. The demand also, therefore, increased, with due increase in products and more and more companies using such innovative means to produce their finished goods.

About the Author

The Manufacturing company certified with ISO 9001:2000 quality system standard offering: sapphire window, Sapphire Stones, Sapphire Ball, Glass Ball, ruby ball, Ball lens, half ball lens

The benefits of using 21st Century Network

Relatively few people recognise the underlying complexity of the current telephone networking system that provides virtually all of the communications to businesses and residents in the UK. In its current form, there are 17 interconnected platforms which work together to form the slightly muddled nervous system of the industry and this layout has been created over the years as new technologies and platforms have been introduced to compliment or supplant those already in existence. The result is of course that BT has to spend a significant percentage of its budget in maintaining and repairing the disparate technologies, as well as keeping engineers trained in the use of them all. This drives up the costs associated with running BT and is not held to be a particularly useful or sustainable system in the longer term.

As such, BT is planning to introduce the 21st Century Network, or 21CN for short, which will merge all of the current platforms into a single, unified system which will be software driven and reliant upon Internet Protocols. As well as being more advanced in function because of the sophistication of the software, it will ideally be easier to manage and to maintain with simplified physical components requiring less work and being of greater consistency, providing a more reliable service for all.

BT recognises that in order to realise its plans for 21CN a vast amount of investment is required from both public funding and private investment and the technical challenge and potential legal roadblocks must all be tackled and defeated if success is to be achieved. It will take at least 5 years for the entire process to be completed, so it is not a light undertaking, but when 21CN is finally complete, every single person in the UK will be able to benefit from its faster, more efficient operation.

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BT has already begun work on creating the 21CN, with the completion of the main network which will handle all of the centralised telecommunications traffic. Fibre optic cabling is already in place in many areas, allowing businesses and home users to access high speed broadband services and enhanced telephone connections. Some 10 million households are currently within range of a newly upgraded telephone exchange, providing high speed connectivity using existing copper landlines for last-mile connection.

Users in the South of Wales have been able to successfully gain access to the voice services afforded by the 21CN technology, with more than 75,000 now signed up. These advanced services include the ability for voice messages to be scanned by special software which can quickly convert the content into a text format which can be read, stored and searched as with any other digital document.

For people who own and operate small businesses, the implications of the 21CN are significant, giving access to services that were previously viable only for much larger organisations. Costs of advanced telecommunications tools will fall thanks to the 21CN and the savings will be bolstered by increased revenues made possible by improved operating efficiency and streamlined customer services. It will even be possible for small businesses to implement self-service schemes that customers can use without the need for staff input, freeing up even more resources to help their businesses grow. Cloud computing for small businesses, that allows for services such as telephony and data storage to be handled remotely, is also going to be made possible once the 21CN has picked up momentum. The continued development of 21CN and the related technologies will no doubt be avidly followed by many business people.

To enjoy the benefits of a 21st century network with Numberstore on 0800 numbers, 0845 numbers and 0844 numbers. simply visit www.numberstore.com

How to Make Internet Phone Calls Using Your Home Broadband and Phone Line

For over 100 years, making a telephone call has relied on basically the same principle. Using antiquated technology, telephone calls from landlines have often meant poor quality voice clarity, crackly lines and high costs, particularly if you call international numbers on a regular basis.

But thanks to the Internet, all of that has changed. The broadband telephony revolution really started 15 years ago, with the development of software that allowed PC users to make calls via the Internet. Two predominant types emerged, VoIP and Skype. Although both technically use the same software application principles, the two systems have jostled for position ever since, with VoIP coming out as the current winner.

What is Skype?

Skype is a software application that lets users make voice calls via the Internet and their broadband connection. It was originally developed under the banner of The Skype Group and let users make free calls within the Skype service, while calls to traditional landline telephones and mobiles could be made for a small fee using a debit-based user account system. The package became popular because it offered additional features such as instant messaging, video conferencing and file transfer.

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Skype uses Voice over Internet Protocol (VoIP) technology, but unlike other VoIP packages uses its own particular protocol to allow users to connect to other Skype accounts. Initially popular, Skype seems to have reached a plateau in growth as other providers have developed their own VoIP protocols and comprehensive call plans to suit their customers needs.

Whats the alternative to Skype? A monthly VoIP call plan

The real alternative to Skype is to opt for a VoIP call plan. Call plans give you the option of creating a flexible user package, specifying particular countries that you would like to include in the package. This is particularly useful if you make repeated calls to one destination such as India or the United States, or if you make calls to several international locations but still want the convenience of using your existing handset. The issues with voice clarity and the worry of being disconnected in the middle of a call have been negated by the introduction of faster broadband speeds and better quality lines incorporating fibre optics. So in fact the quality of Internet phone calls is now probably better than using a traditional phone line.

VoIP uses a similar software protocol to Skype, but one of the key features of sending a message in small data packages through a broadband line is that not only is it faster, (hence the improved quality), but it is also more secure. One of the issues raised about Skype was the security of the data, with many people worrying that the Skype system left a backdoor open for anyone with access to listen in on conversations. Modern VoIP technology makes this practically impossible, ensuring that conversations are kept private.

Making Internet calls is now as simple as picking up your handset and dialling your chosen number. A small adapter can be fitted to most modern handsets, meaning that you do not have to replace your existing handset with a VoIP specialist unit. This has helped to bring the cost of VoIP down even further, making it an attractive package not only for business users, but for domestic customers too. With call plans that can be designed to suit the individual user, VoIP and making Internet phone calls is leaving the traditional landline system behind. VoIP and Internet calls are the future of telephony.