Communications LEDs are most commonly made from Indium gallium

Communications LEDs are most commonly made from Indium gallium arsenide phosphide (InGaAsP) or gallium arsenide (GaAs). Because InGaAsP LEDs operate at a longer wavelength than GaAs LEDs (1.3 micrometers vs. 0.81–0.87 micrometers), their output spectrum, while equivalent in energy is wider in wavelength terms by a factor of about 1.7. The large spectrum width of LEDs is subject to higher fiber dispersion, considerably limiting their bit rate-distance product (a common measure of usefulness). LEDs are suitable primarily for local-area-network applications with bit rates of 10–100 Mbit/s and transmission distances of a few kilometers. LEDs have also been developed that use several quantum wells to emit light at different wavelengths over a broad spectrum and are currently in use for local-area WDM (Wavelength-Division Multiplexing) networks.

Today, LEDs have been largely superseded by VCSEL (Vertical Cavity Surface Emitting Laser) devices, which offer improved speed, power and spectral properties, at a similar cost. Common VCSEL devices couple well to multi mode fiber.

A semiconductor laser emits light through stimulated emission rather than spontaneous emission, which results in high output power (~100 mW) as well as other benefits related to the nature of coherent light. The output of a laser is relatively directional, allowing high coupling efficiency (~50 %) into single-mode fiber. The narrow spectral width also allows for high bit rates since it reduces the effect of chromatic dispersion. Furthermore, semiconductor lasers can be modulated directly at high frequencies because of short recombination time.
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Commonly used classes of semiconductor laser transmitters used in fiber optics include VCSEL (Vertical-Cavity Surface-Emitting Laser), Fabry–Pérot and DFB (Distributed Feed Back).

Laser diodes are often directly modulated, that is the light output is controlled by a current applied directly to the device. For very high data rates or very long distance links, a laser source may be operated continuous wave, and the light modulated by an external device, an optical modulator, such as an electro-absorption modulator or Mach–Zehnder interferometer. External modulation increases the achievable link distance by eliminating laser chirp, which broadens the linewidth of directly modulated lasers, increasing the chromatic dispersion in the fiber. For very high bandwidth efficiency, coherent modulation can be used to vary the phase of the light in addition to the amplitude, enabling the use of QPSK, QAM, and OFDM.

Fiber optic is an important telecommunications infrastructure

Fiber optic is an important telecommunications infrastructure today, especially for business people who want high-speed connections to support the company's business processes. Besides having a high speed and can reach longer distances, optical fiber is also resistant to electromagnetic interference and radio frequency. So that data that moves through this media is guaranteed to be far safer from damage.

At present, there are many middle and upper class companies that are starting to leave the twisted pair cable media by switching to a fiber optic cable that is far more reliable for their network infrastructure. USTP / STP cable replacement with optical fiber is generally done on backbone cables and cables used in server / data center rooms. Therefore, the need for experts capable of installing network installations using fiber optic cable media is increasing day by day.

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Fiber Optic Training at the NetCampus Training Center

NetCampus Training Center provides adequate facilities and reliable instructors for those who want to add insight and expertise in computer networks, especially in the design and installation of indoor / outdoor fiber optic media for corporate networks. By joining this fiber optic training program , it is hoped that the participants will be able to understand various types of fiber optic materials, do the design, calculate the work BoQ and install the optical fiber media in the field.

In the last session of the fiber optic training program , participants are entitled to take the FO-301 certification exam. By taking and passing this certification exam, participants are entitled to obtain the NCFT (NetCampus Certified Fiber Optic Technician) degree as a validity of their expertise in designing and installing indoor and outdoor fiber optic media for corporate computer networks.

fiberOptics has some disadvantages among themis a very weak physical

form  of optical  fiber ,    so that when there is  pressure from outside yang yang excess can change its characteristics. For avoid  damping  that  big  then fiber joining  must  use  techniqueand high accuracy. (Thomas, 1995).  7. Optical Fiber Damping Damping atain ruga-ruga andang terjaon the fiber optics  caused  by  (Zanger,  1991,  Thomas,1995): • Loss absorption ( absorption loss ), due to     by  the  nature  of  optical materials  which are  not perfectly transparent. RuThis absorption is possible formulated as (Samuel, 1988): luptakeLoss ea−=  (6) where  α  = damping  coefficient per unit   long,  122 2(  without)core core ml n ni−= −   (7) l = light path length , θ      m  =  anglemaximum acceptance.

Journal of ISSN Industrial Engineering Systems: 1411 - 5247  Volume 7, No. 1, January 2006, hall. 87 - 91  • Scattering losses   ( scattering loss ),  causedvarying fiber  density during the process   the making of it. This  variation gives rise  the  refractive index  which is  modeled  as  objek small scattering. • Loss of flexion ( bending loss ), consisting of 2    namely macrobending and   microbe types   nding. Macrobending   occursdue to the  position of the fiber  thattoo songybring it upbecome refraction the light  came out  from the  core.  Whilemicrobending   occurs due to tekmechanical presence or during the withdrawal process kabel.  8. Optical Detector  Optical detectors  work  for  testingh signal  information  optics  into  signal    informationelectrically.
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 The detectors  are  must  meetrequirements as berikut (Singer, 1991, Thomas, 1995): • has high sensitivity  • have a CE response time pat • memiliki noise internal yang small  Characteristic  pentng  others  who  must filled with  stability,accuracy, not  sensitiveon temperature change, and the right price. There are two  types of optical detectors  usedin  the  communication systemfiber 

complete components found in optical fiber

Core
The core is the part called the glass fiber in the optical cable. This section has a diameter between 2 μm - 50 μm. And keep in mind, that the greater the core diameter of the optical fiber, the better the quality of the optical fiber itself.

* Also read:  fiber technician salary

Jacket or Cladding
Is a component that protects the core parts of water as well as things that might potentially interfere with telecommunications transmission. Usually the diameter of this jacket ranges from 5 μm - 250 μm. Besides functioning as a core protector, this component also functions to emit external light to the core.

Coat
The coat or usually also called this coating is not made of glass, but rather made of plastic. And this component also serves to protect the cable from interference conditions, such as air humidity so that the cable is not easily damaged. Usually, the coat is given a different color, of course, to make it easier to arrange the core sequence.

Strength Member and Outer Jacket
While the latter component is the main protector. In a sense, wrapping from the core, coat, and jacket. Of course its function is to protect the fiber cable from damage.

Working Principle of Optical Fiber

The working principle of optical fiber is described with the following explanation (Praja et al, 2013):
Working Principle of Optical Fiber
The initial signal / source in the form of an electrical signal at the transmitter is converted by an electrooptic transducer (Diode / Laser Diode) into light waves.

The light waves are then transmitted through the optical fiber cable to the receiver located at the other end of the optical fiber.
At the receiver / receiver this optical signal is converted by an optoelectronic transducer (Photo Diode) into an electrical signal again.

In the course of optical signals from the transmitter to the receiver there will usually be attenuation of light along the optical cable, cable connections and connectors in the device. Therefore, if the transmission distance is far away, we need one or several repeaters that function to strengthen the light waves that have experienced attenuation along the way.
Bibliography

Saydam, Gouzali. 1997. Basic Principles of Telecommunications Network Technology . Bandung: Space.
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Widodo, TS 1995. Optical Fiber Communication Optoelectronics . Yogyakarta: Andi Offset.
Putu, god. 2009. Optical Fiber in Computer Networks .
Sharma, P., Arora, Pardeshi, S. and Singh, M. 2013. Fiber Optic Communication; An overview . Certified Journal, vol. 3, no. 5, pp. 474-479.
Praja, Guntara Fajar, et al. 2013. Calculation Analysis and Measurement of Telkomsel Regional Central Java Fiber Optic Transmission . Bandung: National Institute of Technology.

Le manque de main d'oeuvre pénalise (encore) le secteur

Reste que la concurrence asiatique n'est pas le seul fait saillant relevé par le Sycabel pour s'expliquer cette baisse de régime du secteur. Le syndicat pointe également du doigt le manque de main d'oeuvre, qui pénalise l'ensemble des acteurs des télécoms et ralentit d'autant le déploiement des réseaux sur le sol français. Alors que tous les voyants sont au vert, que la barre des 4 millions de prises installées a été dépassé au troisième trimestre, l'offre de main d'oeuvre ne suit plus la demande.

"Il existe une tension des ressources en France : malgré les efforts que nous avons fait en anticipant la formation il manque encore 10 à 15 % de techniciens et de ressources pour être à l'aise dans le déploiement de la fibre en France et je ne parle pas que pour Orange mais bien pour l'ensemble du secteur", reconnaissait ainsi Fabienne Dulac, la patronne d'Orange France lors d'une rencontre avec la presse tenue début septembre.

"La  réussite du Plan France THD repose sur la disponibilité, partout dans l’hexagone, d’un nombre suffisant d’installateurs formés et qualifiés aux métiers du déploiement de la Fibre Optique, maitrisant les règles de l’art et les impératifs de la normalisation. Le respect des calendriers mais aussi la garantie de disposer de réseaux déployés de qualité et pérennes en dépendent", rebondit aujourd'hui le Sycabel, pour qui le problème est donc encore loin d'être réglé.
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Rappelons que si la fibre devrait, selon Infranum, s'imposer comme l’un des plus gros pourvoyeurs de nouveaux emplois en France, avec un prévisionnel de 6 400 recrutements, il en faudra entre 12 000 et 16 000 de plus d’ici 2022 alertent en effet les professionnels du secteur. Une gageure alors que le plan France THD ne mobiliserait pour l'heure qu'environ 14 500 emploi équivalent temps plein, pour 40 % dans le déploiement du FttH et 30 % dans le raccordement du réseau, selon les dernières données livrées par l'Observatoire du très haut débit.

The objective of an optical reflectometer (OTDR)

The objective of an optical reflectometer (OTDR) is to detect, locate and measure elements anywhere along a fiber optic link. Location information relating to loss and reflective events is generated. Technicians can thus know the characteristics of the fiber at the time of the test. With an OTDR, use leader / end coils to qualify the connectors at each end.

 A leader coil is connected between the tester and the fiber under test, and the end coil is connected to the other end of the fiber optic link. Please note: the optical fiber used in the starter and end coils must be identical to the fiber tested (type, size of the core, etc.).

Finally, proper planning and preparation are basic best practices for testing fiber optics. To make the fiber tests as efficient and precise as possible, you can also clean and test the equipment beforehand, check that it is calibrated, and above all check that it is equipped with the functions that will be useful in the field.

Fiber optics: broadband Internet everywhere, for everyone

Thanks to the development of broadband, we have long forgotten the noise of a modem that connects and the slow connection that accompanied it. With the deployment of fiber optics, the quality of Internet connection is taking a leap forward. What is it and how does it work?

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Broadband and very high speed connections have made communications smoother and faster. By transporting data at the speed of light, on a light signal conducted in a glass or plastic fiber thinner than a hair, optical fiber allows a throughput approximately 100 times higher than the ADSL network! This light signal can transport data over very long distances, almost without loss.