We use electronic couplers all the time: such as a telephone coupler which lets you connect both a telephone and a fax machine to the same telephone line. Or a CATV coupler which lets you connect several TV sets to a single cable from Comcast. Basically you can buy these couplers from Home Depot or other electronic retailers.

Optical couplers have the same functionality as electronic couplers: They split the signal to multiple points(devices). Fiber optic couplers are needed for tapping(monitoring the signal quality) or more complex telecommunication systems which require more than simple point-to-point connections, such as ring architectures, bus architectures and star architectures.

:: Passive couplers and active couplers

Fiber optic couplers can be either active or passive devices. The difference between active and passive couplers is that a passive coupler redistributes the optical signal without optical-to-electrical conversion. Active couplers are electronic devices that split or combine the signal electrically and use fiber optic detectors and sources for input and output.

:: The difference between electronic couplers and fiber optic couplers

Electronic couplers are easy to make because electric current flows as long as you have physical contact between conductors. But optical signal is in a completely different domain. You have to align the tiny optical fiber cores precisely (9um for single mode and 50um or 62.5um for multimode fibers), so there won’t be a huge power loss when you split the signal.

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The Micron device includes deep-trench isolation, polysilicon waveguides, grating couplers, filters, modulators, and detectors. Fully functional on-chip CMOS enables transmit/receive operation while minimizing interconnect parasitics. With the addition of an external 1280 nm light source, a fully functional optical link (5 Gbit/s with 2.8 pJ/bit), capable of WDM (wavelength division multiplexing), has been demonstrated. In addition to the polysilicon resonant detector used in the link, a monolithically integrated silicon-germanium (SiGe)-based photodetector using selective epitaxial growth was also developed.

From the abstract: “Other research groups have published on SOI devices or ‘stand-alone’ silicon photonics (i.e. not monolithically integrated). This paper is different in that, for the first time, a working optical link has been demonstrated on an economically feasible (specifically for memory) CMOS platform. Today, 3D integration is a major industry focus in part due to the power and performance requirements of chip-to- chip I/O. While 3D integration is important, this research shows a clear alternative path that has significant benefits.”

The result is a monolithically integrated optical chip-to-chip link that transmits 5 Gbit/s over distances up to 5 m long (via fiber link).

Other photonics-related presentations
A group from National University of Singapore and Nanyang Technological University will present “Germanium-Tin on Silicon Avalanche Photodiode for Short-Wave Infrared Imaging,” in which a monolithic, CMOS-compatible germanium-tin on silicon (Ge1-xSnx/Si) avalanche photodiode (APD) for short-wave infrared (SWIR) imaging is reported that has a lower thermal sensitivity than conventional III-V-based aAPDs.

Researchers from Taiwan Semiconductor Manufacturing Company will present “Advanced 1.1 ¦Ìm Pixel CMOS Image Sensor with 3D Stacked Architecture,” in which they describe their 1.1-¦Ìm-pixel backside-illuminated CMOS image sensor with a 3D stacked architecture. The carrier wafer in conventional BSI is replaced by an ASIC wafer, which simplifies fabrication and improves dark performance.

A team from MIT and the University of Colorado, Boulder (many members of whom also worked on the Micron Technology device) will present “A Monolithically-Integrated Optical Transmitter and Receiver in a Zero-Change 45 nm SOI Process.” Here, according to the abstract, “an optical transmitter and receiver with monolithically-integrated photonic devices and circuits are demonstrated together for the first time in a commercial 45 nm SOI [silicon-on-insulator] process, without any process changes. The transmitter features an interleaved-junction carrier-depletion ring modulator and operates at 3.5 Gbit/s with an 8 dB extinction ratio and combined circuit and device energy cost of 70 fJ/bit. The optical receiver connects to an integrated SiGe detector designed for 1180 nm wavelength and performs at 2.5 Gbit/s with 15 ¦ÌA sensitivity and energy cost of 220 fJ/bit.”.
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The study from ElectroniCast Consultants, Aptos, CA, USA, covers three categories: single lens assemblies; 2-12 lens arrays; and arrays with more than 12 lenses. Both of the lens array categories are forecast with strong growth rates of more than 45% per year. Single lens fiber optic collimator assemblies hold the global market share lead in the selected optical communication applications covered in the study.

¡°Collimator lenses and lens assemblies are used in a variety of photonic products; however this market study forecasts the use of micro-sized collimator lens assemblies, which are used specifically in optical communication devices. Sales of fiber optic collimator lens assemblies act as a key indicator of the growth of the fiber optic communication component industry,¡± said Stephen Montgomery, Director of the Fiber Optic Component group at the California-based consultancy.

The global consumption of fiber optic collimator lens assemblies, for commercial optical communications, reached $264.2 million in 2013 and is forecast to reach $298.4 million in 2014, a rise of 12.9%.

The American and APAC regions are forecast to remain relatively close together in relative consumption value market share. The Europe, Middle East and Africa regional segment will see the fastest average annual growth rate during the forecast period.

Collimator applications

Fiber optic collimator lens assemblies are widely used to covert a divergent output laser beam from a fiber or waveguide into an expanding beam of parallel light; therefore, they are used in a variety of optical communication components, such as: modulators, attenuators, transmitters, pump laser modules, switches/optical cross connects, wavelength selective switches, ROADMs, isolators, circulators, expanded-beam connector assemblies, optical filter modules, DWDM, tunable filters, optical sensors, optical signal processing, integrated/hybrid packaged modules, and other active and passive components and devices..
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Worldwide fiber-optic broadband service revenue grew over 15% to $ 46 billion in 2013. Operators such as British Telecom from the UK and VimpelCom from Russia reported that growth in its fiber-optic broadband customers contributed to overall service revenue growth in 2013. “Since revenue from traditional services such as voice and messaging is declining, innovative services and content over high-speed broadband networks are proving essential for operators to maintain overall service revenue growth. ABI Research forecast that the worldwide fiber-optic broadband market will generate $ 100 billion in 2019, “noted Khin Sandi Lynn, industry analyst.

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As a matter of fact, the whole fiber optic technology makes use of optical fibers. These optical fibers are thin, ultra-flexible and transparent and transmit the light between two ends of the fiber quality as compared to copper wire. So, with their superior technology these are more appropriate for smooth communication between far distances. In addition to it, the usage of these cables results in much less loss of signals which means uninterrupted and smooth communication. To tell you the truth, currently more than 80% of far distance data traffic is transmitted by using this smart optical fiber technology. Total internal reflection through a light source transmitted by a fiber cable is the main principal on which whole fiber optic communication is based. Mainly, quality plastic material is used for making these cables. However, these can be made from plastic clad silica or glass in accordance with the budget and application for which these cables are being used. Copper wires used electronic signals to transmit signals whereas light pulses are being used in fiber optics cables to transmit signals.

Other advantages of fiber optic cables include it is inexpensive and suits properly to extremely thin diameters in the range between 0.8mm to 40mm. Being extremely thin, a number of fibers can be joint together letting many connections to run in the same cable. It provides clearer phone connections as well as TV receptions, as the light signals which are in the same cable do not hamper each other’s functioning. This ultimately results into much less loss of signals. These cables can also be called as the safer ones because no electricity passes through these cables and hence there will not be any fire issues.

In comparison with other wires like copper wires, these cables are definitely the superior ones because these are light weighted and small sized. With above mentioned advantages, it’s evident that why fiber optics cables are being used in many telecommunications and computer networks. These cables are regarded as the most trusted and best replacement of copper wires.

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As SFP+ (enhanced small form-factor pluggable) becomes more pervasive,we want to know it more and more easy.Just as its name implies, the SFP+ transceiver is an upgraded version of the small form-factor pluggable transceiver. The SFP+ Transceiver is more compact in size than its predecessors, X2, XENPAK and XFP, making it the perfect solution for higher port density installations. Fiberstore supply the SFP+ transceivers are also not only efficient, but cost effective, with a power consumption of less than 1W.

The SFP+ module is a variant of the SFP optical transceiver. The SFP+ module form factor is 30% smaller, uses less power, requires fewer components, and is less expensive than the 10-Gigabit small form-factor pluggable module (XFP) form factor, which was already smaller and used less power than the XAUI-based XENPAK and X2 form factors.

The SFP+ form factor significantly simplifies the functionality of the 10G optical module by moving such functions as clock and data recovery (CDR), electronic dispersion compensation (EDC), 10G SERDES, and signal conditioning that traditionally resided inside the XAUI-based modules into 10GbE PHY devices and line cards. As a result, the modules are smaller, consume less power, and allow increased port density while being less expensive than XFP. Some products on the market now offer 48 ports or more in a rack.

Each SFP+ module houses an optical transmitter and receiver. One end of the module is an SERDES framer interface (SFI) serial interconnect, which handles differential signals up to 10 Gbits/s. The other end is an optical connection that complies with the 10GbE and 8GFC standards. The SFP+ active cable has electrical input and outputs with an optical transmitter and receiver internal to the cable. Active cables with SFP+ terminations also can be copper-based with integrated pre-emphasis and equalization..
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A power converter is a device that performs the three functions as given below:
1.AC to DC conversion
2.DC to DC conversion
3.Power supply

How a Power Converter Works
Knowing how a power converter works is important. A power converter assembly consists of numerous electronic components that enable power conversion. Computer components work on DC voltage, but electricity home supplies ranges from 100V to 120V in North America, some parts of South America, Japan and Taiwan. For the rest of the world, it spans between 200V to 220V. The power converter unit receives electricity supply from the main source and converts AC voltage into DC voltage of 12V and 5V, respectively. Most computer peripherals utilize this power range.

However, some small computer components require phantom power of 3.3V. To meet this requirement, power unit converts 5V DC to 3.3V DC. Once the specified voltage is generated, it is relayed to specific components through the power rails comprising varying volt capacity. It can be 12V rail or 5 V rails.

Power Converter and High Power Requirements
Power supply function has to mitigate any probability of overheating, particularly for 12V rails. The wattage for a rail is calculated through multiplying volts by amperes. The result of this equation should not exceed maximum resistance capacity for the rail. Most power units relay 18 amperes current on 12V rail. However, graphic cards and central processors have higher power requirements. To meet this requirement, while preventing overheating, multiple 12V rails are used for power relay simultaneously.

Switched-mode power supply (SMPS) method is extensively utilized in power converters to increase efficiency. This method allows high-speed electronic switching by eliminating the use of transformers.

Power Converter: Modular Power Supply (MPS)
While assembling a computer system’s power components, most hardware engineers face a tough time due to multiple power cables. Although cabling runs on color identification system, identifying the correct one is far from easy.
Further, modular power supply systems have evolved to customize the output supply from a power converter. A modular power supply unit has isolated output modules to:
1.match specific power requirements
2.prevent overheating
3.increase air flow
4.reduce fan obstructions due to multiple cables

CyPower is an authorized distributor of reputed power component manufacturers. For accurate and up-to-date information on power converters, visit www.cypower.com..
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After i took my inner medication boards, I felt in leading type clean from residency, getting studied intensely for 6 months. Following I handed in my final examination booklet, I breathed a sigh of reduction that my profession of exam-taking had lastly ended. Now I could concentrate on really becoming a physician, and by no means need to encounter a No. two pencil or optical scan sheet once more. But then the American Board of Inner Medication recognized that a one-time examination was not adequate for maintaining tempo using the fast improvements in medication, and therefore the recertification procedure was initiated, necessitating physicians who certified in or following 1990 to retest each ten many years. Component from the recertification procedure was a sequence of open-book exams that mimicked the actual globe of medication, because most physicians routinely seek advice from publications, journals and colleagues when confronted with challenging concerns. But there would even be an old-fashioned actual examination. I bought the requisite research guides daunting, densely worded treatises on gastroenterology, cardiology, geriatrics, hematology and all of the specialty locations of inner medication. The majority of the subjects went into significantly much more depth than I’d at any time experience in my common apply. I questioned why I required to memorize the second-line therapy for scleroderma renal crisis, when any internist really worth their salt would refer to some nephrologist for first-line therapy of this uncommon illness? Nonetheless, bolstering my health-related understanding appeared like a worthy endeavor. The issue was that this time about I had a couple of small impediments to intensive learning a active medical apply, educating duties, 3 youthful kids. However the biggest impediment turned out to become that I would misplaced my learning and test-taking abilities. In health-related college, I had routinely dedicated limitless mnemonics, acronyms and equations to memory. There appeared to become a unique component from the mind devoted exclusively to cramming details, regardless of how irrelevant or ridiculous, and retaining them just lengthy sufficient to total the examination. But I hadn’t utilized that component of my mind inside a ten years. In medical apply and adulthood in common understanding is really a sluggish amalgamation of expertise, studying, dialogue, mulling more than. I used to be completely from form when it arrived towards the fast assimilation of details. This was a dispiriting realization, as I confronted 800 pages of single-spaced evaluation materials. The weeks and months handed in misery, as I shoveled in piles of details. It felt liked becoming force-fed Thanksgiving leftovers endlessly. Health-related understanding, within the actual globe, is really a mixture of expertise, sifting via present analysis, talking about instances with colleagues. You will find exhaustive databases that include all these details that we utilized to memorize. .
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There are two approaches to optical signal modulation and recovery. The first type is IMDD (Intensity Modulation Direct Detection) and the second type is Coherent Detection. In IMDD, the optical source intensity is modulated by the microwave signal and the resulting intensity modulated signal passes through the optical fiber to a photodiode where the modulation microwave signal is converted back to electrical domain. In Coherent Detection, the optical source is modulated in intensity, frequency or phase by the microwave signal. The modulated signal passes through the optical fiber to the receiver where it is mixed with the output of a local oscillator (LO) laser. The combined signal is converted to electrical domain using a photodiode. This produces an electrical signal centered on the difference frequency between the optical source and the LO laser (i.e. intermediate frequency). This signal is further processed to recover the analog microwave signal.

RFoG (Radio Frequency over Glass) is the cable operators’ implementation of microwave transmission over optical fiber in which the coax portion of the HFC (Hybrid Fiber Coax) is replaced by a single fiber, passive optical network architecture (PON). RFoG allows cable operators to deploy fiber connectivity to customer premises (FTTP) while keeping its existing HFC and DOCSIS infrastructure. Like the HFC architecture, video controllers and data networking services are fed through a CMTS/edge router.

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Optical fibers are designed for many different application scenarios. To understand the different applications, it is important to understand the properties of different fiber types.

Two major types of optical fibers exist for communication system: multimode fiber and single mode fiber. The difference between them is that multimode fiber can carry many modes of light rays while single mode fiber can only carry one mode of light ray. This is a big difference. This fact determines that multimode fiber can only be used in short distance link, usually within a few hundred meters, while single mode fiber is used on much longer, usually 40~120km, distance. Based on this fact, it is now easier to understand that multimode fiber is used in LAN network and video surveillance while single mode fiber is used in long distance telephony applications.

Another consequence of this difference is the information carrying capability difference between these two types of fibers. Single mode fiber can carry hundreds times of more information than multimode fiber.

Now let’s examine the fiber types in detail.

Multimode fiber

Light ray travels in the fiber core at discrete angles within its acceptance cone. Multimode fiber has 50um or 62.5um diameter core, which is much larger than a 9um diameter single mode fiber core. Thus a large number of modes (light rays injected into the fiber at different angles) can be coupled into multimode fiber.

Now let’s look at two light rays that travel along a multimode fiber. One light ray travels straight down the fiber core center which is the shortest path. A second light ray travels at a steep angle and bounces back and forth by the fiber core side wall (a phenomenon called total internal reflection) while traveling down the fiber length which is a longer path than the first light ray.

Since the second light ray travels a longer path than the first light ray, they arrive at the fiber end at separate time (the second light arrives later than the first). This disparity between arrival times of the different light rays is called dispersion. The consequence of this disparity is a muddied signal at the receiving end. In order to properly receive the signal, the signal must run at a slower rate and that is why multimode fiber’s bandwidth is limited.

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