Small package for optical transceiver or into a new generation of trend

Communication network transmission capacity and expanding rate along with the increase of modern information network of optical fiber communication becomes the main transmission means, now in the optical communication network, such as a wide area network ( WAN ), metropolitan area networks ( MAN ), local area network ( LAN ) needed as one of core of optoelectronic devices and optical transceiver optical transceiver module more and more types, are increasingly high requirements, complexity is developing at an amazing speed. Optical transceiver, the optical transceiver module sharp increases in the diversity, needs to continue to develop related technology that satisfies the application requirements. The optical transceiver development direction may be moving towards miniaturization. The optical transceiver optical transceiver module for optical fiber access network core devices promote the trunk optical transmission system to low cost development, makes the optical network configuration is more complete and reasonable. In order to adapt to the requirements of communication equipment for optical device, optical module is highly integrated small package development. Highly integrated photovoltaic module the user without having to deal with high speed analog signal, shorten the R & D and production cycle, reduce the vitality of types of procurement, reduce production costs, therefore also more and more receives equipment manufacturer's favor. The optical transceiver transceiver module of photoelectric device encapsulated by the larger size of the dual-in-line forms for the development of coaxial package forms; optical interface structure from ST, FC to SC and the smaller LC, MT-RJ type connection form, a corresponding optical transceiver optical transceiver module packaging form from the metal packaging development into the plastic package, consisting of a single interface separation module developed to interface transceiver module. Pin arrangement and encapsulated by a dual-in-line 20 foot, 16 foot separation module to the development of the single row 9 feet ( 1X9 ), two 9 foot ( 2X9 ) and the future of double rows of 10 foot and 20 double foot transceiver module. SFF ( Small Form. Factor ) small packaged optical module adopts the advanced precision optics and integrated circuit technology, dimensions of only ordinary duplex SC ( 1X9 ) type optical fiber transceiver module half, in the same space can be doubled optical port number, can increase the line port density, reduce the system cost per port. Because the SFF small package module adopts a similar MT-RJ interface with the copper network, size and common computer network wire interface, is conducive to the existing copper network device to transition to a higher rate of optical fiber network to meet the rapid growth of network bandwidth requirements. Small package for optical transceiver optical transceiver module to the appearance of small package size advantage, so that the network device interface of the optical fiber number doubled, single port rate Gigabit magnitude, to meet the INTERNET era of network bandwidth demand rapid growth. Can say small package for optical transceiver optical transceiver module technology represents a new generation optical communication device development trend, is the next generation high speed network foundation.

Optical fiber amplifier in optical wireless communication applications

Introduction Wireless optical communication with laser as the information carrier, is a not need any cable channel as a communication method. Compared with the microwave communication, wireless optical communication by use of laser high frequency, strong directivity ( confidentiality ), the available spectrum is wide, without the need to apply frequency license; compare with optical communication, optical wireless communication has the advantages of low cost, simple construction, fast. It combines the advantages of microwave communication and optical fiber communication, has become a new broadband wireless access way, got the wide attention of people. However, severe weather conditions, for wireless optical communication system spread signals generated attenuation effect. The air of the scattering particles, can make the light in space, time and angle to produce different degrees of deviation. Atmospheric particles may also absorb the laser energy, so that the signal power decrease in wireless optical communication system, optical fiber communication system of low loss propagation path has ceased to exist. Atmospheric environment changeful objectivity cannot change, to get better and faster transmission effect, in the atmospheric channel transmits optical signals to put forward higher requirements, in general, the power of the light signal can be obtained better transmission effect. With the development of optical fiber amplifier ( EDFA ) is developing rapidly, stable and reliable power source in various applications to meet the requirements of wireless optical communication. 1 EDFA principle and structure Erbium doped fiber amplifier ( EDFA ) has high gain, low noise, wide frequency band, high output power, low loss and polarization insensitive connection etc., directly on the optical signal is amplified, without the need for conversion into an electrical signal, can ensure the optical signal in the case of stable minimum distortion power amplifier. 1.1 EDFA principle In erbium doped fiber pumped enough strong pump, can be most in the ground state Er3+ ion pumping to the excited state, in the excited states of the Er3+ ion and rapidly without radiation transfer to a metastable state. As a result of Er3+ ions in a metastable state, longer service life, thus easily in a metastable state and the ground state is formed between the particle number inversion. When the signal photons through the erbium doped fiber, and is in a metastable state Er3+ ion interactions occur stimulated radiation effect, produce a large number of their identical photons, then through the erbium-doped optical fiber transmission of signal photons increases rapidly, generating signal amplifying function. Er3+ ion in a metastable state, in addition to the occurrence of stimulated emission and stimulated absorption, but also produce spontaneous radiation ( ASE ), it caused the noise of EDFA. 1.2 EDFA structure A typical EDFA structure mainly comprises an erbium-doped fiber ( EDF ), a pumping light source, coupler, isolator. Erbium doped fiber is the core part of the EDFA. It is quartz optical fiber as matrix, mixing in the core of solid laser material of erbium ions, in a few meters to tens of meters of erbium doped fiber, the interaction of light and matter is amplified, enhancement. The optical isolator is the role of inhibition of light reflection, to ensure that the amplifier stable work, it must be a low insertion loss, polarization independent, isolated over 40 dB of. 1.3 EDFA characteristics and performance index Gain characteristics of said amplifier, which is defined as the ratio of the output power and input power: Type : Pout, Pin denote respectively the amplifier output and the input end of the continuous signal power. Gain coefficient is defined from the pump light source input 1 mW pump power through the fiber amplifier to obtain the gain, the unit is dB / mW: Type: G0 is composed of pump intensity of small signal gain coefficient, as a result of gain saturation phenomenon, with increasing signal power, gain coefficient decreased; Is, Ps respectively for the saturation intensity and saturation power, is to show that the gain of material properties, and the doping coefficient, fluorescence time and transition section for. The gain and the gain coefficient of difference: the gain is mainly directed against the input signal, and the gain coefficient is mainly directed against the input pump character. In addition, gain and pumping conditions ( including the power of pump and pump wavelength), the primary pump wavelength was 980 nm and 1480 nm. Because of all the gain factor is different, and the gain must be in the whole fiber integral is obtained, so the characteristics can be used to by selection of the fiber length is relatively flat gain spectrum. 1.4 EDFA bandwidth The gain bandwidth of signal light obtained certain gain amplification wavelength region. In fact EDFA gain frequency change ratio theory is much more complicated, and also the matrix fiber and its doping related. In the EDFA gain spectrum width has reached hundreds of nanometers and gain spectrum is relatively flat. ED-FA gain spectrum in the range of 1525～1565 nm.

The typical application of HyHPY analysis

Nowadays, network traffic growth of 99% from packet flow, namely the Ethernet packet data, instead of voice traffic. From the development trend of the future can see inside, the near future will be from the mobile phone more 3G data, and video traffic, these data flow will make the SDH now such a network was too busy to attend to all. Therefore, domestic and foreign telecom operators are active deployment optimization IP network, and the need for new technology that can be transformed into existing networks based on OTN metropolitan area network infrastructure. Figure 1 shows, these new equipment including: WDM or ROADM device, frame type OTP and a OTP (µ -OTP ). In the global market of optical transmission equipment, mainly OTP/ROADM model of optical transmission equipment demand expands ceaselessly, is gradually replacing the SDH equipment. ( Figure 2) Figure 2: optical transmission equipment revenue PMC-Sierra HyPHY series is derived from HyPHY 20G and HyPHY 10G were associated together, in order to apply micro OTP, any OTP service, rate and port line card and ROADM single chip multi service converged type wavelength converter ( Muxponder ) and ( Transponder ) transmitting transponder. The only difference between product capacity, data and other features are exactly the same. Original equipment manufacturer based on HyPHY series ROADM, OTP and OTP miniature (µ -OTP ) equipment. Not only can satisfy the technical requirement of telecom operators, but also can significantly reduce the operating and capital expenditure. Figure 3: applicable to any business, rate, port multiple business focusing type wavelength converter ( Muxponder ) Multi service converged type wavelength converter ( Muxponder ), is used in WDM or ROADM equipment, need to reduce power consumption and BOM based on cost, satisfy any service, port Muxponder or MSPP-on-l card needs. While the HyPHY 10G/20G for discrete solution, single chip solution can be BOM cost and power consumption reduced by over 50%, to its paired cards ( Mated Card ) between the protection function can be supported in SONET or OTN flow; also can be directly connected to the adjustable WDM ready to XFP or MSA module; the last packet interface, can be for the L2 business to provide optional support. Figure 4: applicable to general transmission responder ( Transponder ) Universal transmission responder ( Transponder ) is used in WDM or in ROADM equipment, this is the HyPHY second applications, 10G traffic input and output flow can be used in 10G, SDH or OTN network. HyPHY 10G can not only make the Transponder power and BOM cost reduced by over 50%, and in Muxponder applications, pairing between the card protection function can be supported in SONET or OTN flow, and can be directly connected to the adjustable WDM ready to XFP or MSA module. In addition, but also with HyPHY 20G 100% PIN and software compatibility. Figure 5 : application to multiple line card OTP Line card application is the most prevalent, system side is some cross plate, and the line side SFP can support different ports, to support different business, such as Ethernet, fibre channel and so on. HyHPY 20G as a single chip solution, can effectively reduce power consumption and BOM cost, and satisfies the high density of any service, port line card needs. In addition, HyHPY 20G SONET/SDH and ODUk support leading function and ODTUk multiplexing function; has the incomparable flexibility, the flow is mapped to the STS-ns or ODU-ks; also has a OTN system interface which can be connected to the OTN, SONET/SDH and can realize the packet structure. Fig 6 applicable to miniature OTP (µ -OTP ) For HyPHY products, especially HyPHY10G chip, through the optimization of the equipment has become very small, while reducing the power consumption, power micro OTP to miniaturization and lower power direction. HyPHY10G supports the industry characteristics of the most abundant, is applied to the OTN or SDH network is a small OTP platform, and with on-chip SONET/SDH and ODUk communication function and ODTUk multiplexing function. Global telecom operators compete to build IP of optimized OTN network must address access integration problems, OTN can replace SONET/SDH. PMC-Sierra HyPHY series OTN support bearing multiple business integration, packet structure bearing the OTN exchange and meet OTP and ROADM requirements standard line card, a comprehensive solution to access integration problems. PMC-Sierra enables OTN to realize end to end instead of SONET/SDH.

How to Create a Decorated Baby Nursery

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Set your budget for creating the baby nursery. Break down the expenses among furniture, decor, renovations, bedding and storage containers. Use the prepared budget to decide which pieces to buy for the room.
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Toshiba C3000 Performance wise above can be said that first-class performance, resolution of a 1920  1080, absolute high definition picture quality. The most valuable is equipped with Toshiba's new high-definition image processing chip MetaBrainpro. The chip assembly as many as six of the image processing system, including the Night Elf - Dark field automatically adjusts the backlight system; 3D color management system; natural edge optimization system; Digital Dynamic oblique direction correction system; full digital image processing system; brightness / Contrast Dynamic Optimization System; 3D digital comb filter / noise reduction entire digital tracking system. All of these features are the use of a high-end imaging technology, superior picture perfect.
Brainstorm themes, colors and general design styles for the nursery. Choose the combination that best fits your personality and the rest of the home, while keeping a child-like feeling to it. Use the chosen concepts to plan all of the nursery elements.
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Paint the walls of the nursery in a color that complements the selected theme and decorating style. Use a low- or no-volatile organic compounds, or VOC, paint for the healthiest option. Regular paint contains toxins that continue to release into the air long after the paint dries.
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Measure the nursery as a guide for planning the layout. Draw a floor plan of the room with the dimensions, including windows, doors, closets and other structures in the room. Sketch in each of the pieces of furniture for the nursery.
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The Feast of the Assumption In the early Christian centuries relics  of saints and those who gave their lives for the faith were jealously guarded and highly prized. Many cities claim the mortal remains of saints, both famous and little-known. But there are no records of Mary's bodily remains being venerated  anywhere.

In the Celtic lands, mid August was harvest time. The festival of Lughnasa was the harvest celebration in honor of  the God of the harvest Lugh who was responsible for the bounties of the harvest. There was singing and drinking and dancing and story telling in gratitude for the harvest and the promise of food to eat during the winter months. In Christian times it became the festival of Mary at Harvest Time because Mary reflected the life giving, life nurturing love of God.

As the Feast of the Immaculate Conception  proclaims the grace of Christ in Mary before he was born, so the Feast of the Assumption points to the fulfillment of that grace, when Mary was taken, body and soul, into heaven to share in the glory of her Son's Resurrection .

Like the mystery of her Immaculate Conception, the Assumption of Mary is significant for all humanity, since she anticipates our resurrection with Christ in glory.

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The Opladener Bierborse goes back to 1987, i.e. 177 years later, when Herbert Sondermann, a native of Opladen, had the idea of introducing a beer event and put this into effect in the form of a small event with seven beer stands in the pedestrian precinct in Opladen. At that time as well, nobody anticipated what a wonderful event was to develop from these beginnings. Today, Herbert Sondermann wears the Bundesverdienstkreuz (Order of Merit) of the Federal Republic of Germany for his services to Opladen; because the small beer event in the pedestrian precinct in Opladen has now become the largest open-air event in the history of the city of Leverkusen and the largest event of this kind anywhere in the world.
Bierborse
Only the large number of beer types from all over the world allow the visitors to sample even unusual varieties.

In more than ten years of development work, the Bierborse has been developed, according to stringent rules and numerous selection criteria, into one of the most successful German public festivals without any blending with other types of event such as funfairs or even junk markets. This also illustrates how it differs from the Munchener Oktoberfest.

Only the large number of beer types from all over the world allow the visitors to sample even unusual varieties. These include, for example, San Miguel from Spain, Efes from Turkey or Corona from Mexico which revive memories of past holiday trips.

The small house breweries whose beers are not often offered on draught outside their brewing locations are also regular guests at the BIERBORSE events. The range on offer is rounded off by the well-known German brands which form the foundation of the Bierborse. This is presented in a cosy beer-garden atmosphere.

How long does it take to forget

Last night, I chatted with my friend who was crossed in love 3 months ago. She said:" it may take only a blink to fall in love with a man, but it takes a whole lifetime to forget the one you have ever loved." I think her words over carefully and agree with her opinion. The first love is the most memorable. To tell you the truth, I can't forget the boy I was in love at high school. Sigh, he had already forgotten my name, I guess. Maybe, we women are not as callous as men. Men are easy to fall in love and also easy to forget love. Usually, women feel emothionally attached to the men they loved first. I don't want to trap in the past. I want to move on but I fail. Can anyone tell me how long it takes to forget first love? Is there a good way to forget the past?
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