Tag Archives: fiber optic transmission

Fiber Optics is the Ideal Way in Today’s and Future’s Application

As we see, fiber optic transmission has already been the efficient way to transmit a wireless signal and RF signal. Compared to coaxial cable, fiber optic cables has the advantages such as lower signal loss and lower weight, except this, it is also cheaper than coaxial cable. Only by these reasons, fiber optics play an important role in wireless networks. Next we will introduce several fiber optic product in different application for you.

Fiber Optic Transmitter and Receiver

The function of fiber optic transmitter, optical transmitter with AWG see at the figure, is transmitting the RF signal into an optical signal in 1.3μm, the input impedance of the fiber optic transmitter is 50Ω and the output is an optical signal whose brightness is synchronized with the RF voltage. An optical detector internal to the laser transmitter is used to monitor the output power and adjust the bias current of the laser to maintain a constant average optical output. It maintains the consistency in performance, the best linearity and the longest life of the system.

optical transmitter with AGC

Fiber optic receiver use a high speed detector and for transmitting the optical signal to RF signal. It is usually used with fiber optic transmitter. Low noise linear gain stages boost the signal back up to the desired RF level. Our Fiberstore‘s all fiber optic receivers overtake consistent tests and keep stable and long-term performances.

Fiber Optic Cables and Fiber Optic Connectors

Well, based on the special characteristic of RF in fiber optic applications, single mode fiber cable is the choice for it. The fiber has a core and cladding size of 9/125μm, and the fiber optic connector mainly for the stability and coupling of the light. But in the RF/fiber optic system, angle polished connectors are used more often, such as APC, UPC. Due to them, they can reduce the optical reflections at the connector. At the same time, we need to know that reflection in the system can cause increased noise, dirt and so on, then the connector will cause higher connector loss but also reflections. So the connector need to keep clean, the right way to keep clean is that using 99% alcohol and lint free wipes, always replace the cap on the ferrule when the connector is not in use.

Applications

In Building public safety, Fiberstore’s technology and Bidi fiber optic transceiver deliver the signal across the fiber optic network for in-building signal distribution. The benefits of fiber optics are endless. Fiberstore’s modular devices transmit RF signal in fiber easily and they keep distortion-free communications in the building of emergency, fire and police radio RF systems. Facing with the system capacity and improving the reliability of the network. Fiberstore is toward the direction of lower telecommunication cost, safe and reliable for users.

In military aspect, Today’s global battlefields are sophisticated networks of Army, Navy, Coast Guard and Air Force defense organizations requiring robust, they need monitoring and tracking, as well as high quality voice, video and data communications, as for this requirements, Fiberstore RF solution unmatched performance for radio frequency transport applications ranging from low frequency through VHF, UHF to satellite-band transmissions. Fiber optic cables provide the highest performances for soldier’s safety in military applications. The figure shows the special connector that can be used in the military application. We are very strict with the design and quality of fiber optic connector.

fiber optic connector

With the developments of the Internet, wireless LAN technology and protocols such as IEEE 802.11, Fiberstore;s fiber optic transceiver technology provides flexibility in architecture design, extended radio frequency coverage and enhanced performance in the wireless spectrum, and provide higher ability for wireless users. Fiberstore is doing his best for faster and more reliable communications solutions.

Synchronous Optical Networking Introduction

Synchronous Optical Networking is usually called SONET for short. The SONET standards were coded in the mid-1980s to consider benefit of low-cost fiber optic transmission. It defines a hierarchy of data rates, formats for framing and multiplexing the payload data, as well as optical signal specifications (wavelength and dispersion), allowing multi-vendor interoperability.

SONET may also be referred to as “T-1 on steroids”. Can you explain that? As you may know, the digital hierarchy (DS-0, DS-1, DS-2, DS-3 and much more) was created to provide cost-effective multiplexed transport for voice and data traffic from one location inside a network to a separate.

SONET and SDH (Synchronous Digital Hierarchy) are two equivalent multiplexing protocols for transferring multiple digital bit streams using lasers or LEDs (light-emitting diodes) over the same optical fiber. They were made to replace PDH (Plesiochronous Digital Hierarchy) system to get rid of the synchronization issues that PDH Multiplexer had. SONET is synchronous, which means that each connection achieves a continuing bit rate and delay. For example, SDH or SONET might be utilized to allow several Internet Service Providers to talk about exactly the same optical fiber, without being affected by each others traffic load, and without having to be able to temporarily borrow released capacity from one another. SONET and SDH are considered to become physical layer protocols since they offer permanent connections and do not involve packet mode communication. Only certain integer multiples of 64kbits/s are possible bit rates.

SONET is really TDM(time division multiplexing) based and this causes it to be readily supported fixed-rate services such as telephony. Its synchronous nature is designed to accept traffic at fixed multiples of the basic rate (64kbit/s), without requiring variable stuff bits or complex rate adaptation.

The SONET data transmission format is based on a 125us frame composed of 810 octets, of which 36 are overhead and 774 are payload data. The fundamental SONET signal, whose electrical and optical versions are referred to as STS-1 and OC-1, respectively, is thus a 51.84Mb/s data streams that readily accommodate TDM channels in multiples of 8 kb/s.

It is important in fiber optic network that SONET can be used to encapsulate PDH and other earlier digital transmission standards. It is also used directly to support either an ATM (Asynchronous Transfer Mode) or packet over SONET/SDH (POS) networking. So SONET/SDH is actually a generic all-purpose transport container for moving both voice and knowledge traffic. They in themselves aren’t communications protocols.

SONET brings by using it a subset of benefits that make it differentiate themselves from competitive technologies. These include mid-span meet, improved operations, administration, maintenance, and provisioning (OAM&P), support for multipoint circuit configurations, non-intrusive facility monitoring, and the capability to deploy a variety of new releases.

Improved OAM&P is among the greatest contributions that SONET brings to the networking field. Element and network monitoring, management, and maintenance has always been something of the catch-as-catch-can effort due to the complexity and diversity of elements inside a typical service provider’s network. SONET overhead includes error-checking ability, bytes for network survivability, and a diverse set of clearly defined management messages.

China Optical Fiber To The Home will Release 8 Trillion Business Opportunities

From global telecommunications network investment development in the last five years, China has become a leading global network equipment, which is one of the main kinetic energy market growth. As the optical FTTH(fiber to the home) FTTH patch cables policy, RMB 600 billion forecast will bring business opportunities, in addition to the infrastructure construction, the Chinese are optimistic forecasts for the whole broadband policy related investment on the upstream and downstream industry more than 1.6 million yuan. In addition to broadband policy, China to accelerate the development of 4 g, driven optical fiber and CNC equipment performance grow.

Housing and urban-rural development, according to media reports, China’s ministry of industry and information technology, has issued “residential area and residential buildings fiber-to-the-home fiber optic transmission facilities engineering design specification”, “residential area and residential buildings fiber-to-the-home fiber optic transmission facilities engineering construction and acceptance norms”, the two national standards, to the situation of the implementation of the optical fiber to the home for the first time to make mandatory provisions.

According to the rules, from April 1, in public telecommunication network is optical fiber transmission. New residential and residential construction of communications facilities, should use optical fiber to the home way construction, at the same time, encourage and support the conditional towns, rural housing project.

According to internet service providers, if you want to complete “250 million broadband users, access speed urban family an average of more than 20 m rural averaged more than 4 m in 2015,”, individual operators, the total cost of the national broadband network construction, will need about 200 billion yuan to 280 billion yuan, the three operators will exceed 600 billion yuan total construction cost.

China ministry of industry and in the “broadband China 2013″ conference earlier this year has also suggested to add FTTH (fiber to the home) covering number exceeds 35 million goals. Ministry of industry and at the same time, according to the last year China FTTH coverage expanded to 94 million households.

Hainan New Housing Will be Installed Fiber To The Home,Users Can Customize Operators

On16, we learned information from housing and construction department of Hainan province, to implement the national ministries to speed up the popularization fiber-to-the-home FTTH fiber optic cables broadband China construction requirements, to promote residential and residential building in the construction of optical fiber to the home, new housing will be comprehensive implement the optical fiber to the home work of Hainan province.

According to the state ministries issued “residential area and residential buildings fiber-to-the-home fiber optic transmission facilities engineering design code” and “residential area and residential buildings fiber-to-the-home communication facilities engineering construction and acceptance standard” requirements: in public telecommunication network is optical fiber transmission at county level and above, the new residential and residential construction mode of communication facilities should use optical fiber to the home construction;

Engineering design must have several equal accesses, user can choose telecommunication business operators. Newly built residential area and residential buildings of underground communication pipe, distribution pipe network, telecommunications, equipment and other communication facilities must be synchronous with residential area and residential buildings construction, synchronous acceptance.

According to introduction, in various cities and counties of Hainan province related departments to strengthen supervision, to solve the optical fiber to the home renovation entry difficult problem. At the same time, encourage and support the conditional villages and towns, rural housing project and residential construction to realize optical fiber to the home. Residential construction unit, realty service enterprise should actively support optical fiber to the home renovation, shall not be restricted telecom operating companies equal access and use, shall not restrict the user options.

Japan Launched Highest Speed 2Gbps Fiber Optic Network, Faster Than Google Fiber

Japanese communication fiber optic network company So – net announced yesterday that they have introduced the world’s highest speed fiber optic networks “NURO optic”, as “one of the world’s fastest” personal commercial fiber-to-the-home cable service, faster than Google Fiber. Its the biggest 2 GBPS download speed, upload speed is 1 GBPS, and supports a maximum speed of 450 MBPS wireless base stations.

To deal with “NURO optic” now is to sign up for two years, monthly 4980 yen, at the same time you need to pay 840 yen fees and 31500 yen for installation cost. But “NURO optic” service has not been extended to all of cities in Japan, only open the Tokyo and the Kanto and other four cities.

So-Net was established in 1995 in November, and in the next year began to provide  fiber optic network services. In 2001, So-Net began to arrive in Taiwan. So-Net Hong Kong is in 2001 to provide broadband Internet access services and with the SONY brand and premium strategy called preemption already saturated cable management Internet users.

In May 2002, cooperate in central Tokyo electric power, electric power company, started to provide fiber-optic Internet service. (In early August last year, SONY announced that it plan to spend 60 billion yen ($764 million) to buy a 42% stake, the rest of the implementation of the company’s sole holding. SONY plans to use the So-Net to enhance Japan and the Asian companies and interactive entertainment experience, and hopes to provide new web fiber optic transmission services project.).