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What is the difference between digital signal and analog signal?

  Many people doesn't know the different between anolog signal and digital signal,actually the two signal has the same transmission way.Only different is analog signal  transmission continuous and digital signal transmission intermittent.The main purpose to the name of digital signal is difference from the analog signal.Not somebody thinks it become digital power supply 0102.Just like anolog's power supply and digital's power supply,digital power supply can power generation rely on 0102 digital module. 

  The different between analog signal and digital signal:Analog signal and digital signal has different data that must be convert to relevant signal to transmission;Analog data general adapt analog signal,For example,It's expression with serial of changed electromagnetic wave (such as wireless electronic and TV broadcast's  electromagnetic wave) or voltage signal(for example,audio voltage signal in phone call transmission);Digital data adapted digital signal,such as a serials of  intermittent changed voltage pluse or optical pluse to expression. When analog signal adapted coutinuous changed electromagnetic wave to expression,it's though traditional analog signal transmited route( such as phone network、wired TV network).When digital adapted intermittent changed voltage or optical pluse to express,It always need twaisted-pair cable、electronic cable or optical cable to connected both side to transmit one point to another point  
      Digital communication has blow advantage:(1)Enhance communication security. Vioce signal via A/D changed original to anolog signal.(2)It improved anti-interference capacity,expecially in relaying,digital signal can regeneration and eiminate noise overlop.(3)Can control the mistake in transmission that improve the quality of transmit.(4) It's convenient to use moden digital signal technology to deal with digital massage.(5) It construct comprehensive digital communication network,comprehensive transmit kinds of massage to enhance the system's communication function.But the digit communication also exsition disadvantage,For example:accupation widly  frequncy brand,the requirement of technology is complex,With quantitative error when converting module/data. 
What is the fiber optical transceiver theory

A Brief Introduction of Fiber Optic Transceiver


As an essential part in the whole optic communication system, fiber optic transceiver is a device that transforms electrical signal into optical signals so that the information could transmit in the optical fiber. Once getting to the destination, the transceiver then transforms optical signals into electrical signal. Since it is a conversion device, transceiver must be put on the corresponding equipment so that it can be used.

How Does A Fiber Optic Transceiver Work?

Fiber optic transceiver is an optoelectronic device made up of functional circuit and optical interface, aiming at transforming electrical signals into optical signals. It is used for transforming signals between the switches and devices. The optoelectronic functional circuit includes two parts: the transmitter and the receiver. First the transmitter converts the electrical signals into optical signals and transforms the signals to the receiver, usually through the optical fiber cable. The transmitting part is responsible for inputting a certain rate of electrical signals by internal driver chip to drive the semiconductor laser or LED (light emitting diode) to emit the corresponding rate of optical signal modulation. Inside the transceiver, there is an automatic control circuit, which could ensure a stable optical signal power. The receiving part is in charge of inputting a certain rate of optical signals and then transforming it into electrical signals by LD (laser diodes), at last outputting the corresponding electrical signals through the preamplifier.

working principle


According to different standards, fiber optic transceiver can be divided into different kinds. In general, it can be classified by its package, transmission rate, and function (with or without hot pluggable). Among them,  the most common classification is the first one, by its package.

According to Different Packages: GBIC, SFP, XFP, Xenpak, X2 and so on
  • GBIC transceiver module: Gigabit Bitrate Interface Convert, a hot pluggable device, has been widely used before the SFP was developed. But now it is nearly knocked out besides being used on some outdated facilities.
  • SFP transceiver module: Short for Small Form-factor Pluggable, it is an enhanced version of early GBIC, but smaller size than GBIC. The common optic module is often referred to as this one.
  • XFP transceiver module: 10 Gigabit Small Form-factor Pluggable, It is used on 10Gbps SONET / SDH, Fibre Channel, 10 Gigabit Ethernet. XFP has a higher transmission rate and transmitting capacity, but also a higher price than common transceiver modules.
  • XENPAK transceiver module: With a 10.3G working rate and a XAUI interface, XENPAK is a hot-pluggable device which is compliance with XENPAK MSA protocol and it can meet the demand of 10 Gigabit Ethernet (10GbE) standard.
  • X2 transceiver module: A hot pluggable in the Z-direction module that is usable in typical router line card applications, Storage, IP network and LAN (Local Area Network) and compliant to XENPAK MSA. It is designed for 10Gbps applications.
According to Different Transmission Rates:
  • 100Base transceiver module: transmission rate 155 Mb/s
  • 1000Base transceiver module: transmission rate 1.25 Gb/s
  • 2.5G transceiver module: transmission rate 2.5 Gb/s
  • 4.25G transceiver module: transmission rate 4.25 Gb/s
  • 6G transceiver module: transmission rate 6 Gb/s
  • 8.5G transceiver module: transmission rate 8.5 Gb/s
  • 10G transceiver module: transmission rate 10 Gb/s
  • 40G transceiver module: transmission rate 40 Gb/s
  • 100G transceiver module: transmission rate 100 Gb/s
Function (with or without hot pluggable):

Fiber optic transceivers can fall into two categories: hot pluggable transceivers and non pluggable transceivers. The former one means the users don’t need to shut down the system or cut off the power if they want to replace the damaged parts, so that it could improve recovery ability and flexibility of the system. While non pluggable device could cause permanent damage if it is forced to take out. Fiber optic transceivers has two kinds in this classification: hot pluggable and non pluggable. The latter is much more popular among users.

In conclusion, without a fiber optic transceiver, the whole optical communication system could not orderly operated. It is a device used to send and receive information, including two parts: a transmitter and a receiver. It has two ends, one that an optical cable plugs into and another for connecting an electrical device. According to its different packages, different transmission rate, hot pluggable or non pluggable, we can fall them into different categories.

If you are looking for a fiber optic transceiver, Fiberstore is a good choice. There are a number of different types of fiber optic transceivers available, which are used for a variety of applications both in home and industrial fields. They differ in the types as well as in the quality of data transmission and the speed may change from device to device. Go and search your targeted transceiver in Fiberstore!

How fibre optic transmitter works

 Fibre optic transmitter 
Businesses of various aspects to any fiber optic transmitter. For just about any application, the various specifications need to be examined to make sure that the particular fibre optic transmitter will meet what’s needed.
One of the major aspects to any fiber optic transmitter, is its power level. There’s no question that the fiber optic transmitter must have a sufficiently high level of sunshine output for the light to be transmitted across the fiber optic cable towards the far end. Some fibre optic cable lengths many simply be several metres or many metres long, whereas others may extend for many kilometres. In the case of the long lengths, the strength of the fiber optic transmitter is of great importance.
The kind of light produced can also be important. Light could be split up into two classes, namely coherent and incoherent light. Essentially, coherent light includes a single frequency, whereas incoherent light contains a wide selection of light packets all containing different frequencies, i.e. there is no single frequency present. Although some emitters may appear to emit just one colour, they can be incoherent since the light output is centred around a given frequency or wavelength.
The regularity or wavelength from the light may also be important. Often fibre optic systems will operate around a given wavelength. Often the wavelength of operation is given.
It is also necessary to consider the rate where the transmitter can be modulated because this affects the data rate for that overall transmission. Sometimes low rate systems may only need to carry data for a price of some Mbps, whereas main telecommunications links have to transmit data at many Gbps.

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