This matter must be from the just:
Many people will feel "fiber to the room to the room"It is a step in place, but for the family network, optical fiber is a real" IQ tax ".
Even some people have done stupid things from the weak electric box to fiber to each room during the decoration process.I cant use it in my life.
To figure out this matter, lets first talk about the brief history of fiber.
This is a plastic stick. When the laser pen is incorporated into the fiber at a certain angle, you will find that the laser is in a plastic stickFull reflection phenomenon inside will not be revealed from the outer wall of the plastic rod.At this time, the shot laser spread along the plastic rod.We can see the path of laser in the plastic rod.In a strict sense, this plastic stick is a "Multi-Mode Optical Fibre".
Many things become interesting once a lot of things are when they reach the micro.Episode demand, at this time, the electromagnetic shock of the fiber is perpendicular to the axis of the fiber.Light will shock in the fiber instead of reflection back and forth. This fiber is called "Single-Mode Optical Fiber".The color dispersion of optical fiber is essentially the best optical fiber transmission medium.However, due to the small diameter of the fiber and the demand for single-mode optical fiber, it is difficult to meet the energy requirements for LED light sources commonly used in multi-mode optical fiber.I -this caused the overall cost of the single -mode fiber system to be pulled up, pay attention!It is the overall cost of the system. The price of the single -mode fiber itself is cheaper than the multi -mode fiber.
Xiao Bai outside many industries often look forward to Wensheng, feel that "multi -mode" is "more" than "single -mode", and the price of multi It is believed that single -mode fiber is not as good as multi -mode fiber ... When you buy multi -mode fiber, you can buy a psychological superiority ...
Similarly, digital small white will feel that fiber fiber is worse than The copper cable network cable is more technological, so I feel that fiber equipment is more advanced than copper cable equipment, and the content of the article in front of the article appears "one step in place".In fact, the appearance of optical fibers in the field of communication is not because of its advanced technology, but because the optical cable is lighter than copper cables and has better passability. For long -distance pull -up line operatorsIn terms of infrastructure, the lightweight of infrastructure can save a lot of costs, so optical fiber began to become popular.Therefore, this thing is not a new technology.
Until the rise of high -speed networks, another feature of optical fiber is highlighted -the optical signal spread in fiber will not be affected by the signal in the external fiber.Copper -cable fiber disturbed by electromagnetic waves has no problem with lines.This gives fiber fiber a greater advantage in high -speed data communication.
The optical fiber has the advantage.Because of this high -density and high bandwidth transmission, most of them are concentrated inside the data machine room, and will not be decentralized to the field of home users who do not require high density because of this characteristics.
So, is there a high bandwidth demand for home use?In fact, there are also, most new computers are now equipped with lightning interfaces.
Lightning interface can basically provide users with a bandwidth of up to 40Gbps in the form of a daisy chain. In fact, this bandwidth is already equivalent to the optical fiber interface qspfThe bandwidth is full, and it is full of "40,000 megers."
But because we mentioned earlier, there will be no 40Gbps bandwidth at home, so these are used at home at homeThe thunderbolt interface line does not have the problem of skewers between lines.So it is not necessary to use optical fiber as a transmission medium.Still use the traditional copper quality.
There is only one line in the high -speed bandwidth link at home, which exists in fiber. This is the high -level HDMI cable.
The advantage of this is that the light signal transmitted in the fiber of the fiber is not affected by external bruises, but in fact, it is installed in the HDMI line.Instead of the transceiver, the cost of a HDMI cable will not be increased by the same transmission distance and transmission quality. The use of four optical fiber transmission signals is much cheaper than a variety of shielding layers with pure copper cables.
The advantages of the fiber after speaking, just like "choosing a girlfriends triangle", things often have advantages and there are disadvantages at the same time there are shortcomingsThere are advantages in various aspects that do not exist.
What are the disadvantages of optical fiber?
First of all, the photoelectric conversion element requires additional energy consumption, which will not be mentioned in many of the content of the optical bloggers.Lets look at the light module information on the device:
The voltage on the light module is 3.381 volts, and the current consumed by the transmission is to maintain the transmission.6 mAh, each optical module brings 20 mile of power consumption.Although 20 miles seem to be consumed large, a multi -mouth fiber switch often has 24 or even 48 optical modules.The power consumption of the optical module in the full fiber network of all ports of the full switch has become an extra energy consumption point that cannot be ignored.
This is just the transmitting power of the LED of the light module. Other devices of the light module also contain a considerable energy consumption. Basically1.5-2 watts.This can be seen from the heat of the optical module at work. For example, in the screenshot above, the temperature of the light module is basically maintained at 50 degrees all year round.
Energy consumption+heat also makes the temperature room of IN equipment much higher than other rooms:
Of course, there are many equipment at home, not only the light module is heating, but other equipment also works between equipment, but a large number of light modules are also a heating factor that cannot be ignored.
Second, the applicability of optical fiber is also an important issue.In the eyes of ordinary people, the fiber is the same, but the front of the article proposes the concept of optical fiber multi -mode and single -mode. Everyone may have a impression that "the fiber is not the same."complex.Fiber not only distinguishes single -mode and multi -mode, but even multi -mode optical fiber will divide different levels such as OM1 ~ OM5 according to performance, which is similar to the concepts of several types of lines of network cables.Therefore, the description of the SPF port in many network devices usually appears:
This means different fiber types
Take the OM (Optical Multimode) with multi-mode optical fiber as an example.There will be other development, especially when OM5 fiber
Theoretical bandwidth can not only reach 5000MHz, but also save 4 different wavelengths at the same timeThe optical signal is transmitted at the same time, and the development of technology is actually constantly challenging the limit. Therefore, if you can directly wear fiber when you do not make a fiber equipment, it may cause the upgrade of "future"In the end, I am afraid that the fiber equipment is "true", and the fiber must be changed again, resulting in the "cleverness" in the early stage.
Another more fatal problem is that the current home equipment has almost no interface for optical fiber.Whether it is your TV, game consoles, laptops, or most home routers, often do not have an interface with direct access to fiber.This is a problem with history.Most home network devices only have the Ethernet RJ45 interface.
This is because the ordinary 8P8C RJ45 interface is an open standard, which is an Electronic Industries Alliance (EIA) and the Telecommunications Industry Association(Telecommunical Industry Association (TIA).This standard specifies the physical dimensions, pin allocation and connection specifications of the socket and plug. The device using the RJ45 interface does not need to bear the authorization or patent cost.Especially after there is a network demand on TV, the RJ45 interface will be used.
But the optical fiber interfaces such as the SC, LC, FCs that many of us are familiar with are more complicated. In the strict senseCompanys patent.For example, the LC connection used by the light module we often mention
The patent of this thing is now in the hands of Kangpu. If a TV manufacturerThe device should pass the light signal with the LC interface, which is theoretically required to pay the authorization fee to Conopen.This has led to an increase in cost, so manufacturers of home equipment are not willing to do this.And if you have to do it, the optical fiber interfaces of household equipment will be used in accordance with the different cooperative relationship between the manufacturer and the patent owner, and the fiber interface of the household equipment will not be used at all.
In terms of the level of optical modules upstream of optical fiber, although the SFP standard is an open standard for the Fiber Alliance -similarThe light cage
If there is no SFP light cage, the use of fiber at home involves optical fiber network cards or fiber transceivers.
The optical fiber network card can be used on desktop or some NAS with PCIE extensions, but for ordinary home appliance levels, such as TVThe game console and projector are completely impossible to install, and the fiber transceiver must be introduced here.
This device is a small box that converts the fiber signal into a copper cable signal.In fact, there is not much processing ability, and it also exists as an emergency plan in engineering.It costs a lot of effort and high cost. It will eventually get full fiber. In the end, this small box will pull the network performance to before liberation, which is a kind of investment behavior that is not worth it.
Therefore, if you are not just needed at home, you just feel that the fiber is more advanced than the copper cable.In fact, a large IQ tax has been paid.
As for, buying fiber optic fiber in advance can only be regarded as self -made.When you really want to use optical fiber, it is also a matter of more than ten years or even more than ten years. At that time, the specifications and interfaces of the fiber may have changed tremendous.Unknown number.
