USB fiber optic transceiver: the first choice for fiber-to-the-home terminals

Fiber to the home, referred to as FTTH (Fiber To The Home), is a fiber optic cable from the telecommunications company to the user's home. The fiber optic cable reaching the home does not mean that the fiber optic cable reaches the user's terminal (computer). The user's terminal (computer) needs to be connected to a fiber optic transceiver to be truly "fiber to the home" - "fiber to the user", or "fiber to the desktop". FTTH can achieve a bandwidth of 10M/100M or even 1000M.

　　Figure 1 Appearance of USB fiber optic transceiver on laptop keyboard

　　Traditional fiber optic transceivers are connected to Ethernet ports, that is, RJ-45 ports. Most of them are large iron shells and must be powered by an external power supply. Most users do not like to put such fiber optic transceivers on the desktop. Boshi USB fiber optic transceiver directly converts a pair of fiber optic transceiver heads from USB for remote transmission. No external power supply is required. It is the smallest fiber optic transceiver in the industry and supports both single-mode and multi-mode optical fibers. The optical port is 100Base-FX that complies with the IEEE802.3u Ethernet standard, which is the standard for 100M/10M Ethernet optical fiber signals. Therefore, it can directly communicate with other standard Ethernet optical fiber transceivers. Boshi USB fiber optic transceiver not only changes the traditional RJ-45 port to a USB port, but also subverts the size and appearance of traditional Ethernet optical fiber transceivers, abandons the traditional large iron box appearance, and creates a technology that can transmit in both single-mode and multi-mode optical fibers. The feature of not requiring power makes USB fiber optic transceiver the first choice for terminal devices such as notebooks, tablets, and smart phones to connect to Ethernet fiber, and it is also the first choice for fiber-to-the-home! The product has an ultra-small appearance (74*23*47mm), realizes fiber optic transmission that complies with Ethernet standards, and only requires the installation of drivers without modifying existing software. OPET110U is a dual-fiber version that can be used in pairs or communicate with other Ethernet optical ports that comply with the 100Base-TX standard. OPET110U1 is a single-fiber transceiver that uses only one optical fiber for transmission and reception and is used in pairs. Because optical fiber is used as the communication transmission medium, it has the advantages of isolating high voltage, preventing electromagnetic interference, and long transmission distance.

　　Figure 2 Optical port communication status indicator and electrical port (USB) socket

　　Although the USB fiber optic transceiver is much smaller in size, its functions are not reduced, and it also adds unique single-mode and multi-mode universal technology. As shown in Figure 2, it has a USB port, power indicator light, optical port indicator light, electrical port indicator light, and 10M/100M indicator light.

　　Since all the intermediate links are optical fibers, fiber to the home (FTTH) greatly increases the bandwidth. Advantages of FTTH: 1. FTTH has the advantage of high bandwidth and can meet the needs of home ITV, video surveillance, calls, environmental monitoring and other aspects. With optical cables indoors, there is no need to lay telephone lines and cable TV lines in the future! 2. With FTTH at home, the Internet bandwidth can reach the maximum, which can guarantee 10M, 100M or even 1000M. 3. The network is stable. Due to the characteristics of low optical transmission attenuation and anti-electromagnetic interference, the FTTH network has better stability and more stable upload and download rates. The charm of fiber to the home lies in its huge bandwidth. It is the best solution to solve the bottleneck phenomenon of the "last mile" from the Internet backbone to the user's desktop.

　　Typical application: Terminal computer A is connected to the USB port of the USB fiber optic transceiver via a USB cable; device B is a fiber-to-the-home optical port (100Base-FX standard), which is connected to the fiber optic interface of the USB fiber optic transceiver via two optical fibers to achieve fiber optic to the user's desktop.

　　Figure 3 Wiring diagram of USB fiber optic transceiver

　　Today's fiber-to-the-home technology is no longer just in the laboratory. Please see the preferential measures launched by a local telecommunications company in 2012: 1. Telecom users in eligible areas can switch to fiber access for free, and receive an additional 20 yuan in phone bills. 2. Broadband users can also enjoy 3 months of 8M bandwidth experience for free. Obviously, 8M means that the current fiber-to-the-home signal has only reached but not exceeded the maximum rate limit of ADSL, and there is still a lot of room for development of FTTH in the future. Since 2011, new residential communities and new villages in new rural construction in a certain city will adopt FTTH access technology. At present, some communities have taken the lead in using FTTH access. The application of this technology will provide a good network platform for the development of broadband services such as IPTV. The fiber-to-the-home installer will pull a fiber from the outside to your home, and then give you a device called an optical modem (ONU). The installation method of the optical modem is the same as that of the modem (the original ADSL modem). It just replaces the telephone line with optical fiber. The optical modem comes with several sockets, one for connecting to the TV (depending on whether you have activated this service), one for connecting to the computer (LAN port), and one for connecting to the phone (LINE port) (the specific number of ports depends on the model of the optical modem, at least one of each). The configuration of the optical modem is the job of the installer. If you go online, it is the same dial-up Internet access as ADSL. In fact, you can basically use it the same as ADSL. The difference is that the line entering the house has been changed, and after the telephone interface is connected to the device, a TV interface has been added. However, it should be noted that 1. Optical fiber is not like the previous copper wire. Optical fiber is more fragile, especially the head of the optical fiber is the easiest to break. 2. It is best not to cut off the power to the optical modem, as the phone will have no signal if the power is cut off.

　　Since Ethernet technology has been widely used, including electrical and optical ports. The HUB (switch) technology of Ethernet electrical and optical ports is mature, reliable and cheap. If users who use FTTH want to expand multiple optical fibers to the desktop, they only need to add a HUB with multiple Ethernet optical ports. Note that if you are a FTTH user of Telecom, set the IP of multiple optical ports of the HUB to DHCP (automatically obtain IP addresses). If you are a FTTH user of Netcom, modify the last digit to a different value according to the IP address provided by the Netcom service provider.

　　Boshi Electronics also provides the Ethernet interface fiber optic transceiver OPET100L. The size of OPET100L is the same as that of USB fiber optic transceiver, but the difference is that the electrical port is RJ-45 Ethernet port, and no driver needs to be installed, but an external 5V power supply is required. OPET100L can be used in pairs, and can also communicate with Ethernet optical ports that meet the 100Base-TX standard, such as USB fiber optic transceivers.

　　Figure 4 Comparison between OPET100L and traditional fiber optic transceivers

　　Figure 4 shows the comparison between the Bosch fiber optic transceiver and the TP-LINK TR-932 Ethernet fiber optic transceiver. It can be seen that the volume is less than half of the TR-932, the power consumption is much lower, and there is no jumper setting. The TR-932 is already relatively small in size among similar products. Although current computers all have an RJ-45 Ethernet electrical port, with the popularization of fiber to the home, future computers will all have an SC Ethernet optical port. In the transition process from now on, the USB fiber optic transceiver is the most suitable device to convert the existing RJ-45 to an SC optical port, and because of its small size and no need for power supply, it can be placed on the desktop of the user terminal. OPET110U and OPET100L are the best choices to replace the current traditional Ethernet fiber optic transceivers and dominate the fiber to the home terminal.