USB fiber optic transceiver: fiber-to-the-home terminal preferred

Fiber to the home, English abbreviation FTTH (Fiber To The Home), from the telecommunications company to the user's home, the entire process is Fiber Optic Cable. When the fiber arrives at home, it does not mean that the fiber arrives at the user terminal (computer). It also needs to connect the fiber transceiver to the user terminal (computer) to be the real "fiber to the user" - "fiber to the user", or " Fiber to the desktop." FTTH can achieve a bandwidth of 10M/100M or even 1000M.

Figure 1 USB fiber optic transceiver on the notebook keyboard outline drawing

The traditional fiber optic transceivers are all connected to the Ethernet port, which is the RJ-45 port. Most of them are large iron shells and must be connected to an external power supply. The average user does not like to put such a fiber optic transceiver on the desktop. Boss USB fiber optic transceiver directly converts a pair of fiber optic transceivers from USB for remote transmission without external power supply. It is the industry's smallest fiber optic transceiver and supports both single mode and multimode fiber. The optical port is 100Base-FX conforming to the IEEE802.3u Ethernet standard, which is the standard for 100M/10M Ethernet fiber optic signals, so it can communicate directly with other standard Ethernet fiber optic transceivers. Boss USB optical transceiver not only changed the traditional RJ-45 port to USB port, but also subverted the size and shape of the traditional Ethernet fiber optic transceiver, and abandoned the traditional large iron box shape, also created in single mode and A technology that can be transmitted in multimode fiber. The power-free feature makes USB fiber optic transceivers the first choice for Ethernet devices such as notebooks, tablets, and smart phones. It is also the first choice for fiber-to-the-home! The product has an ultra-small form factor (74*23*47mm) and implements obeying Ethernet. Network standard fiber optic transmission, only need to install drivers, no need to modify existing software. The OPET110U is a dual-fiber version that can be used in pairs or with other Ethernet interfaces that comply with the 100Base-TX standard. The OPET110U1 is a single-fiber transceiver that uses only one fiber to transmit and receive, and is used in pairs. Due to the use of optical fiber as the communication transmission medium, it has the advantages of isolation high voltage, anti-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, its functionality has not been reduced, and it has added a unique single-mode multi-mode general-purpose technology. As shown in Figure 2, the USB port, power indicator, optical port indicator, electrical port indicator, and 10M/100M indicator are all available.

Since the intermediate links are all optical fibers, Fiber to the Home (FTTH) greatly increases the bandwidth. Advantages of FTTH: 1. FTTH has the advantage of high bandwidth, which can meet the needs of home ITV, video surveillance, call, environmental monitoring, etc. There are optical cables in the house, so there is no need to re-wire telephone lines and cable TV lines in the future. !2, FTTH is home, the Internet bandwidth can reach the maximum, can guarantee 10M, 100M or even more 1000M, can be satisfied. 3. The network is stable. Signed in light transmission attenuation, anti-electromagnetic interference and other characteristics, FTTH network stability is better, uploading and downloading rate is more stable. The fascination of fiber-to-the-home is that it has great bandwidth. It is the best solution to solve the "last mile" bottleneck from the Internet backbone to the user's desktop.

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

Figure 3 USB fiber transceiver wiring diagram

Today's fiber-to-the-home technology is not staying in the lab. Please see the 2012 preferential measures launched by a certain telecommunications company: 1. Telecom users can change to fiber-optic access for free when they have qualified areas, and increase the telephone bill by 20 yuan. . 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 has not exceeded the maximum rate limit of ADSL, and there is still much room for development in the future of FTTH. From 2011, FTTH access technology will be adopted in new residential areas and new rural construction new villages in a certain city. Currently, some communities have taken the lead in using FTTH access methods. The application of this technology will provide the development of broadband services such as IPTV. Good network platform. The fiber-to-the-home installer will pull a fiber from the outside to your home, and then give you a device called a light cat (onu). The light cat is installed the same way as the modem (the original adsl cat). Just replace the phone line with fiber. Light cat comes out with several sockets, one is connected to the TV (depending on whether you have opened this business), one is connected to the computer (LAN port), and the other is the answering phone (LINE port). Depending on the model of the light cat, at least one each). The configuration of the light cat is a matter for the installer. If you go online, it is the same dial-up Internet as ADSL. In fact, you can basically use it like ADSL. The difference is that the line of the household is changed, the telephone interface is connected to the equipment, and a TV interface is added. However, it should be noted that 1. The fiber is not more brittle than the previous copper wire, and the fiber is the most vulnerable. 2. Light cats are best not to power off, there is no signal when a power off phone.

Due to the extensive use of Ethernet technology, including electrical and optical ports. The HUB (switch) technology of Ethernet electrical ports and optical ports is mature, reliable, and inexpensive. Users who use FTTH need to add a HUB with multiple Ethernet ports if they want to expand multiple fibers to the desktop. Note that if it is a telecom FTTH user, set the IP of multiple optical ports of the HUB to DHCP (automatically obtain an IP address). If it is a FTTH user of Netcom, the last digit can be modified to a different value according to the IP address provided by the Netcom service provider.

Bosch Electronics also offers the optical transceiver OPET100L with Ethernet interface. The OPET100L is the same size as the USB fiber transceiver. The difference is that the electrical port is an RJ-45 Ethernet port. No driver is required, but an external 5V power supply is required. The OPET100L can be used in pairs or with an Ethernet optical port that conforms to the 100Base-TX standard such as a USB fiber transceiver.

Figure 4 OPET100L compared to traditional fiber optic transceivers

Figure 4 shows a comparison of the Bosch fiber optic transceiver with the TP-LINK TR-932 Ethernet fiber optic transceiver. The visible volume is less than half of the TR-932, the power consumption is much smaller, and there is no jumper setting. The TR-932 is already relatively small in its class. Although the current computer has an RJ-45-seat Ethernet electrical port, with the popularity of fiber-to-the-home, future computers will all have an SC-port Ethernet optical port. From the beginning of the transition process, the USB fiber optic transceiver is the most suitable device for converting the existing RJ-45 to the SC optical port, and it can be placed on the desktop of the user terminal because of its small size and no power supply. The OPET110U and OPET100L replace the current traditional Ethernet fiber optic transceivers and dominate fiber-to-the-home terminals as the best choice.