What Are the Pros and Cons of Fiber-Optic Broadband?

Optical fiber broadband is to convert data to be transmitted from electrical signals to optical signals for communication. "Optical cats" are installed at both ends of the optical fiber for signal conversion. The difference between fiber broadband and ADSL access methods is that ADSL is electrical signal propagation, and fiber broadband is optical signal propagation. Optical fiber is the most ideal of a variety of transmission media in a broadband network. It is characterized by large transmission capacity, good transmission quality, small loss, and long relay distance. Optical fiber transmission uses wavelength division multiplexing, that is, the data of multiple users in a cell is multiplexed into high-speed signals using PON technology, and then optical signals modulated to different wavelengths are transmitted in a single optical fiber. ^[1]

(1) Extremely wide frequency band and large communication capacity. Fiber has a much larger bandwidth than copper or cable. ^[3]

Optical fiber has become a very important information communication medium in the networked era. The more common optical fiber wavelengths are generally 1310 nanometers, 1490 nanometers, and 1550 nanometers. In this paper and 1550 nanometer particles, the optical module in the FTTH broadband system is 20 kilometers, and the optical fiber is single fiber mode , Up 1310 nm, down 1490 nm. In addition, the light source device is an important part of the optical fiber propagation system, and the application of the access network is more common, and is generally divided into an optical splitter and an optical connector.

1. Optical splitter ^[4]

According to the distance from the fiber to the user, it can be divided into fiber to the cabinet (FTTCab), fiber to the curb (FTTC), fiber to the building (FTTB) and fiber There are 4 types of services such as Fiber To The Home (FTTH). The above services can be collectively referred to as FTTx. ^[5]

In fiber-optic broadband installation projects, standardized installation operations should be carried out according to actual conditions to improve the stability and orderliness of the operation process. ^[4]

Common equipment mainly includes cutting knives, red light source pens for welding machines, optical power meters, etc., which play their own application value. Based on this, technicians must perform routine equipment maintenance in combination with actual management needs in daily maintenance, and fundamentally guarantee the maintenance effect of each installed equipment and tool. ^[4]

In fiber-optic broadband, some error codes often appear, which indicates that problems occur during the broadband connection. ^[10]

1. Coexistence of digital system and analog system.

Optical fiber broadband network resources and the digital system boom period, but the application of analog broadband network is still the mainstream trend, the main reason for this phenomenon is the role of economic indicators. It is feasible for our national system to use analog broadband in a certain period in the future, so the analog broadband network occupies most of it. However, affected by the increase in the number of users and the economy, the exchange method will be dominated by space division broadband PABX. Broadband digital networks will first be applied to the links between military command posts, in addition to using weapon inspection systems and some important security departments. At present, digital networks will be used less frequently than analog networks, but as the main development direction of digital networks in China, once high-speed large-scale integrated circuit technology continues to mature in the future and is widely applied to the market, digital systems The Internet will become a leading force in China's Internet market. Based on the above inferences, we can know that the coexistence time of the digital system and the analog system of the broadband network must be longer than the coexistence time of the digital system and the analog system of the narrowband service. ^[11]

2. Development of optical broadband integrated service digital network.

The broadband integrated service digital network should be abbreviated as B-ISDN, and it is undeniable as our main research direction at present. Because the network is a combination of broadband services and narrowband services, the comprehensive network issues involved in narrowband services must first be resolved. The integrated service digital network is based on 64KB / S. It needs to be combined with PASDN technology with ISDN function, and a series of in-depth research work should be performed on the basis of effective combination. ^[11]