Zhao Zi
Introduction: optical fiber communication technology still much room for development in the future there will be great demand and the market. Mainly the following: fiber to the home FTTH, optical switching and integrated optoelectronic devices, will have greater development.
Recently it has been the development of optical fiber communication scenarios, some confusion. First, the IT industry in 2000, the bubble, so that the production scale of input optical fiber communication is too large, overproduction, IT industry, many small companies closed down. Especially for the fiber, the Chinese foreign dumping. Second, some people think: the transmission capacity of optical fiber communication has reached 10Tbps, almost used up, and now has a large trunk and build almost buried in the remaining fiber is also a lot of fiber-optic communications technology does not need more development.
I think, optical fiber communication technology there is considerable room for development in the future there will be great demand and the market. Mainly the following: fiber to the home FTTH, optical switching and integrated optoelectronic devices, will have greater development. Following the development of optical communications are discussed trends and market:
First, the development trend of optical fiber communication
1, the development of optical fiber to the home FTTH
FTTH can provide a very rich bandwidth, it has always been considered the ideal access method for achieving an important role in the information society, also need large-scale promotion and construction. FTTH may be required to existing optical fiber dressing 2-3 times. In the past, the high cost of FTTH, the lack of broadband video services and broadband content and other reasons, so that FTTH is also not on the agenda, only a small number of tests. Recently, due to advances in optoelectronic devices, optical transceiver modules and optical fiber greatly reduced prices, coupled with easing of broadband content, both accelerating the process of practical FTTH.
Developed countries are not identical views on FTTH: U.S. AT & T that FTTH market small, in OFC2003 declared: FTTH market in 20-50 years later. U.S. business Verizon and Sprint is running a more positive, to 10-12 years in the transformation of networks with FTTH. Japan's NTT FTTH development of the first, and now for nearly 2 million users. At present, China FTTH in the pilot phase.
* FTTH fiber to the home challenges: It is now widely used ADSL technology provides broadband services still an advantage. Cheap compared with the FTTH network using the existing copper wire to make construction simple and the current 1Mbps-500kbps transmission of programming to meet demand. FTTH now widely promoted by the constraints.
For the near future to develop broadband services, such as: online education, online office, video conferencing, online gaming, remote clinics, and other two-way business and high-definition HDTV digital TV, asymmetric uplink and downlink transmission business, ADSL will be difficult to meet . In particular, HDTV, through compression, the current transmission rate still needs its 19.2Mbps. Is using H.264 technology development, compressible to 5 ~ 6Mbps. QoS is usually considered to be guaranteed the maximum ADSL transfer rate is 2Mbps, is still difficult to transmit HDTV. FTTH that the HDTV was the main driving force. That the advent of HDTV services, non-FTTH is not.
* FTTH solution: usually point to point and PON PON P2P networks into two categories.
P2P program?? Advantages: the user independent transmission, independently of each other, institutional change and flexible; can use inexpensive low-speed optoelectronic module; transmission distance is long. Disadvantages: In order to reduce the user directly to the Board of fiber and pipelines need to rehouse a summary of the user area of active nodes the user.
PON program?? Advantages: a simple passive network maintenance; in principle, can save optoelectronic devices and optical fiber. Disadvantages: need to use expensive high-speed optoelectronic modules; need to distinguish the user from the use of different electronic modules, in order to avoid conflict with the user uplink signal; transmission distance than the shorter sub-PON; the user's downstream bandwidth of each occupation, if users have the bandwidth not a guarantee, not only to network expansion, but also need to be replaced and the replacement of the user module PON solution. (According to the current market price, P2P economy than the PON).
PON There are many, generally as follows. APON: the ATM-PON, for ATM switching network. BPON: the broadband PON. GPON: using Generic Framing of GFP-PON. EPON: use of Ethernet technology, PON, GEPON is a complete Gigabit Ethernet PON. WDM-PON: WDM used to distinguish the user's PON, as the user with the wavelength, so to maintain the inconvenience, rarely used in FTTH.
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