Optical fiber transmission achieves the dream of video surveillance HD

The optical fiber broadband industry is one of
the fastest growing industries with the largest development space in the current information industry.
Accelerating the construction of optical fiber broadband networks can promote the upgrading of network infrastructure, improve independent innovation capabilities, and stimulate the development of related industries, which is of great strategic significance
for coping with the financial crisis, achieving stable growth, adjusting the structure, protecting people's livelihood, promoting stability, and even enhancing the country's long-term competitiveness.
In the field of video surveillance, the application of optical fiber transmission is widely promising
.

Fiber optic monitoring: practical applications of new security technologies

At present, there is also a series of optical fiber monitoring technology
in China.
Around 2000, Fudan University and other scientific research institutions began to develop optical fiber dynamic monitoring technology, and in 2005, optical fiber detection and alarm products were put into trial
.
Based on optical fiber dynamic sensing technology, a series of products such as optical fiber intrusion vibration detection, optical fiber voice monitoring, optical fiber line security monitoring and optical fiber pipeline safety monitoring have been put on the market, which have outstanding characteristics
.

This type of system requires the integration of optoelectronics, materials, physics, electronics, communications, computers and other disciplines, and generally requires scientific research institutions with deep technical backgrounds to host research and development
.
At present, this technology is completely independently developed by China and the technical route is internationally original, which has filled the domestic gap and fully caught up with similar foreign technologies
.
A number of technical achievements have reached the international leading level
in theory and technology.
Various ministries and commissions of the state, science and technology departments of some provinces and cities, including some industry competent institutions have begun to advocate the further deepening and application
of this technology.
This technology has been successfully put into use
during the Olympic Games and the World Expo.
Outstanding features of this type of monitoring technology include:

It is concealed and easy to deploy
.
Outstanding vandal
resistance.
Optical fiber has the advantages of long transmission distance without relay, little dependence on energy, and no power supply is required for the sensor network deployed in the entire monitoring area, so it greatly reduces the risk that
electronic equipment may pose a safety hazard to wooden or other material structures 。 Different from the general linear or physical blocking detection system easy to avoid the gap, the optical fiber sensor network through the three-dimensional collaborative perception function, like a huge neural network, from the ground, underground and space for voice pickup, can accurately perceive the entire layout area of the change and sound, all-round environmental change intrusion detection, through intelligent behavior analysis and pattern recognition, accurate analysis and judgment, the environmental impact that may produce false alarms is eliminated.
Ensure that the system makes highly accurate notifications and alarms
.

The optical fiber itself is a non-metallic passive device, not afraid of lightning and lightning, in the natural environment, will not corrode, not afraid of rain and snow, and can even be used in wet and water environments
.
At the same time, the optical fiber sensor has no energy dissipation, will not become a heat source, is suitable for flammable and explosive places, and meets high-level fire protection requirements
.
It is very suitable for important places
with high security protection level and special safety requirements such as Wenbo.
Optical fiber voice monitoring is not subject to various electromagnetic interference, will not produce the current and electrical signal noise common to electronic eavesdropping equipment, and can synchronously restore the sound of the monitoring scene with high fidelity and no delay
.
Optical fiber monitoring technology does not conflict with existing video, infrared and other systems, can be compatible and used, and truly touch, hear, see
.

Optical fiber transmission facilitates the development of high-definition surveillance

With the increasing number of various image states and data monitoring requirements, the image signal transmission distance can no longer meet the demand, so the optical fiber integration image and control signal (WDM or DWDM technology) is gradually developed, which can transmit longer distances
.
In addition to the requirements of combining image and control, the architecture of optical fiber monitoring transmission is the main axis of the entire optical fiber transmission construction, and with different deployment methods, there will be different uses and functions
.

The application range of optical fiber communication is quite extensive, which can be roughly divided into telecommunication network (Telecom), data network (Datacom), monitoring network (CCTV) and cable TV (CATV) optical fiber transmission network and optical fiber user loop (FiberInTheLoop, FITL) and other five categories, and national defense and military can also see the application
of optical fiber communication.

In the field of surveillance network (CCTV), it is mostly used as the backbone part of the monitoring architecture, which may combine simple image and control signals to convert optical signals (FOT/FOR), and also convert digital image signals into optical TCP/IP signals through TCP/IP networks for transmission and restoration
.

With the development of optical fiber communication technology, there are more and more ways of image transmission, and the video signal transmission of optical transceiver has greater advantages
than other such as twisted pair transmission and coaxial cable transmission.
As we all know, optical fiber transmission mainly relies on the optical transceiver to convert one end of the optical fiber (cable) into an optical signal, and at the other end to convert the optical signal back to the corresponding electrical signal
.
The optical transceiver provides flexible transmission and networking methods for the monitoring system, with good signal quality and high
stability.

In recent years, due to the rapid development of optical fiber communication technology, the cost of optical fiber transmission monitoring system has been greatly reduced, so the application of optical fiber and optical transceiver in monitoring system is becoming more and more popular
.
Optical fiber has been widely used in home optical fiber and office access network, in the fields of
home intelligence, office automation, industrial control network, vehicle airborne and military communication network.
For high-definition video streams with high transmission bandwidth and transmission distance requirements, it is no longer a dream
to achieve high-definition monitoring with the advent of the optical fiber era.

The direction of the development of the domestic optical fiber transmission industry

The implementation of the broadband national strategy will surely bring about the great development and prosperity
of optical fiber access technology.
China should seize this rare opportunity to seize the commanding heights of access technology, lay a solid foundation for the rollout of broadband applications and services, and let the people truly enjoy low-cost and high-quality broadband services
.
The optical fiber broadband industry is one of
the fastest growing industries with the largest development space in the current information industry.
Accelerating the construction of optical fiber broadband networks can promote the upgrading of network infrastructure, improve independent innovation capabilities, and stimulate the development of related industries, which is of great strategic significance
for coping with the financial crisis, achieving stable growth, adjusting the structure, protecting people's livelihood, promoting stability, and even enhancing the country's long-term competitiveness.
In order to grasp the important opportunities for the development of optical fiber access, we must make efforts from the following three aspects to seize the commanding heights of technological innovation:

The first is to increase the innovation of optical fiber access technology and study original optical fiber access technology
suitable for China's characteristics.
As of 2011, the national fiber broadband users cover more than 80 million, and the new broadband users will exceed 50 million
within three years.
However, compared with developed countries, at present, China still has great deficiencies in the original technological innovation of optical fiber access, and the access cost of optical fiber access users is still relatively high
.
Therefore, it is recommended that the state increase policy support by setting up major special projects for the original innovation of optical fiber access technology, form international standards, patents and norms for optical fiber access with independent intellectual property rights, and study low-cost optical fiber access products that meet China's application needs and network needs, so as to better seize the commanding heights
of optical fiber access technology innovation.

The second is to strengthen the technological innovation of optical communication core network to effectively meet the higher requirements
of broadband optical fiber access for core network bandwidth and service processing capabilities.
With the rapid growth of broadband optical fiber access users, the society's demand for information has expanded sharply, especially in the past few years, Internet traffic has been in explosive growth, the existing core network technology will not be able to effectively meet the huge demand
formed after the popularization of broadband optical fiber access in the future.
In order to better support the construction of national broadband infrastructure, research and innovation on key technologies of core networks should be increased, such as 1Tb/s single-source optical transmission technology, 100GDWDM ultra-large capacity optical transmission technology, all-optical switching technology, etc
.
It is recommended that the state support relevant enterprises in core network technology research and development through special funds, tax return subsidies, special appropriations, etc.
, so as to better compete for the right to speak in global optical communication core technology innovation and promote the construction and development
of China's optical fiber broadband network.

The third is to strengthen the research on
technologies, standards and products related to the last 100-meter access of optical fiber broadband networks.
Because on the optical fiber access user side, especially in the home of optical fiber to the home, China's existing optical fiber access technology is not suitable for the full popularization of optical fiber to the home in terms of standards, technology, product realization, engineering design and implementation, and there is still a lot of room
for improvement in the quality, reliability and applicability of access products in the construction of many optical fiber access networks.
Therefore, it is recommended that for the last 100 meters of optical fiber access, the state should increase the layout
in terms of policies, projects and financial support.
Through policy guidance, strengthen research and innovation in related technologies and standards for optical fiber access users, and relevant parties also need to further tighten the quality and reliability requirements of access products, increase implementation in popularizing and forcing the deployment of various new small bending radius optical fibers in new urban buildings, and further popularize education on the safe use of optical
fibers.