Practical application of XYT Raman amplifier in ultra-long-distance optical transmission project-纤亿通

Practical application of XYT Raman amplifier in ultra-long-distance optical transmission project

[来源：XYTSHARETOP] [日期：2021-09-15] [点击数：1489]

To achieve ultra-long-distance transmission, an important issue is to reduce the loss of the optical fiber as much as possible. We know that the optical fiber has a certain loss, the optical signal will be attenuated when transmitted along the optical fiber, and the transmission distance will be restricted by the attenuation. In order to transmit the signal farther, the optical signal must be enhanced.XYT-Sharetop has many successful project cases in long-distance transmission, and these projects have also been unanimously recognized by customers at home and abroad, as follows:

(1) XYT-Sharetop successfully implemented a project in a Southeast Asian country and built a 2800km wavelength division multiplexing transmission system, 16 channels of 160G services are transmitted through two optical fibers, and any business node in the middle can download and upload services!XYT-Sharetop The design of long-distance wave division transmission scheme is used to simplify the complex, and the comprehensive networking methods such as chain, star and ring are adopted to realize the long-distance transmission system that meets the customer's business needs. The line adopts DWDM wavelength division multiplexing technology, uses highly integrated comprehensive transmission platform equipment (XYT-1600), and realizes backbone network formation through two cores. The solution achieves a point-to-point distance of up to 150km, fully solving the problem of no available relay point in the middle, saving the customer's network cost to a certain extent, meeting the delay requirement, and achieving the customer's set goal.

(2) According to the needs of the network supervision department of the public security department of a city,XYT-Sharetop provides a "high bandwidth, less fiber core, low delay, and protective ring" security monitoring optical fiber transmission solution. This solution has a single span of more than 100 kilometers, through relay regenerative amplification, and transmission of more than 1,000 kilometers using optical fiber wavelength division multiplexing technology. The backbone fiber core only needs 2 cores. Through the OTN transmission platform and OLP card, the security monitoring belt is protected and reduced. The fiber core and high bandwidth ensure stable and transparent transmission of services, so as to avoid the influence of force majeure factors such as fiber breakage and earthquakes on monitoring services.

According to the above long-distance transmission projects, we can clearly see that the project’s ultra-long-distance optical transmission has the following problems: (1) The optical fiber loss caused by long-distance transmission is too large; (2) The cost is high; (3) A relay station needs to be provided Point, there may be a problem of power supply difficulties. (4) It is difficult to install, and other factors have to consider the interference to the line; Faced with the problems of long-distance transmission,XYT-Sharetop has launched the corresponding independent research and development products:

①OLP rack-mounted optical protection equipment

Features:

1. Interface light path status indicator display

2. Switching threshold power and alarm threshold power can be set through the device LCD screen or network management channel

3. There are two working modes: automatic return to main road mode and no automatic return mode

4. The main device switching time of the receiving end has automatic, forced manual and remote switching

5. Automatic switching time: 1+1<25ms, 1:1<50ms

6. Dual power supply redundancy, support hot swap

7. With WEB, CLI, SNMP remote network management functions

②Raman Fiber Amplifier

Features:

1. Based on stimulated Raman scattering mechanism;

2. Output port: 4~16 channels are optional;

3. Output optical power: total output up to 5W;

4. Low noise figure: less than 5dB at 0dBm input;

5. Complete network management interface, in line with national standard SNMP network management;

6. The intelligent temperature control system makes the power consumption of the whole machine lower

③1U Rack DWDM

Features:

1. Low insertion loss

2. High isolation

3. Wide transmission wavelength

4. Wide transmission wavelength

5. High channel isolation

6. High stability and reliability

7. No glue loop

④Dispersion compensator

Features:

1. DWDM system wide-band dispersion compensation and extremely low residual dispersion

2. G.652 fiber C-band 100% slope compensation (standard value)

3. Low insertion loss

4. Low polarization mode dispersion

5. Performance indicators have passed Telcordia GR-2854-CORE standard certification

6. Reliability passed Telcordia GR-1221-CORE standard certification

7. Different packaging styles, connector types and jumper lengths are available

Among them, the Raman fiber amplifier (RFA) is an important part of the dense wavelength division multiplexing communication system. In many nonlinear optical media, the scattering of pump light with a shorter wavelength causes a small part of the incident power to be transferred to another beam whose frequency is shifted down. The amount of frequency shift down is determined by the vibration mode of the medium. This process is called pulling Mann effect. If a weak signal and a strong pump light wave are simultaneously transmitted in the fiber, and the weak signal wavelength is placed within the Raman gain bandwidth of the pump light, the weak signal light can be amplified. This mechanism is based on stimulated Raman scattering The optical amplifier is called RFA. RFA is mainly divided into two categories: discrete RFA and distributed RFA.

(1) Discrete RFA. Discrete RFA uses special fibers with higher Raman gain coefficients (such as highly doped germanium fibers, etc.). The length of this fiber is generally a few kilometers. The pump power requirements are very high. Generally it is several W. Discrete RFA can produce high gain of more than 40 dB, like EDFA, it is used for lumped amplification of signal light, so it is mainly used to realize the band that EDFA cannot amplify.

(2) Distributed RFA. Distributed RFA can greatly improve the performance of the optical transmission system. From the perspective of technical principles, only Raman amplification technology can achieve distributed amplification in the optical transmission process. Therefore, distributed RFA is The application prospects in the system are becoming increasingly important.

The design plan ofXYT-Sharetop Wavelength Division Multiplexing system is specially designed for high-speed and large-bandwidth transmission of intelligent optical networks. Choosing us will not only save fiber resources, but also get unprecedented customer service, so that your problems can be solved perfectly.

XYT-Sharetop was established in 2012, focusing on optical communication 5G, data center, optical transmission and other fields. It is a professional optical fiber network transmission solution provider integrating R&D, production and sales. Our mission is to meet the actual needs of customers. Solve problems for customers in a timely manner. The work of commissioning optical networks or investigating transmission lines for customers on business trips time and time again shows that the most important thing forXYT-Sharetop is to serve customers and give customers an almost perfect user experience.XYT-Sharetop has always insisted on creating the highest value for batches of new and old customers with the most suitable price, best service, and high-quality WDM products.

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Practical application of XYT Raman amplifier in ultra-long-distance optical transmission project