www.szchuangmo.com

1310nm vs 1550nm,which shuold i choose?

Views : 1471
Update time : 2021-03-17 13:55:36

How to choose between 1310nm and 1550nm wavelength for fiber optic network.

Infra-red wavelengths provide lower loss

RF over fiber uses infra-red lasers because attenuation in the glass fiber is much lower in the infra-red region than at other wavelengths. Longer wavelengths generally means lower loss, however, above the infra-red region thermal background energy increases the noise floor significantly.

Causes of losses in RF over fiber

Losses in fiber are caused by (i) absorption and (ii) scattering. Absorption occurs at a number of specific wavelengths. It is caused by water vapour in the glass absorbing the light energy. These specific wavelengths are consequently referred to as “water bands”. Scattering is caused by light energy bouncing off molecules within the fiber. The amount of scattering which occurs is a function of the wavelength. Shorter wavelengths have higher levels of scattering. Choices of wavelength therefore consider the location of the water bands and the amount of scattering. The wavelengths 1310nm and 1550nm have become global standards. ViaLite RF over fiber links are available at both of these wavelengths.

Why is lower loss important?

Minimizing losses means better signal to noise ratio and dynamic range which means a higher quality signal. It also means a longer potential link distance. ViaLite links are available up to 100km.

Why not use 1550nm all the time?

Since operating at 1550nm provides the best performance, it seems logical to choose 1550nm for every link. However, a major part of the link cost is the laser. Lasers operating at 1550nm are more difficult to manufacture than those at 1310nm and consequently are more expensive. Therefore shorter links (up to 10km) would typically use a 1310nm laser because it provides good performance at a lower cost. Longer link distances (10-100km) where losses become more critical to performance would typically use the higher cost 1550nm laser since these link lengths are not feasible with the fiber losses which occur at 1310nm.

Combining 1310nm with 1550nm for a bi-directional link

Since RF over fiber is inherently mono-directional, using a single fiber for a bi-directional link requires the use of more than one wavelength. In this scenario the use of 1310 nm and 1550nm can be combined. E.g. the transmitter at point A would be 1310nm and the receiver 1550nm, whilst at point B the situation would be reversed.
Related News
Shenzhen Chuangmo Electronics Showcases Cutting-Edge Innovations at 2024 CHWE Exhibition for Cross-Border E-Commerce Shenzhen Chuangmo Electronics Showcases Cutting-Edge Innovations at 2024 CHWE Exhibition for Cross-Border E-Commerce
Aug .02.2018
Explore the dynamic world of cross-border e-commerce innovation with Shenzhen Chuangmo Electronics' participation at the 2024 China Hi-Tech Fair for Cross-Border Electronic Commerce (CHWE) in Shenzhen. Through a showcase of cutting-edge products and a commitment to seamless user experiences, Shenzhen Chuangmo Electronics demonstrates its dedication to revolutionizing the digital marketplace. Discover how this industry leader is shaping the future of cross-border commerce through innovation, collaboration, and a vision for global connectivity.
Shenzhen Chuangmo Electronics Technology Co.,Ltd. Showcases Cutting-Edge Two-Way Video Calling Cameras at 2024 CES Shenzhen Chuangmo Electronics Technology Co.,Ltd. Showcases Cutting-Edge Two-Way Video Calling Cameras at 2024 CES
Aug .02.2018
Discover the future of communication with Shenzhen Chuangmo Electronics Technology Co.,Ltd.'s latest innovation showcased at the 2024 Consumer Electronics Show (CES): the two-way video calling camera. This groundbreaking device redefines the way individuals connect and collaborate, offering unparalleled clarity, convenience, and versatility. Equipped with state-of-the-art technology, including high-definition optics and advanced image processing algorithms, our camera facilitates seamless communication experiences across various platforms and devices. With a vision to transcend boundaries and empower meaningful connections, Shenzhen Chuangmo Electronics Technology Co.,Ltd. continues to push the boundaries of innovation and shape the future of communication. Join us on our journey as we pave the way for a more connected and collaborative world.
2023 Hottest Video Calling Camera 2023 Hottest Video Calling Camera
Aug .02.2018
The Video Calling Camera is a device that introduces two-way visual communication, and simplifies the video communication experience with exceptional flexibility, advanced human detection, and tracking capabilities. It is a breakthrough product that combines cutting-edge technology with an exceptional user experience.
Shenzhen Chuangmo Electronics's EDFA: The Future of Fiber Optic Communication Shenzhen Chuangmo Electronics's EDFA: The Future of Fiber Optic Communication
Aug .02.2018
Shenzhen Chuangmo Electronics Technology has launched a new fiber optic amplifier called the EDFA, which promises to revolutionize communication systems. With the capability of amplifying optical signals over long distances, the EDFA will provide significant improvements to the transmission of data, voice, and video over fiber optic cables. The product is expected to be a game-changer in the field of communication technology.