Optical fiber LED light source test special light source, is essential for the Optical fiber light source test. So why do you want to use the fiber optic light guide LED light source to test the fiber optic light guide? This is because the light is different from 850nmLED and 850 VCSEL nm. In technical terms, the light emitting form of the two light sources is different. The whole cross section of the fiber optic light guide LED light source is relatively uniform in the whole cross section of the fiber core. On the contrary, the beam emitted by the VCSEL light source is narrow, its emitted light in the core center, weakened rapidly after leaving the centre; close to the cladding interface where disappeared. Two different luminous forms lead to loss of measurement results difference. The fiber LED light source test is very different from the single mode test.

We are focus on the special LED and application module on the medical lighting and UV market.please contact us:kevin@sunerled.com or http://www.sunerled.com/English/

Table 1 is a typical optical fiber LED light source and VCSEL light source. It can be found that the spectral width of VCSEL is much smaller than the spectral width of the optical fiber LED light source, so compared to the fiber optic light guide LED light source， LD can be said to be a single wavelength injection. At the same time, the optical fiber LED light source and the LD light source are different. The fiber optic light guide LED light source has a larger output area, and can stimulate all the conduction modes of the multimode optical fiber, and the light emitting spot of the LD light source can only excite a part of the conduction mode. When LD is injected into the different position of the end face of the multimode fiber, the different modes are excited, and the dispersion of the multimode fiber can be greatly different. Comparison of optical fiber LED light source and VCSEL exit spot.

Comparison between LED and VCSEL output beam spot

 

Link authentication for Optical fiber LED light source: generic or default specification and specification of light source

TIA and ISO standards, Optical fiber LED light source link certification should include two common wavelengths of the optical fiber loss measurement and the link in the polarity of the two fiber. Horizontal wiring maximum length of 100 meters, optical fiber LED light source only to a wavelength for testing.

TIA-568-B.1 standard light source is classified into 5 categories, from 1 kinds of typical LED light source to 5 kinds of FP laser. VCSEL is usually classified as 3 or 4. This is very important, because the fiber optical waveguide LED lighting source signal loss is greater than (more than) Optical fiber light source (1 categories). As a result, the standard for the use of fiber optic light sources is indicated to be more conservative or "worst" unless the work instructions are required or provided with a specific light source.

The accuracy of loss measurement is very important for high speed network

Gigabit Ethernet standard limits the value of the loss as the speed of the network becomes more and more small. For example, in fiber optic light guide LED light source support of the 100 M/ sec Ethernet (100BASE-FL) fiber channel (62.5 m) loss limit value is 11 dB, but the same type of fiber channel loss limit value is 2.38 dB (for 1000BASE-SX), and a higher level of Optical fiber light source bandwidth fiber length is limited to 275 meters. It is very important to use the test Optical fiber LED light source equipment which can accurately measure the difference.

When using the fiber optic light guide LED light source, the technical personnel should use the appropriate reel to measure the link loss. If you don't use the scroll, the value of the measurement will be magnified. Use VCSEL or optical fiber LED light source to measure the loss when the need to use the scroll.

 

Test the new installation or existing multi-mode wiring installation system, to test whether the installation link has sufficient performance to upgrade the network to Gigabit Ethernet, using VCSEL and laser light source can make more effective and appropriate test results. If you want to use the fiber optic light guide LED light source instead of the default optical fiber LED light source specifications to test the installation system.

We are focus on the special LED and application module on the medical lighting and UV market.please contact us:kevin@sunerled.com or http://www.sunerled.com/English/