Is it possible to splice and joint between Singlemode and Multimode Fiber Optics? The latest fusion splicing machine is able to detect fiber of different sizes particularly between singlemode and multimode. The fusion splicing machine will display fiber type on its LED screen either as MM or SM. But will the machine proceed with the fusion splicing or jointing between fiber optics of different sizes? Let us see the video below.. a. The type of fiber optics either SM or MM is indicated clearly on the screen. b. Please observe carefully the fusion evenness between SM and MM fiber. Let us double check with Visual Fault Locator to see if there is any light leakage at splice point between MM and SM fiber optics.. Let inject laser VFL from MM side. The SM fiber optics fiber is of white color and the orange color is of MM type. There is light leakage at splice point as shown in the above video. This can be translated as high splice loss value. Let us inject laser VFL from SM side into the splice point. Would there by any light leakage at the splice point? As shown in the above video, apparently there is no light leakage detected at splice point. This is the opposite what being shown if light is injected from the MM side. What will it shown on the OTDR if fiber different sizes being spliced?
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Always double check your fiber optics pigtails continuity prior to splicing.. In this case the fiber optics participants managed to find out the actual problem with regards to final insertion loss test. The fiber optics handy troubleshooting tools , VFL (Visual Fault Locator) , is used to check fiber optics pigtail continuity..
FAT FIBERReceived splicing machine message error as "FAT FIBER" as shown in the captured photo below. The fiber type was of multimode 62.5 micron. 
The "FAT FIBER" error message was actually a very high loss splicing loss. Using power meter & light source the final loss was measured more than 15dB for a short multimode fiber optics distance of 100 meters. A visual fiber optics fault locator was used to verify the high loss which can been seen clearly at the splicing point between fiber optics pigtails and cable. The estimation given by the splicing machine is only an indication of splicing loss. To get accurate splicing loss readings,one should use OTDR.
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AuthorI have been in the field of fiber optics since early 1990s. I gained fiber optics skills and knowledge via my working experience as end-user, main contractor and sub-contractor and finally as an optical fiber enterpreneur. Archives
January 2017
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