# Fileset

[ofc_fuse.pdf](https://mdr.nims.go.jp/filesets/1a538fde-f6ff-4e2e-818b-6cc4927abca0/download)

## Creator

[TODOROKI, Shin-ichi](https://orcid.org/0000-0003-3986-1900)

## Rights

Creative Commons BY-NC Attribution-NonCommercial 4.0 International[Creative Commons BY-NC Attribution-NonCommercial 4.0 International](https://creativecommons.org/licenses/by-nc/4.0/)

## Other metadata

[Quantitative Evaluation of Fiber Fuse Initiation Probability in Typical Single-mode Fibers](https://mdr.nims.go.jp/datasets/e4c80e01-d91d-4d22-8536-c7fa6cff27a7)

## Fulltext

W2A.33 OFC 2015Quantitative evaluation of fiber fuse initiationprobability in typical single-mode fibers Shin-ichi TODOROKIA b s t r a c t5.5W@1480nm five-second-longlight irradiation through a SMF-28e+ fiber on a highly Co-dopedborosilicate glass surface gave10% probability of fiber fuse initia-tion. This method is useful to eval-uate relative fiber fuse tolerancefor various fibers.C o n c l u s i o n sMethod An adaptive glass melt absorber helps toevaluate relative probability of fiber fuse initiation.Results Initiation was enhanced by MFD reduc-tion but not by external heating.Discussion Confinement of heated area pro-motes fiber fuse initiation.F A QQ: Can we use 5 W light w/o anyfiber fuse initiation?A: No!!!Metal with 1+ W light brings aboutinitiation but it’s hard to evaluatethe probability quantitatively.BackgroundOnly two qualitative studies before [1,2]We should normalize• geometry btw fiber & heat source• irradiation time & powerMethod Heat source (Absorber)Geometry ProbabilityInevitable gap ⇒Small8Metal:Highly Co-dopedborosilicateglass∗: ,Adaptive ⇒ Measurable* Cobalt-6 #516 (Glass Alchemy)Method Reproducible positioningHolderFiberlaser FiberholderXY-stageOptical fiberPC1480 nmAbsorberMethod Initiation procedureOpticalfiberAbsorber• Position the absorberw/ minimum tension• Shift it away &Let the laser ON• Shift it back to melt itbefore the contact.• The melt expands &wraps the fiber tip.• Stop the laser 5 s later.• Remove the fiber w/the aid of spot heating.Watch @youtu.be/wmM5JLUbf4wResults MFD dependence025507510002550751000255075100(a) TrueWave RSMFD: 8.4±0.6 µm59 trials(b) LEAF9.6±0.4 µm94 trials(e) SMF−28e+10.4±0.5 µm74 trials4.5 5.0 5.5 6.0Power (W)Initiation probability (%)RTDiscussion Initiation probability• MFD reduction promotedinitiation with lower power.• However, external heating did notbecause it disturbsthermal confinement at the core.Method Reaction zoneInitiated FailedReference[1] D.D.Davis et al., SPIE 2714 202–210 (1996)[2] S. Yanagi et al., Electron. Lett. 38 977–978(2002)Results Temp. dependence• 10 trials at least• 20 trials if initiated• If initiated 4 times,continue it to get10 initiated samples.× Failed• Initiated025507510002550751000255075100(c) 550 °C39 trials(d) 300 °C67 trials(e) RT74 trials4.5 5.0 5.5 6.0Power (W)  Initiation probability (%)SMF−28e+Method How to heat the fiber tipHeater• w/ a micro ceramicheater (5×5×1.7 mm)• It slides along the fiberif the absorber comes.Discussion Reason for failuresPoor confinement of• Heated area• Plasma / Optical dischargeNamely, dissipation > absorptionfrom / in the coreResults Time for initiation• Minimum: 0.18 sec• Average: 2.40 sec (62 samples)No apparent trend with the variation ofMFD & temperature.