QUESTION: Do you have a process for making double-clad fibers?
ANSWER:
Yes. In addition to providing process information on the Halide system, we can also provide process information on preform fabrication, stretching and sleeving operations, preform shaping,...
QUESTION: Do you provide process information for running the Halide system?
ANSWER:
Yes, we will provide the process information and instruction required to prepare a batch of anhydrous rare earth chloride, and a typical process recipe for an industry standard Yb...
QUESTION: What about OH incorporation, background loss?
ANSWER:
The OH incorporation in the core glass is typically about ¼ of a PPM which will give a water peak at 1380 nm of approximately 15 dB/km. The background loss of the fiber in the windows where the rare...
QUESTION: How do you control the concentrations of the various dopants?
ANSWER:
Concentrations of the dopants used in the Halide system are controlled using gas flow rates as well as temperature, just as is done with the standard MCVD system.
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QUESTION: How do these fibers perform with respect to photo-darkening?
ANSWER:
Photo-darkening of Yb doped fibers depends not only on the doping process used but also on the composition of the fiber. We offer a photo-darkening preform recipe to be used with the...
QUESTION: What kind of laser or amplifier performance can be expected from fibers made with the Halide Process?
ANSWER:
For Er doped fiber used in EDFA’s pumped at 1480 nm, efficiencies of ≈ 69% with optical gain of ≈ 35 dB have been demonstrated at 1550 nm....
QUESTION: Which rare earths can be deposited by Halide process?
ANSWER:
Rare earth elements that have been demonstrated are Ytterbium, Erbium, Thulium, Holmium, Neodymium and Cerium. Since most of the elements in the Lanthanide series exhibit identical chemical...
QUESTION: Can we prepare multi element rare earth anhydrous boats?
ANSWER:
Yes. This can be done by mixing the precursor rare earth compounds when preparing a halide batch. The most relevant application that comes to mind is the fabrication of Er/Yb doped...
QUESTION: What wt. % of rare earth is possible in the fiber?
ANSWER:
For preforms requiring high concentration, values of Tm3+ have been reported at ≈ 8.5 wt.%. This is by no means the limit of what is achievable.
Answered by AskFOC Fiber...
QUESTION: How long does the anhydrous rare earth in the quartz boat last?
ANSWER:
A charge of rare earth material will last for at least 1 week and could last as long as several weeks depending on the number of preforms produced and the rare earth concentration...
