Fiber Optic Y Connection Question

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Discussion Overview

The discussion revolves around the feasibility of creating a Y-shaped connection using fiber optic wires, specifically exploring the possibility of splicing multiple fibers together for effective transmission. The scope includes theoretical considerations, practical challenges, and potential applications in fiber laser configurations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the possibility of a loss-less Y-shaped splice from two fibers into a third, noting limitations with double-clad and single-mode fibers.
  • Another participant suggests that while a 3-way fusion splice is theoretically possible, it may not be practically achievable without significant challenges.
  • A follow-up inquiry raises the need for proper alignment of fiber angles and crystal lattices at the splice points.
  • One participant asserts that such splices are not feasible for individual construction but are commonly used in passive optical networks like Verizon's FIOS.
  • A speculative idea is presented about using a liquid with a matching refractive index to create a junction, involving a Y-shaped cavity and the insertion of fibers submerged in the liquid.
  • Another participant mentions that index matching gels are used for splicing, but notes that splitters and combiners present different challenges.

Areas of Agreement / Disagreement

Participants express differing views on the practicality of creating a Y-shaped splice, with some suggesting it is theoretically possible while others emphasize the practical difficulties. No consensus is reached on the feasibility of the proposed methods.

Contextual Notes

Participants highlight various assumptions regarding the alignment of fibers and the conditions under which splicing might work, indicating that practical implementation may depend on specific technical details that remain unresolved.

Physt
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Is it possible to have a fiber optic wire spliced onto another (or starting from 3 separate fibers) to form a Y shape and have loss-less (or close thereto, as good as a normal splice) transmission from 2 of the fibers into the third? I know this wouldn't work for double-clad fiber or for single-mode fiber - but I'm wondering if setting a bunch of fiber lasers in a binary tree configuration to increase output power would be more practical than building a fiber disk laser (in terms of ease of the build, since a disk laser cavity requires some pretty precise mechanical tuning).
 
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So you are asking if you can do a 3-way fusion splice?

I would say theoretically yes, practically no. Not easily anyway.

Claude.
 
Claude Bile said:
So you are asking if you can do a 3-way fusion splice?

I would say theoretically yes, practically no. Not easily anyway.

Claude.

I'm guessing you would need to align the angles correctly, but would a 3-way fusion splice require the fibers to have the crystal lattices of their tips aligned as well, or just the angles?
 
You would not be able to build this yourself, but they are deployed in great volumes in passive optical networks (such as Verizon's FIOS).
 
the_emi_guy said:
You would not be able to build this yourself, but they are deployed in great volumes in passive optical networks (such as Verizon's FIOS).

I just had a thought, and might be incredibly wrong, but if not:

Could you use a liquid with the same refraction index as the doped fiber to create the junction?

I'm considering if you were to machine out a Y-shaped cavity with 3 holes, placed 2 fibers inside then filled with a similar refractive index fluid, then inserted the third fiber (perhaps submersed to prevent air bubbles).
 
Index matching gels or "optical gels" are routinely used for splicing fibers. Splitters and combiners is a whole different situation.
 

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