Fiber Optic Splitter Disassembly

Disassembling a fiber optic splitter requires careful handling to avoid damaging the delicate fibers and internal optical components.

Understanding the Splitter Types

Fiber optic splitters are passive optical devices that divide an input optical signal into multiple outputs. There are two main types:

• Fused Biconical Taper (FBT) Splitters: Made by fusing and tapering two fibers together, typically enclosed in a protective metal or plastic tube. Common for small split ratios like 1×2 or 1×4 .
• Planar Lightwave Circuit (PLC) Splitters: Fabricated on a quartz substrate using lithography, suitable for larger split ratios (1×8, 1×16, 1×32). They are more sensitive to handling and usually encased in a compact module .

Tools and Precautions

• Tools: Precision screwdrivers, fiber strippers, tweezers, magnifying glass, and a clean workspace.
• Precautions:
  • Always wear eye protection; fiber shards can be hazardous.
  • Avoid bending fibers beyond their minimum bend radius.
  • Work in a dust-free environment to prevent contamination.
  • Handle the splitter module gently to prevent cracking the substrate (PLC) or breaking fused fibers (FBT).

Disassembly Steps (General Guidelines)

1. Identify the Splitter Type: Check if it is PLC or FBT. PLC splitters are usually in a rectangular module, while FBT splitters are cylindrical.
2. Remove the Outer Housing: Carefully pry open the plastic or metal casing. For PLC splitters, some modules are glued, so gentle heating may soften the adhesive.
3. Expose the Internal Fibers: Once the casing is removed, locate the input and output fibers. Avoid pulling on the fibers directly.
4. Separate the Fibers:
   • For FBT splitters, the fused section is extremely fragile. Do not attempt to separate the fused fibers; instead, inspect or test the fibers outside the enclosure.
   • For PLC splitters, the waveguide substrate is delicate. Avoid touching the glass surface; use tweezers to handle fibers.
5. Label and Document: If you plan to reassemble, label each fiber and document the connections to maintain the correct split configuration.

Testing and Reassembly

• After disassembly, inspect fibers for microbends, cracks, or contamination.
• Clean fibers with isopropyl alcohol and lint-free wipes.
• Reassemble the housing carefully, ensuring fibers are not stressed or bent sharply.

Important Notes

• Disassembly is generally not recommended for PLC splitters due to their delicate internal structure; they are designed to be maintenance-free.
• FBT splitters can sometimes be opened for inspection, but the fused section cannot be separated without destroying the splitter.
• Always follow industry standards such as ITU-T G.671 and Telcordia GR-1209/GR-1221 for handling and testing optical components . By following these guidelines, you can safely inspect or troubleshoot a fiber optic splitter without compromising its performance.