Determine the intended application and frequency of use for the fusion splicer. However, with numerous options available in the market, choosing the right fusion splicer can be a. A fusion splicer is a device that joins two optical fibers end-to-end by melting them together using an electric arc. The goal is to create a splice with minimal optical loss and reflection, ensuring seamless light transmission through the joint. Splicers are commonly used in: Core vs. Here's how it works step by step: 1. Fusion splicers are essential for creating low-loss, high-performance fiber optic connections in telecom, FTTH, and data center applications.